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author | tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2008-10-26 11:54:33 +0000 |
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committer | tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2008-10-26 11:54:33 +0000 |
commit | d6770dd47dcb871f021868dec2b333527ffb8ee8 (patch) | |
tree | 7357a6c430fc75761ca4ecb7df0f249efba6438e /src/base | |
parent | 831c09280154452be3520b0d0d2987a2e405e419 (diff) | |
download | usdx-d6770dd47dcb871f021868dec2b333527ffb8ee8.tar.gz usdx-d6770dd47dcb871f021868dec2b333527ffb8ee8.tar.xz usdx-d6770dd47dcb871f021868dec2b333527ffb8ee8.zip |
git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@1479 b956fd51-792f-4845-bead-9b4dfca2ff2c
Diffstat (limited to '')
-rw-r--r-- | src/base/UFont.pas | 5326 |
1 files changed, 2689 insertions, 2637 deletions
diff --git a/src/base/UFont.pas b/src/base/UFont.pas index 947a1c6f..30be4c3b 100644 --- a/src/base/UFont.pas +++ b/src/base/UFont.pas @@ -1,2646 +1,2698 @@ -unit UFont;
-
-{$IFDEF FPC}
- {$mode delphi}{$H+}
-{$ENDIF}
-
-{$DEFINE HasInline}
-
-interface
-
-// Flip direction of y-axis.
-// Default is a cartesian coordinate system with y-axis in upper direction
-// but with USDX the y-axis is in lower direction.
-{$DEFINE FLIP_YAXIS}
-{$DEFINE BITMAP_FONT}
-
-uses
- FreeType,
- gl,
- glext,
- glu,
- sdl,
- {$IFDEF BITMAP_FONT}
- UTexture,
- {$ENDIF}
- Math,
- Classes,
- SysUtils;
-
-type
-
- PGLubyteArray = ^TGLubyteArray;
- TGLubyteArray = array[0 .. (MaxInt div SizeOf(GLubyte))-1] of GLubyte;
- TGLubyteDynArray = array of GLubyte;
-
- TWideStringArray = array of WideString;
-
- TGLColor = packed record
- case byte of
- 0: ( vals: array[0..3] of GLfloat; );
- 1: ( r, g, b, a: GLfloat; );
- end;
-
- TBoundsDbl = record
- Left, Right: double;
- Bottom, Top: double;
- end;
-
- TPositionDbl = record
- X, Y: double;
- end;
-
- TTextureSize = record
- Width, Height: integer;
- end;
-
- TBitmapCoords = record
- Left, Top: double;
- Width, Height: integer;
- end;
-
- {**
- * Abstract base class representing a glyph.
- *}
- TGlyph = class
- protected
- function GetAdvance(): TPositionDbl; virtual; abstract;
- function GetBounds(): TBoundsDbl; virtual; abstract;
- public
- procedure Render(UseDisplayLists: boolean); virtual; abstract;
- procedure RenderReflection(); virtual; abstract;
-
- {** Distance to next glyph (in pixels) *}
- property Advance: TPositionDbl read GetAdvance;
- {** Glyph bounding box (in pixels) *}
- property Bounds: TBoundsDbl read GetBounds;
- end;
-
- {**
- * Font styles used by TFont.Style
- *}
- TFontStyle = set of (Italic, Underline, Reflect);
-
- {**
- * Base font class.
- *}
- TFont = class
- private
- {** Non-virtual reset-method used in Create() and Reset() }
- procedure ResetIntern();
-
- protected
- fStyle: TFontStyle;
- fUseKerning: boolean;
- fLineSpacing: single; // must be inited by subclass
- fReflectionSpacing: single; // must be inited by subclass to -2*Descender
- fGlyphSpacing: single;
- fReflectionPass: boolean;
-
- {**
- * Splits lines in Text seperated by newline (char-code #13).
- * @param Text UTF-8 encoded string
- * @param Lines splitted WideString lines
- *}
- procedure SplitLines(const Text: UTF8String; var Lines: TWideStringArray);
-
- {**
- * Print an array of WideStrings. Each array-item is a line of text.
- * Lines of text are seperated by the line-spacing.
- * This is the base function for all text drawing.
- *}
- procedure Print(const Text: TWideStringArray); overload; virtual;
-
- {**
+{* UltraStar Deluxe - Karaoke Game + * + * UltraStar Deluxe is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + * $URL$ + * $Id$ + *} + +unit UFont; + +{$IFDEF FPC} + {$MODE Delphi} +{$ENDIF} + +{$I switches.inc} + +interface + +{$IFNDEF FREETYPE_DEMO} + // Flip direction of y-axis. + // Default is a cartesian coordinate system with y-axis in upper direction + // but with USDX the y-axis is in lower direction. + {$DEFINE FLIP_YAXIS} + {$DEFINE BITMAP_FONT} +{$ENDIF} + +uses + FreeType, + gl, + glext, + glu, + sdl, + {$IFDEF BITMAP_FONT} + UTexture, + {$ENDIF} + Math, + Classes, + SysUtils; + +type + + PGLubyteArray = ^TGLubyteArray; + TGLubyteArray = array[0 .. (MaxInt div SizeOf(GLubyte))-1] of GLubyte; + TGLubyteDynArray = array of GLubyte; + + TWideStringArray = array of WideString; + + TGLColor = packed record + case byte of + 0: ( vals: array[0..3] of GLfloat; ); + 1: ( r, g, b, a: GLfloat; ); + end; + + TBoundsDbl = record + Left, Right: double; + Bottom, Top: double; + end; + + TPositionDbl = record + X, Y: double; + end; + + TTextureSize = record + Width, Height: integer; + end; + + TBitmapCoords = record + Left, Top: double; + Width, Height: integer; + end; + + {** + * Abstract base class representing a glyph. + *} + TGlyph = class + protected + function GetAdvance(): TPositionDbl; virtual; abstract; + function GetBounds(): TBoundsDbl; virtual; abstract; + public + procedure Render(UseDisplayLists: boolean); virtual; abstract; + procedure RenderReflection(); virtual; abstract; + + {** Distance to next glyph (in pixels) *} + property Advance: TPositionDbl read GetAdvance; + {** Glyph bounding box (in pixels) *} + property Bounds: TBoundsDbl read GetBounds; + end; + + {** + * Font styles used by TFont.Style + *} + TFontStyle = set of (Italic, Underline, Reflect); + + {** + * Base font class. + *} + TFont = class + private + {** Non-virtual reset-method used in Create() and Reset() } + procedure ResetIntern(); + + protected + fStyle: TFontStyle; + fUseKerning: boolean; + fLineSpacing: single; // must be inited by subclass + fReflectionSpacing: single; // must be inited by subclass to -2*Descender + fGlyphSpacing: single; + fReflectionPass: boolean; + + {** + * Splits lines in Text seperated by newline (char-code #13). + * @param Text UTF-8 encoded string + * @param Lines splitted WideString lines + *} + procedure SplitLines(const Text: UTF8String; var Lines: TWideStringArray); + + {** + * Print an array of WideStrings. Each array-item is a line of text. + * Lines of text are seperated by the line-spacing. + * This is the base function for all text drawing. + *} + procedure Print(const Text: TWideStringArray); overload; virtual; + + {** * Draws an underline. *} - procedure DrawUnderline(const Text: WideString); virtual;
-
- {**
- * Renders (one) line of text.
- *}
- procedure Render(const Text: WideString); virtual; abstract;
-
- {**
- * Returns the bounds of text-lines contained in Text.
- * @param(Advance if true the right bound is set to the advance instead
- * of the minimal right bound.)
- *}
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; overload; virtual; abstract;
-
- {**
- * Resets all user settings to default values.
- * Override methods should always call the inherited version.
- *}
- procedure Reset(); virtual;
-
- function GetHeight(): single; virtual; abstract;
- function GetAscender(): single; virtual; abstract;
- function GetDescender(): single; virtual; abstract;
- procedure SetLineSpacing(Spacing: single); virtual;
- function GetLineSpacing(): single; virtual;
- procedure SetGlyphSpacing(Spacing: single); virtual;
- function GetGlyphSpacing(): single; virtual;
- procedure SetReflectionSpacing(Spacing: single); virtual;
- function GetReflectionSpacing(): single; virtual;
- procedure SetStyle(Style: TFontStyle); virtual;
- function GetStyle(): TFontStyle; virtual;
- function GetUnderlinePosition(): single; virtual; abstract;
- function GetUnderlineThickness(): single; virtual; abstract;
- procedure SetUseKerning(Enable: boolean); virtual;
- function GetUseKerning(): boolean; virtual;
- procedure SetReflectionPass(Enable: boolean); virtual;
-
- {** Returns true if the current render-pass is used to draw the reflection }
- property ReflectionPass: boolean read fReflectionPass write SetReflectionPass;
-
- public
- constructor Create();
- destructor Destroy(); override;
-
- {**
- * Prints a text.
- *}
- procedure Print(const Text: WideString); overload;
- {** UTF-8 version of @link(Print) }
- procedure Print(const Text: string); overload;
-
- {**
- * Calculates the bounding box (width and height) around Text.
- * Works with Italic and Underline styles but reflections created
- * with the Reflect style are not considered.
- * Note that the width might differ due to kerning with appended text,
- * e.g. Width('VA') <= Width('V') + Width('A').
- * @param Advance if set to true, Result.Right is set to the advance of
- * the given text rather than the min. right border. The advance width is
- * bigger than the text's width as it additionally contains the advance
- * and glyph-spacing of the last character.
- *}
- function BBox(const Text: WideString; Advance: boolean = false): TBoundsDbl; overload;
- {** UTF-8 version of @link(BBox) }
- function BBox(const Text: UTF8String; Advance: boolean = false): TBoundsDbl; overload;
-
- {** Font height }
- property Height: single read GetHeight;
- {** Vertical distance from baseline to top of glyph }
- property Ascender: single read GetAscender;
- {** Vertical distance from baseline to bottom of glyph }
- property Descender: single read GetDescender;
- {** Vertical distance between two baselines }
- property LineSpacing: single read GetLineSpacing write SetLineSpacing;
- {** Space between end and start of next glyph added to the advance width }
- property GlyphSpacing: single read GetGlyphSpacing write SetGlyphSpacing;
- {** Distance between normal baseline and baseline of the reflection }
- property ReflectionSpacing: single read GetReflectionSpacing write SetReflectionSpacing;
- {** Font style (italic/underline/...) }
- property Style: TFontStyle read GetStyle write SetStyle;
- {** If set to true (default) kerning will be used if available }
- property UseKerning: boolean read GetUseKerning write SetUseKerning;
- end;
-
-const
- //** Max. number of mipmap levels that a TScalableFont can contain
- cMaxMipmapLevel = 5;
-
-type
- {**
- * Wrapper around TFont to allow font size changes.
- * The font is scaled to the requested size by a modelview matrix
- * transformation (glScale) and not by rescaling the internal bitmap
- * representation. This way changing the size is really fast but the result
- * may lack quality on large or small scale factors.
- *}
- TScalableFont = class(TFont)
- private
- procedure ResetIntern();
-
- protected
- fScale: single; //**< current height to base-font height ratio
- fAspect: single; //**< width to height aspect
- fBaseFont: TFont; //**< shortcut for fMipmapFonts[0]
- fUseMipmaps: boolean; //**< true if mipmap fonts are generated
- /// Mipmap fonts (size[level+1] = size[level]/2)
- fMipmapFonts: array[0..cMaxMipmapLevel] of TFont;
-
- procedure Render(const Text: WideString); override;
- procedure Print(const Text: TWideStringArray); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- {**
- * Callback called for creation of each mipmap font.
- * Must be defined by the subclass.
- * Mipmaps created by this method are managed and freed by TScalableFont.
- *}
- function CreateMipmap(Level: integer; Scale: single): TFont; virtual; abstract;
-
- {**
- * Returns the mipmap level considering the current scale and projection
- * matrix.
- *}
- function GetMipmapLevel(): integer;
-
- {**
- * Returns the scale applied to the given mipmap font.
- * fScale * fBaseFont.Height / fMipmapFont[Level].Height
- *}
- function GetMipmapScale(Level: integer): single;
-
- {**
- * Chooses the mipmap that looks nicest with current scale and projection
- * matrix.
- *}
- function ChooseMipmapFont(): TFont;
-
- procedure SetHeight(Height: single); virtual;
- function GetHeight(): single; override;
- procedure SetAspect(Aspect: single); virtual;
- function GetAspect(): single; virtual;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- procedure SetLineSpacing(Spacing: single); override;
- function GetLineSpacing(): single; override;
- procedure SetGlyphSpacing(Spacing: single); override;
- function GetGlyphSpacing(): single; override;
- procedure SetReflectionSpacing(Spacing: single); override;
- function GetReflectionSpacing(): single; override;
- procedure SetStyle(Style: TFontStyle); override;
- function GetStyle(): TFontStyle; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
- procedure SetUseKerning(Enable: boolean); override;
-
- public
- {**
- * Creates a wrapper to make the base-font Font scalable.
- * If UseMipmaps is set to true smaller fonts are created so that a
- * resized (Height property changed) font looks nicer.
- * The font passed is managed and freed by TScalableFont.
- *}
- constructor Create(Font: TFont; UseMipmaps: boolean); overload;
-
- {**
- * Frees memory. The fonts passed on Create() and mipmap creation
- * are freed too.
- *}
- destructor Destroy(); override;
-
- {** @seealso TFont.Reset }
- procedure Reset(); override;
-
- {** Font height }
- property Height: single read GetHeight write SetHeight;
- {** Factor for font stretching (NewWidth = Width*Aspect), 1.0 by default }
- property Aspect: single read GetAspect write SetAspect;
- end;
-
- {**
- * Table for storage of max. 256 glyphs.
- * Used for the second cache level. Indexed by the LSB of the WideChar
- * char-code.
- *}
- PGlyphTable = ^TGlyphTable;
- TGlyphTable = array[0..255] of TGlyph;
-
- {**
- * Cache for glyphs of a single font.
- * The cached glyphs are stored inside a hash-list.
- * Hashing is performed in two steps:
- * 1. the least significant byte (LSB) of the WideChar character code
- * is removed (shr 8) and the result (we call it BaseCode here) looked up in
- * the hash-list.
- * 2. Each entry of the hash-list contains a table with max. 256 entries.
- * The LSB of the char-code of a glyph is the table-offset of that glyph.
- *}
- TGlyphCache = class
- private
- fHash: TList;
-
- {**
- * Finds a glyph-table storing cached glyphs with base-code BaseCode
- * (= upper char-code bytes) in the hash-list and returns the table and
- * its index.
- * @param(InsertPos the position of the tyble in the list if it was found,
- * otherwise the position the table should be inserted)
- *}
- function FindGlyphTable(BaseCode: cardinal; out InsertPos: integer): PGlyphTable;
-
- public
- constructor Create();
- destructor Destroy(); override;
-
- {**
- * Add glyph Glyph with char-code ch to the cache.
- * @returns @true on success, @false otherwise
- *}
- function AddGlyph(ch: WideChar; const Glyph: TGlyph): boolean;
-
- {**
- * Removes the glyph with char-code ch from the cache.
- *}
- procedure DeleteGlyph(ch: WideChar);
-
- {**
- * Removes the glyph with char-code ch from the cache.
- *}
- function GetGlyph(ch: WideChar): TGlyph;
-
- {**
- * Checks if a glyph with char-code ch is cached.
- *}
- function HasGlyph(ch: WideChar): boolean;
-
- {**
- * Remove and free all cached glyphs. If KeepBaseSet is set to
- * true, cached characters in the range 0..255 will not be flushed.
- *}
- procedure FlushCache(KeepBaseSet: boolean);
- end;
-
- {**
- * Entry of a glyph-cache's (TGlyphCache) hash.
- * Stores a BaseCode (upper-bytes of a glyph's char-code) and a table
- * with all glyphs cached at the moment with that BaseCode.
- *}
- TGlyphCacheHashEntry = class
- private
- fBaseCode: cardinal;
- public
- GlyphTable: TGlyphTable;
-
- constructor Create(BaseCode: cardinal);
-
- {** Base-code (upper-bytes) of the glyphs stored in this entry's table }
- property BaseCode: cardinal read fBaseCode;
- end;
-
- TCachedFont = class(TFont)
- protected
- fCache: TGlyphCache;
-
- {**
- * Retrieves a cached glyph with char-code ch from cache.
- * If the glyph is not already cached, it is loaded with LoadGlyph().
- *}
- function GetGlyph(ch: WideChar): TGlyph;
-
- {**
- * Callback to create (load) a glyph with char-code ch.
- * Implemented by subclasses.
- *}
- function LoadGlyph(ch: WideChar): TGlyph; virtual; abstract;
-
- public
- constructor Create();
- destructor Destroy(); override;
-
- {**
- * Remove and free all cached glyphs. If KeepBaseSet is set to
- * true, the base glyphs are not be flushed.
- * @seealso TGlyphCache.FlushCache
- *}
- procedure FlushCache(KeepBaseSet: boolean);
- end;
-
- TFTFont = class;
-
- {**
- * Freetype glyph.
- * Each glyph stores a texture with the glyph's image.
- *}
- TFTGlyph = class(TGlyph)
- private
- fCharIndex: FT_UInt; //**< Freetype specific char-index (<> char-code)
- fDisplayList: GLuint; //**< Display-list ID
- fTexture: GLuint; //**< Texture ID
- fBitmapCoords: TBitmapCoords; //**< Left/Top offset and Width/Height of the bitmap (in pixels)
- fTexOffset: TPositionDbl; //**< Right and bottom texture offset for removal of power-of-2 padding
- fTexSize: TTextureSize; //**< Texture size in pixels
-
- fFont: TFTFont; //**< Font associated with this glyph
- fAdvance: TPositionDbl; //**< Advance width of this glyph
- fBounds: TBoundsDbl; //**< Glyph bounds
- fOutset: single; //**< Extrusion outset
-
- {**
- * Extrudes the outline of a glyph's bitmap stored in TexBuffer with size
- * fTexSize by Outset pixels.
- * This is useful to create bold or outlined fonts.
- * TexBuffer must be 2*Ceil(Outset) pixels higher and wider than the
- * original glyph bitmap, otherwise the glyph borders cannot be extruded
- * correctly.
- * The bitmap must be 2* pixels wider and higher than the
- * original glyph's bitmap with the latter centered in it.
- *}
- procedure Extrude(var TexBuffer: TGLubyteDynArray; Outset: single);
-
- {**
- * Creates an OpenGL texture (and display list) for the glyph.
- * The glyph's and bitmap's metrics are set correspondingly.
- * @param LoadFlags flags passed to FT_Load_Glyph()
- * @raises Exception if the glyph could not be initialized
- *}
- procedure CreateTexture(LoadFlags: FT_Int32);
-
- protected
- function GetAdvance(): TPositionDbl; override;
- function GetBounds(): TBoundsDbl; override;
-
- public
- {**
- * Creates a glyph with char-code ch from font Font.
- * @param LoadFlags flags passed to FT_Load_Glyph()
- *}
- constructor Create(Font: TFTFont; ch: WideChar; Outset: single;
- LoadFlags: FT_Int32);
- destructor Destroy(); override;
-
- {** Renders the glyph (normal render pass) }
- procedure Render(UseDisplayLists: boolean); override;
- {** Renders the glyph's reflection }
- procedure RenderReflection(); override;
-
- {** Freetype specific char-index (<> char-code) }
- property CharIndex: FT_UInt read fCharIndex;
- end;
-
- {**
- * Freetype font class.
- *}
- TFTFont = class(TCachedFont)
- private
- procedure ResetIntern();
-
- protected
- fFilename: string; //**< filename of the font-file
- fSize: integer; //**< Font base size (in pixels)
- fOutset: single; //**< size of outset extrusion (in pixels)
- fFace: FT_Face; //**< Holds the height of the font
- fLoadFlags: FT_Int32; //**< FT glpyh load-flags
- fFontUnitScale: TPositionDbl; //**< FT font-units to pixel ratio
- fUseDisplayLists: boolean; //**< true: use display-lists, false: direct drawing
-
- {** @seealso TCachedFont.LoadGlyph }
- function LoadGlyph(ch: WideChar): TGlyph; override;
-
- procedure Render(const Text: WideString); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- function GetHeight(): single; override;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
-
- property Face: FT_Face read fFace;
-
- public
- {**
- * Creates a font of size Size (in pixels) from the file Filename.
- * If Outset (in pixels) is set to a value > 0 the glyphs will be extruded
- * at their borders. Use it for e.g. a bold effect.
