| |
| /* |
| * %W% %W% |
| * |
| * (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - 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" |
| |
| U_NAMESPACE_BEGIN |
| |
| const char OpenTypeLayoutEngine::fgClassID=0; |
| |
| OpenTypeLayoutEngine::OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, |
| const GlyphSubstitutionTableHeader *gsubTable) |
| : LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureTags(NULL), fGSUBTable(gsubTable), |
| fSubstitutionFilter(NULL), fFeatureOrder(NULL) |
| { |
| static le_uint32 gdefTableTag = 0x47444546; // "GDEF" |
| static le_uint32 gposTableTag = 0x47504F53; // "GPOS" |
| |
| fGDEFTable = (const GlyphDefinitionTableHeader *) getFontTable(gdefTableTag); |
| fGPOSTable = (const 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) { |
| uprv_free(fFeatureTags); |
| fFeatureTags = NULL; |
| } |
| } |
| |
| OpenTypeLayoutEngine::OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode) |
| : LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureTags(NULL), fGSUBTable(NULL), fGDEFTable(NULL), fGPOSTable(NULL), |
| fSubstitutionFilter(NULL), fFeatureOrder(NULL) |
| { |
| setScriptAndLanguageTags(); |
| } |
| |
| OpenTypeLayoutEngine::~OpenTypeLayoutEngine() |
| { |
| reset(); |
| } |
| |
| LETag OpenTypeLayoutEngine::getScriptTag(le_int32 scriptCode) |
| { |
| if (scriptCode == -1) { |
| return 0xFFFFFFFF; |
| } |
| |
| return scriptTags[scriptCode]; |
| } |
| |
| LETag OpenTypeLayoutEngine::getLangSysTag(le_int32 languageCode) |
| { |
| // FIXME: do this for real some day (soon?) |
| return 0xFFFFFFFF; |
| } |
| |
| 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, LEErrorCode &success) |
| { |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| if (chars == NULL || offset < 0 || count < 0) { |
| success = LE_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphs, charIndices, success); |
| |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| if (fGSUBTable != NULL) { |
| fGSUBTable->process(glyphs, featureTags, count, rightToLeft, fScriptTag, fLangSysTag, fGDEFTable, fSubstitutionFilter, fFeatureOrder); |
| } |
| |
| 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, LEErrorCode &success) |
| { |
| LEUnicode *outChars = NULL; |
| LEGlyphID *fakeGlyphs = NULL; |
| le_int32 *tempCharIndices = NULL; |
| 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, tempCharIndices, fFeatureTags, success); |
| |
| if (outChars != NULL) { |
| fakeGlyphCount = glyphProcessing(outChars, 0, outCharCount, outCharCount, rightToLeft, fFeatureTags, fakeGlyphs, tempCharIndices, success); |
| //adjustGlyphs(outChars, 0, outCharCount, rightToLeft, fakeGlyphs, fakeGlyphCount); |
| } else { |
| fakeGlyphCount = glyphProcessing(chars, offset, count, max, rightToLeft, fFeatureTags, fakeGlyphs, tempCharIndices, success); |
| //adjustGlyphs(chars, offset, count, rightToLeft, fakeGlyphs, fakeGlyphCount); |
| } |
| |
| outGlyphCount = glyphPostProcessing(fakeGlyphs, tempCharIndices, fakeGlyphCount, glyphs, charIndices, success); |
| |
| if (outChars != chars) { |
| uprv_free(outChars); |
| } |
| |
| if (fakeGlyphs != glyphs) { |
| uprv_free(fakeGlyphs); |
| } |
| |
| if (tempCharIndices != charIndices) { |
| uprv_free(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[], LEErrorCode &success) |
| { |
| if (LE_FAILURE(success)) { |
| return; |
| } |
| |
| if (chars == NULL || glyphs == NULL || positions == NULL || offset < 0 || count < 0) { |
| success = LE_ILLEGAL_ARGUMENT_ERROR; |
| return; |
| } |
| |
| if (fGPOSTable != NULL) { |
| GlyphPositionAdjustment *adjustments = new GlyphPositionAdjustment[glyphCount]; |
| |
| if (adjustments == NULL) { |
| success = LE_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| |
| fGPOSTable->process(glyphs, adjustments, fFeatureTags, glyphCount, reverse, fScriptTag, fLangSysTag, fGDEFTable, fFontInstance, fFeatureOrder); |
| |
| float xAdjust = 0, yAdjust = 0; |
| le_int32 i; |
| |
| 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 |
| xAdjust += xKerning; |
| yAdjust += yKerning; |
| #endif |
| |
| for (le_int32 base = i; base >= 0; base = adjustments[base].getBaseOffset()) { |
| xPlacement += adjustments[base].getXPlacement(); |
| yPlacement += adjustments[base].getYPlacement(); |
| } |
| |
| positions[i*2] += xAdjust + fFontInstance->xUnitsToPoints(xPlacement); |
| positions[i*2+1] -= yAdjust + fFontInstance->yUnitsToPoints(yPlacement); |
| |
| xAdjust += fFontInstance->xUnitsToPoints(xAdvance); |
| yAdjust += fFontInstance->yUnitsToPoints(yAdvance); |
| } |
| |
| positions[glyphCount*2] += xAdjust; |
| positions[glyphCount*2+1] -= yAdjust; |
| |
| delete[] adjustments; |
| } |
| |
| uprv_free(fFeatureTags); |
| fFeatureTags = NULL; |
| } |
| |
| U_NAMESPACE_END |