537 lines
16 KiB
C++
537 lines
16 KiB
C++
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/*
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*
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* (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "LEScripts.h"
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#include "LELanguages.h"
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#include "LayoutEngine.h"
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#include "ArabicLayoutEngine.h"
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#include "CanonShaping.h"
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#include "HanLayoutEngine.h"
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#include "IndicLayoutEngine.h"
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#include "KhmerLayoutEngine.h"
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#include "ThaiLayoutEngine.h"
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#include "GXLayoutEngine.h"
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#include "ScriptAndLanguageTags.h"
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#include "CharSubstitutionFilter.h"
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#include "LEGlyphStorage.h"
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#include "OpenTypeUtilities.h"
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#include "GlyphSubstitutionTables.h"
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#include "MorphTables.h"
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#include "DefaultCharMapper.h"
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#include "KernTable.h"
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U_NAMESPACE_BEGIN
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#define ARRAY_SIZE(array) (sizeof array / sizeof array[0])
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const LEUnicode32 DefaultCharMapper::controlChars[] = {
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0x0009, 0x000A, 0x000D,
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/*0x200C, 0x200D,*/ 0x200E, 0x200F,
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0x2028, 0x2029, 0x202A, 0x202B, 0x202C, 0x202D, 0x202E,
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0x206A, 0x206B, 0x206C, 0x206D, 0x206E, 0x206F
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};
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const le_int32 DefaultCharMapper::controlCharsCount = ARRAY_SIZE(controlChars);
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const LEUnicode32 DefaultCharMapper::mirroredChars[] = {
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0x0028, 0x0029, // ascii paired punctuation
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0x003c, 0x003e,
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0x005b, 0x005d,
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0x007b, 0x007d,
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0x2045, 0x2046, // math symbols (not complete)
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0x207d, 0x207e,
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0x208d, 0x208e,
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0x2264, 0x2265,
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0x3008, 0x3009, // chinese paired punctuation
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0x300a, 0x300b,
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0x300c, 0x300d,
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0x300e, 0x300f,
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0x3010, 0x3011,
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0x3014, 0x3015,
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0x3016, 0x3017,
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0x3018, 0x3019,
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0x301a, 0x301b
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};
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const le_int32 DefaultCharMapper::mirroredCharsCount = ARRAY_SIZE(mirroredChars);
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LEUnicode32 DefaultCharMapper::mapChar(LEUnicode32 ch) const
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{
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if (fFilterControls) {
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le_int32 index = OpenTypeUtilities::search((le_uint32)ch, (le_uint32 *)controlChars, controlCharsCount);
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if (controlChars[index] == ch) {
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return 0xFFFF;
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}
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}
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if (fMirror) {
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le_int32 index = OpenTypeUtilities::search((le_uint32) ch, (le_uint32 *)mirroredChars, mirroredCharsCount);
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if (mirroredChars[index] == ch) {
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le_int32 mirrorOffset = ((index & 1) == 0) ? 1 : -1;
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return mirroredChars[index + mirrorOffset];
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}
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}
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return ch;
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}
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// This is here to get it out of LEGlyphFilter.h.
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// No particular reason to put it here, other than
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// this is a good central location...
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LEGlyphFilter::~LEGlyphFilter()
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{
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// nothing to do
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}
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CharSubstitutionFilter::CharSubstitutionFilter(const LEFontInstance *fontInstance)
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: fFontInstance(fontInstance)
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{
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// nothing to do
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}
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CharSubstitutionFilter::~CharSubstitutionFilter()
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{
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// nothing to do
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}
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LayoutEngine)
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static const LETag emptyTag = 0x00000000;
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static const LETag ccmpFeatureTag = LE_CCMP_FEATURE_TAG;
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static const LETag canonFeatures[] = {ccmpFeatureTag, emptyTag};
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LayoutEngine::LayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags)
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: fGlyphStorage(NULL), fFontInstance(fontInstance), fScriptCode(scriptCode), fLanguageCode(languageCode),
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fTypoFlags(typoFlags)
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{
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fGlyphStorage = new LEGlyphStorage();
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}
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le_int32 LayoutEngine::getGlyphCount() const
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{
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return fGlyphStorage->getGlyphCount();
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}
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void LayoutEngine::getCharIndices(le_int32 charIndices[], le_int32 indexBase, LEErrorCode &success) const
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{
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fGlyphStorage->getCharIndices(charIndices, indexBase, success);
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}
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void LayoutEngine::getCharIndices(le_int32 charIndices[], LEErrorCode &success) const
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{
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fGlyphStorage->getCharIndices(charIndices, success);
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}
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// Copy the glyphs into caller's (32-bit) glyph array, OR in extraBits
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void LayoutEngine::getGlyphs(le_uint32 glyphs[], le_uint32 extraBits, LEErrorCode &success) const
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{
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fGlyphStorage->getGlyphs(glyphs, extraBits, success);
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}
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void LayoutEngine::getGlyphs(LEGlyphID glyphs[], LEErrorCode &success) const
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{
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fGlyphStorage->getGlyphs(glyphs, success);
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}
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void LayoutEngine::getGlyphPositions(float positions[], LEErrorCode &success) const
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{
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fGlyphStorage->getGlyphPositions(positions, success);
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}
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void LayoutEngine::getGlyphPosition(le_int32 glyphIndex, float &x, float &y, LEErrorCode &success) const
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{
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fGlyphStorage->getGlyphPosition(glyphIndex, x, y, success);
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}
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le_int32 LayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
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LEUnicode *&outChars, 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 (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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const GlyphSubstitutionTableHeader *canonGSUBTable = (GlyphSubstitutionTableHeader *) CanonShaping::glyphSubstitutionTable;
