// vi:ft=cpp
/*
 * (c) 2010 Alexander Warg <warg@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 */
#pragma once

#include <l4/mag-gfx/geometry>
#include <l4/mag-gfx/gfx_colors>

namespace Mag_gfx {

class Font;
class Pixel_info;
class Texture;

class Canvas
{
protected:
  Rect _clip;
  Area _size;

  Canvas(Area const &sz) : _clip(Point(0,0), sz), _size(sz) {}
  virtual void flush_pixels(Rect const &) {}

public:
  enum Mix_mode { Solid, Mixed, Masked, Alpha };

  void set_clipping(Rect const &c)
  { _clip = Rect(Point(0,0), _size) & c; }

  Rect const &clip() const { return _clip; }
  bool clip_valid() const { return _clip.valid(); }

  Area const &size() const { return _size; }

  virtual ~Canvas() {}

  virtual Pixel_info const *type() const = 0;
  virtual void draw_box(Rect const &rect, Rgba32::Color color) = 0;
  virtual void draw_string(Point const &pos, Font const *f, Rgba32::Color color, char const *str, unsigned len = -1) = 0;
  virtual void draw_texture(Texture const *src, Rgb32::Color mix_color, Point const &pos, Mix_mode mode) = 0;

  virtual void *buffer() const = 0;
  virtual void buffer(void *buffer) = 0;
  virtual int bytes_per_line() const = 0;

  void draw_rect(Rect const &r, Rgba32::Color color);

};

}