81 lines
2.6 KiB
C++
81 lines
2.6 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 Jpeg(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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int quality = obj.Has("quality")
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? obj.Get("quality").As<Napi::Number>().Int32Value()
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: 0;
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string type = obj.Get("type").As<Napi::String>().Utf8Value();
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int delay =
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obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
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Napi::Object result = Napi::Object::New(env);
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if (type == "gif") {
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VImage in =
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VImage::new_from_buffer(
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data.Data(), data.Length(), "",
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VImage::option()->set("access", "sequential")->set("n", -1))
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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 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> img;
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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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void *buf;
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size_t length;
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img_frame.write_to_buffer(
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".jpg", &buf, &length,
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VImage::option()->set("Q", quality)->set("strip", true));
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VImage jpeg = VImage::new_from_buffer(buf, length, "");
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img.push_back(jpeg);
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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, page_height);
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if (delay) final.set("delay", delay);
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void *buf;
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size_t length;
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final.write_to_buffer(("." + type).c_str(), &buf, &length,
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VImage::option()->set("dither", 0));
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vips_thread_shutdown();
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result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
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result.Set("type", type);
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} else {
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VImage in = VImage::new_from_buffer(data.Data(), data.Length(), "");
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void *buf;
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size_t length;
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in.write_to_buffer(
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".jpg", &buf, &length,
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VImage::option()->set("Q", quality)->set("strip", true));
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vips_thread_shutdown();
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result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
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result.Set("type", "jpg");
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}
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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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}
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