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LETag scriptTag = OpenTypeLayoutEngine::getScriptTag(fScriptCode);
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LETag langSysTag = OpenTypeLayoutEngine::getLangSysTag(fLanguageCode);
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le_int32 i, dir = 1, out = 0, outCharCount = count;
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if (canonGSUBTable->coversScript(scriptTag)) {
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CharSubstitutionFilter *substitutionFilter = new CharSubstitutionFilter(fFontInstance);
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glyphStorage.allocateGlyphArray(count, rightToLeft, success);
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glyphStorage.allocateAuxData(success);
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if (LE_FAILURE(success)) {
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return 0;
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}
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if (rightToLeft) {
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out = count - 1;
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dir = -1;
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}
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for (i = 0; i < count; i += 1, out += dir) {
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glyphStorage[out] = (LEGlyphID) chars[offset + i];
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glyphStorage.setAuxData(out, (void *) canonFeatures, success);
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}
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outCharCount = canonGSUBTable->process(glyphStorage, rightToLeft, scriptTag, langSysTag, NULL, substitutionFilter, NULL);
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out = (rightToLeft? count - 1 : 0);
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outChars = LE_NEW_ARRAY(LEUnicode, outCharCount);
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for (i = 0; i < outCharCount; i += 1, out += dir) {
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outChars[out] = (LEUnicode) LE_GET_GLYPH(glyphStorage[i]);
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}
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delete substitutionFilter;
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}
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return outCharCount;
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}
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le_int32 LayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
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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 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 = NULL;
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le_int32 outCharCount = characterProcessing(chars, offset, count, max, rightToLeft, outChars, glyphStorage, success);
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if (outChars != NULL) {
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mapCharsToGlyphs(outChars, 0, outCharCount, rightToLeft, rightToLeft, glyphStorage, success);
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LE_DELETE_ARRAY(outChars); // FIXME: a subclass may have allocated this, in which case this delete might not work...
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} else {
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mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphStorage, success);
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}
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return glyphStorage.getGlyphCount();
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}
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// Input: glyphs
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// Output: positions
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void LayoutEngine::positionGlyphs(LEGlyphStorage &glyphStorage, float x, float y, 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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glyphStorage.allocatePositions(success);
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if (LE_FAILURE(success)) {
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return;
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}
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le_int32 i, glyphCount = glyphStorage.getGlyphCount();
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for (i = 0; i < glyphCount; i += 1) {
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LEPoint advance;
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glyphStorage.setPosition(i, x, y, success);
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fFontInstance->getGlyphAdvance(glyphStorage[i], advance);
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x += advance.fX;
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y += advance.fY;
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}
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glyphStorage.setPosition(glyphCount, x, y, success);
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}
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void LayoutEngine::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 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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void LayoutEngine::adjustMarkGlyphs(LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success)
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{
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float xAdjust = 0;
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le_int32 p, glyphCount = glyphStorage.getGlyphCount();
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if (LE_FAILURE(success)) {
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return;
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}
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if (markFilter == NULL) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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float ignore, prev;
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glyphStorage.getGlyphPosition(0, prev, ignore, success);
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for (p = 0; p < glyphCount; p += 1) {
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float next, xAdvance;
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glyphStorage.getGlyphPosition(p + 1, next, ignore, success);
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xAdvance = next - prev;
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glyphStorage.adjustPosition(p, xAdjust, 0, success);
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if (markFilter->accept(glyphStorage[p])) {
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xAdjust -= xAdvance;
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}
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prev = next;
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}
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glyphStorage.adjustPosition(glyphCount, xAdjust, 0, success);
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}
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void LayoutEngine::adjustMarkGlyphs(const LEUnicode chars[], le_int32 charCount, le_bool reverse, LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success)
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{
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float xAdjust = 0;
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le_int32 c = 0, direction = 1, p;
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le_int32 glyphCount = glyphStorage.getGlyphCount();
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if (LE_FAILURE(success)) {
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return;
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}
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if (markFilter == NULL) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (reverse) {
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c = glyphCount - 1;
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direction = -1;
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}
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float ignore, prev;
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glyphStorage.getGlyphPosition(0, prev, ignore, success);
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for (p = 0; p < charCount; p += 1, c += direction) {
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float next, xAdvance;
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glyphStorage.getGlyphPosition(p + 1, next, ignore, success);
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xAdvance = next - prev;
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glyphStorage.adjustPosition(p, xAdjust, 0, success);
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if (markFilter->accept(chars[c])) {
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xAdjust -= xAdvance;
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}
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prev = next;
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}
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glyphStorage.adjustPosition(glyphCount, xAdjust, 0, success);
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}
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const void *LayoutEngine::getFontTable(LETag tableTag) const
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{
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return fFontInstance->getFontTable(tableTag);
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}
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void LayoutEngine::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool mirror,
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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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glyphStorage.allocateGlyphArray(count, reverse, success);
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DefaultCharMapper charMapper(TRUE, mirror);
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fFontInstance->mapCharsToGlyphs(chars, offset, count, reverse, &charMapper, glyphStorage);
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}
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// Input: characters, font?
