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-(***************************************************************************)
-(* *)
-(* ftglyph.h *)
-(* *)
-(* FreeType convenience functions to handle glyphs (specification). *)
-(* *)
-(* Copyright 1996-2001, 2002, 2003, 2006 by *)
-(* David Turner, Robert Wilhelm, and Werner Lemberg. *)
-(* *)
-(* This file is part of the FreeType project, and may only be used, *)
-(* modified, and distributed under the terms of the FreeType project *)
-(* license, LICENSE.TXT. By continuing to use, modify, or distribute *)
-(* this file you indicate that you have read the license and *)
-(* understand and accept it fully. *)
-(* *)
-(***************************************************************************)
-(***************************************************************************)
-(* Pascal port by the UltraStar Deluxe Team *)
-(***************************************************************************)
-
-
- (*************************************************************************)
- (* *)
- (* This file contains the definition of several convenience functions *)
- (* that can be used by client applications to easily retrieve glyph *)
- (* bitmaps and outlines from a given face. *)
- (* *)
- (* These functions should be optional if you are writing a font server *)
- (* or text layout engine on top of FreeType. However, they are pretty *)
- (* handy for many other simple uses of the library. *)
- (* *)
- (*************************************************************************)
-
- (*************************************************************************)
- (* *)
- (* <Section> *)
- (* glyph_management *)
- (* *)
- (* <Title> *)
- (* Glyph Management *)
- (* *)
- (* <Abstract> *)
- (* Generic interface to manage individual glyph data. *)
- (* *)
- (* <Description> *)
- (* This section contains definitions used to manage glyph data *)
- (* through generic FT_Glyph objects. Each of them can contain a *)
- (* bitmap, a vector outline, or even images in other formats. *)
- (* *)
- (*************************************************************************)
-
-{$IFDEF TYPE_DECL}
-
- (* forward declaration to a private type *)
- PFT_Glyph_Class = Pointer;
-
-
- (*************************************************************************)
- (* *)
- (* <Type> *)
- (* FT_Glyph *)
- (* *)
- (* <Description> *)
- (* Handle to an object used to model generic glyph images. It is a *)
- (* pointer to the @FT_GlyphRec structure and can contain a glyph *)
- (* bitmap or pointer. *)
- (* *)
- (* <Note> *)
- (* Glyph objects are not owned by the library. You must thus release *)
- (* them manually (through @FT_Done_Glyph) _before_ calling *)
- (* @FT_Done_FreeType. *)
- (* *)
- FT_Glyph = ^FT_GlyphRec;
-
- (*************************************************************************)
- (* *)
- (* <Struct> *)
- (* FT_GlyphRec *)
- (* *)
- (* <Description> *)
- (* The root glyph structure contains a given glyph image plus its *)
- (* advance width in 16.16 fixed float format. *)
- (* *)
- (* <Fields> *)
- (* library :: A handle to the FreeType library object. *)
- (* *)
- (* clazz :: A pointer to the glyph's class. Private. *)
- (* *)
- (* format :: The format of the glyph's image. *)
- (* *)
- (* advance :: A 16.16 vector that gives the glyph's advance width. *)
- (* *)
- FT_GlyphRec = record
- library_: FT_Library;
- clazz: PFT_Glyph_Class;
- format: FT_Glyph_Format;
- advance: FT_Vector;
