mrmBot-Matrix/natives/sonic.cc

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#include <napi.h>
#include <vips/vips8>
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using namespace std;
using namespace vips;
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Napi::Value Sonic(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 {
Napi::Object obj = info[0].As<Napi::Object>();
string text = obj.Get("text").As<Napi::String>().Utf8Value();
string basePath = obj.Get("basePath").As<Napi::String>().Utf8Value();
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string assetPath = basePath + "assets/images/sonic.jpg";
VImage bg = VImage::new_from_file(assetPath.c_str());
VImage textImage =
VImage::text(("<span foreground=\"white\">" + text + "</span>").c_str(),
VImage::option()
->set("rgba", true)
->set("align", VIPS_ALIGN_CENTRE)
->set("font", "Bitstream Vera Sans")
->set("width", 542)
->set("height", 390))
.gravity(VIPS_COMPASS_DIRECTION_CENTRE, 542, 390);
VImage out = bg.composite2(textImage, VIPS_BLEND_MODE_OVER,
VImage::option()->set("x", 391)->set("y", 84));
void *buf;
size_t length;
out.write_to_buffer(".png", &buf, &length);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
result.Set("type", "png");
} catch (std::exception const &err) {
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Napi::Error::New(env, err.what()).ThrowAsJavaScriptException();
} catch (...) {
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Napi::Error::New(env, "Unknown error").ThrowAsJavaScriptException();
}
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vips_error_clear();
vips_thread_shutdown();
return result;
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}