The Tor Browser: comparison gfx/skia/trunk/src/opts/SkBitmapProcState_opts

--1:000000000000
+:3d1214c9e0f2
+/*
+* Copyright 2012 The Android Open Source Project
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+#include "SkBitmapProcState_opts_SSSE3.h"
+#include "SkPaint.h"
+#include "SkUtils.h"
+/* With the exception of the Android framework we always build the SSSE3 functions
+* and enable the caller to determine SSSE3 support.  However for the Android framework
+* if the device does not support SSSE3 then the compiler will not supply the required
+* -mssse3 option needed to build this file, so instead we provide a stub implementation.
+*/
+#if !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) || SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
+#include <tmmintrin.h>  // SSSE3
+// adding anonymous namespace seemed to force gcc to inline directly the
+// instantiation, instead of creating the functions
+// S32_generic_D32_filter_DX_SSSE3<true> and
+// S32_generic_D32_filter_DX_SSSE3<false> which were then called by the
+// external functions.
+namespace {
+// In this file, variations for alpha and non alpha versions are implemented
+// with a template, as it makes the code more compact and a bit easier to
+// maintain, while making the compiler generate the same exact code as with
+// two functions that only differ by a few lines.
+// Prepare all necessary constants for a round of processing for two pixel
+// pairs.
+// @param xy is the location where the xy parameters for four pixels should be
+//           read from. It is identical in concept with argument two of
+//           S32_{opaque}_D32_filter_DX methods.
+// @param mask_3FFF vector of 32 bit constants containing 3FFF,
+//                  suitable to mask the bottom 14 bits of a XY value.
+// @param mask_000F vector of 32 bit constants containing 000F,
+//                  suitable to mask the bottom 4 bits of a XY value.
+// @param sixteen_8bit vector of 8 bit components containing the value 16.
+// @param mask_dist_select vector of 8 bit components containing the shuffling
+//                         parameters to reorder x[0-3] parameters.
+// @param all_x_result vector of 8 bit components that will contain the
+//              (4x(x3), 4x(x2), 4x(x1), 4x(x0)) upon return.
+// @param sixteen_minus_x vector of 8 bit components, containing
+//              (4x(16 - x3), 4x(16 - x2), 4x(16 - x1), 4x(16 - x0))
+inline void PrepareConstantsTwoPixelPairs(const uint32_t* xy,
+const __m128i& mask_3FFF,
+const __m128i& mask_000F,
+const __m128i& sixteen_8bit,
+const __m128i& mask_dist_select,
+__m128i* all_x_result,
+__m128i* sixteen_minus_x,
+int* x0,
+int* x1) {
+const __m128i xx = _mm_loadu_si128(reinterpret_cast<const __m128i *>(xy));
+// 4 delta X
+// (x03, x02, x01, x00)
+const __m128i x0_wide = _mm_srli_epi32(xx, 18);
+// (x13, x12, x11, x10)
+const __m128i x1_wide = _mm_and_si128(xx, mask_3FFF);
+_mm_storeu_si128(reinterpret_cast<__m128i *>(x0), x0_wide);
+_mm_storeu_si128(reinterpret_cast<__m128i *>(x1), x1_wide);
+__m128i all_x = _mm_and_si128(_mm_srli_epi32(xx, 14), mask_000F);
+// (4x(x3), 4x(x2), 4x(x1), 4x(x0))
+all_x = _mm_shuffle_epi8(all_x, mask_dist_select);
+*all_x_result = all_x;
+// (4x(16-x3), 4x(16-x2), 4x(16-x1), 4x(16-x0))
+*sixteen_minus_x = _mm_sub_epi8(sixteen_8bit, all_x);
+}
+// Prepare all necessary constants for a round of processing for two pixel
+// pairs.
+// @param xy is the location where the xy parameters for four pixels should be
+//           read from. It is identical in concept with argument two of
+//           S32_{opaque}_D32_filter_DXDY methods.
+// @param mask_3FFF vector of 32 bit constants containing 3FFF,
+//                  suitable to mask the bottom 14 bits of a XY value.
+// @param mask_000F vector of 32 bit constants containing 000F,
+//                  suitable to mask the bottom 4 bits of a XY value.
