SDLRenderer Class Reference

#include <sdl_renderer.hpp>

Inherits Renderer.

List of all members.

Public Member Functions
	SDLRenderer ()
	~SDLRenderer ()
void	draw_surface (const DrawingRequest &request)
void	draw_surface_part (const DrawingRequest &request)
void	draw_text (const DrawingRequest &request)
void	draw_gradient (const DrawingRequest &request)
void	draw_filled_rect (const DrawingRequest &request)
void	draw_inverse_ellipse (const DrawingRequest &request)
void	do_take_screenshot ()
void	flip ()
void	resize (int w, int h)
void	apply_config ()
Private Member Functions
	SDLRenderer (const SDLRenderer &)
SDLRenderer &	operator= (const SDLRenderer &)
Private Attributes
SDL_Surface *	screen
int	numerator
int	denominator

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Detailed Description

Definition at line 24 of file sdl_renderer.hpp.

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Constructor & Destructor Documentation

SDLRenderer::SDLRenderer

(

)

Definition at line 113 of file sdl_renderer.cpp.

References denominator, g_config, Renderer::instance_, log_info, numerator, screen, texture_manager, and Config::use_fullscreen.

                         :
  screen(),
  numerator(),
  denominator()
{
  Renderer::instance_ = this;

  const SDL_VideoInfo *info = SDL_GetVideoInfo();
  log_info << "Hardware surfaces are " << (info->hw_available ? "" : "not ") << "available." << std::endl;
  log_info << "Hardware to hardware blits are " << (info->blit_hw ? "" : "not ") << "accelerated." << std::endl;
  log_info << "Hardware to hardware blits with colorkey are " << (info->blit_hw_CC ? "" : "not ") << "accelerated." << std::endl;
  log_info << "Hardware to hardware blits with alpha are " << (info->blit_hw_A ? "" : "not ") << "accelerated." << std::endl;
  log_info << "Software to hardware blits are " << (info->blit_sw ? "" : "not ") << "accelerated." << std::endl;
  log_info << "Software to hardware blits with colorkey are " << (info->blit_sw_CC ? "" : "not ") << "accelerated." << std::endl;
  log_info << "Software to hardware blits with alpha are " << (info->blit_sw_A ? "" : "not ") << "accelerated." << std::endl;
  log_info << "Color fills are " << (info->blit_fill ? "" : "not ") << "accelerated." << std::endl;

  int flags = SDL_SWSURFACE | SDL_ANYFORMAT;
  if(g_config->use_fullscreen)
    flags |= SDL_FULLSCREEN;
    
  int width  = 800; //FIXME: config->screenwidth;
  int height = 600; //FIXME: config->screenheight;

  screen = SDL_SetVideoMode(width, height, 0, flags);
  if(screen == 0) {
    std::stringstream msg;
    msg << "Couldn't set video mode (" << width << "x" << height
        << "): " << SDL_GetError();
    throw std::runtime_error(msg.str());
  }

  numerator   = 1;
  denominator = 1;
  /* FIXME: 
     float xfactor = (float) config->screenwidth / SCREEN_WIDTH;
     float yfactor = (float) config->screenheight / SCREEN_HEIGHT;
     if(xfactor < yfactor)
     {
     numerator = config->screenwidth;
     denominator = SCREEN_WIDTH;
     }
     else
     {
     numerator = config->screenheight;
     denominator = SCREEN_HEIGHT;
     }
  */
  if(texture_manager == 0)
    texture_manager = new TextureManager();
}

SDLRenderer::~SDLRenderer

(

)

Definition at line 165 of file sdl_renderer.cpp.

{
}

SDLRenderer::SDLRenderer

(

const SDLRenderer &

)

[private]

---

Member Function Documentation

void SDLRenderer::draw_surface

(

const DrawingRequest &

request

)

[virtual]

Implements Renderer.

Definition at line 170 of file sdl_renderer.cpp.

References DrawingRequest::alpha, DrawingRequest::color, denominator, DrawingRequest::drawing_effect, Surface::get_flipx(), SDLSurfaceData::get_src_rect(), Surface::get_surface_data(), Surface::get_texture(), HORIZONTAL_FLIP, numerator, DrawingRequest::pos, DrawingRequest::request_data, screen, Vector::x, and Vector::y.

