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jpeg.cpp
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jpeg.cpp
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#include <node.h>
#include <node_buffer.h>
#include <jpeglib.h>
#include <cstdlib>
#include <cstring>
#include "common.h"
#include "jpeg.h"
#include "jpeg_encoder.h"
#include "buffer_compat.h"
using namespace v8;
using namespace node;
void
Jpeg::Initialize(v8::Handle<v8::Object> target)
{
HandleScope scope;
Local<FunctionTemplate> t = FunctionTemplate::New(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
NODE_SET_PROTOTYPE_METHOD(t, "encode", JpegEncodeAsync);
NODE_SET_PROTOTYPE_METHOD(t, "encodeSync", JpegEncodeSync);
NODE_SET_PROTOTYPE_METHOD(t, "setQuality", SetQuality);
target->Set(String::NewSymbol("Jpeg"), t->GetFunction());
}
Jpeg::Jpeg(Buffer *ddata, int wwidth, int hheight, buffer_type bbuf_type) :
jpeg_encoder((unsigned char *)Buffer::Data(ddata), wwidth, hheight, 60, bbuf_type) {}
Handle<Value>
Jpeg::JpegEncodeSync()
{
HandleScope scope;
try {
jpeg_encoder.encode();
}
catch (const char *err) {
return VException(err);
}
int jpeg_len = jpeg_encoder.get_jpeg_len();
Buffer *retbuf = Buffer::New(jpeg_len);
memcpy(Buffer::Data(retbuf), jpeg_encoder.get_jpeg(), jpeg_len);
return scope.Close(retbuf->handle_);
}
void
Jpeg::SetQuality(int q)
{
jpeg_encoder.set_quality(q);
}
Handle<Value>
Jpeg::New(const Arguments &args)
{
HandleScope scope;
if (args.Length() < 3)
return VException("At least three arguments required - buffer, width, height, [and buffer type]");
if (!Buffer::HasInstance(args[0]))
return VException("First argument must be Buffer.");
if (!args[1]->IsInt32())
return VException("Second argument must be integer width.");
if (!args[2]->IsInt32())
return VException("Third argument must be integer height.");
int w = args[1]->Int32Value();
int h = args[2]->Int32Value();
if (w < 0)
return VException("Width can't be negative.");
if (h < 0)
return VException("Height can't be negative.");
buffer_type buf_type = BUF_RGB;
if (args.Length() == 4) {
if (!args[3]->IsString())
return VException("Fifth argument must be a string. Either 'rgb', 'bgr', 'rgba' or 'bgra'.");
String::AsciiValue bt(args[3]->ToString());
if (!(str_eq(*bt, "rgb") || str_eq(*bt, "bgr") ||
str_eq(*bt, "rgba") || str_eq(*bt, "bgra")))
{
return VException("Buffer type must be 'rgb', 'bgr', 'rgba' or 'bgra'.");
}
if (str_eq(*bt, "rgb"))
buf_type = BUF_RGB;
else if (str_eq(*bt, "bgr"))
buf_type = BUF_BGR;
else if (str_eq(*bt, "rgba"))
buf_type = BUF_RGBA;
else if (str_eq(*bt, "bgra"))
buf_type = BUF_BGRA;
else
return VException("Buffer type wasn't 'rgb', 'bgr', 'rgba' or 'bgra'.");
}
Buffer *data_buf = ObjectWrap::Unwrap<Buffer>(args[0]->ToObject());
Jpeg *jpeg = new Jpeg(data_buf, w, h, buf_type);
jpeg->Wrap(args.This());
return args.This();
}
Handle<Value>
Jpeg::JpegEncodeSync(const Arguments &args)
{
HandleScope scope;
Jpeg *jpeg = ObjectWrap::Unwrap<Jpeg>(args.This());
return scope.Close(jpeg->JpegEncodeSync());
}
Handle<Value>
Jpeg::SetQuality(const Arguments &args)
{
HandleScope scope;
if (args.Length() != 1)
return VException("One argument required - quality");
if (!args[0]->IsInt32())
return VException("First argument must be integer quality");
int q = args[0]->Int32Value();
if (q < 0)
return VException("Quality must be greater or equal to 0.");
if (q > 100)
return VException("Quality must be less than or equal to 100.");
Jpeg *jpeg = ObjectWrap::Unwrap<Jpeg>(args.This());
jpeg->SetQuality(q);
return Undefined();
}
void
Jpeg::EIO_JpegEncode(eio_req *req)
{
encode_request *enc_req = (encode_request *)req->data;
Jpeg *jpeg = (Jpeg *)enc_req->jpeg_obj;
try {
jpeg->jpeg_encoder.encode();
enc_req->jpeg_len = jpeg->jpeg_encoder.get_jpeg_len();
enc_req->jpeg = (char *)malloc(sizeof(*enc_req->jpeg)*enc_req->jpeg_len);
if (!enc_req->jpeg) {
enc_req->error = strdup("malloc in Jpeg::EIO_JpegEncode failed.");
return;
}
else {
memcpy(enc_req->jpeg, jpeg->jpeg_encoder.get_jpeg(), enc_req->jpeg_len);
}
}
catch (const char *err) {
enc_req->error = strdup(err);
}
}
int
Jpeg::EIO_JpegEncodeAfter(eio_req *req)
{
HandleScope scope;
ev_unref(EV_DEFAULT_UC);
encode_request *enc_req = (encode_request *)req->data;
Handle<Value> argv[2];
if (enc_req->error) {
argv[0] = Undefined();
argv[1] = ErrorException(enc_req->error);
}
else {
Buffer *buf = Buffer::New(enc_req->jpeg_len);
memcpy(Buffer::Data(buf), enc_req->jpeg, enc_req->jpeg_len);
argv[0] = buf->handle_;
argv[1] = Undefined();
}
TryCatch try_catch; // don't quite see the necessity of this
enc_req->callback->Call(Context::GetCurrent()->Global(), 2, argv);
if (try_catch.HasCaught())
FatalException(try_catch);
enc_req->callback.Dispose();
free(enc_req->jpeg);
free(enc_req->error);
((Jpeg *)enc_req->jpeg_obj)->Unref();
free(enc_req);
return 0;
}
Handle<Value>
Jpeg::JpegEncodeAsync(const Arguments &args)
{
HandleScope scope;
if (args.Length() != 1)
return VException("One argument required - callback function.");
if (!args[0]->IsFunction())
return VException("First argument must be a function.");
Local<Function> callback = Local<Function>::Cast(args[0]);
Jpeg *jpeg = ObjectWrap::Unwrap<Jpeg>(args.This());
encode_request *enc_req = (encode_request *)malloc(sizeof(*enc_req));
if (!enc_req)
return VException("malloc in Jpeg::JpegEncodeAsync failed.");
enc_req->callback = Persistent<Function>::New(callback);
enc_req->jpeg_obj = jpeg;
enc_req->jpeg = NULL;
enc_req->jpeg_len = 0;
enc_req->error = NULL;
eio_custom(EIO_JpegEncode, EIO_PRI_DEFAULT, EIO_JpegEncodeAfter, enc_req);
ev_ref(EV_DEFAULT_UC);
jpeg->Ref();
return Undefined();
}