+// @param sixteen_8bit vector of 8 bit components containing the value 16.
+// @param mask_dist_select vector of 8 bit components containing the shuffling
+//                         parameters to reorder x[0-3] parameters.
+// @param all_xy_result vector of 8 bit components that will contain the
+//              (4x(y1), 4x(y0), 4x(x1), 4x(x0)) upon return.
+// @param sixteen_minus_x vector of 8 bit components, containing
+//              (4x(16-y1), 4x(16-y0), 4x(16-x1), 4x(16-x0)).
+inline void PrepareConstantsTwoPixelPairsDXDY(const uint32_t* xy,
+const __m128i& mask_3FFF,
+const __m128i& mask_000F,
+const __m128i& sixteen_8bit,
+const __m128i& mask_dist_select,
+__m128i* all_xy_result,
+__m128i* sixteen_minus_xy,
+int* xy0, int* xy1) {
+const __m128i xy_wide =
+_mm_loadu_si128(reinterpret_cast<const __m128i *>(xy));
+// (x10, y10, x00, y00)
+__m128i xy0_wide = _mm_srli_epi32(xy_wide, 18);
+// (y10, y00, x10, x00)
+xy0_wide =  _mm_shuffle_epi32(xy0_wide, _MM_SHUFFLE(2, 0, 3, 1));
+// (x11, y11, x01, y01)
+__m128i xy1_wide = _mm_and_si128(xy_wide, mask_3FFF);
+// (y11, y01, x11, x01)
+xy1_wide = _mm_shuffle_epi32(xy1_wide, _MM_SHUFFLE(2, 0, 3, 1));
+_mm_storeu_si128(reinterpret_cast<__m128i *>(xy0), xy0_wide);
+_mm_storeu_si128(reinterpret_cast<__m128i *>(xy1), xy1_wide);
+// (x1, y1, x0, y0)
+__m128i all_xy = _mm_and_si128(_mm_srli_epi32(xy_wide, 14), mask_000F);
+// (y1, y0, x1, x0)
+all_xy = _mm_shuffle_epi32(all_xy, _MM_SHUFFLE(2, 0, 3, 1));
+// (4x(y1), 4x(y0), 4x(x1), 4x(x0))
+all_xy = _mm_shuffle_epi8(all_xy, mask_dist_select);
+*all_xy_result = all_xy;
+// (4x(16-y1), 4x(16-y0), 4x(16-x1), 4x(16-x0))
+*sixteen_minus_xy = _mm_sub_epi8(sixteen_8bit, all_xy);
+}
+// Helper function used when processing one pixel pair.
+// @param pixel0..3 are the four input pixels
+// @param scale_x vector of 8 bit components to multiply the pixel[0:3]. This
+//                will contain (4x(x1, 16-x1), 4x(x0, 16-x0))
+//                or (4x(x3, 16-x3), 4x(x2, 16-x2))
+// @return a vector of 16 bit components containing:
+// (Aa2 * (16 - x1) + Aa3 * x1, ... , Ra0 * (16 - x0) + Ra1 * x0)
+inline __m128i ProcessPixelPairHelper(uint32_t pixel0,
+uint32_t pixel1,
+uint32_t pixel2,
+uint32_t pixel3,
+const __m128i& scale_x) {
+__m128i a0, a1, a2, a3;
+// Load 2 pairs of pixels
+a0 = _mm_cvtsi32_si128(pixel0);
+a1 = _mm_cvtsi32_si128(pixel1);
+// Interleave pixels.
+// (0, 0, 0, 0, 0, 0, 0, 0, Aa1, Aa0, Ba1, Ba0, Ga1, Ga0, Ra1, Ra0)
+a0 = _mm_unpacklo_epi8(a0, a1);
+a2 = _mm_cvtsi32_si128(pixel2);
+a3 = _mm_cvtsi32_si128(pixel3);
+// (0, 0, 0, 0, 0, 0, 0, 0, Aa3, Aa2, Ba3, Ba2, Ga3, Ga2, Ra3, Ra2)
+a2 = _mm_unpacklo_epi8(a2, a3);
+// two pairs of pixel pairs, interleaved.
