diff options
Diffstat (limited to 'src/base')
| -rw-r--r-- | src/base/UFont.pas | 2646 |
1 files changed, 2646 insertions, 0 deletions
diff --git a/src/base/UFont.pas b/src/base/UFont.pas new file mode 100644 index 00000000..947a1c6f --- /dev/null +++ b/src/base/UFont.pas @@ -0,0 +1,2646 @@ +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;
+
+ {**
+ * 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);
+ {$ENDIF}
+
+ // display text
+ for LineIndex := 0 to High(Text) do
+ begin
+ glPushMatrix();
+
+ // move to baseline
+ glTranslatef(0, -LineSpacing*LineIndex, 0);
+
+ if ((Underline in Style) and not ReflectionPass) then
+ begin
+ glDisable(GL_TEXTURE_2D);
+ DrawUnderline(Text[LineIndex]);
+ glEnable(GL_TEXTURE_2D);
+ end;
+
+ // draw reflection
+ if (ReflectionPass) then
+ begin
+ // set reflection spacing
+ glTranslatef(0, -ReflectionSpacing, 0);
+ // flip y-axis
+ glScalef(1, -1, 1);
+ end;
+
+ // shear for italic effect
+ if (Italic in Style) then
+ glMultMatrixf(@cShearMatrix);
+
+ // render text line + Render(Text[LineIndex]);
+
+ glPopMatrix();
+ end;
+
+ // restore settings
+ {$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);
+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);
+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.
|