- end;
-
-
- (*************************************************************************)
- (* *)
- (* <Type> *)
- (* FT_BitmapGlyph *)
- (* *)
- (* <Description> *)
- (* A handle to an object used to model a bitmap glyph image. This is *)
- (* a sub-class of @FT_Glyph, and a pointer to @FT_BitmapGlyphRec. *)
- (* *)
- FT_BitmapGlyph = ^FT_BitmapGlyphRec;
-
- (*************************************************************************)
- (* *)
- (* <Struct> *)
- (* FT_BitmapGlyphRec *)
- (* *)
- (* <Description> *)
- (* A structure used for bitmap glyph images. This really is a *)
- (* `sub-class' of `FT_GlyphRec'. *)
- (* *)
- (* <Fields> *)
- (* root :: The root FT_Glyph fields. *)
- (* *)
- (* left :: The left-side bearing, i.e., the horizontal distance *)
- (* from the current pen position to the left border of the *)
- (* glyph bitmap. *)
- (* *)
- (* top :: The top-side bearing, i.e., the vertical distance from *)
- (* the current pen position to the top border of the glyph *)
- (* bitmap. This distance is positive for upwards-y! *)
- (* *)
- (* bitmap :: A descriptor for the bitmap. *)
- (* *)
- (* <Note> *)
- (* You can typecast FT_Glyph to FT_BitmapGlyph if you have *)
- (* glyph->format == FT_GLYPH_FORMAT_BITMAP. This lets you access *)
- (* the bitmap's contents easily. *)
- (* *)
- (* The corresponding pixel buffer is always owned by the BitmapGlyph *)
- (* and is thus created and destroyed with it. *)
- (* *)
- FT_BitmapGlyphRec = record
- root: FT_GlyphRec;
- left: FT_Int;
- top: FT_Int;
- bitmap: FT_Bitmap;
- end;
-
-
- (*************************************************************************)
- (* *)
- (* <Type> *)
- (* FT_OutlineGlyph *)
- (* *)
- (* <Description> *)
- (* A handle to an object used to model an outline glyph image. This *)
- (* is a sub-class of @FT_Glyph, and a pointer to @FT_OutlineGlyphRec. *)
- (* *)
- FT_OutlineGlyph = ^FT_OutlineGlyphRec;
-
-
- (*************************************************************************)
- (* *)
- (* <Struct> *)
- (* FT_OutlineGlyphRec *)
- (* *)
- (* <Description> *)
- (* A structure used for outline (vectorial) glyph images. This *)
- (* really is a `sub-class' of `FT_GlyphRec'. *)
- (* *)
- (* <Fields> *)
- (* root :: The root FT_Glyph fields. *)
- (* *)
- (* outline :: A descriptor for the outline. *)
- (* *)
- (* <Note> *)
- (* You can typecast FT_Glyph to FT_OutlineGlyph if you have *)
- (* glyph->format == FT_GLYPH_FORMAT_OUTLINE. This lets you access *)
- (* the outline's content easily. *)
- (* *)
- (* As the outline is extracted from a glyph slot, its coordinates are *)
- (* expressed normally in 26.6 pixels, unless the flag *)
- (* FT_LOAD_NO_SCALE was used in FT_Load_Glyph() or FT_Load_Char(). *)
- (* *)
- (* The outline's tables are always owned by the object and are *)
- (* destroyed with it. *)
- (* *)
- FT_OutlineGlyphRec = record
- root: FT_GlyphRec;
- outline: FT_Outline;
- end;
-
-{$ELSE TYPE_DECL}
-
- (*************************************************************************)
- (* *)
- (* <Function> *)
- (* FT_Get_Glyph *)
- (* *)
- (* <Description> *)
- (* A function used to extract a glyph image from a slot. *)
- (* *)
- (* <Input> *)
- (* slot :: A handle to the source glyph slot. *)
- (* *)
- (* <Output> *)
- (* aglyph :: A handle to the glyph object. *)
- (* *)
- (* <Return> *)
- (* FreeType error code. 0 means success. *)
- (* *)
- function FT_Get_Glyph(
- slot: FT_GlyphSlot;
- out aglyph: FT_Glyph ): FT_Error;
