C++ LE_FAILURE函数代码示例

// Input: characters, tags
// Output: glyphs, char indices
le_int32 IndicOpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
                    LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
        success = LE_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    le_int32 retCount = OpenTypeLayoutEngine::glyphProcessing(chars, offset, count, max, rightToLeft, glyphStorage, success);

    if (LE_FAILURE(success)) {
        return 0;
    }

    if (fVersion2) {
        IndicReordering::finalReordering(glyphStorage,retCount);
        IndicReordering::applyPresentationForms(glyphStorage,retCount);
        OpenTypeLayoutEngine::glyphSubstitution(count,max, rightToLeft, glyphStorage, success);
    } else {
        IndicReordering::adjustMPres(fMPreFixups, glyphStorage, success);
    }
    return retCount;
}

U_NAMESPACE_BEGIN

le_uint32 LookupProcessor::applyLookupTable(const LookupTable *lookupTable, GlyphIterator *glyphIterator,
                                         const LEFontInstance *fontInstance, LEErrorCode& success) const
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    le_uint16 lookupType = SWAPW(lookupTable->lookupType);
    le_uint16 subtableCount = SWAPW(lookupTable->subTableCount);
    le_int32 startPosition = glyphIterator->getCurrStreamPosition();
    le_uint32 delta;

    for (le_uint16 subtable = 0; subtable < subtableCount; subtable += 1) {
        const LookupSubtable *lookupSubtable = lookupTable->getLookupSubtable(subtable);

        delta = applySubtable(lookupSubtable, lookupType, glyphIterator, fontInstance, success);

        if (delta > 0 && LE_FAILURE(success)) {
            return 1;
        }

        glyphIterator->setCurrStreamPosition(startPosition);
    }

    return 1;
}

// Input: characters
// Output: characters, char indices, tags
// Returns: output character count
le_int32 ArabicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
        LEUnicode *&/*outChars*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
        success = LE_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    glyphStorage.adoptGlyphCount(count);
    glyphStorage.allocateAuxData(success);

    if (LE_FAILURE(success)) {
        success = LE_MEMORY_ALLOCATION_ERROR;
        return 0;
    }

    switch (fScriptCode) {
    case arabScriptCode:
    {
        ArabicShaping::shape(chars, offset, count, max, rightToLeft, glyphStorage);
        break;
    }

    case hebrScriptCode:
        HebrewShaping::shape(chars, offset, count, max, rightToLeft, glyphStorage);
        break;
    }

    return count;
}

// Input: characters, tags
// Output: glyphs, char indices
le_int32 OpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
                                               LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
        success = LE_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphStorage, success);

    if (LE_FAILURE(success)) {
        return 0;
    }
    
    if (fGSUBTable.isValid()) {
      if (fScriptTagV2 != nullScriptTag && fGSUBTable->coversScriptAndLanguage(fGSUBTable, fScriptTagV2, fLangSysTag, success)) { 
          count = fGSUBTable->process(fGSUBTable, glyphStorage, rightToLeft, fScriptTagV2, fLangSysTag, fGDEFTable, fSubstitutionFilter,
                                    fFeatureMap, fFeatureMapCount, fFeatureOrder, success);

        } else {
          count = fGSUBTable->process(fGSUBTable, glyphStorage, rightToLeft, fScriptTag, fLangSysTag, fGDEFTable, fSubstitutionFilter,
                                    fFeatureMap, fFeatureMapCount, fFeatureOrder, success);
        }
    }

    return count;
}

U_NAMESPACE_BEGIN

le_uint32 LookupProcessor::applyLookupTable(const LEReferenceTo<LookupTable> &lookupTable, GlyphIterator *glyphIterator,
                                         const LEFontInstance *fontInstance, LEErrorCode& success) const
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    le_uint16 lookupType = SWAPW(lookupTable->lookupType);
    le_uint16 subtableCount = SWAPW(lookupTable->subTableCount);
    le_int32 startPosition = glyphIterator->getCurrStreamPosition();
    le_uint32 delta;

