/// <summary> /// /// </summary> /// <param name="Font">Font</param> /// <param name="ScriptTag">Script to search in</param> /// <param name="LangSysTag">LangGys to search for</param> /// <returns>TagInfoFlags, if script not present == None</returns> internal static TagInfoFlags FindLangSys( IOpenTypeFont Font, uint ScriptTag, uint LangSysTag ) { TagInfoFlags flags = TagInfoFlags.None; try { FontTable gsubTable = Font.GetFontTable(OpenTypeTags.GSUB); if (gsubTable.IsPresent) { GSUBHeader gsubHeader = new GSUBHeader(0); ScriptTable gsubScript = gsubHeader.GetScriptList(gsubTable).FindScript(gsubTable, ScriptTag); if (!gsubScript.IsNull && !gsubScript.FindLangSys(gsubTable, LangSysTag).IsNull) { flags |= TagInfoFlags.Substitution; } } } catch (FileFormatException) { return(TagInfoFlags.None); } try { FontTable gposTable = Font.GetFontTable(OpenTypeTags.GPOS); if (gposTable.IsPresent) { GPOSHeader gposHeader = new GPOSHeader(0); ScriptTable gposScript = gposHeader.GetScriptList(gposTable).FindScript(gposTable, ScriptTag); if (!gposScript.IsNull && !gposScript.FindLangSys(gposTable, LangSysTag).IsNull) { flags |= TagInfoFlags.Positioning; } } } catch (FileFormatException) { return(TagInfoFlags.None); } return(flags); }
/// <summary> /// Position glyphs according to features defined in the font. /// </summary> /// <param name="Font">In: Font access interface</param> /// <param name="workspace">In: Workspace for layout engine</param> /// <param name="ScriptTag">In: Script tag</param> /// <param name="LangSysTag">In: LangSys tag</param> /// <param name="Metrics">In: LayoutMetrics</param> /// <param name="FeatureSet">In: List of features to apply</param> /// <param name="featureCount">In: Actual number of features in <paramref name="FeatureSet"/></param> /// <param name="featureSetOffset">In: offset of input characters inside FeatureSet</param> /// <param name="CharCount">In: Characters count (i.e. <paramref name="Charmap"/>.Length);</param> /// <param name="Charmap">In: Char to glyph mapping</param> /// <param name="Glyphs">In/out: List of GlyphInfo structs</param> /// <param name="Advances">In/out: Glyphs adv.widths</param> /// <param name="Offsets">In/out: Glyph offsets</param> /// <returns>Substitution result</returns> internal static OpenTypeLayoutResult PositionGlyphs( IOpenTypeFont Font, OpenTypeLayoutWorkspace workspace, uint ScriptTag, uint LangSysTag, LayoutMetrics Metrics, Feature[] FeatureSet, int featureCount, int featureSetOffset, int CharCount, UshortList Charmap, GlyphInfoList Glyphs, int *Advances, LayoutOffset *Offsets ) { try { FontTable GposTable = Font.GetFontTable(OpenTypeTags.GPOS); if (!GposTable.IsPresent) { return(OpenTypeLayoutResult.ScriptNotFound); } GPOSHeader GposHeader = new GPOSHeader(0); ScriptList ScriptList = GposHeader.GetScriptList(GposTable); ScriptTable Script = ScriptList.FindScript(GposTable, ScriptTag); if (Script.IsNull) { return(OpenTypeLayoutResult.ScriptNotFound); } LangSysTable LangSys = Script.FindLangSys(GposTable, LangSysTag); if (LangSys.IsNull) { return(OpenTypeLayoutResult.LangSysNotFound); } FeatureList FeatureList = GposHeader.GetFeatureList(GposTable); LookupList LookupList = GposHeader.GetLookupList(GposTable); LayoutEngine.ApplyFeatures( Font, workspace, OpenTypeTags.GPOS, GposTable, Metrics, LangSys, FeatureList, LookupList, FeatureSet, featureCount, featureSetOffset, CharCount, Charmap, Glyphs, Advances, Offsets ); } catch (FileFormatException) { return(OpenTypeLayoutResult.BadFontTable); } return(OpenTypeLayoutResult.Success); }