/usr/include/guichan/sdl/sdlpixel.hpp is in libguichan-dev 0.8.2-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 | /* _______ __ __ __ ______ __ __ _______ __ __
* / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
* / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
* / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
* / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
* /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
* \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
*
* 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
|