mrmBot-Matrix/natives/flip.cc

52 lines
No EOL
1.6 KiB
C++

#include "common.h"
#include <map>
#include <vips/vips8>
using namespace std;
using namespace vips;
char *Flip(string type, char *BufferData, size_t BufferLength,
ArgumentMap Arguments, size_t *DataSize) {
bool flop = GetArgument<bool>(Arguments, "flop");
VImage in = VImage::new_from_buffer(BufferData, BufferLength, "",
type == "gif"
? VImage::option()->set("n", -1)->set(
"access", "sequential")
: 0)
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha())
in = in.bandjoin(255);
VImage out;
if (flop) {
out = in.flip(VIPS_DIRECTION_HORIZONTAL);
} else if (type == "gif") {
// libvips gif handling is both a blessing and a curse
vector<VImage> img;
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
for (int i = 0; i < nPages; i++) {
VImage img_frame = in.crop(0, i * pageHeight, in.width(), pageHeight);
VImage flipped = img_frame.flip(VIPS_DIRECTION_VERTICAL);
img.push_back(flipped);
}
out = VImage::arrayjoin(img, VImage::option()->set("across", 1));
out.set(VIPS_META_PAGE_HEIGHT, pageHeight);
} else {
out = in.flip(VIPS_DIRECTION_VERTICAL);
}
void *buf;
out.write_to_buffer(
("." + type).c_str(), &buf, DataSize,
type == "gif" ? VImage::option()->set("dither", 0)->set("reoptimise", 1)
: 0);
vips_error_clear();
vips_thread_shutdown();
return (char *)buf;
}