- * @param LoadFlags flags passed to FT_Load_Glyph()
- * @raises Exception if the font-file could not be loaded
- *}
- constructor Create(const Filename: string;
- Size: integer; Outset: single = 0.0;
- LoadFlags: FT_Int32 = FT_LOAD_DEFAULT);
-
- {**
- * Frees all resources associated with the font.
- *}
- destructor Destroy(); override;
-
- {** @seealso TFont.Reset }
- procedure Reset(); override;
-
- {** Size of the base font }
- property Size: integer read fSize;
- {** Outset size }
- property Outset: single read fOutset;
- end;
-
- TFTScalableFont = class(TScalableFont)
- protected
- function GetOutset(): single; virtual;
- function CreateMipmap(Level: integer; Scale: single): TFont; override;
-
- public
- {**
- * Creates a scalable font of size Size (in pixels) from the file Filename.
- * OutsetAmount is the ratio of the glyph extrusion.
- * The extrusion in pixels is Size*OutsetAmount
- * (0.0 -> no extrusion, 0.1 -> 10%).
- *}
- constructor Create(const Filename: string;
- Size: integer; OutsetAmount: single = 0.0;
- UseMipmaps: boolean = true);
-
- {** @seealso TGlyphCache.FlushCache }
- procedure FlushCache(KeepBaseSet: boolean);
-
- {** Outset size (in pixels) of the scaled font }
- property Outset: single read GetOutset;
- end;
-
-
- {**
- * Represents a freetype font with an additional outline around its glyphs.
- * The outline size is passed on creation and cannot be changed later.
- *}
- TFTOutlineFont = class(TFont)
- private
- fFilename: string;
- fSize: integer;
- fOutset: single;
- fInnerFont, fOutlineFont: TFTFont;
- fOutlineColor: TGLColor;
-
- procedure ResetIntern();
-
- protected
- procedure DrawUnderline(const Text: WideString); override;
- procedure Render(const Text: WideString); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- function GetHeight(): single; override;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- procedure SetLineSpacing(Spacing: single); override;
- procedure SetGlyphSpacing(Spacing: single); override;
- procedure SetReflectionSpacing(Spacing: single); override;
- procedure SetStyle(Style: TFontStyle); override;
- function GetStyle(): TFontStyle; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
- procedure SetUseKerning(Enable: boolean); override;
- procedure SetReflectionPass(Enable: boolean); override;
-
- public
- constructor Create(const Filename: string;
- Size: integer; Outset: single;
- LoadFlags: FT_Int32 = FT_LOAD_DEFAULT);
- destructor Destroy; override;
-
- {** Sets the color of the outline }
- procedure SetOutlineColor(r, g, b: GLfloat; a: GLfloat = 1.0);
-
- {** @seealso TGlyphCache.FlushCache }
- procedure FlushCache(KeepBaseSet: boolean);
-
- {** @seealso TFont.Reset }
- procedure Reset(); override;
-
- {** Size of the base font }
- property Size: integer read fSize;
- {** Outset size }
- property Outset: single read fOutset;
- end;
-
- {**
- * Wrapper around TOutlineFont to allow font resizing.
- * @seealso TScalableFont
- *}
- TFTScalableOutlineFont = class(TScalableFont)
- protected
- function GetOutset(): single; virtual;
- function CreateMipmap(Level: integer; Scale: single): TFont; override;
-
- public
- constructor Create(const Filename: string;
- Size: integer; OutsetAmount: single;
- UseMipmaps: boolean = true);
-
- {** Sets the color of the outline }
- procedure SetOutlineColor(r, g, b: GLfloat; a: GLfloat = 1.0);
-
- {** @seealso TGlyphCache.FlushCache }
- procedure FlushCache(KeepBaseSet: boolean);
-
- {** Outset size }
- property Outset: single read GetOutset;
- end;
-
-{$IFDEF BITMAP_FONT}
-
- {**
- * A bitmapped font loads it's glyphs from a bitmap and stores them in a
- * texture. Unicode characters are not supported (but could be by supporting
- * multiple textures each storing a subset of unicode glyphs).
- * For backward compatibility only.
- *}
- TBitmapFont = class(TFont)
- private
- fTex: TTexture;
- fTexSize: integer;
- fBaseline: integer;
- fAscender: integer;
- fDescender: integer;
- fWidths: array[0..255] of byte; //**< half widths
- fOutline: integer;
- fTempColor: TGLColor; //**< colours for the reflection
-
- procedure ResetIntern();
-
- procedure RenderChar(ch: WideChar; var AdvanceX: real);
-
- {**
- * Load font widths from an info file.
- * @param InfoFile the name of the info (.dat) file
- * @raises Exception if the file is corrupted
- *}
- procedure LoadFontInfo(const InfoFile: string);
-
- protected
- procedure Render(const Text: WideString); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- function GetHeight(): single; override;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
-
- public
- {**
- * Creates a bitmapped font from image Filename and font width info
- * loaded from the corresponding file with ending .dat.
- * @param(Baseline y-coord of the baseline given in cartesian coords
- * (y-axis up) and from the lower edge of the glyphs bounding box)
- * @param(Ascender pixels from baseline to top of highest glyph)
- *}
- constructor Create(const Filename: string; Outline: integer;
- Baseline, Ascender, Descender: integer);
- destructor Destroy(); override;
-
- {**
- * Corrects font widths provided by the info file.
- * NewWidth := Width * WidthMult + WidthAdd
- *}
- procedure CorrectWidths(WidthMult: real; WidthAdd: integer);
-
- {** @seealso TFont.Reset }
- procedure Reset(); override;
- end;
-
-{$ENDIF BITMAP_FONT}
-
- TFreeType = class
- public
- {**
- * Returns a pointer to the freetype library singleton.
- * If non exists, freetype will be initialized.
- * @raises Exception if initialization failed
- *}
- class function GetLibrary(): FT_Library;
- class procedure FreeLibrary();
- end;
-
-
-implementation
-
-uses Types;
-
-const
- //** shear factor used for the italic effect (bigger value -> more bending)
- cShearFactor = 0.25;
- cShearMatrix: array[0..15] of GLfloat = (
- 1, 0, 0, 0,
- cShearFactor, 1, 0, 0,
- 0, 0, 1, 0,
- 0, 0, 0, 1
- );
- cShearMatrixInv: array[0..15] of GLfloat = (
- 1, 0, 0, 0,
- -cShearFactor, 1, 0, 0,
- 0, 0, 1, 0,
- 0, 0, 0, 1
- );
-
-var
- LibraryInst: FT_Library;
-
-function NewGLColor(r, g, b, a: GLfloat): TGLColor;
-begin
- Result.r := r;
- Result.g := g;
- Result.b := b;
- Result.a := a;
-end;
-
-{**
- * Returns the first power of 2 >= Value.
- *}
-function NextPowerOf2(Value: integer): integer; {$IFDEF HasInline}inline;{$ENDIF}
-begin
- Result := 1;
- while (Result < Value) do
- Result := Result shl 1;
-end;
-
-
-{*
- * TFont
- *}
-
-constructor TFont.Create();
-begin
- inherited;
- ResetIntern();
-end;
-
-destructor TFont.Destroy();
-begin
- inherited;
-end;
-
-procedure TFont.ResetIntern();
-begin
- fStyle := [];
- fUseKerning := true;
- fGlyphSpacing := 0.0;
- fReflectionPass := false;
-
- // must be set by subclasses
- fLineSpacing := 0.0;
- fReflectionSpacing := 0.0;
-end;
-
-procedure TFont.Reset();
-begin
- ResetIntern();
-end;
-
-procedure TFont.SplitLines(const Text: UTF8String; var Lines: TWideStringArray);
-var
- LineList: TStringList;
- LineIndex: integer;
-begin
- // split lines on newline (there is no WideString version of ExtractStrings)
- LineList := TStringList.Create();
- ExtractStrings([#13], [], PChar(Text), LineList);
-
- // create an array of WideStrins from the UTF-8 string-list
- SetLength(Lines, LineList.Count);
- for LineIndex := 0 to LineList.Count-1 do
- Lines[LineIndex] := UTF8Decode(LineList[LineIndex]);
- LineList.Free();
-end;
-
-function TFont.BBox(const Text: UTF8String; Advance: boolean): TBoundsDbl;
-var
- LineArray: TWideStringArray;
-begin
- SplitLines(Text, LineArray);
- Result := BBox(LineArray, Advance);
- SetLength(LineArray, 0);
-end;
-
-function TFont.BBox(const Text: WideString; Advance: boolean): TBoundsDbl;
-begin
- Result := BBox(UTF8Encode(Text), Advance);
-end;
-
-procedure TFont.Print(const Text: TWideStringArray);
-var
- LineIndex: integer;
-begin
- // recursively call this function to draw reflected text
- if ((Reflect in Style) and not ReflectionPass) then
- begin
- ReflectionPass := true;
- Print(Text);
- ReflectionPass := false;
- end;
-
- // store current color, enable-flags, matrix-mode
- glPushAttrib(GL_CURRENT_BIT or GL_ENABLE_BIT or GL_TRANSFORM_BIT);
-
- // set OpenGL state
- glMatrixMode(GL_MODELVIEW);
- glDisable(GL_DEPTH_TEST);
- glEnable(GL_BLEND);
- glEnable(GL_TEXTURE_2D);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
- {
- // TODO: just draw texels with alpha > 0 to avoid setting z-buffer for them?
- glAlphaFunc(GL_GREATER, 0);
- glEnable(GL_ALPHA_TEST);
-
- //TODO: Do we need depth-testing?
- if (ReflectionPass) then
- begin
- glDepthMask(0);
- glEnable(GL_DEPTH_TEST);
- end;
- }
-
- {$IFDEF FLIP_YAXIS}
- glPushMatrix();
- glScalef(1, -1, 1);
- {$ENDIF}
-
- // display text
- for LineIndex := 0 to High(Text) do
- begin
- glPushMatrix();
-
- // move to baseline
- glTranslatef(0, -LineSpacing*LineIndex, 0);
-
- if ((Underline in Style) and not ReflectionPass) then
- begin
- glDisable(GL_TEXTURE_2D);
- DrawUnderline(Text[LineIndex]);
- glEnable(GL_TEXTURE_2D);
- end;
-
- // draw reflection
- if (ReflectionPass) then
- begin
- // set reflection spacing
- glTranslatef(0, -ReflectionSpacing, 0);
- // flip y-axis
- glScalef(1, -1, 1);
- end;
-
- // shear for italic effect
- if (Italic in Style) then
- glMultMatrixf(@cShearMatrix);
-
+ procedure DrawUnderline(const Text: WideString); virtual; + + {** + * Renders (one) line of text. + *} + procedure Render(const Text: WideString); virtual; abstract; + + {** + * Returns the bounds of text-lines contained in Text. + * @param(Advance if true the right bound is set to the advance instead + * of the minimal right bound.) + *} + function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; overload; virtual; abstract; + + {** + * Resets all user settings to default values. + * Override methods should always call the inherited version. + *} + procedure Reset(); virtual; + + function GetHeight(): single; virtual; abstract; + function GetAscender(): single; virtual; abstract; + function GetDescender(): single; virtual; abstract; + procedure SetLineSpacing(Spacing: single); virtual; + function GetLineSpacing(): single; virtual; + procedure SetGlyphSpacing(Spacing: single); virtual; + function GetGlyphSpacing(): single; virtual; + procedure SetReflectionSpacing(Spacing: single); virtual; + function GetReflectionSpacing(): single; virtual; + procedure SetStyle(Style: TFontStyle); virtual; + function GetStyle(): TFontStyle; virtual; + function GetUnderlinePosition(): single; virtual; abstract; + function GetUnderlineThickness(): single; virtual; abstract; + procedure SetUseKerning(Enable: boolean); virtual; + function GetUseKerning(): boolean; virtual; + procedure SetReflectionPass(Enable: boolean); virtual; + + {** Returns true if the current render-pass is used to draw the reflection } + property ReflectionPass: boolean read fReflectionPass write SetReflectionPass; + + public + constructor Create(); + destructor Destroy(); override; + + {** + * Prints a text. + *} + procedure Print(const Text: WideString); overload; + {** UTF-8 version of @link(Print) } + procedure Print(const Text: string); overload; + + {** + * Calculates the bounding box (width and height) around Text. + * Works with Italic and Underline styles but reflections created + * with the Reflect style are not considered. + * Note that the width might differ due to kerning with appended text, + * e.g. Width('VA') <= Width('V') + Width('A'). + * @param Advance if set to true, Result.Right is set to the advance of + * the given text rather than the min. right border. The advance width is + * bigger than the text's width as it additionally contains the advance + * and glyph-spacing of the last character. + *} + function BBox(const Text: WideString; Advance: boolean = true): TBoundsDbl; overload; + {** UTF-8 version of @link(BBox) } + function BBox(const Text: UTF8String; Advance: boolean = true): TBoundsDbl; overload; + + {** Font height } + property Height: single read GetHeight; + {** Vertical distance from baseline to top of glyph } + property Ascender: single read GetAscender; + {** Vertical distance from baseline to bottom of glyph } + property Descender: single read GetDescender; + {** Vertical distance between two baselines } + property LineSpacing: single read GetLineSpacing write SetLineSpacing; + {** Space between end and start of next glyph added to the advance width } + property GlyphSpacing: single read GetGlyphSpacing write SetGlyphSpacing; + {** Distance between normal baseline and baseline of the reflection } + property ReflectionSpacing: single read GetReflectionSpacing write SetReflectionSpacing; + {** Font style (italic/underline/...) } + property Style: TFontStyle read GetStyle write SetStyle; + {** If set to true (default) kerning will be used if available } + property UseKerning: boolean read GetUseKerning write SetUseKerning; + end; + +const + //** Max. number of mipmap levels that a TScalableFont can contain + cMaxMipmapLevel = 5; + +type + {** + * Wrapper around TFont to allow font size changes. + * The font is scaled to the requested size by a modelview matrix + * transformation (glScale) and not by rescaling the internal bitmap + * representation. This way changing the size is really fast but the result + * may lack quality on large or small scale factors. + *} + TScalableFont = class(TFont) + private + procedure ResetIntern(); + + protected + fScale: single; //**< current height to base-font height ratio + fAspect: single; //**< width to height aspect + fBaseFont: TFont; //**< shortcut for fMipmapFonts[0] + fUseMipmaps: boolean; //**< true if mipmap fonts are generated + /// Mipmap fonts (size[level+1] = size[level]/2) + fMipmapFonts: array[0..cMaxMipmapLevel] of TFont; + + procedure Render(const Text: WideString); override; + procedure Print(const Text: TWideStringArray); override; + function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override; + + {** + * Callback called for creation of each mipmap font. + * Must be defined by the subclass. + * Mipmaps created by this method are managed and freed by TScalableFont. + *} + function CreateMipmap(Level: integer; Scale: single): TFont; virtual; abstract; + + {** + * Returns the mipmap level considering the current scale and projection + * matrix. + *} + function GetMipmapLevel(): integer; + + {** + * Returns the scale applied to the given mipmap font. + * fScale * fBaseFont.Height / fMipmapFont[Level].Height + *} + function GetMipmapScale(Level: integer): single; + + {** + * Chooses the mipmap that looks nicest with current scale and projection + * matrix. + *} + function ChooseMipmapFont(): TFont; + + procedure SetHeight(Height: single); virtual; + function GetHeight(): single; override; + procedure SetAspect(Aspect: single); virtual; + function GetAspect(): single; virtual; + function GetAscender(): single; override; + function GetDescender(): single; override; + procedure SetLineSpacing(Spacing: single); override; + function GetLineSpacing(): single; override; + procedure SetGlyphSpacing(Spacing: single); override; + function GetGlyphSpacing(): single; override; + procedure SetReflectionSpacing(Spacing: single); override; + function GetReflectionSpacing(): single; override; + procedure SetStyle(Style: TFontStyle); override; + function GetStyle(): TFontStyle; override; + function GetUnderlinePosition(): single; override; + function GetUnderlineThickness(): single; override; + procedure SetUseKerning(Enable: boolean); override; + + public + {** + * Creates a wrapper to make the base-font Font scalable. + * If UseMipmaps is set to true smaller fonts are created so that a + * resized (Height property changed) font looks nicer. + * The font passed is managed and freed by TScalableFont. + *} + constructor Create(Font: TFont; UseMipmaps: boolean); overload; + + {** + * Frees memory. The fonts passed on Create() and mipmap creation + * are freed too. + *} + destructor Destroy(); override; + + {** @seealso TFont.Reset } + procedure Reset(); override; + + {** Font height } + property Height: single read GetHeight write SetHeight; + {** Factor for font stretching (NewWidth = Width*Aspect), 1.0 by default } + property Aspect: single read GetAspect write SetAspect; + end; + + {** + * Table for storage of max. 256 glyphs. + * Used for the second cache level. Indexed by the LSB of the WideChar + * char-code. + *} + PGlyphTable = ^TGlyphTable; + TGlyphTable = array[0..255] of TGlyph; + + {** + * Cache for glyphs of a single font. + * The cached glyphs are stored inside a hash-list. + * Hashing is performed in two steps: + * 1. the least significant byte (LSB) of the WideChar character code + * is removed (shr 8) and the result (we call it BaseCode here) looked up in + * the hash-list. + * 2. Each entry of the hash-list contains a table with max. 256 entries. + * The LSB of the char-code of a glyph is the table-offset of that glyph. + *} + TGlyphCache = class + private + fHash: TList; + + {** + * Finds a glyph-table storing cached glyphs with base-code BaseCode + * (= upper char-code bytes) in the hash-list and returns the table and + * its index. + * @param(InsertPos the position of the tyble in the list if it was found, + * otherwise the position the table should be inserted) + *} + function FindGlyphTable(BaseCode: cardinal; out InsertPos: integer): PGlyphTable; + + public + constructor Create(); + destructor Destroy(); override; + + {** + * Add glyph Glyph with char-code ch to the cache. + * @returns @true on success, @false otherwise + *} + function AddGlyph(ch: WideChar; const Glyph: TGlyph): boolean; + + {** + * Removes the glyph with char-code ch from the cache. + *} + procedure DeleteGlyph(ch: WideChar); + + {** + * Removes the glyph with char-code ch from the cache. + *} + function GetGlyph(ch: WideChar): TGlyph; + + {** + * Checks if a glyph with char-code ch is cached. + *} + function HasGlyph(ch: WideChar): boolean; + + {** + * Remove and free all cached glyphs. If KeepBaseSet is set to + * true, cached characters in the range 0..255 will not be flushed. + *} + procedure FlushCache(KeepBaseSet: boolean); + end; + + {** + * Entry of a glyph-cache's (TGlyphCache) hash. + * Stores a BaseCode (upper-bytes of a glyph's char-code) and a table + * with all glyphs cached at the moment with that BaseCode. + *} + TGlyphCacheHashEntry = class + private + fBaseCode: cardinal; + public + GlyphTable: TGlyphTable; + + constructor Create(BaseCode: cardinal); + + {** Base-code (upper-bytes) of the glyphs stored in this entry's table } + property BaseCode: cardinal read fBaseCode; + end; + + TCachedFont = class(TFont) + protected + fCache: TGlyphCache; + + {** + * Retrieves a cached glyph with char-code ch from cache. + * If the glyph is not already cached, it is loaded with LoadGlyph(). + *} + function GetGlyph(ch: WideChar): TGlyph; + + {** + * Callback to create (load) a glyph with char-code ch. + * Implemented by subclasses. + *} + function LoadGlyph(ch: WideChar): TGlyph; virtual; abstract; + + public + constructor Create(); + destructor Destroy(); override; + + {** + * Remove and free all cached glyphs. If KeepBaseSet is set to + * true, the base glyphs are not be flushed. + * @seealso TGlyphCache.FlushCache + *} + procedure FlushCache(KeepBaseSet: boolean); + end; + + TFTFont = class; + + {** + * Freetype glyph. + * Each glyph stores a texture with the glyph's image. + *} + TFTGlyph = class(TGlyph) + private + fCharIndex: FT_UInt; //**< Freetype specific char-index (<> char-code) + fDisplayList: GLuint; //**< Display-list ID + fTexture: GLuint; //**< Texture ID + fBitmapCoords: TBitmapCoords; //**< Left/Top offset and Width/Height of the bitmap (in pixels) + fTexOffset: TPositionDbl; //**< Right and bottom texture offset for