node-canvas/src/canvas.cc

//
// canvas.cc
//
// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
//

#include "canvas.h"

using namespace v8;

/*
 * Initialize Canvas.
 */

void
Canvas::Initialize(Handle<Object> target) {
  HandleScope scope;
  Local<FunctionTemplate> t = FunctionTemplate::New(Canvas::New);
  t->InstanceTemplate()->SetInternalFieldCount(1);
  t->SetClassName(String::NewSymbol("Canvas"));

  NODE_SET_PROTOTYPE_METHOD(t, "savePNG", SavePNG);
  target->Set(String::NewSymbol("Canvas"), t->GetFunction());
}

/*
 * Initialize a Canvas with the given width and height.
 */

Handle<Value>
Canvas::New(const Arguments &args) {
  HandleScope scope;

  if (!args[0]->IsNumber()) 
    return ThrowException(Exception::TypeError(String::New("width required")));
  if (!args[1]->IsNumber()) 
    return ThrowException(Exception::TypeError(String::New("height required")));

  Canvas *canvas = new Canvas(args[0]->Uint32Value(), args[1]->Uint32Value());
  canvas->Wrap(args.This());
  return args.This();
}

/*
 * Initialize cairo surface.
 */

Canvas::Canvas(int width, int height): ObjectWrap() {
  _surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
}

/*
 * Destroy cairo surface.
 */

Canvas::~Canvas() {
  cairo_surface_destroy(_surface);
}

/*
 * Save a PNG at the given path.
 */

Handle<Value>
Canvas::SavePNG(const Arguments &args) {
  HandleScope scope;
  Canvas *canvas = ObjectWrap::Unwrap<Canvas>(args.This());
  
  if (!args[0]->IsString())
    return ThrowException(Exception::TypeError(String::New("path required")));

  String::Utf8Value path(args[0]->ToString());
  cairo_surface_write_to_png(canvas->getSurface(), *path);
  return Undefined();
}