535 lines
14 KiB
C++
535 lines
14 KiB
C++
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/*
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* %W% %E%
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*
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* (C) Copyright IBM Corp. 1998-2003 - 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 "HanLayoutEngine.h"
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#include "IndicLayoutEngine.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 "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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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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const char LayoutEngine::fgClassID=0;
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LayoutEngine::LayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
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: fGlyphCount(0), fGlyphs(NULL), fCharIndices(NULL), fPositions(NULL),
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fFontInstance(fontInstance), fScriptCode(scriptCode), fLanguageCode(languageCode)
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{
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// nothing else to do?
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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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le_int32 i;
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if LE_FAILURE(success) {
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return;
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}
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if (charIndices == NULL) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (fCharIndices == NULL) {
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success = LE_NO_LAYOUT_ERROR;
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return;
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}
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for (i = 0; i < fGlyphCount; i += 1) {
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charIndices[i] = fCharIndices[i] + indexBase;
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}
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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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if LE_FAILURE(success) {
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return;
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}
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if (charIndices == NULL) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (fCharIndices == NULL) {
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success = LE_NO_LAYOUT_ERROR;
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return;
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}
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LE_ARRAY_COPY(charIndices, fCharIndices, fGlyphCount);
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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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le_int32 i;
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if (LE_FAILURE(success)) {
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return;
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}
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if (glyphs == NULL) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (fGlyphs == NULL) {
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success = LE_NO_LAYOUT_ERROR;
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return;
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}
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for (i = 0; i < fGlyphCount; i += 1) {
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glyphs[i] = fGlyphs[i] | extraBits;
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}
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}
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void LayoutEngine::getGlyphs(LEGlyphID glyphs[], LEErrorCode &success) const
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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 (glyphs == NULL) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (fGlyphs == NULL) {
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success = LE_NO_LAYOUT_ERROR;
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return;
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}
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LE_ARRAY_COPY(glyphs, fGlyphs, fGlyphCount);
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}
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void LayoutEngine::getGlyphPositions(float positions[], LEErrorCode &success) const
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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 (positions == NULL) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (fPositions == NULL) {
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success = LE_NO_LAYOUT_ERROR;
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return;
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}
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LE_ARRAY_COPY(positions, fPositions, fGlyphCount * 2 + 2);
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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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if (LE_FAILURE(success)) {
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return;
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}
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if (glyphIndex > fGlyphCount) {
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success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
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return;
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}
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if (fPositions == NULL) {
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success = LE_NO_LAYOUT_ERROR;
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return;
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}
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x = fPositions[glyphIndex * 2];
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y = fPositions[glyphIndex * 2 + 1];
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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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LEGlyphID *&glyphs, le_int32 *&charIndices, 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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mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphs, charIndices, success);
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return count;
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}
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// Input: glyphs
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// Output: positions
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void LayoutEngine::positionGlyphs(const LEGlyphID glyphs[], le_int32 glyphCount, float x, float y, float *&positions, 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 (glyphCount < 0) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if (positions == NULL) {
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positions = LE_NEW_ARRAY(float, 2 * (glyphCount + 1));
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if (positions == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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le_int32 i;
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for (i = 0; i < glyphCount; i += 1) {
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LEPoint advance;
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positions[i * 2] = x;
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positions[i * 2 + 1] = y;
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fFontInstance->getGlyphAdvance(glyphs[i], advance);
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x += advance.fX;
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y += advance.fY;
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}
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positions[glyphCount * 2] = x;
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positions[glyphCount * 2 + 1] = y;
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}
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void LayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool /*reverse*/, LEGlyphID glyphs[], le_int32 glyphCount, float positions[], 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 || glyphs == NULL || positions == NULL || offset < 0 || count < 0 || glyphCount < 0) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return;
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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(const LEGlyphID glyphs[], le_int32 glyphCount, le_bool reverse, LEGlyphFilter *markFilter,
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float positions[], LEErrorCode &success)
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{
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float xAdjust = 0;
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le_int32 g = 0, direction = 1;
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le_int32 p;
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if (LE_FAILURE(success)) {
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return;
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}
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if (positions == NULL || 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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g = glyphCount - 1;
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direction = -1;
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}
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for (p = 0; p < glyphCount; p += 1, g += direction) {
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float xAdvance = positions[(p + 1) * 2] - positions[p * 2];
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positions[p * 2] += xAdjust;
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if (markFilter->accept(glyphs[g])) {
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xAdjust -= xAdvance;
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}
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}
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positions[glyphCount * 2] += xAdjust;
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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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LEGlyphID *&glyphs, le_int32 *&charIndices, 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 (glyphs == NULL) {
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glyphs = LE_NEW_ARRAY(LEGlyphID, count);
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if (glyphs == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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if (charIndices == NULL) {
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le_int32 i, dir = 1, out = 0;
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if (reverse) {
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out = count - 1;
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dir = -1;
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}
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charIndices = LE_NEW_ARRAY(le_int32, count);
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if (charIndices == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return;
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}
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for (i = 0; i < count; i += 1, out += dir) {
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charIndices[out] = i;
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}
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}
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DefaultCharMapper charMapper(TRUE, mirror);
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fFontInstance->mapCharsToGlyphs(chars, offset, count, reverse, &charMapper, glyphs);
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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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fGlyphCount = computeGlyphs(chars, offset, count, max, rightToLeft, fGlyphs, fCharIndices, success);
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positionGlyphs(fGlyphs, fGlyphCount, x, y, fPositions, success);
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adjustGlyphPositions(chars, offset, count, rightToLeft, fGlyphs, fGlyphCount, fPositions, success);
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return fGlyphCount;
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}
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void LayoutEngine::reset()
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{
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fGlyphCount = 0;
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if (fGlyphs != NULL) {
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LE_DELETE_ARRAY(fGlyphs);
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fGlyphs = NULL;
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}
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if (fCharIndices != NULL) {
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LE_DELETE_ARRAY(fCharIndices);
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fCharIndices = NULL;
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}
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if (fPositions != NULL) {
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LE_DELETE_ARRAY(fPositions);
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fPositions = NULL;
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}
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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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static le_uint32 gsubTableTag = LE_GSUB_TABLE_TAG;
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static 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, gsubTable);
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break;
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case arabScriptCode:
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result = new ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, 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)) {
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result = new HanOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, 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, gsubTable);
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break;
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}
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break;
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default:
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result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, 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);
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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);
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break;
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//case hebrScriptCode:
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// return new HebrewOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode);
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case thaiScriptCode:
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result = new ThaiLayoutEngine(fontInstance, scriptCode, languageCode);
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break;
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default:
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result = new LayoutEngine(fontInstance, scriptCode, languageCode);
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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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}
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LayoutEngine::~LayoutEngine() {
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reset();
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}
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U_NAMESPACE_END
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