Commit ffd43a6fc86c32c6e0b406fd7bdcac0804ac2b11
2000-04-25T16:09:17
added a new include file to access TrueType tables directly (e.g. OS/2, Head, HMTX and Postscript)..
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diff --git a/include/tttables.h b/include/tttables.h
new file mode 100644
index 0000000..2aecc37
--- /dev/null
+++ b/include/tttables.h
@@ -0,0 +1,438 @@
+/***************************************************************************/
+/* */
+/* tttables.h */
+/* */
+/* Basic SFNT/TrueType tables definitions and interface */
+/* */
+/* */
+/* Copyright 1996-2000 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. */
+/* */
+/***************************************************************************/
+
+#ifndef TTTABLES_H
+#define TTTABLES_H
+
+#include <freetype.h>
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* TT_Header */
+ /* */
+ /* <Description> */
+ /* A structure used to model a TrueType font header table. All */
+ /* fields follow the TrueType specification. */
+ /* */
+ typedef struct TT_Header_
+ {
+ FT_Fixed Table_Version;
+ FT_Fixed Font_Revision;
+
+ FT_Long CheckSum_Adjust;
+ FT_Long Magic_Number;
+
+ FT_UShort Flags;
+ FT_UShort Units_Per_EM;
+
+ FT_Long Created [2];
+ FT_Long Modified[2];
+
+ FT_Short xMin;
+ FT_Short yMin;
+ FT_Short xMax;
+ FT_Short yMax;
+
+ FT_UShort Mac_Style;
+ FT_UShort Lowest_Rec_PPEM;
+
+ FT_Short Font_Direction;
+ FT_Short Index_To_Loc_Format;
+ FT_Short Glyph_Data_Format;
+
+ } TT_Header;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* TT_HoriHeader */
+ /* */
+ /* <Description> */
+ /* A structure used to model a TrueType horizontal header, the `hhea' */
+ /* table, as well as the corresponding horizontal metrics table, */
+ /* i.e., the `hmtx' table. */
+ /* */
+ /* <Fields> */
+ /* Version :: The table version. */
+ /* */
+ /* Ascender :: The font's ascender, i.e., the distance */
+ /* from the baseline to the top-most of all */
+ /* glyph points found in the font. */
+ /* */
+ /* This value is invalid in many fonts, as */
+ /* it is usually set by the font designer, */
+ /* and often reflects only a portion of the */
+ /* glyphs found in the font (maybe ASCII). */
+ /* */
+ /* You should use the `sTypoAscender' field */
+ /* of the OS/2 table instead if you want */
+ /* the correct one. */
+ /* */
+ /* Descender :: The font's descender, i.e., the distance */
+ /* from the baseline to the bottom-most of */
+ /* all glyph points found in the font. It */
+ /* is negative. */
+ /* */
+ /* This value is invalid in many fonts, as */
+ /* it is usually set by the font designer, */
+ /* and often reflects only a portion of the */
+ /* glyphs found in the font (maybe ASCII). */
+ /* */
+ /* You should use the `sTypoDescender' */
+ /* field of the OS/2 table instead if you */
+ /* want the correct one. */
+ /* */
+ /* Line_Gap :: The font's line gap, i.e., the distance */
+ /* to add to the ascender and descender to */
+ /* get the BTB, i.e., the */
+ /* baseline-to-baseline distance for the */
+ /* font. */
+ /* */
+ /* advance_Width_Max :: This field is the maximum of all advance */
+ /* widths found in the font. It can be */
+ /* used to compute the maximum width of an */
+ /* arbitrary string of text. */
+ /* */
+ /* min_Left_Side_Bearing :: The minimum left side bearing of all */
+ /* glyphs within the font. */
+ /* */
+ /* min_Right_Side_Bearing :: The minimum right side bearing of all */
+ /* glyphs within the font. */
+ /* */
+ /* xMax_Extent :: The maximum horizontal extent (i.e., the */
+ /* `width' of a glyph's bounding box) for */
+ /* all glyphs in the font. */
+ /* */
+ /* caret_Slope_Rise :: The rise coefficient of the cursor's */
+ /* slope of the cursor (slope=rise/run). */
+ /* */
+ /* caret_Slope_Run :: The run coefficient of the cursor's */
+ /* slope. */
+ /* */
+ /* Reserved :: 10 reserved bytes. */
+ /* */
+ /* metric_Data_Format :: Always 0. */
+ /* */
+ /* number_Of_HMetrics :: Number of HMetrics entries in the `hmtx' */
+ /* table -- this value can be smaller than */
+ /* the total number of glyphs in the font. */
+ /* */
+ /* long_metrics :: A pointer into the `hmtx' table. */
