From 424621e3129f7029283f72e953fe0c69f982d257 Mon Sep 17 00:00:00 2001 From: Lei Zhang Date: Tue, 4 Sep 2018 22:42:56 +0000 Subject: Revert "Update libpng from 1.6.22 -> 1.6.34" This reverts commit 6b2e2f0ec7c5f629c5270d14c2339197af7392d8. Reason for revert: Broke Chromium integration. Original change's description: > Update libpng from 1.6.22 -> 1.6.34 > > Updates third_party/libpng16 to Chromium's third_party/libpng @ > e87a02987101e2dbe319a4aba6b52470f7624b4a and applies PDFium specific > patches. > > BUG=chromium:880322 > > Change-Id: I6724f55099c70a79da6d6e4863b9c6c9157ec571 > Reviewed-on: https://pdfium-review.googlesource.com/41910 > Reviewed-by: Lei Zhang > Commit-Queue: Ryan Harrison TBR=thestig@chromium.org,rharrison@chromium.org Change-Id: I2fd1f78e5d07ca983b2430bf078544185292ee1d No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: chromium:880322 Reviewed-on: https://pdfium-review.googlesource.com/41970 Reviewed-by: Lei Zhang Commit-Queue: Lei Zhang --- third_party/libpng16/contrib/intel/intel_init.c | 54 +++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 third_party/libpng16/contrib/intel/intel_init.c (limited to 'third_party/libpng16/contrib/intel/intel_init.c') 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 */ -- cgit v1.2.3