60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
#include <map>
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#include <string>
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#include <vips/vips8>
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#include "common.h"
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using namespace std;
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using namespace vips;
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char *Flag(string *type, char *BufferData, size_t BufferLength,
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ArgumentMap Arguments, size_t *DataSize) {
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string overlay = GetArgument<string>(Arguments, "overlay");
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string basePath = GetArgument<string>(Arguments, "basePath");
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in =
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VImage::new_from_buffer(BufferData, BufferLength, "",
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*type == "gif" ? options->set("n", -1) : options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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if (!in.has_alpha()) in = in.bandjoin(255);
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int width = in.width();
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int pageHeight = vips_image_get_page_height(in.get_image());
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int nPages = vips_image_get_n_pages(in.get_image());
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string assetPath = basePath + overlay;
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VImage overlayInput = VImage::new_from_file(assetPath.c_str());
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VImage overlayImage = overlayInput.resize(
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(double)width / (double)overlayInput.width(),
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VImage::option()->set(
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"vscale", (double)pageHeight / (double)overlayInput.height()));
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if (!overlayImage.has_alpha()) {
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overlayImage = overlayImage.bandjoin(127);
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} else {
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// this is a pretty cool line, just saying
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overlayImage = overlayImage * vector<double>{1, 1, 1, 0.5};
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}
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vector<VImage> img;
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for (int i = 0; i < nPages; i++) {
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VImage img_frame =
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*type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
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VImage composited =
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img_frame.composite2(overlayImage, VIPS_BLEND_MODE_OVER);
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img.push_back(composited);
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}
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VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
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final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
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void *buf;
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final.write_to_buffer(
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("." + *type).c_str(), &buf, DataSize,
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*type == "gif" ? VImage::option()->set("dither", 0)->set("reoptimise", 1)
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: 0);
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return (char *)buf;
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} |