67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
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#include <math.h>
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#include <napi.h>
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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 Squish(const Napi::CallbackInfo &info) {
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Napi::Env env = info.Env();
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Napi::Object result = Napi::Object::New(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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string type = obj.Get("type").As<Napi::String>().Utf8Value();
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VOption *options = VImage::option();
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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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type == "gif" ? options->set("n", -1)->set("access", "sequential")
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: options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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if (!in.has_alpha())
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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 = type == "gif" ? vips_image_get_n_pages(in.get_image()) : 30;
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double mult = (2 * M_PI) / nPages;
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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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double newWidth = (sin(i * mult) / 4) + 0.75;
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double newHeight = (cos(i * mult) / 4) + 0.75;
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VImage resized =
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img_frame.resize(newWidth, VImage::option()->set("vscale", newHeight))
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.gravity(VIPS_COMPASS_DIRECTION_CENTRE, width, pageHeight);
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img.push_back(resized);
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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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if (type != "gif") {
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vector<int> delay(30, 50);
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final.set("delay", delay);
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}
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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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result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
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result.Set("type", "gif");
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} catch (std::exception const &err) {
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Napi::Error::New(env, err.what()).ThrowAsJavaScriptException();
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} catch (...) {
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Napi::Error::New(env, "Unknown error").ThrowAsJavaScriptException();
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}
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vips_error_clear();
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vips_thread_shutdown();
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return result;
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}
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