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[libpng16] Fix copyright in sse code, use C-style comments

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This commit is contained in:
Glenn Randers-Pehrson
2016-02-19 09:46:51 -06:00
parent d06d66e899
commit 52846504da
7 changed files with 119 additions and 92 deletions
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22
contrib/intel/intel_init.c
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@@ -2,6 +2,9 @@
/* intel_init.c - SSE2 optimized filter functions
*
* Copyright (c) 2016 Google, Inc.
* Written by Mike Klein and Matt Sarett
* Derived from arm/arm_init.c, which was
* Copyright (c) 2014 Glenn Randers-Pehrson
*
* Last changed in libpng 1.6.22 [(PENDING RELEASE)]
*
@@ -18,13 +21,14 @@
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.
/* 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.
*/
if (bpp == 3)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_sse2;
@@ -40,7 +44,9 @@ png_init_filter_functions_sse2(png_structp pp, unsigned int bpp)
png_read_filter_row_paeth4_sse2;
}
// No need optimize PNG_FILTER_VALUE_UP. The compiler should autovectorize.
/* No need optimize PNG_FILTER_VALUE_UP. The compiler should
* autovectorize.
*/
}
#endif /* PNG_INTEL_SSE_IMPLEMENTATION > 0 */