51 lines
1.5 KiB
C++
51 lines
1.5 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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VImage sepia = VImage::new_matrixv(3, 3, 0.3588, 0.7044, 0.1368, 0.2990, 0.5870,
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0.1140, 0.2392, 0.4696, 0.0912);
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Napi::Value Colors(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 color = obj.Get("color").As<Napi::String>().Utf8Value();
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string type = obj.Get("type").As<Napi::String>().Utf8Value();
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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(data.Data(), data.Length(), "",
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type == "gif" ? options->set("n", -1) : options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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VImage out;
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if (color == "grayscale") {
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out = in.colourspace(VIPS_INTERPRETATION_B_W);
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} else if (color == "sepia") {
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out = in.flatten().recomb(sepia);
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}
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void *buf;
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size_t length;
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out.write_to_buffer(("." + type).c_str(), &buf, &length);
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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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} 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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