ref: c5b993245eae3f0bcb75f5459699ad29e375f6f8
dir: /src/oldapi/truetype.h/
/*******************************************************************
*
* truetype.h
*
* Backwards-compatible high-level interface for the TrueType
* driver. This file is a replacement for the old "freetype.h"
* from 1.0 and 1.1. It can be used to compile applications
* and tools using the old API..
*
* Note that this (old) interface is now deprecated and won't
* be modified in the future. Developers will have to switch to
* the newer interface to get new features ( kerning, embedded
* bitmaps, etc.. ).
*
*
*
* Copyright 1996-1998 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.
*
* Note:
*
* This is the only file that should be included by client
* application sources. All other types and functions defined
* in the "tt*.h" files are library internals and should not be
* included.
*
******************************************************************/
#ifndef TRUETYPE_H
#define TRUETYPE_H
/* To make freetype.h independent from configuration files we check */
/* whether EXPORT_DEF has been defined already. */
#ifndef EXPORT_DEF
#define EXPORT_DEF extern
#endif
/* The same for TT_Text. If you define the HAVE_TT_TEXT macro, you */
/* have to provide a typedef declaration for TT_Text before */
/* including this file. */
#ifndef HAVE_TT_TEXT
#define HAVE_TT_TEXT
typedef char TT_Text; /* the data type to represent */
/* file name string elements */
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* The following types are also defined in "drivers/ttlib/ttobjs.h" */
/* We use the _TRUETYPE_ macro to prevent their redefinition when */
/* _compiling_ the backwards-compatible layer called "ttapi.c" */
/* */
#ifndef _TRUETYPE_
/*******************************************************************/
/* */
/* FreeType types definitions. */
/* */
/* All these begin with a 'TT_' prefix. */
/* */
/*******************************************************************/
typedef unsigned short TT_Bool;
typedef signed long TT_Fixed; /* Signed Fixed 16.16 Float */
typedef signed short TT_FWord; /* Distance in FUnits */
typedef unsigned short TT_UFWord; /* Unsigned distance */
typedef char TT_String;
typedef signed char TT_Char;
typedef unsigned char TT_Byte;
typedef signed short TT_Short;
typedef unsigned short TT_UShort;
typedef signed long TT_Long;
typedef unsigned long TT_ULong;
typedef int TT_Int;
typedef signed short TT_F2Dot14; /* Signed fixed float 2.14 used for */
/* unit vectors, with layout: */
/* */
/* s : 1 -- sign bit */
/* m : 1 -- integer bit */
/* f : 14 -- unsigned fractional */
/* */
/* 's:m' is the 2-bit signed int */
/* value to which the positive */
/* fractional part should be */
/* added. */
/* */
typedef signed long TT_F26Dot6; /* 26.6 fixed float, used for */
/* glyph points pixel coordinates. */
typedef signed long TT_Pos; /* point position, expressed either */
/* in fractional pixels or notional */
/* units, depending on context. */
/* For example, glyph coordinates */
/* returned by TT_Load_Glyph are */
/* expressed in font units when */
/* scaling wasn't requested, and */
/* in 26.6 fractional pixels if it */
/* was. */
struct TT_UnitVector_ /* guess what... */
{
TT_F2Dot14 x;
TT_F2Dot14 y;
};
typedef struct TT_UnitVector_ TT_UnitVector;
struct TT_Vector_ /* Simple vector type */
{
TT_F26Dot6 x;
TT_F26Dot6 y;
};
typedef struct TT_Vector_ TT_Vector;
/* A simple 2x2 matrix used for transformations. */
/* You should use 16.16 fixed floats. */
/* */
/* x' = xx*x + xy*y */
/* y' = yx*x + yy*y */
/* */
struct TT_Matrix_
{
TT_Fixed xx, xy;
TT_Fixed yx, yy;
};
typedef struct TT_Matrix_ TT_Matrix;
/* A structure used to describe a simple bounding box */
struct TT_BBox_
{
TT_Pos xMin;
TT_Pos yMin;
TT_Pos xMax;
TT_Pos yMax;
};
typedef struct TT_BBox_ TT_BBox;
#endif /* _TRUETYPE_ */
/* A structure used to describe the source glyph to the renderer. */
struct TT_Outline_
{
TT_Short n_contours; /* number of contours in glyph */
TT_UShort n_points; /* number of points in the glyph */
TT_Vector* points; /* the outline's points */
TT_Byte* flags; /* the points flags */
TT_UShort* contours; /* the contour end points */
/* The following flag indicates that the outline owns the arrays it */
/* refers to. Typically, this is true of outlines created from the */
/* TT_New_Outline() API, while it isn't for those returned by */
/* TT_Get_Glyph_Outline(). */
TT_Bool owner; /* the outline owns the coordinates, */
/* flags and contours array it uses */
/* The following flags are set automatically by */
/* TT_Get_Glyph_Outline(). Their meaning is the following: */
/* */
/* high_precision When true, the scan-line converter will use */
/* a higher precision to render bitmaps (i.e. a */
/* 1/1024 pixel precision). This is important for */
/* small ppem sizes. */
/* */
/* second_pass When true, the scan-line converter performs */
/* a second sweep phase dedicated to find */
/* vertical drop-outs. If false, only horizontal */
/* drop-outs will be checked during the first */
/* vertical sweep (yes, this is a bit confusing */
/* but it's really the way it should work). */
/* This is important for small ppems too. */
/* */
/* dropout_mode Specifies the TrueType drop-out mode to */
/* use for continuity checking. valid values */
/* are 0 (no check), 1, 2, 4, and 5. */
/* */
/* Most of the engine's users will safely ignore these fields... */
