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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>FreeType-2.1.10 API Reference</title><style type="text/css"> body { font-family: Verdana, Geneva, Arial, Helvetica, serif; color: #000000; background: #FFFFFF; } p { text-align: justify; } h1 { text-align: center; } li { text-align: justify; } a:link { color: #0000EF; } a:visited { color: #51188E; } a:hover { color: #FF0000; } span.keyword { font-family: monospace; text-align: left; white-space: pre; color: darkblue; } pre.colored { color: blue; } ul.empty { list-style-type: none; }</style></head><body><center><h1>FreeType-2.1.10 API Reference</h1></center><center><h1>TrueType Tables</h1></center><h2>Synopsis</h2><table align=center cellspacing=5 cellpadding=0 border=0><tr><td></td><td><a href="#TT_Header">TT_Header</a></td><td></td><td><a href="#FT_Sfnt_Tag">FT_Sfnt_Tag</a></td></tr><tr><td></td><td><a href="#TT_HoriHeader">TT_HoriHeader</a></td><td></td><td><a href="#FT_Get_Sfnt_Table">FT_Get_Sfnt_Table</a></td></tr><tr><td></td><td><a href="#TT_VertHeader">TT_VertHeader</a></td><td></td><td><a href="#FT_Load_Sfnt_Table">FT_Load_Sfnt_Table</a></td></tr><tr><td></td><td><a href="#TT_OS2">TT_OS2</a></td><td></td><td><a href="#FT_Sfnt_Table_Info">FT_Sfnt_Table_Info</a></td></tr><tr><td></td><td><a href="#TT_Postscript">TT_Postscript</a></td><td></td><td><a href="#FT_Get_CMap_Language_ID">FT_Get_CMap_Language_ID</a></td></tr><tr><td></td><td><a href="#TT_PCLT">TT_PCLT</a></td><td></td><td><a href="#FT_PARAM_TAG_UNPATENTED_HINTING">FT_PARAM_TAG_UNPATENTED_HINTING</a></td></tr><tr><td></td><td><a href="#TT_MaxProfile">TT_MaxProfile</a></td><td></td><td></td></tr></table><br><br><table align=center width="87%"><tr><td><p>This section contains the definition of TrueType-specific tables as well as some routines used to access and process them.</p></td></tr></table><br><table align=center width="75%"><tr><td><h4><a name="TT_Header">TT_Header</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> <span class="keyword">typedef</span> <span class="keyword">struct</span> TT_Header_ { <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> Table_Version; <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> Font_Revision; <a href="ft2-basic_types.html#FT_Long">FT_Long</a> CheckSum_Adjust; <a href="ft2-basic_types.html#FT_Long">FT_Long</a> Magic_Number; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> Flags; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> Units_Per_EM; <a href="ft2-basic_types.html#FT_Long">FT_Long</a> Created [2]; <a href="ft2-basic_types.html#FT_Long">FT_Long</a> Modified[2]; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> xMin; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> yMin; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> xMax; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> yMax; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> Mac_Style; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> Lowest_Rec_PPEM; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Font_Direction; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Index_To_Loc_Format; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Glyph_Data_Format; } <b>TT_Header</b>;</pre></table><br><table align=center width="87%"><tr><td><p>A structure used to model a TrueType font header table. All fields follow the TrueType specification.</p></td></tr></table><br></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="TT_HoriHeader">TT_HoriHeader</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> <span class="keyword">typedef</span> <span class="keyword">struct</span> TT_HoriHeader_ { <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> Version; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Ascender; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Descender; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Line_Gap; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> advance_Width_Max; /* advance width maximum */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> min_Left_Side_Bearing; /* minimum left-sb */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> min_Right_Side_Bearing; /* minimum right-sb */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> xMax_Extent; /* xmax extents */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> caret_Slope_Rise; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> caret_Slope_Run; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> caret_Offset; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Reserved[4]; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> metric_Data_Format; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> number_Of_HMetrics; /* The following fields are not defined by the TrueType specification */ /* but they are used to connect the metrics header to the relevant */ /* `HMTX' table. */ <span class="keyword">void</span>* <span class="keyword">long_metrics</span>; <span class="keyword">void</span>* <span class="keyword">short_metrics</span>; } <b>TT_HoriHeader</b>;</pre></table><br><table align=center width="87%"><tr><td><p>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.