This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_blit_copy.c
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2009 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
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_video.h"
#include "SDL_blit.h"
26
#include "SDL_blit_copy.h"
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
#ifdef __SSE__
/* This assumes 16-byte aligned src and dst */
static __inline__ void
SDL_memcpySSE(Uint8 * dst, const Uint8 * src, int len)
{
int i;
__m128 values[4];
for (i = len / 64; i--;) {
_mm_prefetch(src, _MM_HINT_NTA);
values[0] = *(__m128 *) (src + 0);
values[1] = *(__m128 *) (src + 16);
values[2] = *(__m128 *) (src + 32);
values[3] = *(__m128 *) (src + 48);
_mm_stream_ps((float *) (dst + 0), values[0]);
_mm_stream_ps((float *) (dst + 16), values[1]);
_mm_stream_ps((float *) (dst + 32), values[2]);
_mm_stream_ps((float *) (dst + 48), values[3]);
src += 64;
dst += 64;
}
if (len & 63)
SDL_memcpy(dst, src, len & 63);
}
#endif /* __SSE__ */
57
58
59
#ifdef _MSC_VER
#pragma warning(disable:4799)
#endif
60
/* This assumes 8-byte aligned src and dst */
61
static __inline__ void
62
SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len)
66
__m64 values[8];
67
for (i = len / 64; i--;) {
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
_mm_prefetch(src, _MM_HINT_NTA);
values[0] = *(__m64 *) (src + 0);
values[1] = *(__m64 *) (src + 8);
values[2] = *(__m64 *) (src + 16);
values[3] = *(__m64 *) (src + 24);
values[4] = *(__m64 *) (src + 32);
values[5] = *(__m64 *) (src + 40);
values[6] = *(__m64 *) (src + 48);
values[7] = *(__m64 *) (src + 56);
_mm_stream_pi((__m64 *) (dst + 0), values[0]);
_mm_stream_pi((__m64 *) (dst + 8), values[1]);
_mm_stream_pi((__m64 *) (dst + 16), values[2]);
_mm_stream_pi((__m64 *) (dst + 24), values[3]);
_mm_stream_pi((__m64 *) (dst + 32), values[4]);
_mm_stream_pi((__m64 *) (dst + 40), values[5]);
_mm_stream_pi((__m64 *) (dst + 48), values[6]);
_mm_stream_pi((__m64 *) (dst + 56), values[7]);
85
86
87
src += 64;
dst += 64;
}
89
90
91
92
93
94
95
96
97
98
99
100
if (len & 63)
SDL_memcpy(dst, src, len & 63);
}
#endif /* __MMX__ */
void
SDL_BlitCopy(SDL_BlitInfo * info)
{
Uint8 *src, *dst;
int w, h;
int srcskip, dstskip;
101
w = info->dst_w * info->dst_fmt->BytesPerPixel;
102
103
104
h = info->dst_h;
src = info->src;
dst = info->dst;
105
106
srcskip = info->src_pitch;
dstskip = info->dst_pitch;
107
108
#ifdef __SSE__
109
110
111
if (SDL_HasSSE() &&
!((uintptr_t) src & 15) && !(srcskip & 15) &&
!((uintptr_t) dst & 15) && !(dstskip & 15)) {
112
113
114
115
116
117
118
119
120
121
while (h--) {
SDL_memcpySSE(dst, src, w);
src += srcskip;
dst += dstskip;
}
return;
}
#endif
#ifdef __MMX__
122
123
124
if (SDL_HasMMX() &&
!((uintptr_t) src & 7) && !(srcskip & 7) &&
!((uintptr_t) dst & 7) && !(dstskip & 7)) {
125
126
127
128
129
while (h--) {
SDL_memcpyMMX(dst, src, w);
src += srcskip;
dst += dstskip;
}
130
_mm_empty();
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
return;
}
#endif
while (h--) {
SDL_memcpy(dst, src, w);
src += srcskip;
dst += dstskip;
}
}
void
SDL_BlitCopyOverlap(SDL_BlitInfo * info)
{
Uint8 *src, *dst;
int w, h;
int skip;
149
w = info->dst_w * info->dst_fmt->BytesPerPixel;
150
151
152
h = info->dst_h;
src = info->src;
dst = info->dst;
153
skip = info->src_pitch;
154
if ((dst < src) || (dst >= (src + h * skip))) {
155
156
157
158
159
160
161
162
163
164
165
166
167
SDL_BlitCopy(info);
} else {
src += ((h - 1) * skip);
dst += ((h - 1) * skip);
while (h--) {
SDL_revcpy(dst, src, w);
src -= skip;
dst -= skip;
}
}
}
/* vi: set ts=4 sw=4 expandtab: */