diff options
Diffstat (limited to '')
-rw-r--r-- | src/base/UFont.pas | 2798 |
1 files changed, 0 insertions, 2798 deletions
diff --git a/src/base/UFont.pas b/src/base/UFont.pas deleted file mode 100644 index 191e74d2..00000000 --- a/src/base/UFont.pas +++ /dev/null @@ -1,2798 +0,0 @@ -{* 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, - Math, - Classes, - SysUtils, - UUnicodeUtils, - {$IFDEF BITMAP_FONT} - UTexture, - {$ENDIF} - UPath; - -type - - PGLubyteArray = ^TGLubyteArray; - TGLubyteArray = array[0 .. (MaxInt div SizeOf(GLubyte))-1] of GLubyte; - TGLubyteDynArray = array of GLubyte; - - TUCS4StringArray = array of UCS4String; - - 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 UCS-4 encoded string - * @param Lines splitted UCS4String lines - *} - procedure SplitLines(const Text: UCS4String; var Lines: TUCS4StringArray); - - {** - * Print an array of UCS4Strings. 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: TUCS4StringArray); overload; virtual; - - {** - * Draws an underline. - *} - procedure DrawUnderline(const Text: UCS4String); virtual; - - {** - * Renders (one) line of text. - *} - procedure Render(const Text: UCS4String); 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: TUCS4StringArray; 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: UCS4String); overload; - {** UTF-16 version of @link(Print) } - procedure Print(const Text: WideString); overload; - {** UTF-8 version of @link(Print) } - procedure Print(const Text: UTF8String); 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: UCS4String; Advance: boolean = true): TBoundsDbl; overload; - {** UTF-16 version of @link(BBox) } - 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: UCS4String); override; - procedure Print(const Text: TUCS4StringArray); override; - function BBox(const Text: TUCS4StringArray; 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 UCS4Char - * 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 UCS4Char 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: UCS4Char; const Glyph: TGlyph): boolean; - - {** - * Removes the glyph with char-code ch from the cache. - *} - procedure DeleteGlyph(ch: UCS4Char); - - {** - * Removes the glyph with char-code ch from the cache. - *} - function GetGlyph(ch: UCS4Char): TGlyph; - - {** - * Checks if a glyph with char-code ch is cached. - *} - function HasGlyph(ch: UCS4Char): 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: UCS4Char): TGlyph; - - {** - * Callback to create (load) a glyph with char-code ch. - * Implemented by subclasses. - *} - function LoadGlyph(ch: UCS4Char): 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 - fCharCode: UCS4Char; //**< Char code - 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 StrokeBorder(var Glyph: FT_Glyph); - - {** - * 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: UCS4Char; 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; - - TFontPart = ( fpNone, fpInner, fpOutline ); - - {** - * Freetype font class. - *} - TFTFont = class(TCachedFont) - private - procedure ResetIntern(); - - protected - fFilename: IPath; //**< 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 - fPart: TFontPart; //**< indicates the part of an outline font - - {** @seealso TCachedFont.LoadGlyph } - function LoadGlyph(ch: UCS4Char): TGlyph; override; - - procedure Render(const Text: UCS4String); override; - function BBox(const Text: TUCS4StringArray; 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: IPath; - 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: IPath; - 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: IPath; - fSize: integer; - fOutset: single; - fInnerFont, fOutlineFont: TFTFont; - fOutlineColor: TGLColor; - - procedure ResetIntern(); - - protected - procedure DrawUnderline(const Text: UCS4String); override; - procedure Render(const Text: UCS4String); override; - function BBox(const Text: TUCS4StringArray; 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: IPath; - 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: