Repository navigation
Expand file tree
/
Copy pathSDL_blit.c
More file actions
289 lines (254 loc) · 8.29 KB
/
Copy pathSDL_blit.c
File metadata and controls
289 lines (254 loc) · 8.29 KB
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
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_blit_auto.h"
#include "SDL_blit_copy.h"
#include "SDL_blit_slow.h"
#include "SDL_RLEaccel_c.h"
#include "SDL_pixels_c.h"
/* The general purpose software blit routine */
static int SDLCALL SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect)
{
int okay;
int src_locked;
int dst_locked;
/* Everything is okay at the beginning... */
okay = 1;
/* Lock the destination if it's in hardware */
dst_locked = 0;
if (SDL_MUSTLOCK(dst)) {
if (SDL_LockSurface(dst) < 0) {
okay = 0;
} else {
dst_locked = 1;
}
}
/* Lock the source if it's in hardware */
src_locked = 0;
if (SDL_MUSTLOCK(src)) {
if (SDL_LockSurface(src) < 0) {
okay = 0;
} else {
src_locked = 1;
}
}
/* Set up source and destination buffer pointers, and BLIT! */
if (okay && !SDL_RectEmpty(srcrect)) {
SDL_BlitFunc RunBlit;
SDL_BlitInfo *info = &src->map->info;
/* Set up the blit information */
info->src = (Uint8 *)src->pixels +
(Uint16)srcrect->y * src->pitch +
(Uint16)srcrect->x * info->src_fmt->BytesPerPixel;
info->src_w = srcrect->w;
info->src_h = srcrect->h;
info->src_pitch = src->pitch;
info->src_skip =
info->src_pitch - info->src_w * info->src_fmt->BytesPerPixel;
info->dst =
(Uint8 *)dst->pixels + (Uint16)dstrect->y * dst->pitch +
(Uint16)dstrect->x * info->dst_fmt->BytesPerPixel;
info->dst_w = dstrect->w;
info->dst_h = dstrect->h;
info->dst_pitch = dst->pitch;
info->dst_skip =
info->dst_pitch - info->dst_w * info->dst_fmt->BytesPerPixel;
RunBlit = (SDL_BlitFunc)src->map->data;
/* Run the actual software blit */
RunBlit(info);
}
/* We need to unlock the surfaces if they're locked */
if (dst_locked) {
SDL_UnlockSurface(dst);
}
if (src_locked) {
SDL_UnlockSurface(src);
}
/* Blit is done! */
return okay ? 0 : -1;
}
#if SDL_HAVE_BLIT_AUTO
#ifdef __MACOSX__
#include <sys/sysctl.h>
static SDL_bool SDL_UseAltivecPrefetch(void)
{
const char key[] = "hw.l3cachesize";
u_int64_t result = 0;
size_t typeSize = sizeof(result);
if (sysctlbyname(key, &result, &typeSize, NULL, 0) == 0 && result > 0) {
return SDL_TRUE;
} else {
return SDL_FALSE;
}
}
#else
static SDL_bool SDL_UseAltivecPrefetch(void)
{
/* Just guess G4 */
return SDL_TRUE;
}
#endif /* __MACOSX__ */
static SDL_BlitFunc SDL_ChooseBlitFunc(Uint32 src_format, Uint32 dst_format, int flags,
SDL_BlitFuncEntry *entries)
{
int i, flagcheck = (flags & (SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | SDL_COPY_MUL | SDL_COPY_COLORKEY | SDL_COPY_NEAREST));
static int features = 0x7fffffff;
/* Get the available CPU features */
if (features == 0x7fffffff) {
const char *override = SDL_getenv("SDL_BLIT_CPU_FEATURES");
features = SDL_CPU_ANY;
/* Allow an override for testing .. */
if (override) {
(void)SDL_sscanf(override, "%u", &features);
} else {
if (SDL_HasMMX()) {
features |= SDL_CPU_MMX;
}
if (SDL_Has3DNow()) {
features |= SDL_CPU_3DNOW;