    for (le_uint16 subtable = 0; subtable < subtableCount; subtable += 1) {
      LEReferenceTo<LookupSubtable> lookupSubtable = lookupTable->getLookupSubtable(lookupTable, subtable, success);

        delta = applySubtable(lookupSubtable, lookupType, glyphIterator, fontInstance, success);
        if (delta > 0 && LE_FAILURE(success)) {
#if LE_TRACE
          _LETRACE("Posn #%d, type %X, applied subtable #%d/%d - %s\n", startPosition, lookupType, subtable, subtableCount, u_errorName((UErrorCode)success));
#endif
          return 1;
        }

        glyphIterator->setCurrStreamPosition(startPosition);
    }

    return 1;
}

// Input: glyphs
// Output: positions
void LayoutEngine::positionGlyphs(LEGlyphStorage &glyphStorage, float x, float y, LEErrorCode &success)
{
    if (LE_FAILURE(success)) {
        return;
    }

    glyphStorage.allocatePositions(success);

    if (LE_FAILURE(success)) {
        return;
    }

    le_int32 i, glyphCount = glyphStorage.getGlyphCount();

    for (i = 0; i < glyphCount; i += 1) {
        LEPoint advance;

        glyphStorage.setPosition(i, x, y, success);

        fFontInstance->getGlyphAdvance(glyphStorage[i], advance);
        x += advance.fX;
        y += advance.fY;
    }

    glyphStorage.setPosition(glyphCount, x, y, success);
}

Paragraph::Paragraph(const LEUnicode chars[], int32_t charCount, const FontRuns *fontRuns, LEErrorCode &status)
  : fParagraphLayout(NULL), fLineCount(0), fLinesMax(0), fLinesGrow(LINE_GROW), fLines(NULL), fChars(NULL),
    fLineHeight(-1), fAscent(-1), fWidth(-1), fHeight(-1)
{
	if (LE_FAILURE(status)) {
		return;
	}

	LocaleRuns *locales = NULL;

    fChars = LE_NEW_ARRAY(LEUnicode, charCount);
    LE_ARRAY_COPY(fChars, chars, charCount);

    fParagraphLayout = new ParagraphLayout(fChars, charCount, fontRuns, NULL, NULL, locales, UBIDI_DEFAULT_LTR, FALSE, status);

	if (LE_FAILURE(status)) {
		return;
	}

    le_int32 ascent  = fParagraphLayout->getAscent();
    le_int32 descent = fParagraphLayout->getDescent();
    le_int32 leading = fParagraphLayout->getLeading();

    fLineHeight = ascent + descent + leading;
    fAscent     = ascent;
}

le_int32 OpenTypeLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    LEUnicode *outChars = NULL;
    LEGlyphStorage fakeGlyphStorage;
    le_int32 outCharCount, outGlyphCount, fakeGlyphCount;

    if (LE_FAILURE(success)) {
        return 0;
    }

    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
        success = LE_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    outCharCount = characterProcessing(chars, offset, count, max, rightToLeft, outChars, fakeGlyphStorage, success);
    
    if (LE_FAILURE(success)) {
        return 0;
    }

    if (outChars != NULL) {
        fakeGlyphCount = glyphProcessing(outChars, 0, outCharCount, outCharCount, rightToLeft, fakeGlyphStorage, success);
        LE_DELETE_ARRAY(outChars); // FIXME: a subclass may have allocated this, in which case this delete might not work...
        //adjustGlyphs(outChars, 0, outCharCount, rightToLeft, fakeGlyphs, fakeGlyphCount);
    } else {
        fakeGlyphCount = glyphProcessing(chars, offset, count, max, rightToLeft, fakeGlyphStorage, success);
        //adjustGlyphs(chars, offset, count, rightToLeft, fakeGlyphs, fakeGlyphCount);
    }

