656 lines
20 KiB
C++
656 lines
20 KiB
C++
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/*
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*
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* (C) Copyright IBM Corp. 1998-2009 - 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 "HangulLayoutEngine.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 "TibetanLayoutEngine.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 "GlyphDefinitionTables.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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/* Leave this copyright notice here! It needs to go somewhere in this library. */
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static const char copyright[] = U_COPYRIGHT_STRING;
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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 = LE_ARRAY_SIZE(controlChars);
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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 *)DefaultCharMapper::mirroredChars, DefaultCharMapper::mirroredCharsCount);
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if (mirroredChars[index] == ch) {
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return DefaultCharMapper::srahCderorrim[index];
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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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class CanonMarkFilter : public UMemory, public LEGlyphFilter
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{
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private:
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const GlyphClassDefinitionTable *classDefTable;
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CanonMarkFilter(const CanonMarkFilter &other); // forbid copying of this class
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CanonMarkFilter &operator=(const CanonMarkFilter &other); // forbid copying of this class
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public:
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CanonMarkFilter(const GlyphDefinitionTableHeader *gdefTable);
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virtual ~CanonMarkFilter();
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virtual le_bool accept(LEGlyphID glyph) const;
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};
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CanonMarkFilter::CanonMarkFilter(const GlyphDefinitionTableHeader *gdefTable)
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{
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classDefTable = gdefTable->getMarkAttachClassDefinitionTable();
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}
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CanonMarkFilter::~CanonMarkFilter()
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{
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// nothing to do?
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}
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le_bool CanonMarkFilter::accept(LEGlyphID glyph) const
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{
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le_int32 glyphClass = classDefTable->getGlyphClass(glyph);
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return glyphClass != 0;
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}
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LayoutEngine)
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#define ccmpFeatureTag LE_CCMP_FEATURE_TAG
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#define ccmpFeatureMask 0x80000000UL
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#define canonFeatures (ccmpFeatureMask)
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static const FeatureMap canonFeatureMap[] =
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{
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{ccmpFeatureTag, ccmpFeatureMask}
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};
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static const le_int32 canonFeatureMapCount = LE_ARRAY_SIZE(canonFeatureMap);
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LayoutEngine::LayoutEngine(const LEFontInstance *fontInstance,
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le_int32 scriptCode,
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le_int32 languageCode,
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le_int32 typoFlags,
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LEErrorCode &success)
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: fGlyphStorage(NULL), fFontInstance(fontInstance), fScriptCode(scriptCode), fLanguageCode(languageCode),
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fTypoFlags(typoFlags), fFilterZeroWidth(TRUE)
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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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fGlyphStorage = new LEGlyphStorage();
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if (fGlyphStorage == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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}
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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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if (substitutionFilter == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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const LEUnicode *inChars = &chars[offset];
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LEUnicode *reordered = NULL;
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LEGlyphStorage fakeGlyphStorage;
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fakeGlyphStorage.allocateGlyphArray(count, rightToLeft, success);
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if (LE_FAILURE(success)) {
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delete substitutionFilter;
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return 0;
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}
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// This is the cheapest way to get mark reordering only for Hebrew.
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// We could just do the mark reordering for all scripts, but most
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// of them probably don't need it...
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if (fScriptCode == hebrScriptCode) {
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reordered = LE_NEW_ARRAY(LEUnicode, count);
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if (reordered == NULL) {
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delete substitutionFilter;
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success = LE_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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CanonShaping::reorderMarks(&chars[offset], count, rightToLeft, reordered, fakeGlyphStorage);
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inChars = reordered;
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}
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fakeGlyphStorage.allocateAuxData(success);
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if (LE_FAILURE(success)) {
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delete substitutionFilter;
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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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fakeGlyphStorage[out] = (LEGlyphID) inChars[i];
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fakeGlyphStorage.setAuxData(out, canonFeatures, success);
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}
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if (reordered != NULL) {
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LE_DELETE_ARRAY(reordered);
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}
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outCharCount = canonGSUBTable->process(fakeGlyphStorage, rightToLeft, scriptTag, langSysTag, NULL, substitutionFilter, canonFeatureMap, canonFeatureMapCount, FALSE, success);
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if (LE_FAILURE(success)) {
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delete substitutionFilter;
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return 0;
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}
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out = (rightToLeft? outCharCount - 1 : 0);
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/*
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* The char indices array in fakeGlyphStorage has the correct mapping
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* back to the original input characters. Save it in glyphStorage. The
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* subsequent call to glyphStoratge.allocateGlyphArray will keep this
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* array rather than allocating and initializing a new one.
