| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkBitmapFilter_opts_DEFINED |
| #define SkBitmapFilter_opts_DEFINED |
| |
| #include "SkConvolver.h" |
| |
| #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2 |
| #include <immintrin.h> |
| #elif defined(SK_ARM_HAS_NEON) |
| #include <arm_neon.h> |
| #endif |
| |
| namespace SK_OPTS_NS { |
| |
| #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_AVX2 |
| |
| static SK_ALWAYS_INLINE |
| void compute_coefficient_row(SkConvolutionFilter1D::ConvolutionFixed filterValue, const unsigned char* sourceDataRows, |
| __m256i* accum01, __m256i* accum23, __m256i* accum45, __m256i* accum67) { |
| __m256i coefs = _mm256_set1_epi16(filterValue); |
| __m256i pixels = _mm256_loadu_si256(reinterpret_cast<const __m256i *>(sourceDataRows)); |
| __m256i zero = _mm256_setzero_si256(); |
| |
| // [16] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 |
| __m256i pixels_0123_16bit = _mm256_unpacklo_epi8(pixels, zero); |
| |
| __m256i scaled_0123_hi = _mm256_mulhi_epi16(pixels_0123_16bit, coefs), |
| scaled_0123_lo = _mm256_mullo_epi16(pixels_0123_16bit, coefs); |
| |
| // [32] c*a1 c*b1 c*g1 c*r1 c*a0 c*b0 c*g0 c*r0 |
| *accum01 = _mm256_add_epi32(*accum01, _mm256_unpacklo_epi16(scaled_0123_lo, scaled_0123_hi)); |
| // [32] c*a3 c*b3 c*g3 c*r3 c*a2 c*b2 c*g2 c*r2 |
| *accum23 = _mm256_add_epi32(*accum23, _mm256_unpackhi_epi16(scaled_0123_lo, scaled_0123_hi)); |
| |
| // [16] a7 b7 g7 r7 a6 b6 g6 r6 a5 b5 g5 r5 a4 b4 g4 r4 |
| __m256i pixels_4567_16bit = _mm256_unpackhi_epi8(pixels, zero); |
| |
| __m256i scaled_4567_hi = _mm256_mulhi_epi16(pixels_4567_16bit, coefs), |
| scaled_4567_lo = _mm256_mullo_epi16(pixels_4567_16bit, coefs); |
| |
| // [32] c*a5 c*b5 c*g5 c*r5 c*a4 c*b4 c*g4 c*r4 |
| *accum45 = _mm256_add_epi32(*accum45, _mm256_unpacklo_epi16(scaled_4567_lo, scaled_4567_hi)); |
| // [32] c*a7 c*b7 c*g7 c*r7 c*a6 c*b6 c*g6 c*r6 |
| *accum67 = _mm256_add_epi32(*accum67, _mm256_unpackhi_epi16(scaled_4567_lo, scaled_4567_hi)); |
| } |
| |
| template<bool hasAlpha> |
| void ConvolveVertically(const SkConvolutionFilter1D::ConvolutionFixed* filterValues, |
| int filterLength, |
| unsigned char* const * sourceDataRows, |
| int pixelWidth, |
| unsigned char* outRow) { |
| // Output eight pixels per iteration (32 bytes). |
| for (int outX = 0; outX < pixelWidth; outX += 8) { |
| // Accumulated result for each pixel. 32 bits per RGBA channel. |
| __m256i accum01 = _mm256_setzero_si256(); |
| __m256i accum23 = _mm256_setzero_si256(); |
| __m256i accum45 = _mm256_setzero_si256(); |
| __m256i accum67 = _mm256_setzero_si256(); |
| |
| // Convolve with 4 filter coefficient per iteration. |
| int length = filterLength & ~3; |
| for (int filterY = 0; filterY < length; filterY += 4) { |
| compute_coefficient_row(filterValues[filterY + 0], sourceDataRows[filterY + 0] + outX * 4, &accum01, &accum23, &accum45, &accum67); |
| compute_coefficient_row(filterValues[filterY + 1], sourceDataRows[filterY + 1] + outX * 4, &accum01, &accum23, &accum45, &accum67); |
| compute_coefficient_row(filterValues[filterY + 2], sourceDataRows[filterY + 2] + outX * 4, &accum01, &accum23, &accum45, &accum67); |
| compute_coefficient_row(filterValues[filterY + 3], sourceDataRows[filterY + 3] + outX * 4, &accum01, &accum23, &accum45, &accum67); |
| } |
| for (int filterY = length; filterY < filterLength; filterY++) { |
| compute_coefficient_row(filterValues[filterY], sourceDataRows[filterY] + outX * 4, &accum01, &accum23, &accum45, &accum67); |
| } |
| |
| // Shift right for fixed point implementation. |
| accum01 = _mm256_srai_epi32(accum01, SkConvolutionFilter1D::kShiftBits); |
