src/video/drawing_context.hpp

Go to the documentation of this file.

//  SuperTux
//  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.

#ifndef HEADER_SUPERTUX_VIDEO_DRAWING_CONTEXT_HPP
#define HEADER_SUPERTUX_VIDEO_DRAWING_CONTEXT_HPP

#include <memory>
#include <string>
#include <vector>
#include <stdint.h>
#include <obstack.h>

#include "math/rectf.hpp"
#include "math/vector.hpp"
#include "video/color.hpp"
#include "video/drawing_request.hpp"
#include "video/font.hpp"
#include "video/font_ptr.hpp"
#include "video/texture.hpp"

class Surface;
class Texture;
class Renderer;
class Lightmap;

inline int next_po2(int val)
{
  int result = 1;
  while(result < val)
    result *= 2;

  return result;
}

class DrawingContext
{
public:
  DrawingContext();
  ~DrawingContext();

  void init_renderer();

  void draw_surface(SurfacePtr surface, const Vector& position,
                    int layer);
  void draw_surface(SurfacePtr surface, const Vector& position,
                    float angle, const Color& color, const Blend& blend,
                    int layer);
  void draw_surface_part(SurfacePtr surface, const Vector& source,
                         const Vector& size, const Vector& dest, int layer);
  void draw_text(FontPtr font, const std::string& text,
                 const Vector& position, FontAlignment alignment, int layer, Color color = Color(1.0,1.0,1.0));

  void draw_center_text(FontPtr font, const std::string& text,
                        const Vector& position, int layer, Color color = Color(1.0,1.0,1.0));
  void draw_gradient(const Color& from, const Color& to, int layer);
  void draw_filled_rect(const Vector& topleft, const Vector& size,
                        const Color& color, int layer);
  void draw_filled_rect(const Rectf& rect, const Color& color, int layer);
  void draw_filled_rect(const Rectf& rect, const Color& color, float radius, int layer);

  void draw_inverse_ellipse(const Vector& pos, const Vector& size, const Color& color, int layer);

  Rectf get_cliprect() const;

  void do_drawing();

  const Vector& get_translation() const
  {  return transform.translation;  }

  void set_translation(const Vector& newtranslation)
  {  transform.translation = newtranslation;  }

  void push_transform();
  void pop_transform();

  void set_drawing_effect(DrawingEffect effect);
  DrawingEffect get_drawing_effect() const;
  void set_alpha(float alpha);
  float get_alpha() const;

  void get_light(const Vector& position, Color* color );

  typedef ::Target Target;
  static const Target NORMAL = ::NORMAL;
  static const Target LIGHTMAP = ::LIGHTMAP;
  void push_target();
  void pop_target();
  void set_target(Target target);

  void set_ambient_color( Color new_color );

  void take_screenshot();

private:
  typedef std::vector<DrawingRequest*> DrawingRequests;

private:
  void handle_drawing_requests(DrawingRequests& requests);

private:
  class Transform
  {
  public:
    Vector translation;
    DrawingEffect drawing_effect;
    float alpha;

    Transform() :
      translation(),
      drawing_effect(NO_EFFECT), 
      alpha(1.0f)
    { }

    Vector apply(const Vector& v) const
    {
      return v - translation;
    }
  };

private:
  Renderer *renderer;
  Lightmap *lightmap;

  std::vector<Transform> transformstack;
  Transform transform;

  std::vector<Blend> blend_stack;
  Blend blend_mode;

  DrawingRequests drawing_requests;
  DrawingRequests lightmap_requests;

  DrawingRequests* requests;
  Color ambient_color;

  Target target;
  std::vector<Target> target_stack;

  /* obstack holding the memory of the drawing requests */
  struct obstack obst;

  bool screenshot_requested; 
private:
  DrawingContext(const DrawingContext&);
  DrawingContext& operator=(const DrawingContext&);
};

#endif

/* EOF */

---