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>fields</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>Version</b></td><td><p>The table version.</p></td></tr><tr valign=top><td><b>Ascender</b></td><td><p>The font's ascender, i.e., the distance from the baseline to the top-most of all glyph points found in the font.</p><p>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).</p><p>You should use the `sTypoAscender' field of the OS/2 table instead if you want the correct one.</p></td></tr><tr valign=top><td><b>Descender</b></td><td><p>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.</p><p>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).</p><p>You should use the `sTypoDescender' field of the OS/2 table instead if you want the correct one.</p></td></tr><tr valign=top><td><b>Line_Gap</b></td><td><p>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.</p></td></tr><tr valign=top><td><b>advance_Width_Max</b></td><td><p>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.</p></td></tr><tr valign=top><td><b>min_Left_Side_Bearing</b></td><td><p>The minimum left side bearing of all glyphs within the font.</p></td></tr><tr valign=top><td><b>min_Right_Side_Bearing</b></td><td><p>The minimum right side bearing of all glyphs within the font.</p></td></tr><tr valign=top><td><b>xMax_Extent</b></td><td><p>The maximum horizontal extent (i.e., the `width' of a glyph's bounding box) for all glyphs in the font.</p></td></tr><tr valign=top><td><b>caret_Slope_Rise</b></td><td><p>The rise coefficient of the cursor's slope of the cursor (slope=rise/run).</p></td></tr><tr valign=top><td><b>caret_Slope_Run</b></td><td><p>The run coefficient of the cursor's slope.</p></td></tr><tr valign=top><td><b>Reserved</b></td><td><p>10 reserved bytes.</p></td></tr><tr valign=top><td><b>metric_Data_Format</b></td><td><p>Always 0.</p></td></tr><tr valign=top><td><b>number_Of_HMetrics</b></td><td><p>Number of HMetrics entries in the `hmtx' table -- this value can be smaller than the total number of glyphs in the font.</p></td></tr><tr valign=top><td><b>long_metrics</b></td><td><p>A pointer into the `hmtx' table.</p></td></tr><tr valign=top><td><b>short_metrics</b></td><td><p>A pointer into the `hmtx' table.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should be identical except for the names of their fields which are different.</p><p>This ensures that a single function in the `ttload' module is able to read both the horizontal and vertical headers.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="TT_VertHeader">TT_VertHeader</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> <span class="keyword">typedef</span> <span class="keyword">struct</span> TT_VertHeader_ { <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> Version; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Ascender; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Descender; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Line_Gap; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> advance_Height_Max; /* advance height maximum */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> min_Top_Side_Bearing; /* minimum left-sb or top-sb */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> min_Bottom_Side_Bearing; /* minimum right-sb or bottom-sb */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> yMax_Extent; /* xmax or ymax extents */ <a href="ft2-basic_types.html#FT_Short">FT_Short</a> caret_Slope_Rise; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> caret_Slope_Run; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> caret_Offset; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> Reserved[4]; <a href="ft2-basic_types.html#FT_Short">FT_Short</a> metric_Data_Format; <a href="ft2-basic_types.html#FT_UShort">FT_UShort</a> 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. */ <span class="keyword">void</span>* <span class="keyword">long_metrics</span>; <span class="keyword">void</span>* <span class="keyword">short_metrics</span>; } <b>TT_VertHeader</b>;</pre></table><br><table align=center width="87%"><tr><td><p>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.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>fields</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>Version</b></td><td><p>The table version.</p></td></tr>⌨️ 快捷键说明
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