| accum23 = _mm256_srai_epi32(accum23, SkConvolutionFilter1D::kShiftBits); |
| accum45 = _mm256_srai_epi32(accum45, SkConvolutionFilter1D::kShiftBits); |
| accum67 = _mm256_srai_epi32(accum67, SkConvolutionFilter1D::kShiftBits); |
| |
| // Packing 32 bits |accum| to 16 bits per channel (signed saturation). |
| // [16] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 |
| __m256i accum_0123 = _mm256_packs_epi32(accum01, accum23); |
| |
| // Packing 32 bits |accum| to 16 bits per channel (signed saturation). |
| // [16] a7 b7 g7 r7 a6 b6 g6 r6 a5 b5 g5 r5 a4 b4 g4 r4 |
| __m256i accum_4567 = _mm256_packs_epi32(accum45, accum67); |
| |
| // Packing 16 bits |accum| to 8 bits per channel (unsigned saturation). |
| // [8] a7 b7 g7 r7 a6 b6 g6 r6 a5 b5 g5 r5 a4 b4 g4 r4 a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 |
| __m256i accum = _mm256_packus_epi16(accum_0123, accum_4567); |
| |
| if (hasAlpha) { |
| // Make sure the value of alpha channel is always larger than maximum |
| // value of color channels. |
| // If alpha is less than r, g, or b, set it to their max. |
| __m256i max_rg = _mm256_max_epu8( accum, _mm256_srli_epi32(accum, 8)); |
| __m256i max_rgb = _mm256_max_epu8(max_rg, _mm256_srli_epi32(accum, 16)); |
| accum = _mm256_max_epu8(accum, _mm256_slli_epi32(max_rgb, 24)); |
| } else { |
| // Force opaque. |
| accum = _mm256_or_si256(accum, _mm256_set1_epi32(0xff000000)); |
| } |
| |
| // Store the convolution result (32 bytes) and advance the pixel pointers. |
| // During the last iteration, when pixels left are less than 8, store them one at a time. |
| if (outX + 8 <= pixelWidth) { |
| _mm256_storeu_si256(reinterpret_cast<__m256i *>(outRow), accum); |
| outRow += 32; |
| } else { |
| for (int i = outX; i < pixelWidth; i++) { |
| *(reinterpret_cast<int*>(outRow)) = _mm_cvtsi128_si32(_mm256_castsi256_si128(accum)); |
| __m256i rotate = _mm256_setr_epi32(1, 2, 3, 4, 5, 6, 7, 0); |
| accum = _mm256_permutevar8x32_epi32(accum, rotate); |
| outRow += 4; |
| } |
| } |
| } |
| } |
| #endif |
| |
| #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2 |
| |
| static SK_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(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; |
| } |
| } |
| |
| // Convolves horizontally along four rows. The row data is given in |
| // |srcData| and continues for the numValues() of the filter. |
| // The algorithm is almost same as |convolve_horizontally|. Please |
| // refer to that function for detailed comments. |
| void convolve_4_rows_horizontally(const unsigned char* srcData[4], |
| const SkConvolutionFilter1D& filter, |
| unsigned char* outRow[4], |
| size_t outRowBytes) { |
| SkDEBUGCODE(const unsigned char* out_row_0_start = outRow[0];) |
| |
| // Output one pixel each iteration, calculating all channels (RGBA) together. |
| int numValues = filter.numValues(); |
| for (int outX = 0; outX < numValues; outX++) { |
| int filterOffset, filterLength; |
| const SkConvolutionFilter1D::ConvolutionFixed* filterValues = |
| filter.FilterForValue(outX, &filterOffset, &filterLength); |
| |
| __m128i zero = _mm_setzero_si128(); |
| |
| // four pixels in a column per iteration. |
| __m128i accum0 = _mm_setzero_si128(); |
| __m128i accum1 = _mm_setzero_si128(); |
| __m128i accum2 = _mm_setzero_si128(); |
| __m128i accum3 = _mm_setzero_si128(); |
| |
| int start = filterOffset * 4; |
| // We will load and accumulate with four coefficients per iteration. |
| for (int filterX = 0; filterX < (filterLength >> 2); filterX++) { |
| __m128i coeff, coeff16lo, coeff16hi; |
| // [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 |
| coeff16lo = _mm_shufflelo_epi16(coeff, _MM_SHUFFLE(1, 1, 0, 0)); |