- cdecl; external ft_lib name 'FT_Get_Glyph';
-
- (*************************************************************************)
- (* *)
- (* <Function> *)
- (* FT_Glyph_Copy *)
- (* *)
- (* <Description> *)
- (* A function used to copy a glyph image. Note that the created *)
- (* @FT_Glyph object must be released with @FT_Done_Glyph. *)
- (* *)
- (* <Input> *)
- (* source :: A handle to the source glyph object. *)
- (* *)
- (* <Output> *)
- (* target :: A handle to the target glyph object. 0~in case of *)
- (* error. *)
- (* *)
- (* <Return> *)
- (* FreeType error code. 0~means success. *)
- (* *)
- function FT_Glyph_Copy(source: FT_Glyph;
- var target: FT_Glyph ): FT_Error;
- cdecl; external ft_lib name 'FT_Glyph_Copy';
-
-{$ENDIF TYPE_DECL}
-{$IFDEF TYPE_DECL}
-
- (*************************************************************************)
- (* *)
- (* <Enum> *)
- (* FT_Glyph_BBox_Mode *)
- (* *)
- (* <Description> *)
- (* The mode how the values of @FT_Glyph_Get_CBox are returned. *)
- (* *)
- (* <Values> *)
- (* FT_GLYPH_BBOX_UNSCALED :: *)
- (* Return unscaled font units. *)
- (* *)
- (* FT_GLYPH_BBOX_SUBPIXELS :: *)
- (* Return unfitted 26.6 coordinates. *)
- (* *)
- (* FT_GLYPH_BBOX_GRIDFIT :: *)
- (* Return grid-fitted 26.6 coordinates. *)
- (* *)
- (* FT_GLYPH_BBOX_TRUNCATE :: *)
- (* Return coordinates in integer pixels. *)
- (* *)
- (* FT_GLYPH_BBOX_PIXELS :: *)
- (* Return grid-fitted pixel coordinates. *)
- (* *)
- FT_Glyph_BBox_Mode = cint;
-{$ELSE TYPE_DECL}
-const
- FT_GLYPH_BBOX_UNSCALED = 0;
- FT_GLYPH_BBOX_SUBPIXELS = 0;
- FT_GLYPH_BBOX_GRIDFIT = 1;
- FT_GLYPH_BBOX_TRUNCATE = 2;
- FT_GLYPH_BBOX_PIXELS = 3;
-
-
- (*************************************************************************)
- (* *)
- (* <Function> *)
- (* FT_Glyph_Get_CBox *)
- (* *)
- (* <Description> *)
- (* Return a glyph's `control box'. The control box encloses all the *)
- (* outline's points, including Bézier control points. Though it *)
- (* coincides with the exact bounding box for most glyphs, it can be *)
- (* slightly larger in some situations (like when rotating an outline *)
- (* which contains Bézier outside arcs). *)
- (* *)
- (* Computing the control box is very fast, while getting the bounding *)
- (* box can take much more time as it needs to walk over all segments *)
- (* and arcs in the outline. To get the latter, you can use the *)
- (* `ftbbox' component which is dedicated to this single task. *)
- (* *)
- (* <Input> *)
- (* glyph :: A handle to the source glyph object. *)
- (* *)
- (* mode :: The mode which indicates how to interpret the returned *)
- (* bounding box values. *)
- (* *)
- (* <Output> *)
- (* acbox :: The glyph coordinate bounding box. Coordinates are *)
- (* expressed in 1/64th of pixels if it is grid-fitted. *)
- (* *)
- (* <Note> *)
- (* Coordinates are relative to the glyph origin, using the Y-upwards *)
- (* convention. *)
- (* *)
- (* If the glyph has been loaded with @FT_LOAD_NO_SCALE, `bbox_mode' *)
- (* must be set to @FT_GLYPH_BBOX_UNSCALED to get unscaled font *)
- (* units in 26.6 pixel format. The value @FT_GLYPH_BBOX_SUBPIXELS *)
- (* is another name for this constant. *)
- (* *)
- (* Note that the maximum coordinates are exclusive, which means that *)
- (* one can compute the width and height of the glyph image (be it in *)
- (* integer or 26.6 pixels) as: *)
- (* *)
- (* { *)
- (* width = bbox.xMax - bbox.xMin; *)
- (* height = bbox.yMax - bbox.yMin; *)
- (* } *)
- (* *)
