mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-12-11 21:32:17 +00:00
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
|
|
/* intel_init.c - SSE2 optimized filter functions
|
|
*
|
|
* Copyright (c) 2018 Cosmin Truta
|
|
* Copyright (c) 2016-2017 Glenn Randers-Pehrson
|
|
* Written by Mike Klein and Matt Sarett, Google, Inc.
|
|
* Derived from arm/arm_init.c
|
|
*
|
|
* This code is released under the libpng license.
|
|
* For conditions of distribution and use, see the disclaimer
|
|
* and license in png.h
|
|
*/
|
|
|
|
#include "../pngpriv.h"
|
|
|
|
#ifdef PNG_READ_SUPPORTED
|
|
#if PNG_INTEL_SSE_IMPLEMENTATION > 0
|
|
|
|
void
|
|
png_init_filter_functions_sse2(png_structp pp, unsigned int bpp)
|
|
{
|
|
/* The techniques used to implement each of these filters in SSE operate on
|
|
* one pixel at a time.
|
|
* So they generally speed up 3bpp images about 3x, 4bpp images about 4x.
|
|
* They can scale up to 6 and 8 bpp images and down to 2 bpp images,
|
|
* but they'd not likely have any benefit for 1bpp images.
|
|
* Most of these can be implemented using only MMX and 64-bit registers,
|
|
* but they end up a bit slower than using the equally-ubiquitous SSE2.
|
|
*/
|
|
png_debug(1, "in png_init_filter_functions_sse2");
|
|
if (bpp == 3)
|
|
{
|
|
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_sse2;
|
|
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_sse2;
|
|
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
|
|
png_read_filter_row_paeth3_sse2;
|
|
}
|
|
else if (bpp == 4)
|
|
{
|
|
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_sse2;
|
|
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_sse2;
|
|
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
|
|
png_read_filter_row_paeth4_sse2;
|
|
}
|
|
|
|
/* No need optimize PNG_FILTER_VALUE_UP. The compiler should
|
|
* autovectorize.
|
|
*/
|
|
}
|
|
|
|
#endif /* PNG_INTEL_SSE_IMPLEMENTATION > 0 */
|
|
#endif /* PNG_READ_SUPPORTED */
|