| // [16] c1 c1 c1 c1 c0 c0 c0 c0 |
| coeff16lo = _mm_unpacklo_epi16(coeff16lo, coeff16lo); |
| // [16] xx xx xx xx c3 c3 c2 c2 |
| coeff16hi = _mm_shufflelo_epi16(coeff, _MM_SHUFFLE(3, 3, 2, 2)); |
| // [16] c3 c3 c3 c3 c2 c2 c2 c2 |
| coeff16hi = _mm_unpacklo_epi16(coeff16hi, coeff16hi); |
| |
| __m128i src8, src16, mul_hi, mul_lo, t; |
| |
| #define ITERATION(src, accum) \ |
| src8 = _mm_loadu_si128(reinterpret_cast<const __m128i*>(src)); \ |
| src16 = _mm_unpacklo_epi8(src8, zero); \ |
| mul_hi = _mm_mulhi_epi16(src16, coeff16lo); \ |
| mul_lo = _mm_mullo_epi16(src16, coeff16lo); \ |
| t = _mm_unpacklo_epi16(mul_lo, mul_hi); \ |
| accum = _mm_add_epi32(accum, t); \ |
| t = _mm_unpackhi_epi16(mul_lo, mul_hi); \ |
| accum = _mm_add_epi32(accum, t); \ |
| src16 = _mm_unpackhi_epi8(src8, zero); \ |
| mul_hi = _mm_mulhi_epi16(src16, coeff16hi); \ |
| mul_lo = _mm_mullo_epi16(src16, coeff16hi); \ |
| t = _mm_unpacklo_epi16(mul_lo, mul_hi); \ |
| accum = _mm_add_epi32(accum, t); \ |
| t = _mm_unpackhi_epi16(mul_lo, mul_hi); \ |
| accum = _mm_add_epi32(accum, t) |
| |
| ITERATION(srcData[0] + start, accum0); |
| ITERATION(srcData[1] + start, accum1); |
| ITERATION(srcData[2] + start, accum2); |
| ITERATION(srcData[3] + start, accum3); |
| |
| start += 16; |
| filterValues += 4; |
| } |
| |
| int r = filterLength & 3; |
| if (r) { |
| int remainderOffset = (filterOffset + filterLength - r) * 4; |
| AccumRemainder(srcData[0] + remainderOffset, filterValues, accum0, r); |
| AccumRemainder(srcData[1] + remainderOffset, filterValues, accum1, r); |
| AccumRemainder(srcData[2] + remainderOffset, filterValues, accum2, r); |
| AccumRemainder(srcData[3] + remainderOffset, filterValues, accum3, r); |
| } |
| |
| accum0 = _mm_srai_epi32(accum0, SkConvolutionFilter1D::kShiftBits); |
| accum0 = _mm_packs_epi32(accum0, zero); |
| accum0 = _mm_packus_epi16(accum0, zero); |
| accum1 = _mm_srai_epi32(accum1, SkConvolutionFilter1D::kShiftBits); |
| accum1 = _mm_packs_epi32(accum1, zero); |
| accum1 = _mm_packus_epi16(accum1, zero); |
| accum2 = _mm_srai_epi32(accum2, SkConvolutionFilter1D::kShiftBits); |
| accum2 = _mm_packs_epi32(accum2, zero); |
| accum2 = _mm_packus_epi16(accum2, zero); |
| accum3 = _mm_srai_epi32(accum3, SkConvolutionFilter1D::kShiftBits); |
| accum3 = _mm_packs_epi32(accum3, zero); |
| accum3 = _mm_packus_epi16(accum3, zero); |
| |
| // We seem to be running off the edge here (chromium:491660). |
| SkASSERT(((size_t)outRow[0] - (size_t)out_row_0_start) < outRowBytes); |
| |
| *(reinterpret_cast<int*>(outRow[0])) = _mm_cvtsi128_si32(accum0); |
| *(reinterpret_cast<int*>(outRow[1])) = _mm_cvtsi128_si32(accum1); |
| *(reinterpret_cast<int*>(outRow[2])) = _mm_cvtsi128_si32(accum2); |
| *(reinterpret_cast<int*>(outRow[3])) = _mm_cvtsi128_si32(accum3); |
| |
| outRow[0] += 4; |
| outRow[1] += 4; |
| outRow[2] += 4; |
| outRow[3] += 4; |
| } |
| } |
| |
| // If we've got AVX2, we've already defined a faster ConvolveVertically above. |
| #if SK_CPU_SSE_LEVEL < SK_CPU_SSE_LEVEL_AVX2 |
| // 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> |
| 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; |
| } |
| } |
| } |
| #endif//SK_CPU_SSE_LEVEL < SK_CPU_SSE_LEVEL_AVX2 |
| |
| #elif defined(SK_ARM_HAS_NEON) |
| |
| static SK_ALWAYS_INLINE void AccumRemainder(const unsigned char* pixelsLeft, |
| const SkConvolutionFilter1D::ConvolutionFixed* filterValues, int32x4_t& 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]; |
| } |
| int32x4_t t = {remainder[0], remainder[1], remainder[2], remainder[3]}; |
| 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(const unsigned char* srcData, |
| const SkConvolutionFilter1D& filter, |
