Repository navigation
Expand file tree
/
Copy pathSDL_blit_copy.c
More file actions
162 lines (143 loc) · 4.1 KB
/
Copy pathSDL_blit_copy.c
File metadata and controls
162 lines (143 loc) · 4.1 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
/*
Simple DirectMedia Layer
Copyright (C) 1997-2026 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_blit.h"
#include "SDL_blit_copy.h"
#ifdef __SSE__
/* This assumes 16-byte aligned src and dst */
static SDL_INLINE void SDL_memcpySSE(Uint8 *dst, const Uint8 *src, int len)
{
int i;
__m128 values[4];
for (i = len / 64; i--;) {
_mm_prefetch((const char *)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__ */
#ifdef __MMX__
#ifdef _MSC_VER
#pragma warning(disable : 4799)
#endif
static SDL_INLINE void SDL_memcpyMMX(Uint8 *dst, const Uint8 *src, int len)
{
int remain = len & 63;
int i;
__m64 *d64 = (__m64 *)dst;
__m64 *s64 = (__m64 *)src;
for (i = len / 64; i--;) {
d64[0] = s64[0];
d64[1] = s64[1];
d64[2] = s64[2];
d64[3] = s64[3];
d64[4] = s64[4];
d64[5] = s64[5];
d64[6] = s64[6];
d64[7] = s64[7];
d64 += 8;
s64 += 8;
}
if (remain) {
const int skip = len - remain;
dst += skip;
src += skip;
while (remain--) {
*dst++ = *src++;
}
}
}
#endif /* __MMX__ */
void SDL_BlitCopy(SDL_BlitInfo *info)
{
SDL_bool overlap;
Uint8 *src, *dst;
int w, h;
int srcskip, dstskip;
w = info->dst_w * info->dst_fmt->BytesPerPixel;
h = info->dst_h;
src = info->src;
dst = info->dst;
srcskip = info->src_pitch;
dstskip = info->dst_pitch;
/* Properly handle overlapping blits */
if (src < dst) {
overlap = (dst < (src + h * srcskip));
} else {
overlap = (src < (dst + h * dstskip));
}
if (overlap) {
if (dst < src) {
while (h--) {
SDL_memmove(dst, src, w);
src += srcskip;
dst += dstskip;
}
} else {
src += ((h - 1) * srcskip);
dst += ((h - 1) * dstskip);
while (h--) {
SDL_memmove(dst, src, w);
src -= srcskip;
dst -= dstskip;
}
}
return;
}
#ifdef __SSE__
if (SDL_HasSSE() &&
!((uintptr_t)src & 15) && !(srcskip & 15) &&
!((uintptr_t)dst & 15) && !(dstskip & 15)) {
while (h--) {
SDL_memcpySSE(dst, src, w);
src += srcskip;
dst += dstskip;
}
return;
}
#endif
#ifdef __MMX__
if (SDL_HasMMX() && !(srcskip & 7) && !(dstskip & 7)) {
while (h--) {
SDL_memcpyMMX(dst, src, w);
src += srcskip;
dst += dstskip;
}
_mm_empty();
return;
}
#endif
while (h--) {
SDL_memcpy(dst, src, w);
src += srcskip;
dst += dstskip;
}
}
/* vi: set ts=4 sw=4 expandtab: */