ft2-ot_validation.html
来自「嵌入式freetype库的应用文档包含freetype的简要说明和应用examp」· HTML 代码 · 共 143 行
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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>OpenType Validation</h1></center><h2>Synopsis</h2><table align=center cellspacing=5 cellpadding=0 border=0><tr><td></td><td><a href="#FT_VALIDATE_XXX">FT_VALIDATE_XXX</a></td><td></td><td><a href="#FT_OpenType_Validate">FT_OpenType_Validate</a></td><td></td><td></td></tr></table><br><br><table align=center width="87%"><tr><td><p>This section contains the declaration of functions to validate some OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF).</p></td></tr></table><br><table align=center width="75%"><tr><td><h4><a name="FT_VALIDATE_XXX">FT_VALIDATE_XXX</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>#define <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_BASE</a> 0x0100#define <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_GDEF</a> 0x0200#define <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_GPOS</a> 0x0400#define <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_GSUB</a> 0x0800#define <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_JSTF</a> 0x1000#define <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_OT</a> <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_BASE</a> | \ <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_GDEF</a> | \ <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_GPOS</a> | \ <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_GSUB</a> | \ <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_JSTF</a></pre></table><br><table align=center width="87%"><tr><td><p>A list of bit-field constants used with <a href="ft2-ot_validation.html#FT_OpenType_Validate">FT_OpenType_Validate</a> to indicate which OpenType tables should be validated.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>values</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>FT_VALIDATE_BASE</b></td><td><p>Validate BASE table.</p></td></tr><tr valign=top><td><b>FT_VALIDATE_GDEF</b></td><td><p>Validate GDEF table.</p></td></tr><tr valign=top><td><b>FT_VALIDATE_GPOS</b></td><td><p>Validate GPOS table.</p></td></tr><tr valign=top><td><b>FT_VALIDATE_GSUB</b></td><td><p>Validate GSUB table.</p></td></tr><tr valign=top><td><b>FT_VALIDATE_JSTF</b></td><td><p>Validate JSTF table.</p></td></tr><tr valign=top><td><b>FT_VALIDATE_OT</b></td><td><p>Validate all OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF).</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_OpenType_Validate">FT_OpenType_Validate</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> ) <b>FT_OpenType_Validate</b>( <a href="ft2-base_interface.html#FT_Face">FT_Face</a> face, <a href="ft2-basic_types.html#FT_UInt">FT_UInt</a> validation_flags, <a href="ft2-basic_types.html#FT_Bytes">FT_Bytes</a> *BASE_table, <a href="ft2-basic_types.html#FT_Bytes">FT_Bytes</a> *GDEF_table, <a href="ft2-basic_types.html#FT_Bytes">FT_Bytes</a> *GPOS_table, <a href="ft2-basic_types.html#FT_Bytes">FT_Bytes</a> *GSUB_table, <a href="ft2-basic_types.html#FT_Bytes">FT_Bytes</a> *JSTF_table );</pre></table><br><table align=center width="87%"><tr><td><p>Validate various OpenType tables to assure that all offsets and indices are valid. The idea is that a higher-level library which actually does the text layout can access those tables without error checking (which can be quite time consuming).</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>face</b></td><td><p>A handle to the input face.</p></td></tr><tr valign=top><td><b>validation_flags</b></td><td><p>A bit field which specifies the tables to be validated. See <a href="ft2-ot_validation.html#FT_VALIDATE_XXX">FT_VALIDATE_XXX</a> for possible values.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>output</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>BASE_table</b></td><td><p>A pointer to the BASE table.</p></td></tr><tr valign=top><td><b>GDEF_table</b></td><td><p>A pointer to the GDEF table.</p></td></tr><tr valign=top><td><b>GPOS_table</b></td><td><p>A pointer to the GPOS table.</p></td></tr><tr valign=top><td><b>GSUB_table</b></td><td><p>A pointer to the GSUB table.</p></td></tr><tr valign=top><td><b>JSTF_table</b></td><td><p>A pointer to the JSTF table.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>This function only works with OpenType fonts, returning an error otherwise.</p><p>After use, the application should deallocate the five tables with `free'. A NULL value indicates that the table either doesn't exist in the font, or the application hasn't asked for validation.</p></td></tr></table></td></tr></table><hr width="75%"></body></html>⌨️ 快捷键说明
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