89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
|
|
/*
|
|
* @(#)ThaiLayoutEngine.cpp 1.2 00/03/15
|
|
*
|
|
* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
|
|
*
|
|
*/
|
|
|
|
#include "LETypes.h"
|
|
#include "LayoutEngine.h"
|
|
#include "ThaiLayoutEngine.h"
|
|
#include "ScriptAndLanguageTags.h"
|
|
|
|
#include "ThaiShaping.h"
|
|
|
|
ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
|
|
: LayoutEngine(fontInstance, scriptCode, languageCode)
|
|
{
|
|
fErrorChar = 0x25CC;
|
|
|
|
// Figure out which presentation forms the font uses
|
|
if (fontInstance->canDisplay(0x0E64)) {
|
|
// WorldType uses reserved space in Thai block
|
|
fGlyphSet = 0;
|
|
} else if (fontInstance->canDisplay(0xF701)) {
|
|
// Microsoft corporate zone
|
|
fGlyphSet = 1;
|
|
|
|
if (!fontInstance->canDisplay(fErrorChar)) {
|
|
fErrorChar = 0xF71B;
|
|
}
|
|
} else if (fontInstance->canDisplay(0xF885)) {
|
|
// Apple corporate zone
|
|
fGlyphSet = 2;
|
|
} else {
|
|
// no presentation forms in the font
|
|
fGlyphSet = 3;
|
|
}
|
|
}
|
|
|
|
ThaiLayoutEngine::~ThaiLayoutEngine()
|
|
{
|
|
// nothing to do
|
|
}
|
|
|
|
// Input: characters (0..max provided for context)
|
|
// Output: glyphs, char indices
|
|
// Returns: the glyph count
|
|
// NOTE: this assumes that ThaiShaping::compose will allocate the outChars array...
|
|
le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, 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;
|
|
|
|
// This is enough room for the worst-case expansion
|
|
// (it says here...)
|
|
outChars = new LEUnicode[count * 2];
|
|
|
|
if (outChars == NULL) {
|
|
success = LE_MEMORY_ALLOCATION_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
charIndices = new le_int32[count * 2];
|
|
|
|
if (charIndices == NULL) {
|
|
delete[] 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);
|
|
|
|
delete[] outChars;
|
|
|
|
return glyphCount;
|
|
}
|
|
|