sdlgraphics.cpp

Linux系统下的《红色警戒》游戏

/*      _______   __   __   __   ______   __   __   _______   __   __                 
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 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /                    
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/                      
 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naess閚 a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
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/*
 * For comments regarding functions please see the header file. 
 */

#include "guichan/exception.h"
#include "guichan/font.h"
#include "guichan/sdl/sdlgraphics.h"
#include "guichan/sdl/sdlpixel.h"

#include "stratagus.h"
#include "video.h"

// For some reason an old version of MSVC did not like std::abs,
// so we added this macro.
#ifndef ABS
#define ABS(x) ((x)<0?-(x):(x))
#endif

namespace gcn
{

    SDLGraphics::SDLGraphics()
    {
        mAlpha = false;
    }
    
    void SDLGraphics::_beginDraw()
    {
        Rectangle area;
        area.x = 0;
        area.y = 0;
        area.width = mTarget->w;
        area.height = mTarget->h;
        pushClipArea(area);        
    }

    void SDLGraphics::_endDraw()
    {
        popClipArea();
    }
    
    void SDLGraphics::setTarget(SDL_Surface* target)
    {
        mTarget = target;        
    }

    bool SDLGraphics::pushClipArea(Rectangle area)
    {
        SDL_Rect rect;
        bool result = Graphics::pushClipArea(area);
        
        ClipRectangle carea = mClipStack.top();
        rect.x = carea.x;
        rect.y = carea.y;
        rect.w = carea.width;
        rect.h = carea.height;
    
        SDL_SetClipRect(mTarget, &rect);

        return result;    
    }

    void SDLGraphics::popClipArea()
    {
        SDL_Rect rect;
        Graphics::popClipArea();

        if (mClipStack.empty())
        {
            return;
        }
        
        ClipRectangle carea = mClipStack.top();
        rect.x = carea.x;
        rect.y = carea.y;
        rect.w = carea.width;
        rect.h = carea.height;
    
        SDL_SetClipRect(mTarget, &rect);    
    }
  
    SDL_Surface* SDLGraphics::getTarget() const
    {
        return mTarget;
    }
  
    void SDLGraphics::drawImage(const Image* image, int srcX,
                                int srcY, int dstX, int dstY,
                                int width, int height)
    {
        ClipRectangle top = mClipStack.top();
        SDL_Rect src;
        SDL_Rect dst;
        src.x = srcX;
        src.y = srcY;
        src.w = width;
        src.h = height;
        dst.x = dstX + top.xOffset;
        dst.y = dstY + top.yOffset;

        SDL_Surface* srcImage = (SDL_Surface*)image->_getData();
    
        SDL_BlitSurface(srcImage, &src, mTarget, &dst);    
    }

    void SDLGraphics::fillRectangle(const Rectangle& rectangle)
    {    
        Rectangle area = rectangle;
        ClipRectangle top = mClipStack.top(); 

        area.x += top.xOffset;
        area.y += top.yOffset;

        if(!area.intersect(top) || mColor.a == 0)
        {
            return;
        }

        if (mAlpha)
        {
            int x1 = area.x > top.x ? area.x : top.x;
            int y1 = area.y > top.y ? area.y : top.y;
            int x2 = area.x + area.width < top.x + top.width ? area.x + area.width : top.x + top.width;
            int y2 = area.y + area.height < top.y + top.height ? area.y + area.height : top.y + top.height;

			Video.FillTransRectangle(SDL_MapRGB(TheScreen->format, mColor.r, mColor.g, mColor.b),
				x1, y1, x2 - x1, y2 - y1, mColor.a);
        }
        else
        {
            SDL_Rect rect;
            rect.x = area.x;
            rect.y = area.y;
            rect.w = area.width;
            rect.h = area.height;
    
            Uint32 color = SDL_MapRGBA(mTarget->format, mColor.r, mColor.g, mColor.b, mColor.a);
            SDL_FillRect(mTarget, &rect, color);
        }        
    }

    void SDLGraphics::drawPoint(int x, int y)
    {
        ClipRectangle top = mClipStack.top();
        x += top.xOffset;
        y += top.yOffset;

        if(!top.isPointInRect(x,y))
            return;

        if (mAlpha)
        {
            SDLputPixelAlpha(mTarget, x, y, mColor);
        }
        else
        {            
            SDLputPixel(mTarget, x, y, mColor);
        }    
    }

    void SDLGraphics::drawHLine(int x1, int y, int x2)
    {
        ClipRectangle top = mClipStack.top();
        x1 += top.xOffset;
        y += top.yOffset;
        x2 += top.xOffset;

        if (y < top.y || y >= top.y + top.height)
            return;
    
        if (x1 > x2)
        {
            x1 ^= x2;
            x2 ^= x1;
            x1 ^= x2;
        }

        if (top.x > x1)
        {
            if (top.x > x2)
            {
                return;
            }
            x1 = top.x;
        }

        if (top.x + top.width <= x2)
        {
            if (top.x + top.width <= x1)
            {
                return;
            }      
            x2 = top.x + top.width -1;
        }
    
        int bpp = mTarget->format->BytesPerPixel;
    
        SDL_LockSurface(mTarget);

        Uint8 *p = (Uint8 *)mTarget->pixels + y * mTarget->pitch + x1 * bpp;
    
        Uint32 pixel = SDL_MapRGB(mTarget->format, mColor.r, mColor.g, mColor.b);
    
        switch(bpp) {
          case 1:
          {
              for (;x1 <= x2; ++x1)
              { 
                  *(p++) = pixel;
              }
          } break;
      
          case 2:
          {
              Uint16* q = (Uint16*)p;
              for (;x1 <= x2; ++x1)
              {
                  *(q++) = pixel;
              }
          } break;
        
          case 3:  
          {
              if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {
                  for (;x1 <= x2; ++x1)
                  {
                      p[0] = (pixel >> 16) & 0xff;
                      p[1] = (pixel >> 8) & 0xff;
                      p[2] = pixel & 0xff;
                      p += 3;
                  }
              }
              else
              {
                  for (;x1 <= x2; ++x1)
                  {
                      p[0] = pixel & 0xff;
                      p[1] = (pixel >> 8) & 0xff;
                      p[2] = (pixel >> 16) & 0xff;
                      p += 3;
                  }
              } 
          } break;
  
          case 4:
          {
              Uint32* q = (Uint32*)p;
              for (;x1 <= x2; ++x1)
              {
                  if (mAlpha)
                  {
                      *q = SDLAlpha32(pixel,*q,mColor.a);
                      q++;
                  }
                  else
                  {
                      *(q++) = pixel;
                  }
              }
          } break;

        } // end switch