removal of power-of-2 padding + fTexSize: TTextureSize; //**< Texture size in pixels + + fFont: TFTFont; //**< Font associated with this glyph + fAdvance: TPositionDbl; //**< Advance width of this glyph + fBounds: TBoundsDbl; //**< Glyph bounds + fOutset: single; //**< Extrusion outset + + {** + * Extrudes the outline of a glyph's bitmap stored in TexBuffer with size + * fTexSize by Outset pixels. + * This is useful to create bold or outlined fonts. + * TexBuffer must be 2*Ceil(Outset) pixels higher and wider than the + * original glyph bitmap, otherwise the glyph borders cannot be extruded + * correctly. + * The bitmap must be 2* pixels wider and higher than the + * original glyph's bitmap with the latter centered in it. + *} + procedure Extrude(var TexBuffer: TGLubyteDynArray; Outset: single); + + {** + * Creates an OpenGL texture (and display list) for the glyph. + * The glyph's and bitmap's metrics are set correspondingly. + * @param LoadFlags flags passed to FT_Load_Glyph() + * @raises Exception if the glyph could not be initialized + *} + procedure CreateTexture(LoadFlags: FT_Int32); + + protected + function GetAdvance(): TPositionDbl; override; + function GetBounds(): TBoundsDbl; override; + + public + {** + * Creates a glyph with char-code ch from font Font. + * @param LoadFlags flags passed to FT_Load_Glyph() + *} + constructor Create(Font: TFTFont; ch: WideChar; Outset: single; + LoadFlags: FT_Int32); + destructor Destroy(); override; + + {** Renders the glyph (normal render pass) } + procedure Render(UseDisplayLists: boolean); override; + {** Renders the glyph's reflection } + procedure RenderReflection(); override; + + {** Freetype specific char-index (<> char-code) } + property CharIndex: FT_UInt read fCharIndex; + end; + + {** + * Freetype font class. + *} + TFTFont = class(TCachedFont) + private + procedure ResetIntern(); + + protected + fFilename: string; //**< filename of the font-file + fSize: integer; //**< Font base size (in pixels) + fOutset: single; //**< size of outset extrusion (in pixels) + fFace: FT_Face; //**< Holds the height of the font + fLoadFlags: FT_Int32; //**< FT glpyh load-flags + fFontUnitScale: TPositionDbl; //**< FT font-units to pixel ratio + fUseDisplayLists: boolean; //**< true: use display-lists, false: direct drawing + + {** @seealso TCachedFont.LoadGlyph } + function LoadGlyph(ch: WideChar): TGlyph; override; + + procedure Render(const Text: WideString); override; + function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override; + + function GetHeight(): single; override; + function GetAscender(): single; override; + function GetDescender(): single; override; + function GetUnderlinePosition(): single; override; + function GetUnderlineThickness(): single; override; + + property Face: FT_Face read fFace; + + public + {** + * Creates a font of size Size (in pixels) from the file Filename. + * If Outset (in pixels) is set to a value > 0 the glyphs will be extruded + * at their borders. Use it for e.g. a bold effect. + * @param LoadFlags flags passed to FT_Load_Glyph() + * @raises Exception if the font-file could not be loaded + *} + constructor Create(const Filename: string; + Size: integer; Outset: single = 0.0; + LoadFlags: FT_Int32 = FT_LOAD_DEFAULT); + + {** + * Frees all resources associated with the font. + *} + destructor Destroy(); override; + + {** @seealso TFont.Reset } + procedure Reset(); override; + + {** Size of the base font } + property Size: integer read fSize; + {** Outset size } + property Outset: single read fOutset; + end; + + TFTScalableFont = class(TScalableFont) + protected + function GetOutset(): single; virtual; + function CreateMipmap(Level: integer; Scale: single): TFont; override; + + public + {** + * Creates a scalable font of size Size (in pixels) from the file Filename. + * OutsetAmount is the ratio of the glyph extrusion. + * The extrusion in pixels is Size*OutsetAmount + * (0.0 -> no extrusion, 0.1 -> 10%). + *} + constructor Create(const Filename: string; + Size: integer; OutsetAmount: single = 0.0; + UseMipmaps: boolean = true); + + {** @seealso TGlyphCache.FlushCache } + procedure FlushCache(KeepBaseSet: boolean); + + {** Outset size (in pixels) of the scaled font } + property Outset: single read GetOutset; + end; + + + {** + * Represents a freetype font with an additional outline around its glyphs. + * The outline size is passed on creation and cannot be changed later. + *} + TFTOutlineFont = class(TFont) + private + fFilename: string; + fSize: integer; + fOutset: single; + fInnerFont, fOutlineFont: TFTFont; + fOutlineColor: TGLColor; + + procedure ResetIntern(); + + protected + procedure DrawUnderline(const Text: WideString); override; + procedure Render(const Text: WideString); override; + function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override; + + function GetHeight(): single; override; + function GetAscender(): single; override; + function GetDescender(): single; override; + procedure SetLineSpacing(Spacing: single); override; + procedure SetGlyphSpacing(Spacing: single); override; + procedure SetReflectionSpacing(Spacing: single); override; + procedure SetStyle(Style: TFontStyle); override; + function GetStyle(): TFontStyle; override; + function GetUnderlinePosition(): single; override; + function GetUnderlineThickness(): single; override; + procedure SetUseKerning(Enable: boolean); override; + procedure SetReflectionPass(Enable: boolean); override; + + public + constructor Create(const Filename: string; + Size: integer; Outset: single; + LoadFlags: FT_Int32 = FT_LOAD_DEFAULT); + destructor Destroy; override; + + {** + * Sets the color of the outline. + * If the alpha component is < 0, OpenGL's current alpha value will be + * used. + *} + procedure SetOutlineColor(r, g, b: GLfloat; a: GLfloat = -1.0); + + {** @seealso TGlyphCache.FlushCache } + procedure FlushCache(KeepBaseSet: boolean); + + {** @seealso TFont.Reset } + procedure Reset(); override; + + {** Size of the base font } + property Size: integer read fSize; + {** Outset size } + property Outset: single read fOutset; + end; + + {** + * Wrapper around TOutlineFont to allow font resizing. + * @seealso TScalableFont + *} + TFTScalableOutlineFont = class(TScalableFont) + protected + function GetOutset(): single; virtual; + function CreateMipmap(Level: integer; Scale: single): TFont; override; + + public + constructor Create(const Filename: string; + Size: integer; OutsetAmount: single; + UseMipmaps: boolean = true); + + {** @seealso TFTOutlineFont.SetOutlineColor } + procedure SetOutlineColor(r, g, b: GLfloat; a: GLfloat = -1.0); + + {** @seealso TGlyphCache.FlushCache } + procedure FlushCache(KeepBaseSet: boolean); + + {** Outset size } + property Outset: single read GetOutset; + end; + +{$IFDEF BITMAP_FONT} + + {** + * A bitmapped font loads it's glyphs from a bitmap and stores them in a + * texture. Unicode characters are not supported (but could be by supporting + * multiple textures each storing a subset of unicode glyphs). + * For backward compatibility only. + *} + TBitmapFont = class(TFont) + private + fTex: TTexture; + fTexSize: integer; + fBaseline: integer; + fAscender: integer; + fDescender: integer; + fWidths: array[0..255] of byte; //**< half widths + fOutline: integer; + fTempColor: TGLColor; //**< colours for the reflection + + procedure ResetIntern(); + + procedure RenderChar(ch: WideChar; var AdvanceX: real); + + {** + * Load font widths from an info file. + * @param InfoFile the name of the info (.dat) file + * @raises Exception if the file is corrupted + *} + procedure LoadFontInfo(const InfoFile: string); + + protected + procedure Render(const Text: WideString); override; + function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override; + + function GetHeight(): single; override; + function GetAscender(): single; override; + function GetDescender(): single; override; + function GetUnderlinePosition(): single; override; + function GetUnderlineThickness(): single; override; + + public + {** + * Creates a bitmapped font from image Filename and font width info + * loaded from the corresponding file with ending .dat. + * @param(Baseline y-coord of the baseline given in cartesian coords + * (y-axis up) and from the lower edge of the glyphs bounding box) + * @param(Ascender pixels from baseline to top of highest glyph) + *} + constructor Create(const Filename: string; Outline: integer; + Baseline, Ascender, Descender: integer); + destructor Destroy(); override; + + {** + * Corrects font widths provided by the info file. + * NewWidth := Width * WidthMult + WidthAdd + *} + procedure CorrectWidths(WidthMult: real; WidthAdd: integer); + + {** @seealso TFont.Reset } + procedure Reset(); override; + end; + +{$ENDIF BITMAP_FONT} + + TFreeType = class + public + {** + * Returns a pointer to the freetype library singleton. + * If non exists, freetype will be initialized. + * @raises Exception if initialization failed + *} + class function GetLibrary(): FT_Library; + class procedure FreeLibrary(); + end; + + +implementation + +uses Types; + +const + //** shear factor used for the italic effect (bigger value -> more bending) + cShearFactor = 0.25; + cShearMatrix: array[0..15] of GLfloat = ( + 1, 0, 0, 0, + cShearFactor, 1, 0, 0, + 0, 0, 1, 0, + 0, 0, 0, 1 + ); + cShearMatrixInv: array[0..15] of GLfloat = ( + 1, 0, 0, 0, + -cShearFactor, 1, 0, 0, + 0, 0, 1, 0, + 0, 0, 0, 1 + ); + +var + LibraryInst: FT_Library; + +function NewGLColor(r, g, b, a: GLfloat): TGLColor; +begin + Result.r := r; + Result.g := g; + Result.b := b; + Result.a := a; +end; + +{** + * Returns the first power of 2 >= Value. + *} +function NextPowerOf2(Value: integer): integer; {$IFDEF HasInline}inline;{$ENDIF} +begin + Result := 1; + while (Result < Value) do + Result := Result shl 1; +end; + + +{* + * TFont + *} + +constructor TFont.Create(); +begin + inherited; + ResetIntern(); +end; + +destructor TFont.Destroy(); +begin + inherited; +end; + +procedure TFont.ResetIntern(); +begin + fStyle := []; + fUseKerning := true; + fGlyphSpacing := 0.0; + fReflectionPass := false; + + // must be set by subclasses + fLineSpacing := 0.0; + fReflectionSpacing := 0.0; +end; + +procedure TFont.Reset(); +begin + ResetIntern(); +end; + +procedure TFont.SplitLines(const Text: UTF8String; var Lines: TWideStringArray); +var + LineList: TStringList; + LineIndex: integer; +begin + // split lines on newline (there is no WideString version of ExtractStrings) + LineList := TStringList.Create(); + ExtractStrings([#13], [], PChar(Text), LineList); + + // create an array of WideStrins from the UTF-8 string-list + SetLength(Lines, LineList.Count); + for LineIndex := 0 to LineList.Count-1 do + Lines[LineIndex] := UTF8Decode(LineList[LineIndex]); + LineList.Free(); +end; + +function TFont.BBox(const Text: UTF8String; Advance: boolean): TBoundsDbl; +var + LineArray: TWideStringArray; +begin + SplitLines(Text, LineArray); + Result := BBox(LineArray, Advance); + SetLength(LineArray, 0); +end; + +function TFont.BBox(const Text: WideString; Advance: boolean): TBoundsDbl; +begin + Result := BBox(UTF8Encode(Text), Advance); +end; + +procedure TFont.Print(const Text: TWideStringArray); +var + LineIndex: integer; +begin + // recursively call this function to draw reflected text + if ((Reflect in Style) and not ReflectionPass) then + begin + ReflectionPass := true; + Print(Text); + ReflectionPass := false; + end; + + // store current color, enable-flags, matrix-mode + glPushAttrib(GL_CURRENT_BIT or GL_ENABLE_BIT or GL_TRANSFORM_BIT); + + // set OpenGL state + glMatrixMode(GL_MODELVIEW); + glDisable(GL_DEPTH_TEST); + glEnable(GL_BLEND); + glEnable(GL_TEXTURE_2D); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + + { + // TODO: just draw texels with alpha > 0 to avoid setting z-buffer for them? + glAlphaFunc(GL_GREATER, 0); + glEnable(GL_ALPHA_TEST); + + //TODO: Do we need depth-testing? + if (ReflectionPass) then + begin + glDepthMask(0); + glEnable(GL_DEPTH_TEST); + end; + } + + {$IFDEF FLIP_YAXIS} + glPushMatrix(); + glScalef(1, -1, 1); + {$ENDIF} + + // display text + for LineIndex := 0 to High(Text) do + begin + glPushMatrix(); + + // move to baseline + glTranslatef(0, -LineSpacing*LineIndex, 0); + + if ((Underline in Style) and not ReflectionPass) then + begin + glDisable(GL_TEXTURE_2D); + DrawUnderline(Text[LineIndex]); + glEnable(GL_TEXTURE_2D); + end; + + // draw reflection + if (ReflectionPass) then + begin + // set reflection spacing + glTranslatef(0, -ReflectionSpacing, 0); + // flip y-axis + glScalef(1, -1, 1); + end; + + // shear for italic effect + if (Italic in Style) then + glMultMatrixf(@cShearMatrix); + // render text line - Render(Text[LineIndex]);
-
- glPopMatrix();
- end;
-
- // restore settings
- {$IFDEF FLIP_YAXIS}
- glPopMatrix();
- {$ENDIF}
- glPopAttrib();
-end;
-
-procedure TFont.Print(const Text: string);
-var
- LineArray: TWideStringArray;
-begin
- SplitLines(Text, LineArray);
- Print(LineArray);
- SetLength(LineArray, 0);
-end;
-
-procedure TFont.Print(const Text: WideString);
-begin
- Print(UTF8Encode(Text));
-end;
-
-procedure TFont.DrawUnderline(const Text: WideString);
+ Render(Text[LineIndex]); + + glPopMatrix(); + end; + + // restore settings + {$IFDEF FLIP_YAXIS} + glPopMatrix(); + {$ENDIF} + glPopAttrib(); +end; + +procedure TFont.Print(const Text: string); +var + LineArray: TWideStringArray; +begin + SplitLines(Text, LineArray); + Print(LineArray); + SetLength(LineArray, 0); +end; + +procedure TFont.Print(const Text: WideString); +begin + Print(UTF8Encode(Text)); +end; + +procedure TFont.DrawUnderline(const Text: WideString); var UnderlineY1, UnderlineY2: single; Bounds: TBoundsDbl; begin - UnderlineY1 := GetUnderlinePosition();
- UnderlineY2 := UnderlineY1 + GetUnderlineThickness();
- Bounds := BBox(Text);
- glRectf(Bounds.Left, UnderlineY1, Bounds.Right, UnderlineY2);
-end;
-
-procedure TFont.SetStyle(Style: TFontStyle);
-begin
- fStyle := Style;
-end;
-
-function TFont.GetStyle(): TFontStyle;
-begin
- Result := fStyle;
-end;
-
-procedure TFont.SetLineSpacing(Spacing: single);
-begin
- fLineSpacing := Spacing;
-end;
-
-function TFont.GetLineSpacing(): single;
-begin
- Result := fLineSpacing;
-end;
-
-procedure TFont.SetGlyphSpacing(Spacing: single);
-begin
- fGlyphSpacing := Spacing;
-end;
-
-function TFont.GetGlyphSpacing(): single;
-begin
- Result := fGlyphSpacing;
-end;
-
-procedure TFont.SetReflectionSpacing(Spacing: single);
-begin
- fReflectionSpacing := Spacing;
-end;
-
-function TFont.GetReflectionSpacing(): single;
-begin
- Result := fReflectionSpacing;
-end;
-
-procedure TFont.SetUseKerning(Enable: boolean);
-begin
- fUseKerning := Enable;
-end;
-
-function TFont.GetUseKerning(): boolean;
-begin
- Result := fUseKerning;
-end;
-
-procedure TFont.SetReflectionPass(Enable: boolean);
-begin
- fReflectionPass := Enable;
-end;
-
-
-{*
- * TScalableFont
- *}
-
-constructor TScalableFont.Create(Font: TFont; UseMipmaps: boolean);
-var
- MipmapLevel: integer;
-begin
- inherited Create();
-
- fBaseFont := Font;
- fMipmapFonts[0] := Font;
- fUseMipmaps := UseMipmaps;
- ResetIntern();
-
- // create mipmap fonts if requested
- if (UseMipmaps) then
- begin
- for MipmapLevel := 1 to cMaxMipmapLevel do
- begin
- fMipmapFonts[MipmapLevel] := CreateMipmap(MipmapLevel, 1/(1 shl MipmapLevel));
- // stop if no smaller mipmap font is returned
- if (fMipmapFonts[MipmapLevel] = nil) then
- Break;
- end;
- end;
-end;
-
-destructor TScalableFont.Destroy();
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- fMipmapFonts[Level].Free;
- inherited;
-end;
-
-procedure TScalableFont.ResetIntern();
-begin
- fScale := 1.0;
- fAspect := 1.0;
-end;
-
-procedure TScalableFont.Reset();
-var
- Level: integer;
-begin
- inherited;
- ResetIntern();
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].Reset();
-end;
-
-{**
- * Returns the mipmap level to use with regard to the current projection
- * and modelview matrix, font scale and aspect.
- *
- * Note:
- * - for Freetype fonts, hinting and grid-fitting must be disabled, otherwise
- * the glyph widths/heights ratios and advance widths of the mipmap fonts
- * do not match as they are adjusted sligthly (e.g. an 'a' at size 12px has
- * width 12px, but at size 6px width 8px).
- * - returned mipmap-level is used for all glyphs of the current text to print.
- * This is faster, much easier to handle, since we just need to create
- * multiple sized fonts and select the one we need for the mipmap-level and
- * it avoids that neighbored glyphs use different mipmap-level which might
- * look odd because one glyph might look blurry and the other sharp.
- *
- * Motivation:
- * We do not use OpenGL for mipmapping as the results are very bad. At least
- * with automatic mipmap generation (gluBuildMipmaps) the fonts look rather
- * blurry.
- * Defining our own mipmaps by creating multiple textures with
- * for different mimap levels is a pain, as the font size passed to freetype
- * is not the size of the bitmaps created and it does not guarantee that a
- * glyph bitmap of a font with font-size s/2 is half the size of the font with
- * font-size s. If the bitmap size is just a single pixel bigger than the half
- * we might need a texture of the next power-of-2 and the texture would not be
- * half of the size of the next bigger mipmap. In addition we use a fixed one
- * pixel sized border to smooth the texture (see cTexSmoothBorder) and maybe
- * an outset that is added to the font, so creating a glyph mipmap that is
- * exactly half the size of the next bigger one is a very difficult task.
- *
- * Solution:
- * Use mipmap textures that are not exactly half the size of the next mipmap
- * level. OpenGL does not support this (at least not without extensions).
- * The trickiest task is to determine the mipmap to use by calculating the
- * amount of minification that is performed in this function.
- *}
-function TScalableFont.GetMipmapLevel(): integer;
-var
- ModelMatrix, ProjMatrix: T16dArray;
- WinCoords: array[0..2, 0..2] of GLdouble;
- ViewPortArray: TViewPortArray;
- Dist, Dist2: double;
- WidthScale, HeightScale: double;
-const
- // width/height of square used for determining the scale
- cTestSize = 10.0;
- // an offset to the mipmap-level to adjust the change-over of two consecutive
- // mipmap levels. If for example the bias is 0.1 and unbiased level is 1.9
- // the result level will be 2. A bias of 0.5 is equal to rounding.
- // With bias=0.1 we prefer larger mipmaps over smaller ones.
- cBias = 0.2;
-begin
- // 1. retrieve current transformation matrices for gluProject
- glGetDoublev(GL_MODELVIEW_MATRIX, @ModelMatrix);
- glGetDoublev(GL_PROJECTION_MATRIX, @ProjMatrix);
- glGetIntegerv(GL_VIEWPORT, @ViewPortArray);
-
- // 2. project three of the corner points of a square with size cTestSize
- // to window coordinates (the square is just a dummy for a glyph)
-
- // project point (x1, y1) to window corrdinates
- gluProject(0, 0, 0,
- ModelMatrix, ProjMatrix, ViewPortArray,
- @WinCoords[0][0], @WinCoords[0][1], @WinCoords[0][2]);
- // project point (x2, y1) to window corrdinates
- gluProject(cTestSize, 0, 0,
- ModelMatrix, ProjMatrix, ViewPortArray,
- @WinCoords[1][0], @WinCoords[1][1], @WinCoords[1][2]);
- // project point (x1, y2) to window corrdinates
- gluProject(0, cTestSize, 0,
- ModelMatrix, ProjMatrix, ViewPortArray,
- @WinCoords[2][0], @WinCoords[2][1], @WinCoords[2][2]);
-
- // 3. Lets see how much the width and height of the square changed.
- // Calculate the width and height as displayed on the screen in window
- // coordinates and calculate the ratio to the original coordinates in
- // modelview space so the ratio gives us the scale (minification here).