+// (Aa3, Aa2, Ba3, Ba2, Ga3, Ga2, Ra3, Ra2,
+//  Aa1, Aa0, Ba1, Ba0, Ga1, Ga0, Ra1, Ra0)
+a0 = _mm_unpacklo_epi64(a0, a2);
+// multiply and sum to 16 bit components.
+// (Aa2 * (16 - x1) + Aa3 * x1, ... , Ra0 * (16 - x0) + Ra1 * x0)
+// At that point, we use up a bit less than 12 bits for each 16 bit
+// component:
+// All components are less than 255. So,
+// C0 * (16 - x) + C1 * x <= 255 * (16 - x) + 255 * x = 255 * 16.
+return _mm_maddubs_epi16(a0, scale_x);
+}
+// Scale back the results after multiplications to the [0:255] range, and scale
+// by alpha when has_alpha is true.
+// Depending on whether one set or two sets of multiplications had been applied,
+// the results have to be shifted by four places (dividing by 16), or shifted
+// by eight places (dividing by 256), since each multiplication is by a quantity
+// in the range [0:16].
+template<bool has_alpha, int scale>
+inline __m128i ScaleFourPixels(__m128i* pixels,
+const __m128i& alpha) {
+// Divide each 16 bit component by 16 (or 256 depending on scale).
+*pixels = _mm_srli_epi16(*pixels, scale);
+if (has_alpha) {
+// Multiply by alpha.
+*pixels = _mm_mullo_epi16(*pixels, alpha);
+// Divide each 16 bit component by 256.
+*pixels = _mm_srli_epi16(*pixels, 8);
+}
+return *pixels;
+}
+// Wrapper to calculate two output pixels from four input pixels. The
+// arguments are the same as ProcessPixelPairHelper. Technically, there are
+// eight input pixels, but since sub_y == 0, the factors applied to half of the
+// pixels is zero (sub_y), and are therefore omitted here to save on some
+// processing.
+// @param alpha when has_alpha is true, scale all resulting components by this
+//              value.
+// @return a vector of 16 bit components containing:
+// ((Aa2 * (16 - x1) + Aa3 * x1) * alpha, ...,
+// (Ra0 * (16 - x0) + Ra1 * x0) * alpha) (when has_alpha is true)
+// otherwise
+// (Aa2 * (16 - x1) + Aa3 * x1, ... , Ra0 * (16 - x0) + Ra1 * x0)
+// In both cases, the results are renormalized (divided by 16) to match the
+// expected formats when storing back the results into memory.
+template<bool has_alpha>
+inline __m128i ProcessPixelPairZeroSubY(uint32_t pixel0,
+uint32_t pixel1,
+uint32_t pixel2,
+uint32_t pixel3,
+const __m128i& scale_x,
+const __m128i& alpha) {
+__m128i sum = ProcessPixelPairHelper(pixel0, pixel1, pixel2, pixel3,
+scale_x);
+return ScaleFourPixels<has_alpha, 4>(&sum, alpha);
+}
+// Same as ProcessPixelPairZeroSubY, expect processing one output pixel at a
+// time instead of two. As in the above function, only two pixels are needed
+// to generate a single pixel since sub_y == 0.
+// @return same as ProcessPixelPairZeroSubY, except that only the bottom 4
+// 16 bit components are set.
+template<bool has_alpha>
+inline __m128i ProcessOnePixelZeroSubY(uint32_t pixel0,
+uint32_t pixel1,
+__m128i scale_x,
+__m128i alpha) {
+__m128i a0 = _mm_cvtsi32_si128(pixel0);
+__m128i a1 = _mm_cvtsi32_si128(pixel1);
+// Interleave
+a0 = _mm_unpacklo_epi8(a0, a1);
+// (a0 * (16-x) + a1 * x)
+__m128i sum = _mm_maddubs_epi16(a0, scale_x);
+return ScaleFourPixels<has_alpha, 4>(&sum, alpha);
+}
+// Methods when sub_y != 0
+// Same as ProcessPixelPairHelper, except that the values are scaled by y.
+// @param y vector of 16 bit components containing 'y' values. There are two
+//        cases in practice, where y will contain the sub_y constant, or will
+//        contain the 16 - sub_y constant.
