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- /*
- * Copyright 2018 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkBitmapProcState_opts_DEFINED
- #define SkBitmapProcState_opts_DEFINED
- #include "src/core/SkBitmapProcState.h"
- // SkBitmapProcState optimized Shader, Sample, or Matrix procs.
- //
- // Only S32_alpha_D32_filter_DX exploits instructions beyond
- // our common baseline SSE2/NEON instruction sets, so that's
- // all that lives here.
- //
- // The rest are scattershot at the moment but I want to get them
- // all migrated to be normal code inside SkBitmapProcState.cpp.
- #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 {
- // This same basic packing scheme is used throughout the file.
- static void decode_packed_coordinates_and_weight(uint32_t packed, int* v0, int* v1, int* w) {
- // The top 14 bits are the integer coordinate x0 or y0.
- *v0 = packed >> 18;
- // The bottom 14 bits are the integer coordinate x1 or y1.
- *v1 = packed & 0x3fff;
- // The middle 4 bits are the interpolating factor between the two, i.e. the weight for v1.
- *w = (packed >> 14) & 0xf;
- }
- #if 1 && SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
- // As above, 4x.
- static void decode_packed_coordinates_and_weight(__m128i packed,
- int v0[4], int v1[4], __m128i* w) {
- _mm_storeu_si128((__m128i*)v0, _mm_srli_epi32(packed, 18));
- _mm_storeu_si128((__m128i*)v1, _mm_and_si128 (packed, _mm_set1_epi32(0x3fff)));
- *w = _mm_and_si128(_mm_srli_epi32(packed, 14), _mm_set1_epi32(0xf));
- }
- // This is the crux of the SSSE3 implementation,
- // interpolating in X for up to two output pixels (A and B) using _mm_maddubs_epi16().
- static inline __m128i interpolate_in_x(uint32_t A0, uint32_t A1,
- uint32_t B0, uint32_t B1,
- const __m128i& interlaced_x_weights) {
- // _mm_maddubs_epi16() is a little idiosyncratic, but very helpful as the core of a lerp.
- //
- // It takes two arguments interlaced byte-wise:
- // - first arg: [ x,y, ... 7 more pairs of 8-bit values ...]
- // - second arg: [ z,w, ... 7 more pairs of 8-bit values ...]
- // and returns 8 16-bit values: [ x*z + y*w, ... 7 more 16-bit values ... ].
- //
- // That's why we go to all this trouble to make interlaced_x_weights,
- // and here we're interlacing A0 with A1, B0 with B1 to match.
- __m128i interlaced_A = _mm_unpacklo_epi8(_mm_cvtsi32_si128(A0), _mm_cvtsi32_si128(A1)),
- interlaced_B = _mm_unpacklo_epi8(_mm_cvtsi32_si128(B0), _mm_cvtsi32_si128(B1));
- return _mm_maddubs_epi16(_mm_unpacklo_epi64(interlaced_A, interlaced_B),
- interlaced_x_weights);
- }
- // Interpolate {A0..A3} --> output pixel A, and {B0..B3} --> output pixel B.
- // Returns two pixels, with each channel in a 16-bit lane of the __m128i.
- static inline __m128i interpolate_in_x_and_y(uint32_t A0, uint32_t A1,
- uint32_t A2, uint32_t A3,
- uint32_t B0, uint32_t B1,
- uint32_t B2, uint32_t B3,
- const __m128i& interlaced_x_weights,
- int wy) {
- // The stored Y weight wy is for y1, and y0 gets a weight 16-wy.
- const __m128i wy1 = _mm_set1_epi16(wy),
- wy0 = _mm_sub_epi16(_mm_set1_epi16(16), wy1);
- // First interpolate in X,
- // leaving the values in 16-bit lanes scaled up by those [0,16] interlaced_x_weights.
- __m128i row0 = interpolate_in_x(A0,A1, B0,B1, interlaced_x_weights),
- row1 = interpolate_in_x(A2,A3, B2,B3, interlaced_x_weights);
- // Interpolate in Y across the two rows,
- // then scale everything down by the maximum total weight 16x16 = 256.
