diff options
Diffstat (limited to 'gfx/2d/ConvolutionFilterSSE2.cpp')
-rw-r--r-- | gfx/2d/ConvolutionFilterSSE2.cpp | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/gfx/2d/ConvolutionFilterSSE2.cpp b/gfx/2d/ConvolutionFilterSSE2.cpp new file mode 100644 index 0000000000..c0aadb2245 --- /dev/null +++ b/gfx/2d/ConvolutionFilterSSE2.cpp @@ -0,0 +1,304 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +// Copyright (c) 2011-2016 Google Inc. +// Use of this source code is governed by a BSD-style license that can be +// found in the gfx/skia/LICENSE file. + +#include "SkConvolver.h" +#include "mozilla/Attributes.h" +#include <immintrin.h> + +namespace skia { + +static MOZ_ALWAYS_INLINE void AccumRemainder( + const unsigned char* pixelsLeft, + const SkConvolutionFilter1D::ConvolutionFixed* filterValues, __m128i& accum, + int r) { + int remainder[4] = {0}; + for (int i = 0; i < r; i++) { + SkConvolutionFilter1D::ConvolutionFixed coeff = filterValues[i]; + remainder[0] += coeff * pixelsLeft[i * 4 + 0]; + remainder[1] += coeff * pixelsLeft[i * 4 + 1]; + remainder[2] += coeff * pixelsLeft[i * 4 + 2]; + remainder[3] += coeff * pixelsLeft[i * 4 + 3]; + } + __m128i t = + _mm_setr_epi32(remainder[0], remainder[1], remainder[2], remainder[3]); + accum = _mm_add_epi32(accum, t); +} + +// Convolves horizontally along a single row. The row data is given in +// |srcData| and continues for the numValues() of the filter. +void convolve_horizontally_sse2(const unsigned char* srcData, + const SkConvolutionFilter1D& filter, + unsigned char* outRow, bool /*hasAlpha*/) { + // Output one pixel each iteration, calculating all channels (RGBA) together. + int numValues = filter.numValues(); + for (int outX = 0; outX < numValues; outX++) { + // Get the filter that determines the current output pixel. + int filterOffset, filterLength; + const SkConvolutionFilter1D::ConvolutionFixed* filterValues = + filter.FilterForValue(outX, &filterOffset, &filterLength); + + // Compute the first pixel in this row that the filter affects. It will + // touch |filterLength| pixels (4 bytes each) after this. + const unsigned char* rowToFilter = &srcData[filterOffset * 4]; + + __m128i zero = _mm_setzero_si128(); + __m128i accum = _mm_setzero_si128(); + + // We will load and accumulate with four coefficients per iteration. + for (int filterX = 0; filterX < filterLength >> 2; filterX++) { + // Load 4 coefficients => duplicate 1st and 2nd of them for all channels. + __m128i coeff, coeff16; + // [16] xx xx xx xx c3 c2 c1 c0 + coeff = _mm_loadl_epi64(reinterpret_cast<const __m128i*>(filterValues)); + // [16] xx xx xx xx c1 c1 c0 c0 + coeff16 = _mm_shufflelo_epi16(coeff, _MM_SHUFFLE(1, 1, 0, 0)); + // [16] c1 c1 c1 c1 c0 c0 c0 c0 + coeff16 = _mm_unpacklo_epi16(coeff16, coeff16); + + // Load four pixels => unpack the first two pixels to 16 bits => + // multiply with coefficients => accumulate the convolution result. + // [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 + __m128i src8 = + _mm_loadu_si128(reinterpret_cast<const __m128i*>(rowToFilter)); + // [16] a1 b1 g1 r1 a0 b0 g0 r0 + __m128i src16 = _mm_unpacklo_epi8(src8, zero); + __m128i mul_hi = _mm_mulhi_epi16(src16, coeff16); + __m128i mul_lo = _mm_mullo_epi16(src16, coeff16); + // [32] a0*c0 b0*c0 g0*c0 r0*c0 + __m128i t = _mm_unpacklo_epi16(mul_lo, mul_hi); + accum = _mm_add_epi32(accum, t); + // [32] a1*c1 b1*c1 g1*c1 r1*c1 + t = _mm_unpackhi_epi16(mul_lo, mul_hi); + accum = _mm_add_epi32(accum, t); + + // Duplicate 3rd and 4th coefficients for all channels => + // unpack the 3rd and 4th pixels to 16 bits => multiply with coefficients + // => accumulate the convolution results. + // [16] xx xx xx xx c3 c3 c2 c2 + coeff16 = _mm_shufflelo_epi16(coeff, _MM_SHUFFLE(3, 3, 2, 2)); + // [16] c3 c3 c3 c3 c2 c2 c2 c2 + coeff16 = _mm_unpacklo_epi16(coeff16, coeff16); + // [16] a3 g3 b3 r3 a2 g2 b2 r2 + src16 = _mm_unpackhi_epi8(src8, zero); + mul_hi = _mm_mulhi_epi16(src16, coeff16); + mul_lo = _mm_mullo_epi16(src16, coeff16); + // [32] a2*c2 b2*c2 g2*c2 r2*c2 + t = _mm_unpacklo_epi16(mul_lo, mul_hi); + accum = _mm_add_epi32(accum, t); + // [32] a3*c3 b3*c3 g3*c3 r3*c3 + t = _mm_unpackhi_epi16(mul_lo, mul_hi); + accum = _mm_add_epi32(accum, t); + + // Advance the pixel and coefficients pointers. + rowToFilter += 16; + filterValues += 4; + } + + // When |filterLength| is not divisible by 4, we accumulate the last 1 - 3 + // coefficients one at a time. + int r = filterLength & 3; + if (r) { + int remainderOffset = (filterOffset + filterLength - r) * 4; + AccumRemainder(srcData + remainderOffset, filterValues, accum, r); + } + + // Shift right for fixed point implementation. + accum = _mm_srai_epi32(accum, SkConvolutionFilter1D::kShiftBits); + + // Packing 32 bits |accum| to 16 bits per channel (signed saturation). + accum = _mm_packs_epi32(accum, zero); + // Packing 16 bits |accum| to 8 bits per channel (unsigned saturation). + accum = _mm_packus_epi16(accum, zero); + + // Store the pixel value of 32 bits. + *(reinterpret_cast<int*>(outRow)) = _mm_cvtsi128_si32(accum); + outRow += 4; + } +} + +// Does vertical convolution to produce one output row. The filter values and +// length are given in the first two parameters. These are applied to each +// of the rows pointed to in the |sourceDataRows| array, with each row +// being |pixelWidth| wide. +// +// The output must have room for |pixelWidth * 4| bytes. +template <bool hasAlpha> +static void ConvolveVertically( + const SkConvolutionFilter1D::ConvolutionFixed* filterValues, + int filterLength, unsigned char* const* sourceDataRows, int pixelWidth, + unsigned char* outRow) { + // Output four pixels per iteration (16 bytes). + int width = pixelWidth & ~3; + __m128i zero = _mm_setzero_si128(); + for (int outX = 0; outX < width; outX += 4) { + // Accumulated result for each pixel. 