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/*
*
* (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "LEScripts.h"
#include "LEGlyphFilter.h"
#include "LEGlyphStorage.h"
#include "LayoutEngine.h"
#include "OpenTypeLayoutEngine.h"
#include "ArabicLayoutEngine.h"
#include "ScriptAndLanguageTags.h"
#include "CharSubstitutionFilter.h"
#include "GlyphSubstitutionTables.h"
#include "GlyphDefinitionTables.h"
#include "GlyphPositioningTables.h"
#include "GDEFMarkFilter.h"
#include "ArabicShaping.h"
#include "CanonShaping.h"
U_NAMESPACE_BEGIN
le_bool CharSubstitutionFilter::accept(LEGlyphID glyph) const
{
return fFontInstance->canDisplay((LEUnicode) glyph);
}
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ArabicOpenTypeLayoutEngine)
ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable, LEErrorCode &success)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success)
{
fFeatureMap = ArabicShaping::getFeatureMap(fFeatureMapCount);
fFeatureOrder = TRUE;
}
ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
le_int32 typoFlags, LEErrorCode &success)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
{
fFeatureMap = ArabicShaping::getFeatureMap(fFeatureMapCount);
// NOTE: We don't need to set fFeatureOrder to TRUE here
// because this constructor is only called by the constructor
// for UnicodeArabicOpenTypeLayoutEngine, which uses a pre-built
// GSUB table that has the features in the correct order.
//fFeatureOrder = TRUE;
}
ArabicOpenTypeLayoutEngine::~ArabicOpenTypeLayoutEngine()
{
// nothing to do
}
// Input: characters
// Output: characters, char indices, tags
// Returns: output character count
le_int32 ArabicOpenTypeLayoutEngine::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 (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
success = LE_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
outChars = LE_NEW_ARRAY(LEUnicode, count);
if (outChars == NULL) {
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
glyphStorage.allocateGlyphArray(count, rightToLeft, success);
glyphStorage.allocateAuxData(success);
if (LE_FAILURE(success)) {
LE_DELETE_ARRAY(outChars);
return 0;
}
CanonShaping::reorderMarks(&chars[offset], count, rightToLeft, outChars, glyphStorage);
// Note: This processes the *original* character array so we can get context
// for the first and last characters. This is OK because only the marks
// will have been reordered, and they don't contribute to shaping.
ArabicShaping::shape(chars, offset, count, max, rightToLeft, glyphStorage);
return count;
}
void ArabicOpenTypeLayoutEngine::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;
}
if (fGPOSTable != NULL) {
OpenTypeLayoutEngine::adjustGlyphPositions(chars, offset, count, reverse, glyphStorage, success);
} else if (fGDEFTable != NULL) {
GDEFMarkFilter filter(fGDEFTable);
adjustMarkGlyphs(glyphStorage, &filter, success);
} else {
GlyphDefinitionTableHeader *gdefTable = (GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable;
GDEFMarkFilter filter(gdefTable);
adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success);
}
}
UnicodeArabicOpenTypeLayoutEngine::UnicodeArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
: ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
{
fGSUBTable = (const GlyphSubstitutionTableHeader *) CanonShaping::glyphSubstitutionTable;
fGDEFTable = (const GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable;
fSubstitutionFilter = new CharSubstitutionFilter(fontInstance);
}
UnicodeArabicOpenTypeLayoutEngine::~UnicodeArabicOpenTypeLayoutEngine()
{
delete fSubstitutionFilter;
}
// "glyphs", "indices" -> glyphs, indices
le_int32 UnicodeArabicOpenTypeLayoutEngine::glyphPostProcessing(LEGlyphStorage &tempGlyphStorage, LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
if (LE_FAILURE(success)) {
return 0;
}
// FIXME: we could avoid the memory allocation and copy if we
// made a clone of mapCharsToGlyphs which took the fake glyphs
// directly.
le_int32 tempGlyphCount = tempGlyphStorage.getGlyphCount();
LEUnicode *tempChars = LE_NEW_ARRAY(LEUnicode, tempGlyphCount);
if (tempChars == NULL) {
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
for (le_int32 i = 0; i < tempGlyphCount; i += 1) {
tempChars[i] = (LEUnicode) LE_GET_GLYPH(tempGlyphStorage[i]);
}
glyphStorage.adoptCharIndicesArray(tempGlyphStorage);
ArabicOpenTypeLayoutEngine::mapCharsToGlyphs(tempChars, 0, tempGlyphCount, FALSE, TRUE, glyphStorage, success);
LE_DELETE_ARRAY(tempChars);
return tempGlyphCount;
}
void UnicodeArabicOpenTypeLayoutEngine::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool /*mirror*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
if (LE_FAILURE(success)) {
return;
}
if (chars == NULL || offset < 0 || count < 0) {
success = LE_ILLEGAL_ARGUMENT_ERROR;
return;
}
le_int32 i, dir = 1, out = 0;
if (reverse) {
out = count - 1;
dir = -1;
}
glyphStorage.allocateGlyphArray(count, reverse, success);
for (i = 0; i < count; i += 1, out += dir) {
glyphStorage[out] = (LEGlyphID) chars[offset + i];
}
}
void UnicodeArabicOpenTypeLayoutEngine::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;
}
GDEFMarkFilter filter(fGDEFTable);
adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success);
}
U_NAMESPACE_END
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