    outGlyphCount = glyphPostProcessing(fakeGlyphStorage, glyphStorage, success);

    return outGlyphCount;
}

le_int32 HanOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/,
        LEUnicode *&/*outChars*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
        success = LE_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    glyphStorage.allocateGlyphArray(count, FALSE, success);
    glyphStorage.allocateAuxData(success);

    if (LE_FAILURE(success)) {
        return 0;
    }

    // FIXME: do we want to add the 'trad' feature for 'ZHT' and the
    // 'smpl' feature for 'ZHS'? If we do this, we can remove the exact
    // flag from the language tag lookups, so we can use these features
    // with the default LangSys...
    for (le_int32 i = 0; i < count; i += 1) {
        glyphStorage.setAuxData(i, features, success);
    }

    return count;
}

const LEFontInstance *FontMap::getScriptFont(le_int32 scriptCode, LEErrorCode &status)
{
    if (LE_FAILURE(status)) {
        return NULL;
    }

    if (scriptCode <= -1 || scriptCode >= scriptCodeCount) {
        status = LE_ILLEGAL_ARGUMENT_ERROR;
        return NULL;
    }


    le_int32 fontIndex = fFontIndices[scriptCode];

    if (fontIndex < 0) {
        sprintf(errorMessage, "No font was set for script %s", uscript_getName((UScriptCode) scriptCode));
        fGUISupport->postErrorMessage(errorMessage, "Font Map Error");
        status = LE_FONT_FILE_NOT_FOUND_ERROR;
        return NULL;
    }

    if (fFontInstances[fontIndex] == NULL) {
        fFontInstances[fontIndex] = openFont(fFontNames[fontIndex], fPointSize, status);

        if (LE_FAILURE(status)) {
            sprintf(errorMessage, "Could not open font file %s", fFontNames[fontIndex]);
            fGUISupport->postErrorMessage(errorMessage, "Font Map Error");
            return NULL;
        }
    }

    return fFontInstances[fontIndex];
}

int main(int argc, char *argv[])
{
    le_int32 failures = 0;

    for (le_int32 test = 0; test < testCount; test += 1) {
        LEErrorCode fontStatus = LE_NO_ERROR;

        printf("Test %d, font = %s... ", test, testInputs[test].fontName);

        PortableFontInstance fontInstance(testInputs[test].fontName, 12, fontStatus);

        if (LE_FAILURE(fontStatus)) {
            printf("could not open font.\n");
            continue;
        }

        LEErrorCode success = LE_NO_ERROR;
        LayoutEngine *engine = LayoutEngine::layoutEngineFactory(&fontInstance, testInputs[test].scriptCode, -1, success);
        le_int32 textLength = testInputs[test].textLength;
        le_bool result;
        TestResult actual;

        if (LE_FAILURE(success)) {
            // would be nice to print the script name here, but
            // don't want to maintain a table, and don't want to
            // require ICU just for the script name...
            printf("could not create a LayoutEngine.\n");
            continue;
        }

        actual.glyphCount = engine->layoutChars(testInputs[test].text, 0, textLength, textLength, testInputs[test].rightToLeft, 0, 0, success);

        actual.glyphs    = new LEGlyphID[actual.glyphCount];
        actual.indices   = new le_int32[actual.glyphCount];
        actual.positions = new float[actual.glyphCount * 2 + 2];

        engine->getGlyphs(actual.glyphs, success);
        engine->getCharIndices(actual.indices, success);
        engine->getGlyphPositions(actual.positions, success);

        result = compareResults(test, &testResults[test], &actual);

        if (result) {
            printf("passed.\n");
        } else {
            failures += 1;
            printf("failed.\n");
        }

        delete[] actual.positions;
        delete[] actual.indices;
        delete[] actual.glyphs;
        delete   engine;
    }

