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287 lines
12 KiB
C++
287 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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// Copyright (c) 2011-2016 Google Inc.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the gfx/skia/LICENSE file.
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#include "SkConvolver.h"
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#include "mozilla/Attributes.h"
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#include <arm_neon.h>
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namespace skia {
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static MOZ_ALWAYS_INLINE void AccumRemainder(
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const unsigned char* pixelsLeft,
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const SkConvolutionFilter1D::ConvolutionFixed* filterValues,
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int32x4_t& accum, int r) {
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int remainder[4] = {0};
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for (int i = 0; i < r; i++) {
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SkConvolutionFilter1D::ConvolutionFixed coeff = filterValues[i];
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remainder[0] += coeff * pixelsLeft[i * 4 + 0];
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remainder[1] += coeff * pixelsLeft[i * 4 + 1];
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remainder[2] += coeff * pixelsLeft[i * 4 + 2];
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remainder[3] += coeff * pixelsLeft[i * 4 + 3];
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}
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int32x4_t t = {remainder[0], remainder[1], remainder[2], remainder[3]};
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accum += t;
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}
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// Convolves horizontally along a single row. The row data is given in
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// |srcData| and continues for the numValues() of the filter.
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void convolve_horizontally_neon(const unsigned char* srcData,
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const SkConvolutionFilter1D& filter,
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unsigned char* outRow, bool /*hasAlpha*/) {
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// Loop over each pixel on this row in the output image.
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int numValues = filter.numValues();
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for (int outX = 0; outX < numValues; outX++) {
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uint8x8_t coeff_mask0 = vcreate_u8(0x0100010001000100);
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uint8x8_t coeff_mask1 = vcreate_u8(0x0302030203020302);
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uint8x8_t coeff_mask2 = vcreate_u8(0x0504050405040504);
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uint8x8_t coeff_mask3 = vcreate_u8(0x0706070607060706);
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// Get the filter that determines the current output pixel.
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int filterOffset, filterLength;
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const SkConvolutionFilter1D::ConvolutionFixed* filterValues =
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filter.FilterForValue(outX, &filterOffset, &filterLength);
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// Compute the first pixel in this row that the filter affects. It will
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// touch |filterLength| pixels (4 bytes each) after this.
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const unsigned char* rowToFilter = &srcData[filterOffset * 4];
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// Apply the filter to the row to get the destination pixel in |accum|.
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int32x4_t accum = vdupq_n_s32(0);
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for (int filterX = 0; filterX < filterLength >> 2; filterX++) {
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// Load 4 coefficients
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int16x4_t coeffs, coeff0, coeff1, coeff2, coeff3;
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coeffs = vld1_s16(filterValues);
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coeff0 = vreinterpret_s16_u8(
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vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask0));
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coeff1 = vreinterpret_s16_u8(
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vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask1));
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coeff2 = vreinterpret_s16_u8(
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vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask2));
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coeff3 = vreinterpret_s16_u8(
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vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask3));
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// Load pixels and calc
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uint8x16_t pixels = vld1q_u8(rowToFilter);
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int16x8_t p01_16 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(pixels)));
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int16x8_t p23_16 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(pixels)));
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int16x4_t p0_src = vget_low_s16(p01_16);
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int16x4_t p1_src = vget_high_s16(p01_16);
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int16x4_t p2_src = vget_low_s16(p23_16);
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int16x4_t p3_src = vget_high_s16(p23_16);
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int32x4_t p0 = vmull_s16(p0_src, coeff0);
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int32x4_t p1 = vmull_s16(p1_src, coeff1);
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int32x4_t p2 = vmull_s16(p2_src, coeff2);
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int32x4_t p3 = vmull_s16(p3_src, coeff3);
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accum += p0;
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accum += p1;
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accum += p2;
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accum += p3;
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// Advance the pointers
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rowToFilter += 16;
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filterValues += 4;
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}
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int r = filterLength & 3;
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if (r) {
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int remainder_offset = (filterOffset + filterLength - r) * 4;
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AccumRemainder(srcData + remainder_offset, filterValues, accum, r);
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}
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// Bring this value back in range. All of the filter scaling factors
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// are in fixed point with kShiftBits bits of fractional part.
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accum = vshrq_n_s32(accum, SkConvolutionFilter1D::kShiftBits);
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// Pack and store the new pixel.