+// @return vector of 16 bit components containing:
+// (y * (Aa2 * (16 - x1) + Aa3 * x1), ... , y * (Ra0 * (16 - x0) + Ra1 * x0))
+inline __m128i ProcessPixelPair(uint32_t pixel0,
+uint32_t pixel1,
+uint32_t pixel2,
+uint32_t pixel3,
+const __m128i& scale_x,
+const __m128i& y) {
+__m128i sum = ProcessPixelPairHelper(pixel0, pixel1, pixel2, pixel3,
+scale_x);
+// first row times 16-y or y depending on whether 'y' represents one or
+// the other.
+// Values will be up to 255 * 16 * 16 = 65280.
+// (y * (Aa2 * (16 - x1) + Aa3 * x1), ... ,
+//  y * (Ra0 * (16 - x0) + Ra1 * x0))
+sum = _mm_mullo_epi16(sum, y);
+return sum;
+}
+// Process two pixel pairs out of eight input pixels.
+// In other methods, the distinct pixels are passed one by one, but in this
+// case, the rows, and index offsets to the pixels into the row are passed
+// to generate the 8 pixels.
+// @param row0..1 top and bottom row where to find input pixels.
+// @param x0..1 offsets into the row for all eight input pixels.
+// @param all_y vector of 16 bit components containing the constant sub_y
+// @param neg_y vector of 16 bit components containing the constant 16 - sub_y
+// @param alpha vector of 16 bit components containing the alpha value to scale
+//        the results by, when has_alpha is true.
+// @return
+// (alpha * ((16-y) * (Aa2  * (16-x1) + Aa3  * x1) +
+//             y    * (Aa2' * (16-x1) + Aa3' * x1)),
+// ...
+//  alpha * ((16-y) * (Ra0  * (16-x0) + Ra1 * x0) +
+//             y    * (Ra0' * (16-x0) + Ra1' * x0))
+// With the factor alpha removed when has_alpha is false.
+// The values are scaled back to 16 bit components, but with only the bottom
+// 8 bits being set.
+template<bool has_alpha>
+inline __m128i ProcessTwoPixelPairs(const uint32_t* row0,
+const uint32_t* row1,
+const int* x0,
+const int* x1,
+const __m128i& scale_x,
+const __m128i& all_y,
+const __m128i& neg_y,
+const __m128i& alpha) {
+__m128i sum0 = ProcessPixelPair(
+row0[x0[0]], row0[x1[0]], row0[x0[1]], row0[x1[1]],
+scale_x, neg_y);
+__m128i sum1 = ProcessPixelPair(
+row1[x0[0]], row1[x1[0]], row1[x0[1]], row1[x1[1]],
+scale_x, all_y);
+// 2 samples fully summed.
+// ((16-y) * (Aa2 * (16-x1) + Aa3 * x1) +
+//  y * (Aa2' * (16-x1) + Aa3' * x1),
+// ...
+//  (16-y) * (Ra0 * (16 - x0) + Ra1 * x0)) +
+//  y * (Ra0' * (16-x0) + Ra1' * x0))
+// Each component, again can be at most 256 * 255 = 65280, so no overflow.
+sum0 = _mm_add_epi16(sum0, sum1);
+return ScaleFourPixels<has_alpha, 8>(&sum0, alpha);
+}
+// Similar to ProcessTwoPixelPairs except the pixel indexes.
+template<bool has_alpha>
+inline __m128i ProcessTwoPixelPairsDXDY(const uint32_t* row00,
+const uint32_t* row01,
+const uint32_t* row10,
+const uint32_t* row11,
+const int* xy0,
+const int* xy1,
+const __m128i& scale_x,
+const __m128i& all_y,
+const __m128i& neg_y,
+const __m128i& alpha) {
+// first row
+__m128i sum0 = ProcessPixelPair(
+row00[xy0[0]], row00[xy1[0]], row10[xy0[1]], row10[xy1[1]],
+scale_x, neg_y);
+// second row
+__m128i sum1 = ProcessPixelPair(
+row01[xy0[0]], row01[xy1[0]], row11[xy0[1]], row11[xy1[1]],
+scale_x, all_y);
+// 2 samples fully summed.
