ThaiLayoutEngine.cpp [plain text]
#include "LETypes.h"
#include "LayoutEngine.h"
#include "ThaiLayoutEngine.h"
#include "ScriptAndLanguageTags.h"
#include "LEGlyphStorage.h"
#include "KernTable.h"
#include "ThaiShaping.h"
U_NAMESPACE_BEGIN
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ThaiLayoutEngine)
ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
: LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
{
fErrorChar = 0x25CC;
if (! fontInstance->canDisplay(0x0E01)) {
fGlyphSet = 3;
} else if (fontInstance->canDisplay(0x0E64)) {
fGlyphSet = 0;
} else if (fontInstance->canDisplay(0xF701)) {
fGlyphSet = 1;
if (!fontInstance->canDisplay(fErrorChar)) {
fErrorChar = 0xF71B;
}
} else if (fontInstance->canDisplay(0xF885)) {
fGlyphSet = 2;
} else {
fGlyphSet = 3;
}
}
ThaiLayoutEngine::~ThaiLayoutEngine()
{
}
le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool , 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;
}
LEUnicode *outChars;
le_int32 glyphCount;
outChars = LE_NEW_ARRAY(LEUnicode, count * 2);
if (outChars == NULL) {
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
glyphStorage.allocateGlyphArray(count * 2, FALSE, success);
if (LE_FAILURE(success)) {
LE_DELETE_ARRAY(outChars);
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, glyphStorage);
mapCharsToGlyphs(outChars, 0, glyphCount, FALSE, FALSE, glyphStorage, success);
LE_DELETE_ARRAY(outChars);
glyphStorage.adoptGlyphCount(glyphCount);
return glyphCount;
}
void ThaiLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool ,
LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
if (LE_FAILURE(success)) {
return;
}
if (chars == NULL || offset < 0 || count < 0) {
success = LE_ILLEGAL_ARGUMENT_ERROR;
return;
}
if (fTypoFlags & LE_Kerning_FEATURE_FLAG) {
LETableReference kernTable(fFontInstance, LE_KERN_TABLE_TAG, success);
KernTable kt(kernTable, success);
kt.process(glyphStorage, success);
}
return;
}
U_NAMESPACE_END