-
- // projected width ||(x1, y1) - (x2, y1)||
- Dist := (WinCoords[0][0] - WinCoords[1][0]);
- Dist2 := (WinCoords[0][1] - WinCoords[1][1]);
- WidthScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2);
-
- // projected height ||(x1, y1) - (x1, y2)||
- Dist := (WinCoords[0][0] - WinCoords[2][0]);
- Dist2 := (WinCoords[0][1] - WinCoords[2][1]);
- HeightScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2);
-
- //writeln(Format('Scale %f, %f', [WidthScale, HeightScale]));
-
- // 4. Now that we have got the scale, take the bigger minification scale
- // and get it to a logarithmic scale as each mipmap is 1/2 the size of its
- // predecessor (Mipmap_size[i] = Mipmap_size[i-1]/2).
- // The result is our mipmap-level = the index of the mipmap to use.
-
- // Level > 0: Minification; < 0: Magnification
- Result := Trunc(Log2(Max(WidthScale, HeightScale)) + cBias);
-
- // clamp to valid range
- if (Result < 0) then
- Result := 0;
- if (Result > High(fMipmapFonts)) then
- Result := High(fMipmapFonts);
-end;
-
-function TScalableFont.GetMipmapScale(Level: integer): single;
-begin
- if (fMipmapFonts[Level] = nil) then
- begin
- Result := -1;
- Exit;
- end;
-
- Result := fScale * fMipmapFonts[0].Height / fMipmapFonts[Level].Height;
-end;
-
-{**
- * Returns the correct mipmap font for the current scale and projection
- * matrix. The modelview scale is adjusted to the mipmap level, so
- * Result.Print() will display the font in the correct size.
- *}
-function TScalableFont.ChooseMipmapFont(): TFont;
-var
- DesiredLevel: integer;
- Level: integer;
- MipmapScale: single;
-begin
- Result := nil;
- DesiredLevel := GetMipmapLevel();
-
- // get the smallest mipmap available for the desired level
- // as not all levels must be assigned to a font.
- for Level := DesiredLevel downto 0 do
- begin
- if (fMipmapFonts[Level] <> nil) then
- begin
- Result := fMipmapFonts[Level];
- Break;
- end;
- end;
-
- // since the mipmap font (if level > 0) is smaller than the base-font
- // we have to scale to get its size right.
- MipmapScale := fMipmapFonts[0].Height/Result.Height;
- glScalef(MipmapScale, MipmapScale, 0);
-end;
-
-procedure TScalableFont.Print(const Text: TWideStringArray);
-begin
- glPushMatrix();
-
- // set scale and stretching
- glScalef(fScale * fAspect, fScale, 0);
-
- // print text
- if (fUseMipmaps) then
- ChooseMipmapFont().Print(Text)
- else
- fBaseFont.Print(Text);
-
- glPopMatrix();
-end;
-
-procedure TScalableFont.Render(const Text: WideString);
-begin
- Assert(false, 'Unused TScalableFont.Render() was called');
-end;
-
-function TScalableFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-begin
- Result := fBaseFont.BBox(Text, Advance);
- Result.Left := Result.Left * fScale * fAspect;
- Result.Right := Result.Right * fScale * fAspect;
- Result.Top := Result.Top * fScale;
- Result.Bottom := Result.Bottom * fScale;
-end;
-
-procedure TScalableFont.SetHeight(Height: single);
-begin
- fScale := Height / fBaseFont.GetHeight();
-end;
-
-function TScalableFont.GetHeight(): single;
-begin
- Result := fBaseFont.GetHeight() * fScale;
-end;
-
-procedure TScalableFont.SetAspect(Aspect: single);
-begin
- fAspect := Aspect;
-end;
-
-function TScalableFont.GetAspect(): single;
-begin
- Result := fAspect;
-end;
-
-function TScalableFont.GetAscender(): single;
-begin
- Result := fBaseFont.GetAscender() * fScale;
-end;
-
-function TScalableFont.GetDescender(): single;
-begin
- Result := fBaseFont.GetDescender() * fScale;
-end;
-
-procedure TScalableFont.SetLineSpacing(Spacing: single);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetLineSpacing(Spacing / GetMipmapScale(Level));
-end;
-
-function TScalableFont.GetLineSpacing(): single;
-begin
- Result := fBaseFont.GetLineSpacing() * fScale;
-end;
-
-procedure TScalableFont.SetGlyphSpacing(Spacing: single);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetGlyphSpacing(Spacing / GetMipmapScale(Level));
-end;
-
-function TScalableFont.GetGlyphSpacing(): single;
-begin
- Result := fBaseFont.GetGlyphSpacing() * fScale;
-end;
-
-procedure TScalableFont.SetReflectionSpacing(Spacing: single);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetReflectionSpacing(Spacing / GetMipmapScale(Level));
-end;
-
-function TScalableFont.GetReflectionSpacing(): single;
-begin
- Result := fBaseFont.GetLineSpacing() * fScale;
-end;
-
-procedure TScalableFont.SetStyle(Style: TFontStyle);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetStyle(Style);
-end;
-
-function TScalableFont.GetStyle(): TFontStyle;
-begin
- Result := fBaseFont.GetStyle();
-end;
-
-function TScalableFont.GetUnderlinePosition(): single;
-begin
- Result := fBaseFont.GetUnderlinePosition();
-end;
-
-function TScalableFont.GetUnderlineThickness(): single;
-begin
- Result := fBaseFont.GetUnderlinePosition();
-end;
-
-procedure TScalableFont.SetUseKerning(Enable: boolean);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetUseKerning(Enable);
-end;
-
-
-{*
- * TCachedFont
- *}
-
-constructor TCachedFont.Create();
-begin
- inherited;
- fCache := TGlyphCache.Create();
-end;
-
-destructor TCachedFont.Destroy();
-begin
- fCache.Free;
- inherited;
-end;
-
-function TCachedFont.GetGlyph(ch: WideChar): TGlyph;
-begin
- Result := fCache.GetGlyph(ch);
- if (Result = nil) then
- begin
- Result := LoadGlyph(ch);
- if (not fCache.AddGlyph(ch, Result)) then
- Result.Free;
- end;
-end;
-
-procedure TCachedFont.FlushCache(KeepBaseSet: boolean);
-begin
- fCache.FlushCache(KeepBaseSet);
-end;
-
-
-{*
- * TFTFont
- *}
-
-constructor TFTFont.Create(
- const Filename: string;
- Size: integer; Outset: single;
- LoadFlags: FT_Int32);
-var
- i: WideChar;
-begin
- inherited Create();
-
- fFilename := Filename;
- fSize := Size;
- fOutset := Outset;
- fLoadFlags := LoadFlags;
- fUseDisplayLists := true;
-
- // load font information
- if (FT_New_Face(TFreeType.GetLibrary(), PChar(Filename), 0, fFace) <> 0) then
- raise Exception.Create('FT_New_Face: Could not load font ''' + Filename + '''');
-
- // support scalable fonts only
- if (not FT_IS_SCALABLE(fFace)) then
- raise Exception.Create('Font is not scalable');
-
- if (FT_Set_Pixel_Sizes(fFace, 0, Size) <> 0) then
- raise Exception.Create('FT_Set_Pixel_Sizes failes');
-
- // get scale factor for font-unit to pixel-size transformation
- fFontUnitScale.X := fFace.size.metrics.x_ppem / fFace.units_per_EM;
- fFontUnitScale.Y := fFace.size.metrics.y_ppem / fFace.units_per_EM;
-
- ResetIntern();
-
- // pre-cache some commonly used glyphs (' ' - '~')
- for i := #32 to #126 do
- fCache.AddGlyph(i, TFTGlyph.Create(Self, i, Outset, LoadFlags));
-end;
-
-destructor TFTFont.Destroy();
-begin
- // free face
- FT_Done_Face(fFace);
- inherited;
-end;
-
-procedure TFTFont.ResetIntern();
-begin
- // Note: outset and non outset fonts use same spacing
- fLineSpacing := fFace.height * fFontUnitScale.Y;
- fReflectionSpacing := -2*fFace.descender * fFontUnitScale.Y;
-end;
-
-procedure TFTFont.Reset();
-begin
- inherited;
- ResetIntern();
-end;
-
-function TFTFont.LoadGlyph(ch: WideChar): TGlyph;
-begin
- Result := TFTGlyph.Create(Self, ch, Outset, fLoadFlags);
-end;
-
-function TFTFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-var
- Glyph, PrevGlyph: TFTGlyph;
- TextLine: WideString;
- LineYOffset: single;
- LineIndex, CharIndex: integer;
- LineBounds: TBoundsDbl;
- KernDelta: FT_Vector;
- UnderlinePos: double;
-begin
- // Reset global bounds
- Result.Left := Infinity;
- Result.Right := 0;
- Result.Bottom := Infinity;
- Result.Top := 0;
-
- // reset last glyph
- PrevGlyph := nil;
-
- // display text
- for LineIndex := 0 to High(Text) do
- begin
- // get next text line
- TextLine := Text[LineIndex];
- LineYOffset := -LineSpacing * LineIndex;
-
- // reset line bounds
- LineBounds.Left := Infinity;
- LineBounds.Right := 0;
- LineBounds.Bottom := Infinity;
- LineBounds.Top := 0;
-
- // for each glyph image, compute its bounding box
- for CharIndex := 1 to Length(TextLine) do
- begin
- Glyph := TFTGlyph(GetGlyph(TextLine[CharIndex]));
- if (Glyph <> nil) then
- begin
- // get kerning
- if (fUseKerning and FT_HAS_KERNING(fFace) and (PrevGlyph <> nil)) then
- begin
- FT_Get_Kerning(fFace, PrevGlyph.CharIndex, Glyph.CharIndex,
- FT_KERNING_UNSCALED, KernDelta);
- LineBounds.Right := LineBounds.Right + KernDelta.x * fFontUnitScale.X;
- end;
-
- // update left bound (must be done before right bound is updated)
- if (LineBounds.Right + Glyph.Bounds.Left < LineBounds.Left) then
- LineBounds.Left := LineBounds.Right + Glyph.Bounds.Left;
-
- // update right bound
- if (CharIndex < Length(TextLine)) or // not the last character
- (TextLine[CharIndex] = ' ') or // on space char (Bounds.Right = 0)
- Advance then // or in advance mode
- begin
- // add advance and glyph spacing
- LineBounds.Right := LineBounds.Right + Glyph.Advance.x + GlyphSpacing
- end
- else
- begin
- // add glyph's right bound
- LineBounds.Right := LineBounds.Right + Glyph.Bounds.Right;
- end;
-
- // update bottom and top bounds
- if (Glyph.Bounds.Bottom < LineBounds.Bottom) then
- LineBounds.Bottom := Glyph.Bounds.Bottom;
- if (Glyph.Bounds.Top > LineBounds.Top) then
- LineBounds.Top := Glyph.Bounds.Top;
- end;
-
- PrevGlyph := Glyph;
- end;
-
- // handle italic font style
- if (Italic in Style) then
- begin
- LineBounds.Left := LineBounds.Left + LineBounds.Bottom * cShearFactor;
- LineBounds.Right := LineBounds.Right + LineBounds.Top * cShearFactor;
- end;
-
- // handle underlined font style
- if (Underline in Style) then
- begin
- UnderlinePos := GetUnderlinePosition();
- if (UnderlinePos < LineBounds.Bottom) then
- LineBounds.Bottom := UnderlinePos;
- end;
-
- // add line offset
- LineBounds.Bottom := LineBounds.Bottom + LineYOffset;
- LineBounds.Top := LineBounds.Top + LineYOffset;
-
- // adjust global bounds
- if (Result.Left > LineBounds.Left) then
- Result.Left := LineBounds.Left;
- if (Result.Right < LineBounds.Right) then
- Result.Right := LineBounds.Right;
- if (Result.Bottom > LineBounds.Bottom) then
- Result.Bottom := LineBounds.Bottom;
- if (Result.Top < LineBounds.Top) then
- Result.Top := LineBounds.Top;
- end;
-
- // if left or bottom bound was not set, set them to 0
- if (Result.Left = Infinity) then
- Result.Left := 0.0;
- if (Result.Bottom = Infinity) then
- Result.Bottom := 0.0;
-end;
-
-procedure TFTFont.Render(const Text: WideString);
+ UnderlineY1 := GetUnderlinePosition(); + UnderlineY2 := UnderlineY1 + GetUnderlineThickness(); + Bounds := BBox(Text, false); + glRectf(Bounds.Left, UnderlineY1, Bounds.Right, UnderlineY2); +end; + +procedure TFont.SetStyle(Style: TFontStyle); +begin + fStyle := Style; +end; + +function TFont.GetStyle(): TFontStyle; +begin + Result := fStyle; +end; + +procedure TFont.SetLineSpacing(Spacing: single); +begin + fLineSpacing := Spacing; +end; + +function TFont.GetLineSpacing(): single; +begin + Result := fLineSpacing; +end; + +procedure TFont.SetGlyphSpacing(Spacing: single); +begin + fGlyphSpacing := Spacing; +end; + +function TFont.GetGlyphSpacing(): single; +begin + Result := fGlyphSpacing; +end; + +procedure TFont.SetReflectionSpacing(Spacing: single); +begin + fReflectionSpacing := Spacing; +end; + +function TFont.GetReflectionSpacing(): single; +begin + Result := fReflectionSpacing; +end; + +procedure TFont.SetUseKerning(Enable: boolean); +begin + fUseKerning := Enable; +end; + +function TFont.GetUseKerning(): boolean; +begin + Result := fUseKerning; +end; + +procedure TFont.SetReflectionPass(Enable: boolean); +begin + fReflectionPass := Enable; +end; + + +{* + * TScalableFont + *} + +constructor TScalableFont.Create(Font: TFont; UseMipmaps: boolean); +var + MipmapLevel: integer; +begin + inherited Create(); + + fBaseFont := Font; + fMipmapFonts[0] := Font; + fUseMipmaps := UseMipmaps; + ResetIntern(); + + // create mipmap fonts if requested + if (UseMipmaps) then + begin + for MipmapLevel := 1 to cMaxMipmapLevel do + begin + fMipmapFonts[MipmapLevel] := CreateMipmap(MipmapLevel, 1/(1 shl MipmapLevel)); + // stop if no smaller mipmap font is returned + if (fMipmapFonts[MipmapLevel] = nil) then + Break; + end; + end; +end; + +destructor TScalableFont.Destroy(); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + fMipmapFonts[Level].Free; + inherited; +end; + +procedure TScalableFont.ResetIntern(); +begin + fScale := 1.0; + fAspect := 1.0; +end; + +procedure TScalableFont.Reset(); +var + Level: integer; +begin + inherited; + ResetIntern(); + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + fMipmapFonts[Level].Reset(); +end; + +{** + * Returns the mipmap level to use with regard to the current projection + * and modelview matrix, font scale and aspect. + * + * Note: + * - for Freetype fonts, hinting and grid-fitting must be disabled, otherwise + * the glyph widths/heights ratios and advance widths of the mipmap fonts + * do not match as they are adjusted sligthly (e.g. an 'a' at size 12px has + * width 12px, but at size 6px width 8px). + * - returned mipmap-level is used for all glyphs of the current text to print. + * This is faster, much easier to handle, since we just need to create + * multiple sized fonts and select the one we need for the mipmap-level and + * it avoids that neighbored glyphs use different mipmap-level which might + * look odd because one glyph might look blurry and the other sharp. + * + * Motivation: + * We do not use OpenGL for mipmapping as the results are very bad. At least + * with automatic mipmap generation (gluBuildMipmaps) the fonts look rather + * blurry. + * Defining our own mipmaps by creating multiple textures with + * for different mimap levels is a pain, as the font size passed to freetype + * is not the size of the bitmaps created and it does not guarantee that a + * glyph bitmap of a font with font-size s/2 is half the size of the font with + * font-size s. If the bitmap size is just a single pixel bigger than the half + * we might need a texture of the next power-of-2 and the texture would not be + * half of the size of the next bigger mipmap. In addition we use a fixed one + * pixel sized border to smooth the texture (see cTexSmoothBorder) and maybe + * an outset that is added to the font, so creating a glyph mipmap that is + * exactly half the size of the next bigger one is a very difficult task. + * + * Solution: + * Use mipmap textures that are not exactly half the size of the next mipmap + * level. OpenGL does not support this (at least not without extensions). + * The trickiest task is to determine the mipmap to use by calculating the + * amount of minification that is performed in this function. + *} +function TScalableFont.GetMipmapLevel(): integer; +var + ModelMatrix, ProjMatrix: T16dArray; + WinCoords: array[0..2, 0..2] of GLdouble; + ViewPortArray: TViewPortArray; + Dist, Dist2: double; + WidthScale, HeightScale: double; +const + // width/height of square used for determining the scale + cTestSize = 10.0; + // an offset to the mipmap-level to adjust the change-over of two consecutive + // mipmap levels. If for example the bias is 0.1 and unbiased level is 1.9 + // the result level will be 2. A bias of 0.5 is equal to rounding. + // With bias=0.1 we prefer larger mipmaps over smaller ones. + cBias = 0.2; +begin + // 1. retrieve current transformation matrices for gluProject + glGetDoublev(GL_MODELVIEW_MATRIX, @ModelMatrix); + glGetDoublev(GL_PROJECTION_MATRIX, @ProjMatrix); + glGetIntegerv(GL_VIEWPORT, @ViewPortArray); + + // 2. project three of the corner points of a square with size cTestSize + // to window coordinates (the square is just a dummy for a glyph) + + // project point (x1, y1) to window corrdinates + gluProject(0, 0, 0, + ModelMatrix, ProjMatrix, ViewPortArray, + @WinCoords[0][0], @WinCoords[0][1], @WinCoords[0][2]); + // project point (x2, y1) to window corrdinates + gluProject(cTestSize, 0, 0, + ModelMatrix, ProjMatrix, ViewPortArray, + @WinCoords[1][0], @WinCoords[1][1], @WinCoords[1][2]); + // project point (x1, y2) to window corrdinates + gluProject(0, cTestSize, 0, + ModelMatrix, ProjMatrix, ViewPortArray, + @WinCoords[2][0], @WinCoords[2][1], @WinCoords[2][2]); + + // 3. Lets see how much the width and height of the square changed. + // Calculate the width and height as displayed on the screen in window + // coordinates and calculate the ratio to the original coordinates in + // modelview space so the ratio gives us the scale (minification here). + + // projected width ||(x1, y1) - (x2, y1)|| + Dist := (WinCoords[0][0] - WinCoords[1][0]); + Dist2 := (WinCoords[0][1] - WinCoords[1][1]); + WidthScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2); + + // projected height ||(x1, y1) - (x1, y2)|| + Dist := (WinCoords[0][0] - WinCoords[2][0]); + Dist2 := (WinCoords[0][1] - WinCoords[2][1]); + HeightScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2); + + //writeln(Format('Scale %f, %f', [WidthScale, HeightScale])); + + // 4. Now that we have got the scale, take the bigger minification scale + // and get it to a logarithmic scale as each mipmap is 1/2 the size of its + // predecessor (Mipmap_size[i] = Mipmap_size[i-1]/2). + // The result is our mipmap-level = the index of the mipmap to use. + + // Level > 0: Minification; < 0: Magnification + Result := Trunc(Log2(Max(WidthScale, HeightScale)) + cBias); + + // clamp to valid range + if (Result < 0) then + Result := 0; + if (Result > High(fMipmapFonts)) then + Result := High(fMipmapFonts); +end; + +function TScalableFont.GetMipmapScale(Level: integer): single; +begin + if (fMipmapFonts[Level] = nil) then + begin + Result := -1; + Exit; + end; + + Result := fScale * fMipmapFonts[0].Height / fMipmapFonts[Level].Height; +end; + +{** + * Returns the correct mipmap font for the current scale and projection + * matrix. The modelview scale is adjusted to the mipmap level, so + * Result.Print() will display the font in the correct size. + *} +function TScalableFont.ChooseMipmapFont(): TFont; +var + DesiredLevel: integer; + Level: integer; + MipmapScale: single; +begin + Result := nil; + DesiredLevel := GetMipmapLevel(); + + // get the smallest mipmap available for the desired level + // as not all levels must be assigned to a font. + for Level := DesiredLevel downto 0 do + begin + if (fMipmapFonts[Level] <> nil) then + begin + Result := fMipmapFonts[Level]; + Break; + end; + end; + + // since the mipmap font (if level > 0) is smaller than the base-font + // we have to scale to get its size right. + MipmapScale := fMipmapFonts[0].Height/Result.Height; + glScalef(MipmapScale, MipmapScale, 0); +end; + +procedure TScalableFont.Print(const Text: TWideStringArray); +begin + glPushMatrix(); + + // set scale and stretching + glScalef(fScale * fAspect, fScale, 0); + + // print text + if (fUseMipmaps) then + ChooseMipmapFont().Print(Text) + else + fBaseFont.Print(Text); + + glPopMatrix(); +end; + +procedure TScalableFont.Render(const Text: WideString); +begin + Assert(false, 'Unused TScalableFont.Render() was called'); +end; + +function TScalableFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; +begin + Result := fBaseFont.BBox(Text, Advance); + Result.Left := Result.Left * fScale * fAspect; + Result.Right := Result.Right * fScale * fAspect; + Result.Top := Result.Top * fScale; + Result.Bottom := Result.Bottom * fScale; +end; + +procedure TScalableFont.SetHeight(Height: single); +begin + fScale := Height / fBaseFont.GetHeight(); +end; + +function TScalableFont.GetHeight(): single; +begin + Result := fBaseFont.GetHeight() * fScale; +end; + +procedure TScalableFont.SetAspect(Aspect: single); +begin + fAspect := Aspect; +end; + +function TScalableFont.GetAspect(): single; +begin + Result := fAspect; +end; + +function TScalableFont.GetAscender(): single; +begin + Result := fBaseFont.GetAscender() * fScale; +end; + +function TScalableFont.GetDescender(): single; +begin + Result := fBaseFont.GetDescender() * fScale; +end; + +procedure TScalableFont.SetLineSpacing(Spacing: single); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + fMipmapFonts[Level].SetLineSpacing(Spacing / GetMipmapScale(Level)); +end; + +function TScalableFont.GetLineSpacing(): single; +begin + Result := fBaseFont.GetLineSpacing() * fScale; +end; + +procedure TScalableFont.SetGlyphSpacing(Spacing: single); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + fMipmapFonts[Level].SetGlyphSpacing(Spacing / GetMipmapScale(Level)); +end; + +function TScalableFont.GetGlyphSpacing(): single; +begin + Result := fBaseFont.GetGlyphSpacing() * fScale; +end; + +procedure TScalableFont.SetReflectionSpacing(Spacing: single); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + fMipmapFonts[Level].SetReflectionSpacing(Spacing / GetMipmapScale(Level)); +end; + +function TScalableFont.GetReflectionSpacing(): single; +begin + Result := fBaseFont.GetLineSpacing() * fScale; +end; + +procedure TScalableFont.SetStyle(Style: TFontStyle); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + fMipmapFonts[Level].SetStyle(Style); +end; + +function TScalableFont.GetStyle(): TFontStyle; +begin + Result := fBaseFont.GetStyle(); +end; + +function TScalableFont.GetUnderlinePosition(): single; +begin + Result := fBaseFont.GetUnderlinePosition(); +end; + +function TScalableFont.GetUnderlineThickness(): single; +begin + Result := fBaseFont.GetUnderlinePosition(); +end; + +procedure TScalableFont.SetUseKerning(Enable: boolean); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + fMipmapFonts[Level].SetUseKerning(Enable); +end; + + +{* + * TCachedFont + *} + +constructor TCachedFont.Create(); +begin + inherited; + fCache := TGlyphCache.Create(); +end; + +destructor TCachedFont.Destroy(); +begin + fCache.Free; + inherited; +end; + +function TCachedFont.GetGlyph(ch: WideChar): TGlyph; +begin + Result := fCache.GetGlyph(ch); + if (Result = nil) then + begin + Result := LoadGlyph(ch); + if (not fCache.AddGlyph(ch, Result)) then + Result.Free; + end; +end; + +procedure TCachedFont.FlushCache(KeepBaseSet: boolean); +begin + fCache.FlushCache(KeepBaseSet); +end; + + +{* + * TFTFont + *} + +constructor TFTFont.Create( + const Filename: string; + Size: integer; Outset: single; + LoadFlags: FT_Int32); +var + i: WideChar; +begin + inherited Create(); + + fFilename := Filename; + fSize := Size; + fOutset := Outset; + fLoadFlags := LoadFlags; + fUseDisplayLists := true; + + // load font information + if (FT_New_Face(TFreeType.GetLibrary(), PChar(Filename), 0, fFace) <> 0) then + raise Exception.Create('FT_New_Face: Could not load font ''' + Filename + ''''); + + // support scalable fonts only + if (not FT_IS_SCALABLE(fFace)) then + raise Exception.Create('Font is not scalable'); + + if (FT_Set_Pixel_Sizes(fFace, 0, Size) <> 0) then + raise Exception.Create('FT_Set_Pixel_Sizes failes'); + + // get scale factor for font-unit to pixel-size transformation + fFontUnitScale.X := fFace.size.metrics.x_ppem / fFace.units_per_EM; + fFontUnitScale.Y := fFace.size.metrics.y_ppem / fFace.units_per_EM; + + ResetIntern(); + + // pre-cache some commonly used glyphs (' ' - '~') + for i := #32 to #126 do + fCache.AddGlyph(i, TFTGlyph.Create(Self, i, Outset, LoadFlags)); +end; + +destructor TFTFont.Destroy(); +begin + // free face + FT_Done_Face(fFace); + inherited; +end; + +procedure TFTFont.ResetIntern(); +begin + // Note: outset and non outset fonts use same spacing + fLineSpacing := fFace.height * fFontUnitScale.Y; + fReflectionSpacing := -2*fFace.descender * fFontUnitScale.Y; +end; + +procedure TFTFont.Reset(); +begin + inherited; + ResetIntern(); +end; + +function TFTFont.LoadGlyph(ch: WideChar): TGlyph; +begin + Result := TFTGlyph.Create(Self, ch, Outset, fLoadFlags); +end; + +function TFTFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; +var + Glyph, PrevGlyph: TFTGlyph; + TextLine: WideString; + LineYOffset: single; + LineIndex, CharIndex: integer; + LineBounds: TBoundsDbl; + KernDelta: FT_Vector; + UnderlinePos: double; +begin + // Reset global bounds + Result.Left := Infinity; + Result.Right := 0; + Result.Bottom := Infinity; + Result.Top := 0; + + // reset last glyph + PrevGlyph := nil; + + // display text + for LineIndex := 0 to High(Text) do + begin + // get next text line + TextLine := Text[LineIndex]; + LineYOffset := -LineSpacing * LineIndex; + + // reset line bounds + LineBounds.Left := Infinity; + LineBounds.Right := 0; + LineBounds.Bottom := Infinity; + LineBounds.Top := 0; + + // for each glyph image, compute its bounding box + for CharIndex := 1 to Length(TextLine) do + begin + Glyph := TFTGlyph(GetGlyph(TextLine[CharIndex])); + if (Glyph <> nil) then + begin + // get kerning + if (fUseKerning and FT_HAS_KERNING(fFace) and (PrevGlyph <> nil)) then + begin + FT_Get_Kerning(fFace, PrevGlyph.CharIndex, Glyph.CharIndex, + FT_KERNING_UNSCALED, KernDelta); + LineBounds.Right := LineBounds.Right + KernDelta.x * fFontUnitScale.X; + end; + + // update left bound (must be done before right bound is updated) + if (LineBounds.Right + Glyph.Bounds.Left < LineBounds.Left) then + LineBounds.Left := LineBounds.Right + Glyph.Bounds.Left; + + // update right bound + if (CharIndex < Length(TextLine)) or // not the last character + (TextLine[CharIndex] = ' ') or // on space char (Bounds.Right = 0) + Advance then // or in advance mode + begin + // add advance and glyph spacing + LineBounds.Right := LineBounds.Right + Glyph.Advance.x + GlyphSpacing + end + else + begin + // add glyph's right bound + LineBounds.Right := LineBounds.Right + Glyph.Bounds.Right; + end; + + // update bottom and top bounds + if (Glyph.Bounds.Bottom < LineBounds.Bottom) then + LineBounds.Bottom := Glyph.Bounds.Bottom; + if (Glyph.Bounds.Top > LineBounds.Top) then + LineBounds.Top := Glyph.Bounds.Top; + end; + + PrevGlyph := Glyph; + end; + + // handle italic font style + if (Italic in Style) then + begin + LineBounds.Left := LineBounds.Left + LineBounds.Bottom * cShearFactor; + LineBounds.Right := LineBounds.Right + LineBounds.Top * cShearFactor; + end; + + // handle underlined font style + if (Underline in Style) then + begin + UnderlinePos := GetUnderlinePosition(); + if (UnderlinePos < LineBounds.Bottom) then + LineBounds.Bottom := UnderlinePos; + end; + + // add line offset + LineBounds.Bottom := LineBounds.Bottom + LineYOffset; + LineBounds.Top := LineBounds.Top + LineYOffset; + + // adjust global bounds + if (Result.Left > LineBounds.Left) then + Result.Left := LineBounds.Left; + if (Result.Right < LineBounds.Right) then + Result.Right := LineBounds.Right; + if (Result.Bottom > LineBounds.Bottom) then + Result.Bottom := LineBounds.Bottom; + if (Result.Top < LineBounds.Top) then + Result.Top := LineBounds.Top; + end; + + // if left or bottom bound was not set, set them to 0 + if (Result.Left = Infinity) then + Result.Left := 0.0; + if (Result.Bottom = Infinity) then + Result.Bottom := 0.0; +end; + +procedure TFTFont.Render(const Text: WideString); var CharIndex: integer; - Glyph, PrevGlyph: TFTGlyph;
- KernDelta: FT_Vector;
-begin
- // reset last glyph
- PrevGlyph := nil;
-
- // draw current line
- for CharIndex := 1 to Length(Text) do
- begin
- Glyph := TFTGlyph(GetGlyph(Text[CharIndex]));
- if (Assigned(Glyph)) then
- begin
- // get kerning
- if (fUseKerning and FT_HAS_KERNING(fFace) and (PrevGlyph <> nil)) then
- begin
- FT_Get_Kerning(fFace, PrevGlyph.CharIndex, Glyph.CharIndex,
- FT_KERNING_UNSCALED, KernDelta);
- glTranslatef(KernDelta.x * fFontUnitScale.X, 0, 0);
- end;
-
- if (ReflectionPass) then
- Glyph.RenderReflection()
- else
- Glyph.Render(fUseDisplayLists);
-
- glTranslatef(Glyph.Advance.x + fGlyphSpacing, 0, 0);
- end;
-
- PrevGlyph := Glyph;
- end;
-end;
- -function TFTFont.GetHeight(): single;
-begin
- Result := Ascender - Descender;
-end;
-
-function TFTFont.GetAscender(): single;
-begin
- Result := fFace.ascender * fFontUnitScale.Y + Outset*2;
-end;
-
-function TFTFont.GetDescender(): single;
-begin
- // Note: outset is not part of the descender as the baseline is lifted
- Result := fFace.descender * fFontUnitScale.Y;
-end;
-
-function TFTFont.GetUnderlinePosition(): single;
-begin
- Result := fFace.underline_position * fFontUnitScale.Y - Outset;
-end;
-
-function TFTFont.GetUnderlineThickness(): single;
-begin
- Result := fFace.underline_thickness * fFontUnitScale.Y + Outset*2;
-end;
-
-
-{*
- * TFTScalableFont
- *}
-
-constructor TFTScalableFont.Create(const Filename: string;
- Size: integer; OutsetAmount: single;
- UseMipmaps: boolean);
-var
- LoadFlags: FT_Int32;
-begin
- LoadFlags := FT_LOAD_DEFAULT;
- // Disable hinting and grid-fitting to preserve font outlines at each font
- // size, otherwise the font widths/heights do not match resulting in ugly
- // text size changes during zooming.
- // A drawback is a reduced quality with smaller font sizes but it is not that
- // bad with gray-scaled rendering (at least it looks better than OpenGL's
- // linear downscaling on minification).
- if (UseMipmaps) then
- LoadFlags := LoadFlags or FT_LOAD_NO_HINTING;
- inherited Create(
- TFTFont.Create(Filename, Size, Size * OutsetAmount, LoadFlags),
- UseMipmaps);
-end;
-
-function TFTScalableFont.CreateMipmap(Level: integer; Scale: single): TFont;
-var
- ScaledSize: integer;
- BaseFont: TFTFont;
-begin
- Result := nil;
- BaseFont := TFTFont(fBaseFont);
- ScaledSize := Round(BaseFont.Size * Scale);
- // do not create mipmap fonts < 8 pixels
- if (ScaledSize < 8) then
- Exit;
- Result := TFTFont.Create(BaseFont.fFilename,
- ScaledSize, BaseFont.fOutset * Scale,
- FT_LOAD_DEFAULT or FT_LOAD_NO_HINTING);
-end;
-
-function TFTScalableFont.GetOutset(): single;
-begin
- Result := TFTFont(fBaseFont).Outset * fScale;
-end;
-
-procedure TFTScalableFont.FlushCache(KeepBaseSet: boolean);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- TFTFont(fMipmapFonts[Level]).FlushCache(KeepBaseSet);
-end;
-
-
-{*
- * TOutlineFont
- *}
-
-constructor TFTOutlineFont.Create(
- const Filename: string;
- Size: integer; Outset: single;
- LoadFlags: FT_Int32);
-begin
- inherited Create();
-
- fFilename := Filename;
- fSize := Size;
- fOutset := Outset;
-
- fInnerFont := TFTFont.Create(Filename, Size, 0.0, LoadFlags);
- fOutlineFont := TFTFont.Create(Filename, Size, Outset, LoadFlags);
-
- ResetIntern();
-end;
-
-destructor TFTOutlineFont.Destroy;
-begin
- fOutlineFont.Free;
- fInnerFont.Free;
- inherited;
-end;
-
-procedure TFTOutlineFont.ResetIntern();
-begin
- // TODO: maybe swap fInnerFont/fOutlineFont.GlyphSpacing to use the spacing
- // of the outline font?
- //fInnerFont.GlyphSpacing := fOutset*2;
- fOutlineFont.GlyphSpacing := -fOutset*2;
-
- fLineSpacing := fOutlineFont.LineSpacing;
- fReflectionSpacing := fOutlineFont.ReflectionSpacing;
- fOutlineColor := NewGLColor(0, 0, 0, 1);
-end;
-
-procedure TFTOutlineFont.Reset();
-begin
- inherited;
- fInnerFont.Reset();
- fOutlineFont.Reset();
- ResetIntern();
-end;
-
-procedure TFTOutlineFont.DrawUnderline(const Text: WideString);
-begin
- glPushAttrib(GL_CURRENT_BIT);
- glColor4fv(@fOutlineColor.vals);
- fOutlineFont.DrawUnderline(Text);
- glPopAttrib();
-
- glPushMatrix();
- glTranslatef(fOutset, 0, 0);
- fInnerFont.DrawUnderline(Text);
- glPopMatrix();
-end;
-
-procedure TFTOutlineFont.Render(const Text: WideString);
-begin
- { setup and render outline font }
-
- // save old color
- glPushAttrib(GL_CURRENT_BIT);
- glColor4fv(@fOutlineColor.vals);
- glPushMatrix();
- fOutlineFont.Render(Text);
- glPopMatrix();
- glPopAttrib();
-
- { setup and render inner font }
-
- glPushMatrix();
- glTranslatef(fOutset, fOutset, 0);
- fInnerFont.Render(Text);
- glPopMatrix();
-end;
-
-procedure TFTOutlineFont.SetOutlineColor(r, g, b: GLfloat; a: GLfloat);
-begin
- fOutlineColor := NewGLColor(r, g, b, a);
-end;
-
-procedure TFTOutlineFont.FlushCache(KeepBaseSet: boolean);
-begin
- fOutlineFont.FlushCache(KeepBaseSet);
- fInnerFont.FlushCache(KeepBaseSet);
-end;
-
-function TFTOutlineFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-begin
- Result := fOutlineFont.BBox(Text, Advance);
-end;
-
-function TFTOutlineFont.GetHeight(): single;
-begin
- Result := fOutlineFont.Height;
-end;
-
-function TFTOutlineFont.GetAscender(): single;
-begin
- Result := fOutlineFont.Ascender;
-end;
-
-function TFTOutlineFont.GetDescender(): single;
-begin
- Result := fOutlineFont.Descender;
-end;
-
-procedure TFTOutlineFont.SetLineSpacing(Spacing: single);
-begin
- inherited SetLineSpacing(Spacing);
- fInnerFont.LineSpacing := Spacing;
- fOutlineFont.LineSpacing := Spacing;
-end;
-
-procedure TFTOutlineFont.SetGlyphSpacing(Spacing: single);
-begin
- inherited SetGlyphSpacing(Spacing);
- fInnerFont.GlyphSpacing := Spacing;
- fOutlineFont.GlyphSpacing := Spacing - Outset*2;
-end;
-
-procedure TFTOutlineFont.SetReflectionSpacing(Spacing: single);
-begin
- inherited SetReflectionSpacing(Spacing);
- fInnerFont.ReflectionSpacing := Spacing;
- fOutlineFont.ReflectionSpacing := Spacing;
-end;
-
-procedure TFTOutlineFont.SetStyle(Style: TFontStyle);
-begin
- inherited SetStyle(Style);
- fInnerFont.Style := Style;
- fOutlineFont.Style := Style;
-end;
-
-function TFTOutlineFont.GetStyle(): TFontStyle;
-begin
- Result := inherited GetStyle();
-end;
-
-function TFTOutlineFont.GetUnderlinePosition(): single;
-begin
- Result := fOutlineFont.GetUnderlinePosition();
-end;
-
-function TFTOutlineFont.GetUnderlineThickness(): single;
-begin
- Result := fOutlineFont.GetUnderlinePosition();
-end;
-
-procedure TFTOutlineFont.SetUseKerning(Enable: boolean);
-begin
- inherited SetUseKerning(Enable);
- fInnerFont.fUseKerning := Enable;
- fOutlineFont.fUseKerning := Enable;
-end;
-
-procedure TFTOutlineFont.SetReflectionPass(Enable: boolean);
-begin
- inherited SetReflectionPass(Enable);
- fInnerFont.fReflectionPass := Enable;
- fOutlineFont.fReflectionPass := Enable;
-end;
-
-{**
- * TScalableOutlineFont
- *}
-
-constructor TFTScalableOutlineFont.Create(
- const Filename: string;
- Size: integer; OutsetAmount: single;
- UseMipmaps: boolean);
-var
- LoadFlags: FT_Int32;
-begin
- LoadFlags := FT_LOAD_DEFAULT;
- // Disable hinting and grid-fitting (see TFTScalableFont.Create)
- if (UseMipmaps) then
- LoadFlags := LoadFlags or FT_LOAD_NO_HINTING;
- inherited Create(
- TFTOutlineFont.Create(Filename, Size, Size*OutsetAmount, LoadFlags),
- UseMipmaps);
-end;
-
-function TFTScalableOutlineFont.CreateMipmap(Level: integer; Scale: single): TFont;
-var
- ScaledSize: integer;
- BaseFont: TFTOutlineFont;
-begin
- Result := nil;
- BaseFont := TFTOutlineFont(fBaseFont);
- ScaledSize := Round(BaseFont.Size*Scale);
- // do not create mipmap fonts < 8 pixels
- if (ScaledSize < 8) then
- Exit;
- Result := TFTOutlineFont.Create(BaseFont.fFilename,
- ScaledSize, BaseFont.fOutset*Scale,
- FT_LOAD_DEFAULT or FT_LOAD_NO_HINTING);
-end;
-
-function TFTScalableOutlineFont.GetOutset(): single;
-begin
- Result := TFTOutlineFont(fBaseFont).Outset * fScale;
-end;
-
-procedure TFTScalableOutlineFont.SetOutlineColor(r, g, b: GLfloat; a: GLfloat);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- TFTOutlineFont(fMipmapFonts[Level]).SetOutlineColor(r, g, b, a);
-end;
-
-procedure TFTScalableOutlineFont.FlushCache(KeepBaseSet: boolean);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- TFTOutlineFont(fMipmapFonts[Level]).FlushCache(KeepBaseSet);
-end;
-
-
-{*
- * TFTGlyph
- *}
-
-const
- {**
- * Size of the transparent border surrounding the glyph image in the texture.
- * The border is necessary because OpenGL does not smooth texels at the
- * border of a texture with the GL_CLAMP or GL_CLAMP_TO_EDGE styles.
- * Without the border, magnified glyph textures look very ugly at their edges.
- * It looks edgy, as if some pixels are missing especially on the left edge
- * (just set cTexSmoothBorder to 0 to see what is meant by this).
- * With the border even the glyphs edges are blended to the border (transparent)
- * color and everything looks nice.