+// ((16-y1) * (Aa2 * (16-x1) + Aa3 * x1) +
+//  y0 * (Aa2' * (16-x1) + Aa3' * x1),
+// ...
+//  (16-y0) * (Ra0 * (16 - x0) + Ra1 * x0)) +
+//  y0 * (Ra0' * (16-x0) + Ra1' * x0))
+// Each component, again can be at most 256 * 255 = 65280, so no overflow.
+sum0 = _mm_add_epi16(sum0, sum1);
+return ScaleFourPixels<has_alpha, 8>(&sum0, alpha);
+}
+// Same as ProcessPixelPair, except that performing the math one output pixel
+// at a time. This means that only the bottom four 16 bit components are set.
+inline __m128i ProcessOnePixel(uint32_t pixel0, uint32_t pixel1,
+const __m128i& scale_x, const __m128i& y) {
+__m128i a0 = _mm_cvtsi32_si128(pixel0);
+__m128i a1 = _mm_cvtsi32_si128(pixel1);
+// Interleave
+// (0, 0, 0, 0, 0, 0, 0, 0, Aa1, Aa0, Ba1, Ba0, Ga1, Ga0, Ra1, Ra0)
+a0 = _mm_unpacklo_epi8(a0, a1);
+// (a0 * (16-x) + a1 * x)
+a0 = _mm_maddubs_epi16(a0, scale_x);
+// scale row by y
+return _mm_mullo_epi16(a0, y);
+}
+// Notes about the various tricks that are used in this implementation:
+// - specialization for sub_y == 0.
+// Statistically, 1/16th of the samples will have sub_y == 0. When this
+// happens, the math goes from:
+// (16 - x)*(16 - y)*a00 + x*(16 - y)*a01 + (16 - x)*y*a10 + x*y*a11
+// to:
+// (16 - x)*a00 + 16*x*a01
+// much simpler. The simplification makes for an easy boost in performance.
+// - calculating 4 output pixels at a time.
+//  This allows loading the coefficients x0 and x1 and shuffling them to the
+// optimum location only once per loop, instead of twice per loop.
+// This also allows us to store the four pixels with a single store.
+// - Use of 2 special SSSE3 instructions (comparatively to the SSE2 instruction
+// version):
+// _mm_shuffle_epi8 : this allows us to spread the coefficients x[0-3] loaded
+// in 32 bit values to 8 bit values repeated four times.
+// _mm_maddubs_epi16 : this allows us to perform multiplications and additions
+// in one swoop of 8bit values storing the results in 16 bit values. This
+// instruction is actually crucial for the speed of the implementation since
+// as one can see in the SSE2 implementation, all inputs have to be used as
+// 16 bits because the results are 16 bits. This basically allows us to process
+// twice as many pixel components per iteration.
+//
+// As a result, this method behaves faster than the traditional SSE2. The actual
+// boost varies greatly on the underlying architecture.
+template<bool has_alpha>
+void S32_generic_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+SkASSERT(count > 0 && colors != NULL);
+SkASSERT(s.fFilterLevel != SkPaint::kNone_FilterLevel);
+SkASSERT(s.fBitmap->config() == SkBitmap::kARGB_8888_Config);
+if (has_alpha) {
+SkASSERT(s.fAlphaScale < 256);
+} else {
+SkASSERT(s.fAlphaScale == 256);
+}
+const uint8_t* src_addr =
+static_cast<const uint8_t*>(s.fBitmap->getPixels());
+const size_t rb = s.fBitmap->rowBytes();
+const uint32_t XY = *xy++;
+const unsigned y0 = XY >> 14;
+const uint32_t* row0 =
+reinterpret_cast<const uint32_t*>(src_addr + (y0 >> 4) * rb);
+const uint32_t* row1 =
+reinterpret_cast<const uint32_t*>(src_addr + (XY & 0x3FFF) * rb);
+const unsigned sub_y = y0 & 0xF;
+// vector constants
+const __m128i mask_dist_select = _mm_set_epi8(12, 12, 12, 12,
+8,  8,  8,  8,
+4,  4,  4,  4,
+0,  0,  0,  0);
+const __m128i mask_3FFF = _mm_set1_epi32(0x3FFF);
+const __m128i mask_000F = _mm_set1_epi32(0x000F);
+const __m128i sixteen_8bit = _mm_set1_epi8(16);
+// (0, 0, 0, 0, 0, 0, 0, 0)
+const __m128i zero = _mm_setzero_si128();
+__m128i alpha = _mm_setzero_si128();
+if (has_alpha)
+// 8x(alpha)
+alpha = _mm_set1_epi16(s.fAlphaScale);
+if (sub_y == 0) {
+// Unroll 4x, interleave bytes, use pmaddubsw (all_x is small)
+while (count > 3) {
+count -= 4;
+int x0[4];
+int x1[4];
+__m128i all_x, sixteen_minus_x;
+PrepareConstantsTwoPixelPairs(xy, mask_3FFF, mask_000F,
+sixteen_8bit, mask_dist_select,
+&all_x, &sixteen_minus_x, x0, x1);
+xy += 4;
+// First pair of pixel pairs.