TT_Bool high_precision; /* high precision rendering */
TT_Bool second_pass; /* two sweeps rendering */
TT_Char dropout_mode; /* dropout mode */
};
typedef struct TT_Outline_ TT_Outline;
/* A structure used to return glyph metrics. */
/* */
/* The "bearingX" isn't called "left-side bearing" anymore because */
/* it has different meanings depending on the glyph's orientation. */
/* */
/* The same is true for "bearingY", which is the top-side bearing */
/* defined by the TT_Spec, i.e., the distance from the baseline to */
/* the top of the glyph's bbox. According to our current convention, */
/* this is always the same as "bbox.yMax" but we make it appear for */
/* consistency in its proper field. */
/* */
/* The "advance" width is the advance width for horizontal layout, */
/* and advance height for vertical layouts. */
/* */
/* Finally, the library (ver. 1.1) doesn't support vertical text yet */
/* but these changes were introduced to accomodate it, as it will */
/* most certainly be introduced in later releases. */
struct TT_Glyph_Metrics_
{
TT_BBox bbox; /* glyph bounding box */
TT_Pos bearingX; /* left-side bearing */
TT_Pos bearingY; /* top-side bearing, per se the TT spec */
TT_Pos advance; /* advance width (or height) */
};
/* A structure used to return horizontal _and_ vertical glyph */
/* metrics. */
/* */
/* A glyph can be used either in a horizontal or vertical layout. */
/* Its glyph metrics vary with orientation. The Big_Glyph_Metrics */
/* structure is used to return _all_ metrics in one call. */
/* */
struct TT_Big_Glyph_Metrics_
{
TT_BBox bbox; /* glyph bounding box */
TT_Pos horiBearingX; /* left side bearing in horizontal layouts */
TT_Pos horiBearingY; /* top side bearing in horizontal layouts */
TT_Pos vertBearingX; /* left side bearing in vertical layouts */
TT_Pos vertBearingY; /* top side bearing in vertical layouts */
TT_Pos horiAdvance; /* advance width for horizontal layout */
TT_Pos vertAdvance; /* advance height for vertical layout */
/* The following fields represent unhinted scaled metrics values. */
/* They can be useful for applications needing to do some device */
/* independent placement of glyphs. */
/* */
/* Applying these metrics to hinted glyphs will most surely ruin */
/* the grid fitting performed by the bytecode interpreter. These */
/* values are better used to compute accumulated positioning */
/* distances. */
TT_Pos linearHoriBearingX; /* linearly scaled horizontal lsb */
TT_Pos linearHoriAdvance; /* linearly scaled horizontal advance */
TT_Pos linearVertBearingY; /* linearly scaled vertical tsb */
TT_Pos linearVertAdvance; /* linearly scaled vertical advance */
};
typedef struct TT_Glyph_Metrics_ TT_Glyph_Metrics;
typedef struct TT_Big_Glyph_Metrics_ TT_Big_Glyph_Metrics;
/* A structure used to return instance metrics. */
struct TT_Instance_Metrics_
{
TT_F26Dot6 pointSize; /* char. size in points (1pt = 1/72 inch) */
TT_UShort x_ppem; /* horizontal pixels per EM square */
TT_UShort y_ppem; /* vertical pixels per EM square */
TT_Fixed x_scale; /* 16.16 to convert from EM units to 26.6 pix */
TT_Fixed y_scale; /* 16.16 to convert from EM units to 26.6 pix */
TT_UShort x_resolution; /* device horizontal resolution in dpi */
TT_UShort y_resolution; /* device vertical resolution in dpi */
};
typedef struct TT_Instance_Metrics_ TT_Instance_Metrics;
/* Flow constants: */
/* */
/* The flow of a bitmap refers to the way lines are oriented */
/* within the bitmap data, i.e., the orientation of the Y */
/* coordinate axis. */
/* For example, if the first bytes of the bitmap pertain to */
/* its top-most line, then the flow is 'down'. If these bytes */
/* pertain to its lowest line, the the flow is 'up'. */
#define TT_Flow_Down -1 /* bitmap is oriented from top to bottom */
#define TT_Flow_Up 1 /* bitmap is oriented from bottom to top */
#define TT_Flow_Error 0 /* an error occurred during rendering */
/* A structure used to describe the target bitmap or pixmap to the */
/* renderer. Note that there is nothing in this structure that */
/* gives the nature of the buffer. */
/* IMPORTANT NOTE: */
/* */
/* In the case of a pixmap, the 'width' and 'cols' fields must */
/* have the _same_ values, and _must_ be padded to 32-bits, i.e., */
/* be a multiple of 4. Clipping problems will arise otherwise, */
/* if not even page faults! */
/* */
/* The typical settings are: */
/* */
/* - for an WxH bitmap: */
/* */
/* rows = H */
/* cols = (W+7)/8 */
/* width = W */
/* flow = your_choice */
/* */
/* - for an WxH pixmap: */
/* */
/* rows = H */
/* cols = (W+3) & ~3 */
/* width = cols */
/* flow = your_choice */
struct TT_Raster_Map_
{
int rows; /* number of rows */
int cols; /* number of columns (bytes) per row */
int width; /* number of pixels per line */
int flow; /* bitmap orientation */
void* bitmap; /* bit/pixmap buffer */
long size; /* bit/pixmap size in bytes */
};
typedef struct TT_Raster_Map_ TT_Raster_Map;
/* The following tables are also defined in "drivers/ttlib/ttobjs.h" */
/* We use the _TRUETYPE_ macro to prevent their redefinition when */
/* _compiling_ the backwards-compatible layer called "oldapi.c" */
/* */
#ifndef _TRUETYPE_
/* ------- The font header TrueType table structure ----- */
struct TT_Header_
{
TT_Fixed Table_Version;
TT_Fixed Font_Revision;
TT_Long CheckSum_Adjust;
TT_Long Magic_Number;
TT_UShort Flags;
TT_UShort Units_Per_EM;
TT_Long Created [2];
TT_Long Modified[2];
TT_FWord xMin;