{
  //FIXME: support parameters request.alpha, request.angle, request.blend
  const Surface* surface = (const Surface*) request.request_data;
  boost::shared_ptr<SDLTexture> sdltexture = boost::dynamic_pointer_cast<SDLTexture>(surface->get_texture());
  SDLSurfaceData *surface_data = reinterpret_cast<SDLSurfaceData *>(surface->get_surface_data());

  DrawingEffect effect = request.drawing_effect;
  if (surface->get_flipx()) effect = HORIZONTAL_FLIP;

  SDL_Surface *transform = sdltexture->get_transform(request.color, effect);

  // get and check SDL_Surface
  if (transform == 0) {
    std::cerr << "Warning: Tried to draw NULL surface, skipped draw" << std::endl;
    return;
  }

  SDL_Rect *src_rect = surface_data->get_src_rect(effect);
  SDL_Rect dst_rect;
  dst_rect.x = (int) request.pos.x * numerator / denominator;
  dst_rect.y = (int) request.pos.y * numerator / denominator;

  Uint8 alpha = 0;
  if(request.alpha != 1.0)
  {
    if(!transform->format->Amask)
    {
      if(transform->flags & SDL_SRCALPHA)
      {
        alpha = transform->format->alpha;
      }
      else
      {
        alpha = 255;
      }
      SDL_SetAlpha(transform, SDL_SRCALPHA, (Uint8) (request.alpha * alpha));
    }
    /*else
      {
      transform = apply_alpha(transform, request.alpha);
      }*/
  }

  SDL_BlitSurface(transform, src_rect, screen, &dst_rect);

  if(request.alpha != 1.0)
  {
    if(!transform->format->Amask)
    {
      if(alpha == 255)
      {
        SDL_SetAlpha(transform, SDL_RLEACCEL, 0);
      }
      else
      {
        SDL_SetAlpha(transform, SDL_SRCALPHA | SDL_RLEACCEL, alpha);
      }
    }
    /*else
      {
      SDL_FreeSurface(transform);
      }*/
  }
}

void SDLRenderer::draw_surface_part

(

const DrawingRequest &

request

)

[virtual]

Implements Renderer.

Definition at line 237 of file sdl_renderer.cpp.

References DrawingRequest::alpha, DrawingRequest::color, denominator, DrawingRequest::drawing_effect, HORIZONTAL_FLIP, numerator, DrawingRequest::pos, DrawingRequest::request_data, screen, SurfacePartRequest::size, SurfacePartRequest::source, SurfacePartRequest::surface, VERTICAL_FLIP, Vector::x, and Vector::y.

{
  const SurfacePartRequest* surfacepartrequest
    = (SurfacePartRequest*) request.request_data;

  const Surface* surface = surfacepartrequest->surface;
  boost::shared_ptr<SDLTexture> sdltexture = boost::dynamic_pointer_cast<SDLTexture>(surface->get_texture());

  DrawingEffect effect = request.drawing_effect;
  if (surface->get_flipx()) effect = HORIZONTAL_FLIP;

  SDL_Surface *transform = sdltexture->get_transform(request.color, effect);

  // get and check SDL_Surface
  if (transform == 0) {
    std::cerr << "Warning: Tried to draw NULL surface, skipped draw" << std::endl;
    return;
  }

  int ox, oy;
  if (effect == HORIZONTAL_FLIP)
  {
    ox = sdltexture->get_texture_width() - surface->get_x() - (int) surfacepartrequest->size.x;
  }
  else
  {
    ox = surface->get_x();
  }
  if (effect == VERTICAL_FLIP)
  {
    oy = sdltexture->get_texture_height() - surface->get_y() - (int) surfacepartrequest->size.y;
  }
  else
  {
    oy = surface->get_y();
  }

  SDL_Rect src_rect;
  src_rect.x = (ox + (int) surfacepartrequest->source.x) * numerator / denominator;
  src_rect.y = (oy + (int) surfacepartrequest->source.y) * numerator / denominator;
  src_rect.w = (int) surfacepartrequest->size.x * numerator / denominator;
  src_rect.h = (int) surfacepartrequest->size.y * numerator / denominator;

