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