+// (4x(x1, 16-x1), 4x(x0, 16-x0))
+__m128i scale_x;
+scale_x = _mm_unpacklo_epi8(sixteen_minus_x, all_x);
+__m128i sum0 = ProcessPixelPairZeroSubY<has_alpha>(
+row0[x0[0]], row0[x1[0]], row0[x0[1]], row0[x1[1]],
+scale_x, alpha);
+// second pair of pixel pairs
+// (4x (x3, 16-x3), 4x (16-x2, x2))
+scale_x = _mm_unpackhi_epi8(sixteen_minus_x, all_x);
+__m128i sum1 = ProcessPixelPairZeroSubY<has_alpha>(
+row0[x0[2]], row0[x1[2]], row0[x0[3]], row0[x1[3]],
+scale_x, alpha);
+// Pack lower 4 16 bit values of sum into lower 4 bytes.
+sum0 = _mm_packus_epi16(sum0, sum1);
+// Extract low int and store.
+_mm_storeu_si128(reinterpret_cast<__m128i *>(colors), sum0);
+colors += 4;
+}
+// handle remainder
+while (count-- > 0) {
+uint32_t xx = *xy++;  // x0:14 | 4 | x1:14
+unsigned x0 = xx >> 18;
+unsigned x1 = xx & 0x3FFF;
+// 16x(x)
+const __m128i all_x = _mm_set1_epi8((xx >> 14) & 0x0F);
+// (16x(16-x))
+__m128i scale_x = _mm_sub_epi8(sixteen_8bit, all_x);
+scale_x = _mm_unpacklo_epi8(scale_x, all_x);
+__m128i sum = ProcessOnePixelZeroSubY<has_alpha>(
+row0[x0], row0[x1],
+scale_x, alpha);
+// Pack lower 4 16 bit values of sum into lower 4 bytes.
+sum = _mm_packus_epi16(sum, zero);
+// Extract low int and store.
+*colors++ = _mm_cvtsi128_si32(sum);
+}
+} else {  // more general case, y != 0
+// 8x(16)
+const __m128i sixteen_16bit = _mm_set1_epi16(16);
+// 8x (y)
+const __m128i all_y = _mm_set1_epi16(sub_y);
+// 8x (16-y)
+const __m128i neg_y = _mm_sub_epi16(sixteen_16bit, all_y);
+// Unroll 4x, interleave bytes, use pmaddubsw (all_x is small)
+while (count > 3) {
+count -= 4;
+int x0[4];
+int x1[4];
+__m128i all_x, sixteen_minus_x;
+PrepareConstantsTwoPixelPairs(xy, mask_3FFF, mask_000F,
+sixteen_8bit, mask_dist_select,
+&all_x, &sixteen_minus_x, x0, x1);
+xy += 4;
+// First pair of pixel pairs
+// (4x(x1, 16-x1), 4x(x0, 16-x0))
+__m128i scale_x;
+scale_x = _mm_unpacklo_epi8(sixteen_minus_x, all_x);
+__m128i sum0 = ProcessTwoPixelPairs<has_alpha>(
+row0, row1, x0, x1,
+scale_x, all_y, neg_y, alpha);
+// second pair of pixel pairs
+// (4x (x3, 16-x3), 4x (16-x2, x2))
+scale_x = _mm_unpackhi_epi8(sixteen_minus_x, all_x);
+__m128i sum1 = ProcessTwoPixelPairs<has_alpha>(
+row0, row1, x0 + 2, x1 + 2,
+scale_x, all_y, neg_y, alpha);
+// Do the final packing of the two results
+// Pack lower 4 16 bit values of sum into lower 4 bytes.
