--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ext/guichan-0.8.2/include/guichan/sdl/sdlpixel.hpp	Mon Jan 11 23:34:52 2010 +0000
@@ -0,0 +1,260 @@
+/*      _______   __   __   __   ______   __   __   _______   __   __
+ *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
+ *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
+ *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
+ *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
+ * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
+ * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
+ *
+ * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
+ *
+ *
+ * Per Larsson a.k.a finalman
+ * Olof Naessén a.k.a jansem/yakslem
+ *
+ * Visit: http://guichan.sourceforge.net
+ *
+ * License: (BSD)
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name of Guichan nor the names of its contributors may
+ *    be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GCN_SDLPIXEL_HPP
+#define GCN_SDLPIXEL_HPP
+
+#include "SDL.h"
+#include "guichan/color.hpp"
+
+namespace gcn
+{
+
+    /**
+     * Checks a pixels color of an SDL_Surface.
+     *
+     * @param surface an SDL_Surface where to check for a pixel color.
+     * @param x the x coordinate on the surface.
+     * @param y the y coordinate on the surface.
+     * @return a color of a pixel.
+     */
+    inline const Color SDLgetPixel(SDL_Surface* surface, int x, int y)
+    {
+        int bpp = surface->format->BytesPerPixel;
+
+        SDL_LockSurface(surface);
+
+        Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
+
+        unsigned int color = 0;
+
+        switch(bpp)
+        {
+          case 1:
+              color = *p;
+              break;
+
+          case 2:
+              color = *(Uint16 *)p;
+              break;
+
+          case 3:
+              if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
+              {
+                  color = p[0] << 16 | p[1] << 8 | p[2];
+              }
+              else
+              {
+                  color = p[0] | p[1] << 8 | p[2] << 16;
+              }
+              break;
+
+          case 4:
+              color = *(Uint32 *)p;
+              break;
+
+        }
+
+        unsigned char r,g,b,a;
+
+        SDL_GetRGBA(color, surface->format, &r, &g, &b, &a);
+        SDL_UnlockSurface(surface);
+
+        return Color(r,g,b,a);
+    }
+
+    /**
+     * Puts a pixel on an SDL_Surface.
+     *
+     * @param x the x coordinate on the surface.
+     * @param y the y coordinate on the surface.
+     * @param color the color the pixel should be in.
+     */
+    inline void SDLputPixel(SDL_Surface* surface, int x, int y, const Color& color)
+    {
+        int bpp = surface->format->BytesPerPixel;
+
+        SDL_LockSurface(surface);
+
+        Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
+
+        Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
+
+        switch(bpp)
+        {
+          case 1:
+              *p = pixel;
+              break;
+
+          case 2:
+              *(Uint16 *)p = pixel;
+              break;
+
+          case 3:
+              if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
+              {
+                  p[0] = (pixel >> 16) & 0xff;
+                  p[1] = (pixel >> 8) & 0xff;
+                  p[2] = pixel & 0xff;
+              }
+              else
+              {
+                  p[0] = pixel & 0xff;
+                  p[1] = (pixel >> 8) & 0xff;
+                  p[2] = (pixel >> 16) & 0xff;
+              }
+              break;
+
+          case 4:
+              *(Uint32 *)p = pixel;
+              break;
+        }
+
+        SDL_UnlockSurface(surface);
+    }
+
+    /**
+     * Blends two 32 bit colors together.
+     *
+     * @param src the source color.
+     * @param dst the destination color.
+     * @param a alpha.
+     */
+    inline unsigned int SDLAlpha32(unsigned int src, unsigned int dst, unsigned char a)
+    {
+        unsigned int b = ((src & 0xff) * a + (dst & 0xff) * (255 - a)) >> 8;
+        unsigned int g = ((src & 0xff00) * a + (dst & 0xff00) * (255 - a)) >> 8;
+        unsigned int r = ((src & 0xff0000) * a + (dst & 0xff0000) * (255 - a)) >> 8;
+
+        return (b & 0xff) | (g & 0xff00) | (r & 0xff0000);
+    }
+
+    /**
+     * Blends two 16 bit colors together.
+     *
+     * @param src the source color.
+     * @param dst the destination color.
+     * @param a alpha.
+     */
+    inline unsigned short SDLAlpha16(unsigned short src, unsigned short dst, unsigned char a, const SDL_PixelFormat *f)
+    {
+        unsigned int b = ((src & f->Rmask) * a + (dst & f->Rmask) * (255 - a)) >> 8;
+        unsigned int g = ((src & f->Gmask) * a + (dst & f->Gmask) * (255 - a)) >> 8;
+        unsigned int r = ((src & f->Bmask) * a + (dst & f->Bmask) * (255 - a)) >> 8;
+
+        return (unsigned short)((b & f->Rmask) | (g & f->Gmask) | (r & f->Bmask));
+    }
+
+    /*
+    typedef struct{
+        SDL_Palette *palette;
+        Uint8  BitsPerPixel;
+        Uint8  BytesPerPixel;
+        Uint32 Rmask, Gmask, Bmask, Amask;
+        Uint8  Rshift, Gshift, Bshift, Ashift;
+        Uint8  Rloss, Gloss, Bloss, Aloss;
+        Uint32 colorkey;
+        Uint8  alpha;
+    } SDL_PixelFormat;
+    */
+
+    /**
+     * Puts a pixel on an SDL_Surface with alpha
+     *
+     * @param x the x coordinate on the surface.
+     * @param y the y coordinate on the surface.
+     * @param color the color the pixel should be in.
+     */
+    inline void SDLputPixelAlpha(SDL_Surface* surface, int x, int y, const Color& color)
+    {
+        int bpp = surface->format->BytesPerPixel;
+
+        SDL_LockSurface(surface);
+
+        Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
+
+        Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
+
+        switch(bpp)
+        {
+          case 1:
+              *p = pixel;
+              break;
+
+          case 2:
+              *(Uint16 *)p = SDLAlpha16(pixel, *(Uint32 *)p, color.a, surface->format);
+              break;
+
+          case 3:
+              if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
+              {
+                  unsigned int r = (p[0] * (255 - color.a) + color.r * color.a) >> 8;
+                  unsigned int g = (p[1] * (255 - color.a) + color.g * color.a) >> 8;
+                  unsigned int b = (p[2] * (255 - color.a) + color.b * color.a) >> 8;
+
+                  p[2] = b;
+                  p[1] = g;
+                  p[0] = r;
+              }
+              else
+              {
+                  unsigned int r = (p[2] * (255 - color.a) + color.r * color.a) >> 8;
+                  unsigned int g = (p[1] * (255 - color.a) + color.g * color.a) >> 8;
+                  unsigned int b = (p[0] * (255 - color.a) + color.b * color.a) >> 8;
+
+                  p[0] = b;
+                  p[1] = g;
+                  p[2] = r;
+              }
+              break;
+
+          case 4:
+              *(Uint32 *)p = SDLAlpha32(pixel, *(Uint32 *)p, color.a);
+              break;
+        }
+
+        SDL_UnlockSurface(surface);
+    }
+}
+
+#endif // end GCN_SDLPIXEL_HPP