mrmBot-Matrix/natives/flag.cc

48 lines
No EOL
1.6 KiB
C++

#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
char *Flag(string *type, char *BufferData, size_t BufferLength,
ArgumentMap Arguments, size_t *DataSize) {
string overlay = GetArgument<string>(Arguments, "overlay");
string basePath = GetArgument<string>(Arguments, "basePath");
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);
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
string assetPath = basePath + overlay;
VImage overlayInput = VImage::new_from_file(assetPath.c_str());
VImage overlayImage = overlayInput.resize(
(double)width / (double)overlayInput.width(),
VImage::option()->set(
"vscale", (double)pageHeight / (double)overlayInput.height()));
if (!overlayImage.has_alpha()) {
overlayImage = overlayImage.bandjoin(127);
} else {
// this is a pretty cool line, just saying
overlayImage = overlayImage * vector<double>{1, 1, 1, 0.5};
}
VImage replicated = overlayImage.replicate(1, nPages);
VImage final = in.composite2(replicated, VIPS_BLEND_MODE_OVER);
void *buf;
final.write_to_buffer(
("." + *type).c_str(), &buf, DataSize,
*type == "gif" ? VImage::option()->set("dither", 0)->set("reoptimise", 1)
: 0);
return (char *)buf;
}