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lazarus/components/lazutils/lazfreetype.pas

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(*******************************************************************
*
* FreeType.Pas
*
* High-level interface specification.
*
* Copyright 1996 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.
*
* Notes :
*
* This is the only file that should be included by client
* application sources for the final release. All other types
* and functions defined in the "tt*.h" files are library
* internals, and should not be included ( except of course
* during development, as now )
*
******************************************************************)
{
From: http://www.freetype.org/license.html
FreeType comes with two licenses from which you can choose the one which fits your needs best.
The FreeType License is the most commonly used one. Full text here: http://www.freetype.org/FTL.TXT
It is a BSD-style license with a credit clause (and thus compatible with GPLv3 but not GPLv2).
The GNU General Public License (GPL), version 2.
For all projects which use GPLv2 also or which need a license compatible to the GPLv2.
}
unit LazFreeType;
interface
{$R-}
uses TTTypes, Classes;
(***********************************************************************)
(* *)
(* Base Library Functions *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* Initialise the engine *)
(* *)
function TT_Init_FreeType : TT_Error;
(*****************************************************************)
(* Finalise the engine - discards all objects *)
(* *)
procedure TT_Done_FreeType;
(*****************************************************************)
(* Set the gray-level palette used for font-smoothing *)
(* *)
(* it is an array of 5 bytes following this convention : *)
(* *)
(* palette[0] := background (white) *)
(* palette[1] := light *)
(* palette[2] := medium *)
(* palette[3] := dark *)
(* palette[4] := foreground (black) *)
(* *)
function TT_Set_Raster_Palette( palette : TT_Gray_Palette ) : TT_Error;
(***********************************************************************)
(* *)
(* Face Management functions *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* Open a new font file and returns a handle for it in '_face' *)
(* *)
(* The file can be a TrueType collection, in which case the *)
(* first embedded font will be loaded. *)
(* *)
function TT_Open_Face( fontname : string;
var _face : TT_Face ) : TT_Error;
function TT_Open_Face( AStream : TStream; AStreamOwner: boolean;
var _face : TT_Face ) : TT_Error;
(*****************************************************************)
(* Open a font file embedded in a collection. *)
(* *)
function TT_Open_Collection( fontname : string;
faceIndex : integer;
var _face : TT_Face ) : TT_Error;
(*****************************************************************)
(* Return face properties in 'prop' *)
(* *)
function TT_Get_Face_Properties( _face : TT_Face;
out prop : TT_Face_Properties ) : TT_Error;
(*****************************************************************)
(* Set face's generic pointer *)
(* *)
function TT_Set_Face_Pointer( _face : TT_Face;
data : Pointer ) : TT_Error;
(*****************************************************************)
(* Get face's generic pointer *)
(* *)
function TT_Get_Face_Pointer( _face : TT_Face ) : Pointer;
(*****************************************************************)
(* close a given face object. This releases all child objects *)
(* like instances and glyphs *)
(* *)
function TT_Close_Face( _face : TT_Face ) : TT_Error;
(***********************************************************************)
(* *)
(* Instance management functions *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* open a new face instance and return a handle in '_ins' *)
(* *)
function TT_New_Instance( _face : TT_Face;
var _ins : TT_Instance ) : TT_Error;
(*****************************************************************)
(* set an instance's device resolutions, expressed in dpi *)
(* *)
function TT_Set_Instance_Resolutions( _ins : TT_Instance;
x_resolution : Integer;
y_resolution : Integer ) : TT_Error;
(*****************************************************************)
(* set an instance's point size (assumes width==height) *)
(* *)
function TT_Set_Instance_PointSize( _ins : TT_Instance;
pointsize : Integer ) : TT_Error;
(*****************************************************************)
(* set an instance's point size (assumes width==height) *)
(* *)
function TT_Set_Instance_CharSize( _ins : TT_Instance;
charsize : Integer ) : TT_Error;
(*****************************************************************)
(* set an instance's point size (assumes width==height) *)
(* *)
function TT_Set_Instance_CharSizes( _ins : TT_Instance;
charsizex : Integer;
charsizey : Integer ) : TT_Error;
(*****************************************************************)