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*/
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glyphStorage.adoptCharIndicesArray(fakeGlyphStorage);
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outChars = LE_NEW_ARRAY(LEUnicode, outCharCount);
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if (outChars == NULL) {
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delete substitutionFilter;
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success = LE_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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for (i = 0; i < outCharCount; i += 1, out += dir) {
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outChars[out] = (LEUnicode) LE_GET_GLYPH(fakeGlyphStorage[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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GlyphDefinitionTableHeader *gdefTable = (GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable;
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CanonMarkFilter filter(gdefTable);
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adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success);
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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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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, fFilterZeroWidth, 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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if (fGlyphStorage->getGlyphCount() > 0) {
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fGlyphStorage->reset();
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}
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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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LETag v2ScriptTag = OpenTypeLayoutEngine::getV2ScriptTag(scriptCode);
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// Right now, only invoke V2 processing for Devanagari. TODO: Allow more V2 scripts as they are
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// properly tested.
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if ( v2ScriptTag == dev2ScriptTag && gsubTable != NULL && gsubTable->coversScript( v2ScriptTag )) {
|
|
result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, TRUE, gsubTable, success);
|
|
}
|
|
else if (gsubTable != NULL && gsubTable->coversScript(scriptTag = OpenTypeLayoutEngine::getScriptTag(scriptCode))) {
|
|
switch (scriptCode) {
|
|
case bengScriptCode:
|
|
case devaScriptCode:
|
|
case gujrScriptCode:
|
|
case kndaScriptCode:
|
|
case mlymScriptCode:
|
|
case oryaScriptCode:
|
|
case guruScriptCode:
|
|
case tamlScriptCode:
|
|
case teluScriptCode:
|
|
case sinhScriptCode:
|
|
result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, FALSE, gsubTable, success);
|
|
break;
|
|
|
|
case arabScriptCode:
|
|
result = new ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success);
|
|
break;
|
|
|
|
case hangScriptCode:
|
|
result = new HangulOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success);
|
|
break;
|
|
|
|
case haniScriptCode:
|
|
languageTag = OpenTypeLayoutEngine::getLangSysTag(languageCode);
|
|
|
|
switch (languageCode) {
|
|
case korLanguageCode:
|
|
case janLanguageCode:
|
|
case zhtLanguageCode:
|
|
case zhsLanguageCode:
|
|
if (gsubTable->coversScriptAndLanguage(scriptTag, languageTag, TRUE)) {
|
|
result = new HanOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success);
|
|
break;
|
|
}
|
|
|
|
// note: falling through to default case.
|
|
default:
|
|
result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success);
|
|
break;
|
|
}
|
|
|
|
break;
|
|
|
|
case tibtScriptCode:
|
|
result = new TibetanOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success);
|
|
break;
|
|
|
|
case khmrScriptCode:
|
|
result = new KhmerOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success);
|
|
break;
|
|
|
|
default:
|
|
result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success);
|
|
break;
|
|
}
|
|
} else {
|
|
const MorphTableHeader *morphTable = (MorphTableHeader *) fontInstance->getFontTable(mortTableTag);
|
|
|
|
if (morphTable != NULL) {
|
|
result = new GXLayoutEngine(fontInstance, scriptCode, languageCode, morphTable, success);
|
|
} else {
|
|
switch (scriptCode) {
|
|
case bengScriptCode:
|
|
case devaScriptCode:
|
|
case gujrScriptCode:
|
|
case kndaScriptCode:
|
|
case mlymScriptCode:
|
|
case oryaScriptCode:
|
|
case guruScriptCode:
|
|
case tamlScriptCode:
|
|
case teluScriptCode:
|
|
case sinhScriptCode:
|
|
{
|
|
result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success);
|
|
break;
|
|
}
|
|
|
|
case arabScriptCode:
|
|
//case hebrScriptCode:
|
|
result = new UnicodeArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success);
|
|
break;
|
|
|
|
//case hebrScriptCode:
|
|
// return new HebrewOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags);
|
|
|
|
case thaiScriptCode:
|
|
result = new ThaiLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success);
|
|
break;
|
|
|
|
case hangScriptCode:
|
|
result = new HangulOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success);
|
|
break;
|
|
|
|
default:
|
|
result = new LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (result && LE_FAILURE(success)) {
|
|
delete result;
|
|
result = NULL;
|
|
}
|
|
|
|
if (result == NULL) {
|
|
success = LE_MEMORY_ALLOCATION_ERROR;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
LayoutEngine::~LayoutEngine() {
|
|
delete fGlyphStorage;
|
|
}
|
|
|
|
U_NAMESPACE_END
|