| |
| /* |
| * |
| * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved |
| * |
| */ |
| |
| #include "LETypes.h" |
| #include "LEScripts.h" |
| #include "LELanguages.h" |
| |
| #include "LayoutEngine.h" |
| #include "OpenTypeLayoutEngine.h" |
| #include "ScriptAndLanguageTags.h" |
| |
| #include "GlyphSubstitutionTables.h" |
| #include "GlyphDefinitionTables.h" |
| #include "GlyphPositioningTables.h" |
| |
| #include "LEGlyphStorage.h" |
| |
| #include "GDEFMarkFilter.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| UOBJECT_DEFINE_RTTI_IMPLEMENTATION(OpenTypeLayoutEngine) |
| |
| static const LETag emptyTag = 0x00000000; |
| |
| static const LETag ccmpFeatureTag = LE_CCMP_FEATURE_TAG; |
| static const LETag ligaFeatureTag = LE_LIGA_FEATURE_TAG; |
| static const LETag cligFeatureTag = LE_CLIG_FEATURE_TAG; |
| static const LETag kernFeatureTag = LE_KERN_FEATURE_TAG; |
| static const LETag markFeatureTag = LE_MARK_FEATURE_TAG; |
| static const LETag mkmkFeatureTag = LE_MKMK_FEATURE_TAG; |
| |
| static const LETag defaultFeatures[] = {ccmpFeatureTag, ligaFeatureTag, cligFeatureTag, kernFeatureTag, markFeatureTag, mkmkFeatureTag, emptyTag}; |
| |
| |
| OpenTypeLayoutEngine::OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, |
| const GlyphSubstitutionTableHeader *gsubTable) |
| : LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureList(defaultFeatures), fFeatureOrder(NULL), |
| fGSUBTable(gsubTable), fGDEFTable(NULL), fGPOSTable(NULL), fSubstitutionFilter(NULL) |
| { |
| static const le_uint32 gdefTableTag = LE_GDEF_TABLE_TAG; |
| static const le_uint32 gposTableTag = LE_GPOS_TABLE_TAG; |
| const GlyphPositioningTableHeader *gposTable = (const GlyphPositioningTableHeader *) getFontTable(gposTableTag); |
| |
| setScriptAndLanguageTags(); |
| |
| fGDEFTable = (const GlyphDefinitionTableHeader *) getFontTable(gdefTableTag); |
| |
| if (gposTable != NULL && gposTable->coversScriptAndLanguage(fScriptTag, fLangSysTag)) { |
| fGPOSTable = gposTable; |
| } |
| } |
| |
| void OpenTypeLayoutEngine::reset() |
| { |
| // NOTE: if we're called from |
| // the destructor, LayoutEngine;:reset() |
| // will have been called already by |
| // LayoutEngine::~LayoutEngine() |
| LayoutEngine::reset(); |
| } |
| |
| OpenTypeLayoutEngine::OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode) |
| : LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureOrder(NULL), |
| fGSUBTable(NULL), fGDEFTable(NULL), fGPOSTable(NULL), fSubstitutionFilter(NULL) |
| { |
| setScriptAndLanguageTags(); |
| } |
| |
| OpenTypeLayoutEngine::~OpenTypeLayoutEngine() |
| { |
| reset(); |
| } |
| |
| LETag OpenTypeLayoutEngine::getScriptTag(le_int32 scriptCode) |
| { |
| if (scriptCode < 0 || scriptCode >= scriptCodeCount) { |
| return 0xFFFFFFFF; |
| } |
| |
| return scriptTags[scriptCode]; |
| } |
| |
| LETag OpenTypeLayoutEngine::getLangSysTag(le_int32 languageCode) |
| { |
| if (languageCode < 0 || languageCode >= languageCodeCount) { |
| return 0xFFFFFFFF; |
| } |
| |
| return languageTags[languageCode]; |
| } |
| |
| void OpenTypeLayoutEngine::setScriptAndLanguageTags() |
| { |
| fScriptTag = getScriptTag(fScriptCode); |
| fLangSysTag = getLangSysTag(fLanguageCode); |
| } |
| |
| le_int32 OpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, |
| LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success) |
| { |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| if (offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) { |
| success = LE_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| le_int32 outCharCount = LayoutEngine::characterProcessing(chars, offset, count, max, rightToLeft, outChars, glyphStorage, success); |
| |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| glyphStorage.allocateGlyphArray(outCharCount, rightToLeft, success); |
| glyphStorage.allocateAuxData(success); |
| |
| for (le_int32 i = 0; i < outCharCount; i += 1) { |
| glyphStorage.setAuxData(i, (void *) fFeatureList, success); |
| } |
| |
| return outCharCount; |
| } |
| |
| // 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, |
| LEGlyphStorage &glyphStorage, LEErrorCode &success) |
| { |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) { |
| success = LE_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphStorage, success); |
