mrmBot-Matrix/natives/invert.cc

28 lines
886 B
C++
Raw Normal View History

2023-03-15 14:09:09 +00:00
#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
char *Invert(string type, string *outType, char *BufferData,
size_t BufferLength, [[maybe_unused]] ArgumentMap Arguments,
size_t *DataSize) {
VOption *options = VImage::option()->set("access", "sequential");
VImage in =
VImage::new_from_buffer(BufferData, BufferLength, "",
type == "gif" ? options->set("n", -1) : options)
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha()) in = in.bandjoin(255);
VImage noAlpha =
in.extract_band(0, VImage::option()->set("n", in.bands() - 1));
VImage inverted = noAlpha.invert();
VImage out = inverted.bandjoin(in.extract_band(3));
void *buf;
out.write_to_buffer(("." + *outType).c_str(), &buf, DataSize);
return (char *)buf;
}