- return _mm_srli_epi16(_mm_add_epi16(_mm_mullo_epi16(row0, wy0),
- _mm_mullo_epi16(row1, wy1)), 8);
- }
- /*not static*/ inline
- void S32_alpha_D32_filter_DX(const SkBitmapProcState& s,
- const uint32_t* xy, int count, uint32_t* colors) {
- SkASSERT(count > 0 && colors != nullptr);
- SkASSERT(s.fFilterQuality != kNone_SkFilterQuality);
- SkASSERT(kN32_SkColorType == s.fPixmap.colorType());
- int alpha = s.fAlphaScale;
- // Return (px * s.fAlphaScale) / 256. (s.fAlphaScale is in [0,256].)
- auto scale_by_alpha = [alpha](const __m128i& px) {
- return alpha == 256 ? px
- : _mm_srli_epi16(_mm_mullo_epi16(px, _mm_set1_epi16(alpha)), 8);
- };
- // We're in _DX_ mode here, so we're only varying in X.
- // That means the first entry of xy is our constant pair of Y coordinates and weight in Y.
- // All the other entries in xy will be pairs of X coordinates and the X weight.
- int y0, y1, wy;
- decode_packed_coordinates_and_weight(*xy++, &y0, &y1, &wy);
- auto row0 = (const uint32_t*)((const uint8_t*)s.fPixmap.addr() + y0 * s.fPixmap.rowBytes()),
- row1 = (const uint32_t*)((const uint8_t*)s.fPixmap.addr() + y1 * s.fPixmap.rowBytes());
- while (count >= 4) {
- // We can really get going, loading 4 X pairs at a time to produce 4 output pixels.
- const __m128i xx = _mm_loadu_si128((const __m128i*)xy);
- int x0[4],
- x1[4];
- __m128i wx;
- decode_packed_coordinates_and_weight(xx, x0, x1, &wx);
- // Splat out each x weight wx four times (one for each pixel channel) as wx1,
- // and sixteen minus that as the weight for x0, wx0.
- __m128i wx1 = _mm_shuffle_epi8(wx, _mm_setr_epi8(0,0,0,0,4,4,4,4,8,8,8,8,12,12,12,12)),
- wx0 = _mm_sub_epi8(_mm_set1_epi8(16), wx1);
- // We need to interlace wx0 and wx1 for _mm_maddubs_epi16().
- __m128i interlaced_x_weights_AB = _mm_unpacklo_epi8(wx0,wx1),
- interlaced_x_weights_CD = _mm_unpackhi_epi8(wx0,wx1);
- // interpolate_in_x_and_y() can produce two output pixels (A and B) at a time
- // from eight input pixels {A0..A3} and {B0..B3}, arranged in a 2x2 grid for each.
- __m128i AB = interpolate_in_x_and_y(row0[x0[0]], row0[x1[0]],
- row1[x0[0]], row1[x1[0]],
- row0[x0[1]], row0[x1[1]],
- row1[x0[1]], row1[x1[1]],
- interlaced_x_weights_AB, wy);
- // Once more with the other half of the x-weights for two more pixels C,D.
- __m128i CD = interpolate_in_x_and_y(row0[x0[2]], row0[x1[2]],
- row1[x0[2]], row1[x1[2]],
- row0[x0[3]], row0[x1[3]],
- row1[x0[3]], row1[x1[3]],
- interlaced_x_weights_CD, wy);
- // Scale by alpha, pack back together to 8-bit lanes, and write out four pixels!
- _mm_storeu_si128((__m128i*)colors, _mm_packus_epi16(scale_by_alpha(AB),
- scale_by_alpha(CD)));
- xy += 4;
- colors += 4;
- count -= 4;
- }
- while (count --> 0) {
- // This is exactly the same flow as the count >= 4 loop above, but writing one pixel.
- int x0, x1, wx;
- decode_packed_coordinates_and_weight(*xy++, &x0, &x1, &wx);
- // As above, splat out wx four times as wx1, and sixteen minus that as wx0.
- __m128i wx1 = _mm_set1_epi8(wx), // This splats it out 16 times, but that's fine.
- wx0 = _mm_sub_epi8(_mm_set1_epi8(16), wx1);
- __m128i interlaced_x_weights_A = _mm_unpacklo_epi8(wx0, wx1);
- __m128i A = interpolate_in_x_and_y(row0[x0], row0[x1],
- row1[x0], row1[x1],
- 0, 0,
- 0, 0,
- interlaced_x_weights_A, wy);
- *colors++ = _mm_cvtsi128_si32(_mm_packus_epi16(scale_by_alpha(A), _mm_setzero_si128()));
- }
- }
- #elif 1 && SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
- // TODO(mtklein): clean up this code, use decode_packed_coordinates_and_weight(), etc.