| unsigned char* outRow, |
| bool /*hasAlpha*/) { |
| // Loop over each pixel on this row in the output image. |
| int numValues = filter.numValues(); |
| for (int outX = 0; outX < numValues; outX++) { |
| uint8x8_t coeff_mask0 = vcreate_u8(0x0100010001000100); |
| uint8x8_t coeff_mask1 = vcreate_u8(0x0302030203020302); |
| uint8x8_t coeff_mask2 = vcreate_u8(0x0504050405040504); |
| uint8x8_t coeff_mask3 = vcreate_u8(0x0706070607060706); |
| // 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]; |
| |
| // Apply the filter to the row to get the destination pixel in |accum|. |
| int32x4_t accum = vdupq_n_s32(0); |
| for (int filterX = 0; filterX < filterLength >> 2; filterX++) { |
| // Load 4 coefficients |
| int16x4_t coeffs, coeff0, coeff1, coeff2, coeff3; |
| coeffs = vld1_s16(filterValues); |
| coeff0 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask0)); |
| coeff1 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask1)); |
| coeff2 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask2)); |
| coeff3 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask3)); |
| |
| // Load pixels and calc |
| uint8x16_t pixels = vld1q_u8(rowToFilter); |
| int16x8_t p01_16 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(pixels))); |
| int16x8_t p23_16 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(pixels))); |
| |
| int16x4_t p0_src = vget_low_s16(p01_16); |
| int16x4_t p1_src = vget_high_s16(p01_16); |
| int16x4_t p2_src = vget_low_s16(p23_16); |
| int16x4_t p3_src = vget_high_s16(p23_16); |
| |
| int32x4_t p0 = vmull_s16(p0_src, coeff0); |
| int32x4_t p1 = vmull_s16(p1_src, coeff1); |
| int32x4_t p2 = vmull_s16(p2_src, coeff2); |
| int32x4_t p3 = vmull_s16(p3_src, coeff3); |
| |
| accum += p0; |
| accum += p1; |
| accum += p2; |
| accum += p3; |
| |
| // Advance the pointers |
| rowToFilter += 16; |
| filterValues += 4; |
| } |
| |
| int r = filterLength & 3; |
| if (r) { |
| int remainder_offset = (filterOffset + filterLength - r) * 4; |
| AccumRemainder(srcData + remainder_offset, filterValues, accum, r); |
| } |
| |
| // Bring this value back in range. All of the filter scaling factors |
| // are in fixed point with kShiftBits bits of fractional part. |
| accum = vshrq_n_s32(accum, SkConvolutionFilter1D::kShiftBits); |
| |
| // Pack and store the new pixel. |
| int16x4_t accum16 = vqmovn_s32(accum); |
| uint8x8_t accum8 = vqmovun_s16(vcombine_s16(accum16, accum16)); |
| vst1_lane_u32(reinterpret_cast<uint32_t*>(outRow), vreinterpret_u32_u8(accum8), 0); |
| outRow += 4; |
| } |
| } |
| |
| // Convolves horizontally along four rows. The row data is given in |
| // |srcData| and continues for the numValues() of the filter. |
| // The algorithm is almost same as |convolve_horizontally|. Please |
| // refer to that function for detailed comments. |
| void convolve_4_rows_horizontally(const unsigned char* srcData[4], |
| const SkConvolutionFilter1D& filter, |
| unsigned char* outRow[4], |
| size_t outRowBytes) { |
| // Output one pixel each iteration, calculating all channels (RGBA) together. |
| int numValues = filter.numValues(); |
| for (int outX = 0; outX < numValues; outX++) { |
| |
| int filterOffset, filterLength; |
| const SkConvolutionFilter1D::ConvolutionFixed* filterValues = |
| filter.FilterForValue(outX, &filterOffset, &filterLength); |
| |
| // four pixels in a column per iteration. |
| int32x4_t accum0 = vdupq_n_s32(0); |
| int32x4_t accum1 = vdupq_n_s32(0); |
| int32x4_t accum2 = vdupq_n_s32(0); |
| int32x4_t accum3 = vdupq_n_s32(0); |
| |
| uint8x8_t coeff_mask0 = vcreate_u8(0x0100010001000100); |
| uint8x8_t coeff_mask1 = vcreate_u8(0x0302030203020302); |
