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-/*******************************************************************
- *
- * ftxsbit.h
- *
- * embedded bitmap support API extension
- *
- * Copyright 1996-2001 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.
- *
- *
- * This extension is used to load the embedded bitmaps present
- * in certain TrueType files.
- *
- ******************************************************************/
-
-#ifndef FTXSBIT_H
-#define FTXSBIT_H
-
-#include "freetype.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
- /*************************************************************/
- /* */
- /* <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 horizontal or */
- /* vertical layout. */
- /* */
- /* <Fields> */
- /* ascender :: ascender in pixels */
- /* descender :: descender in pixels */
- /* max_width :: maximum glyph width in pixels */
- /* */
- /* caret_slope_enumerator :: Rise of the caret slope, */
- /* typically set to 1 for non-italic fonts. */
- /* caret_slope_denominator :: Rise of the caret slope, */
- /* typically set to 0 for non-italic fonts. */
- /* caret_offset :: Offset in pixels */
- /* to move the caret for proper positioning. */
- /* */
- /* min_origin_SB :: Minimum of horiBearingX */
- /* (resp. vertBearingY) */
- /* min_advance_SB :: Minimum of */
- /* (hori. advance - ( horiBearingX + width )) */
- /* (resp. vert. advance - ( vertBearingY + height )) */
- /* max_before_BL :: Maximum of horiBearingY */
- /* (resp. Maximum of vertBearingY) */
- /* min_after_BL :: Minimum of ( horiBearingY - height ) */
- /* (resp. vertBearingX - width ) */
- /* */
- 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, as defined 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;
-
-
- /*************************************************************/
- /* */
- /* <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> */
- /* Initializes the embedded bitmap extension for the */
- /* FreeType engine. */
- /* */
- /* <Input> */
- /* engine :: handle to current FreeType library instance */
- /* */
- /* <Return> */
- /* Error code. 0 means success. */
- /* */
- FT_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 if the */
- /* font contains no embedded bitmaps. All fields in */
- /* `eblc_table' will then be set to 0. */
- /* */
- FT_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. */
- /* */
- FT_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 */
- /* */
- FT_EXPORT_DEF( void )
- TT_Done_SBit_Image( TT_SBit_Image* image );
-
-
- /*************************************************************/
- /* */
- /* <Function> TT_Get_SBit_Strike */
- /* */
- /* <Description> */
- /* Loads a suitable strike (bitmap sizetable) for the */
- /* given instance. This strike includes */
- /* sbitLineMetrics. */
- /* */
- /* <Input> */
- /* face :: the source face */
- /* instance :: the current size instance */
- /* */
- /* <Output> */
- /* strike :: the bitmap strike descriptor */
- /* */
- /* <Return> */
- /* Error code. 0 means success. */
- /* */
- FT_EXPORT_DEF( TT_Error )
- TT_Get_SBit_Strike( TT_Face face,
- TT_Instance instance,
- TT_SBit_Strike* strike );
-
-
- /*************************************************************/
- /* */
- /* <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. */
- /* */
- FT_EXPORT_DEF( TT_Error )
- TT_Load_Glyph_Bitmap( TT_Face face,
- TT_Instance instance,
- TT_UShort glyph_index,
- TT_SBit_Image* bitmap );
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* FTXSBIT_H */
-
-
-/* END */