Mozilla2:GFXSurface

Class Surface

We need a surface to draw on to. There will need to be multiple surface implementations such as win32, mac, linux, image, pdf, etc.

API

class ASurface {
public:
    // <insert refcount stuff here>

    virtual cairo_surface_t *CairoSurface();
    virtual int Format() const;
    virtual long Width() const;
    virtual long Height() const;

    // raw access
    // will convert to ARGB32 pre-multiplied data if required
    virtual SurfaceData* Lock(long x, long y, long width, long height);

    // when unlock() is called, the data will be written back.
    // lock() must be called before calling this method.
    virtual void Unlock(SurfaceData* data);
};

Class SurfaceData

I want something simple to give back a buffer for someone to modify when they call Lock() on their surface. It will always be ARGB32.

API

class SurfaceData {
private:
    long width;
    long height;
    unsigned long stride;
    long length;
    unsigned char *data;
public:
    SurfaceData(unsigned long _width, unsigned long _height,
                unsigned long _stride, long _length,
                unsigned char *_data) :
        width(_width), height(_height),
        stride(_stride), length(_length),  data(_data) {}

    long Width()  const { return width; }
    long Height() const { return height; }
    long Stride() const { return stride; }
    long Length() const { return length; }
    unsigned char *Data() { return data; }
};