This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_blendpoint.c
346 lines (312 loc) · 9 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2010 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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_draw.h"
25
26
#include "SDL_blendpoint.h"
27
28
static int
29
SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
30
31
32
33
34
35
36
37
38
39
40
Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_RGB555(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_RGB555(x, y);
break;
41
42
43
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB555(x, y);
break;
44
45
46
47
48
49
50
51
default:
DRAW_SETPIXELXY_RGB555(x, y);
break;
}
return 0;
}
static int
52
SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
53
54
55
56
57
58
59
60
61
62
63
Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_RGB565(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_RGB565(x, y);
break;
64
65
66
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB565(x, y);
break;
67
68
69
70
71
72
73
74
default:
DRAW_SETPIXELXY_RGB565(x, y);
break;
}
return 0;
}
static int
75
SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
76
77
78
79
80
81
82
83
84
85
86
Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_RGB888(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_RGB888(x, y);
break;
87
88
89
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB888(x, y);
break;
90
91
92
93
94
95
96
97
default:
DRAW_SETPIXELXY_RGB888(x, y);
break;
}
return 0;
}
static int
98
SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode,
99
100
101
102
103
104
105
106
107
108
109
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_ARGB8888(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_ARGB8888(x, y);
break;
110
111
112
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_ARGB8888(x, y);
break;
113
114
115
116
117
118
119
120
default:
DRAW_SETPIXELXY_ARGB8888(x, y);
break;
}
return 0;
}
static int
121
SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
122
123
124
125
126
127
128
129
130
131
132
133
134
135
Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 2:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY2_BLEND_RGB(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY2_ADD_RGB(x, y);
break;
136
137
138
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY2_MOD_RGB(x, y);
break;
139
140
141
142
143
144
145
146
147
148
149
150
151
default:
DRAW_SETPIXELXY2_RGB(x, y);
break;
}
return 0;
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY4_BLEND_RGB(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY4_ADD_RGB(x, y);
break;
152
153
154
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY4_MOD_RGB(x, y);
break;
155
156
157
158
159
160
161
162
163
164
165
166
default:
DRAW_SETPIXELXY4_RGB(x, y);
break;
}
return 0;
default:
SDL_Unsupported();
return -1;
}
}
static int
167
SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
168
169
170
171
172
173
174
175
176
177
178
179
180
181
Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY4_BLEND_RGBA(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY4_ADD_RGBA(x, y);
break;
182
183
184
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY4_MOD_RGBA(x, y);
break;
185
186
187
188
189
190
191
192
193
194
195
196
default:
DRAW_SETPIXELXY4_RGBA(x, y);
break;
}
return 0;
default:
SDL_Unsupported();
return -1;
}
}
int
197
SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
198
199
Uint8 g, Uint8 b, Uint8 a)
{
200
201
202
203
if (!dst) {
SDL_SetError("Passed NULL destination surface");
return -1;
}
204
205
206
207
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
208
return -1;
209
210
211
212
213
214
215
216
217
}
/* Perform clipping */
if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
x >= (dst->clip_rect.x + dst->clip_rect.w) ||
y >= (dst->clip_rect.y + dst->clip_rect.h)) {
return 0;
}
218
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
219
220
221
222
223
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
224
switch (dst->format->BitsPerPixel) {
225
case 15:
226
switch (dst->format->Rmask) {
227
228
229
230
231
case 0x7C00:
return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
}
break;
case 16:
232
switch (dst->format->Rmask) {
233
234
235
236
237
case 0xF800:
return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
}
break;
case 32:
238
switch (dst->format->Rmask) {
239
case 0x00FF0000:
240
if (!dst->format->Amask) {
241
242
243
244
245
246
247
248
return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b,
a);
} else {
return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b,
a);
}
break;
}
249
break;
250
251
252
253
default:
break;
}
254
if (!dst->format->Amask) {
255
256
257
258
259
260
return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
} else {
return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
}
}
261
262
int
SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count,
263
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
264
265
266
267
268
269
{
int minx, miny;
int maxx, maxy;
int i;
int x, y;
int (*func)(SDL_Surface * dst, int x, int y,
270
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
int status = 0;
if (!dst) {
SDL_SetError("Passed NULL destination surface");
return -1;
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
SDL_SetError("SDL_BlendPoints(): Unsupported surface format");
return (-1);
}
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
/* FIXME: Does this function pointer slow things down significantly? */
switch (dst->format->BitsPerPixel) {
case 15:
switch (dst->format->Rmask) {
case 0x7C00:
func = SDL_BlendPoint_RGB555;
break;
}
break;
case 16:
switch (dst->format->Rmask) {
case 0xF800:
func = SDL_BlendPoint_RGB565;
break;
}
break;
case 32:
switch (dst->format->Rmask) {
case 0x00FF0000:
if (!dst->format->Amask) {
func = SDL_BlendPoint_RGB888;
} else {
func = SDL_BlendPoint_ARGB8888;
}
break;
}
break;
default:
break;
}
if (!func) {
if (!dst->format->Amask) {
func = SDL_BlendPoint_RGB;
} else {
func = SDL_BlendPoint_RGBA;
}
}
minx = dst->clip_rect.x;
maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
miny = dst->clip_rect.y;
maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
for (i = 0; i < count; ++i) {
x = points[i].x;
y = points[i].y;
if (x < minx || x > maxx || y < miny || y > maxy) {
continue;
}
status = func(dst, x, y, blendMode, r, g, b, a);
}
return status;
}
346
/* vi: set ts=4 sw=4 expandtab: */