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