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+/* _______ __ __ __ ______ __ __ _______ __ __
+ * / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
+ * / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
+ * / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
+ * / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
+ * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
+ * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
+ *
+ * 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
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