82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
#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 Globe(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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string type = obj.Get("type").As<Napi::String>().Utf8Value();
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string basePath = obj.Get("basePath").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()) 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 = type == "gif" ? vips_image_get_n_pages(in.get_image()) : 29;
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double size = min(width, page_height);
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string diffPath = basePath + "assets/images/globediffuse.png";
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VImage diffuse =
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VImage::new_from_file(diffPath.c_str()).resize(size / 500.0) / 255;
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string specPath = basePath + "assets/images/globespec.png";
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VImage specular =
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VImage::new_from_file(specPath.c_str()).resize(size / 500.0);
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string distortPath = basePath + "assets/images/spheremap.png";
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VImage distort =
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(VImage::new_from_file(distortPath.c_str()).resize(size / 500.0) /
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255) *
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size;
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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 =
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type == "gif" ? in.crop(0, i * page_height, width, page_height) : in;
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VImage resized = img_frame.resize(
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size / (double)width,
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VImage::option()->set("vscale", size / (double)page_height));
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VImage rolled = resized.wrap(
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VImage::option()->set("x", page_height * i / n_pages)->set("y", 0));
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VImage extracted = rolled.extract_band(0, VImage::option()->set("n", 3));
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VImage mapped = extracted.mapim(distort);
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VImage composited = mapped * diffuse + specular;
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VImage frame = composited.bandjoin(diffuse > 0.0);
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img.push_back(frame);
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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 (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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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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} |