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int16x4_t accum16 = vqmovn_s32(accum);
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uint8x8_t accum8 = vqmovun_s16(vcombine_s16(accum16, accum16));
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vst1_lane_u32(reinterpret_cast<uint32_t*>(outRow),
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vreinterpret_u32_u8(accum8), 0);
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outRow += 4;
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}
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}
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// Does vertical convolution to produce one output row. The filter values and
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// length are given in the first two parameters. These are applied to each
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// of the rows pointed to in the |sourceDataRows| array, with each row
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// being |pixelWidth| wide.
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//
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// The output must have room for |pixelWidth * 4| bytes.
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template <bool hasAlpha>
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static void ConvolveVertically(
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const SkConvolutionFilter1D::ConvolutionFixed* filterValues,
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int filterLength, unsigned char* const* sourceDataRows, int pixelWidth,
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unsigned char* outRow) {
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int width = pixelWidth & ~3;
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// Output four pixels per iteration (16 bytes).
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for (int outX = 0; outX < width; outX += 4) {
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// Accumulated result for each pixel. 32 bits per RGBA channel.
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int32x4_t accum0 = vdupq_n_s32(0);
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int32x4_t accum1 = vdupq_n_s32(0);
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int32x4_t accum2 = vdupq_n_s32(0);
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int32x4_t accum3 = vdupq_n_s32(0);
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// Convolve with one filter coefficient per iteration.
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for (int filterY = 0; filterY < filterLength; filterY++) {
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// Duplicate the filter coefficient 4 times.
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// [16] cj cj cj cj
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int16x4_t coeff16 = vdup_n_s16(filterValues[filterY]);
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// Load four pixels (16 bytes) together.
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// [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0
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uint8x16_t src8 = vld1q_u8(&sourceDataRows[filterY][outX << 2]);
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int16x8_t src16_01 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(src8)));
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int16x8_t src16_23 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(src8)));
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int16x4_t src16_0 = vget_low_s16(src16_01);
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int16x4_t src16_1 = vget_high_s16(src16_01);
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int16x4_t src16_2 = vget_low_s16(src16_23);
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int16x4_t src16_3 = vget_high_s16(src16_23);
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accum0 += vmull_s16(src16_0, coeff16);
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accum1 += vmull_s16(src16_1, coeff16);
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accum2 += vmull_s16(src16_2, coeff16);
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accum3 += vmull_s16(src16_3, coeff16);
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}
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// Shift right for fixed point implementation.
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accum0 = vshrq_n_s32(accum0, SkConvolutionFilter1D::kShiftBits);
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accum1 = vshrq_n_s32(accum1, SkConvolutionFilter1D::kShiftBits);
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accum2 = vshrq_n_s32(accum2, SkConvolutionFilter1D::kShiftBits);
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accum3 = vshrq_n_s32(accum3, SkConvolutionFilter1D::kShiftBits);
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// Packing 32 bits |accum| to 16 bits per channel (signed saturation).
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// [16] a1 b1 g1 r1 a0 b0 g0 r0
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int16x8_t accum16_0 = vcombine_s16(vqmovn_s32(accum0), vqmovn_s32(accum1));
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// [16] a3 b3 g3 r3 a2 b2 g2 r2
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int16x8_t accum16_1 = vcombine_s16(vqmovn_s32(accum2), vqmovn_s32(accum3));
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// Packing 16 bits |accum| to 8 bits per channel (unsigned saturation).
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// [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0
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uint8x16_t accum8 =
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vcombine_u8(vqmovun_s16(accum16_0), vqmovun_s16(accum16_1));
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if (hasAlpha) {
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// Compute the max(ri, gi, bi) for each pixel.
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// [8] xx a3 b3 g3 xx a2 b2 g2 xx a1 b1 g1 xx a0 b0 g0
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uint8x16_t a =
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vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 8));
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// [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0
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uint8x16_t b = vmaxq_u8(a, accum8); // Max of r and g
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// [8] xx xx a3 b3 xx xx a2 b2 xx xx a1 b1 xx xx a0 b0
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a = vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 16));
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// [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0
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b = vmaxq_u8(a, b); // Max of r and g and b.
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// [8] max3 00 00 00 max2 00 00 00 max1 00 00 00 max0 00 00 00
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b = vreinterpretq_u8_u32(vshlq_n_u32(vreinterpretq_u32_u8(b), 24));
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// Make sure the value of alpha channel is always larger than maximum
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// value of color channels.
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accum8 = vmaxq_u8(b, accum8);
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} else {
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// Set value of alpha channels to 0xFF.