TT_FWord yMin;
TT_FWord xMax;
TT_FWord yMax;
TT_UShort Mac_Style;
TT_UShort Lowest_Rec_PPEM;
TT_Short Font_Direction;
TT_Short Index_To_Loc_Format;
TT_Short Glyph_Data_Format;
};
typedef struct TT_Header_ TT_Header;
/* ------- The horizontal header TrueType table structure ----- */
/*******************************************************/
/* This structure is the one defined by the TrueType */
/* specification, plus two fields used to link the */
/* font-units metrics to the header. */
struct TT_Horizontal_Header_
{
TT_Fixed Version;
TT_FWord Ascender;
TT_FWord Descender;
TT_FWord Line_Gap;
TT_UFWord advance_Width_Max; /* advance width maximum */
TT_FWord min_Left_Side_Bearing; /* minimum left-sb */
TT_FWord min_Right_Side_Bearing; /* minimum right-sb */
TT_FWord xMax_Extent; /* xmax extents */
TT_FWord caret_Slope_Rise;
TT_FWord caret_Slope_Run;
TT_Short caret_Offset; /* only used in vertical header */
TT_Short Reserved[4];
TT_Short metric_Data_Format;
TT_UShort number_Of_HMetrics;
/* The following fields are not defined by the TrueType specification */
/* but they're used to connect the metrics header to the relevant */
/* "HMTX" or "VMTX" table. */
void* long_metrics;
void* short_metrics;
};
/*******************************************************/
/* This structure is the one defined by the TrueType */
/* specification. Note that it has exactly the same */
/* layout as the horizontal header (both are loaded */
/* by the same function). */
struct TT_Vertical_Header_
{
TT_Fixed Version;
TT_FWord Ascender;
TT_FWord Descender;
TT_FWord Line_Gap;
TT_UFWord advance_Height_Max; /* advance height maximum */
TT_FWord min_Top_Side_Bearing; /* minimum left-sb or top-sb */
TT_FWord min_Bottom_Side_Bearing; /* minimum right-sb or bottom-sb */
TT_FWord yMax_Extent; /* xmax or ymax extents */
TT_FWord caret_Slope_Rise;
TT_FWord caret_Slope_Run;
TT_FWord caret_Offset;
TT_Short Reserved[4];
TT_Short metric_Data_Format;
TT_UShort number_Of_VMetrics;
/* The following fields are not defined by the TrueType specification */
/* but they're used to connect the metrics header to the relevant */
/* "HMTX" or "VMTX" table. */
void* long_metrics;
void* short_metrics;
};
typedef struct TT_Horizontal_Header_ TT_Horizontal_Header;
typedef struct TT_Vertical_Header_ TT_Vertical_Header;
/* ----------- OS/2 Table ----------------------------- */
struct TT_OS2_
{
TT_UShort version; /* 0x0001 */
TT_FWord xAvgCharWidth;
TT_UShort usWeightClass;
TT_UShort usWidthClass;
TT_Short fsType;
TT_FWord ySubscriptXSize;
TT_FWord ySubscriptYSize;
TT_FWord ySubscriptXOffset;
TT_FWord ySubscriptYOffset;
TT_FWord ySuperscriptXSize;
TT_FWord ySuperscriptYSize;
TT_FWord ySuperscriptXOffset;
TT_FWord ySuperscriptYOffset;
TT_FWord yStrikeoutSize;
TT_FWord yStrikeoutPosition;
TT_Short sFamilyClass;
TT_Byte panose[10];
TT_ULong ulUnicodeRange1; /* Bits 0-31 */
TT_ULong ulUnicodeRange2; /* Bits 32-63 */
TT_ULong ulUnicodeRange3; /* Bits 64-95 */
TT_ULong ulUnicodeRange4; /* Bits 96-127 */
TT_Char achVendID[4];
TT_UShort fsSelection;
TT_UShort usFirstCharIndex;
TT_UShort usLastCharIndex;
TT_Short sTypoAscender;
TT_Short sTypoDescender;
TT_Short sTypoLineGap;
TT_UShort usWinAscent;
TT_UShort usWinDescent;
/* only version 1 tables: */
TT_ULong ulCodePageRange1; /* Bits 0-31 */
TT_ULong ulCodePageRange2; /* Bits 32-63 */
};
typedef struct TT_OS2_ TT_OS2;
/* ----------- Postscript table ------------------------ */
struct TT_Postscript_
{
TT_Fixed FormatType;
TT_Fixed italicAngle;
TT_FWord underlinePosition;
TT_FWord underlineThickness;
TT_ULong isFixedPitch;
TT_ULong minMemType42;
TT_ULong maxMemType42;
TT_ULong minMemType1;
TT_ULong maxMemType1;
/* Glyph names follow in the file, but we don't */
/* load them by default. See the ftxpost.c extension. */
};
typedef struct TT_Postscript_ TT_Postscript;
/* ------------ horizontal device metrics "hdmx" ---------- */
struct TT_Hdmx_Record_
{
TT_Byte ppem;
TT_Byte max_width;
TT_Byte* widths;
};
typedef struct TT_Hdmx_Record_ TT_Hdmx_Record;
struct TT_Hdmx_
{
TT_UShort version;
TT_Short num_records;
TT_Hdmx_Record* records;
};
typedef struct TT_Hdmx_ TT_Hdmx;
#else
typedef TT_HoriHeader TT_Horizontal_Header;
typedef TT_VertHeader TT_Vertical_Header;
#endif /* _TRUETYPE_ */
/* A structure used to describe face properties. */
/* be aware that this is not the same structure as the one define */
/* in "freetype/ttlib/ttdriver.h". A suitable conversion is performed */
/* in "oldapi/ttapi.c" to build a binary driver that is backwards */
/* compatible with FreeType 1.1, in the function TT_Get_Face_Properties */
struct TT_Face_Properties_
{
TT_UShort num_Glyphs; /* number of glyphs in face */
TT_UShort max_Points; /* maximum number of points in a glyph */
TT_UShort max_Contours; /* maximum number of contours in a glyph */
TT_UShort num_CharMaps; /* number of charmaps in the face */
TT_UShort num_Names; /* number of name records in the face */
TT_ULong num_Faces; /* 1 for normal TrueType files, and the */
/* number of embedded faces for TrueType */
/* collections */
TT_Header* header; /* TrueType header table */
TT_Horizontal_Header* horizontal; /* TrueType horizontal header */
TT_OS2* os2; /* TrueType OS/2 table */
TT_Postscript* postscript; /* TrueType Postscript table */
TT_Hdmx* hdmx;
TT_Vertical_Header* vertical; /* TT Vertical header, if present */
};
typedef struct TT_Face_Properties_ TT_Face_Properties;