| uint8x8_t coeff_mask2 = vcreate_u8(0x0504050405040504); |
| uint8x8_t coeff_mask3 = vcreate_u8(0x0706070607060706); |
| |
| int start = filterOffset * 4; |
| |
| // We will load and accumulate with four coefficients per iteration. |
| for (int filterX = 0; filterX < (filterLength >> 2); filterX++) { |
| int16x4_t coeffs, coeff0, coeff1, coeff2, coeff3; |
| |
| coeffs = vld1_s16(filterValues); |
| coeff0 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask0)); |
| coeff1 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask1)); |
| coeff2 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask2)); |
| coeff3 = vreinterpret_s16_u8(vtbl1_u8(vreinterpret_u8_s16(coeffs), coeff_mask3)); |
| |
| uint8x16_t pixels; |
| int16x8_t p01_16, p23_16; |
| int32x4_t p0, p1, p2, p3; |
| |
| #define ITERATION(src, accum) \ |
| pixels = vld1q_u8(src); \ |
| p01_16 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(pixels))); \ |
| p23_16 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(pixels))); \ |
| p0 = vmull_s16(vget_low_s16(p01_16), coeff0); \ |
| p1 = vmull_s16(vget_high_s16(p01_16), coeff1); \ |
| p2 = vmull_s16(vget_low_s16(p23_16), coeff2); \ |
| p3 = vmull_s16(vget_high_s16(p23_16), coeff3); \ |
| accum += p0; \ |
| accum += p1; \ |
| accum += p2; \ |
| accum += p3 |
| |
| ITERATION(srcData[0] + start, accum0); |
| ITERATION(srcData[1] + start, accum1); |
| ITERATION(srcData[2] + start, accum2); |
| ITERATION(srcData[3] + start, accum3); |
| |
| start += 16; |
| filterValues += 4; |
| } |
| |
| int r = filterLength & 3; |
| if (r) { |
| int remainder_offset = (filterOffset + filterLength - r) * 4; |
| AccumRemainder(srcData[0] + remainder_offset, filterValues, accum0, r); |
| AccumRemainder(srcData[1] + remainder_offset, filterValues, accum1, r); |
| AccumRemainder(srcData[2] + remainder_offset, filterValues, accum2, r); |
| AccumRemainder(srcData[3] + remainder_offset, filterValues, accum3, r); |
| } |
| |
| int16x4_t accum16; |
| uint8x8_t res0, res1, res2, res3; |
| |
| #define PACK_RESULT(accum, res) \ |
| accum = vshrq_n_s32(accum, SkConvolutionFilter1D::kShiftBits); \ |
| accum16 = vqmovn_s32(accum); \ |
| res = vqmovun_s16(vcombine_s16(accum16, accum16)); |
| |
| PACK_RESULT(accum0, res0); |
| PACK_RESULT(accum1, res1); |
| PACK_RESULT(accum2, res2); |
| PACK_RESULT(accum3, res3); |
| |
| vst1_lane_u32(reinterpret_cast<uint32_t*>(outRow[0]), vreinterpret_u32_u8(res0), 0); |
| vst1_lane_u32(reinterpret_cast<uint32_t*>(outRow[1]), vreinterpret_u32_u8(res1), 0); |
| vst1_lane_u32(reinterpret_cast<uint32_t*>(outRow[2]), vreinterpret_u32_u8(res2), 0); |
| vst1_lane_u32(reinterpret_cast<uint32_t*>(outRow[3]), vreinterpret_u32_u8(res3), 0); |
| outRow[0] += 4; |
| outRow[1] += 4; |
| outRow[2] += 4; |
| outRow[3] += 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> |
| void ConvolveVertically(const SkConvolutionFilter1D::ConvolutionFixed* filterValues, |
| int filterLength, |
| unsigned char* const* sourceDataRows, |
| int pixelWidth, |
| unsigned char* outRow) { |
| int width = pixelWidth & ~3; |
| |
| // Output four pixels per iteration (16 bytes). |
| for (int outX = 0; outX < width; outX += 4) { |
| |
| // Accumulated result for each pixel. 32 bits per RGBA channel. |
| int32x4_t accum0 = vdupq_n_s32(0); |
| int32x4_t accum1 = vdupq_n_s32(0); |
| int32x4_t accum2 = vdupq_n_s32(0); |
| int32x4_t accum3 = vdupq_n_s32(0); |
| |
| // Convolve with one filter coefficient per iteration. |
| for (int filterY = 0; filterY < filterLength; filterY++) { |
| |
| // Duplicate the filter coefficient 4 times. |
| // [16] cj cj cj cj |
| int16x4_t coeff16 = vdup_n_s16(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 |