- (* Note also that for 26.6 coordinates, if `bbox_mode' is set to *)
- (* @FT_GLYPH_BBOX_GRIDFIT, the coordinates will also be grid-fitted, *)
- (* which corresponds to: *)
- (* *)
- (* { *)
- (* bbox.xMin = FLOOR(bbox.xMin); *)
- (* bbox.yMin = FLOOR(bbox.yMin); *)
- (* bbox.xMax = CEILING(bbox.xMax); *)
- (* bbox.yMax = CEILING(bbox.yMax); *)
- (* } *)
- (* *)
- (* To get the bbox in pixel coordinates, set `bbox_mode' to *)
- (* @FT_GLYPH_BBOX_TRUNCATE. *)
- (* *)
- (* To get the bbox in grid-fitted pixel coordinates, set `bbox_mode' *)
- (* to @FT_GLYPH_BBOX_PIXELS. *)
- (* *)
- procedure FT_Glyph_Get_CBox( glyph: FT_Glyph;
- bbox_mode: FT_UInt;
- out acbox: FT_BBox );
- cdecl; external ft_lib name 'FT_Glyph_Get_CBox';
-
-
- (*************************************************************************)
- (* *)
- (* <Function> *)
- (* FT_Glyph_To_Bitmap *)
- (* *)
- (* <Description> *)
- (* Converts a given glyph object to a bitmap glyph object. *)
- (* *)
- (* <InOut> *)
- (* the_glyph :: A pointer to a handle to the target glyph. *)
- (* *)
- (* <Input> *)
- (* render_mode :: An enumeration that describe how the data is *)
- (* rendered. *)
- (* *)
- (* origin :: A pointer to a vector used to translate the glyph *)
- (* image before rendering. Can be 0 (if no *)
- (* translation). The origin is expressed in *)
- (* 26.6 pixels. *)
- (* *)
- (* destroy :: A boolean that indicates that the original glyph *)
- (* image should be destroyed by this function. It is *)
- (* never destroyed in case of error. *)
- (* *)
- (* <Return> *)
- (* FreeType error code. 0 means success. *)
- (* *)
- (* <Note> *)
- (* The glyph image is translated with the `origin' vector before *)
- (* rendering. *)
- (* *)
- (* The first parameter is a pointer to a FT_Glyph handle, that will *)
- (* be replaced by this function. Typically, you would use (omitting *)
- (* error handling): *)
- (* *)
- (* *)
- (* { *)
- (* FT_Glyph glyph; *)
- (* FT_BitmapGlyph glyph_bitmap; *)
- (* *)
- (* *)
- (* // load glyph *)
- (* error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT ); *)
- (* *)
- (* // extract glyph image *)
- (* error = FT_Get_Glyph( face->glyph, &glyph ); *)
- (* *)
- (* // convert to a bitmap (default render mode + destroy old) *)
- (* if ( glyph->format != FT_GLYPH_FORMAT_BITMAP ) *)
- (* { *)
- (* error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_DEFAULT, *)
- (* 0, 1 ); *)
- (* if ( error ) // glyph unchanged *)
- (* ... *)
- (* } *)
- (* *)
- (* // access bitmap content by typecasting *)
- (* glyph_bitmap = (FT_BitmapGlyph)glyph; *)
- (* *)
- (* // do funny stuff with it, like blitting/drawing *)
- (* ... *)
- (* *)
- (* // discard glyph image (bitmap or not) *)
- (* FT_Done_Glyph( glyph ); *)
- (* } *)
- (* *)
- (* *)
- (* This function does nothing if the glyph format isn't scalable. *)
- (* *)
- function FT_Glyph_To_Bitmap(var the_glyph: FT_Glyph;
- render_mode: FT_Render_Mode;
- origin: PFT_Vector;
- destroy: FT_Bool ): FT_Error;
- cdecl; external ft_lib name 'FT_Glyph_To_Bitmap';
-
-
- (*************************************************************************)
- (* *)
- (* <Function> *)
- (* FT_Done_Glyph *)
- (* *)
- (* <Description> *)
- (* Destroys a given glyph. *)
- (* *)
- (* <Input> *)
- (* glyph :: A handle to the target glyph object. *)
- (* *)
- procedure FT_Done_Glyph( glyph: FT_Glyph );
- cdecl; external ft_lib name 'FT_Done_Glyph';
-
-{$ENDIF TYPE_DECL}
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