Index: src/opts/SkBitmapFilter_opts.h |
diff --git a/src/opts/SkBitmapFilter_opts.h b/src/opts/SkBitmapFilter_opts.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f22b5c2368050681f6979fe08dfaeeec8405c6ca |
--- /dev/null |
+++ b/src/opts/SkBitmapFilter_opts.h |
@@ -0,0 +1,940 @@ |
+/* |
+ * 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 <emmintrin.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_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; |
+ } |
+ } |
+ |
+ // 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; |
+ } |
+ } |
+ } |
+ |
+#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 |