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
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
/*
pygame - Python Game Library
Copyright (C) 2000-2001 Pete Shinners
Copyright (C) 2007 Marcus von Appen
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Pete Shinners
pete@shinners.org
*/
#ifndef SURFACE_H
#define SURFACE_H
#include <SDL.h>
#include "pygame.h"
#define PYGAME_BLEND_ADD 0x1
#define PYGAME_BLEND_SUB 0x2
#define PYGAME_BLEND_MULT 0x3
#define PYGAME_BLEND_MIN 0x4
#define PYGAME_BLEND_MAX 0x5
#define PYGAME_BLEND_RGB_ADD 0x1
#define PYGAME_BLEND_RGB_SUB 0x2
#define PYGAME_BLEND_RGB_MULT 0x3
#define PYGAME_BLEND_RGB_MIN 0x4
#define PYGAME_BLEND_RGB_MAX 0x5
#define PYGAME_BLEND_RGBA_ADD 0x6
#define PYGAME_BLEND_RGBA_SUB 0x7
#define PYGAME_BLEND_RGBA_MULT 0x8
#define PYGAME_BLEND_RGBA_MIN 0x9
#define PYGAME_BLEND_RGBA_MAX 0x10
#define GET_PIXEL(pxl, bpp, source) \
switch (bpp) \
{ \
case 2: \
pxl = *((Uint16 *) (source)); \
break; \
case 4: \
pxl = *((Uint32 *) (source)); \
break; \
default: \
{ \
Uint8 *b = (Uint8 *) source; \
pxl = (SDL_BYTEORDER == SDL_LIL_ENDIAN) ? \
b[0] + (b[1] << 8) + (b[2] << 16) : \
(b[0] << 16) + (b[1] << 8) + b[2]; \
} \
break; \
}
#define GET_PIXELVALS(_sR, _sG, _sB, _sA, px, fmt) \
_sR = ((px & fmt->Rmask) >> fmt->Rshift); \
_sR = (_sR << fmt->Rloss) + (_sR >> (8 - (fmt->Rloss << 1))); \
_sG = ((px & fmt->Gmask) >> fmt->Gshift); \
_sG = (_sG << fmt->Gloss) + (_sG >> (8 - (fmt->Gloss << 1))); \
_sB = ((px & fmt->Bmask) >> fmt->Bshift); \
_sB = (_sB << fmt->Bloss) + (_sB >> (8 - (fmt->Bloss << 1))); \
if (fmt->Amask) \
{ \
_sA = ((px & fmt->Amask) >> fmt->Ashift); \
_sA = (_sA << fmt->Aloss) + (_sA >> (8 - (fmt->Aloss << 1))); \
} \
else \
{ \
_sA = 255; \
}
#define GET_PIXELVALS_1(sr, sg, sb, sa, _src, _fmt) \
sr = _fmt->palette->colors[*((Uint8 *) (_src))].r; \
sg = _fmt->palette->colors[*((Uint8 *) (_src))].g; \
sb = _fmt->palette->colors[*((Uint8 *) (_src))].b; \
sa = 255;
#define CREATE_PIXEL(buf, r, g, b, a, bp, ft) \
switch (bp) \
{ \
case 2: \
*((Uint16 *) (buf)) = \
((r >> ft->Rloss) << ft->Rshift) | \
((g >> ft->Gloss) << ft->Gshift) | \
((b >> ft->Bloss) << ft->Bshift) | \
((a >> ft->Aloss) << ft->Ashift); \
break; \
case 4: \
*((Uint32 *) (buf)) = \
((r >> ft->Rloss) << ft->Rshift) | \
((g >> ft->Gloss) << ft->Gshift) | \
((b >> ft->Bloss) << ft->Bshift) | \
((a >> ft->Aloss) << ft->Ashift); \
break; \
}
/* Pretty good idea from Tom Duff :-). */
#define LOOP_UNROLLED4(code, n, width) \
n = (width + 3) / 4; \
switch (width & 3) \
{ \
case 0: do { code; \
case 3: code; \
case 2: code; \
case 1: code; \
} while (--n > 0); \
}
/* Used in the srcbpp == dstbpp == 1 blend functions */
#define REPEAT_3(code) \
code; \
code; \
code;
#define REPEAT_4(code) \
code; \
code; \
code; \
code;
#define BLEND_ADD(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR + sR; dR = (tmp <= 255 ? tmp : 255); \
tmp = dG + sG; dG = (tmp <= 255 ? tmp : 255); \
tmp = dB + sB; dB = (tmp <= 255 ? tmp : 255);
#define BLEND_SUB(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR - sR; dR = (tmp >= 0 ? tmp : 0); \
