Method loadFromMemory

dgl/src/Cairo.cpp:404–508

}

void CairoImage::loadFromMemory(const char* const rdata, const Size<uint>& s, const ImageFormat fmt) noexcept
{
    const cairo_format_t cairoformat = asCairoImageFormat(fmt);
    DISTRHO_SAFE_ASSERT_RETURN(cairoformat != CAIRO_FORMAT_INVALID,);

    const int width  = static_cast<int>(s.getWidth());
    const int height = static_cast<int>(s.getHeight());
    const int stride = cairo_format_stride_for_width(cairoformat, width);

    uchar* const newdata = static_cast<uchar*>(std::malloc(static_cast<size_t>(width * height * stride * 4)));
    DISTRHO_SAFE_ASSERT_RETURN(newdata != nullptr,);

    cairo_surface_t* const newsurface = cairo_image_surface_create_for_data(newdata, cairoformat, width, height, stride);
    DISTRHO_SAFE_ASSERT_RETURN(newsurface != nullptr,);
    DISTRHO_SAFE_ASSERT_RETURN(static_cast<int>(s.getWidth()) == cairo_image_surface_get_width(newsurface),);
    DISTRHO_SAFE_ASSERT_RETURN(static_cast<int>(s.getHeight()) == cairo_image_surface_get_height(newsurface),);

    cairo_surface_destroy(surface);

    if (datarefcount != nullptr && --(*datarefcount) == 0)
        std::free(surfacedata);
    else
        datarefcount = static_cast<int*>(std::malloc(sizeof(int)));

    surface = newsurface;
    surfacedata = newdata;
    *datarefcount = 1;

    const uchar* const urdata = reinterpret_cast<const uchar*>(rdata);

    switch (fmt)
    {
    case kImageFormatNull:
        break;
    case kImageFormatGrayscale:
        // Grayscale to CAIRO_FORMAT_RGB24
        for (int h = 0; h < height; ++h)
        {
            for (int w = 0; w < width; ++w)
            {
                newdata[h*width*4+w*4+0] = urdata[h*width+w];
                newdata[h*width*4+w*4+1] = urdata[h*width+w];
                newdata[h*width*4+w*4+2] = urdata[h*width+w];
                newdata[h*width*4+w*4+3] = 0;
            }
        }
        break;
    case kImageFormatBGR:
        // BGR8 to CAIRO_FORMAT_RGB24
        for (int h = 0; h < height; ++h)
        {
            for (int w = 0; w < width; ++w)
            {
                newdata[h*width*4+w*4+0] = urdata[h*width*3+w*3+0];
                newdata[h*width*4+w*4+1] = urdata[h*width*3+w*3+1];
                newdata[h*width*4+w*4+2] = urdata[h*width*3+w*3+2];
                newdata[h*width*4+w*4+3] = 0;
            }