- *
- * Note:
- * OpenGL already supports texture border by setting the border parameter
- * of glTexImage*D() to 1 and using a texture size of 2^m+2b and setting the
- * border pixels to the border color. In some forums it is discouraged to use
- * the border parameter as only a few of the more modern graphics cards support
- * this feature. On an ATI Radeon 9700 card, the slowed down to 0.5 fps and
- * the glyph's background got black. So instead of using this feature we
- * handle it on our own. The only drawback is that textures might get bigger
- * because the border might require a higher power of 2 size instead of just
- * two additional pixels.
- *}
- cTexSmoothBorder = 1;
-
-procedure TFTGlyph.Extrude(var TexBuffer: TGLubyteDynArray; Outset: single);
-
- procedure SetToMax(var Val1: GLubyte; Val2: GLubyte); {$IFDEF HasInline}inline;{$ENDIF}
- begin
- if (Val1 < Val2) then
- Val1 := Val2;
- end;
-
-var
- I, X, Y: integer;
- SrcBuffer,TmpBuffer: TGLubyteDynArray;
- TexLine, TexLinePrev, TexLineNext: PGLubyteArray;
- SrcLine: PGLubyteArray;
- AlphaScale: single;
- Value, ValueNeigh, ValueDiag: GLubyte;
-const
- // square-root of 2 used for diagonal neighbor pixels
- cSqrt2 = 1.4142;
- // number of ignored pixels on each edge of the bitmap. Consists of:
- // - border used for font smoothing and
- // - outer (extruded) bitmap pixel (because it is just written but never read)
- cBorder = cTexSmoothBorder + 1;
-begin
- // allocate memory for temporary buffer
- SetLength(SrcBuffer, Length(TexBuffer));
- FillChar(SrcBuffer[0], Length(TexBuffer), 0);
-
- // extrude pixel by pixel
- for I := 1 to Ceil(Outset) do
- begin
- // swap arrays
- TmpBuffer := TexBuffer;
- TexBuffer := SrcBuffer;
- SrcBuffer := TmpBuffer;
-
- // as long as we add an entire pixel of outset, use a solid color.
- // If the fractional part is reached blend, e.g. outline=3.2 -> 3 solid
- // pixels and one blended with alpha=0.2.
- // For the fractional part I = Ceil(Outset) is always true.
- if (I <= Outset) then
- AlphaScale := 1
- else
- AlphaScale := Outset - Trunc(Outset);
-
- // copy data to the expanded bitmap.
- for Y := cBorder to fTexSize.Height - 2*cBorder do
- begin
- TexLine := @TexBuffer[Y*fTexSize.Width];
- TexLinePrev := @TexBuffer[(Y-1)*fTexSize.Width];
- TexLineNext := @TexBuffer[(Y+1)*fTexSize.Width];
- SrcLine := @SrcBuffer[Y*fTexSize.Width];
-
- // expand current line's pixels
- for X := cBorder to fTexSize.Width - 2*cBorder do
- begin
- Value := SrcLine[X];
- ValueNeigh := Round(Value * AlphaScale);
- ValueDiag := Round(ValueNeigh / cSqrt2);
-
- SetToMax(TexLine[X], Value);
- SetToMax(TexLine[X-1], ValueNeigh);
- SetToMax(TexLine[X+1], ValueNeigh);
-
- SetToMax(TexLinePrev[X], ValueNeigh);
- SetToMax(TexLinePrev[X-1], ValueDiag);
- SetToMax(TexLinePrev[X+1], ValueDiag);
-
- SetToMax(TexLineNext[X], ValueNeigh);
- SetToMax(TexLineNext[X-1], ValueDiag);
- SetToMax(TexLineNext[X+1], ValueDiag);
- end;
- end;
- end;
-
- TmpBuffer := nil;
- SetLength(SrcBuffer, 0);
-end;
-
-procedure TFTGlyph.CreateTexture(LoadFlags: FT_Int32);
-var
- X, Y: integer;
- Glyph: FT_Glyph;
- BitmapGlyph: FT_BitmapGlyph;
- Bitmap: PFT_Bitmap;
- BitmapLine: PChar;
- BitmapBuffer: PChar;
- TexBuffer: TGLubyteDynArray;
- TexLine: PGLubyteArray;
- CBox: FT_BBox;
-begin
- // load the Glyph for our character
- if (FT_Load_Glyph(fFont.Face, fCharIndex, LoadFlags) <> 0) then
- raise Exception.Create('FT_Load_Glyph failed');
-
- // move the face's glyph into a Glyph object
- if (FT_Get_Glyph(fFont.Face^.glyph, Glyph) <> 0) then
- raise Exception.Create('FT_Get_Glyph failed');
-
- // store scaled advance width/height in glyph-object
- fAdvance.X := fFont.Face^.glyph^.advance.x / 64 + fOutset*2;
- fAdvance.Y := fFont.Face^.glyph^.advance.y / 64 + fOutset*2;
-
- // get the contour's bounding box (in 1/64th pixels, not font-units)
- FT_Glyph_Get_CBox(Glyph, FT_GLYPH_BBOX_UNSCALED, CBox);
- // convert 1/64th values to double values
- fBounds.Left := CBox.xMin / 64;
- fBounds.Right := CBox.xMax / 64 + fOutset*2;
- fBounds.Bottom := CBox.yMin / 64;
- fBounds.Top := CBox.yMax / 64 + fOutset*2;
-
- // convert the glyph to a bitmap (and destroy original glyph image)
- FT_Glyph_To_Bitmap(Glyph, ft_render_mode_normal, nil, 1);
- BitmapGlyph := FT_BitmapGlyph(Glyph);
-
- // get bitmap offsets
- fBitmapCoords.Left := BitmapGlyph^.left - cTexSmoothBorder;
- // Note: add 1*fOutset for lifting the baseline so outset fonts to not intersect
- // with the baseline; Ceil(fOutset) for the outset pixels added to the bitmap.
- fBitmapCoords.Top := BitmapGlyph^.top + fOutset+Ceil(fOutset) + cTexSmoothBorder;
-
- // make accessing the bitmap easier
- Bitmap := @BitmapGlyph^.bitmap;
- // get bitmap dimensions
- fBitmapCoords.Width := Bitmap.width + (Ceil(fOutset) + cTexSmoothBorder)*2;
- fBitmapCoords.Height := Bitmap.rows + (Ceil(fOutset) + cTexSmoothBorder)*2;
-
- // get power-of-2 bitmap widths
- fTexSize.Width :=
- NextPowerOf2(Bitmap.width + (Ceil(fOutset) + cTexSmoothBorder)*2);
- fTexSize.Height :=
- NextPowerOf2(Bitmap.rows + (Ceil(fOutset) + cTexSmoothBorder)*2);
-
- // texture-widths ignoring empty (power-of-2) padding space
- fTexOffset.X := fBitmapCoords.Width / fTexSize.Width;
- fTexOffset.Y := fBitmapCoords.Height / fTexSize.Height;
-
- // allocate memory for texture data
- SetLength(TexBuffer, fTexSize.Width * fTexSize.Height);
- FillChar(TexBuffer[0], Length(TexBuffer), 0);
-
- // Freetype stores the bitmap with either upper (pitch is > 0) or lower
- // (pitch < 0) glyphs line first. Set the buffer to the upper line.
- // See http://freetype.sourceforge.net/freetype2/docs/glyphs/glyphs-7.html
- if (Bitmap.pitch > 0) then
- BitmapBuffer := @Bitmap.buffer[0]
- else
- BitmapBuffer := @Bitmap.buffer[(Bitmap.rows-1) * Abs(Bitmap.pitch)];
-
- // copy data to texture bitmap (upper line first).
- for Y := 0 to Bitmap.rows-1 do
- begin
- // set pointer to first pixel in line that holds bitmap data.
- // Each line starts with a cTexSmoothBorder pixel and multiple outset pixels
- // that are added by Extrude() later.
- TexLine := @TexBuffer[(Y + cTexSmoothBorder + Ceil(fOutset)) * fTexSize.Width +
- cTexSmoothBorder + Ceil(fOutset)];
- // get next lower line offset, use pitch instead of width as it tells
- // us the storage direction of the lines. In addition a line might be padded.
- BitmapLine := @BitmapBuffer[Y * Bitmap.pitch];
- for X := 0 to Bitmap.width-1 do
- TexLine[X] := GLubyte(BitmapLine[X]);
- end;
-
- if (fOutset > 0) then
- Extrude(TexBuffer, fOutset);
-
- // allocate resources for textures and display lists
- glGenTextures(1, @fTexture);
-
- // setup texture parameters
- glBindTexture(GL_TEXTURE_2D, fTexture);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- // create alpha-map (GL_ALPHA component only).
- // TexCoord (0,0) corresponds to the top left pixel of the glyph,
- // (1,1) to the bottom right pixel. So the glyph is flipped as OpenGL uses
- // a cartesian (y-axis up) coordinate system for textures.
- // See the cTexSmoothBorder comment for info on texture borders.
- glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, fTexSize.Width, fTexSize.Height,
- 0, GL_ALPHA, GL_UNSIGNED_BYTE, @TexBuffer[0]);
-
- // free expanded data
- SetLength(TexBuffer, 0);
-
- // create the display list
- fDisplayList := glGenLists(1);
-
- // render to display-list
- glNewList(fDisplayList, GL_COMPILE);
- Render(false);
- glEndList();
-
- // free glyph data (bitmap, etc.)
- FT_Done_Glyph(Glyph);
-end;
-
-constructor TFTGlyph.Create(Font: TFTFont; ch: WideChar; Outset: single;
- LoadFlags: FT_Int32);
-begin
- inherited Create();
-
- fFont := Font;
- fOutset := Outset;
-
- // get the Freetype char-index (use default UNICODE charmap)
- fCharIndex := FT_Get_Char_Index(Font.fFace, FT_ULONG(ch));
-
- CreateTexture(LoadFlags);
-end;
-
-destructor TFTGlyph.Destroy;
-begin
- if (fDisplayList <> 0) then
- glDeleteLists(fDisplayList, 1);
- if (fTexture <> 0) then
- glDeleteTextures(1, @fTexture);
- inherited;
-end;
-
-procedure TFTGlyph.Render(UseDisplayLists: boolean);
-begin
- // use display-lists if enabled and exit
- if (UseDisplayLists) then
- begin
- glCallList(fDisplayList);
- Exit;
- end;
-
- glBindTexture(GL_TEXTURE_2D, fTexture);
- glPushMatrix();
-
- // move to top left glyph position
- glTranslatef(fBitmapCoords.Left, fBitmapCoords.Top, 0);
-
- // draw glyph texture
- glBegin(GL_QUADS);
- // top right
- glTexCoord2f(fTexOffset.X, 0);
- glVertex2f(fBitmapCoords.Width, 0);
-
- // top left
- glTexCoord2f(0, 0);
- glVertex2f(0, 0);
-
- // bottom left
- glTexCoord2f(0, fTexOffset.Y);
- glVertex2f(0, -fBitmapCoords.Height);
-
- // bottom right
- glTexCoord2f(fTexOffset.X, fTexOffset.Y);
- glVertex2f(fBitmapCoords.Width, -fBitmapCoords.Height);
- glEnd();
-
- glPopMatrix();
-end;
-
-procedure TFTGlyph.RenderReflection();
-var
- Color: TGLColor;
- TexUpperPos: single;
- TexLowerPos: single;
- UpperPos: single;
-const
- CutOff = 0.6;
-begin
- glPushMatrix();
- glBindTexture(GL_TEXTURE_2D, fTexture);
- glGetFloatv(GL_CURRENT_COLOR, @Color.vals);
-
- // add extra space to the left of the glyph
- glTranslatef(fBitmapCoords.Left, 0, 0);
-
- // The upper position of the glyph, if CutOff is 1.0, it is fFont.Ascender.
- // If CutOff is set to 0.5 only half of the glyph height is displayed.
- UpperPos := fFont.Descender + fFont.Height * CutOff;
-
- // the glyph texture's height is just the height of the glyph but not the font
- // height. Setting a color for the upper and lower bounds of the glyph results
- // in different color gradients. So we have to set the color values for the
- // descender and ascender (as we have a cutoff, for the upper-pos here) as
- // these positions are font but not glyph specific.
-
- // To get the texture positions we have to enhance the texture at the top and
- // bottom by the amount from the top to ascender (rather upper-pos here) and
- // from the bottom (Height-Top) to descender. Then we have to convert those
- // heights to texture coordinates by dividing by the bitmap Height and
- // removing the power-of-2 padding space by multiplying with fTexOffset.Y
- // (as fBitmapCoords.Height corresponds to fTexOffset.Y and not 1.0).
- TexUpperPos := -(UpperPos - fBitmapCoords.Top) / fBitmapCoords.Height * fTexOffset.Y;
- TexLowerPos := (-(fFont.Descender + fBitmapCoords.Height - fBitmapCoords.Top) /
- fBitmapCoords.Height + 1) * fTexOffset.Y;
-
- // draw glyph texture
- glBegin(GL_QUADS);
- // top right
- glColor4f(Color.r, Color.g, Color.b, 0);
- glTexCoord2f(fTexOffset.X, TexUpperPos);
- glVertex2f(fBitmapCoords.Width, UpperPos);
-
- // top left
- glTexCoord2f(0, TexUpperPos);
- glVertex2f(0, UpperPos);
-
- // bottom left
- glColor4f(Color.r, Color.g, Color.b, Color.a-0.3);
- glTexCoord2f(0, TexLowerPos);
- glVertex2f(0, fFont.Descender);
-
- // bottom right
- glTexCoord2f(fTexOffset.X, TexLowerPos);
- glVertex2f(fBitmapCoords.Width, fFont.Descender);
- glEnd();
-
- glPopMatrix();
-
- // restore old color
- // Note: glPopAttrib(GL_CURRENT_BIT)/glPopAttrib() is much slower then
- // glGetFloatv(GL_CURRENT_COLOR, ...)/glColor4fv(...)
- glColor4fv(@Color.vals);
-end;
-
-function TFTGlyph.GetAdvance(): TPositionDbl;
-begin
- Result := fAdvance;
-end;
-
-function TFTGlyph.GetBounds(): TBoundsDbl;
-begin
- Result := fBounds;
-end;
-
-
-{*
- * TGlyphCache
- *}
-
-constructor TGlyphCache.Create();
-begin
- inherited;
- fHash := TList.Create();
-end;
-
-destructor TGlyphCache.Destroy();
-begin
- // free cached glyphs
- FlushCache(false);
-
- // destroy TList
- fHash.Free;
-
- inherited;
-end;
-
-function TGlyphCache.FindGlyphTable(BaseCode: cardinal; out InsertPos: integer): PGlyphTable;
-var
- I: integer;
- Entry: TGlyphCacheHashEntry;
-begin
- Result := nil;
-
- for I := 0 to fHash.Count-1 do
- begin
- Entry := TGlyphCacheHashEntry(fHash[I]);
-
- if (Entry.BaseCode > BaseCode) then
- begin
- InsertPos := I;
- Exit;
- end;
-
- if (Entry.BaseCode = BaseCode) then
- begin
- InsertPos := I;
- Result := @Entry.GlyphTable;
- Exit;
- end;
- end;
-
- InsertPos := fHash.Count;
-end;
-
-function TGlyphCache.AddGlyph(ch: WideChar; const Glyph: TGlyph): boolean;
-var
- BaseCode: cardinal;
- GlyphCode: integer;
- InsertPos: integer;
- GlyphTable: PGlyphTable;
- Entry: TGlyphCacheHashEntry;
-begin
- Result := false;
-
- BaseCode := cardinal(ch) shr 8;
- GlyphTable := FindGlyphTable(BaseCode, InsertPos);
- if (GlyphTable = nil) then
- begin
- Entry := TGlyphCacheHashEntry.Create(BaseCode);
- GlyphTable := @Entry.GlyphTable;
- fHash.Insert(InsertPos, Entry);
- end;
-
- // get glyph table offset
- GlyphCode := cardinal(ch) and $FF;
- // insert glyph into table if not present
- if (GlyphTable[GlyphCode] = nil) then
- begin
- GlyphTable[GlyphCode] := Glyph;
- Result := true;
- end;
-end;
-
-procedure TGlyphCache.DeleteGlyph(ch: WideChar);
-var
- Table: PGlyphTable;
- TableIndex, GlyphIndex: integer;
- TableEmpty: boolean;
-begin
- // find table
- Table := FindGlyphTable(cardinal(ch) shr 8, TableIndex);
- if (Table = nil) then
- Exit;
-
- // find glyph
- GlyphIndex := cardinal(ch) and $FF;
- if (Table[GlyphIndex] <> nil) then
- begin
- // destroy glyph
- FreeAndNil(Table[GlyphIndex]);
-
- // check if table is empty
- TableEmpty := true;
- for GlyphIndex := 0 to High(Table^) do
- begin
- if (Table[GlyphIndex] <> nil) then
- begin
- TableEmpty := false;
- Break;
- end;
- end;
-
- // free empty table
- if (TableEmpty) then
- begin
- fHash.Delete(TableIndex);
- end;
- end;
-end;
-
-function TGlyphCache.GetGlyph(ch: WideChar): TGlyph;
-var
- InsertPos: integer;
- Table: PGlyphTable;
-begin
- Table := FindGlyphTable(cardinal(ch) shr 8, InsertPos);
- if (Table = nil) then
- Result := nil
- else
- Result := Table[cardinal(ch) and $FF];
-end;
-
-function TGlyphCache.HasGlyph(ch: WideChar): boolean;
-begin
- Result := (GetGlyph(ch) <> nil);
-end;
-
-procedure TGlyphCache.FlushCache(KeepBaseSet: boolean);
-var
- EntryIndex, TableIndex: integer;
- Entry: TGlyphCacheHashEntry;
-begin
- // destroy cached glyphs
- for EntryIndex := 0 to fHash.Count-1 do
- begin
- Entry := TGlyphCacheHashEntry(fHash[EntryIndex]);
-
- // the base set (0-255) has BaseCode 0 as the upper bytes are 0.