tmp = dG - sG; dG = (tmp >= 0 ? tmp : 0); \
tmp = dB - sB; dB = (tmp >= 0 ? tmp : 0);
#define BLEND_MULT(sR, sG, sB, sA, dR, dG, dB, dA) \
dR = (dR && sR) ? (dR * sR) >> 8 : 0; \
dG = (dG && sG) ? (dG * sG) >> 8 : 0; \
dB = (dB && sB) ? (dB * sB) >> 8 : 0;
#define BLEND_MIN(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR < dR) { dR = sR; } \
if(sG < dG) { dG = sG; } \
if(sB < dB) { dB = sB; }
#define BLEND_MAX(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR > dR) { dR = sR; } \
if(sG > dG) { dG = sG; } \
if(sB > dB) { dB = sB; }
#define BLEND_RGBA_ADD(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR + sR; dR = (tmp <= 255 ? tmp : 255); \
tmp = dG + sG; dG = (tmp <= 255 ? tmp : 255); \
tmp = dB + sB; dB = (tmp <= 255 ? tmp : 255); \
tmp = dA + sA; dA = (tmp <= 255 ? tmp : 255);
#define BLEND_RGBA_SUB(tmp, sR, sG, sB, sA, dR, dG, dB, dA) \
tmp = dR - sR; dR = (tmp >= 0 ? tmp : 0); \
tmp = dG - sG; dG = (tmp >= 0 ? tmp : 0); \
tmp = dB - sB; dB = (tmp >= 0 ? tmp : 0); \
tmp = dA - sA; dA = (tmp >= 0 ? tmp : 0);
#define BLEND_RGBA_MULT(sR, sG, sB, sA, dR, dG, dB, dA) \
dR = (dR && sR) ? (dR * sR) >> 8 : 0; \
dG = (dG && sG) ? (dG * sG) >> 8 : 0; \
dB = (dB && sB) ? (dB * sB) >> 8 : 0; \
dA = (dA && sA) ? (dA * sA) >> 8 : 0;
#define BLEND_RGBA_MIN(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR < dR) { dR = sR; } \
if(sG < dG) { dG = sG; } \
if(sB < dB) { dB = sB; } \
if(sA < dA) { dA = sA; }
#define BLEND_RGBA_MAX(sR, sG, sB, sA, dR, dG, dB, dA) \
if(sR > dR) { dR = sR; } \
if(sG > dG) { dG = sG; } \
if(sB > dB) { dB = sB; } \
if(sA > dA) { dA = sA; }
#if 1
/* Choose an alpha blend equation. If the sign is preserved on a right shift
* then use a specialized, faster, equation. Otherwise a more general form,
* where all additions are done before the shift, is needed.
*/
#if (-1 >> 1) < 0
#define ALPHA_BLEND_COMP(sC, dC, dA) ((((sC - dC) * sA + sC) >> 8) + dC)
#else
#define ALPHA_BLEND_COMP(sC, dC, dA) (((dC << 8) + (sC - dC) * sA + sC) >> 8)
#endif
#define ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB, dA) \
do { \
if (dA) \
{ \
dR = ALPHA_BLEND_COMP(sR, dR, dA); \
dG = ALPHA_BLEND_COMP(sG, dG, dA); \
dB = ALPHA_BLEND_COMP(sB, dB, dA); \
dA = sA + dA - ((sA * dA) / 255); \
} \
else \
{ \
dR = sR; \
dG = sG; \
dB = sB; \
dA = sA; \
} \
} while(0)
#elif 0
#define ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB, dA) \
do { \
if(sA){ \
if(dA && sA < 255){ \
int dContrib = dA*(255 - sA)/255; \
dA = sA+dA - ((sA*dA)/255); \
dR = (dR*dContrib + sR*sA)/dA; \
dG = (dG*dContrib + sG*sA)/dA; \
dB = (dB*dContrib + sB*sA)/dA; \
}else{ \
dR = sR; \
dG = sG; \
dB = sB; \
dA = sA; \
} \
} \
} while(0)
#endif
int
surface_fill_blend (SDL_Surface *surface, SDL_Rect *rect, Uint32 color,
int blendargs);
int
pygame_AlphaBlit (SDL_Surface * src, SDL_Rect * srcrect,
SDL_Surface * dst, SDL_Rect * dstrect, int the_args);
int
pygame_Blit (SDL_Surface * src, SDL_Rect * srcrect,
SDL_Surface * dst, SDL_Rect * dstrect, int the_args);
#endif /* SURFACE_H */
|