    return failures;
}

LEReferenceTo<ScriptTable> ScriptListTable::findScript(const LETableReference &base, LETag scriptTag, LEErrorCode &success) const
{
    if (LE_FAILURE(success) ) {
        return LEReferenceTo<ScriptTable>(); // get out
    }
    /*
     * There are some fonts that have a large, bogus value for scriptCount. To try
     * and protect against this, we use the offset in the first scriptRecord,
     * which we know has to be past the end of the scriptRecordArray, to compute
     * a value which is greater than or equal to the actual script count.
     *
     * Note: normally, the first offset will point to just after the scriptRecordArray,
     * but there's no guarantee of this, only that it's *after* the scriptRecordArray.
     * Because of this, a binary serach isn't safe, because the new count may include
     * data that's not actually in the scriptRecordArray and hence the array will appear
     * to be unsorted.
     */
    le_uint16 count = SWAPW(scriptCount);

    if (count == 0) {
        return LEReferenceTo<ScriptTable>(); // no items, no search
    }

    // attempt to construct a ref with at least one element
    LEReferenceToArrayOf<ScriptRecord> oneElementTable(base, success, &scriptRecordArray[0], 1);

    if( LE_FAILURE(success) ) {
        return LEReferenceTo<ScriptTable>(); // couldn't even read the first record - bad font.
    }

    le_uint16 limit = ((SWAPW(scriptRecordArray[0].offset) - sizeof(ScriptListTable)) / sizeof(scriptRecordArray)) + ANY_NUMBER;
    Offset scriptTableOffset = 0;


    if (count > limit) {
        // the scriptCount value is bogus; do a linear search
        // because limit may still be too large.
        LEReferenceToArrayOf<ScriptRecord> scriptRecordArrayRef(base, success, &scriptRecordArray[0], limit);
        for(le_int32 s = 0; (s < limit)&&LE_SUCCESS(success); s += 1) {
            if (SWAPT(scriptRecordArrayRef(s,success).tag) == scriptTag) {
                scriptTableOffset = SWAPW(scriptRecordArrayRef(s,success).offset);
                break;
            }
        }
    } else {
        LEReferenceToArrayOf<ScriptRecord> scriptRecordArrayRef(base, success, &scriptRecordArray[0], count);

        scriptTableOffset = OpenTypeUtilities::getTagOffset(scriptTag, scriptRecordArrayRef, success);
    }

    if (scriptTableOffset != 0) {
        return LEReferenceTo<ScriptTable>(base, success, scriptTableOffset);
    }

    return LEReferenceTo<ScriptTable>();
}

XeTeXFontInst_FT2::XeTeXFontInst_FT2(const char* pathname, int index, float pointSize, LEErrorCode &status)
    : XeTeXFontInst(pointSize, status)
    , face(0)
    , fFreeTypeOnly(false)
{
    if (LE_FAILURE(status)) {
        return;
    }

	FT_Error	err;
	if (!gFreeTypeLibrary) {
		err = FT_Init_FreeType(&gFreeTypeLibrary);
		if (err != 0) {
			fprintf(stderr, "FreeType initialization failed! (%d)\n", err);
			exit(1);
		}
	}

	err = FT_New_Face(gFreeTypeLibrary, (char*)pathname, index, &face);

	if (err != 0) {
        status = LE_FONT_FILE_NOT_FOUND_ERROR;
        return;
    }

	/* for non-sfnt-packaged fonts (presumably Type 1), see if there is an AFM file we can attach */
	if (index == 0 && !FT_IS_SFNT(face)) {
		char*	afm = new char[strlen((const char*)pathname) + 5];	// room to append ".afm"
		strcpy(afm, (const char*)pathname);
		char*	p = strrchr(afm, '.');
		if (p == NULL || strlen(p) != 4 || tolower(*(p+1)) != 'p' || tolower(*(p+2)) != 'f')
			strcat(afm, ".afm");	// append .afm if the extension didn't seem to be .pf[ab]
		else
			strcpy(p, ".afm");		// else replace extension with .afm
		FT_Attach_File(face, afm);	// ignore error code; AFM might not exist
		delete[] afm;
		fFreeTypeOnly = true;
	}

	initialize(status);

	if (LE_FAILURE(status))
		return;
	
	char	buf[20];
	if (index > 0)
		sprintf(buf, ":%d", index);
	else
		buf[0] = 0;
	fFilename = new char[strlen(pathname) + 2 + strlen(buf) + 1];
	sprintf(fFilename, "[%s%s]", pathname, buf);
}

le_uint32 PairPositioningFormat1Subtable::process(const LEReferenceTo<PairPositioningFormat1Subtable> &base, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode &success) const
{
    LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
    le_int32 coverageIndex = getGlyphCoverage(base, firstGlyph, success);

    if (LE_FAILURE(success)) {
      return 0;
    }
    GlyphIterator tempIterator(*glyphIterator);

    if (coverageIndex >= 0 && glyphIterator->next()) {
        Offset pairSetTableOffset = SWAPW(pairSetTableOffsetArray[coverageIndex]);
        LEReferenceTo<PairSetTable> pairSetTable(base, success, ((char *) this + pairSetTableOffset));
        if (LE_FAILURE(success)) {
          return 0;
        }
        le_uint16 pairValueCount = SWAPW(pairSetTable->pairValueCount);
        le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
        le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
        le_int16 recordSize = sizeof(PairValueRecord) - sizeof(ValueRecord) + valueRecord1Size + valueRecord2Size;
        LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
        LEReferenceTo<PairValueRecord> pairValueRecord;

        if (pairValueCount != 0) {
            pairValueRecord = findPairValueRecord(base, (TTGlyphID) LE_GET_GLYPH(secondGlyph), pairSetTable->pairValueRecordArray, pairValueCount, recordSize, success);
        }

        if (pairValueRecord.isEmpty()) {
            return 0;
        }

        if (valueFormat1 != 0) {
            pairValueRecord->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
        }

        if (valueFormat2 != 0) {
            const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &pairValueRecord->valueRecord1 + valueRecord1Size);

            valueRecord2->adjustPosition(SWAPW(valueFormat2), (char *) this, *glyphIterator, fontInstance);
        }

        // back up glyphIterator so second glyph can be
        // first glyph in the next pair
        glyphIterator->prev();
        return 1;
    }

    return 0;
}

le_int32 LayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
                LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    if (offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
        success = LE_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    const GlyphSubstitutionTableHeader *canonGSUBTable = (GlyphSubstitutionTableHeader *) CanonShaping::glyphSubstitutionTable;
    LETag scriptTag  = OpenTypeLayoutEngine::getScriptTag(fScriptCode);
    LETag langSysTag = OpenTypeLayoutEngine::getLangSysTag(fLanguageCode);
    le_int32 i, dir = 1, out = 0, outCharCount = count;

    if (rightToLeft) {
        out = count - 1;
        dir = -1;
    }

    if (canonGSUBTable->coversScript(scriptTag)) {
        CharSubstitutionFilter *substitutionFilter = new CharSubstitutionFilter(fFontInstance);

        glyphStorage.allocateGlyphArray(count, rightToLeft, success);
        glyphStorage.allocateAuxData(success);

        if (LE_FAILURE(success)) {
            return 0;
        }

        for (i = 0; i < count; i += 1, out += dir) {
            glyphStorage[i] = (LEGlyphID) chars[offset + i];
            glyphStorage.setAuxData(i, (void *) canonFeatures, success);
        }

        outCharCount = canonGSUBTable->process(glyphStorage, rightToLeft, scriptTag, langSysTag, NULL, substitutionFilter, NULL);

        outChars = LE_NEW_ARRAY(LEUnicode, outCharCount);
        for (i = 0; i < outCharCount; i += 1) {
            outChars[i] = (LEUnicode) LE_GET_GLYPH(glyphStorage[i]);
        }

        delete substitutionFilter;
    }

    return outCharCount;
}