(* set an instance's height and width, expressed in pixels *)
(* *)
function TT_Set_Instance_PixelSizes( _ins : TT_Instance;
pixelX : Integer;
pixelY : Integer;
pointsize : Integer ) : TT_Error;
(*****************************************************************)
(* set an instance's height and width, expressed in pixels *)
(* *)
(*****************************************************************)
(* the core truetype engine doesn't provide _direct_ support *)
(* for rotation or stretching. This means that the transforms *)
(* must be applied on the glyph outline by a higher-level *)
(* library or the client application. However, we use two flags *)
(* to notice the TrueType hinter that the glyphs will be *)
(* transformed later. *)
(* *)
(* rotated : set if the glyphs are to be rotated *)
(* distorted : set if the glyphs are to be distorted *)
(* *)
(* an application is any transform that doesn't keep distances *)
(* constants. skewing and stretching are examples of distorsion *)
(* *)
function TT_Set_Instance_Transforms( _ins : TT_Instance;
rotated : Boolean;
distorted : Boolean ) : TT_Error;
(*****************************************************************)
(* Return instance metrics in 'm' *)
(* *)
function TT_Get_Instance_Metrics( _ins : TT_Instance;
out m : TT_Instance_Metrics ) : TT_Error;
(*****************************************************************)
(* Set instance generic pointer *)
(* *)
function TT_Set_Instance_Pointer( _ins : TT_Instance;
data : Pointer ) : TT_Error;
(*****************************************************************)
(* Get instance generic pointer *)
(* *)
function TT_Get_Instance_Pointer( _ins : TT_Instance ) : Pointer;
(*****************************************************************)
(* Close an instance *)
(* *)
function TT_Done_Instance( _ins : TT_Instance ) : TT_Error;
(***********************************************************************)
(* *)
(* Glyph management functions *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* Create a new glyph container, return a handle in '_glyph' *)
(* *)
function TT_New_Glyph( _face : TT_Face;
var _glyph : TT_Glyph ) : TT_Error;
(*****************************************************************)
(* Releases a glyph container *)
(* *)
function TT_Done_Glyph( _glyph : TT_Glyph ) : TT_Error;
(*****************************************************************)
(* Load a glyph inside a container *)
(* *)
function TT_Load_Glyph( _instance : TT_Instance;
_glyph : TT_Glyph;
glyph_index : Word;
load_flags : Integer ) : TT_Error;
const
TT_Load_Scale_Glyph = 1; (* ask the loader to scale the glyph *)
(* to the current pointsize/transform *)
TT_Load_Hint_Glyph = 2; (* when scaling is on, ask the loader *)
(* to hint the glyph too.. *)
TT_Load_Debug = 16;
TT_Load_Default = TT_Load_Scale_Glyph or
TT_Load_Hint_Glyph;
(*****************************************************************)
(* Get a glyph's outline *)
(* *)
function TT_Get_Glyph_Outline( _glyph : TT_Glyph;
var outline : TT_Outline ) : TT_Error;
(*****************************************************************)
(* Get a glyph's metrics *)
(* *)
function TT_Get_Glyph_Metrics( _glyph : TT_Glyph;
var gmetrics : TT_Glyph_Metrics ) : TT_Error;
(*****************************************************************)
(* Get a glyph's big metrics *)
(* *)
function TT_Get_Glyph_Big_Metrics( _glyph : TT_Glyph;
var gmetrics : TT_Big_Glyph_Metrics
) : TT_Error;
(*****************************************************************)
(* Render a glyph's bitmap *)
(* *)
function TT_Get_Glyph_Bitmap( _glyph : TT_Glyph;
var map : TT_Raster_Map;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
(*****************************************************************)
(* Render a glyph's pixmap (i.e. smoothed glyph ) *)
(* *)
function TT_Get_Glyph_Pixmap( _glyph : TT_Glyph;
var map : TT_Raster_Map;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
function TT_Get_Glyph_Pixmap_HQ( _glyph : TT_Glyph;
var map : TT_Raster_Map;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
function TT_Render_Directly_Glyph_Gray( var _glyph : TT_Glyph;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6;
x,y,tx,ty: integer;
OnRender: TDirectRenderingFunction; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
function TT_Render_Directly_Glyph_HQ( var _glyph : TT_Glyph;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6;
x,y,tx,ty: integer;
OnRender: TDirectRenderingFunction; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
(***********************************************************************)
(* *)
(* Outline functions *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* Apply translation to an outline *)
(* *)
function TT_Translate_Outline( var out : TT_Outline;
x, y : TT_F26Dot6 ) : TT_Error;
(*****************************************************************)
(* Apply a 2x2 transform to an outline *)
(* *)
function TT_Transform_Outline( var out : TT_Outline;
