| |
| /* |
| * @(#)OpenTypeLayoutEngine.cpp 1.3 00/03/15 |
| * |
| * (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved |
| * |
| */ |
| |
| #include "LETypes.h" |
| #include "LayoutEngine.h" |
| #include "OpenTypeLayoutEngine.h" |
| #include "ScriptAndLanguageTags.h" |
| |
| #include "GlyphSubstitutionTables.h" |
| #include "GlyphDefinitionTables.h" |
| #include "GlyphPositioningTables.h" |
| |
| #include "GDEFMarkFilter.h" |
| |
| OpenTypeLayoutEngine::OpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, |
| GlyphSubstitutionTableHeader *gsubTable) |
| : LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureTags(NULL), fGSUBTable(gsubTable), fSubstitutionFilter(NULL) |
| { |
| static le_uint32 gdefTableTag = 0x47444546; // "GDEF" |
| static le_uint32 gposTableTag = 0x47504F53; // "GPOS" |
| |
| fGDEFTable = (GlyphDefinitionTableHeader *) getFontTable(gdefTableTag); |
| fGPOSTable = (GlyphPositioningTableHeader *) getFontTable(gposTableTag); |
| |
| setScriptAndLanguageTags(); |
| } |
| |
| void OpenTypeLayoutEngine::reset() |
| { |
| // NOTE: if we're called from |
| // the destructor, LayoutEngine;:reset() |
| // will have been called already by |
| // LayoutEngine::~LayoutEngine() |
| LayoutEngine::reset(); |
| |
| // The double call could be avoided by |
| // puting the following into a private |
| // method that's called from here and |
| // from our destructor |
| if (fFeatureTags != NULL) { |
| delete[] fFeatureTags; |
| fFeatureTags = NULL; |
| } |
| } |
| |
| OpenTypeLayoutEngine::OpenTypeLayoutEngine(LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode) |
| : LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureTags(NULL), fGSUBTable(NULL), fGDEFTable(NULL), fGPOSTable(NULL), |
| fSubstitutionFilter(NULL) |
| { |
| setScriptAndLanguageTags(); |
| } |
| |
| OpenTypeLayoutEngine::~OpenTypeLayoutEngine() |
| { |
| reset(); |
| } |
| |
| LETag scriptTags[] = { |
| neutScriptTag, // 'NEUT' |
| latnScriptTag, // 'latn' |
| grekScriptTag, // 'grek' |
| cyrlScriptTag, // 'cyrl' |
| armnScriptTag, // 'armn' **** Armenian: no MS definition **** |
| hebrScriptTag, // 'hebr' |
| arabScriptTag, // 'arab' |
| devaScriptTag, // 'deva' |
| bengScriptTag, // 'beng' |
| punjScriptTag, // 'punj' punjabi == gurmukhi |
| gujrScriptTag, // 'gujr' |
| oryaScriptTag, // 'orya' |
| tamlScriptTag, // 'taml' |
| teluScriptTag, // 'telu' |
| kndaScriptTag, // 'knda' |
| mlymScriptTag, // 'mlym' |
| thaiScriptTag, // 'thai' |
| laoScriptTag, // 'lao ' **** Lao: no MS definition **** |
| tibtScriptTag, // 'tibt' |
| grgnScriptTag, // 'grgn' **** Georgian: no MS definition **** |
| hangScriptTag, // 'hang' |
| kanaScriptTag, // 'kana' |
| bpmfScriptTag, // 'bpmf' **** Bopomofo: no MS definition **** |
| knbnScriptTag, // 'knbn' **** Kanbun: no MS definition **** |
| haniScriptTag, // 'hani' |
| surrScriptTag, // 'SURR' |
| puseScriptTag, // 'PUSE' |
| spclScriptTag // 'SPCL' |
| }; |
| |
| LETag OpenTypeLayoutEngine::getScriptTag(le_int32 scriptCode) |
| { |
| if (scriptCode == -1) { |
| return -1; |
| } |
| |
| return scriptTags[scriptCode]; |
| } |
| |
| LETag OpenTypeLayoutEngine::getLangSysTag(le_int32 languageCode) |
| { |
