pub unsafe extern "C" fn C_SkImageFilters_MatrixConvolution(
    kernelSize: *const SkISize,
    kernel: *const SkScalar,
    gain: SkScalar,
    bias: SkScalar,
    kernelOffset: *const SkIPoint,
    tileMode: SkTileMode,
    convolveAlpha: bool,
    input: *mut SkImageFilter,
    cropRect: *const SkImageFilters_CropRect
) -> *mut SkImageFilter