var mat : TT_Matrix ) : TT_Error;
(*****************************************************************)
(* Apply a 2x2 transform to a vector *)
(* *)
function TT_Transform_Vector( var x, y : TT_F26Dot6;
var mat : TT_Matrix ) : TT_Error;
(*****************************************************************)
(* Render an outline into a bitmap *)
(* *)
function TT_Get_Outline_Bitmap( var out : TT_Outline;
var map : TT_raster_Map; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
(*****************************************************************)
(* Render an outline into a pixmap *)
(* *)
function TT_Get_Outline_Pixmap( var out : TT_Outline;
var map : TT_raster_Map; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
function TT_Get_Outline_Pixmap_HQ( var out : TT_Outline;
var map : TT_raster_Map; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
function TT_Render_Directly_Outline_Gray( var out : TT_Outline;
x, y, tx, ty: integer;
OnRender: TDirectRenderingFunction; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
function TT_Render_Directly_Outline_HQ( var out : TT_Outline;
x, y, tx, ty: integer;
OnRender: TDirectRenderingFunction; rasterizer: TFreeTypeCustomRasterizer = nil ) : TT_Error;
(*****************************************************************)
(* Get an outline's bounding box *)
(* *)
function TT_Get_Outline_BBox( var out : TT_Outline;
var bbox : TT_Bbox ) : TT_Error;
(*****************************************************************)
(* Create a new glyph outline *)
(* *)
function TT_New_Outline( n_points : integer;
n_contours : integer;
var out : TT_Outline ) : TT_Error;
(*****************************************************************)
(* Copy a glyph outline into another one *)
(* *)
function TT_Copy_Outline( var source : TT_Outline;
var target : TT_Outline ) : TT_Error;
(*****************************************************************)
(* Clone a given outline. This will create the outline, then *)
(* copy the source in it *)
(* *)
function TT_Clone_Outline( var source : TT_Outline;
var target : TT_Outline ) : TT_Error;
(*****************************************************************)
(* Discards a glyph outline *)
(* *)
function TT_Done_Outline( var out : TT_Outline ) : TT_Error;
(***********************************************************************)
(* *)
(* Character Mapping support *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* Get a face's number of character maps *)
(* *)
function TT_Get_CharMap_Count( face : TT_Face ) : integer;
(*****************************************************************)
(* Get a given char. map's ID in a face *)
(* *)
function TT_Get_CharMap_ID( face : TT_Face;
charmapIndex : integer;
var platform : integer;
var encoding : integer ) : TT_Error;
(*****************************************************************)
(* Get a handle to a given char. map *)
(* *)
function TT_Get_CharMap( face : TT_Face;
charmapIndex : integer;
var charMap : TT_CharMap ) : TT_Error;
(*****************************************************************)
(* Translate from char. code to glyph index *)
(* *)
function TT_Char_Index( charmap : TT_CharMap;
charCode : Longint ) : Word;
(***********************************************************************)
(* *)
(* Names Table support *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* Return number of name table entries *)
(* *)
function TT_Get_Name_Count( face : TT_Face ) : integer;
(*****************************************************************)
(* Return the ID of a given name table entry *)
(* *)
function TT_Get_Name_ID( face : TT_Face;
nameIndex : integer;
out platform : integer;
out encoding : integer;
out language : integer;
out nameid : integer ) : TT_Error;
(*****************************************************************)
(* Return a given name table string *)
(* *)
function TT_Get_Name_String( face : TT_Face;
nameIndex : integer;
out str : Pointer;
out len : integer ) : TT_Error;
function TT_Get_Name_String( face : TT_Face;
nameIndex : integer ) : string;
(***********************************************************************)
(* *)
(* Font Storage Access *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* Access font data and copies it into user block *)
(* *)
function TT_Get_Font_Data( face : TT_Face;
tableTag : Longint;
offset : Longint;
var buffer;
var length : longint ) : TT_Error;
implementation
uses
TTError,
TTCalc,
TTMemory,
TTTables,
TTCache,
TTFile,
TTCMap,
TTObjs,
TTLoad,
TTGLoad,
TTRaster;
(*****************************************************************)
(* *)
(* *)
function TT_Init_FreeType : TT_Error;
begin
if TTMemory_Init or
TTCache_Init or
TTFile_Init or
TTObjs_Init or
TTRaster_Init then
begin
TT_Init_FreeType := error;
exit;
end;
TT_Init_FreeType := TT_Err_Ok;
end;
(*****************************************************************)
(* *)
(* *)
procedure TT_Done_FreeType;
begin
TTRaster_Done;