| uint8x16_t src8 = vld1q_u8(&sourceDataRows[filterY][outX << 2]); |
| |
| int16x8_t src16_01 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(src8))); |
| int16x8_t src16_23 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(src8))); |
| int16x4_t src16_0 = vget_low_s16(src16_01); |
| int16x4_t src16_1 = vget_high_s16(src16_01); |
| int16x4_t src16_2 = vget_low_s16(src16_23); |
| int16x4_t src16_3 = vget_high_s16(src16_23); |
| |
| accum0 += vmull_s16(src16_0, coeff16); |
| accum1 += vmull_s16(src16_1, coeff16); |
| accum2 += vmull_s16(src16_2, coeff16); |
| accum3 += vmull_s16(src16_3, coeff16); |
| } |
| |
| // Shift right for fixed point implementation. |
| accum0 = vshrq_n_s32(accum0, SkConvolutionFilter1D::kShiftBits); |
| accum1 = vshrq_n_s32(accum1, SkConvolutionFilter1D::kShiftBits); |
| accum2 = vshrq_n_s32(accum2, SkConvolutionFilter1D::kShiftBits); |
| accum3 = vshrq_n_s32(accum3, SkConvolutionFilter1D::kShiftBits); |
| |
| // Packing 32 bits |accum| to 16 bits per channel (signed saturation). |
| // [16] a1 b1 g1 r1 a0 b0 g0 r0 |
| int16x8_t accum16_0 = vcombine_s16(vqmovn_s32(accum0), vqmovn_s32(accum1)); |
| // [16] a3 b3 g3 r3 a2 b2 g2 r2 |
| int16x8_t accum16_1 = vcombine_s16(vqmovn_s32(accum2), vqmovn_s32(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 |
| uint8x16_t accum8 = vcombine_u8(vqmovun_s16(accum16_0), vqmovun_s16(accum16_1)); |
| |
| 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 |
| uint8x16_t a = vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 8)); |
| // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 |
| uint8x16_t b = vmaxq_u8(a, accum8); // Max of r and g |
| // [8] xx xx a3 b3 xx xx a2 b2 xx xx a1 b1 xx xx a0 b0 |
| a = vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 16)); |
| // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 |
| b = vmaxq_u8(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 = vreinterpretq_u8_u32(vshlq_n_u32(vreinterpretq_u32_u8(b), 24)); |
| |
| // Make sure the value of alpha channel is always larger than maximum |
| // value of color channels. |
| accum8 = vmaxq_u8(b, accum8); |
| } else { |
| // Set value of alpha channels to 0xFF. |
| accum8 = vreinterpretq_u8_u32(vreinterpretq_u32_u8(accum8) | vdupq_n_u32(0xFF000000)); |
| } |
| |
| // Store the convolution result (16 bytes) and advance the pixel pointers. |
| vst1q_u8(outRow, accum8); |
| outRow += 16; |
| } |
| |
| // Process the leftovers when the width of the output is not divisible |
| // by 4, that is at most 3 pixels. |
| int r = pixelWidth & 3; |
| if (r) { |
| |
| int32x4_t accum0 = vdupq_n_s32(0); |
| int32x4_t accum1 = vdupq_n_s32(0); |
| int32x4_t accum2 = vdupq_n_s32(0); |
| |
| for (int filterY = 0; filterY < filterLength; ++filterY) { |
| int16x4_t coeff16 = vdup_n_s16(filterValues[filterY]); |
| |
| // [8] a3 b3 g3 r3 a2 b2 g2 r2 a1 b1 g1 r1 a0 b0 g0 r0 |
| uint8x16_t src8 = vld1q_u8(&sourceDataRows[filterY][width << 2]); |
| |
| int16x8_t src16_01 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(src8))); |
| int16x8_t src16_23 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(src8))); |
| int16x4_t src16_0 = vget_low_s16(src16_01); |
| int16x4_t src16_1 = vget_high_s16(src16_01); |
| int16x4_t src16_2 = vget_low_s16(src16_23); |
| |
| accum0 += vmull_s16(src16_0, coeff16); |
| accum1 += vmull_s16(src16_1, coeff16); |
| accum2 += vmull_s16(src16_2, coeff16); |
| } |
| |
| accum0 = vshrq_n_s32(accum0, SkConvolutionFilter1D::kShiftBits); |
| accum1 = vshrq_n_s32(accum1, SkConvolutionFilter1D::kShiftBits); |
| accum2 = vshrq_n_s32(accum2, SkConvolutionFilter1D::kShiftBits); |
| |
