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/*
* %W% %W%
*
* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "LayoutEngine.h"
#include "OpenTypeLayoutEngine.h"
#include "ScriptAndLanguageTags.h"
#include "GlyphSubstitutionTables.h"
#include "GlyphDefinitionTables.h"
#include "GlyphPositioningTables.h"
#include "GDEFMarkFilter.h"
U_NAMESPACE_BEGIN
OpenTypeLayoutEngine::OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
const GlyphSubstitutionTableHeader *gsubTable)
: LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureTags(NULL), fGSUBTable(gsubTable),
fSubstitutionFilter(NULL), fFeatureOrder(NULL)
{
static le_uint32 gdefTableTag = 0x47444546; // "GDEF"
static le_uint32 gposTableTag = 0x47504F53; // "GPOS"
fGDEFTable = (const GlyphDefinitionTableHeader *) getFontTable(gdefTableTag);
fGPOSTable = (const GlyphPositioningTableHeader *) getFontTable(gposTableTag);
setScriptAndLanguageTags();
}
void OpenTypeLayoutEngine::reset()
{
// NOTE: if we're called from
// the destructor, LayoutEngine;:reset()
// will have been called already by
// LayoutEngine::~LayoutEngine()
LayoutEngine::reset();
// The double call could be avoided by
// puting the following into a private
// method that's called from here and
// from our destructor
if (fFeatureTags != NULL) {
delete[] fFeatureTags;
fFeatureTags = NULL;
}
}
OpenTypeLayoutEngine::OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
: LayoutEngine(fontInstance, scriptCode, languageCode), fFeatureTags(NULL), fGSUBTable(NULL), fGDEFTable(NULL), fGPOSTable(NULL),
fSubstitutionFilter(NULL), fFeatureOrder(NULL)
{
setScriptAndLanguageTags();
}
OpenTypeLayoutEngine::~OpenTypeLayoutEngine()
{
reset();
}
LETag OpenTypeLayoutEngine::getScriptTag(le_int32 scriptCode)
{
if (scriptCode == -1) {
return 0xFFFFFFFF;
}
return scriptTags[scriptCode];
}
LETag OpenTypeLayoutEngine::getLangSysTag(le_int32 languageCode)
{
// FIXME: do this for real some day (soon?)
return 0xFFFFFFFF;
}
void OpenTypeLayoutEngine::setScriptAndLanguageTags()
{
fScriptTag = getScriptTag(fScriptCode);
fLangSysTag = getLangSysTag(fLanguageCode);
}
// Input: characters, tags
// Output: glyphs, char indices
le_int32 OpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, const LETag **featureTags,
LEGlyphID *&glyphs, le_int32 *&charIndices, LEErrorCode &success)
{
if (LE_FAILURE(success)) {
return 0;
}
if (chars == NULL || offset < 0 || count < 0) {
success = LE_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphs, charIndices, success);
if (LE_FAILURE(success)) {
return 0;
}
if (fGSUBTable != NULL) {
fGSUBTable->process(glyphs, featureTags, count, rightToLeft, fScriptTag, fLangSysTag, fGDEFTable, fSubstitutionFilter, fFeatureOrder);
}
return count;
}
le_int32 OpenTypeLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphID *&glyphs, le_int32 *&charIndices, LEErrorCode &success)
{
LEUnicode *outChars = NULL;
LEGlyphID *fakeGlyphs = NULL;
le_int32 *tempCharIndices = NULL;
le_int32 outCharCount, outGlyphCount, fakeGlyphCount;
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;
}
outCharCount = characterProcessing(chars, offset, count, max, rightToLeft, outChars, tempCharIndices, fFeatureTags, success);
if (outChars != NULL) {
fakeGlyphCount = glyphProcessing(outChars, 0, outCharCount, outCharCount, rightToLeft, fFeatureTags, fakeGlyphs, tempCharIndices, success);
//adjustGlyphs(outChars, 0, outCharCount, rightToLeft, fakeGlyphs, fakeGlyphCount);
} else {
fakeGlyphCount = glyphProcessing(chars, offset, count, max, rightToLeft, fFeatureTags, fakeGlyphs, tempCharIndices, success);
//adjustGlyphs(chars, offset, count, rightToLeft, fakeGlyphs, fakeGlyphCount);
}
outGlyphCount = glyphPostProcessing(fakeGlyphs, tempCharIndices, fakeGlyphCount, glyphs, charIndices, success);
if (outChars != chars) {
delete[] outChars;
}
if (fakeGlyphs != glyphs) {
delete[] fakeGlyphs;
}
if (tempCharIndices != charIndices) {
delete[] tempCharIndices;
}
return outGlyphCount;
}
// apply GPOS table, if any
void OpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse,
LEGlyphID glyphs[], le_int32 glyphCount, float positions[], LEErrorCode &success)
{
if (LE_FAILURE(success)) {
return;
}
if (chars == NULL || glyphs == NULL || positions == NULL || offset < 0 || count < 0) {
success = LE_ILLEGAL_ARGUMENT_ERROR;
return;
}
if (fGPOSTable != NULL) {
GlyphPositionAdjustment *adjustments = new GlyphPositionAdjustment[glyphCount];
if (adjustments == NULL) {
success = LE_MEMORY_ALLOCATION_ERROR;
return;
}
fGPOSTable->process(glyphs, adjustments, fFeatureTags, glyphCount, reverse, fScriptTag, fLangSysTag, fGDEFTable, fFontInstance, fFeatureOrder);
float xAdjust = 0, yAdjust = 0;
le_int32 i;
for (i = 0; i < glyphCount; i += 1) {
float xPlacement = fFontInstance->xUnitsToPoints(adjustments[i].getXPlacement());
float xAdvance = fFontInstance->xUnitsToPoints(adjustments[i].getXAdvance());
float yPlacement = fFontInstance->yUnitsToPoints(adjustments[i].getYPlacement());
float yAdvance = fFontInstance->yUnitsToPoints(adjustments[i].getYAdvance());
xAdjust += xPlacement;
yAdjust += yPlacement;
positions[i*2] += xAdjust;
positions[i*2+1] += yAdjust;
xAdjust += xAdvance;
yAdjust += yAdvance;
}
positions[glyphCount*2] += xAdjust;
positions[glyphCount*2+1] += yAdjust;
delete[] adjustments;
}
delete[] fFeatureTags;
fFeatureTags = NULL;
}
U_NAMESPACE_END
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