}
if (SDL_HasSSE()) {
features |= SDL_CPU_SSE;
}
if (SDL_HasSSE2()) {
features |= SDL_CPU_SSE2;
}
if (SDL_HasAltiVec()) {
if (SDL_UseAltivecPrefetch()) {
features |= SDL_CPU_ALTIVEC_PREFETCH;
} else {
features |= SDL_CPU_ALTIVEC_NOPREFETCH;
}
}
}
}
for (i = 0; entries[i].func; ++i) {
/* Check for matching pixel formats */
if (src_format != entries[i].src_format) {
continue;
}
if (dst_format != entries[i].dst_format) {
continue;
}
/* Check flags */
if ((flagcheck & entries[i].flags) != flagcheck) {
continue;
}
/* Check CPU features */
if ((entries[i].cpu & features) != entries[i].cpu) {
continue;
}
/* We found the best one! */
return entries[i].func;
}
return NULL;
}
#endif /* SDL_HAVE_BLIT_AUTO */
/* Figure out which of many blit routines to set up on a surface */
int SDL_CalculateBlit(SDL_Surface *surface)
{
SDL_BlitFunc blit = NULL;
SDL_BlitMap *map = surface->map;
SDL_Surface *dst = map->dst;
/* We don't currently support blitting to < 8 bpp surfaces */
if (dst->format->BitsPerPixel < 8) {
SDL_InvalidateMap(map);
return SDL_SetError("Blit combination not supported");
}
#if SDL_HAVE_RLE
/* Clean everything out to start */
if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
SDL_UnRLESurface(surface, 1);
}
#endif
map->blit = SDL_SoftBlit;
map->info.src_fmt = surface->format;
map->info.src_pitch = surface->pitch;
map->info.dst_fmt = dst->format;
map->info.dst_pitch = dst->pitch;
#if SDL_HAVE_RLE
/* See if we can do RLE acceleration */
if (map->info.flags & SDL_COPY_RLE_DESIRED) {
if (SDL_RLESurface(surface) == 0) {
return 0;
}
}
#endif
/* Choose a standard blit function */
if (map->identity && !(map->info.flags & ~SDL_COPY_RLE_DESIRED)) {
blit = SDL_BlitCopy;
} else if (surface->format->Rloss > 8 || dst->format->Rloss > 8) {
blit = SDL_Blit_Slow;
}
#if SDL_HAVE_BLIT_0
else if (surface->format->BitsPerPixel < 8 &&
SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) {
blit = SDL_CalculateBlit0(surface);
}
#endif
#if SDL_HAVE_BLIT_1
else if (surface->format->BytesPerPixel == 1 &&
SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) {
blit = SDL_CalculateBlit1(surface);
}
#endif
#if SDL_HAVE_BLIT_A
else if (map->info.flags & SDL_COPY_BLEND) {
blit = SDL_CalculateBlitA(surface);
}
#endif
#if SDL_HAVE_BLIT_N
else {
blit = SDL_CalculateBlitN(surface);
}
#endif
#if SDL_HAVE_BLIT_AUTO
if (!blit) {
Uint32 src_format = surface->format->format;
Uint32 dst_format = dst->format->format;
blit =
SDL_ChooseBlitFunc(src_format, dst_format, map->info.flags,
SDL_GeneratedBlitFuncTable);
}
#endif
#ifndef TEST_SLOW_BLIT
if (!blit)
#endif
{
Uint32 src_format = surface->format->format;
Uint32 dst_format = dst->format->format;
if (!SDL_ISPIXELFORMAT_INDEXED(src_format) &&
!SDL_ISPIXELFORMAT_FOURCC(src_format) &&
!SDL_ISPIXELFORMAT_INDEXED(dst_format) &&
!SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
blit = SDL_Blit_Slow;
}
}
map->data = blit;
/* Make sure we have a blit function */
if (!blit) {
SDL_InvalidateMap(map);
return SDL_SetError("Blit combination not supported");
}
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */