SDL_blit_copy.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2019 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(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)
{
const 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;
SDL_memcpy(dst + skip, src + skip, remain);
}
}
#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: */
SDL_BlitInfo::src
Uint8 * src
Definition: SDL_blit.h:57
SDL_PixelFormat::BytesPerPixel
Uint8 BytesPerPixel
Definition: SDL_pixels.h:320
SDL_BlitInfo::src_pitch
int src_pitch
Definition: SDL_blit.h:59
SDL_BlitInfo::dst_w
int dst_w
Definition: SDL_blit.h:62
SDL_BlitInfo
Definition: SDL_blit.h:55
SDL_blit_copy.h
SDL_BlitInfo::dst_h
int dst_h
Definition: SDL_blit.h:62
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
dst
GLenum GLenum dst
Definition: SDL_opengl_glext.h:1737
values
GLenum GLsizei GLsizei GLint * values
Definition: SDL_opengl_glext.h:1486
SDL_BlitInfo::dst
Uint8 * dst
Definition: SDL_blit.h:61
len
GLenum GLsizei len
Definition: SDL_opengl_glext.h:2926
SDL_memcpy
#define SDL_memcpy
Definition: SDL_dynapi_overrides.h:387
SDL_INLINE
#define SDL_INLINE
Definition: begin_code.h:134
SDL_blit.h
SDL_memmove
#define SDL_memmove
Definition: SDL_dynapi_overrides.h:388
SDL_BlitInfo::dst_fmt
SDL_PixelFormat * dst_fmt
Definition: SDL_blit.h:66
SDL_HasMMX
#define SDL_HasMMX
Definition: SDL_dynapi_overrides.h:105
src
GLenum src
Definition: SDL_opengl_glext.h:1737
SDL_BlitInfo::dst_pitch
int dst_pitch
Definition: SDL_blit.h:63
SDL_video.h
SDL_HasSSE
#define SDL_HasSSE
Definition: SDL_dynapi_overrides.h:107
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:161
SDL_BlitCopy
void SDL_BlitCopy(SDL_BlitInfo *info)
Definition: SDL_blit_copy.c:91
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731
uintptr_t
unsigned int uintptr_t
Definition: SDL_config_windows.h:70
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:179