- /*not static*/ inline
- void S32_alpha_D32_filter_DX(const SkBitmapProcState& s,
- const uint32_t* xy, int count, uint32_t* colors) {
- SkASSERT(count > 0 && colors != nullptr);
- SkASSERT(s.fFilterQuality != kNone_SkFilterQuality);
- SkASSERT(kN32_SkColorType == s.fPixmap.colorType());
- SkASSERT(s.fAlphaScale <= 256);
- int y0, y1, wy;
- decode_packed_coordinates_and_weight(*xy++, &y0, &y1, &wy);
- auto row0 = (const uint32_t*)( (const char*)s.fPixmap.addr() + y0 * s.fPixmap.rowBytes() ),
- row1 = (const uint32_t*)( (const char*)s.fPixmap.addr() + y1 * s.fPixmap.rowBytes() );
- // We'll put one pixel in the low 4 16-bit lanes to line up with wy,
- // and another in the upper 4 16-bit lanes to line up with 16 - wy.
- const __m128i allY = _mm_unpacklo_epi64(_mm_set1_epi16( wy),
- _mm_set1_epi16(16-wy));
- while (count --> 0) {
- int x0, x1, wx;
- decode_packed_coordinates_and_weight(*xy++, &x0, &x1, &wx);
- // Load the 4 pixels we're interpolating.
- const __m128i a00 = _mm_cvtsi32_si128(row0[x0]),
- a01 = _mm_cvtsi32_si128(row0[x1]),
- a10 = _mm_cvtsi32_si128(row1[x0]),
- a11 = _mm_cvtsi32_si128(row1[x1]);
- // Line up low-x pixels a00 and a10 with allY.
- __m128i a00a10 = _mm_unpacklo_epi8(_mm_unpacklo_epi32(a10, a00),
- _mm_setzero_si128());
- // Scale by allY and 16-wx.
- a00a10 = _mm_mullo_epi16(a00a10, allY);
- a00a10 = _mm_mullo_epi16(a00a10, _mm_set1_epi16(16-wx));
- // Line up high-x pixels a01 and a11 with allY.
- __m128i a01a11 = _mm_unpacklo_epi8(_mm_unpacklo_epi32(a11, a01),
- _mm_setzero_si128());
- // Scale by allY and wx.
- a01a11 = _mm_mullo_epi16(a01a11, allY);
- a01a11 = _mm_mullo_epi16(a01a11, _mm_set1_epi16(wx));
- // Add the two intermediates, summing across in one direction.
- __m128i halves = _mm_add_epi16(a00a10, a01a11);
- // Add the two halves to each other to sum in the other direction.
- __m128i sum = _mm_add_epi16(halves, _mm_srli_si128(halves, 8));
- // Get back to [0,255] by dividing by maximum weight 16x16 = 256.
- sum = _mm_srli_epi16(sum, 8);
- if (s.fAlphaScale < 256) {
- // Scale by alpha, which is in [0,256].
- sum = _mm_mullo_epi16(sum, _mm_set1_epi16(s.fAlphaScale));
- sum = _mm_srli_epi16(sum, 8);
- }
- // Pack back into 8-bit values and store.
- *colors++ = _mm_cvtsi128_si32(_mm_packus_epi16(sum, _mm_setzero_si128()));
- }
- }
- #else
- // The NEON code only actually differs from the portable code in the
- // filtering step after we've loaded all four pixels we want to bilerp.