TTObjs_Done;
TTFile_Done;
TTCache_Done;
TTMemory_Done;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Set_Raster_Palette( palette : TT_Gray_Palette ) : TT_Error;
begin
TTGetDefaultRasterizer.Set_Raster_Palette( palette );
TT_Set_Raster_Palette := TT_Err_Ok;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Open_Face( fontname : string;
var _face : TT_Face ) : TT_Error;
var
input : TFont_Input;
begin
input.fontIndex := 0;
if TT_Open_Stream( fontname, input.stream ) then
begin
TT_Open_Face := error;
exit;
end;
Cache_New( face_cache, Pointer(_face), @input );
TT_Open_Face := error;
end;
function TT_Open_Face(AStream: TStream; AStreamOwner: boolean;
var _face: TT_Face): TT_Error;
var
input : TFont_Input;
begin
input.fontIndex := 0;
if TT_Open_Stream( AStream, AStreamOwner, input.stream ) then
begin
TT_Open_Face := error;
exit;
end;
Cache_New( face_cache, Pointer(_face), @input );
TT_Open_Face := error;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Open_Collection( fontname : string;
faceIndex : integer;
var _face : TT_Face ) : TT_Error;
var
input : TFont_Input;
begin
input.fontIndex := faceIndex;
if TT_Open_Stream( fontname, input.stream ) then
begin
TT_Open_Collection := error;
exit;
end;
Cache_New( face_cache, Pointer(_face), @input );
TT_Open_Collection := error;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Face_Properties( _face : TT_Face;
out prop : TT_Face_Properties ) : TT_Error;
var
face : PFace;
begin
face := _face.z;
if face <> nil then
begin
with prop do
begin
num_Glyphs := face^.numGlyphs;
max_Points := face^.maxPoints;
max_Contours := face^.maxContours;
max_Faces := face^.ttcHeader.dirCount;
header := @face^.fontHeader;
horizontal := @face^.horizontalHeader;
if face^.verticalInfo then
vertical := @face^.verticalHeader
else
vertical := nil;
os2 := @face^.os2;
postscript := @face^.postscript;
end;
TT_Get_Face_Properties := TT_Err_Ok;
end
else
TT_Get_Face_Properties := TT_Err_Invalid_Face_Handle;
end;
(*****************************************************************)
(* Set face's generic pointer *)
(* *)
function TT_Set_Face_Pointer( _face : TT_Face;
data : Pointer ) : TT_Error;
var
face :PFace;
begin
face := PFace(_face.z);
if face <> nil then
begin
face^.generic := data;
TT_Set_Face_Pointer := TT_Err_Ok;
end
else
TT_Set_Face_Pointer := TT_Err_Invalid_Face_Handle;
end;
(*****************************************************************)
(* Get face's generic pointer *)
(* *)
function TT_Get_Face_Pointer( _face : TT_Face ) : Pointer;
var
face : PFace;
begin
face := PFace(_face.z);
if face <> nil then
TT_Get_Face_Pointer := face^.generic
else
TT_get_Face_Pointer := nil;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Close_Face( _face : TT_Face ) : TT_Error;
var
face : PFace;
begin
face := _face.z;
if face <> nil then
begin
error := TT_Err_Ok;
(* Note : the stream is closed by the face destructor !! *)
Cache_Done( face_cache, _face.z );
TT_Close_Face := error;
end
else
TT_Close_Face := TT_Err_Invalid_Face_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_New_Instance( _face : TT_Face;
var _ins : TT_Instance ) : TT_Error;
var
face : PFace;
begin
face := _face.z;
if face <> nil then
begin
error := TT_Err_Ok;
if not Cache_New( face^.instances, _ins.z, face ) then
Instance_Init( _ins.z );
TT_New_Instance := error;
end
else
TT_New_Instance := TT_Err_Invalid_Face_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Set_Instance_Resolutions( _ins : TT_Instance;
x_resolution : Integer;
y_resolution : Integer ) : TT_Error;
var
ins : PInstance;
begin
ins := _ins.z;
if ins <> nil then
begin
ins^.metrics.x_resolution := x_resolution;
ins^.metrics.y_resolution := y_resolution;
ins^.valid := False;
TT_Set_Instance_Resolutions := TT_Err_Ok;
end
else
TT_Set_Instance_Resolutions := TT_Err_Invalid_Instance_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Set_Instance_CharSize( _ins : TT_Instance;
charsize : Integer ) : TT_Error;
begin
TT_Set_Instance_CharSize :=
TT_Set_Instance_CharSizes( _ins, charsize, charsize );
end;
(*****************************************************************)
(* *)
(* *)
function TT_Set_Instance_CharSizes( _ins : TT_Instance;
charsizex : Integer;
charsizey : Integer ) : TT_Error;
var
ins : PInstance;
begin
if (charsizex < 1*64) or (charsizey < 1*64) then
begin
TT_Set_Instance_CharSizes := TT_Err_Bad_Argument;
exit;
end;
ins := _ins.z;
if ins <> nil then
begin
with ins^.metrics do
begin
x_scale1 := ( Long(charsizex) * x_resolution ) div 72;
x_scale2 := ins^.owner^.fontHeader.units_per_EM;
y_scale1 := ( Long(charsizey) * y_resolution ) div 72;
y_scale2 := x_scale2;
if ins^.owner^.fontHeader.flags and 8 <> 0 then
begin
x_scale1 := (x_scale1 + 32) and -64;
y_scale1 := (y_scale1 + 32) and -64;
end;
x_ppem := x_scale1 div 64;
y_ppem := y_scale1 div 64;
end;
if charsizex > charsizey then
ins^.metrics.pointsize := charsizex
else
ins^.metrics.pointsize := charsizey;
ins^.valid := False;
