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| author | thestig <thestig@chromium.org> | 2016-08-03 16:29:18 -0700 |
|---|---|---|
| committer | Commit bot <commit-bot@chromium.org> | 2016-08-03 16:29:18 -0700 |
| commit | 6d5c56b44d1821a715f4496668373ac6d1f1d3c6 (patch) | |
| tree | 8eea2b264c779be6c35ddaa33f1496dd73300167 /third_party/libpng16/contrib/intel/intel_init.c | |
| parent | 96a07863120273c8b89cba0e7d53ef29ae56d580 (diff) | |
| download | pdfium-6d5c56b44d1821a715f4496668373ac6d1f1d3c6.tar.xz | |
Update libpng to 1.6.22.
Sync up with Chromium's copy of libpng.
Review-Url: https://codereview.chromium.org/2132263002
Diffstat (limited to 'third_party/libpng16/contrib/intel/intel_init.c')
| -rw-r--r-- | third_party/libpng16/contrib/intel/intel_init.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/third_party/libpng16/contrib/intel/intel_init.c b/third_party/libpng16/contrib/intel/intel_init.c new file mode 100644 index 0000000000..328e90e9af --- /dev/null +++ b/third_party/libpng16/contrib/intel/intel_init.c @@ -0,0 +1,54 @@ + +/* 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) 2014,2016 Glenn Randers-Pehrson + * + * Last changed in libpng 1.6.22 [May 26, 2016] + * + * 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 */ |