- #if defined(SK_ARM_HAS_NEON)
- static void filter_and_scale_by_alpha(unsigned x, unsigned y,
- SkPMColor a00, SkPMColor a01,
- SkPMColor a10, SkPMColor a11,
- SkPMColor *dst,
- uint16_t scale) {
- uint8x8_t vy, vconst16_8, v16_y, vres;
- uint16x4_t vx, vconst16_16, v16_x, tmp, vscale;
- uint32x2_t va0, va1;
- uint16x8_t tmp1, tmp2;
- vy = vdup_n_u8(y); // duplicate y into vy
- vconst16_8 = vmov_n_u8(16); // set up constant in vconst16_8
- v16_y = vsub_u8(vconst16_8, vy); // v16_y = 16-y
- va0 = vdup_n_u32(a00); // duplicate a00
- va1 = vdup_n_u32(a10); // duplicate a10
- va0 = vset_lane_u32(a01, va0, 1); // set top to a01
- va1 = vset_lane_u32(a11, va1, 1); // set top to a11
- tmp1 = vmull_u8(vreinterpret_u8_u32(va0), v16_y); // tmp1 = [a01|a00] * (16-y)
- tmp2 = vmull_u8(vreinterpret_u8_u32(va1), vy); // tmp2 = [a11|a10] * y
- vx = vdup_n_u16(x); // duplicate x into vx
- vconst16_16 = vmov_n_u16(16); // set up constant in vconst16_16
- v16_x = vsub_u16(vconst16_16, vx); // v16_x = 16-x
- tmp = vmul_u16(vget_high_u16(tmp1), vx); // tmp = a01 * x
- tmp = vmla_u16(tmp, vget_high_u16(tmp2), vx); // tmp += a11 * x
- tmp = vmla_u16(tmp, vget_low_u16(tmp1), v16_x); // tmp += a00 * (16-x)
- tmp = vmla_u16(tmp, vget_low_u16(tmp2), v16_x); // tmp += a10 * (16-x)
- if (scale < 256) {
- vscale = vdup_n_u16(scale); // duplicate scale
- tmp = vshr_n_u16(tmp, 8); // shift down result by 8
- tmp = vmul_u16(tmp, vscale); // multiply result by scale
- }
- vres = vshrn_n_u16(vcombine_u16(tmp, vcreate_u16(0)), 8); // shift down result by 8
- vst1_lane_u32(dst, vreinterpret_u32_u8(vres), 0); // store result
- }
- #else
- static void filter_and_scale_by_alpha(unsigned x, unsigned y,
- SkPMColor a00, SkPMColor a01,
- SkPMColor a10, SkPMColor a11,
- SkPMColor* dstColor,
- unsigned alphaScale) {
- SkASSERT((unsigned)x <= 0xF);
- SkASSERT((unsigned)y <= 0xF);
- SkASSERT(alphaScale <= 256);
- int xy = x * y;
- const uint32_t mask = 0xFF00FF;
- int scale = 256 - 16*y - 16*x + xy;
- uint32_t lo = (a00 & mask) * scale;
- uint32_t hi = ((a00 >> 8) & mask) * scale;
- scale = 16*x - xy;
- lo += (a01 & mask) * scale;
- hi += ((a01 >> 8) & mask) * scale;
- scale = 16*y - xy;
- lo += (a10 & mask) * scale;
- hi += ((a10 >> 8) & mask) * scale;
- lo += (a11 & mask) * xy;
- hi += ((a11 >> 8) & mask) * xy;
- if (alphaScale < 256) {
- lo = ((lo >> 8) & mask) * alphaScale;
- hi = ((hi >> 8) & mask) * alphaScale;
- }
- *dstColor = ((lo >> 8) & mask) | (hi & ~mask);
- }
- #endif
- /*not static*/ inline
- void S32_alpha_D32_filter_DX(const SkBitmapProcState& s,
- const uint32_t* xy, int count, SkPMColor* colors) {
- SkASSERT(count > 0 && colors != nullptr);
- SkASSERT(s.fFilterQuality != kNone_SkFilterQuality);
- SkASSERT(4 == s.fPixmap.info().bytesPerPixel());
- SkASSERT(s.fAlphaScale <= 256);
- int y0, y1, wy;
- decode_packed_coordinates_and_weight(*xy++, &y0, &y1, &wy);
- auto row0 = (const uint32_t*)( (const char*)s.fPixmap.addr() + y0 * s.fPixmap.rowBytes() ),
- row1 = (const uint32_t*)( (const char*)s.fPixmap.addr() + y1 * s.fPixmap.rowBytes() );
- while (count --> 0) {
- int x0, x1, wx;
- decode_packed_coordinates_and_weight(*xy++, &x0, &x1, &wx);
- filter_and_scale_by_alpha(wx, wy,
- row0[x0], row0[x1],
- row1[x0], row1[x1],
- colors++,
- s.fAlphaScale);
- }
- }
- #endif
- } // namespace SK_OPTS_NS
- #endif
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