124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
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/*
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*
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* (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "LayoutEngine.h"
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#include "ThaiLayoutEngine.h"
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#include "ScriptAndLanguageTags.h"
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#include "LEGlyphStorage.h"
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#include "KernTable.h"
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#include "ThaiShaping.h"
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ThaiLayoutEngine)
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ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags)
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: LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)
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{
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fErrorChar = 0x25CC;
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// Figure out which presentation forms the font uses
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if (! fontInstance->canDisplay(0x0E01)) {
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// No Thai in font; don't use presentation forms.
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fGlyphSet = 3;
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} else if (fontInstance->canDisplay(0x0E64)) {
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// WorldType uses reserved space in Thai block
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fGlyphSet = 0;
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} else if (fontInstance->canDisplay(0xF701)) {
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// Microsoft corporate zone
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fGlyphSet = 1;
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if (!fontInstance->canDisplay(fErrorChar)) {
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fErrorChar = 0xF71B;
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}
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} else if (fontInstance->canDisplay(0xF885)) {
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// Apple corporate zone
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fGlyphSet = 2;
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} else {
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// no presentation forms in the font
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fGlyphSet = 3;
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}
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}
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ThaiLayoutEngine::~ThaiLayoutEngine()
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{
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// nothing to do
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}
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// Input: characters (0..max provided for context)
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// Output: glyphs, char indices
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// Returns: the glyph count
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// NOTE: this assumes that ThaiShaping::compose will allocate the outChars array...
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le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
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{
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if (LE_FAILURE(success)) {
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return 0;
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}
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if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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LEUnicode *outChars;
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le_int32 glyphCount;
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// This is enough room for the worst-case expansion
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// (it says here...)
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outChars = LE_NEW_ARRAY(LEUnicode, count * 2);
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if (outChars == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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glyphStorage.allocateGlyphArray(count * 2, FALSE, success);
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if (LE_FAILURE(success)) {
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LE_DELETE_ARRAY(outChars);
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success = LE_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, glyphStorage);
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mapCharsToGlyphs(outChars, 0, glyphCount, FALSE, FALSE, glyphStorage, success);
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LE_DELETE_ARRAY(outChars);
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glyphStorage.adoptGlyphCount(glyphCount);
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return glyphCount;
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}
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// This is the same as LayoutEngline::adjustGlyphPositions() except that it doesn't call adjustMarkGlyphs
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void ThaiLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool /*reverse*/,
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LEGlyphStorage &glyphStorage, LEErrorCode &success)
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{
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if (LE_FAILURE(success)) {
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return;
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}
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if (chars == NULL || offset < 0 || count < 0) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (fTypoFlags & 0x1) { /* kerning enabled */
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static const le_uint32 kernTableTag = LE_KERN_TABLE_TAG;
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KernTable kt(fFontInstance, getFontTable(kernTableTag));
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kt.process(glyphStorage);
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}
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// default is no adjustments
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return;
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}
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U_NAMESPACE_END
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