void Png::PngEncodeAsync(const FunctionCallbackInfo<Value> &args)
{
Isolate *isolate = Isolate::GetCurrent();
HandleScope scope(isolate);
if (args.Length() != 1) {
args.GetReturnValue().Set(VException("One argument required - callback function."));
return;
}
if (!args[0]->IsFunction()) {
args.GetReturnValue().Set(VException("First argument must be a function."));
return;
}
Local<Function> callback = Local<Function>::Cast(args[0]);
Png *png = ObjectWrap::Unwrap<Png>(args.This());
encode_request *enc_req = (encode_request *)malloc(sizeof(*enc_req));
if (!enc_req) {
args.GetReturnValue().Set(VException("malloc in Png::PngEncodeAsync failed."));
return;
}
enc_req->callback.Reset(isolate, callback);
enc_req->png_obj = png;
enc_req->png = NULL;
enc_req->png_len = 0;
enc_req->error = NULL;
// We need to pull out the buffer data before
// we go to the thread pool.
Local<Value> buf_val = png->handle()->GetHiddenValue(String::NewFromUtf8(isolate, "buffer"));
enc_req->buf_data = Buffer::Data(buf_val->ToObject());
uv_work_t* req = new uv_work_t;
req->data = enc_req;
uv_queue_work(uv_default_loop(), req, UV_PngEncode, (uv_after_work_cb)UV_PngEncodeAfter);
png->Ref();
}
void
Png::New(const FunctionCallbackInfo<Value> &args)
{
Isolate *isolate = Isolate::GetCurrent();
HandleScope scope(isolate);
if (args.Length() < 3)
args.GetReturnValue().Set(VException("At least three arguments required - data buffer, width, height, [and input buffer type]"));
if (!Buffer::HasInstance(args[0]))
args.GetReturnValue().Set(VException("First argument must be Buffer."));
if (!args[1]->IsInt32())
args.GetReturnValue().Set(VException("Second argument must be integer width."));
if (!args[2]->IsInt32())
args.GetReturnValue().Set(VException("Third argument must be integer height."));
buffer_type buf_type = BUF_RGB;
if (args.Length() >= 4) {
if (!args[3]->IsString())
args.GetReturnValue().Set(VException("Fourth argument must be 'gray', 'rgb', 'bgr', 'rgba' or 'bgra'."));
String::Utf8Value bts(args[3]->ToString());
if (!(str_eq(*bts, "rgb") || str_eq(*bts, "bgr") ||
str_eq(*bts, "rgba") || str_eq(*bts, "bgra") ||
str_eq(*bts, "gray")))
{
args.GetReturnValue().Set(VException("Fourth argument must be 'gray', 'rgb', 'bgr', 'rgba' or 'bgra'."));
}
if (str_eq(*bts, "rgb"))
buf_type = BUF_RGB;
else if (str_eq(*bts, "bgr"))
buf_type = BUF_BGR;
else if (str_eq(*bts, "rgba"))
buf_type = BUF_RGBA;
else if (str_eq(*bts, "bgra"))
buf_type = BUF_BGRA;
else if (str_eq(*bts, "gray"))
buf_type = BUF_GRAY;
else
args.GetReturnValue().Set(VException("Fourth argument wasn't 'gray', 'rgb', 'bgr', 'rgba' or 'bgra'."));
}
int bits = 8;
if (args.Length() >= 5) {
if(buf_type != BUF_GRAY)
args.GetReturnValue().Set(VException("Pixel bit width option only valid for \"gray\" buffer type"));
if(!args[4]->IsInt32())
args.GetReturnValue().Set(VException("Fifth argument must be 8 or 16"));
if(args[4]->Int32Value() == 8)
bits = 8;
else if (args[4]->Int32Value() == 16)
bits = 16;
else
args.GetReturnValue().Set(VException("Fifth arguments wasn't 8 or 16"));
}
int w = args[1]->Int32Value();
int h = args[2]->Int32Value();
if (w < 0)
args.GetReturnValue().Set(VException("Width smaller than 0."));
if (h < 0)
args.GetReturnValue().Set(VException("Height smaller than 0."));
Png *png = new Png(w, h, buf_type, bits);
png->Wrap(args.This());
// Save buffer.
png->handle()->SetHiddenValue(String::NewFromUtf8(isolate, "buffer"), args[0]);
args.GetReturnValue().Set(args.This());
}