  SDL_Rect dst_rect;
  dst_rect.x = (int) request.pos.x * numerator / denominator;
  dst_rect.y = (int) request.pos.y * numerator / denominator;

  Uint8 alpha = 0;
  if(request.alpha != 1.0)
  {
    if(!transform->format->Amask)
    {
      if(transform->flags & SDL_SRCALPHA)
      {
        alpha = transform->format->alpha;
      }
      else
      {
        alpha = 255;
      }
      SDL_SetAlpha(transform, SDL_SRCALPHA, (Uint8) (request.alpha * alpha));
    }
    /*else
      {
      transform = apply_alpha(transform, request.alpha);
      }*/
  }

  SDL_BlitSurface(transform, &src_rect, screen, &dst_rect);

  if(request.alpha != 1.0)
  {
    if(!transform->format->Amask)
    {
      if(alpha == 255)
      {
        SDL_SetAlpha(transform, SDL_RLEACCEL, 0);
      }
      else
      {
        SDL_SetAlpha(transform, SDL_SRCALPHA | SDL_RLEACCEL, alpha);
      }
    }
    /*else
      {
      SDL_FreeSurface(transform);
      }*/
  }
}

void SDLRenderer::draw_text

(

const DrawingRequest &

request

)

void SDLRenderer::draw_gradient

(

const DrawingRequest &

request

)

[virtual]

Implements Renderer.

Definition at line 328 of file sdl_renderer.cpp.

References GradientRequest::bottom, DrawingRequest::request_data, screen, and GradientRequest::top.

{
  const GradientRequest* gradientrequest 
    = (GradientRequest*) request.request_data;
  const Color& top = gradientrequest->top;
  const Color& bottom = gradientrequest->bottom;

  for(int y = 0;y < screen->h;++y)
  {
    Uint8 r = (Uint8)((((float)(top.red-bottom.red)/(0-screen->h)) * y + top.red) * 255);
    Uint8 g = (Uint8)((((float)(top.green-bottom.green)/(0-screen->h)) * y + top.green) * 255);
    Uint8 b = (Uint8)((((float)(top.blue-bottom.blue)/(0-screen->h)) * y + top.blue) * 255);
    Uint8 a = (Uint8)((((float)(top.alpha-bottom.alpha)/(0-screen->h)) * y + top.alpha) * 255);
    Uint32 color = SDL_MapRGB(screen->format, r, g, b);

    SDL_Rect rect;
    rect.x = 0;
    rect.y = y;
    rect.w = screen->w;
    rect.h = 1;

    if(a == SDL_ALPHA_OPAQUE) {
      SDL_FillRect(screen, &rect, color);
    } else if(a != SDL_ALPHA_TRANSPARENT) {
      SDL_Surface *temp = SDL_CreateRGBSurface(screen->flags, rect.w, rect.h, screen->format->BitsPerPixel, screen->format->Rmask, screen->format->Gmask, screen->format->Bmask, screen->format->Amask);

      SDL_FillRect(temp, 0, color);
      SDL_SetAlpha(temp, SDL_SRCALPHA | SDL_RLEACCEL, a);
      SDL_BlitSurface(temp, 0, screen, &rect);
      SDL_FreeSurface(temp);
    }
  }
}

void SDLRenderer::draw_filled_rect

(

const DrawingRequest &

request

)

[virtual]

Implements Renderer.

Definition at line 363 of file sdl_renderer.cpp.

References Color::alpha, Color::blue, FillRectRequest::color, Color::green, DrawingRequest::pos, Color::red, DrawingRequest::request_data, screen, SCREEN_HEIGHT, SCREEN_WIDTH, FillRectRequest::size, Vector::x, and Vector::y.