IPath; - 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; - -{$IFDEF BITMAP_FONT} - - {** - * A bitmapped font loads it's glyphs from a bitmap and stores them in a - * texture. Unicode characters are not supported (but could be by supporting - * multiple textures each storing a subset of unicode glyphs). - * For backward compatibility only. - *} - TBitmapFont = class(TFont) - private - fTex: TTexture; - fTexSize: integer; - fBaseline: integer; - fAscender: integer; - fDescender: integer; - fWidths: array[0..255] of byte; //**< half widths - fOutline: integer; - fTempColor: TGLColor; //**< colours for the reflection - - procedure ResetIntern(); - - procedure RenderChar(ch: UCS4Char; var AdvanceX: real); - - {** - * Load font widths from an info file. - * @param InfoFile the name of the info (.dat) file - * @raises Exception if the file is corrupted - *} - procedure LoadFontInfo(const InfoFile: IPath); - - protected - procedure Render(const Text: UCS4String); override; - function BBox(const Text: TUCS4StringArray; Advance: boolean): TBoundsDbl; override; - - function GetHeight(): single; override; - function GetAscender(): single; override; - function GetDescender(): single; override; - function GetUnderlinePosition(): single; override; - function GetUnderlineThickness(): single; override; - - public - {** - * Creates a bitmapped font from image Filename and font width info - * loaded from the corresponding file with ending .dat. - * @param(Baseline y-coord of the baseline given in cartesian coords - * (y-axis up) and from the lower edge of the glyphs bounding box) - * @param(Ascender pixels from baseline to top of highest glyph) - *} - constructor Create(const Filename: IPath; Outline: integer; - Baseline, Ascender, Descender: integer); - destructor Destroy(); override; - - {** - * Corrects font widths provided by the info file. - * NewWidth := Width * WidthMult + WidthAdd - *} - procedure CorrectWidths(WidthMult: real; WidthAdd: integer); - - {** @seealso TFont.Reset } - procedure Reset(); override; - end; - -{$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: UCS4String; var Lines: TUCS4StringArray); -var - CharIndex: integer; - LineStart: integer; - LineLength: integer; - EOT: boolean; // End-Of-Text -begin - // split lines on newline - SetLength(Lines, 0); - EOT := false; - LineStart := 0; - - for CharIndex := 0 to High(Text) do - begin - // check for end of text (UCS4Strings are zero-terminated) - if (CharIndex = High(Text)) then - EOT := true; - - // check for newline (carriage return (#13)) or end of text - if (Text[CharIndex] = 13) or EOT then - begin - LineLength := CharIndex - LineStart; - // check if last character was a newline - if (EOT and (LineLength = 0)) then - Break; - - // copy line (even if LineLength is 0) - SetLength(Lines, Length(Lines)+1); - Lines[High(Lines)] := UCS4Copy(Text, LineStart, LineLength); - - LineStart := CharIndex+1; - end; - end; -end; - -function TFont.BBox(const Text: UCS4String; Advance: boolean): TBoundsDbl; -var - LineArray: TUCS4StringArray; -begin - SplitLines(Text, LineArray); - Result := BBox(LineArray, Advance); - SetLength(LineArray, 0); -end; - -function TFont.BBox(const Text: UTF8String; Advance: boolean): TBoundsDbl; -begin - Result := BBox(UTF8Decode(Text), Advance); -end; - -function TFont.BBox(const Text: WideString; Advance: boolean): TBoundsDbl; -begin - Result := BBox(WideStringToUCS4String(Text), Advance); -end; - -procedure TFont.Print(const Text: TUCS4StringArray); -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: UCS4String); -var - LineArray: TUCS4StringArray; -begin - SplitLines(Text, LineArray); - Print(LineArray); - SetLength(LineArray, 0); -end; - -procedure TFont.Print(const Text: UTF8String); -begin - Print(UTF8Decode(Text)); -end; - -procedure TFont.Print(const Text: WideString); -begin - Print(WideStringToUCS4String(Text)); -end; - -procedure TFont.DrawUnderline(const Text: UCS4String); -var - UnderlineY1, UnderlineY2: single; - Bounds: TBoundsDbl; -begin - 