/***********************************************************************/
/* */
/* <Type> TT_Engine */
/* */
/* <Description> */
/* A handle to a TrueType driver/engine instance. Engine objects */
/* can be created with the TT_New_Engine and TT_Build_Engine APIs */
/* */
/* TT_Done_Engine will destroy an engine, as well as all the */
/* objects that were created within it. */
/* */
typedef struct TT_EngineRec_ *TT_Engine;
/* Note : The type TT_Engine is not defined in "drivers/ttlib/ttobjs.h" */
/* The TT_Face type is already defined in "drivers/ttlib/ttobjs.h" */
/* We use the _TRUETYPE_ macro to prevent their redefinition when */
/* _compiling_ the backwards-compatible layer called "oldapi.c" */
/* */
#ifndef _TRUETYPE_
/***********************************************************************/
/* */
/* <Type> TT_Face */
/* */
/* <Description> */
/* A handle to a TrueType face/font object. A TT_Face encapsulates */
/* the resolution and scaling independent parts of a TrueType font */
/* file. Instances (a.k.a. fontsizes) and glyph objects must be */
/* created from them before a glyph can be loaded in memory. */
/* */
/* They are created through TT_New_Face and destroyed with */
/* TT_Done_Face. This will destroy all instance and glyph objects */
/* */
typedef struct TT_FaceRec_* TT_Face;
#endif /* _TRUETYPE_ */
/***********************************************************************/
/* */
/* <Type> TT_Instance */
/* */
/* <Description> */
/* A handle to a TrueType instance/fontsize object. A TT_Instance */
/* encapsulates all the resolution and scaling dependent part of */
/* a given font size, but doesn't contain any glyph. They must be */
/* used with glyph objects in order to load glyph objects from */
/* a TT file. */
/* */
/* They are created from face objects with TT_New_Instance, and */
/* destroyed with TT_Done_Instance */
/* */
/* A fresh new instance has a default resolution of 96x96 dpi, */
/* and a default point size of 10 pt. Each of these can be changed */
/* dynamically with various APIs defined below.. */
/* */
typedef struct TT_InstanceRec_* TT_Instance;
/* Note: The TT_Instance type is not defined in "drivers/ttlib/ttobjs.h" */
/***********************************************************************/
/* */
/* <Type> TT_Glyph */
/* */
/* <Description> */
/* A handle to a TrueType glyph object. A glyph object acts as a */
/* container for any of the glyphs of a given face object. It */
/* encapsulates glyph metrics as well as outline space sized large */
/* enough to allow the loading of any glyph without further */
/* allocation. A glyph object doesn't contain any bitmap or */
/* pixmap data/buffer. */
/* */
/* They are created from face objects with TT_New_Glyph, and */
/* destroyed with TT_Done_Glyph */
/* */
/* One can create several glyph objects per face, and use */
/* a single instance to load multiple glyphs, even concurrently */
/* in thread-safe and reentrant modes.. */
/* */
typedef struct TT_GlyphRec_* TT_Glyph;
/* Note: the TT_Glyph type is not defined in "drivers/ttlib/ttobjs.h" */
/* The TT_CharMap type is already defined in "drivers/ttlib/ttobjs.h" */
/* We use the _TRUETYPE_ macro to prevent their redefinition when */
/* _compiling_ the backwards-compatible layer called "oldapi.c" */
/* */
#ifndef _TRUETYPE_
/***********************************************************************/
/* */
/* <Type> TT_CharMap */
/* */
/* <Description> */
/* A handle to a TrueType character mapping object. These objects */
/* are used to convert character codes in a specific locale or */
/* encoding into font/face glyph indexes. */
/* */
/* The list of character maps found within a face can be */
/* enumerated with API functions defined below. An CharMap object */
/* is created with TT_New_CharMap. They are destroyed automatically */
/* when their parent face objects are discarded. */
/* */
typedef struct TT_CharMapRec_* TT_CharMap;
typedef long TT_Error;
#endif /* _TRUETYPE_ */
EXPORT_DEF
const TT_Instance TT_Null_Instance;
/*******************************************************************/
/* */
/* Postscript Names extension */
/* */
/*******************************************************************/
#define TT_Err_Invalid_Post_Table_Format 0x0B00
#define TT_Err_Invalid_Post_Table 0x0B01
/* Initialise the Postscript Names extension */
EXPORT_DEF
TT_Error TT_Init_Post_Extension( TT_Engine engine );
/* Load the Postscript Names table - notice that the 'post' parameter */
/* will be ignored in 2.0. */
EXPORT_DEF
TT_Error TT_Load_PS_Names( TT_Face face,
void* post );
/* Gets the postscript name of a single glyph */
EXPORT_DEF
TT_Error TT_Get_PS_Name( TT_Face face,
TT_UShort index,
TT_String** PSname );
/*******************************************************************/
/* */
/* Embedded Bitmaps (sbits) extension */
/* */
/*******************************************************************/
#ifndef _TRUETYPE_
/*************************************************************/
/* */
/* <Struct> TT_SBit_Metrics */
/* */
/* <Description> */
/* A structure used to hold the big metrics of a given */
/* glyph bitmap in a TrueType or OpenType font. These */
/* are usually found in the "EBDT" table. */
/* */
/* <Fields> */
/* height :: glyph height in pixels */
/* width :: glyph width in pixels */
/* */
/* horiBearingX :: horizontal left bearing */
/* horiBearingY :: horizontal top bearing */
/* horiAdvance :: horizontal advance */