| |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| if (fGSUBTable != NULL) { |
| count = fGSUBTable->process(glyphStorage, rightToLeft, fScriptTag, fLangSysTag, fGDEFTable, fSubstitutionFilter, fFeatureOrder); |
| } |
| |
| return count; |
| } |
| |
| le_int32 OpenTypeLayoutEngine::glyphPostProcessing(LEGlyphStorage &tempGlyphStorage, LEGlyphStorage &glyphStorage, LEErrorCode &success) |
| { |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| glyphStorage.adoptGlyphArray(tempGlyphStorage); |
| glyphStorage.adoptCharIndicesArray(tempGlyphStorage); |
| glyphStorage.adoptAuxDataArray(tempGlyphStorage); |
| glyphStorage.adoptGlyphCount(tempGlyphStorage); |
| |
| return glyphStorage.getGlyphCount(); |
| } |
| |
| le_int32 OpenTypeLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphStorage &glyphStorage, LEErrorCode &success) |
| { |
| LEUnicode *outChars = NULL; |
| LEGlyphStorage fakeGlyphStorage; |
| le_int32 outCharCount, outGlyphCount, fakeGlyphCount; |
| |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) { |
| success = LE_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| outCharCount = characterProcessing(chars, offset, count, max, rightToLeft, outChars, fakeGlyphStorage, success); |
| |
| if (outChars != NULL) { |
| fakeGlyphCount = glyphProcessing(outChars, 0, outCharCount, outCharCount, rightToLeft, fakeGlyphStorage, success); |
| LE_DELETE_ARRAY(outChars); // FIXME: a subclass may have allocated this, in which case this delete might not work... |
| //adjustGlyphs(outChars, 0, outCharCount, rightToLeft, fakeGlyphs, fakeGlyphCount); |
| } else { |
| fakeGlyphCount = glyphProcessing(chars, offset, count, max, rightToLeft, fakeGlyphStorage, success); |
| //adjustGlyphs(chars, offset, count, rightToLeft, fakeGlyphs, fakeGlyphCount); |
| } |
| |
| outGlyphCount = glyphPostProcessing(fakeGlyphStorage, glyphStorage, success); |
| |
| return outGlyphCount; |
| } |
| |
| // apply GPOS table, if any |
| void OpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, |
| LEGlyphStorage &glyphStorage, LEErrorCode &success) |
| { |
| if (LE_FAILURE(success)) { |
| return; |
| } |
| |
| if (chars == NULL || offset < 0 || count < 0) { |
| success = LE_ILLEGAL_ARGUMENT_ERROR; |
| return; |
| } |
| |
| le_int32 glyphCount = glyphStorage.getGlyphCount(); |
| |
| if (glyphCount > 0 && fGPOSTable != NULL) { |
| GlyphPositionAdjustment *adjustments = new GlyphPositionAdjustment[glyphCount]; |
| le_int32 i; |
| |
| if (adjustments == NULL) { |
| success = LE_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| |
| #if 0 |
| // Don't need to do this if we allocate |
| // the adjustments array w/ new... |
| for (i = 0; i < glyphCount; i += 1) { |
| adjustments[i].setXPlacement(0); |
| adjustments[i].setYPlacement(0); |
| |
| adjustments[i].setXAdvance(0); |
| adjustments[i].setYAdvance(0); |
| |
| adjustments[i].setBaseOffset(-1); |
| } |
| #endif |
| |
| fGPOSTable->process(glyphStorage, adjustments, reverse, fScriptTag, fLangSysTag, fGDEFTable, fFontInstance, fFeatureOrder); |
| |
| float xAdjust = 0, yAdjust = 0; |
| |
| for (i = 0; i < glyphCount; i += 1) { |
| float xAdvance = adjustments[i].getXAdvance(); |
| float yAdvance = adjustments[i].getYAdvance(); |
| float xPlacement = 0; |
| float yPlacement = 0; |
| |
| |
| #if 0 |
| // This is where separate kerning adjustments |
| // should get applied. |
| xAdjust += xKerning; |
| yAdjust += yKerning; |
| #endif |
| |
| for (le_int32 base = i; base >= 0; base = adjustments[base].getBaseOffset()) { |
| xPlacement += adjustments[base].getXPlacement(); |
| yPlacement += adjustments[base].getYPlacement(); |
| } |
| |
| xPlacement = fFontInstance->xUnitsToPoints(xPlacement); |
| yPlacement = fFontInstance->yUnitsToPoints(yPlacement); |
| glyphStorage.adjustPosition(i, xAdjust + xPlacement, -(yAdjust + yPlacement), success); |
| |
| xAdjust += fFontInstance->xUnitsToPoints(xAdvance); |
| yAdjust += fFontInstance->yUnitsToPoints(yAdvance); |
| } |
| |
| glyphStorage.adjustPosition(glyphCount, xAdjust, -yAdjust, success); |
| |
| delete[] adjustments; |
| } |
| |
| #if 0 |
| // Don't know why this is here... |
| LE_DELETE_ARRAY(fFeatureTags); |
| fFeatureTags = NULL; |
| #endif |
| } |
| |
| U_NAMESPACE_END |