32 bits per RGBA channel. + __m128i accum0 = _mm_setzero_si128(); + __m128i accum1 = _mm_setzero_si128(); + __m128i accum2 = _mm_setzero_si128(); + __m128i accum3 = _mm_setzero_si128(); + + // Convolve with one filter coefficient per iteration. + for (int filterY = 0; filterY < filterLength; filterY++) { + // Duplicate the filter coefficient 8 times. + // [16] cj cj cj cj cj cj cj cj + __m128i coeff16 = _mm_set1_epi16(filterValues[filterY]); + + // Load four pixels (16 bytes) together. + // [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 + const __m128i* src = + reinterpret_cast<const __m128i*>(&sourceDataRows[filterY][outX << 2]); + __m128i src8 = _mm_loadu_si128(src); + + // Unpack 1st and 2nd pixels from 8 bits to 16 bits for each channels => + // multiply with current coefficient => accumulate the result. + // [16] a1 b1 g1 r1 a0 b0 g0 r0 + __m128i src16 = _mm_unpacklo_epi8(src8, zero); + __m128i mul_hi = _mm_mulhi_epi16(src16, coeff16); + __m128i mul_lo = _mm_mullo_epi16(src16, coeff16); + // [32] a0 b0 g0 r0 + __m128i t = _mm_unpacklo_epi16(mul_lo, mul_hi); + accum0 = _mm_add_epi32(accum0, t); + // [32] a1 b1 g1 r1 + t = _mm_unpackhi_epi16(mul_lo, mul_hi); + accum1 = _mm_add_epi32(accum1, t); + + // Unpack 3rd and 4th pixels from 8 bits to 16 bits for each channels => + // multiply with current coefficient => accumulate the result. + // [16] a3 b3 g3 r3 a2 b2 g2 r2 + src16 = _mm_unpackhi_epi8(src8, zero); + mul_hi = _mm_mulhi_epi16(src16, coeff16); + mul_lo = _mm_mullo_epi16(src16, coeff16); + // [32] a2 b2 g2 r2 + t = _mm_unpacklo_epi16(mul_lo, mul_hi); + accum2 = _mm_add_epi32(accum2, t); + // [32] a3 b3 g3 r3 + t = _mm_unpackhi_epi16(mul_lo, mul_hi); + accum3 = _mm_add_epi32(accum3, t); + } + + // Shift right for fixed point implementation. + accum0 = _mm_srai_epi32(accum0, SkConvolutionFilter1D::kShiftBits); + accum1 = _mm_srai_epi32(accum1, SkConvolutionFilter1D::kShiftBits); + accum2 = _mm_srai_epi32(accum2, SkConvolutionFilter1D::kShiftBits); + accum3 = _mm_srai_epi32(accum3, SkConvolutionFilter1D::kShiftBits); + + // Packing 32 bits |accum| to 16 bits per channel (signed saturation). + // [16] a1 b1 g1 r1 a0 b0 g0 r0 + accum0 = _mm_packs_epi32(accum0, accum1); + // [16] a3 b3 g3 r3 a2 b2 g2 r2 + accum2 = _mm_packs_epi32(accum2, accum3); + + // Packing 16 bits |accum| to 8 bits per channel (unsigned saturation). + // [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 + accum0 = _mm_packus_epi16(accum0, accum2); + + if (hasAlpha) { + // Compute the max(ri, gi, bi) for each pixel. + // [8] xx a3 b3 g3 xx a2 b2 g2 xx a1 b1 g1 xx a0 b0 g0 + __m128i a = _mm_srli_epi32(accum0, 8); + // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 + __m128i b = _mm_max_epu8(a, accum0); // Max of r and g. + // [8] xx xx a3 b3 xx xx a2 b2 xx xx a1 b1 xx xx a0 b0 + a = _mm_srli_epi32(accum0, 16); + // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 + b = _mm_max_epu8(a, b); // Max of r and g and b. + // [8] max3 00 00 00 max2 00 00 00 max1 00 00 00 max0 00 00 00 + b = _mm_slli_epi32(b, 24); + + // Make sure the value of alpha channel is always larger than maximum + // value of color channels. + accum0 = _mm_max_epu8(b, accum0); + } else { + // Set value of alpha channels to 0xFF. + __m128i mask = _mm_set1_epi32(0xff000000); + accum0 = _mm_or_si128(accum0, mask); + } + + // Store the convolution result (16 bytes) and advance the pixel pointers. + _mm_storeu_si128(reinterpret_cast<__m128i*>(outRow), accum0); + outRow += 16; + } + + // When the width of the output is not divisible by 4, We need to save one + // pixel (4 bytes) each time. And also the fourth pixel is always absent. + int r = pixelWidth & 3; + if (r) { + __m128i accum0 = _mm_setzero_si128(); + __m128i accum1 = _mm_setzero_si128(); + __m128i accum2 = _mm_setzero_si128(); + for (int filterY = 0; filterY < filterLength; ++filterY) { + __m128i coeff16 = _mm_set1_epi16(filterValues[filterY]); + // [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 + const __m128i* src = reinterpret_cast<const __m128i*>( + &sourceDataRows[filterY][width << 2]); + __m128i src8 = _mm_loadu_si128(src); + // [16] a1 b1 g1 r1 a0 b0 g0 r0 + __m128i src16 = _mm_unpacklo_epi8(src8, zero); + __m128i mul_hi = _mm_mulhi_epi16(src16, coeff16); + __m128i mul_lo = _mm_mullo_epi16(src16, coeff16); + // [32] a0 b0 g0 r0 + __m128i t = _mm_unpacklo_epi16(mul_lo, mul_hi); + accum0 = _mm_add_epi32(accum0, t); + // [32] a1 b1 g1 r1 + t = _mm_unpackhi_epi16(mul_lo, mul_hi); + accum1 = _mm_add_epi32(accum1, t); + // [16] a3 b3 g3 r3 a2 b2 g2 r2 + src16 = _mm_unpackhi_epi8(src8, zero); + mul_hi = _mm_mulhi_epi16(src16, coeff16); + mul_lo = _mm_mullo_epi16(src16, coeff16); + // [32] a2 b2 g2 r2 + t = _mm_unpacklo_epi16(mul_lo, mul_hi); + accum2 = _mm_add_epi32(accum2, t); + } + + accum0 = _mm_srai_epi32(accum0, SkConvolutionFilter1D::kShiftBits); + accum1 = _mm_srai_epi32(accum1, SkConvolutionFilter1D::kShiftBits); + accum2 = _mm_srai_epi32(accum2, SkConvolutionFilter1D::kShiftBits); + // [16] a1 b1 g1 r1 a0 b0 g0 r0 + accum0 = _mm_packs_epi32(accum0, accum1); + // [16] a3 b3 g3 r3 a2 b2 g2 r2 + accum2 = _mm_packs_epi32(accum2, zero); + // [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 + accum0 = _mm_packus_epi16(accum0, accum2); + if (hasAlpha) { + // [8] xx a3 b3 g3 xx a2 b2 g2 xx a1 b1 g1 xx a0 b0 g0 + __m128i a = _mm_srli_epi32(accum0, 8); + // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 + __m128i b = _mm_max_epu8(a, accum0); // Max of r and g. + // [8] xx xx a3 b3 xx xx a2 b2 xx xx a1 b1 xx xx a0 b0 + a = _mm_srli_epi32(accum0, 16); + // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 + b = _mm_max_epu8(a, b); // Max of r and g and b. + // [8] max3 00 00 00 max2 00 00 00 max1 00 00 00 max0 00 00 00 + b = _mm_slli_epi32(b, 24); + accum0 = _mm_max_epu8(b, accum0); + } else { + __m128i mask = _mm_set1_epi32(0xff000000); + accum0 = _mm_or_si128(accum0, mask); + } + + for (int i = 0; i < r; i++) { + *(reinterpret_cast<int*>(outRow)) = _mm_cvtsi128_si32(accum0); + accum0 = _mm_srli_si128(accum0, 4); + outRow += 4; + } + } +} + +void convolve_vertically_sse2( + const SkConvolutionFilter1D::ConvolutionFixed* filterValues, + int filterLength, unsigned char* const* sourceDataRows, int pixelWidth, + unsigned char* outRow, bool hasAlpha) { + if (hasAlpha) { + ConvolveVertically<true>(filterValues, filterLength, sourceDataRows, + pixelWidth, outRow); + } else { + ConvolveVertically<false>(filterValues, filterLength, sourceDataRows, + pixelWidth, outRow); + } +} + +} // namespace skia |