ThaiLayoutEngine.cpp [plain text]
#include "LETypes.h"
#include "LayoutEngine.h"
#include "ThaiLayoutEngine.h"
#include "ScriptAndLanguageTags.h"
#include "ThaiShaping.h"
U_NAMESPACE_BEGIN
const char ThaiLayoutEngine::fgClassID=0;
ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
: LayoutEngine(fontInstance, scriptCode, languageCode)
{
fErrorChar = 0x25CC;
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 , LEGlyphID *&glyphs, le_int32 *&charIndices, 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;
}
charIndices = LE_NEW_ARRAY(le_int32, count * 2);
if (charIndices == NULL) {
LE_DELETE_ARRAY(outChars);
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, charIndices);
mapCharsToGlyphs(outChars, 0, glyphCount, false, false, glyphs, charIndices, success);
LE_DELETE_ARRAY(outChars);
return glyphCount;
}
U_NAMESPACE_END