TT_Set_Instance_CharSizes := TT_Err_Ok;
end
else
TT_Set_Instance_CharSizes := TT_Err_Invalid_Instance_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Set_Instance_PointSize( _ins : TT_Instance;
pointsize : integer ) : TT_Error;
begin
TT_Set_Instance_PointSize :=
TT_Set_Instance_CharSize( _ins, pointsize*64 );
end;
(*****************************************************************)
(* *)
(* *)
function TT_Set_Instance_PixelSizes( _ins : TT_Instance;
pixelX : Integer;
pixelY : Integer;
pointsize : Integer ) : TT_Error;
var
ins : PInstance;
begin
ins := _ins.z;
if ins <> nil then
begin
ins^.metrics.x_ppem := pixelX;
ins^.metrics.y_ppem := pixelY;
ins^.metrics.pointSize := pointsize;
ins^.metrics.x_scale1 := ins^.metrics.x_ppem * 64;
ins^.metrics.x_scale2 := ins^.owner^.fontHeader.units_per_EM;
ins^.metrics.y_scale1 := ins^.metrics.y_ppem * 64;
ins^.metrics.y_scale2 := ins^.metrics.x_scale2;
ins^.valid := false;
TT_Set_Instance_PixelSizes := TT_Err_Ok;
end
else
TT_Set_Instance_PixelSizes := TT_Err_Invalid_Instance_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Set_Instance_Transforms( _ins : TT_Instance;
rotated : Boolean;
distorted : Boolean ) : TT_Error;
var
ins : PInstance;
begin
ins := _ins.z;
if ins <> nil then
begin
ins^.metrics.rotated := rotated;
ins^.metrics.stretched := distorted;
TT_Set_Instance_Transforms := TT_Err_Ok;
end
else
TT_Set_Instance_Transforms := TT_Err_Invalid_Instance_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Instance_Metrics( _ins : TT_Instance;
out m : TT_Instance_Metrics ) : TT_Error;
var
ins : PInstance;
begin
{$hints off}
fillchar(m, sizeof(m),0);
{$hints on}
ins := _ins.z;
if ins <> nil then
begin
if not ins^.valid then
if Instance_Reset( ins, False ) then
begin
TT_Get_Instance_Metrics := error;
exit;
end;
with m do
begin
pointSize := ins^.metrics.pointSize;
x_scale := MulDiv_Round( $10000,
ins^.metrics.x_scale1,
ins^.metrics.x_scale2 );
y_scale := MulDiv_Round( $10000,
ins^.metrics.y_scale1,
ins^.metrics.y_scale2 );
x_resolution := ins^.metrics.x_resolution;
y_resolution := ins^.metrics.y_resolution;
x_ppem := ins^.metrics.x_ppem;
y_ppem := ins^.metrics.y_ppem;
TT_Get_Instance_Metrics := TT_Err_Ok;
end;
end
else
TT_Get_Instance_Metrics := TT_Err_Invalid_Instance_Handle;
end;
(*****************************************************************)
(* Set instance generic pointer *)
(* *)
function TT_Set_Instance_Pointer( _ins : TT_Instance;
data : Pointer ) : TT_Error;
var
ins : PInstance;
begin
ins := PInstance(_ins.z);
if ins <> nil then
begin
ins^.generic := data;
TT_Set_Instance_Pointer := TT_Err_Ok;
end
else
TT_Set_Instance_Pointer := TT_Err_Invalid_Instance_Handle;
end;
(*****************************************************************)
(* Get instance generic pointer *)
(* *)
function TT_Get_Instance_Pointer( _ins : TT_Instance ) : Pointer;
var
ins : PInstance;
begin
ins := PInstance(_ins.z);
if ins <> nil then
TT_Get_Instance_Pointer := ins^.generic
else
TT_Get_Instance_Pointer := nil;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Done_Instance( _ins : TT_Instance ) : TT_Error;
var
ins : PInstance;
begin
ins := PInstance(_ins.z);
if ins <> nil then
begin
error := TT_Err_Ok;
Cache_Done( ins^.owner^.instances, ins );
TT_Done_Instance := error;
end
else
TT_Done_Instance := TT_Err_Invalid_Instance_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_New_Glyph( _face : TT_Face;
var _glyph : TT_Glyph ) : TT_Error;
var
face : PFace;
begin
face := PFace(_face.z);
if face <> nil then
begin
error := TT_Err_Ok;
Cache_New( face^.glyphs, _glyph.z, _face.z );
TT_New_Glyph := error;
end
else
TT_New_Glyph := TT_Err_Invalid_Face_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Done_Glyph( _glyph : TT_Glyph ) : TT_Error;
var
glyph : PGlyph;
begin
glyph := PGlyph(_glyph.z);
if glyph <> nil then
begin
error := TT_Err_Ok;
Cache_Done( glyph^.face^.glyphs, glyph );
TT_Done_Glyph := error;
end
else
TT_Done_Glyph := TT_Err_Invalid_Glyph_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Load_Glyph( _instance : TT_Instance;
_glyph : TT_Glyph;
glyph_index : Word;
load_flags : Integer ) : TT_Error;
var
ins : PInstance;
glyph : PGlyph;
begin
ins := PInstance(_instance.z);
if ins = nil then
begin
TT_Load_Glyph := TT_Err_Invalid_Instance_Handle;
exit;
end;
glyph := PGlyph(_glyph.z);
if glyph = nil then
begin
TT_Load_Glyph := TT_Err_Invalid_Glyph_Handle;
exit;
end;
if ins^.owner <> glyph^.face then
begin
TT_Load_Glyph := TT_Err_Invalid_Face_Handle;
exit;
end;
if not ins^.valid then
if Instance_Reset( ins, False ) then
begin
TT_Load_Glyph := error;
exit;
end;
error := TT_Err_Ok;
Load_TrueType_Glyph( ins, glyph, glyph_index, load_flags );
TT_Load_Glyph := error;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Glyph_Outline( _glyph : TT_Glyph;
var outline : TT_Outline ) : TT_Error;
var
glyph : PGlyph;
begin
glyph := PGlyph(_glyph.z);
if glyph <> nil then
begin
outline := glyph^.outline;
outline.owner := false;
TT_Get_Glyph_Outline := TT_Err_Ok;
end
else
TT_Get_Glyph_Outline := TT_Err_Invalid_Glyph_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Glyph_Metrics( _glyph : TT_Glyph;
var gmetrics : TT_Glyph_Metrics ) : TT_Error;
var
glyph : PGlyph;
begin
glyph := PGlyph(_glyph.z);
if glyph <> nil then
begin
gmetrics.bbox := glyph^.metrics.bbox;
gmetrics.bearingX := glyph^.metrics.horiBearingX;
gmetrics.bearingY := glyph^.metrics.horiBearingY;
gmetrics.advance := glyph^.metrics.horiAdvance;
TT_Get_Glyph_Metrics := TT_Err_Ok;
end
else
TT_Get_Glyph_Metrics := TT_Err_Invalid_Glyph_Handle;
end;
(*****************************************************************)
(* Get a glyph's big metrics *)
(* *)
function TT_Get_Glyph_Big_Metrics( _glyph : TT_Glyph;
var gmetrics : TT_Big_Glyph_Metrics
) : TT_Error;
var
glyph : PGlyph;
begin
glyph := PGlyph(_glyph.z);
if glyph <> nil then
begin
gmetrics := glyph^.metrics;
TT_Get_Glyph_Big_Metrics := TT_Err_Ok;
end
else
TT_Get_Glyph_Big_Metrics := TT_Err_Invalid_Glyph_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Glyph_Bitmap( _glyph : TT_Glyph;
var map : TT_raster_Map;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6;
rasterizer: TFreeTypeCustomRasterizer) : TT_Error;
var
glyph : PGlyph;
outline : TT_Outline;
begin
glyph := _glyph.z;
if glyph <> nil then
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
outline := glyph^.outline;
(* XXX: for now, we only use dropout mode #2 *)
outline.dropout_mode := 2;
TT_Translate_Outline( outline, x_offset, y_offset );
TT_Get_Glyph_Bitmap := TT_Get_Outline_Bitmap( outline, map, rasterizer );
TT_Translate_Outline( outline, -x_offset, -y_offset );
end
else
TT_Get_Glyph_Bitmap := TT_Err_Invalid_Glyph_Handle;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Glyph_Pixmap( _glyph : TT_Glyph;
var map : TT_raster_Map;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6;
rasterizer: TFreeTypeCustomRasterizer ) : TT_Error;
var
glyph : PGlyph;
outline : TT_Outline;
begin
glyph := _glyph.z;
if glyph <> nil then
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
outline := glyph^.outline;
(* XXX: for now, we only use dropout mode #2 *)
outline.dropout_mode := 2;
TT_translate_Outline( outline, x_offset, y_offset );
TT_Get_Glyph_Pixmap := TT_Get_Outline_Pixmap( outline, map );
TT_translate_Outline( outline, -x_offset, -y_offset );
end
else
TT_Get_Glyph_Pixmap := TT_Err_Invalid_Glyph_Handle;
end;
function TT_Get_Glyph_Pixmap_HQ( _glyph : TT_Glyph;
var map : TT_raster_Map;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6;
rasterizer: TFreeTypeCustomRasterizer ) : TT_Error;
var
glyph : PGlyph;
outline : TT_Outline;
begin
glyph := _glyph.z;
if glyph <> nil then
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
outline := glyph^.outline;
(* XXX: for now, we only use dropout mode #2 *)
outline.dropout_mode := 2;
TT_translate_Outline( outline, x_offset, y_offset );
TT_Get_Glyph_Pixmap_HQ := TT_Get_Outline_Pixmap_HQ( outline, map );
TT_translate_Outline( outline, -x_offset, -y_offset );
end
else
TT_Get_Glyph_Pixmap_HQ := TT_Err_Invalid_Glyph_Handle;
end;
function TT_Render_Directly_Glyph_Gray(var _glyph: TT_Glyph; x_offset: TT_F26Dot6;
y_offset: TT_F26Dot6; x, y, tx, ty: integer;
OnRender: TDirectRenderingFunction;
rasterizer: TFreeTypeCustomRasterizer): TT_Error;
var
glyph : PGlyph;
outline : TT_Outline;
begin
glyph := _glyph.z;
if glyph <> nil then
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
outline := glyph^.outline;
(* XXX: for now, we only use dropout mode #2 *)
outline.dropout_mode := 2;
TT_translate_Outline( outline, x_offset, y_offset );
TT_Render_Directly_Glyph_Gray := TT_Render_Directly_Outline_Gray( outline, x,y,tx,ty,OnRender );
TT_translate_Outline( outline, -x_offset, -y_offset );
end
else
TT_Render_Directly_Glyph_Gray := TT_Err_Invalid_Glyph_Handle;
end;
function TT_Render_Directly_Glyph_HQ(var _glyph: TT_Glyph;
x_offset : TT_F26Dot6;
y_offset : TT_F26Dot6;
x, y, tx, ty: integer;
OnRender: TDirectRenderingFunction;
rasterizer: TFreeTypeCustomRasterizer): TT_Error;
var
glyph : PGlyph;
outline : TT_Outline;
begin
glyph := _glyph.z;
if glyph <> nil then
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
outline := glyph^.outline;
(* XXX: for now, we only use dropout mode #2 *)
outline.dropout_mode := 2;
TT_translate_Outline( outline, x_offset, y_offset );
TT_Render_Directly_Glyph_HQ := TT_Render_Directly_Outline_HQ( outline, x,y,tx,ty,OnRender );
TT_translate_Outline( outline, -x_offset, -y_offset );
end
else
TT_Render_Directly_Glyph_HQ := TT_Err_Invalid_Glyph_Handle;
end;
(*****************************************************************)
(* Create a new glyph outline *)
(* *)
function TT_New_Outline( n_points : integer;
n_contours : integer;
var out : TT_Outline ) : TT_Error;
label
Fail;
begin
out.n_points := n_points;
out.n_contours := n_contours;
out.points := nil;
out.flags := nil;
out.conEnds := nil;
out.owner := true;
