node-canvas/src/Image.h

//
// Image.h
//
// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
//

#ifndef __NODE_IMAGE_H__
#define __NODE_IMAGE_H__

#include "Canvas.h"

#ifdef HAVE_JPEG
#include <jpeglib.h>
#include <jerror.h>
#endif

class Image: public node::ObjectWrap {
  public:
    char *filename;
    int width, height;
    Persistent<Function> onload;
    Persistent<Function> onerror;
    static Persistent<FunctionTemplate> constructor;
    static void Initialize(Handle<Object> target);
    static Handle<Value> New(const Arguments &args);
    static Handle<Value> GetSource(Local<String> prop, const AccessorInfo &info);
    static Handle<Value> GetOnload(Local<String> prop, const AccessorInfo &info);
    static Handle<Value> GetOnerror(Local<String> prop, const AccessorInfo &info);
    static Handle<Value> GetComplete(Local<String> prop, const AccessorInfo &info);
    static Handle<Value> GetWidth(Local<String> prop, const AccessorInfo &info);
    static Handle<Value> GetHeight(Local<String> prop, const AccessorInfo &info);
    static void SetSource(Local<String> prop, Local<Value> val, const AccessorInfo &info);
    static void SetOnload(Local<String> prop, Local<Value> val, const AccessorInfo &info);
    static void SetOnerror(Local<String> prop, Local<Value> val, const AccessorInfo &info);
    inline cairo_surface_t *surface(){ return _surface; } 
    inline uint8_t *data(){ return cairo_image_surface_get_data(_surface); } 
    inline int stride(){ return cairo_image_surface_get_stride(_surface); } 
    static int isPNG(uint8_t *data);
    static int isJPEG(uint8_t *data);
    static int isGIF(uint8_t *data);
    static cairo_status_t readPNG(void *closure, unsigned char *data, unsigned len);
    inline int isComplete(){ return COMPLETE == state; }
    cairo_status_t loadSurface();
    cairo_status_t loadFromBuffer(uint8_t *buf, unsigned len);
    cairo_status_t loadPNGFromBuffer(uint8_t *buf);
    cairo_status_t loadPNG();
#ifdef HAVE_GIF
    cairo_status_t loadGIFFromBuffer(uint8_t *buf, unsigned len);
    cairo_status_t loadGIF(FILE *stream);
#endif
#ifdef HAVE_JPEG
    cairo_status_t loadJPEGFromBuffer(uint8_t *buf, unsigned len);
    cairo_status_t loadJPEG(FILE *stream);
    cairo_status_t decodeJPEGIntoSurface(jpeg_decompress_struct *info);
#endif
    void error(Local<Value> error);
    void loaded();
    cairo_status_t load();
    Image();

    enum {
        DEFAULT
      , LOADING
      , COMPLETE
    } state;

    enum {
      DATA_IMAGE,
      DATA_MIME,
      DATA_IMAGE_AND_MIME
    } data_mode;

    typedef enum {
        UNKNOWN
      , GIF
      , JPEG
      , PNG
    } type;

    static type extension(const char *filename);

  private:
    cairo_surface_t *_surface;
    uint8_t *_data;
    ~Image();
};

#endif