| int16x8_t accum16_0 = vcombine_s16(vqmovn_s32(accum0), vqmovn_s32(accum1)); |
| int16x8_t accum16_1 = vcombine_s16(vqmovn_s32(accum2), vqmovn_s32(accum2)); |
| |
| uint8x16_t accum8 = vcombine_u8(vqmovun_s16(accum16_0), vqmovun_s16(accum16_1)); |
| |
| 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 |
| uint8x16_t a = vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 8)); |
| // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 |
| uint8x16_t b = vmaxq_u8(a, accum8); // Max of r and g |
| // [8] xx xx a3 b3 xx xx a2 b2 xx xx a1 b1 xx xx a0 b0 |
| a = vreinterpretq_u8_u32(vshrq_n_u32(vreinterpretq_u32_u8(accum8), 16)); |
| // [8] xx xx xx max3 xx xx xx max2 xx xx xx max1 xx xx xx max0 |
| b = vmaxq_u8(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 = vreinterpretq_u8_u32(vshlq_n_u32(vreinterpretq_u32_u8(b), 24)); |
| |
| // Make sure the value of alpha channel is always larger than maximum |
| // value of color channels. |
| accum8 = vmaxq_u8(b, accum8); |
| } else { |
| // Set value of alpha channels to 0xFF. |
| accum8 = vreinterpretq_u8_u32(vreinterpretq_u32_u8(accum8) | vdupq_n_u32(0xFF000000)); |
| } |
| |
| switch(r) { |
| case 1: |
| vst1q_lane_u32(reinterpret_cast<uint32_t*>(outRow), vreinterpretq_u32_u8(accum8), 0); |
| break; |
| case 2: |
| vst1_u32(reinterpret_cast<uint32_t*>(outRow), |
| vreinterpret_u32_u8(vget_low_u8(accum8))); |
| break; |
| case 3: |
| vst1_u32(reinterpret_cast<uint32_t*>(outRow), |
| vreinterpret_u32_u8(vget_low_u8(accum8))); |
| vst1q_lane_u32(reinterpret_cast<uint32_t*>(outRow+8), vreinterpretq_u32_u8(accum8), 2); |
| break; |
| } |
| } |
| } |
| |
| #else |
| |
| // Converts the argument to an 8-bit unsigned value by clamping to the range |
| // 0-255. |
| inline unsigned char ClampTo8(int a) { |
| if (static_cast<unsigned>(a) < 256) { |
| return a; // Avoid the extra check in the common case. |
| } |
| if (a < 0) { |
| return 0; |
| } |
| return 255; |
| } |
| |
| // Convolves horizontally along a single row. The row data is given in |
| // |srcData| and continues for the numValues() of the filter. |
| template<bool hasAlpha> |
| void ConvolveHorizontally(const unsigned char* srcData, |
| const SkConvolutionFilter1D& filter, |
| unsigned char* outRow) { |
| // Loop over each pixel on this row in the output image. |
| 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]; |
| |
| // Apply the filter to the row to get the destination pixel in |accum|. |
| int accum[4] = {0}; |
| for (int filterX = 0; filterX < filterLength; filterX++) { |
| SkConvolutionFilter1D::ConvolutionFixed curFilter = filterValues[filterX]; |
| accum[0] += curFilter * rowToFilter[filterX * 4 + 0]; |
| accum[1] += curFilter * rowToFilter[filterX * 4 + 1]; |
| accum[2] += curFilter * rowToFilter[filterX * 4 + 2]; |
| if (hasAlpha) { |
| accum[3] += curFilter * rowToFilter[filterX * 4 + 3]; |
| } |
| } |
| |
| // Bring this value back in range. All of the filter scaling factors |
| // are in fixed point with kShiftBits bits of fractional part. |
| accum[0] >>= SkConvolutionFilter1D::kShiftBits; |
| accum[1] >>= SkConvolutionFilter1D::kShiftBits; |
| accum[2] >>= SkConvolutionFilter1D::kShiftBits; |
| if (hasAlpha) { |
| accum[3] >>= SkConvolutionFilter1D::kShiftBits; |
| } |
| |
| // Store the new pixel. |
| outRow[outX * 4 + 0] = ClampTo8(accum[0]); |
| outRow[outX * 4 + 1] = ClampTo8(accum[1]); |
| outRow[outX * 4 + 2] = ClampTo8(accum[2]); |
| if (hasAlpha) { |
| outRow[outX * 4 + 3] = ClampTo8(accum[3]); |
| } |
| } |
| } |
| |
| // 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> |
| void ConvolveVertically(const SkConvolutionFilter1D::ConvolutionFixed* filterValues, |
| int filterLength, |