/* */
/* vertBearingX :: vertical left bearing */
/* vertBearingY :: vertical top bearing */
/* vertAdvance :: vertical advance */
/* */
typedef struct TT_SBit_Metrics_
{
TT_Byte height;
TT_Byte width;
TT_Char horiBearingX;
TT_Char horiBearingY;
TT_Byte horiAdvance;
TT_Char vertBearingX;
TT_Char vertBearingY;
TT_Byte vertAdvance;
} TT_SBit_Metrics;
/*************************************************************/
/* */
/* <Struct> TT_SBit_Small_Metrics */
/* */
/* <Description> */
/* A structure used to hold the small metrics of a given */
/* glyph bitmap in a TrueType or OpenType font. These */
/* are usually found in the "EBDT" table. */
/* */
/* <Fields> */
/* height :: glyph height in pixels */
/* width :: glyph width in pixels */
/* */
/* bearingX :: left-side bearing */
/* bearingY :: top-side bearing */
/* advance :: advance width or height */
/* */
typedef struct TT_SBit_Small_Metrics_
{
TT_Byte height;
TT_Byte width;
TT_Char bearingX;
TT_Char bearingY;
TT_Byte advance;
} TT_SBit_Small_Metrics;
/*************************************************************/
/* */
/* <Struct> TT_SBit_Line_Metrics */
/* */
/* <Description> */
/* A structure used to describe the text line metrics of */
/* a given bitmap strike, for either an horizontal or */
/* vertical layout. */
/* */
/* <Fields> */
/* ascender :: ascender in pixels */
/* descender :: descender in pixels */
/* max_width :: maximum glyph width in pixels */
/* */
/* caret_slope_enumerator :: ? */
/* caret_slope_denominator :: ? */
/* caret_offset :: ? */
/* */
/* min_origin_SB :: ? */
/* min_advance_SB :: ? */
/* max_before_BL :: ? */
/* min_after_BL :: ? */
/* */
typedef struct TT_SBit_Line_Metrics_
{
TT_Char ascender;
TT_Char descender;
TT_Byte max_width;
TT_Char caret_slope_numerator;
TT_Char caret_slope_denominator;
TT_Char caret_offset;
TT_Char min_origin_SB;
TT_Char min_advance_SB;
TT_Char max_before_BL;
TT_Char min_after_BL;
TT_Char pads[2];
} TT_SBit_Line_Metrics;
/*************************************************************/
/* */
/* <Struct> TT_SBit_Range */
/* */
/* <Description> */
/* A TrueType/OpenType subIndexTable as defined in the */
/* "EBLC" or "bloc" tables. */
/* */
/* <Fields> */
/* */
/* first_glyph :: first glyph index in range */
/* last_glyph :: last glyph index in range */
/* */
/* index_format :: format of index table. valid */
/* values are 1 to 5. */
/* */
/* image_format :: format of 'EBDT' image data */
/* image_offset :: offset to image data in 'EBDT' */
/* */
/* image_size :: for index formats 2 and 5. This is */
/* the size in bytes of each glyph bitmap */
/* glyph bitmap */
/* */
/* big_metrics :: for index formats 2 and 5. This is */
/* the big metrics for each glyph bitmap */
/* */
/* num_glyphs :: for index formats 4 and 5. This is */
/* the number of glyphs in the code */
/* array. */
/* */
/* glyph_offsets :: for index formats 1 and 3. */
/* glyph_codes :: for index formats 4 and 5. */
/* */
/* table_offset :: offset of index table in 'EBLC' table */
/* only used during strike loading.. */
/* */
typedef struct TT_SBit_Range
{
TT_UShort first_glyph;
TT_UShort last_glyph;
TT_UShort index_format;
TT_UShort image_format;
TT_ULong image_offset;
TT_ULong image_size;
TT_SBit_Metrics metrics;
TT_ULong num_glyphs;
TT_ULong* glyph_offsets;
TT_UShort* glyph_codes;
TT_ULong table_offset;
} TT_SBit_Range;
/*************************************************************/
/* */
/* <Struct> TT_SBit_Strike */
/* */
/* <Description> */
/* A structure used describe a given bitmap strike in the */
/* "EBLC" or "bloc" tables. */
/* */
/* <Fields> */
/* */
/* num_index_ranges :: number of index ranges */
/* index_ranges :: array of glyph index ranges */
/* */
/* color_ref :: unused. color reference ?? */
/* hori :: line metrics for horizontal layouts. */
/* vert :: line metrics for vertical layouts. */
/* */
/* start_glyph :: lowest glyph index for this strike. */
/* end_glyph :: higher glyph index for this strike. */
/* */
/* x_ppem :: horizontal pixels per EM */
/* y_ppem :: vertical pixels per EM */
/* bit_depth :: bit depth. valid values are 1, 2, 4 & 8 */
/* flags :: vertical or horizontal ? */
/* */
typedef struct TT_SBit_Strike_
{
TT_Int num_ranges;
TT_SBit_Range* sbit_ranges;
TT_ULong ranges_offset;
TT_ULong color_ref;
TT_SBit_Line_Metrics hori;
TT_SBit_Line_Metrics vert;
TT_UShort start_glyph;
TT_UShort end_glyph;
TT_Byte x_ppem;
TT_Byte y_ppem;
TT_Byte bit_depth;
TT_Char flags;
} TT_SBit_Strike;
/*************************************************************/
/* */
/* <Struct> TT_SBit_Component */
/* */
/* <Description> */
/* A simple structure to describe a compound sbit element */
/* */
/* <Fields> */
/* glyph_code :: element's glyph index */
/* x_offset :: element's left bearing */
/* y_offset :: element's top bearing */
/* */
typedef struct TT_SBit_Component_
{
TT_UShort glyph_code;
TT_Char x_offset;
TT_Char y_offset;
} TT_SBit_Component;
/*************************************************************/
/* */
/* <Struct> TT_SBit_Scale */
/* */
/* <Description> */
/* A structure used describe a given bitmap scaling */
/* table, asdefined for the "EBSC" table. */
/* */
/* <Fields> */
/* */
/* hori :: horizontal line metrics */
/* vert :: vertical line metrics */
/* */
/* x_ppem :: horizontal pixels per EM */
/* y_ppem :: vertical pixels per EM */
/* */
/* x_ppem_substitute :: substitution x_ppem */
/* y_ppem_substitute :: substitution y_ppem */
