sl@0: 
sl@0: /*
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "LEScripts.h"
sl@0: #include "LEGlyphFilter.h"
sl@0: #include "LEGlyphStorage.h"
sl@0: #include "LayoutEngine.h"
sl@0: #include "OpenTypeLayoutEngine.h"
sl@0: #include "ArabicLayoutEngine.h"
sl@0: #include "ScriptAndLanguageTags.h"
sl@0: #include "CharSubstitutionFilter.h"
sl@0: 
sl@0: #include "GlyphSubstitutionTables.h"
sl@0: #include "GlyphDefinitionTables.h"
sl@0: #include "GlyphPositioningTables.h"
sl@0: 
sl@0: #include "GDEFMarkFilter.h"
sl@0: 
sl@0: #include "ArabicShaping.h"
sl@0: #include "CanonShaping.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: le_bool CharSubstitutionFilter::accept(LEGlyphID glyph) const
sl@0: {
sl@0:     return fFontInstance->canDisplay((LEUnicode) glyph);
sl@0: }
sl@0: 
sl@0: UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ArabicOpenTypeLayoutEngine)
sl@0: 
sl@0: ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
sl@0:                         le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)
sl@0:     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)
sl@0: {
sl@0:     /**/ fFeatureOrder = ArabicShaping::getFeatureOrder();
sl@0: }
sl@0: 
sl@0: ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
sl@0: 						       le_int32 typoFlags)
sl@0:     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)
sl@0: {
sl@0:     // fFeatureOrder = ArabicShaping::getFeatureOrder();
sl@0: }
sl@0: 
sl@0: ArabicOpenTypeLayoutEngine::~ArabicOpenTypeLayoutEngine()
sl@0: {
sl@0:     // nothing to do
sl@0: }
sl@0: 
sl@0: // Input: characters
sl@0: // Output: characters, char indices, tags
sl@0: // Returns: output character count
sl@0: le_int32 ArabicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
sl@0:         LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
sl@0: {
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
sl@0:         success = LE_ILLEGAL_ARGUMENT_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     outChars = LE_NEW_ARRAY(LEUnicode, count);
sl@0: 
sl@0:     if (outChars == NULL) {
sl@0:         success = LE_MEMORY_ALLOCATION_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     glyphStorage.allocateGlyphArray(count, rightToLeft, success);
sl@0:     glyphStorage.allocateAuxData(success);
sl@0: 
sl@0:     if (LE_FAILURE(success)) {
sl@0:         LE_DELETE_ARRAY(outChars);
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     CanonShaping::reorderMarks(&chars[offset], count, rightToLeft, outChars, glyphStorage);
sl@0: 
sl@0:     // Note: This processes the *original* character array so we can get context
sl@0:     // for the first and last characters. This is OK because only the marks
sl@0:     // will have been reordered, and they don't contribute to shaping.