+sum0 = _mm_packus_epi16(sum0, sum1);
+// Extract low int and store.
+_mm_storeu_si128(reinterpret_cast<__m128i *>(colors), sum0);
+colors += 4;
+}
+// Left over.
+while (count-- > 0) {
+const uint32_t xx = *xy++;  // x0:14 | 4 | x1:14
+const unsigned x0 = xx >> 18;
+const unsigned x1 = xx & 0x3FFF;
+// 16x(x)
+const __m128i all_x = _mm_set1_epi8((xx >> 14) & 0x0F);
+// 16x (16-x)
+__m128i scale_x = _mm_sub_epi8(sixteen_8bit, all_x);
+// (8x (x, 16-x))
+scale_x = _mm_unpacklo_epi8(scale_x, all_x);
+// first row.
+__m128i sum0 = ProcessOnePixel(row0[x0], row0[x1], scale_x, neg_y);
+// second row.
+__m128i sum1 = ProcessOnePixel(row1[x0], row1[x1], scale_x, all_y);
+// Add both rows for full sample
+sum0 = _mm_add_epi16(sum0, sum1);
+sum0 = ScaleFourPixels<has_alpha, 8>(&sum0, alpha);
+// Pack lower 4 16 bit values of sum into lower 4 bytes.
+sum0 = _mm_packus_epi16(sum0, zero);
+// Extract low int and store.
+*colors++ = _mm_cvtsi128_si32(sum0);
+}
+}
+}
+/*
+* Similar to S32_generic_D32_filter_DX_SSSE3, we do not need to handle the
+* special case suby == 0 as suby is changing in every loop.
+*/
+template<bool has_alpha>
+void S32_generic_D32_filter_DXDY_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+SkASSERT(count > 0 && colors != NULL);
+SkASSERT(s.fFilterLevel != SkPaint::kNone_FilterLevel);
+SkASSERT(s.fBitmap->config() == SkBitmap::kARGB_8888_Config);
+if (has_alpha) {
+SkASSERT(s.fAlphaScale < 256);
+} else {
+SkASSERT(s.fAlphaScale == 256);
+}
+const uint8_t* src_addr =
+static_cast<const uint8_t*>(s.fBitmap->getPixels());
+const size_t rb = s.fBitmap->rowBytes();
+// vector constants
+const __m128i mask_dist_select = _mm_set_epi8(12, 12, 12, 12,
+8,  8,  8,  8,
+4,  4,  4,  4,
+0,  0,  0,  0);
+const __m128i mask_3FFF = _mm_set1_epi32(0x3FFF);
+const __m128i mask_000F = _mm_set1_epi32(0x000F);
+const __m128i sixteen_8bit = _mm_set1_epi8(16);
+__m128i alpha;
+if (has_alpha) {
+// 8x(alpha)
+alpha = _mm_set1_epi16(s.fAlphaScale);
+}
+// Unroll 2x, interleave bytes, use pmaddubsw (all_x is small)
+while (count >= 2) {
+int xy0[4];
+int xy1[4];
+__m128i all_xy, sixteen_minus_xy;
+PrepareConstantsTwoPixelPairsDXDY(xy, mask_3FFF, mask_000F,
+sixteen_8bit, mask_dist_select,
+&all_xy, &sixteen_minus_xy, xy0, xy1);
+// (4x(x1, 16-x1), 4x(x0, 16-x0))
+__m128i scale_x = _mm_unpacklo_epi8(sixteen_minus_xy, all_xy);
+// (4x(0, y1), 4x(0, y0))
+__m128i all_y = _mm_unpackhi_epi8(all_xy, _mm_setzero_si128());
+__m128i neg_y = _mm_sub_epi16(_mm_set1_epi16(16), all_y);
+const uint32_t* row00 =
+reinterpret_cast<const uint32_t*>(src_addr + xy0[2] * rb);
+const uint32_t* row01 =
+reinterpret_cast<const uint32_t*>(src_addr + xy1[2] * rb);
+const uint32_t* row10 =
+reinterpret_cast<const uint32_t*>(src_addr + xy0[3] * rb);
+const uint32_t* row11 =
+reinterpret_cast<const uint32_t*>(src_addr + xy1[3] * rb);
+__m128i sum0 = ProcessTwoPixelPairsDXDY<has_alpha>(
+row00, row01, row10, row11, xy0, xy1,
+scale_x, all_y, neg_y, alpha);
+// Pack lower 4 16 bit values of sum into lower 4 bytes.