| unsigned char* const* sourceDataRows, |
| int pixelWidth, |
| unsigned char* outRow) { |
| // We go through each column in the output and do a vertical convolution, |
| // generating one output pixel each time. |
| for (int outX = 0; outX < pixelWidth; outX++) { |
| // Compute the number of bytes over in each row that the current column |
| // we're convolving starts at. The pixel will cover the next 4 bytes. |
| int byteOffset = outX * 4; |
| |
| // Apply the filter to one column of pixels. |
| int accum[4] = {0}; |
| for (int filterY = 0; filterY < filterLength; filterY++) { |
| SkConvolutionFilter1D::ConvolutionFixed curFilter = filterValues[filterY]; |
| accum[0] += curFilter * sourceDataRows[filterY][byteOffset + 0]; |
| accum[1] += curFilter * sourceDataRows[filterY][byteOffset + 1]; |
| accum[2] += curFilter * sourceDataRows[filterY][byteOffset + 2]; |
| if (hasAlpha) { |
| accum[3] += curFilter * sourceDataRows[filterY][byteOffset + 3]; |
| } |
| } |
| |
| // Bring this value back in range. All of the filter scaling factors |
| // are in fixed point with kShiftBits bits of precision. |
| accum[0] >>= SkConvolutionFilter1D::kShiftBits; |
| accum[1] >>= SkConvolutionFilter1D::kShiftBits; |
| accum[2] >>= SkConvolutionFilter1D::kShiftBits; |
| if (hasAlpha) { |
| accum[3] >>= SkConvolutionFilter1D::kShiftBits; |
| } |
| |
| // Store the new pixel. |
| outRow[byteOffset + 0] = ClampTo8(accum[0]); |
| outRow[byteOffset + 1] = ClampTo8(accum[1]); |
| outRow[byteOffset + 2] = ClampTo8(accum[2]); |
| if (hasAlpha) { |
| unsigned char alpha = ClampTo8(accum[3]); |
| |
| // Make sure the alpha channel doesn't come out smaller than any of the |
| // color channels. We use premultipled alpha channels, so this should |
| // never happen, but rounding errors will cause this from time to time. |
| // These "impossible" colors will cause overflows (and hence random pixel |
| // values) when the resulting bitmap is drawn to the screen. |
| // |
| // We only need to do this when generating the final output row (here). |
| int maxColorChannel = SkTMax(outRow[byteOffset + 0], |
| SkTMax(outRow[byteOffset + 1], |
| outRow[byteOffset + 2])); |
| if (alpha < maxColorChannel) { |
| outRow[byteOffset + 3] = maxColorChannel; |
| } else { |
| outRow[byteOffset + 3] = alpha; |
| } |
| } else { |
| // No alpha channel, the image is opaque. |
| outRow[byteOffset + 3] = 0xff; |
| } |
| } |
| } |
| |
| // There's a bug somewhere here with GCC autovectorization (-ftree-vectorize). We originally |
| // thought this was 32 bit only, but subsequent tests show that some 64 bit gcc compiles |
| // suffer here too. |
| // |
| // Dropping to -O2 disables -ftree-vectorize. GCC 4.6 needs noinline. https://bug.skia.org/2575 |
| #if SK_HAS_ATTRIBUTE(optimize) && defined(SK_RELEASE) |
| #define SK_MAYBE_DISABLE_VECTORIZATION __attribute__((optimize("O2"), noinline)) |
| #else |
| #define SK_MAYBE_DISABLE_VECTORIZATION |
| #endif |
| |
| SK_MAYBE_DISABLE_VECTORIZATION |
| void convolve_horizontally(const unsigned char* srcData, |
| const SkConvolutionFilter1D& filter, |
| unsigned char* outRow, |
| bool hasAlpha) { |
| if (hasAlpha) { |
| ConvolveHorizontally<true>(srcData, filter, outRow); |
| } else { |
| ConvolveHorizontally<false>(srcData, filter, outRow); |
| } |
| } |
| #undef SK_MAYBE_DISABLE_VECTORIZATION |
| |
| void (*convolve_4_rows_horizontally)(const unsigned char* srcData[4], |
| const SkConvolutionFilter1D& filter, |
| unsigned char* outRow[4], |
| size_t outRowBytes) |
| = nullptr; |
| |
| |
| #endif |
| |
| void convolve_vertically(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 SK_OPTS_NS |
| |
| #endif//SkBitmapFilter_opts_DEFINED |