if Alloc( Pointer(out.points), 2*n_points*sizeof(TT_Pos) ) or
Alloc( Pointer(out.flags), n_points*sizeof(Byte) ) or
Alloc( Pointer(out.conEnds), n_contours*sizeof(Short) ) then
goto Fail;
TT_New_Outline := TT_Err_Ok;
exit;
Fail:
TT_Done_Outline( out );
TT_New_Outline := error;
end;
(*****************************************************************)
(* Copy a glyph outline into another one *)
(* *)
function TT_Copy_Outline( var source : TT_Outline;
var target : TT_Outline ) : TT_Error;
begin
if (source.n_points = target.n_points) and
(source.n_contours = target.n_contours) then
begin
move( source.points^, target.points^, 2*source.n_points*4 );
move( source.flags^, target.flags^, source.n_points );
move( source.conEnds^,target.conEnds^, source.n_contours*2 );
end
else
TT_Copy_Outline := TT_Err_Invalid_Argument;
end;
(*****************************************************************)
(* Clone a given outline. This will create the outline, then *)
(* copy the source in it *)
(* *)
function TT_Clone_Outline( var source : TT_Outline;
var target : TT_Outline ) : TT_Error;
begin
error := TT_New_Outline( source.n_points, source.n_contours, target );
if error = TT_Err_Ok then
TT_Copy_Outline( source, target );
TT_Clone_Outline := error;
end;
(*****************************************************************)
(* Discards a glyph outline *)
(* *)
function TT_Done_Outline( var out : TT_Outline ) : TT_Error;
begin
if out.owner then
begin
Free( Pointer(out.conEnds) );
Free( Pointer(out.flags) );
Free( Pointer(out.points) );
out.n_points := 0;
out.n_contours := 0;
TT_Done_Outline := TT_Err_Ok;
end
else
TT_Done_Outline := TT_Err_Invalid_Argument;
end;
(*****************************************************************)
(* Render an outline into a bitmap *)
(* *)
function TT_Get_Outline_Bitmap( var out : TT_Outline;
var map : TT_raster_Map;
rasterizer: TFreeTypeCustomRasterizer ) : TT_Error;
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
if rasterizer.Render_Glyph( out, map ) then
TT_Get_Outline_Bitmap := error
else
TT_Get_Outline_Bitmap := TT_Err_Ok;
end;
(*****************************************************************)
(* Render an outline into a pixmap *)
(* *)
function TT_Get_Outline_Pixmap( var out : TT_Outline;
var map : TT_raster_Map;
rasterizer: TFreeTypeCustomRasterizer ) : TT_Error;
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
if rasterizer.Render_Gray_Glyph( out, map, nil ) then
TT_Get_Outline_Pixmap := error
else
TT_Get_Outline_Pixmap := TT_Err_Ok;
end;
function TT_Get_Outline_Pixmap_HQ( var out : TT_Outline;
var map : TT_raster_Map;
rasterizer: TFreeTypeCustomRasterizer ) : TT_Error;
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
if rasterizer.Render_Gray_Glyph_HQ( out, map ) then
TT_Get_Outline_Pixmap_HQ := error
else
TT_Get_Outline_Pixmap_HQ := TT_Err_Ok;
end;
function TT_Render_Directly_Outline_Gray(var out: TT_Outline; x, y, tx,
ty: integer; OnRender: TDirectRenderingFunction;
rasterizer: TFreeTypeCustomRasterizer): TT_Error;
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
if rasterizer.Render_Directly_Gray_Glyph( out, x,y,tx,ty, OnRender, nil ) then
TT_Render_Directly_Outline_Gray := error
else
TT_Render_Directly_Outline_Gray := TT_Err_Ok;
end;
function TT_Render_Directly_Outline_HQ(var out: TT_Outline; x, y, tx,
ty: integer; OnRender: TDirectRenderingFunction;
rasterizer: TFreeTypeCustomRasterizer): TT_Error;
begin
if rasterizer = nil then rasterizer := TTGetDefaultRasterizer;
if rasterizer.Render_Directly_Gray_Glyph_HQ( out, x,y,tx,ty, OnRender ) then
TT_Render_Directly_Outline_HQ := error
else
TT_Render_Directly_Outline_HQ := TT_Err_Ok;
end;
(*****************************************************************)
(* Compute an outline's bounding box *)
(* *)
function TT_Get_Outline_BBox( var out : TT_Outline;
var bbox : TT_Bbox ) : TT_Error;
var
x, y : TT_Pos;
n : Int;
begin
with bbox do
begin
xMin := $7FFFFFFF;
xMax := -$80000000;
yMin := $7FFFFFFF;
yMax := -$80000000;
for n := 0 to out.n_points-1 do
begin
x := out.points^[n].x;
if x < xMin then xMin := x;
if x > xMax then xMax := x;
y := out.points^[n].y;
if y < yMin then yMin := y;
if y > yMax then yMax := y;
end;
end;
TT_Get_Outline_BBox := TT_Err_Ok;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Translate_Outline( var out : TT_Outline;
x, y : TT_F26Dot6 ) : TT_Error;
var
n : integer;
begin
if x <> 0 then
for n := 0 to out.n_points-1 do
inc( out.points^[n].x, x );
if y <> 0 then
for n := 0 to out.n_points-1 do
inc( out.points^[n].y, y );
TT_Translate_Outline := TT_Err_Ok;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Transform_Outline( var out : TT_Outline;
var mat : TT_Matrix ) : TT_Error;
var
n : integer;
x, y, nx, ny : TT_F26Dot6;
begin
for n := 0 to out.n_points-1 do
begin
x := out.points^[n].x;
y := out.points^[n].y;
nx := MulDiv_Round( mat.xx, x, $10000 ) +
MulDiv_Round( mat.xy, y, $10000 );
ny := MulDiv_ROund( mat.yx, x, $10000 ) +