/* */
typedef struct TT_SBit_Scale_
{
TT_SBit_Line_Metrics hori;
TT_SBit_Line_Metrics vert;
TT_Byte x_ppem;
TT_Byte y_ppem;
TT_Byte x_ppem_substitute;
TT_Byte y_ppem_substitute;
} TT_SBit_Scale;
#endif /* _TRUETYPE_ */
/*************************************************************/
/* */
/* <Struct> TT_SBit_Image */
/* */
/* <Description> */
/* A structure used to describe a given embedded bitmap */
/* image. */
/* */
/* <Fields> */
/* map :: bitmap descriptor */
/* bit_depth :: pixel bit depth */
/* metrics :: glyph metrics for the bitmap */
/* */
typedef struct TT_SBit_Image_
{
TT_Raster_Map map;
int bit_depth;
TT_Big_Glyph_Metrics metrics;
} TT_SBit_Image;
/*************************************************************/
/* */
/* <Struct> TT_EBLC */
/* */
/* <Description> */
/* A structure used to describe the "EBLC" table from */
/* a TrueTYpe font. */
/* */
/* <Fields> */
/* */
/* version :: version number of the EBLC table */
/* */
/* num_strikes :: the number of strikes, i.e. bitmap */
/* sizes, present in this font */
/* */
/* strikes :: array of strikes */
/* */
typedef struct TT_EBLC_
{
TT_ULong version;
TT_ULong num_strikes;
TT_SBit_Strike* strikes;
} TT_EBLC;
/*************************************************************/
/* */
/* <Function> */
/* TT_Init_SBit_Extension */
/* */
/* <Description> */
/* Initialise the embedded bitmaps extension for the */
/* FreeType engine. */
/* */
/* <Input> */
/* engine :: handle to current FreeType library instance */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
EXPORT_DEF
TT_Error TT_Init_SBit_Extension( TT_Engine engine );
/*************************************************************/
/* */
/* <Function> */
/* TT_Get_Face_Bitmaps */
/* */
/* <Description> */
/* Loads the "EBLC" table from a font file, if any. */
/* */
/* <Input> */
/* face :: handle to the source TrueType font/face */
/* */
/* <Output> */
/* eblc_table :: a descriptor for the EBLC table */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* This function returns TT_Err_Table_Missing when the */
/* font contains no embedded bitmaps. All fields in */
/* "eblc_table" will then be set to 0. */
/* */
EXPORT_DEF
TT_Error TT_Get_Face_Bitmaps( TT_Face face,
TT_EBLC *eblc_table );
/*************************************************************/
/* */
/* <Function> */
/* TT_New_SBit_Image */
/* */
/* <Description> */
/* Allocates a new embedded bitmap container */
/* */
/* <Output> */
/* image :: sbit image */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
EXPORT_DEF
TT_Error TT_New_SBit_Image( TT_SBit_Image* *image );
/*************************************************************/
/* */
/* <Function> */
/* TT_Done_SBit_Image */
/* */
/* <Description> */
/* Releases an embedded bitmap container */
/* */
/* <Input> */
/* image :: sbit image */
/* */
EXPORT_DEF
void TT_Done_SBit_Image( TT_SBit_Image* image );
/*************************************************************/
/* */
/* <Function> */
/* TT_Load_Glyph_Bitmap */
/* */
/* <Description> */
/* Loads a given glyph embedded bitmap */
/* */
/* <Input> */
/* face :: handle to the source TrueType font/face */
/* instance :: current size/transform instance */
/* glyph_index :: index of source glyph */
/* bitmap :: target embedded bitmap descriptor */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* This function returns an error if there is no */
/* embedded bitmap for the glyph at the given */
/* instance. */
/* */
EXPORT_DEF
TT_Error TT_Load_Glyph_Bitmap( TT_Face face,
TT_Instance instance,
TT_UShort glyph_index,
TT_SBit_Image* bitmap );
/*******************************************************************/
/* */
/* FreeType API */
/* */
/* All these begin with a 'TT_' prefix. */
/* */
/* Most of them are implemented in the 'ttapi.c' source file. */
/* */
/*******************************************************************/
/* Initialize the engine. */
EXPORT_DEF
TT_Error TT_Init_FreeType( TT_Engine* engine );
/* Finalize the engine, and release all allocated objects. */
EXPORT_DEF
TT_Error TT_Done_FreeType( TT_Engine engine );
/* Set the gray level palette. This is an array of 5 bytes used */
/* to produce the font smoothed pixmaps. By convention: */
/* */
/* palette[0] = background (white) */
/* palette[1] = light */
/* palette[2] = medium */
/* palette[3] = dark */
/* palette[4] = foreground (black) */
/* */
EXPORT_DEF
TT_Error TT_Set_Raster_Gray_Palette( TT_Engine engine,
const TT_Byte* palette );
/* ----------------------- face management ----------------------- */
/* Open a new TrueType font file, and returns a handle for */
/* it in variable '*face'. */
/* Note: The file can be either a TrueType file (*.ttf) or */
/* a TrueType collection (*.ttc, in this case, only */
/* the first face is opened). The number of faces in */
/* the same collection can be obtained in the face's */
/* properties, using TT_Get_Face_Properties() and the */
/* 'max_Faces' field. */
EXPORT_DEF
TT_Error TT_Open_Face( TT_Engine engine,
const TT_Text* fontPathName,
TT_Face* face );
/* Open a TrueType font file located inside a collection. */
/* The font is assigned by its index in 'fontIndex'. */
EXPORT_DEF
TT_Error TT_Open_Collection( TT_Engine engine,
const TT_Text* collectionPathName,
TT_ULong fontIndex,
TT_Face* face );
/* Return face properties in the 'properties' structure. */
EXPORT_DEF
TT_Error TT_Get_Face_Properties( TT_Face face,
