mrmBot-Matrix/natives/watermark.cc

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#include <Magick++.h>
#include <napi.h>
#include <iostream>
#include <list>
using namespace std;
using namespace Magick;
Magick::GravityType NapiToGravity(const Napi::Value gravity) {
Magick::GravityType g = Magick::GravityType();
if (gravity.IsNumber()) {
return Magick::GravityType(gravity.As<Napi::Number>().Int64Value());
}else if (gravity.IsString()) {
string grav = gravity.As<Napi::String>().Utf8Value();
if (grav == "northwest") {
g = Magick::NorthWestGravity;
} else if (grav == "north") {
g = Magick::NorthGravity;
} else if (grav == "northeast") {
g = Magick::NorthEastGravity;
} else if (grav == "west") {
g = Magick::WestGravity;
} else if (grav == "center") {
g = Magick::CenterGravity;
} else if (grav == "east") {
g = Magick::EastGravity;
} else if (grav == "southwest") {
g = Magick::SouthWestGravity;
} else if (grav == "south") {
g = Magick::SouthGravity;
} else if (grav == "southeast") {
g = Magick::SouthEastGravity;
} else if (grav == "forget") {
g = Magick::ForgetGravity;
} else if (grav == "north_east") {
g = Magick::NorthEastGravity;
} else if (grav == "north_west") {
g = Magick::NorthWestGravity;
} else if (grav == "south_east") {
g = Magick::SouthEastGravity;
} else if (grav == "south_west") {
g = Magick::SouthWestGravity;
} else {
g = Magick::CenterGravity;
}
}
return g;
}
Napi::Value Watermark(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 water = obj.Get("water").As<Napi::String>().Utf8Value();
Magick::GravityType gravity = NapiToGravity(obj.Get("gravity"));
bool resize = obj.Has("resize")
? obj.Get("resize").As<Napi::Boolean>().Value()
: false;
float yscale = obj.Has("yscale")
? obj.Get("yscale").As<Napi::Number>().FloatValue() : false;
bool append = obj.Has("append")
? obj.Get("append").As<Napi::Boolean>().Value()
: false;
bool mc = obj.Has("mc") ? obj.Get("mc").As<Napi::Boolean>().Value() : false;
string type = obj.Get("type").As<Napi::String>().Utf8Value();
int delay =
obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
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Blob blob;
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list<Image> frames;
list<Image> coalesced;
list<Image> mid;
Image watermark;
try {
readImages(&frames, Blob(data.Data(), data.Length()));
} catch (Magick::WarningCoder &warning) {
cerr << "Coder Warning: " << warning.what() << endl;
} catch (Magick::Warning &warning) {
cerr << "Warning: " << warning.what() << endl;
}
watermark.read(water);
if (resize && append) {
string query(to_string(frames.front().baseColumns()) + "x");
watermark.scale(Geometry(query));
} else if (resize&&yscale) {
string query(to_string(frames.front().baseColumns())+"x"+to_string(frames.front().baseRows()*yscale)+"!");
watermark.resize(Geometry(query));
} else if (resize) {
string query("x"+to_string(frames.front().baseRows()));
watermark.scale(Geometry(query));
}
coalesceImages(&coalesced, frames.begin(), frames.end());
for (Image &image : coalesced) {
Image final;
if (append) {
list<Image> to_append;
to_append.push_back(image);
to_append.push_back(watermark);
appendImages(&final, to_append.begin(), to_append.end(), true);
final.repage();
} else if (mc) {
image.backgroundColor("white");
image.extent(Geometry(image.columns(), image.rows() + 15));
image.composite(watermark, gravity,
Magick::OverCompositeOp);
final = image;
} else {
image.composite(watermark, gravity,
Magick::OverCompositeOp);
final = image;
}
image.magick(type);
final.animationDelay(delay == 0 ? image.animationDelay() : delay);
mid.push_back(final);
}
optimizeTransparency(mid.begin(), mid.end());
if (type == "gif") {
for (Image &image : mid) {
image.quantizeDitherMethod(FloydSteinbergDitherMethod);
image.quantize();
}
}
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");
}
}