Function downscale

src/fl/gfx/downscale.cpp.hpp:155–185

}

void downscale(const CRGB *src, const XYMap &srcXY, CRGB *dst,
               const XYMap &dstXY) {
    fl::u16 srcWidth = srcXY.getWidth();
    fl::u16 srcHeight = srcXY.getHeight();
    fl::u16 dstWidth = dstXY.getWidth();
    fl::u16 dstHeight = dstXY.getHeight();

    FASTLED_ASSERT(dstWidth <= srcWidth,
                   "Destination width must be <= source width");
    FASTLED_ASSERT(dstHeight <= srcHeight,
                   "Destination height must be <= source height");
    const bool destination_is_half_of_source =
        (dstWidth * 2 == srcWidth) && (dstHeight * 2 == srcHeight);
    // Attempt to use the downscaleHalf function if the destination is half the
    // size of the source.
    if (destination_is_half_of_source) {
        const bool both_rectangles = (srcXY.getType() == XYMap::kLineByLine) &&
                                     (dstXY.getType() == XYMap::kLineByLine);
        if (both_rectangles) {
            // If both source and destination are rectangular, we can use the
            // optimized version
            downscaleHalf(src, srcWidth, srcHeight, dst);
        } else {
            // Otherwise, we need to use the mapped version
            downscaleHalf(src, srcXY, dst, dstXY);
        }
        return;
    }

    downscaleArbitrary(src, srcXY, dst, dstXY);
}

} // namespace fl