MulDiv_Round( mat.yy, y, $10000 );
out.points^[n].x := nx;
out.points^[n].y := ny;
end;
TT_Transform_Outline := TT_Err_Ok;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Transform_Vector( var x, y : TT_F26Dot6;
var mat : TT_Matrix ) : TT_Error;
var
nx, ny : TT_F26Dot6;
begin
nx := MulDiv_Round( mat.xx, x, $10000 ) +
MulDiv_Round( mat.xy, y, $10000 );
ny := MulDiv_Round( mat.yx, x, $10000 ) +
MulDiv_Round( mat.yy, y, $10000 );
x := nx;
y := ny;
TT_Transform_Vector := TT_Err_Ok;
end;
(***********************************************************************)
(* *)
(* Character Mapping support *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* *)
(* *)
function TT_Get_CharMap_Count( face : TT_Face ) : integer;
var
faze : PFace;
begin
faze := PFace(face.z);
if faze = nil then
TT_Get_CharMap_Count := -1
else
TT_Get_CharMap_Count := faze^.numCMaps;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_CharMap_ID( face : TT_Face;
charmapIndex : integer;
var platform : integer;
var encoding : integer ) : TT_Error;
var
faze : PFace;
cmap : PCMapTable;
begin
faze := PFace(face.z);
if faze = nil then
begin
TT_Get_CharMap_ID := TT_Err_Invalid_Face_Handle;
exit;
end;
if (charmapIndex < 0) or (charmapIndex >= faze^.numCMaps) then
begin
TT_Get_CharMap_ID := TT_Err_Invalid_Argument;
exit;
end;
cmap := @faze^.cMaps^[charmapIndex];
platform := cmap^.platformID;
encoding := cmap^.platformEncodingID;
TT_Get_CharMap_ID := TT_Err_Ok;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_CharMap( face : TT_Face;
charmapIndex : integer;
var charMap : TT_CharMap ) : TT_Error;
var
faze : PFace;
begin
faze := PFace(face.z);
if faze = nil then
begin
TT_Get_CharMap := TT_Err_Invalid_Face_Handle;
exit;
end;
if (charmapIndex < 0) or (charmapIndex >= faze^.numCMaps) then
begin
TT_Get_CharMap := TT_Err_Invalid_Argument;
exit;
end;
charmap.z := @faze^.cMaps^[charmapIndex];
TT_Get_CharMap := TT_Err_Ok;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Char_Index( charmap : TT_CharMap;
charCode : Longint ) : Word;
begin
TT_Char_Index := CharMap_Index( PCMapTable(charmap.z)^, charCode );
end;
(***********************************************************************)
(* *)
(* Names Table support *)
(* *)
(***********************************************************************)
(*****************************************************************)
(* *)
(* *)
function TT_Get_Name_Count( face : TT_Face ) : integer;
var
faze : PFace;
begin
TT_Get_Name_Count := 0;
faze := PFace( face.z );
if faze = nil then exit;
TT_Get_Name_Count := faze^.nameTable.numNameRecords;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Name_ID( face : TT_Face;
nameIndex : integer;
out platform : integer;
out encoding : integer;
out language : integer;
out nameid : integer ) : TT_Error;
var
faze : PFace;
table : PName_Table;
rec : PName_Record;
label
Fail;
begin
faze := PFace( face.z );
if faze = nil then
begin
TT_Get_Name_Id := TT_Err_Invalid_Face_Handle;
goto Fail;
end;
table := @faze^.nameTable;
if (nameIndex < 0) or (nameIndex > table^.numNameRecords) then
begin
TT_Get_Name_Id := TT_Err_Bad_Argument;
goto Fail;
end;
rec := @table^.names^[nameIndex];
platform := rec^.platformID;
encoding := rec^.encodingID;
language := rec^.languageID;
nameid := rec^.nameID;
TT_Get_Name_ID := TT_Err_Ok;
exit;
Fail:
platform := -1;
encoding := -1;
language := -1;
nameid := -1;
end;
(*****************************************************************)
(* *)
(* *)
function TT_Get_Name_String( face : TT_Face;
nameIndex : integer;
out str : Pointer;
out len : integer ) : TT_Error;
var
faze : PFace;
table : PName_Table;
rec : PName_Record;
label
Fail;
begin
faze := PFace( face.z );
if faze = nil then
begin
TT_Get_Name_String := TT_Err_Invalid_Face_Handle;
goto Fail;
end;
table := @faze^.nameTable;
if (nameIndex < 0) or (nameIndex > table^.numNameRecords) then
begin
TT_Get_Name_String := TT_Err_Bad_Argument;
goto Fail;
end;
rec := @table^.names^[nameIndex];
str := @table^.storage^[rec^.offset];
len := rec^.length;
TT_Get_Name_String := TT_Err_Ok;
exit;
Fail:
str := nil;
len := 0;
end;
function TT_Get_Name_String(face: TT_Face; nameIndex: integer): string;
var
str: pointer;
len: integer;
begin
TT_Get_Name_String(face, nameIndex, str, len);
setlength(result,len);
if len <> 0 then move(str^, result[1], len);
end;
(*****************************************************************)
(* Access font data and copies it into user block *)
(* *)
function TT_Get_Font_Data( face : TT_Face;
tableTag : Longint;
offset : Longint;
var buffer;
var length : longint ) : TT_Error;
var
faze : PFace;
begin
faze := PFace(face.z);
if faze = nil then
begin
TT_Get_Font_Data := TT_Err_Invalid_Face_Handle;
length := 0;
end
else
begin
TT_Get_Font_Data := TT_Err_Ok;
if Load_TrueType_Any( faze, tableTag, offset, buffer, length ) then
TT_Get_Font_Data := error;
end;
end;
end.
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