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// Output: glyphs, positions, char indices
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// Returns: number of glyphs
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le_int32 LayoutEngine::layoutChars(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
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float x, float y, 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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le_int32 glyphCount;
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glyphCount = computeGlyphs(chars, offset, count, max, rightToLeft, *fGlyphStorage, success);
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positionGlyphs(*fGlyphStorage, x, y, success);
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adjustGlyphPositions(chars, offset, count, rightToLeft, *fGlyphStorage, success);
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return glyphCount;
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}
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void LayoutEngine::reset()
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{
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fGlyphStorage->reset();
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}
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LayoutEngine *LayoutEngine::layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, LEErrorCode &success)
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{
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// 3 -> kerning and ligatures
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return LayoutEngine::layoutEngineFactory(fontInstance, scriptCode, languageCode, 3, success);
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}
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LayoutEngine *LayoutEngine::layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
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{
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static const le_uint32 gsubTableTag = LE_GSUB_TABLE_TAG;
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static const le_uint32 mortTableTag = LE_MORT_TABLE_TAG;
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if (LE_FAILURE(success)) {
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return NULL;
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}
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const GlyphSubstitutionTableHeader *gsubTable = (const GlyphSubstitutionTableHeader *) fontInstance->getFontTable(gsubTableTag);
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LayoutEngine *result = NULL;
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LETag scriptTag = 0x00000000;
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LETag languageTag = 0x00000000;
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if (gsubTable != NULL && gsubTable->coversScript(scriptTag = OpenTypeLayoutEngine::getScriptTag(scriptCode))) {
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switch (scriptCode) {
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case bengScriptCode:
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case devaScriptCode:
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case gujrScriptCode:
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case kndaScriptCode:
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case mlymScriptCode:
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case oryaScriptCode:
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case guruScriptCode:
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case tamlScriptCode:
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case teluScriptCode:
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result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable);
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break;
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case arabScriptCode:
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result = new ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable);
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break;
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case haniScriptCode:
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languageTag = OpenTypeLayoutEngine::getLangSysTag(languageCode);
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switch (languageCode) {
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case korLanguageCode:
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case janLanguageCode:
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case zhtLanguageCode:
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case zhsLanguageCode:
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if (gsubTable->coversScriptAndLanguage(scriptTag, languageTag, TRUE)) {
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result = new HanOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable);
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break;
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}
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// note: falling through to default case.
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default:
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result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable);
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break;
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}
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break;
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case khmrScriptCode:
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result = new KhmerOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable);
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break;
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default:
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result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable);
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break;
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}
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} else {
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const MorphTableHeader *morphTable = (MorphTableHeader *) fontInstance->getFontTable(mortTableTag);
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if (morphTable != NULL) {
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result = new GXLayoutEngine(fontInstance, scriptCode, languageCode, morphTable);
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} else {
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switch (scriptCode) {
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case bengScriptCode:
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case devaScriptCode:
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case gujrScriptCode:
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case kndaScriptCode:
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case mlymScriptCode:
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case oryaScriptCode:
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case guruScriptCode:
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case tamlScriptCode:
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case teluScriptCode:
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{
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result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags);
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break;
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}
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case arabScriptCode:
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//case hebrScriptCode:
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result = new UnicodeArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags);
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break;
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//case hebrScriptCode:
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// return new HebrewOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags);
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case thaiScriptCode:
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result = new ThaiLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags);
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break;
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default:
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result = new LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags);
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break;
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}
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}
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}
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if (result == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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}
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return result;
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}
|
|
|
|
LayoutEngine::~LayoutEngine() {
|
|
reset();
|
|
}
|
|
|
|
U_NAMESPACE_END
|