{
  const FillRectRequest* fillrectrequest
    = (FillRectRequest*) request.request_data;

  SDL_Rect rect;
  rect.x = (Sint16)request.pos.x * screen->w / SCREEN_WIDTH;
  rect.y = (Sint16)request.pos.y * screen->h / SCREEN_HEIGHT;
  rect.w = (Uint16)fillrectrequest->size.x * screen->w / SCREEN_WIDTH;
  rect.h = (Uint16)fillrectrequest->size.y * screen->h / SCREEN_HEIGHT;
  if((rect.w == 0) || (rect.h == 0)) {
    return;
  }
  Uint8 r = static_cast<Uint8>(fillrectrequest->color.red * 255);
  Uint8 g = static_cast<Uint8>(fillrectrequest->color.green * 255);
  Uint8 b = static_cast<Uint8>(fillrectrequest->color.blue * 255);
  Uint8 a = static_cast<Uint8>(fillrectrequest->color.alpha * 255);
  Uint32 color = SDL_MapRGB(screen->format, r, g, b);
  if(a == SDL_ALPHA_OPAQUE) {
    SDL_FillRect(screen, &rect, color);
  } else if(a != SDL_ALPHA_TRANSPARENT) {
    SDL_Surface *temp = SDL_CreateRGBSurface(screen->flags, rect.w, rect.h, screen->format->BitsPerPixel, screen->format->Rmask, screen->format->Gmask, screen->format->Bmask, screen->format->Amask);

    SDL_FillRect(temp, 0, color);
    SDL_SetAlpha(temp, SDL_SRCALPHA | SDL_RLEACCEL, a);
    SDL_BlitSurface(temp, 0, screen, &rect);
    SDL_FreeSurface(temp);
  }
}

void SDLRenderer::draw_inverse_ellipse

(

const DrawingRequest &

request

)

[virtual]

Implements Renderer.

Definition at line 394 of file sdl_renderer.cpp.

{
}

void SDLRenderer::do_take_screenshot

(

)

[virtual]

Implements Renderer.

Definition at line 399 of file sdl_renderer.cpp.

References log_debug, log_warning, and screen.

{
  // [Christoph] TODO: Yes, this method also takes care of the actual disk I/O. Split it?

  SDL_Surface *screen = SDL_GetVideoSurface();

  // save screenshot
  static const std::string writeDir = PHYSFS_getWriteDir();
  static const std::string dirSep = PHYSFS_getDirSeparator();
  static const std::string baseName = "screenshot";
  static const std::string fileExt = ".bmp";
  std::string fullFilename;
  for (int num = 0; num < 1000; num++) {
    std::ostringstream oss;
    oss << baseName;
    oss << std::setw(3) << std::setfill('0') << num;
    oss << fileExt;
    std::string fileName = oss.str();
    fullFilename = writeDir + dirSep + fileName;
    if (!PHYSFS_exists(fileName.c_str())) {
      SDL_SaveBMP(screen, fullFilename.c_str());
      log_debug << "Wrote screenshot to \"" << fullFilename << "\"" << std::endl;
      return;
    }
  }
  log_warning << "Did not save screenshot, because all files up to \"" << fullFilename << "\" already existed" << std::endl;
}

void SDLRenderer::flip

(

)

[virtual]

Implements Renderer.

Definition at line 428 of file sdl_renderer.cpp.

References screen.

{
  SDL_Flip(screen);
}

void SDLRenderer::resize	(	int	w,
		int	h
	)			[virtual]

Implements Renderer.

Definition at line 434 of file sdl_renderer.cpp.

{
    
}

void SDLRenderer::apply_config

(

)

[inline, virtual]

Implements Renderer.

Definition at line 39 of file sdl_renderer.hpp.

{}

SDLRenderer& SDLRenderer::operator=

(

const SDLRenderer &

)

[private]

---

Member Data Documentation

SDL_Surface* SDLRenderer::screen [private]

Definition at line 42 of file sdl_renderer.hpp.

Referenced by do_take_screenshot(), draw_filled_rect(), draw_gradient(), draw_surface(), draw_surface_part(), flip(), and SDLRenderer().

int SDLRenderer::numerator [private]

Definition at line 43 of file sdl_renderer.hpp.

Referenced by draw_surface(), draw_surface_part(), and SDLRenderer().

int SDLRenderer::denominator [private]

Definition at line 44 of file sdl_renderer.hpp.

Referenced by draw_surface(), draw_surface_part(), and SDLRenderer().

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The documentation for this class was generated from the following files:

• src/video/sdl/sdl_renderer.hpp
• src/video/sdl/sdl_renderer.cpp

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