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 := 1; - if (Sqrt(Dist*Dist + Dist2*Dist2) <> 0) then - begin - WidthScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2); - end; - - // projected height ||(x1, y1) - (x1, y2)|| - Dist := (WinCoords[0][0] - WinCoords[2][0]); - Dist2 := (WinCoords[0][1] - WinCoords[2][1]); - - HeightScale := 1; - if (Sqrt(Dist*Dist + Dist2*Dist2) <> 0) then - begin - HeightScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2); - end; - - //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: TUCS4StringArray); -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: UCS4String); -begin - Assert(false, 'Unused TScalableFont.Render() was called'); -end; - -function TScalableFont.BBox(const Text: TUCS4StringArray; 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) AND (GetMipmapScale(Level) > 0)) 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: UCS4Char): 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: IPath; - Size: integer; Outset: single; - LoadFlags: FT_Int32); -var - ch: UCS4Char; -begin - inherited Create(); - - fFilename := Filename; - fSize := Size; - fOutset := Outset; - fLoadFlags := LoadFlags; - fUseDisplayLists := true; - fPart := fpNone; - - // load font information - if (FT_New_Face(TFreeType.GetLibrary(), PChar(Filename.ToNative), 0, fFace) <> 0) then - raise Exception.Create('FT_New_Face: Could not load font ''' + Filename.ToNative + ''''); - - // 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 ch := 32 to 126 do - fCache.AddGlyph(ch, TFTGlyph.Create(Self, ch, 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: UCS4Char): TGlyph; -begin - Result := TFTGlyph.Create(Self, ch, Outset, fLoadFlags); -end; - -function TFTFont.BBox(const Text: TUCS4StringArray; Advance: boolean): TBoundsDbl; -var - Glyph, PrevGlyph: TFTGlyph; - TextLine: UCS4String; - 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 := 0 to LengthUCS4(TextLine)-1 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 < LengthUCS4(TextLine)-1) or // not the last character - (TextLine[CharIndex] = Ord(' ')) 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 (IsInfinite(Result.Left)) then - Result.Left := 0.0; - if (IsInfinite(Result.Bottom)) then - Result.Bottom := 0.0; -end; - -procedure TFTFont.Render(const Text: UCS4String); -var - CharIndex: integer; - Glyph, PrevGlyph: TFTGlyph; - KernDelta: FT_Vector; -begin - // reset last glyph - PrevGlyph := nil; - - // draw current line - for CharIndex := 0 to LengthUCS4(Text)-1 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: IPath; - 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: IPath; - Size: integer; Outset: single; - LoadFlags: FT_Int32); -begin - inherited Create(); - - fFilename := Filename; - fSize := Size; - fOutset := Outset; - - fInnerFont := TFTFont.Create(Filename, Size, 0.0, LoadFlags); - fInnerFont.fPart := fpInner; - fOutlineFont := TFTFont.Create(Filename, Size, Outset, LoadFlags); - fOutlineFont.fPart := fpOutline; - - 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: UCS4String); -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: UCS4String); -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: TUCS4StringArray; 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: IPath; - 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.StrokeBorder(var Glyph: FT_Glyph); -var - Outline: PFT_Outline; - OuterStroker, InnerStroker: FT_Stroker; - OuterNumPoints, InnerNumPoints, GlyphNumPoints: FT_UInt; - OuterNumContours, InnerNumContours, GlyphNumContours: FT_UInt; - OuterBorder, InnerBorder: FT_StrokerBorder; - OutlineFlags: FT_Int; - UseStencil: boolean; -begin - // It is possible to extrude the borders of a glyph with FT_Glyph_Stroke - // but it will extrude the border to the outside and the inside of a glyph - // although we just want to extrude to the outside. - // FT_Glyph_StrokeBorder extrudes to the outside but also fills the interior - // (this is what we need for bold fonts). - // In both cases the inner font and outline