+sum0 = _mm_packus_epi16(sum0, _mm_setzero_si128());
+// Extract low int and store.
+_mm_storel_epi64(reinterpret_cast<__m128i *>(colors), sum0);
+xy += 4;
+colors += 2;
+count -= 2;
+}
+// Handle the remainder
+while (count-- > 0) {
+uint32_t data = *xy++;
+unsigned y0 = data >> 14;
+unsigned y1 = data & 0x3FFF;
+unsigned subY = y0 & 0xF;
+y0 >>= 4;
+data = *xy++;
+unsigned x0 = data >> 14;
+unsigned x1 = data & 0x3FFF;
+unsigned subX = x0 & 0xF;
+x0 >>= 4;
+const uint32_t* row0 =
+reinterpret_cast<const uint32_t*>(src_addr + y0 * rb);
+const uint32_t* row1 =
+reinterpret_cast<const uint32_t*>(src_addr + y1 * rb);
+// 16x(x)
+const __m128i all_x = _mm_set1_epi8(subX);
+// 16x (16-x)
+__m128i scale_x = _mm_sub_epi8(sixteen_8bit, all_x);
+// (8x (x, 16-x))
+scale_x = _mm_unpacklo_epi8(scale_x, all_x);
+// 8x(16)
+const __m128i sixteen_16bit = _mm_set1_epi16(16);
+// 8x (y)
+const __m128i all_y = _mm_set1_epi16(subY);
+// 8x (16-y)
+const __m128i neg_y = _mm_sub_epi16(sixteen_16bit, all_y);
+// first row.
+__m128i sum0 = ProcessOnePixel(row0[x0], row0[x1], scale_x, neg_y);
+// second row.
+__m128i sum1 = ProcessOnePixel(row1[x0], row1[x1], scale_x, all_y);
+// Add both rows for full sample
+sum0 = _mm_add_epi16(sum0, sum1);
+sum0 = ScaleFourPixels<has_alpha, 8>(&sum0, alpha);
+// Pack lower 4 16 bit values of sum into lower 4 bytes.
+sum0 = _mm_packus_epi16(sum0, _mm_setzero_si128());
+// Extract low int and store.
+*colors++ = _mm_cvtsi128_si32(sum0);
+}
+}
+}  // namepace
+void S32_opaque_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+S32_generic_D32_filter_DX_SSSE3<false>(s, xy, count, colors);
+}
+void S32_alpha_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+S32_generic_D32_filter_DX_SSSE3<true>(s, xy, count, colors);
+}
+void S32_opaque_D32_filter_DXDY_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+S32_generic_D32_filter_DXDY_SSSE3<false>(s, xy, count, colors);
+}
+void S32_alpha_D32_filter_DXDY_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+S32_generic_D32_filter_DXDY_SSSE3<true>(s, xy, count, colors);
+}
+#else // !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) || SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
+void S32_opaque_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+sk_throw();
+}
+void S32_alpha_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+sk_throw();
+}
+void S32_opaque_D32_filter_DXDY_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+sk_throw();
+}
+void S32_alpha_D32_filter_DXDY_SSSE3(const SkBitmapProcState& s,
+const uint32_t* xy,
+int count, uint32_t* colors) {
+sk_throw();
+}
+#endif

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comparison: gfx/skia/trunk/src/opts/SkBitmapProcState_opts_SSSE3.cpp

gfx/skia/trunk/src/opts/SkBitmapProcState_opts_SSSE3.cpp