TT_Face_Properties* properties );
/* Set a face object's generic pointer */
EXPORT_DEF
TT_Error TT_Set_Face_Pointer( TT_Face face,
void* data );
/* Get a face object's generic pointer */
EXPORT_DEF
void* TT_Get_Face_Pointer( TT_Face face );
/* Close a face's file handle to save system resources. The file */
/* will be re-opened automatically on the next disk access. */
EXPORT_DEF
TT_Error TT_Flush_Face( TT_Face face );
/* Get a face's glyph metrics expressed in font units. Returns any */
/* number of arrays. Set the fields to NULL if you're not interested */
/* by a given array. */
EXPORT_DEF
TT_Error TT_Get_Face_Metrics( TT_Face face,
TT_UShort firstGlyph,
TT_UShort lastGlyph,
TT_Short* leftBearings,
TT_UShort* widths,
TT_Short* topBearings,
TT_UShort* heights );
/* Close a given font object, destroying all associated */
/* instances. */
EXPORT_DEF
TT_Error TT_Close_Face( TT_Face face );
/* Get font or table data. */
EXPORT_DEF
TT_Error TT_Get_Font_Data( TT_Face face,
TT_ULong tag,
TT_Long offset,
void* buffer,
TT_Long* length );
/* A simple macro to build table tags from ASCII chars */
#define MAKE_TT_TAG( _x1, _x2, _x3, _x4 ) \
(((TT_ULong)_x1 << 24) | \
((TT_ULong)_x2 << 16) | \
((TT_ULong)_x3 << 8) | \
(TT_ULong)_x4)
/* ----------------------- instance management -------------------- */
/* Open a new font instance and returns an instance handle */
/* for it in '*instance'. */
EXPORT_DEF
TT_Error TT_New_Instance( TT_Face face,
TT_Instance* instance );
/* Set device resolution for a given instance. The values are */
/* given in dpi (Dots Per Inch). Default is 96 in both directions. */
EXPORT_DEF
TT_Error TT_Set_Instance_Resolutions( TT_Instance instance,
TT_UShort xResolution,
TT_UShort yResolution );
/* Set the pointsize for a given instance. Default is 10pt. */
EXPORT_DEF
TT_Error TT_Set_Instance_CharSize( TT_Instance instance,
TT_F26Dot6 charSize );
EXPORT_DEF
TT_Error TT_Set_Instance_CharSizes( TT_Instance instance,
TT_F26Dot6 charWidth,
TT_F26Dot6 charHeight );
#define TT_Set_Instance_PointSize( ins, ptsize ) \
TT_Set_Instance_CharSize( ins, ptsize*64 )
EXPORT_DEF
TT_Error TT_Set_Instance_PixelSizes( TT_Instance instance,
TT_UShort pixelWidth,
TT_UShort pixelHeight,
TT_F26Dot6 pointSize );
/* This function has been deprecated !! Do not use it, as it */
/* doesn't work reliably. You can perfectly control hinting */
/* yourself when loading glyphs, then apply transforms as usual */
EXPORT_DEF
TT_Error TT_Set_Instance_Transform_Flags( TT_Instance instance,
TT_Bool rotated,
TT_Bool stretched );
/* Return instance metrics in 'metrics'. */
EXPORT_DEF
TT_Error TT_Get_Instance_Metrics( TT_Instance instance,
TT_Instance_Metrics* metrics );
/* Set an instance's generic pointer. */
EXPORT_DEF
TT_Error TT_Set_Instance_Pointer( TT_Instance instance,
void* data );
/* Get an instance's generic pointer. */
EXPORT_DEF
void* TT_Get_Instance_Pointer( TT_Instance instance );
/* Close a given instance object, destroying all associated data. */
EXPORT_DEF
TT_Error TT_Done_Instance( TT_Instance instance );
/* ----------------------- glyph management ----------------------- */
/* Create a new glyph object related to the given 'face'. */
EXPORT_DEF
TT_Error TT_New_Glyph( TT_Face face,
TT_Glyph* glyph );
/* Discard (and destroy) a given glyph object. */
EXPORT_DEF
TT_Error TT_Done_Glyph( TT_Glyph glyph );
#define TTLOAD_SCALE_GLYPH 1
#define TTLOAD_HINT_GLYPH 2
#define TTLOAD_DEFAULT (TTLOAD_SCALE_GLYPH | TTLOAD_HINT_GLYPH)
/* Load and process (scale/transform and hint) a glyph from the */
/* given 'instance'. The glyph and instance handles must be */
/* related to the same face object. The glyph index can be */
/* computed with a call to TT_Char_Index(). */
/* The 'load_flags' argument is a combination of the macros */
/* TTLOAD_SCALE_GLYPH and TTLOAD_HINT_GLYPH. Hinting will be */
/* applied only if the scaling is selected. */
/* When scaling is off (i.e., load_flags = 0), the returned */
/* outlines are in EM square coordinates (also called FUnits), */
/* extracted directly from the font with no hinting. */
/* Other glyph metrics are also in FUnits. */
/* When scaling is on, the returned outlines are in fractional */
/* pixel units (i.e. TT_F26Dot6 = 26.6 fixed floats). */
/* NOTE: The glyph index must be in the range 0..num_glyphs-1 */
/* where 'num_glyphs' is the total number of glyphs in */
/* the font file (given in the face properties). */
EXPORT_DEF
TT_Error TT_Load_Glyph( TT_Instance instance,
TT_Glyph glyph,
TT_UShort glyphIndex,
TT_UShort loadFlags );
/* Return glyph outline pointers in 'outline'. Note that the returned */
/* pointers are owned by the glyph object, and will be destroyed with */
/* it. The client application should _not_ change the pointers. */
EXPORT_DEF
TT_Error TT_Get_Glyph_Outline( TT_Glyph glyph,
TT_Outline* outline );
/* Copy the glyph metrics into 'metrics'. */
EXPORT_DEF
TT_Error TT_Get_Glyph_Metrics( TT_Glyph glyph,
TT_Glyph_Metrics* metrics );
/* Copy the glyph's big metrics into 'metrics'. */
/* Necessary to obtain vertical metrics. */
EXPORT_DEF
TT_Error TT_Get_Glyph_Big_Metrics( TT_Glyph glyph,
TT_Big_Glyph_Metrics* metrics );
/* Render the glyph into a bitmap, with given position offsets. */
/* Note: Only use integer pixel offsets to preserve the fine */
/* hinting of the glyph and the 'correct' anti-aliasing */
/* (where vertical and horizontal stems aren't grayed). */