| // FIXME: do this for real some day (soon?) |
| return -1; |
| } |
| |
| void OpenTypeLayoutEngine::setScriptAndLanguageTags() |
| { |
| fScriptTag = getScriptTag(fScriptCode); |
| fLangSysTag = getLangSysTag(fLanguageCode); |
| } |
| |
| // Input: characters, tags |
| // Output: glyphs, char indices |
| le_int32 OpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, const LETag **featureTags, |
| LEGlyphID *&glyphs, le_int32 *&charIndices) |
| { |
| mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphs, charIndices); |
| |
| if (fGSUBTable != NULL) { |
| fGSUBTable->process(glyphs, featureTags, count, rightToLeft, fScriptTag, fLangSysTag, fGDEFTable, fSubstitutionFilter); |
| } |
| |
| return count; |
| } |
| |
| le_int32 OpenTypeLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphID *&glyphs, le_int32 *&charIndices) |
| { |
| LEUnicode *outChars = NULL; |
| LEGlyphID *fakeGlyphs = NULL; |
| le_int32 *tempCharIndices = NULL; |
| le_int32 outCharCount, outGlyphCount, fakeGlyphCount; |
| |
| outCharCount = characterProcessing(chars, offset, count, max, rightToLeft, outChars, tempCharIndices, fFeatureTags); |
| |
| if (outChars != NULL) { |
| fakeGlyphCount = glyphProcessing(outChars, 0, outCharCount, outCharCount, rightToLeft, fFeatureTags, fakeGlyphs, tempCharIndices); |
| //adjustGlyphs(outChars, 0, outCharCount, rightToLeft, fakeGlyphs, fakeGlyphCount); |
| } else { |
| fakeGlyphCount = glyphProcessing(chars, offset, count, max, rightToLeft, fFeatureTags, fakeGlyphs, tempCharIndices); |
| //adjustGlyphs(chars, offset, count, rightToLeft, fakeGlyphs, fakeGlyphCount); |
| } |
| |
| outGlyphCount = glyphPostProcessing(fakeGlyphs, tempCharIndices, fakeGlyphCount, glyphs, charIndices); |
| |
| if (outChars != chars) { |
| delete[] outChars; |
| } |
| |
| if (fakeGlyphs != glyphs) { |
| delete[] fakeGlyphs; |
| } |
| |
| if (tempCharIndices != charIndices) { |
| delete[] tempCharIndices; |
| } |
| |
| return outGlyphCount; |
| } |
| |
| // apply GPOS table, if any |
| void OpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, |
| LEGlyphID glyphs[], le_int32 glyphCount, float positions[]) |
| { |
| if (fGPOSTable != NULL) { |
| GlyphPositionAdjustment *adjustments = new GlyphPositionAdjustment[glyphCount]; |
| |
| fGPOSTable->process(glyphs, adjustments, fFeatureTags, glyphCount, reverse, fScriptTag, fLangSysTag, fGDEFTable, fFontInstance); |
| |
| float xAdjust = 0, yAdjust = 0; |
| le_int32 i; |
| |
| for (i = 0; i < glyphCount; i += 1) { |
| float xPlacement = fFontInstance->xUnitsToPoints(adjustments[i].getXPlacement()); |
| float xAdvance = fFontInstance->xUnitsToPoints(adjustments[i].getXAdvance()); |
| float yPlacement = fFontInstance->yUnitsToPoints(adjustments[i].getYPlacement()); |
| float yAdvance = fFontInstance->yUnitsToPoints(adjustments[i].getYAdvance()); |
| |
| xAdjust += xPlacement; |
| yAdjust += yPlacement; |
| |
| positions[i*2] += xAdjust; |
| positions[i*2+1] += yAdjust; |
| |
| xAdjust += xAdvance; |
| yAdjust += yAdvance; |
| } |
| |
| positions[glyphCount*2] += xAdjust; |
| positions[glyphCount*2+1] += yAdjust; |
| |
| delete[] adjustments; |
| } |
| |
| delete[] fFeatureTags; |
| fFeatureTags = NULL; |
| } |
| |