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 Naess�n and Per Larsson
*
*
* Per Larsson a.k.a finalman
* Olof Naess�n 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
|