+ /* */
+ /* short_metrics :: A pointer into the `hmtx' table. */
+ /* */
+ /* <Note> */
+ /* IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should */
+ /* be identical except for the names of their fields which */
+ /* are different. */
+ /* */
+ /* This ensures that a single function in the `ttload' */
+ /* module is able to read both the horizontal and vertical */
+ /* headers. */
+ /* */
+ typedef struct TT_HoriHeader_
+ {
+ FT_Fixed Version;
+ FT_Short Ascender;
+ FT_Short Descender;
+ FT_Short Line_Gap;
+
+ FT_UShort advance_Width_Max; /* advance width maximum */
+
+ FT_Short min_Left_Side_Bearing; /* minimum left-sb */
+ FT_Short min_Right_Side_Bearing; /* minimum right-sb */
+ FT_Short xMax_Extent; /* xmax extents */
+ FT_Short caret_Slope_Rise;
+ FT_Short caret_Slope_Run;
+ FT_Short caret_Offset;
+
+ FT_Short Reserved[4];
+
+ FT_Short metric_Data_Format;
+ FT_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' table. */
+
+ void* long_metrics;
+ void* short_metrics;
+
+ } TT_HoriHeader;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* TT_VertHeader */
+ /* */
+ /* <Description> */
+ /* A structure used to model a TrueType vertical header, the `vhea' */
+ /* table, as well as the corresponding vertical metrics table, i.e., */
+ /* the `vmtx' table. */
+ /* */
+ /* <Fields> */
+ /* Version :: The table version. */
+ /* */
+ /* Ascender :: The font's ascender, i.e., the distance */
+ /* from the baseline to the top-most of */
+ /* all glyph points found in the font. */
+ /* */
+ /* This value is invalid in many fonts, as */
+ /* it is usually set by the font designer, */
+ /* and often reflects only a portion of */
+ /* the glyphs found in the font (maybe */
+ /* ASCII). */
+ /* */
+ /* You should use the `sTypoAscender' */
+ /* field of the OS/2 table instead if you */
+ /* want the correct one. */
+ /* */
+ /* Descender :: The font's descender, i.e., the */
+ /* distance from the baseline to the */
+ /* bottom-most of all glyph points found */
+ /* in the font. It is negative. */
+ /* */
+ /* This value is invalid in many fonts, as */
+ /* it is usually set by the font designer, */
+ /* and often reflects only a portion of */
+ /* the glyphs found in the font (maybe */
+ /* ASCII). */
+ /* */
+ /* You should use the `sTypoDescender' */
+ /* field of the OS/2 table instead if you */
+ /* want the correct one. */
+ /* */
+ /* Line_Gap :: The font's line gap, i.e., the distance */
+ /* to add to the ascender and descender to */
+ /* get the BTB, i.e., the */
+ /* baseline-to-baseline distance for the */
+ /* font. */
+ /* */
+ /* advance_Height_Max :: This field is the maximum of all */
+ /* advance heights found in the font. It */
+ /* can be used to compute the maximum */
+ /* height of an arbitrary string of text. */
+ /* */
+ /* min_Top_Side_Bearing :: The minimum top side bearing of all */
+ /* glyphs within the font. */
+ /* */
+ /* min_Bottom_Side_Bearing :: The minimum bottom side bearing of all */
+ /* glyphs within the font. */
+ /* */
+ /* yMax_Extent :: The maximum vertical extent (i.e., the */
+ /* `height' of a glyph's bounding box) for */
+ /* all glyphs in the font. */
+ /* */
+ /* caret_Slope_Rise :: The rise coefficient of the cursor's */
+ /* slope of the cursor (slope=rise/run). */
+ /* */
+ /* caret_Slope_Run :: The run coefficient of the cursor's */
+ /* slope. */
+ /* */
+ /* Reserved :: 10 reserved bytes. */
+ /* */
+ /* metric_Data_Format :: Always 0. */
+ /* */
+ /* number_Of_HMetrics :: Number of VMetrics entries in the */
+ /* `vmtx' table -- this value can be */
+ /* smaller than the total number of glyphs */
+ /* in the font. */
+ /* */
+ /* long_metrics :: A pointer into the `vmtx' table. */
+ /* */
+ /* short_metrics :: A pointer into the `vmtx' table. */
+ /* */
+ /* <Note> */
+ /* IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should */
+ /* be identical except for the names of their fields which */
+ /* are different. */
+ /* */
+ /* This ensures that a single function in the `ttload' */
+ /* module is able to read both the horizontal and vertical */
+ /* headers. */
+ /* */