- if KeepBaseSet and (Entry.fBaseCode = 0) then
- Continue;
-
- for TableIndex := 0 to High(Entry.GlyphTable) do
- begin
- if (Entry.GlyphTable[TableIndex] <> nil) then
- FreeAndNil(Entry.GlyphTable[TableIndex]);
- end;
- FreeAndNil(Entry);
- end;
-end;
-
-
-{*
- * TGlyphCacheEntry
- *}
-
-constructor TGlyphCacheHashEntry.Create(BaseCode: cardinal);
-begin
- inherited Create();
- fBaseCode := BaseCode;
-end;
-
-
-{*
- * TFreeType
- *}
-
-class function TFreeType.GetLibrary(): FT_Library;
-begin
- if (LibraryInst = nil) then
- begin
- // initialize freetype
- if (FT_Init_FreeType(LibraryInst) <> 0) then
- raise Exception.Create('FT_Init_FreeType failed');
- end;
- Result := LibraryInst;
-end;
-
-class procedure TFreeType.FreeLibrary();
-begin
- if (LibraryInst <> nil) then
- FT_Done_FreeType(LibraryInst);
- LibraryInst := nil;
-end;
-
-
-{$IFDEF BITMAP_FONT}
-{*
- * TBitmapFont
- *}
-
-constructor TBitmapFont.Create(const Filename: string; Outline: integer;
- Baseline, Ascender, Descender: integer);
-begin
- inherited Create();
-
- fTex := Texture.LoadTexture(true, Filename, TEXTURE_TYPE_TRANSPARENT, 0);
- fTexSize := 1024;
- fOutline := Outline;
- fBaseline := Baseline;
- fAscender := Ascender;
- fDescender := Descender;
-
- LoadFontInfo(ChangeFileExt(Filename, '.dat'));
-
- ResetIntern();
-end;
-
-destructor TBitmapFont.Destroy();
-begin
- glDeleteTextures(1, @fTex.TexNum);
- inherited;
-end;
-
-procedure TBitmapFont.ResetIntern();
-begin
- fLineSpacing := Height;
-end;
-
-procedure TBitmapFont.Reset();
-begin
- inherited;
- ResetIntern();
-end;
-
-procedure TBitmapFont.CorrectWidths(WidthMult: real; WidthAdd: integer);
-var
- Count: integer;
-begin
- for Count := 0 to 255 do
- fWidths[Count] := Round(fWidths[Count] * WidthMult) + WidthAdd;
-end;
-
-procedure TBitmapFont.LoadFontInfo(const InfoFile: string);
-var
- Stream: TFileStream;
-begin
- FillChar(fWidths[0], Length(fWidths), 0);
-
- Stream := nil;
- try
- Stream := TFileStream.Create(InfoFile, fmOpenRead);
- Stream.Read(fWidths, 256);
- except
- raise Exception.Create('Could not read font info file ''' + InfoFile + '''');
- end;
- Stream.Free;
-end;
-
-function TBitmapFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-var
- LineIndex, CharIndex: integer;
- CharCode: cardinal;
- Line: WideString;
- LineWidth: double;
-begin
- Result.Left := 0;
- Result.Right := 0;
- Result.Top := Height;
- Result.Bottom := 0;
-
- for LineIndex := 0 to High(Text) do
- begin
- Line := Text[LineIndex];
- LineWidth := 0;
- for CharIndex := 1 to Length(Line) do
- begin
- CharCode := Ord(Line[CharIndex]);
- if (CharCode < Length(fWidths)) then
- LineWidth := LineWidth + fWidths[CharCode];
- end;
- if (LineWidth > Result.Right) then
- Result.Right := LineWidth;
- end;
-end;
-
-procedure TBitmapFont.RenderChar(ch: WideChar; var AdvanceX: real);
-var
- TexX, TexY: real;
- TexR, TexB: real;
- GlyphWidth: real;
- PL, PT: real;
- PR, PB: real;
- CharCode: cardinal;
-begin
- CharCode := Ord(ch);
- if (CharCode > High(fWidths)) then
- CharCode := 0;
-
- GlyphWidth := fWidths[CharCode];
-
- // set texture positions
- TexX := (CharCode mod 16) * 1/16 + 1/32 - (GlyphWidth/2 - fOutline)/fTexSize;
- TexY := (CharCode div 16) * 1/16 + {2 texels} 2/fTexSize;
- TexR := (CharCode mod 16) * 1/16 + 1/32 + (GlyphWidth/2 + fOutline)/fTexSize;
- TexB := (1 + CharCode div 16) * 1/16 - {2 texels} 2/fTexSize;
-
- // set vector positions
- PL := AdvanceX - fOutline;
- PR := PL + GlyphWidth + fOutline*2;
- PB := -fBaseline;
- PT := PB + fTexSize div 16;
-
- (*
- if (Font.Blend) then
- begin
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- end;
- *)
-
- glEnable(GL_TEXTURE_2D);
- glBindTexture(GL_TEXTURE_2D, fTex.TexNum);
-
- if (not ReflectionPass) then
- begin
- glBegin(GL_QUADS);
- glTexCoord2f(TexX, TexY); glVertex2f(PL, PT);
- glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
- glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
- glTexCoord2f(TexR, TexY); glVertex2f(PR, PT);
- glEnd;
- end
- else
- begin
- glDepthRange(0, 10);
- glDepthFunc(GL_LEQUAL);
- glEnable(GL_DEPTH_TEST);
-
- glBegin(GL_QUADS);
- glTexCoord2f(TexX, TexY); glVertex2f(PL, PT);
- glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
- glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
- glTexCoord2f(TexR, TexY); glVertex2f(PR, PT);
- glEnd;
-
- glBegin(GL_QUADS);
- glTexCoord2f(TexX, TexY); glVertex2f(PL, PT);
- glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
- glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
- glTexCoord2f(TexR, TexY); glVertex2f(PR, PT);
-
-(*
- glColor4f(fTempColor.r, fTempColor.g, fTempColor.b, 0.7);
- glTexCoord2f(TexX, TexB); glVertex3f(PL, PB, 0);
- glTexCoord2f(TexR, TexB); glVertex3f(PR, PB, 0);
-
- glColor4f(fTempColor.r, fTempColor.g, fTempColor.b, 0);
- glTexCoord2f(TexR, (TexY + TexB)/2); glVertex3f(PR, (PT + PB)/2, 0);
- glTexCoord2f(TexX, (TexY + TexB)/2); glVertex3f(PL, (PT + PB)/2, 0);
-*)
- glEnd;
-
- //write the colour back
- glColor4fv(@fTempColor);
-
- glDisable(GL_DEPTH_TEST);
- end; // reflection
-
- glDisable(GL_TEXTURE_2D);
- (*
- if (Font.Blend) then
- glDisable(GL_BLEND);
- *)
-
- AdvanceX := AdvanceX + GlyphWidth;
-end;
-
-procedure TBitmapFont.Render(const Text: WideString);
-var
- CharIndex: integer;
- AdvanceX: real;
-begin
- // if there is no text do nothing
- if (Text = '') then
- Exit;
-
- //Save the current color and alpha (for reflection)
- glGetFloatv(GL_CURRENT_COLOR, @fTempColor);
-
- AdvanceX := 0;
- for CharIndex := 1 to Length(Text) do
- begin
- RenderChar(Text[CharIndex], AdvanceX);
- end;
-end;
-
-function TBitmapFont.GetHeight(): single;
-begin
- Result := fAscender - fDescender;
-end;
-
-function TBitmapFont.GetAscender(): single;
-begin
- Result := fAscender;
-end;
-
-function TBitmapFont.GetDescender(): single;
-begin
- Result := fDescender;
-end;
-
-function TBitmapFont.GetUnderlinePosition(): single;
-begin
- Result := -2.0;
-end;
-
-function TBitmapFont.GetUnderlineThickness(): single;
-begin
- Result := 1.0;
-end;
-
-{$ENDIF BITMAP_FONT}
-
-
-initialization
-
-finalization
- TFreeType.FreeLibrary();
-
-end.
+ Glyph, PrevGlyph: TFTGlyph; + KernDelta: FT_Vector; +begin + // reset last glyph + PrevGlyph := nil; + + // draw current line + for CharIndex := 1 to Length(Text) do + begin + Glyph := TFTGlyph(GetGlyph(Text[CharIndex])); + if (Assigned(Glyph)) then + begin + // get kerning + if (fUseKerning and FT_HAS_KERNING(fFace) and (PrevGlyph <> nil)) then + begin + FT_Get_Kerning(fFace, PrevGlyph.CharIndex, Glyph.CharIndex, + FT_KERNING_UNSCALED, KernDelta); + glTranslatef(KernDelta.x * fFontUnitScale.X, 0, 0); + end; + + if (ReflectionPass) then + Glyph.RenderReflection() + else + Glyph.Render(fUseDisplayLists); + + glTranslatef(Glyph.Advance.x + fGlyphSpacing, 0, 0); + end; + + PrevGlyph := Glyph; + end; +end; + +function TFTFont.GetHeight(): single; +begin + Result := Ascender - Descender; +end; + +function TFTFont.GetAscender(): single; +begin + Result := fFace.ascender * fFontUnitScale.Y + Outset*2; +end; + +function TFTFont.GetDescender(): single; +begin + // Note: outset is not part of the descender as the baseline is lifted + Result := fFace.descender * fFontUnitScale.Y; +end; + +function TFTFont.GetUnderlinePosition(): single; +begin + Result := fFace.underline_position * fFontUnitScale.Y - Outset; +end; + +function TFTFont.GetUnderlineThickness(): single; +begin + Result := fFace.underline_thickness * fFontUnitScale.Y + Outset*2; +end; + + +{* + * TFTScalableFont + *} + +constructor TFTScalableFont.Create(const Filename: string; + Size: integer; OutsetAmount: single; + UseMipmaps: boolean); +var + LoadFlags: FT_Int32; +begin + LoadFlags := FT_LOAD_DEFAULT; + // Disable hinting and grid-fitting to preserve font outlines at each font + // size, otherwise the font widths/heights do not match resulting in ugly + // text size changes during zooming. + // A drawback is a reduced quality with smaller font sizes but it is not that + // bad with gray-scaled rendering (at least it looks better than OpenGL's + // linear downscaling on minification). + if (UseMipmaps) then + LoadFlags := LoadFlags or FT_LOAD_NO_HINTING; + inherited Create( + TFTFont.Create(Filename, Size, Size * OutsetAmount, LoadFlags), + UseMipmaps); +end; + +function TFTScalableFont.CreateMipmap(Level: integer; Scale: single): TFont; +var + ScaledSize: integer; + BaseFont: TFTFont; +begin + Result := nil; + BaseFont := TFTFont(fBaseFont); + ScaledSize := Round(BaseFont.Size * Scale); + // do not create mipmap fonts < 8 pixels + if (ScaledSize < 8) then + Exit; + Result := TFTFont.Create(BaseFont.fFilename, + ScaledSize, BaseFont.fOutset * Scale, + FT_LOAD_DEFAULT or FT_LOAD_NO_HINTING); +end; + +function TFTScalableFont.GetOutset(): single; +begin + Result := TFTFont(fBaseFont).Outset * fScale; +end; + +procedure TFTScalableFont.FlushCache(KeepBaseSet: boolean); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + TFTFont(fMipmapFonts[Level]).FlushCache(KeepBaseSet); +end; + + +{* + * TOutlineFont + *} + +constructor TFTOutlineFont.Create( + const Filename: string; + Size: integer; Outset: single; + LoadFlags: FT_Int32); +begin + inherited Create(); + + fFilename := Filename; + fSize := Size; + fOutset := Outset; + + fInnerFont := TFTFont.Create(Filename, Size, 0.0, LoadFlags); + fOutlineFont := TFTFont.Create(Filename, Size, Outset, LoadFlags); + + ResetIntern(); +end; + +destructor TFTOutlineFont.Destroy; +begin + fOutlineFont.Free; + fInnerFont.Free; + inherited; +end; + +procedure TFTOutlineFont.ResetIntern(); +begin + // TODO: maybe swap fInnerFont/fOutlineFont.GlyphSpacing to use the spacing + // of the outline font? + //fInnerFont.GlyphSpacing := fOutset*2; + fOutlineFont.GlyphSpacing := -fOutset*2; + + fLineSpacing := fOutlineFont.LineSpacing; + fReflectionSpacing := fOutlineFont.ReflectionSpacing; + fOutlineColor := NewGLColor(0, 0, 0, -1); +end; + +procedure TFTOutlineFont.Reset(); +begin + inherited; + fInnerFont.Reset(); + fOutlineFont.Reset(); + ResetIntern(); +end; + +procedure TFTOutlineFont.DrawUnderline(const Text: WideString); +var + CurrentColor: TGLColor; + OutlineColor: TGLColor; +begin + // save current color + glGetFloatv(GL_CURRENT_COLOR, @CurrentColor.vals); + + // if the outline's alpha component is < 0 use the current alpha + OutlineColor := fOutlineColor; + if (OutlineColor.a < 0) then + OutlineColor.a := CurrentColor.a; + + // draw underline outline (in outline color) + glColor4fv(@OutlineColor.vals); + fOutlineFont.DrawUnderline(Text); + glColor4fv(@CurrentColor.vals); + + // draw underline inner part (in current color) + glPushMatrix(); + glTranslatef(fOutset, 0, 0); + fInnerFont.DrawUnderline(Text); + glPopMatrix(); +end; + +procedure TFTOutlineFont.Render(const Text: WideString); +var + CurrentColor: TGLColor; + OutlineColor: TGLColor; +begin + // save current color + glGetFloatv(GL_CURRENT_COLOR, @CurrentColor.vals); + + // if the outline's alpha component is < 0 use the current alpha + OutlineColor := fOutlineColor; + if (OutlineColor.a < 0) then + OutlineColor.a := CurrentColor.a; + + { setup and render outline font } + + glColor4fv(@OutlineColor.vals); + glPushMatrix(); + fOutlineFont.Render(Text); + glPopMatrix(); + glColor4fv(@CurrentColor.vals); + + { setup and render inner font } + + glPushMatrix(); + glTranslatef(fOutset, fOutset, 0); + fInnerFont.Render(Text); + glPopMatrix(); +end; + +procedure TFTOutlineFont.SetOutlineColor(r, g, b: GLfloat; a: GLfloat); +begin + fOutlineColor := NewGLColor(r, g, b, a); +end; + +procedure TFTOutlineFont.FlushCache(KeepBaseSet: boolean); +begin + fOutlineFont.FlushCache(KeepBaseSet); + fInnerFont.FlushCache(KeepBaseSet); +end; + +function TFTOutlineFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; +begin + Result := fOutlineFont.BBox(Text, Advance); +end; + +function TFTOutlineFont.GetHeight(): single; +begin + Result := fOutlineFont.Height; +end; + +function TFTOutlineFont.GetAscender(): single; +begin + Result := fOutlineFont.Ascender; +end; + +function TFTOutlineFont.GetDescender(): single; +begin + Result := fOutlineFont.Descender; +end; + +procedure TFTOutlineFont.SetLineSpacing(Spacing: single); +begin + inherited SetLineSpacing(Spacing); + fInnerFont.LineSpacing := Spacing; + fOutlineFont.LineSpacing := Spacing; +end; + +procedure TFTOutlineFont.SetGlyphSpacing(Spacing: single); +begin + inherited SetGlyphSpacing(Spacing); + fInnerFont.GlyphSpacing := Spacing; + fOutlineFont.GlyphSpacing := Spacing - Outset*2; +end; + +procedure TFTOutlineFont.SetReflectionSpacing(Spacing: single); +begin + inherited SetReflectionSpacing(Spacing); + fInnerFont.ReflectionSpacing := Spacing; + fOutlineFont.ReflectionSpacing := Spacing; +end; + +procedure TFTOutlineFont.SetStyle(Style: TFontStyle); +begin + inherited SetStyle(Style); + fInnerFont.Style := Style; + fOutlineFont.Style := Style; +end; + +function TFTOutlineFont.GetStyle(): TFontStyle; +begin + Result := inherited GetStyle(); +end; + +function TFTOutlineFont.GetUnderlinePosition(): single; +begin + Result := fOutlineFont.GetUnderlinePosition(); +end; + +function TFTOutlineFont.GetUnderlineThickness(): single; +begin + Result := fOutlineFont.GetUnderlinePosition(); +end; + +procedure TFTOutlineFont.SetUseKerning(Enable: boolean); +begin + inherited SetUseKerning(Enable); + fInnerFont.fUseKerning := Enable; + fOutlineFont.fUseKerning := Enable; +end; + +procedure TFTOutlineFont.SetReflectionPass(Enable: boolean); +begin + inherited SetReflectionPass(Enable); + fInnerFont.fReflectionPass := Enable; + fOutlineFont.fReflectionPass := Enable; +end; + +{** + * TScalableOutlineFont + *} + +constructor TFTScalableOutlineFont.Create( + const Filename: string; + Size: integer; OutsetAmount: single; + UseMipmaps: boolean); +var + LoadFlags: FT_Int32; +begin + LoadFlags := FT_LOAD_DEFAULT; + // Disable hinting and grid-fitting (see TFTScalableFont.Create) + if (UseMipmaps) then + LoadFlags := LoadFlags or FT_LOAD_NO_HINTING; + inherited Create( + TFTOutlineFont.Create(Filename, Size, Size*OutsetAmount, LoadFlags), + UseMipmaps); +end; + +function TFTScalableOutlineFont.CreateMipmap(Level: integer; Scale: single): TFont; +var + ScaledSize: integer; + BaseFont: TFTOutlineFont; +begin + Result := nil; + BaseFont := TFTOutlineFont(fBaseFont); + ScaledSize := Round(BaseFont.Size*Scale); + // do not create mipmap fonts < 8 pixels + if (ScaledSize < 8) then + Exit; + Result := TFTOutlineFont.Create(BaseFont.fFilename, + ScaledSize, BaseFont.fOutset*Scale, + FT_LOAD_DEFAULT or FT_LOAD_NO_HINTING); +end; + +function TFTScalableOutlineFont.GetOutset(): single; +begin + Result := TFTOutlineFont(fBaseFont).Outset * fScale; +end; + +procedure TFTScalableOutlineFont.SetOutlineColor(r, g, b: GLfloat; a: GLfloat); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + TFTOutlineFont(fMipmapFonts[Level]).SetOutlineColor(r, g, b, a); +end; + +procedure TFTScalableOutlineFont.FlushCache(KeepBaseSet: boolean); +var + Level: integer; +begin + for Level := 0 to High(fMipmapFonts) do + if (fMipmapFonts[Level] <> nil) then + TFTOutlineFont(fMipmapFonts[Level]).FlushCache(KeepBaseSet); +end; + + +{* + * TFTGlyph + *} + +const + {** + * Size of the transparent border surrounding the glyph image in the texture. + * The border is necessary because OpenGL does not smooth texels at the + * border of a texture with the GL_CLAMP or GL_CLAMP_TO_EDGE styles. + * Without the border, magnified glyph textures look very ugly at their edges. + * It looks edgy, as if some pixels are missing especially on the left edge + * (just set cTexSmoothBorder to 0 to see what is meant by this). + * With the border even the glyphs edges are blended to the border (transparent) + * color and everything looks nice. + * + * Note: + * OpenGL already supports texture border by setting the border parameter + * of glTexImage*D() to 1 and using a texture size of 2^m+2b and setting the + * border pixels to the border color. In some forums it is discouraged to use + * the border parameter as only a few of the more modern graphics cards support + * this feature. On an ATI Radeon 9700 card, the slowed down to 0.5 fps and + * the glyph's background got black. So instead of using this feature we + * handle it on our own. The only drawback is that textures might get bigger + * because the border might require a higher power of 2 size instead of just + * two additional pixels. + *} + cTexSmoothBorder = 1; + +procedure TFTGlyph.Extrude(var TexBuffer: TGLubyteDynArray; Outset: single); + + procedure SetToMax(var Val1: GLubyte; Val2: GLubyte); {$IFDEF HasInline}inline;{$ENDIF} + begin + if (Val1 < Val2) then + Val1 := Val2; + end; + +var + I, X, Y: integer; + SrcBuffer,TmpBuffer: TGLubyteDynArray; + TexLine, TexLinePrev, TexLineNext: PGLubyteArray; + SrcLine: PGLubyteArray; + AlphaScale: single; + Value, ValueNeigh, ValueDiag: GLubyte; +const + // square-root of 2 used for diagonal neighbor pixels + cSqrt2 = 1.4142; + // number of ignored pixels on each edge of the bitmap. Consists of: + // - border used for font smoothing and + // - outer (extruded) bitmap pixel (because it is just written but never read) + cBorder = cTexSmoothBorder + 1; +begin + // allocate memory for temporary buffer + SetLength(SrcBuffer, Length(TexBuffer)); + FillChar(SrcBuffer[0], Length(TexBuffer), 0); + + // extrude pixel by pixel + for I := 1 to Ceil(Outset) do + begin + // swap arrays + TmpBuffer := TexBuffer; + TexBuffer := SrcBuffer; + SrcBuffer := TmpBuffer; + + // as long as we add an entire pixel of outset, use a solid color. + // If the fractional part is reached blend, e.g. outline=3.2 -> 3 solid + // pixels and one blended with alpha=0.2. + // For the fractional part I = Ceil(Outset) is always true. + if (I <= Outset) then + AlphaScale := 1 + else + AlphaScale := Outset - Trunc(Outset); + + // copy data to the expanded bitmap. + for Y := cBorder to fTexSize.Height - 2*cBorder do + begin + TexLine := @TexBuffer[Y*fTexSize.Width]; + TexLinePrev := @TexBuffer[(Y-1)*fTexSize.Width]; + TexLineNext := @TexBuffer[(Y+1)*fTexSize.Width]; + SrcLine := @SrcBuffer[Y*fTexSize.Width]; + + // expand current line's pixels + for X := cBorder to fTexSize.Width - 2*cBorder do + begin + Value := SrcLine[X]; + ValueNeigh := Round(Value * AlphaScale); + ValueDiag := Round(ValueNeigh / cSqrt2); + + SetToMax(TexLine[X], Value); + SetToMax(TexLine[X-1], ValueNeigh); + SetToMax(TexLine[X+1], ValueNeigh); + + SetToMax(TexLinePrev[X], ValueNeigh); + SetToMax(TexLinePrev[X-1], ValueDiag); + SetToMax(TexLinePrev[X+1], ValueDiag); + + SetToMax(TexLineNext[X], ValueNeigh); + SetToMax(TexLineNext[X-1], ValueDiag); + SetToMax(TexLineNext[X+1], ValueDiag); + end; + end; + end; + + TmpBuffer := nil; + SetLength(SrcBuffer, 0); +end; + +procedure TFTGlyph.CreateTexture(LoadFlags: FT_Int32); +var + X, Y: integer; + Glyph: FT_Glyph; + BitmapGlyph: FT_BitmapGlyph; + Bitmap: PFT_Bitmap; + BitmapLine: PChar; + BitmapBuffer: PChar; + TexBuffer: TGLubyteDynArray; + TexLine: PGLubyteArray; + CBox: FT_BBox; +begin + // load the Glyph for our character + if (FT_Load_Glyph(fFont.Face, fCharIndex, LoadFlags) <> 0) then + raise Exception.Create('FT_Load_Glyph failed'); + + // move the face's glyph into a Glyph object + if (FT_Get_Glyph(fFont.Face^.glyph, Glyph) <> 0) then + raise Exception.Create('FT_Get_Glyph failed'); + + // store scaled advance width/height in glyph-object + fAdvance.X := fFont.Face^.glyph^.advance.x / 64 + fOutset*2; + fAdvance.Y := fFont.Face^.glyph^.advance.y / 64 + fOutset*2; + + // get the contour's bounding box (in 1/64th pixels, not font-units) + FT_Glyph_Get_CBox(Glyph, FT_GLYPH_BBOX_UNSCALED, CBox); + // convert 1/64th values to double values + fBounds.Left := CBox.xMin / 64; + fBounds.Right := CBox.xMax / 64 + fOutset*2; + fBounds.Bottom := CBox.yMin / 64; + fBounds.Top := CBox.yMax / 64 + fOutset*2; + + // convert the glyph to a bitmap (and destroy original glyph image) + FT_Glyph_To_Bitmap(Glyph, ft_render_mode_normal, nil, 1); + BitmapGlyph := FT_BitmapGlyph(Glyph); + + // get bitmap offsets + fBitmapCoords.Left := BitmapGlyph^.left - cTexSmoothBorder; + // Note: add 1*fOutset for lifting the baseline so outset fonts to not intersect + // with the baseline; Ceil(fOutset) for the outset pixels added to the bitmap. + fBitmapCoords.Top := BitmapGlyph^.top + fOutset+Ceil(fOutset) + cTexSmoothBorder; + + // make accessing the bitmap easier + Bitmap := @BitmapGlyph^.bitmap; + // get bitmap dimensions + fBitmapCoords.Width := Bitmap.width + (Ceil(fOutset) + cTexSmoothBorder)*2; + fBitmapCoords.Height := Bitmap.rows + (Ceil(fOutset) + cTexSmoothBorder)*2; + + // get power-of-2 bitmap widths + fTexSize.Width := + NextPowerOf2(Bitmap.width + (Ceil(fOutset) + cTexSmoothBorder)*2); + fTexSize.Height := + NextPowerOf2(Bitmap.rows + (Ceil(fOutset) + cTexSmoothBorder)*2); + + // texture-widths ignoring empty (power-of-2) padding space + fTexOffset.X := fBitmapCoords.Width / fTexSize.Width; + fTexOffset.Y := fBitmapCoords.Height / fTexSize.Height; + + // allocate memory for texture data + SetLength(TexBuffer, fTexSize.Width * fTexSize.Height); + FillChar(TexBuffer[0], Length(TexBuffer), 0); + + // Freetype stores the bitmap with either upper (pitch is > 0) or lower + // (pitch < 0) glyphs line first. Set the buffer to the upper line. + // See http://freetype.sourceforge.net/freetype2/docs/glyphs/glyphs-7.html + if (Bitmap.pitch > 0) then + BitmapBuffer := @Bitmap.buffer[0] + else + BitmapBuffer := @Bitmap.buffer[(Bitmap.rows-1) * Abs(Bitmap.pitch)]; + + // copy data to texture bitmap (upper line first). + for Y := 0 to Bitmap.rows-1 do + begin + // set pointer to first pixel in line that holds bitmap data. + // Each line starts with a cTexSmoothBorder pixel and multiple outset pixels + // that are added by Extrude() later. + TexLine := @TexBuffer[(Y + cTexSmoothBorder + Ceil(fOutset)) * fTexSize.Width + + cTexSmoothBorder + Ceil(fOutset)]; + // get next lower line offset, use pitch instead of width as it tells + // us the storage direction of the lines. In addition a line might be padded. + BitmapLine := @BitmapBuffer[Y * Bitmap.pitch]; + for X := 0 to Bitmap.width-1 do + TexLine[X] := GLubyte(BitmapLine[X]); + end; + + if (fOutset > 0) then + Extrude(TexBuffer, fOutset); + + // allocate resources for textures and display lists + glGenTextures(1, @fTexture); + + // setup texture parameters + glBindTexture(GL_TEXTURE_2D, fTexture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + // create alpha-map (GL_ALPHA component only). + // TexCoord (0,0) corresponds to the top left pixel of the glyph, + // (1,1) to the bottom right pixel. So the glyph is flipped as OpenGL uses + // a cartesian (y-axis up) coordinate system for textures. + // See the cTexSmoothBorder comment for info on texture borders. + glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, fTexSize.Width, fTexSize.Height, + 0, GL_ALPHA, GL_UNSIGNED_BYTE, @TexBuffer[0]); + + // free expanded data + SetLength(TexBuffer, 0); + + // create the display list + fDisplayList := glGenLists(1); + + // render to display-list + glNewList(fDisplayList, GL_COMPILE); + Render(false); + glEndList(); + + // free glyph data (bitmap, etc.) + FT_Done_Glyph(Glyph); +end; + +constructor TFTGlyph.Create(Font: TFTFont; ch: WideChar; Outset: single; + LoadFlags: FT_Int32); +begin + inherited Create(); + + fFont := Font; + fOutset := Outset; + + // get the Freetype char-index (use default UNICODE charmap) + fCharIndex := FT_Get_Char_Index(Font.fFace, FT_ULONG(ch)); + + CreateTexture(LoadFlags); +end; + +destructor TFTGlyph.Destroy; +begin + if (fDisplayList <> 0) then + glDeleteLists(fDisplayList, 1); + if (fTexture <> 0) then + glDeleteTextures(1, @fTexture); + inherited; +end; + +procedure TFTGlyph.Render(UseDisplayLists: boolean); +begin + // use display-lists if enabled and exit + if (UseDisplayLists) then + begin + glCallList(fDisplayList); + Exit; + end; + + glBindTexture(GL_TEXTURE_2D, fTexture); + glPushMatrix(); + + // move to top left glyph position + glTranslatef(fBitmapCoords.Left, fBitmapCoords.Top, 0); + + // draw glyph texture + glBegin(GL_QUADS); + // top right + glTexCoord2f(fTexOffset.X, 0); + glVertex2f(fBitmapCoords.Width, 0); + + // top left + glTexCoord2f(0, 0); + glVertex2f(0, 0); + + // bottom left + glTexCoord2f(0, fTexOffset.Y); + glVertex2f(0, -fBitmapCoords.Height); + + // bottom right + glTexCoord2f(fTexOffset.X, fTexOffset.Y); + glVertex2f(fBitmapCoords.Width, -fBitmapCoords.Height); + glEnd(); + + glPopMatrix(); +end; + +procedure TFTGlyph.RenderReflection(); +var + Color: TGLColor; + TexUpperPos: single; + TexLowerPos: single; + UpperPos: single; +const + CutOff = 0.6; +begin + glPushMatrix(); + glBindTexture(GL_TEXTURE_2D, fTexture); + glGetFloatv(GL_CURRENT_COLOR, @Color.vals); + + // add extra space to the left of the glyph + glTranslatef(fBitmapCoords.Left, 0, 0); + + // The upper position of the glyph, if CutOff is 1.0, it is fFont.Ascender. + // If CutOff is set to 0.5 only half of the glyph height is displayed. + UpperPos := fFont.Descender + fFont.Height * CutOff; + + // the glyph texture's height is just the height of the glyph but not the font + // height. Setting a color for the upper and lower bounds of the glyph results + // in different color gradients. So we have to set the color values for the + // descender and ascender (as we have a cutoff, for the upper-pos here) as + // these positions are font but not glyph specific. + + // To get the texture positions we have to enhance the texture at the top and + // bottom by the amount from the top to ascender (rather upper-pos here) and + // from the bottom (Height-Top) to descender. Then we have to convert those + // heights to texture coordinates by dividing by the bitmap Height and + // removing the power-of-2 padding space by multiplying with fTexOffset.Y + // (as fBitmapCoords.Height corresponds to fTexOffset.Y and not 1.0). + TexUpperPos := -(UpperPos - fBitmapCoords.Top) / fBitmapCoords.Height * fTexOffset.Y; + TexLowerPos := (-(fFont.Descender + fBitmapCoords.Height - fBitmapCoords.Top) / + fBitmapCoords.Height + 1) * fTexOffset.Y; + + // draw glyph texture + glBegin(GL_QUADS); + // top right + glColor4f(Color.r, Color.g, Color.b, 0); + glTexCoord2f(fTexOffset.X, TexUpperPos); + glVertex2f(fBitmapCoords.Width, UpperPos); + + // top left + glTexCoord2f(0, TexUpperPos); + glVertex2f(0, UpperPos); + + // bottom left + glColor4f(Color.r, Color.g, Color.b, Color.a-0.3); + glTexCoord2f(0, TexLowerPos); + glVertex2f(0, fFont.Descender); + + // bottom right + glTexCoord2f(fTexOffset.X, TexLowerPos); + glVertex2f(fBitmapCoords.Width, fFont.Descender); + glEnd(); + + glPopMatrix(); + + // restore old color + // Note: glPopAttrib(GL_CURRENT_BIT)/glPopAttrib() is much slower then + // glGetFloatv(GL_CURRENT_COLOR, ...)/glColor4fv(...) + glColor4fv(@Color.vals); +end; + +function TFTGlyph.GetAdvance(): TPositionDbl; +begin + Result := fAdvance; +end; + +function TFTGlyph.GetBounds(): TBoundsDbl; +begin + Result := fBounds; +end; + + +{* + * TGlyphCache + *} + +constructor TGlyphCache.Create(); +begin + inherited; + fHash := TList.Create(); +end; + +destructor TGlyphCache.Destroy(); +begin + // free cached glyphs + FlushCache(false); + + // destroy TList + fHash.Free; + + inherited; +end; + +function TGlyphCache.FindGlyphTable(BaseCode: cardinal; out InsertPos: integer): PGlyphTable; +var + I: integer; + Entry: TGlyphCacheHashEntry; +begin + Result := nil; + + for I := 0 to fHash.Count-1 do + begin + Entry := TGlyphCacheHashEntry(fHash[I]); + + if (Entry.BaseCode > BaseCode) then + begin + InsertPos := I; + Exit; + end; + + if (Entry.BaseCode = BaseCode) then + begin + InsertPos := I; + Result := @Entry.GlyphTable; + Exit; + end; + end; + + InsertPos := fHash.Count; +end; + +function TGlyphCache.AddGlyph(ch: WideChar; const Glyph: TGlyph): boolean; +var + BaseCode: cardinal; + GlyphCode: integer; + InsertPos: integer; + GlyphTable: PGlyphTable; + Entry: TGlyphCacheHashEntry; +begin + Result := false; + + BaseCode := cardinal(ch) shr 8; + GlyphTable := FindGlyphTable(BaseCode, InsertPos); + if (GlyphTable = nil) then + begin + Entry := TGlyphCacheHashEntry.Create(BaseCode); + GlyphTable := @Entry.GlyphTable; + fHash.Insert(InsertPos, Entry); + end; + + // get glyph table offset + GlyphCode := cardinal(ch) and $FF; + // insert glyph into table if not present + if (GlyphTable[GlyphCode] = nil) then + begin + GlyphTable[GlyphCode] := Glyph; + Result := true; + end; +end; + +procedure TGlyphCache.DeleteGlyph(ch: WideChar); +var + Table: PGlyphTable; + TableIndex, GlyphIndex: integer; + TableEmpty: boolean; +begin + // find table + Table := FindGlyphTable(cardinal(ch) shr 8, TableIndex); + if (Table = nil) then + Exit; + + // find glyph + GlyphIndex := cardinal(ch) and $FF; + if (Table[GlyphIndex] <> nil) then + begin + // destroy glyph + FreeAndNil(Table[GlyphIndex]); + + // check if table is empty + TableEmpty := true; + for GlyphIndex := 0 to High(Table^) do + begin + if (Table[GlyphIndex] <> nil) then + begin + TableEmpty := false; + Break; + end; + end; + + // free empty table + if (TableEmpty) then + begin + fHash.Delete(TableIndex); + end; + end; +end; + +function TGlyphCache.GetGlyph(ch: WideChar): TGlyph; +var + InsertPos: integer; + Table: PGlyphTable; +begin + Table := FindGlyphTable(cardinal(ch) shr 8, InsertPos); + if (Table = nil) then + Result := nil + else + Result := Table[cardinal(ch) and $FF]; +end; + +function TGlyphCache.HasGlyph(ch: WideChar): boolean; +begin + Result := (GetGlyph(ch) <> nil); +end; + +procedure TGlyphCache.FlushCache(KeepBaseSet: boolean); +var + EntryIndex, TableIndex: integer; + Entry: TGlyphCacheHashEntry; +begin + // destroy cached glyphs + for EntryIndex := 0 to fHash.Count-1 do + begin + Entry := TGlyphCacheHashEntry(fHash[EntryIndex]); + + // the base set (0-255) has BaseCode 0 as the upper bytes are 0. + if KeepBaseSet and (Entry.fBaseCode = 0) then + Continue; + + for TableIndex := 0 to High(Entry.GlyphTable) do + begin + if (Entry.GlyphTable[TableIndex] <> nil) then + FreeAndNil(Entry.GlyphTable[TableIndex]); + end; + FreeAndNil(Entry); + end; +end; + + +{* + * TGlyphCacheEntry + *} + +constructor TGlyphCacheHashEntry.Create(BaseCode: cardinal); +begin + inherited Create(); + fBaseCode := BaseCode; +end; + + +{* + * TFreeType + *} + +class function TFreeType.GetLibrary(): FT_Library; +begin + if (LibraryInst = nil) then + begin + // initialize freetype + if (FT_Init_FreeType(LibraryInst) <> 0) then + raise Exception.Create('FT_Init_FreeType failed'); + end; + Result := LibraryInst; +end; + +class procedure TFreeType.FreeLibrary(); +begin + if (LibraryInst <> nil) then + FT_Done_FreeType(LibraryInst); + LibraryInst := nil; +end; + + +{$IFDEF BITMAP_FONT} +{* + * TBitmapFont + *} + +constructor TBitmapFont.Create(const Filename: string; Outline: integer; + Baseline, Ascender, Descender: integer); +begin + inherited Create(); + + fTex := Texture.LoadTexture(true, Filename, TEXTURE_TYPE_TRANSPARENT, 0); + fTexSize := 1024; + fOutline := Outline; + fBaseline := Baseline; + fAscender := Ascender; + fDescender := Descender; + + LoadFontInfo(ChangeFileExt(Filename, '.dat')); + + ResetIntern(); +end; + +destructor TBitmapFont.Destroy(); +begin + glDeleteTextures(1, @fTex.TexNum); + inherited; +end; + +procedure TBitmapFont.ResetIntern(); +begin + fLineSpacing := Height; +end; + +procedure TBitmapFont.Reset(); +begin + inherited; + ResetIntern(); +end; + +procedure TBitmapFont.CorrectWidths(WidthMult: real; WidthAdd: integer); +var + Count: integer; +begin + for Count := 0 to 255 do + fWidths[Count] := Round(fWidths[Count] * WidthMult) + WidthAdd; +end; + +procedure TBitmapFont.LoadFontInfo(const InfoFile: string); +var + Stream: TFileStream; +begin + FillChar(fWidths[0], Length(fWidths), 0); + + Stream := nil; + try + Stream := TFileStream.Create(InfoFile, fmOpenRead); + Stream.Read(fWidths, 256); + except + raise Exception.Create('Could not read font info file ''' + InfoFile + ''''); + end; + Stream.Free; +end; + +function TBitmapFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; +var + LineIndex, CharIndex: integer; + CharCode: cardinal; + Line: WideString; + LineWidth: double; +begin + Result.Left := 0; + Result.Right := 0; + Result.Top := Height; + Result.Bottom := 0; + + for LineIndex := 0 to High(Text) do + begin + Line := Text[LineIndex]; + LineWidth := 0; + for CharIndex := 1 to Length(Line) do + begin + CharCode := Ord(Line[CharIndex]); + if (CharCode < Length(fWidths)) then + LineWidth := LineWidth + fWidths[CharCode]; + end; + if (LineWidth > Result.Right) then + Result.Right := LineWidth; + end; +end; + +procedure TBitmapFont.RenderChar(ch: WideChar; var AdvanceX: real); +var + TexX, TexY: real; + TexR, TexB: real; + GlyphWidth: real; + PL, PT: real; + PR, PB: real; + CharCode: cardinal; +begin + CharCode := Ord(ch); + if (CharCode > High(fWidths)) then + CharCode := 0; + + GlyphWidth := fWidths[CharCode]; + + // set texture positions + TexX := (CharCode mod 16) * 1/16 + 1/32 - (GlyphWidth/2 - fOutline)/fTexSize; + TexY := (CharCode div 16) * 1/16 + {2 texels} 2/fTexSize; + TexR := (CharCode mod 16) * 1/16 + 1/32 + (GlyphWidth/2 + fOutline)/fTexSize; + TexB := (1 + CharCode div 16) * 1/16 - {2 texels} 2/fTexSize; + + // set vector positions + PL := AdvanceX - fOutline; + PR := PL + GlyphWidth + fOutline*2; + PB := -fBaseline; + PT := PB + fTexSize div 16; + + (* + if (Font.Blend) then + begin + glEnable(GL_BLEND); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + end; + *) + + glEnable(GL_TEXTURE_2D); + glBindTexture(GL_TEXTURE_2D, fTex.TexNum); + + if (not ReflectionPass) then + begin + glBegin(GL_QUADS); + glTexCoord2f(TexX, TexY); glVertex2f(PL, PT); + glTexCoord2f(TexX, TexB); glVertex2f(PL, PB); + glTexCoord2f(TexR, TexB); glVertex2f(PR, PB); + glTexCoord2f(TexR, TexY); glVertex2f(PR, PT); + glEnd; + end + else + begin + glDepthRange(0, 10); + glDepthFunc(GL_LEQUAL); + glEnable(GL_DEPTH_TEST); + + glBegin(GL_QUADS); + glTexCoord2f(TexX, TexY); glVertex2f(PL, PT); + glTexCoord2f(TexX, TexB); glVertex2f(PL, PB); + glTexCoord2f(TexR, TexB); glVertex2f(PR, PB); + glTexCoord2f(TexR, TexY); glVertex2f(PR, PT); + glEnd; + + glBegin(GL_QUADS); + glTexCoord2f(TexX, TexY); glVertex2f(PL, PT); + glTexCoord2f(TexX, TexB); glVertex2f(PL, PB); + glTexCoord2f(TexR, TexB); glVertex2f(PR, PB); + glTexCoord2f(TexR, TexY); glVertex2f(PR, PT); + +(* + glColor4f(fTempColor.r, fTempColor.g, fTempColor.b, 0.7); + glTexCoord2f(TexX, TexB); glVertex3f(PL, PB, 0); + glTexCoord2f(TexR, TexB); glVertex3f(PR, PB, 0); + + glColor4f(fTempColor.r, fTempColor.g, fTempColor.b, 0); + glTexCoord2f(TexR, (TexY + TexB)/2); glVertex3f(PR, (PT + PB)/2, 0); + glTexCoord2f(TexX, (TexY + TexB)/2); glVertex3f(PL, (PT + PB)/2, 0); +*) + glEnd; + + //write the colour back + glColor4fv(@fTempColor); + + glDisable(GL_DEPTH_TEST); + end; // reflection + + glDisable(GL_TEXTURE_2D); + (* + if (Font.Blend) then + glDisable(GL_BLEND); + *) + + AdvanceX := AdvanceX + GlyphWidth; +end; + +procedure TBitmapFont.Render(const Text: WideString); +var + CharIndex: integer; + AdvanceX: real; +begin + // if there is no text do nothing + if (Text = '') then + Exit; + + //Save the current color and alpha (for reflection) + glGetFloatv(GL_CURRENT_COLOR, @fTempColor); + + AdvanceX := 0; + for CharIndex := 1 to Length(Text) do + begin + RenderChar(Text[CharIndex], AdvanceX); + end; +end; + +function TBitmapFont.GetHeight(): single; +begin + Result := fAscender - fDescender; +end; + +function TBitmapFont.GetAscender(): single; +begin + Result := fAscender; +end; + +function TBitmapFont.GetDescender(): single; +begin + Result := fDescender; +end; + +function TBitmapFont.GetUnderlinePosition(): single; +begin + Result := -2.0; +end; + +function TBitmapFont.GetUnderlineThickness(): single; +begin + Result := 1.0; +end; + +{$ENDIF BITMAP_FONT} + + +initialization + +finalization + TFreeType.FreeLibrary(); + +end. |