C++ SkTArray::front方法代码示例

GrPathRange* GrGLPathRendering::createGlyphs(const SkTypeface* typeface,
                                             const SkDescriptor* desc,
                                             const SkStrokeRec& stroke) {
    if (NULL != desc || !caps().glyphLoadingSupport) {
        return GrPathRendering::createGlyphs(typeface, desc, stroke);
    }

    if (NULL == typeface) {
        typeface = SkTypeface::GetDefaultTypeface();
        SkASSERT(NULL != typeface);
    }

    int faceIndex;
    SkAutoTDelete<SkStream> fontStream(typeface->openStream(&faceIndex));

    const size_t fontDataLength = fontStream->getLength();
    if (0 == fontDataLength) {
        return GrPathRendering::createGlyphs(typeface, NULL, stroke);
    }

    SkTArray<uint8_t> fontTempBuffer;
    const void* fontData = fontStream->getMemoryBase();
    if (NULL == fontData) {
        // TODO: Find a more efficient way to pass the font data (e.g. open file descriptor).
        fontTempBuffer.reset(SkToInt(fontDataLength));
        fontStream->read(&fontTempBuffer.front(), fontDataLength);
        fontData = &fontTempBuffer.front();
    }

    const int numPaths = typeface->countGlyphs();
    const GrGLuint basePathID = this->genPaths(numPaths);
    SkAutoTUnref<GrGLPath> templatePath(SkNEW_ARGS(GrGLPath, (fGpu, SkPath(), stroke)));

    GrGLenum status;
    GL_CALL_RET(status, PathMemoryGlyphIndexArray(basePathID, GR_GL_STANDARD_FONT_FORMAT,
                                                  fontDataLength, fontData, faceIndex, 0,
                                                  numPaths, templatePath->pathID(),
                                                  SkPaint::kCanonicalTextSizeForPaths));

    if (GR_GL_FONT_GLYPHS_AVAILABLE != status) {
        this->deletePaths(basePathID, numPaths);
        return GrPathRendering::createGlyphs(typeface, NULL, stroke);
    }

    // This is a crude approximation. We may want to consider giving this class
    // a pseudo PathGenerator whose sole purpose is to track the approximate gpu
    // memory size.
    const size_t gpuMemorySize = fontDataLength / 4;
    return SkNEW_ARGS(GrGLPathRange, (fGpu, basePathID, numPaths, gpuMemorySize, stroke));
}

// finds the index of ext in strings or a negative result if ext is not found.
static int find_string(const SkTArray<SkString>& strings, const char ext[]) {
    if (strings.empty()) {
        return -1;
    }
    SkString extensionStr(ext);
    int idx = SkTSearch<SkString, extension_compare>(&strings.front(),
                                                     strings.count(),
                                                     extensionStr,
                                                     sizeof(SkString));
    return idx;
}