+ typedef struct TT_VertHeader_
+ {
+ FT_Fixed Version;
+ FT_Short Ascender;
+ FT_Short Descender;
+ FT_Short Line_Gap;
+
+ FT_UShort advance_Height_Max; /* advance height maximum */
+
+ FT_Short min_Top_Side_Bearing; /* minimum left-sb or top-sb */
+ FT_Short min_Bottom_Side_Bearing; /* minimum right-sb or bottom-sb */
+ FT_Short yMax_Extent; /* xmax or ymax extents */
+ FT_Short caret_Slope_Rise;
+ FT_Short caret_Slope_Run;
+ FT_Short caret_Offset;
+
+ FT_Short Reserved[4];
+
+ FT_Short metric_Data_Format;
+ FT_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;
+
+ } TT_VertHeader;
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* TT_OS2 */
+ /* */
+ /* <Description> */
+ /* A structure used to model a TrueType OS/2 table. This is the long */
+ /* table version. All fields comply to the TrueType specification. */
+ /* */
+ /* Note that we now support old Mac fonts which do not include an */
+ /* OS/2 table. In this case, the `version' field is always set to */
+ /* 0xFFFF. */
+ /* */
+ typedef struct TT_OS2_
+ {
+ FT_UShort version; /* 0x0001 - more or 0xFFFF */
+ FT_Short xAvgCharWidth;
+ FT_UShort usWeightClass;
+ FT_UShort usWidthClass;
+ FT_Short fsType;
+ FT_Short ySubscriptXSize;
+ FT_Short ySubscriptYSize;
+ FT_Short ySubscriptXOffset;
+ FT_Short ySubscriptYOffset;
+ FT_Short ySuperscriptXSize;
+ FT_Short ySuperscriptYSize;
+ FT_Short ySuperscriptXOffset;
+ FT_Short ySuperscriptYOffset;
+ FT_Short yStrikeoutSize;
+ FT_Short yStrikeoutPosition;
+ FT_Short sFamilyClass;
+
+ FT_Byte panose[10];
+
+ FT_ULong ulUnicodeRange1; /* Bits 0-31 */
+ FT_ULong ulUnicodeRange2; /* Bits 32-63 */
+ FT_ULong ulUnicodeRange3; /* Bits 64-95 */
+ FT_ULong ulUnicodeRange4; /* Bits 96-127 */
+
+ FT_Char achVendID[4];
+
+ FT_UShort fsSelection;
+ FT_UShort usFirstCharIndex;
+ FT_UShort usLastCharIndex;
+ FT_Short sTypoAscender;
+ FT_Short sTypoDescender;
+ FT_Short sTypoLineGap;
+ FT_UShort usWinAscent;
+ FT_UShort usWinDescent;
+
+ /* only version 1 tables: */
+
+ FT_ULong ulCodePageRange1; /* Bits 0-31 */
+ FT_ULong ulCodePageRange2; /* Bits 32-63 */
+ FT_ULong ulCodePageRange3; /* Bits 64-95 */
+ FT_ULong ulCodePageRange4; /* Bits 96-127 */
+
+ } TT_OS2;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* TT_Postscript */
+ /* */
+ /* <Description> */
+ /* A structure used to model a TrueType Postscript table. All fields */
+ /* comply to the TrueType table. This structure does not reference */
+ /* the Postscript glyph names, which can be nevertheless accessed */
+ /* with the `ttpost' module. */
+ /* */
+ typedef struct TT_Postscript_
+ {
+ FT_Fixed FormatType;
+ FT_Fixed italicAngle;
+ FT_Short underlinePosition;
+ FT_Short underlineThickness;
+ FT_ULong isFixedPitch;
+ FT_ULong minMemType42;
+ FT_ULong maxMemType42;
+ FT_ULong minMemType1;
+ FT_ULong maxMemType1;
+
+ /* Glyph names follow in the file, but we don't */
+ /* load them by default. See the ttpost.c file. */
+
+ } TT_Postscript;
+
+
+ typedef enum
+ {
+ ft_sfnt_head = 0,
+ ft_sfnt_hhea = 1,
+ ft_sfnt_vhea = 2,
+ ft_sfnt_os2 = 3,
+ ft_sfnt_post = 4,
+
+ sfnt_max /* don't remove */
+
+ } FT_Sfnt_Tag;
+
+ /* internal use only */
+ typedef void* (*FT_Get_Sfnt_Table_Func)( FT_Face face, FT_Sfnt_Tag tag );
+
+ /***************************************************************************
+ *
+ * <Function>
+ * FT_Get_Sfnt_Table
+ *
+ * <Description>
+ * Returns a pointer to a given SFNT table within a face.
+ *
+ * <Input>
+ * face :: handle to source
+ * tag :: index if SFNT table
+ *
+ * <Return>
+ * type-less pointer to the table. This will be 0 in case of error, or
+ * when the corresponding table was not found *OR* loaded from the file.
+ *
+ * <Note>
+ * The table is owned by the face object, and disappears with it.
+ *
+ * This function is only useful to access Sfnt tables that are loaded
+ * by the sfnt/truetype/opentype drivers. See FT_Sfnt_tag for a list.
+ *
+ * You can load any table with a different function.. XXX
+ *
+ ***************************************************************************/
+
+ EXPORT_DEF
+ void* FT_Get_Sfnt_Table( FT_Face face,
+ FT_Sfnt_Tag tag );
+
+
+#endif /* TTTABLES_H */
+