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accum8 = vreinterpretq_u8_u32(vreinterpretq_u32_u8(accum8) |
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vdupq_n_u32(0xFF000000));
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}
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// Store the convolution result (16 bytes) and advance the pixel pointers.
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vst1q_u8(outRow, accum8);
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outRow += 16;
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}
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// Process the leftovers when the width of the output is not divisible
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// by 4, that is at most 3 pixels.
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int r = pixelWidth & 3;
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if (r) {
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int32x4_t accum0 = vdupq_n_s32(0);
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int32x4_t accum1 = vdupq_n_s32(0);
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int32x4_t accum2 = vdupq_n_s32(0);
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for (int filterY = 0; filterY < filterLength; ++filterY) {
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int16x4_t coeff16 = vdup_n_s16(filterValues[filterY]);
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// [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0
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uint8x16_t src8 = vld1q_u8(&sourceDataRows[filterY][width << 2]);
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int16x8_t src16_01 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(src8)));
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int16x8_t src16_23 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(src8)));
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int16x4_t src16_0 = vget_low_s16(src16_01);
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int16x4_t src16_1 = vget_high_s16(src16_01);
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int16x4_t src16_2 = vget_low_s16(src16_23);
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accum0 += vmull_s16(src16_0, coeff16);
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accum1 += vmull_s16(src16_1, coeff16);
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accum2 += vmull_s16(src16_2, coeff16);
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}
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accum0 = vshrq_n_s32(accum0, SkConvolutionFilter1D::kShiftBits);
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accum1 = vshrq_n_s32(accum1, SkConvolutionFilter1D::kShiftBits);
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accum2 = vshrq_n_s32(accum2, SkConvolutionFilter1D::kShiftBits);
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int16x8_t accum16_0 = vcombine_s16(vqmovn_s32(accum0), vqmovn_s32(accum1));
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int16x8_t accum16_1 = vcombine_s16(vqmovn_s32(accum2), vqmovn_s32(accum2));
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uint8x16_t accum8 =
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vcombine_u8(vqmovun_s16(accum16_0), vqmovun_s16(accum16_1));
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if (hasAlpha) {
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// Compute the max(ri, gi, bi) for each pixel.
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// [8] xx a3 b3 g3 xx a2 b2 g2 xx a1 b1 g1 xx a0 b0 g0
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uint8x16_t a =
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vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 8));
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// [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0
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uint8x16_t b = vmaxq_u8(a, accum8); // Max of r and g
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// [8] xx xx a3 b3 xx xx a2 b2 xx xx a1 b1 xx xx a0 b0
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a = vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 16));
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// [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0
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b = vmaxq_u8(a, b); // Max of r and g and b.
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// [8] max3 00 00 00 max2 00 00 00 max1 00 00 00 max0 00 00 00
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b = vreinterpretq_u8_u32(vshlq_n_u32(vreinterpretq_u32_u8(b), 24));
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// Make sure the value of alpha channel is always larger than maximum
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// value of color channels.
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accum8 = vmaxq_u8(b, accum8);
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} else {
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// Set value of alpha channels to 0xFF.
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accum8 = vreinterpretq_u8_u32(vreinterpretq_u32_u8(accum8) |
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vdupq_n_u32(0xFF000000));
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}
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switch (r) {
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case 1:
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vst1q_lane_u32(reinterpret_cast<uint32_t*>(outRow),
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vreinterpretq_u32_u8(accum8), 0);
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break;
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case 2:
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vst1_u32(reinterpret_cast<uint32_t*>(outRow),
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vreinterpret_u32_u8(vget_low_u8(accum8)));
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break;
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case 3:
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vst1_u32(reinterpret_cast<uint32_t*>(outRow),
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vreinterpret_u32_u8(vget_low_u8(accum8)));
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vst1q_lane_u32(reinterpret_cast<uint32_t*>(outRow + 8),
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vreinterpretq_u32_u8(accum8), 2);
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break;
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}
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}
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}
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void convolve_vertically_neon(
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const SkConvolutionFilter1D::ConvolutionFixed* filterValues,
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int filterLength, unsigned char* const* sourceDataRows, int pixelWidth,
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unsigned char* outRow, bool hasAlpha) {
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if (hasAlpha) {
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ConvolveVertically<true>(filterValues, filterLength, sourceDataRows,
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pixelWidth, outRow);
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} else {
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ConvolveVertically<false>(filterValues, filterLength, sourceDataRows,
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pixelWidth, outRow);
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}
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}
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} // namespace skia
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