C++ (Cpp) PremultipliedImage::bytes Examples

Example #1

File: premultiply.cpp Project: akikoskinen/mapbox-gl-native

PremultipliedImage premultiply(UnassociatedImage&& src) {
    PremultipliedImage dst;

    dst.size = src.size;
    dst.data = std::move(src.data);

    uint8_t* data = dst.data.get();
    for (size_t i = 0; i < dst.bytes(); i += 4) {
        uint8_t& r = data[i + 0];
        uint8_t& g = data[i + 1];
        uint8_t& b = data[i + 2];
        uint8_t& a = data[i + 3];
        r = (r * a + 127) / 255;
        g = (g * a + 127) / 255;
        b = (b * a + 127) / 255;
    }

    return dst;
}