mrmBot-Matrix/natives/flag.cc

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#include "common.h"
#include <map>
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#include <string>
#include <vips/vips8>
using namespace std;
using namespace vips;
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char *Flag(string type, char *BufferData, size_t BufferLength,
ArgumentMap Arguments, size_t *DataSize) {
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string overlay = GetArgument<string>(Arguments, "overlay");
string basePath = GetArgument<string>(Arguments, "basePath");
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in =
VImage::new_from_buffer(BufferData, BufferLength, "",
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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};
}
vector<VImage> img;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
VImage composited =
img_frame.composite2(overlayImage, VIPS_BLEND_MODE_OVER);
img.push_back(composited);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
void *buf;
final.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;
}