sl@0:     ArabicShaping::shape(chars, offset, count, max, rightToLeft, glyphStorage);
sl@0: 
sl@0:     return count;
sl@0: }
sl@0: 
sl@0: void ArabicOpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse,
sl@0:                                                       LEGlyphStorage &glyphStorage, LEErrorCode &success)
sl@0: {
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return;
sl@0:     }
sl@0: 
sl@0:     if (chars == NULL || offset < 0 || count < 0) {
sl@0:         success = LE_ILLEGAL_ARGUMENT_ERROR;
sl@0:         return;
sl@0:     }
sl@0: 
sl@0:     if (fGPOSTable != NULL) {
sl@0:         OpenTypeLayoutEngine::adjustGlyphPositions(chars, offset, count, reverse, glyphStorage, success);
sl@0:     } else if (fGDEFTable != NULL) {
sl@0:         GDEFMarkFilter filter(fGDEFTable);
sl@0: 
sl@0:         adjustMarkGlyphs(glyphStorage, &filter, success);
sl@0:     } else {
sl@0:         GlyphDefinitionTableHeader *gdefTable = (GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable;
sl@0:         GDEFMarkFilter filter(gdefTable);
sl@0: 
sl@0:         adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success);
sl@0:     }
sl@0: }
sl@0: 
sl@0: UnicodeArabicOpenTypeLayoutEngine::UnicodeArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags)
sl@0:     : ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)
sl@0: {
sl@0:     fGSUBTable = (const GlyphSubstitutionTableHeader *) CanonShaping::glyphSubstitutionTable;
sl@0:     fGDEFTable = (const GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable;
sl@0: 
sl@0:     fSubstitutionFilter = new CharSubstitutionFilter(fontInstance);
sl@0: }
sl@0: 
sl@0: UnicodeArabicOpenTypeLayoutEngine::~UnicodeArabicOpenTypeLayoutEngine()
sl@0: {
sl@0:     delete fSubstitutionFilter;
sl@0: }
sl@0: 
sl@0: // "glyphs", "indices" -> glyphs, indices
sl@0: le_int32 UnicodeArabicOpenTypeLayoutEngine::glyphPostProcessing(LEGlyphStorage &tempGlyphStorage, LEGlyphStorage &glyphStorage, LEErrorCode &success)
sl@0: {
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     // FIXME: we could avoid the memory allocation and copy if we
sl@0:     // made a clone of mapCharsToGlyphs which took the fake glyphs
sl@0:     // directly.
sl@0:     le_int32 tempGlyphCount = tempGlyphStorage.getGlyphCount();
sl@0:     LEUnicode *tempChars = LE_NEW_ARRAY(LEUnicode, tempGlyphCount);
sl@0: 
sl@0:     if (tempChars == NULL) {
sl@0:         success = LE_MEMORY_ALLOCATION_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     for (le_int32 i = 0; i < tempGlyphCount; i += 1) {
sl@0:         tempChars[i] = (LEUnicode) LE_GET_GLYPH(tempGlyphStorage[i]);
sl@0:     }
sl@0: 
sl@0:     glyphStorage.adoptCharIndicesArray(tempGlyphStorage);
sl@0: 
sl@0:     ArabicOpenTypeLayoutEngine::mapCharsToGlyphs(tempChars, 0, tempGlyphCount, FALSE, TRUE, glyphStorage, success);
sl@0: 
sl@0:     LE_DELETE_ARRAY(tempChars);
sl@0: 
sl@0:     return tempGlyphCount;
sl@0: }
sl@0: 
sl@0: void UnicodeArabicOpenTypeLayoutEngine::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool /*mirror*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
sl@0: {
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return;
sl@0:     }
sl@0: 
sl@0:     if (chars == NULL || offset < 0 || count < 0) {
sl@0:         success = LE_ILLEGAL_ARGUMENT_ERROR;
sl@0:         return;
sl@0:     }
sl@0: 
sl@0:     le_int32 i, dir = 1, out = 0;
sl@0: 
sl@0:     if (reverse) {
sl@0:         out = count - 1;
sl@0:         dir = -1;
sl@0:     }
sl@0: 
sl@0:     glyphStorage.allocateGlyphArray(count, reverse, success);
sl@0: 
sl@0:     for (i = 0; i < count; i += 1, out += dir) {
sl@0:         glyphStorage[out] = (LEGlyphID) chars[offset + i];
sl@0:     }
sl@0: }
sl@0: 
sl@0: void UnicodeArabicOpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse,
sl@0:                                                       LEGlyphStorage &glyphStorage, LEErrorCode &success)
sl@0: {
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return;
sl@0:     }
sl@0: 
sl@0:     if (chars == NULL || offset < 0 || count < 0) {
sl@0:         success = LE_ILLEGAL_ARGUMENT_ERROR;
sl@0:         return;
sl@0:     }
sl@0: 
sl@0:     GDEFMarkFilter filter(fGDEFTable);
sl@0: 
sl@0:     adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success);
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END
sl@0: