C++ LEGlyphStorage::adoptGlyphCount方法代码示例

// 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;
}

le_int32 OpenTypeLayoutEngine::glyphPostProcessing(LEGlyphStorage &tempGlyphStorage, LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    glyphStorage.adoptGlyphArray(tempGlyphStorage);
    glyphStorage.adoptCharIndicesArray(tempGlyphStorage);
    glyphStorage.adoptAuxDataArray(tempGlyphStorage);
    glyphStorage.adoptGlyphCount(tempGlyphStorage);

    return glyphStorage.getGlyphCount();
}

// Input: characters
// Output: characters, char indices, tags
// Returns: output character count
le_int32 IndicOpenTypeLayoutEngine::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;
    }

    le_int32 worstCase = count * IndicReordering::getWorstCaseExpansion(fScriptCode);

    outChars = LE_NEW_ARRAY(LEUnicode, worstCase);

    if (outChars == NULL) {
        success = LE_MEMORY_ALLOCATION_ERROR;
        return 0;
    }

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

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

    // NOTE: assumes this allocates featureTags...
    // (probably better than doing the worst case stuff here...)

    le_int32 outCharCount;
    if (fVersion2) {
        outCharCount = IndicReordering::v2process(&chars[offset], count, fScriptCode, outChars, glyphStorage);
    } else {
        outCharCount = IndicReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage, &fMPreFixups, success);
    }

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

    glyphStorage.adoptGlyphCount(outCharCount);
    return outCharCount;
}

// Input: characters (0..max provided for context)
// Output: glyphs, char indices
// Returns: the glyph count
// NOTE: this assumes that ThaiShaping::compose will allocate the outChars array...
le_int32 ThaiLayoutEngine::computeGlyphs(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;
    }

    LEUnicode *outChars;
    le_int32 glyphCount;
    
    // This is enough room for the worst-case expansion
    // (it says here...)
    outChars = LE_NEW_ARRAY(LEUnicode, count * 2);

    if (outChars == NULL) {
        success = LE_MEMORY_ALLOCATION_ERROR;
        return 0;
    }

    glyphStorage.allocateGlyphArray(count * 2, FALSE, success);

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

    glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, glyphStorage);
    mapCharsToGlyphs(outChars, 0, glyphCount, FALSE, FALSE, glyphStorage, success);

    LE_DELETE_ARRAY(outChars);

    glyphStorage.adoptGlyphCount(glyphCount);
    return glyphCount;
}

// Input: characters
// Output: characters, char indices, tags
// Returns: output character count
le_int32 TibetanOpenTypeLayoutEngine::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;
    }

    le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough

    outChars = LE_NEW_ARRAY(LEUnicode, worstCase);

    if (outChars == NULL) {
        success = LE_MEMORY_ALLOCATION_ERROR;
        return 0;
    }

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

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

    // NOTE: assumes this allocates featureTags...
    // (probably better than doing the worst case stuff here...)
    le_int32 outCharCount = TibetanReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);

    glyphStorage.adoptGlyphCount(outCharCount);
    return outCharCount;
}

//.........这里部分代码省略.........

    le_int32 outCharCount = 0;
    le_int32 limit = offset + count;
    le_int32 i = offset;

    while (i < limit) {
        le_int32 state    = 0;
        le_int32 inStart  = i;
        le_int32 outStart = outCharCount;

        while( i < limit) {
            LEUnicode lead  = 0;
            LEUnicode vowel = 0;
            LEUnicode trail = 0;
            int32_t chClass = getCharClass(chars[i], lead, vowel, trail);
            const StateTransition transition = stateTable[state][chClass];

            if (chClass == CC_X) {
                /* Any character of type X will be stored as a trail jamo */
                if ((transition.actionFlags & AF_T) != 0) {
                    outChars[outCharCount] = trail;
                    glyphStorage.setCharIndex(outCharCount, i-offset, success);
                    glyphStorage.setAuxData(outCharCount++, nullFeatures, success);
                }
            } else {
                /* Any Hangul will be fully decomposed. Output the decomposed characters. */
                if ((transition.actionFlags & AF_L) != 0) {
                    outChars[outCharCount] = lead;
                    glyphStorage.setCharIndex(outCharCount, i-offset, success);
                    glyphStorage.setAuxData(outCharCount++, ljmoFeatures, success);
                }

                if ((transition.actionFlags & AF_V) != 0) {
                    outChars[outCharCount] = vowel;
                    glyphStorage.setCharIndex(outCharCount, i-offset, success);
                    glyphStorage.setAuxData(outCharCount++, vjmoFeatures, success);
                }

                if ((transition.actionFlags & AF_T) != 0) {
                    outChars[outCharCount] = trail;
                    glyphStorage.setCharIndex(outCharCount, i-offset, success);
                    glyphStorage.setAuxData(outCharCount++, tjmoFeatures, success);
                }
            }

            state = transition.newState;

            /* Negative next state means stop. */
            if (state < 0) {
                break;
            }

            i += 1;
        }

        le_int32 inLength  = i - inStart;
        le_int32 outLength = outCharCount - outStart;

        /*
         * See if the syllable can be composed into a single character. There are 5
         * possible cases:
         *
         *   Input     Decomposed to    Compose to
         *   LV        L, V             LV
         *   LVT       L, V, T          LVT
         *   L, V      L, V             LV, DEL
         *   LV, T     L, V, T          LVT, DEL
         *   L, V, T   L, V, T          LVT, DEL, DEL
         */
        if ((inLength >= 1 && inLength <= 3) && (outLength == 2 || outLength == 3)) {
            LEUnicode syllable = 0x0000;
            LEUnicode lead  = outChars[outStart];
            LEUnicode vowel = outChars[outStart + 1];
            LEUnicode trail = outLength == 3? outChars[outStart + 2] : TJMO_FIRST;

            /*
             * If the composition consumes the whole decomposed syllable,
             * we can use it.
             */
            if (compose(lead, vowel, trail, syllable) == outLength) {
                outCharCount = outStart;
                outChars[outCharCount] = syllable;
                glyphStorage.setCharIndex(outCharCount, inStart-offset, success);
                glyphStorage.setAuxData(outCharCount++, nullFeatures, success);

                /*
                 * Replace the rest of the input characters with DEL.
                 */
                for(le_int32 d = inStart + 1; d < i; d += 1) {
                    outChars[outCharCount] = 0xFFFF;
                    glyphStorage.setCharIndex(outCharCount, d - offset, success);
                    glyphStorage.setAuxData(outCharCount++, nullFeatures, success);
                }
            }
        }
    }

    glyphStorage.adoptGlyphCount(outCharCount);
    return outCharCount;
}