mrmBot-Matrix/natives/uncaption.cc

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#include <Magick++.h>
#include <napi.h>
#include <iostream>
#include <list>
#include <string_view>
using namespace std;
using namespace Magick;
template <typename T>
constexpr auto type_name() noexcept {
std::string_view name = "Error: unsupported compiler", prefix, suffix;
#ifdef __clang__
name = __PRETTY_FUNCTION__;
prefix = "auto type_name() [T = ";
suffix = "]";
#elif defined(__GNUC__)
name = __PRETTY_FUNCTION__;
prefix = "constexpr auto type_name() [with T = ";
suffix = "]";
#elif defined(_MSC_VER)
name = __FUNCSIG__;
prefix = "auto __cdecl type_name<";
suffix = ">(void) noexcept";
#endif
name.remove_prefix(prefix.size());
name.remove_suffix(suffix.size());
return name;
}
Napi::Value Uncaption(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
try {
Napi::Object obj = info[0].As<Napi::Object>();
Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
string type = obj.Get("type").As<Napi::String>().Utf8Value();
int delay =
obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
Blob blob;
list<Image> frames;
list<Image> coalesced;
list<Image> mid;
readImages(&frames, Blob(data.Data(), data.Length()));
coalesceImages(&coalesced, frames.begin(), frames.end());
Image firstImage = coalesced.front();
ssize_t columns = firstImage.columns();
ssize_t rows = firstImage.rows();
//ssize_t column;
ssize_t row;
//bool found = false;
for (row = 0; row < rows; ++row) {
//for (column = 0; column < columns; ++column) {
ColorGray color = firstImage.pixelColor(0, row);
if (color.shade() < 0.9765625) {
//found = true;
break;
}
//}
//if (found) break;
}
Geometry geom = Geometry(columns, row == rows ? rows : rows - row, 0,
row == rows ? 0 : row);
for (Image &image : coalesced) {
image.virtualPixelMethod(Magick::TransparentVirtualPixelMethod);
image.backgroundColor("none");
image.extent(geom);
image.magick(type);
mid.push_back(image);
}
optimizeTransparency(mid.begin(), mid.end());
if (type == "gif") {
for (Image &image : mid) {
image.quantizeDither(false);
image.quantize();
if (delay != 0) image.animationDelay(delay);
}
}
writeImages(mid.begin(), mid.end(), &blob);
Napi::Object result = Napi::Object::New(env);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
blob.length()));
result.Set("type", type);
return result;
} catch (std::exception const &err) {
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}