73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
#include <napi.h>
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#include <iostream>
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#include <list>
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#include <vips/vips8>
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using namespace std;
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using namespace vips;
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Napi::Value Reverse(const Napi::CallbackInfo &info) {
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Napi::Env env = info.Env();
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try {
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Napi::Object obj = info[0].As<Napi::Object>();
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Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
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bool soos =
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obj.Has("soos") ? obj.Get("soos").As<Napi::Boolean>().Value() : false;
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VOption *options =
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VImage::option()->set("access", "sequential")->set("n", -1);
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VImage in = VImage::new_from_buffer(data.Data(), data.Length(), "", options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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int width = in.width();
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int page_height = vips_image_get_page_height(in.get_image());
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int n_pages = vips_image_get_n_pages(in.get_image());
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vector<VImage> split;
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// todo: find a better way of getting individual frames (or at least getting the frames in reverse order)
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for (int i = 0; i < n_pages; i++) {
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VImage img_frame = in.crop(0, i * page_height, width, page_height);
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split.push_back(img_frame);
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}
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vector<int> delays = in.get_array_int("delay");
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if (soos) {
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vector<VImage> copy = split;
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vector<int> copy2 = delays;
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reverse(copy.begin(), copy.end());
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reverse(copy2.begin(), copy2.end());
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copy.pop_back();
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copy2.pop_back();
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copy.erase(copy.begin());
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copy2.erase(copy2.begin());
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split.insert(split.end(), copy.begin(), copy.end());
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delays.insert(delays.end(), copy2.begin(), copy2.end());
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} else {
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reverse(split.begin(), split.end());
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reverse(delays.begin(), delays.end());
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}
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VImage final = VImage::arrayjoin(split, VImage::option()->set("across", 1));
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final.set(VIPS_META_PAGE_HEIGHT, page_height);
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final.set("delay", delays);
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void *buf;
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size_t length;
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final.write_to_buffer(".gif", &buf, &length,
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VImage::option()->set("dither", 0));
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vips_thread_shutdown();
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Napi::Object result = Napi::Object::New(env);
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result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
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result.Set("type", "gif");
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return result;
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} catch (std::exception const &err) {
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throw Napi::Error::New(env, err.what());
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} catch (...) {
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throw Napi::Error::New(env, "Unknown error");
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}
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} |