/* This means that xOffset and yOffset must be multiples */
/* of 64! */
EXPORT_DEF
TT_Error TT_Get_Glyph_Bitmap( TT_Glyph glyph,
TT_Raster_Map* map,
TT_F26Dot6 xOffset,
TT_F26Dot6 yOffset );
/* Render the glyph into a pixmap, with given position offsets. */
/* Note : Only use integer pixel offsets to preserve the fine */
/* hinting of the glyph and the 'correct' anti-aliasing */
/* (where vertical and horizontal stems aren't grayed). */
/* This means that xOffset and yOffset must be multiples */
/* of 64! */
EXPORT_DEF
TT_Error TT_Get_Glyph_Pixmap( TT_Glyph glyph,
TT_Raster_Map* map,
TT_F26Dot6 xOffset,
TT_F26Dot6 yOffset );
/* ----------------------- outline support ------------------------ */
/* Allocate a new outline. Reserve space for 'numPoints' and */
/* 'numContours'. */
EXPORT_DEF
TT_Error TT_New_Outline( TT_UShort numPoints,
TT_Short numContours,
TT_Outline* outline );
/* Release an outline. */
EXPORT_DEF
TT_Error TT_Done_Outline( TT_Outline* outline );
/* Copy an outline into another one. */
EXPORT_DEF
TT_Error TT_Copy_Outline( TT_Outline* source,
TT_Outline* target );
/* Render an outline into a bitmap. */
EXPORT_DEF
TT_Error TT_Get_Outline_Bitmap( TT_Engine engine,
TT_Outline* outline,
TT_Raster_Map* map );
/* Render an outline into a pixmap -- note that this function uses */
/* a different pixel scale, where 1.0 pixels = 128 XXXX */
EXPORT_DEF
TT_Error TT_Get_Outline_Pixmap( TT_Engine engine,
TT_Outline* outline,
TT_Raster_Map* map );
/* Return an outline's bounding box -- this function is slow as it */
/* performs a complete scan-line process, without drawing, to get */
/* the most accurate values. XXXX */
EXPORT_DEF
TT_Error TT_Get_Outline_BBox( TT_Outline* outline,
TT_BBox* bbox );
/* Apply a transformation to a glyph outline. */
EXPORT_DEF
void TT_Transform_Outline( TT_Outline* outline,
TT_Matrix* matrix );
/* Apply a translation to a glyph outline. */
EXPORT_DEF
void TT_Translate_Outline( TT_Outline* outline,
TT_F26Dot6 xOffset,
TT_F26Dot6 yOffset );
/* Apply a transformation to a vector. */
EXPORT_DEF
void TT_Transform_Vector( TT_F26Dot6* x,
TT_F26Dot6* y,
TT_Matrix* matrix );
/* Multiply a matrix with another -- computes "b := a*b". */
EXPORT_DEF
void TT_Matrix_Multiply( TT_Matrix* a,
TT_Matrix* b );
/* Invert a transformation matrix. */
EXPORT_DEF
TT_Error TT_Matrix_Invert( TT_Matrix* matrix );
/* Compute A*B/C with 64 bits intermediate precision. */
EXPORT_DEF
TT_Long TT_MulDiv( TT_Long A, TT_Long B, TT_Long C );
/* Compute A*B/0x10000 with 64 bits intermediate precision. */
/* Useful to multiply by a 16.16 fixed float value. */
EXPORT_DEF
TT_Long TT_MulFix( TT_Long A, TT_Long B );
/* ----------------- character mappings support ------------- */
/* Return the number of character mappings found in this file. */
/* Returns -1 in case of failure (invalid face handle). */
/* */
/* DON'T USE THIS FUNCTION! IT HAS BEEN DEPRECATED! */
/* */
/* It is retained for backwards compatibility only and will */
/* fail on 16bit systems. */
/* */
/* You can now get the charmap count in the "num_CharMaps" */
/* field of a face's properties. */
/* */
EXPORT_DEF
int TT_Get_CharMap_Count( TT_Face face );
/* Return the ID of charmap number 'charmapIndex' of a given face */
/* used to enumerate the charmaps present in a TrueType file. */
EXPORT_DEF
TT_Error TT_Get_CharMap_ID( TT_Face face,
TT_UShort charmapIndex,
TT_UShort* platformID,
TT_UShort* encodingID );
/* Look up the character maps found in 'face' and return a handle */
/* for the one matching 'platformID' and 'platformEncodingID' */
/* (see the TrueType specs relating to the 'cmap' table for */
/* information on these ID numbers). Returns an error code. */
/* In case of failure, the handle is set to NULL and is invalid. */
EXPORT_DEF
TT_Error TT_Get_CharMap( TT_Face face,
TT_UShort charmapIndex,
TT_CharMap* charMap );
/* Translate a character code through a given character map */
/* and return the corresponding glyph index to be used in */
/* a TT_Load_Glyph call. This function returns 0 in case of */
/* failure. */
EXPORT_DEF
TT_UShort TT_Char_Index( TT_CharMap charMap,
TT_UShort charCode );
/* --------------------- names table support ------------------- */
/* Return the number of name strings found in the name table. */
/* Returns -1 in case of failure (invalid face handle). */
/* */
/* DON'T USE THIS FUNCTION! IT HAS BEEN DEPRECATED! */
/* */
/* It is retained for backwards compatibility only and will */
/* fail on 16bit systems. */
/* */
/* You can now get the number of name strings in a face with */
/* the "num_Names" field of its properties.. */
/* */
EXPORT_DEF
int TT_Get_Name_Count( TT_Face face );
/* Return the ID of the name number 'nameIndex' of a given face */
/* used to enumerate the charmaps present in a TrueType file. */
EXPORT_DEF
TT_Error TT_Get_Name_ID( TT_Face face,
TT_UShort nameIndex,
TT_UShort* platformID,
TT_UShort* encodingID,
TT_UShort* languageID,
TT_UShort* nameID );
/* Return the address and length of the name number 'nameIndex' */
/* of a given face. The string is part of the face object and */
/* shouldn't be written to or released. */
/* Note that if for an invalid platformID a null pointer will */
/* be returned. */
EXPORT_DEF
TT_Error TT_Get_Name_String( TT_Face face,
TT_UShort nameIndex,
TT_String** stringPtr, /* pointer address */
TT_UShort* length ); /* string length
address */
#ifdef __cplusplus
}
#endif
#endif /* TRUETYPE_H */
/* END */