Mercurial > fife-parpg

comparison ext/guichan-0.8.2/include/guichan/sdl/sdlpixel.hpp @ 378:64738befdf3b

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bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
author vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 11 Jan 2010 23:34:52 +0000
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377:fe6fb0e0ed23 378:64738befdf3b
1 /* _______ __ __ __ ______ __ __ _______ __ __
2 * / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
3 * / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
4 * / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
5 * / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
6 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
7 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
8 *
9 * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
10 *
11 *
12 * Per Larsson a.k.a finalman
13 * Olof Naessén a.k.a jansem/yakslem
14 *
15 * Visit: http://guichan.sourceforge.net
16 *
17 * License: (BSD)
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in
25 * the documentation and/or other materials provided with the
26 * distribution.
27 * 3. Neither the name of Guichan nor the names of its contributors may
28 * be used to endorse or promote products derived from this software
29 * without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
37 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
38 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
39 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
40 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
41 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43
44 #ifndef GCN_SDLPIXEL_HPP
45 #define GCN_SDLPIXEL_HPP
46
47 #include "SDL.h"
48 #include "guichan/color.hpp"
49
50 namespace gcn
51 {
52
53 /**
54 * Checks a pixels color of an SDL_Surface.
55 *
56 * @param surface an SDL_Surface where to check for a pixel color.
57 * @param x the x coordinate on the surface.
58 * @param y the y coordinate on the surface.
59 * @return a color of a pixel.
60 */
61 inline const Color SDLgetPixel(SDL_Surface* surface, int x, int y)
62 {
63 int bpp = surface->format->BytesPerPixel;
64
65 SDL_LockSurface(surface);
66
67 Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
68
69 unsigned int color = 0;
70
71 switch(bpp)
72 {
73 case 1:
74 color = *p;
75 break;
76
77 case 2:
78 color = *(Uint16 *)p;
79 break;
80
81 case 3:
82 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
83 {
84 color = p[0] << 16 | p[1] << 8 | p[2];
85 }
86 else
87 {
88 color = p[0] | p[1] << 8 | p[2] << 16;
89 }
90 break;
91
92 case 4:
93 color = *(Uint32 *)p;
94 break;
95
96 }
97
98 unsigned char r,g,b,a;
99
100 SDL_GetRGBA(color, surface->format, &r, &g, &b, &a);
101 SDL_UnlockSurface(surface);
102
103 return Color(r,g,b,a);
104 }
105
106 /**
107 * Puts a pixel on an SDL_Surface.
108 *
109 * @param x the x coordinate on the surface.
110 * @param y the y coordinate on the surface.
111 * @param color the color the pixel should be in.
112 */
113 inline void SDLputPixel(SDL_Surface* surface, int x, int y, const Color& color)
114 {
115 int bpp = surface->format->BytesPerPixel;
116
117 SDL_LockSurface(surface);
118
119 Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
120
121 Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
122
123 switch(bpp)
124 {
125 case 1:
126 *p = pixel;
127 break;
128
129 case 2:
130 *(Uint16 *)p = pixel;
131 break;
132
133 case 3:
134 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
135 {
136 p[0] = (pixel >> 16) & 0xff;
137 p[1] = (pixel >> 8) & 0xff;
138 p[2] = pixel & 0xff;
139 }
140 else
141 {
142 p[0] = pixel & 0xff;
143 p[1] = (pixel >> 8) & 0xff;
144 p[2] = (pixel >> 16) & 0xff;
145 }
146 break;
147
148 case 4:
149 *(Uint32 *)p = pixel;
150 break;
151 }
152
153 SDL_UnlockSurface(surface);
154 }
155
156 /**
157 * Blends two 32 bit colors together.
158 *
159 * @param src the source color.
160 * @param dst the destination color.
161 * @param a alpha.
162 */
163 inline unsigned int SDLAlpha32(unsigned int src, unsigned int dst, unsigned char a)
164 {
165 unsigned int b = ((src & 0xff) * a + (dst & 0xff) * (255 - a)) >> 8;
166 unsigned int g = ((src & 0xff00) * a + (dst & 0xff00) * (255 - a)) >> 8;
167 unsigned int r = ((src & 0xff0000) * a + (dst & 0xff0000) * (255 - a)) >> 8;
168
169 return (b & 0xff) | (g & 0xff00) | (r & 0xff0000);
170 }
171
172 /**
173 * Blends two 16 bit colors together.
174 *
175 * @param src the source color.
176 * @param dst the destination color.
177 * @param a alpha.
178 */
179 inline unsigned short SDLAlpha16(unsigned short src, unsigned short dst, unsigned char a, const SDL_PixelFormat *f)
180 {
181 unsigned int b = ((src & f->Rmask) * a + (dst & f->Rmask) * (255 - a)) >> 8;
182 unsigned int g = ((src & f->Gmask) * a + (dst & f->Gmask) * (255 - a)) >> 8;
183 unsigned int r = ((src & f->Bmask) * a + (dst & f->Bmask) * (255 - a)) >> 8;
184
185 return (unsigned short)((b & f->Rmask) | (g & f->Gmask) | (r & f->Bmask));
186 }
187
188 /*
189 typedef struct{
190 SDL_Palette *palette;
191 Uint8 BitsPerPixel;
192 Uint8 BytesPerPixel;
193 Uint32 Rmask, Gmask, Bmask, Amask;
194 Uint8 Rshift, Gshift, Bshift, Ashift;
195 Uint8 Rloss, Gloss, Bloss, Aloss;
196 Uint32 colorkey;
197 Uint8 alpha;
198 } SDL_PixelFormat;
199 */
200
201 /**
202 * Puts a pixel on an SDL_Surface with alpha
203 *
204 * @param x the x coordinate on the surface.
205 * @param y the y coordinate on the surface.
206 * @param color the color the pixel should be in.
207 */
208 inline void SDLputPixelAlpha(SDL_Surface* surface, int x, int y, const Color& color)
209 {
210 int bpp = surface->format->BytesPerPixel;
211
212 SDL_LockSurface(surface);
213
214 Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
215
216 Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
217
218 switch(bpp)
219 {
220 case 1:
221 *p = pixel;
222 break;
223
224 case 2:
225 *(Uint16 *)p = SDLAlpha16(pixel, *(Uint32 *)p, color.a, surface->format);
226 break;
227
228 case 3:
229 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
230 {
231 unsigned int r = (p[0] * (255 - color.a) + color.r * color.a) >> 8;
232 unsigned int g = (p[1] * (255 - color.a) + color.g * color.a) >> 8;
233 unsigned int b = (p[2] * (255 - color.a) + color.b * color.a) >> 8;
234
235 p[2] = b;
236 p[1] = g;
237 p[0] = r;
238 }
239 else
240 {
241 unsigned int r = (p[2] * (255 - color.a) + color.r * color.a) >> 8;
242 unsigned int g = (p[1] * (255 - color.a) + color.g * color.a) >> 8;
243 unsigned int b = (p[0] * (255 - color.a) + color.b * color.a) >> 8;
244
245 p[0] = b;
246 p[1] = g;
247 p[2] = r;
248 }
249 break;
250
251 case 4:
252 *(Uint32 *)p = SDLAlpha32(pixel, *(Uint32 *)p, color.a);
253 break;
254 }
255
256 SDL_UnlockSurface(surface);
257 }
258 }
259
260 #endif // end GCN_SDLPIXEL_HPP