font (border) will overlap. - // Normally this does not matter but it does if alpha blending is active. - // In this case if e.g. the inner color is set to white, the outline to red - // and alpha to 0.5 the inner part will not be white it will be pink. - - InnerStroker := nil; - OuterStroker := nil; - - // If we are to create the interior of an outlined font (fInner = true) - // we have to create two borders: - // - one extruded to the outside by fOutset pixels and - // - one extruded to the inside by almost 0 zero pixels. - // The second one is used as a stencil for the first one, clearing the - // interiour of the glyph. - // The stencil is not needed to create bold fonts. - UseStencil := (fFont.fPart = fpInner); - - Outline := @FT_OutlineGlyph(Glyph).outline; - - OuterBorder := FT_Outline_GetOutsideBorder(Outline); - if (OuterBorder = FT_STROKER_BORDER_LEFT) then - InnerBorder := FT_STROKER_BORDER_RIGHT - else - InnerBorder := FT_STROKER_BORDER_LEFT; - - { extrude outer border } - - if (FT_Stroker_New(Glyph.library_, OuterStroker) <> 0) then - raise Exception.Create('FT_Stroker_New failed!'); - FT_Stroker_Set( - OuterStroker, - Round(fOutset * 64), - FT_STROKER_LINECAP_ROUND, - FT_STROKER_LINEJOIN_BEVEL, - 0); - - // similar to FT_Glyph_StrokeBorder(inner = FT_FALSE) but it is possible to - // use FT_Stroker_ExportBorder() afterwards to combine inner and outer borders - if (FT_Stroker_ParseOutline(OuterStroker, Outline, FT_FALSE) <> 0) then - raise Exception.Create('FT_Stroker_ParseOutline failed!'); - - FT_Stroker_GetBorderCounts(OuterStroker, OuterBorder, OuterNumPoints, OuterNumContours); - - { extrude inner border (= stencil) } - - if (UseStencil) then - begin - if (FT_Stroker_New(Glyph.library_, InnerStroker) <> 0) then - raise Exception.Create('FT_Stroker_New failed!'); - FT_Stroker_Set( - InnerStroker, - 63, // extrude at most one pixel to avoid a black border - FT_STROKER_LINECAP_ROUND, - FT_STROKER_LINEJOIN_BEVEL, - 0); - - if (FT_Stroker_ParseOutline(InnerStroker, Outline, FT_FALSE) <> 0) then - raise Exception.Create('FT_Stroker_ParseOutline failed!'); - - FT_Stroker_GetBorderCounts(InnerStroker, InnerBorder, InnerNumPoints, InnerNumContours); - end else begin - InnerNumPoints := 0; - InnerNumContours := 0; - end; - - { combine borders (subtract: OuterBorder - InnerBorder) } - - GlyphNumPoints := InnerNumPoints + OuterNumPoints; - GlyphNumContours := InnerNumContours + OuterNumContours; - - // save flags before deletion (TODO: set them on the resulting outline) - OutlineFlags := Outline.flags; - - // resize glyph outline to hold inner and outer border - FT_Outline_Done(Glyph.Library_, Outline); - if (FT_Outline_New(Glyph.Library_, GlyphNumPoints, GlyphNumContours, Outline) <> 0) then - raise Exception.Create('FT_Outline_New failed!'); - - Outline.n_points := 0; - Outline.n_contours := 0; - - // add points to outline. The inner-border is used as a stencil. - FT_Stroker_ExportBorder(OuterStroker, OuterBorder, Outline); - if (UseStencil) then - FT_Stroker_ExportBorder(InnerStroker, InnerBorder, Outline); - if (FT_Outline_Check(outline) <> 0) then - raise Exception.Create('FT_Stroker_ExportBorder failed!'); - - if (InnerStroker <> nil) then - FT_Stroker_Done(InnerStroker); - if (OuterStroker <> nil) then - FT_Stroker_Done(OuterStroker); -end; - -procedure TFTGlyph.CreateTexture(LoadFlags: FT_Int32); -var - X, Y: integer; - Glyph: FT_Glyph; - BitmapGlyph: FT_BitmapGlyph; - Bitmap: PFT_Bitmap; - BitmapLine: PByteArray; - BitmapBuffer: PByteArray; - 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'); - - if (fOutset > 0) then - StrokeBorder(Glyph); - - // 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). - // Request 8 bit gray level pixel mode. - 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]; - - // check for pixel mode and copy pixels - // Should be 8 bit gray, but even with FT_RENDER_MODE_NORMAL, freetype - // sometimes (e.g. 16px sized japanese fonts) fallbacks to 1 bit pixels. - case (Bitmap.pixel_mode) of - FT_PIXEL_MODE_GRAY: begin // 8 bit gray - for X := 0 to Bitmap.width-1 do - TexLine[X] := BitmapLine[X]; - end; - FT_PIXEL_MODE_MONO: begin // 1 bit mono - for X := 0 to Bitmap.width-1 do - TexLine[X] := High(GLubyte) * ((BitmapLine[X div 8] shr (7-(X mod 8))) and $1); - end; - else begin - // unhandled pixel format - end; - end; - end; - - // 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: UCS4Char; Outset: single; - LoadFlags: FT_Int32); -begin - inherited Create(); - - fFont := Font; - fOutset := Outset; - fCharCode := ch; - - // 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: UCS4Char; const Glyph: TGlyph): boolean; -var - BaseCode: cardinal; - GlyphCode: integer; - InsertPos: integer; - GlyphTable: PGlyphTable; - Entry: TGlyphCacheHashEntry; -begin - Result := false; - - BaseCode := Ord(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 := Ord(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: UCS4Char); -var - Table: PGlyphTable; - TableIndex, GlyphIndex: integer; - TableEmpty: boolean; -begin - // find table - Table := FindGlyphTable(Ord(ch) shr 8, TableIndex); - if (Table = nil) then - Exit; - - // find glyph - GlyphIndex := Ord(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: UCS4Char): TGlyph; -var - InsertPos: integer; - Table: PGlyphTable; -begin - Table := FindGlyphTable(Ord(ch) shr 8, InsertPos); - if (Table = nil) then - Result := nil - else - Result := Table[Ord(ch) and $FF]; -end; - -function TGlyphCache.HasGlyph(ch: UCS4Char): boolean; -begin - Result := (GetGlyph(ch) <> nil); -end; - -procedure TGlyphCache.FlushCache(KeepBaseSet: boolean); -var - EntryIndex, TableIndex: integer; - Entry: TGlyphCacheHashEntry; -begin - // destroy cached glyphs - for EntryIndex := 0 to fHash.Count-1 do - begin - Entry := TGlyphCacheHashEntry(fHash[EntryIndex]); - - // the base set (0-255) has BaseCode 0 as the upper bytes are 0. - if KeepBaseSet and (Entry.fBaseCode = 0) then - Continue; - - for TableIndex := 0 to High(Entry.GlyphTable) do - begin - if (Entry.GlyphTable[TableIndex] <> nil) then - FreeAndNil(Entry.GlyphTable[TableIndex]); - end; - FreeAndNil(Entry); - end; -end; - - -{* - * TGlyphCacheEntry - *} - -constructor TGlyphCacheHashEntry.Create(BaseCode: cardinal); -begin - inherited Create(); - fBaseCode := BaseCode; -end; - - -{* - * TFreeType - *} - -class function TFreeType.GetLibrary(): FT_Library; -begin - if (LibraryInst = nil) then - begin - // initialize freetype - if (FT_Init_FreeType(LibraryInst) <> 0) then - raise Exception.Create('FT_Init_FreeType failed'); - end; - Result := LibraryInst; -end; - -class procedure TFreeType.FreeLibrary(); -begin - if (LibraryInst <> nil) then - FT_Done_FreeType(LibraryInst); - LibraryInst := nil; -end; - - -{$IFDEF BITMAP_FONT} -{* - * TBitmapFont - *} - -constructor TBitmapFont.Create(const Filename: IPath; 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(Filename.SetExtension('.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: IPath); -var - Stream: TStream; -begin - FillChar(fWidths[0], Length(fWidths), 0); - - Stream := nil; - try - Stream := TBinaryFileStream.Create(InfoFile, fmOpenRead); - Stream.Read(fWidths, 256); - except - raise Exception.Create('Could not read font info file ''' + InfoFile.ToNative + ''''); - end; - Stream.Free; -end; - -function TBitmapFont.BBox(const Text: TUCS4StringArray; Advance: boolean): TBoundsDbl; -var - LineIndex, CharIndex: integer; - CharCode: cardinal; - Line: UCS4String; - 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 := 0 to LengthUCS4(Line)-1 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: UCS4Char; 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: UCS4String); -var - CharIndex: integer; - AdvanceX: real; -begin - // if there is no text do nothing - if (Text = nil) or (Text[0] = 0) then - Exit; - - //Save the current color and alpha (for reflection) - glGetFloatv(GL_CURRENT_COLOR, @fTempColor); - - AdvanceX := 0; - for CharIndex := 0 to LengthUCS4(Text)-1 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. |