This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_draw.h
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
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_blit.h"
/* This code assumes that r, g, b, a are the source color,
* and in the blend and add case, the RGB values are premultiplied by a.
*/
#define DRAW_MUL(_a, _b) (((unsigned)(_a)*(_b))/255)
32
#define DRAW_FASTSETPIXEL(x, y, type, bpp, color) \
33
*(type *)((Uint8 *)dst->pixels + y * dst->pitch + x * bpp) = (type) color
34
35
36
37
38
#define DRAW_FASTSETPIXEL1(x, y) DRAW_FASTSETPIXEL(x, y, Uint8, 1, color);
#define DRAW_FASTSETPIXEL2(x, y) DRAW_FASTSETPIXEL(x, y, Uint16, 2, color);
#define DRAW_FASTSETPIXEL4(x, y) DRAW_FASTSETPIXEL(x, y, Uint32, 4, color);
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
#define DRAW_SETPIXEL(setpixel) \
do { \
unsigned sr = r, sg = g, sb = b, sa = a; \
setpixel; \
} while (0)
#define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
do { \
unsigned sr, sg, sb, sa; sa; \
getpixel; \
sr = DRAW_MUL(inva, sr) + r; \
sg = DRAW_MUL(inva, sg) + g; \
sb = DRAW_MUL(inva, sb) + b; \
setpixel; \
} while (0)
#define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
do { \
unsigned sr, sg, sb, sa; sa; \
getpixel; \
sr += r; if (sr > 0xff) sr = 0xff; \
sg += g; if (sg > 0xff) sg = 0xff; \
sb += b; if (sb > 0xff) sb = 0xff; \
setpixel; \
} while (0)
#define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
do { \
unsigned sr, sg, sb, sa; sa; \
getpixel; \
sr = DRAW_MUL(sr, r); \
sg = DRAW_MUL(sg, g); \
sb = DRAW_MUL(sb, b); \
setpixel; \
} while (0)
#define DRAW_SETPIXELXY(x, y, type, bpp, op) \
do { \
77
type *pixel = (type *)((Uint8 *)dst->pixels + y * dst->pitch + x * bpp); \
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
op; \
} while (0)
/*
* Define draw operators for RGB555
*/
#define DRAW_SETPIXEL_RGB555 \
DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB555 \
DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB555 \
DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB555 \
DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXELXY_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
#define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
#define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
#define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
/*
* Define draw operators for RGB565
*/
#define DRAW_SETPIXEL_RGB565 \
DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB565 \
DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB565 \
DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB565 \
DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXELXY_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
#define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
#define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
#define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
/*
* Define draw operators for RGB888
*/
#define DRAW_SETPIXEL_RGB888 \
DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB888 \
DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB888 \
DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB888 \
DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXELXY_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
#define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
#define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
#define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
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
/*
* Define draw operators for ARGB8888
*/
#define DRAW_SETPIXEL_ARGB8888 \
DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXEL_BLEND_ARGB8888 \
DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXEL_ADD_ARGB8888 \
DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXEL_MOD_ARGB8888 \
DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXELXY_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
#define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
#define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
#define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888)
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
275
276
277
278
279
280
281
282
283
284
285
/*
* Define draw operators for general RGB
*/
#define DRAW_SETPIXEL_RGB \
DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB \
DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB \
DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB \
DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXELXY2_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
#define DRAW_SETPIXELXY4_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
#define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
#define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
#define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
#define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
#define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
#define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
/*
* Define draw operators for general RGBA
*/
#define DRAW_SETPIXEL_RGBA \
DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXEL_BLEND_RGBA \
DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXEL_ADD_RGBA \
DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXEL_MOD_RGBA \
DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXELXY4_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
#define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
#define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
#define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
/*
* Define line drawing macro
*/
#define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
286
#define BRESENHAM(x1, y1, x2, y2, op, draw_end) \
288
289
290
291
int i, deltax, deltay, numpixels; \
int d, dinc1, dinc2; \
int x, xinc1, xinc2; \
int y, yinc1, yinc2; \
293
294
295
296
297
298
299
300
301
302
303
304
deltax = ABS(x2 - x1); \
deltay = ABS(y2 - y1); \
\
if (deltax >= deltay) { \
numpixels = deltax + 1; \
d = (2 * deltay) - deltax; \
dinc1 = deltay * 2; \
dinc2 = (deltay - deltax) * 2; \
xinc1 = 1; \
xinc2 = 1; \
yinc1 = 0; \
yinc2 = 1; \
305
} else { \
306
307
308
309
310
311
312
313
numpixels = deltay + 1; \
d = (2 * deltax) - deltay; \
dinc1 = deltax * 2; \
dinc2 = (deltax - deltay) * 2; \
xinc1 = 0; \
xinc2 = 1; \
yinc1 = 1; \
yinc2 = 1; \
315
316
317
318
\
if (x1 > x2) { \
xinc1 = -xinc1; \
xinc2 = -xinc2; \
320
321
322
323
324
325
326
327
if (y1 > y2) { \
yinc1 = -yinc1; \
yinc2 = -yinc2; \
} \
\
x = x1; \
y = y1; \
\
328
329
330
if (!draw_end) { \
--numpixels; \
} \
331
for (i = 0; i < numpixels; ++i) { \
332
333
334
335
336
337
338
339
340
op(x, y); \
if (d < 0) { \
d += dinc1; \
x += xinc1; \
y += yinc1; \
} else { \
d += dinc2; \
x += xinc2; \
y += yinc2; \
341
342
343
} \
} \
}
344
#define DRAWLINE BRESENHAM
347
* Define draw rect macro
348
* (not tested, this level of optimization not needed ... yet?)
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
*/
#define DRAWRECT(type, op) \
do { \
int width = rect->w; \
int height = rect->h; \
int pitch = (dst->pitch / dst->format->BytesPerPixel); \
int skip = pitch - width; \
type *pixel; \
pixel = (type *)dst->pixels + rect->y * pitch + rect->x; \
{ int n = (width+3)/4; \
switch (width & 3) { \
case 0: do { op; pixel++; \
case 3: op; pixel++; \
case 2: op; pixel++; \
case 1: op; pixel++; \
} while ( --n > 0 ); \
} \
} \
pixel += skip; \
width -= 1; \
height -= 2; \
while (height--) { \
op; pixel += width; op; pixel += skip; \
} \
{ int n = (width+3)/4; \
switch (width & 3) { \
case 0: do { op; pixel++; \
case 3: op; pixel++; \
case 2: op; pixel++; \
case 1: op; pixel++; \
} while ( --n > 0 ); \
} \
} \
} while (0)
/*
* Define fill rect macro
388
#define FILLRECT(type, op) \
390
391
int width = rect->w; \
int height = rect->h; \
392
393
int pitch = (dst->pitch / dst->format->BytesPerPixel); \
int skip = pitch - width; \
394
type *pixel = (type *)dst->pixels + rect->y * pitch + rect->x; \
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
while (height--) { \
{ int n = (width+3)/4; \
switch (width & 3) { \
case 0: do { op; pixel++; \
case 3: op; pixel++; \
case 2: op; pixel++; \
case 1: op; pixel++; \
} while ( --n > 0 ); \
} \
} \
pixel += skip; \
} \
} while (0)
/* vi: set ts=4 sw=4 expandtab: */