Port SkBlurImage opts to SkOpts.

src/opts/SkBlurImage_opts_SSE4.cpp

Index: src/opts/SkBlurImage_opts_SSE4.cpp
diff --git a/src/opts/SkBlurImage_opts_SSE4.cpp b/src/opts/SkBlurImage_opts_SSE4.cpp
deleted file mode 100644
index 34da9403d9b04936ac0cd2811098e96e7d130165..0000000000000000000000000000000000000000
--- a/src/opts/SkBlurImage_opts_SSE4.cpp
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
- * Copyright 2014 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 "SkBitmap.h"
-#include "SkBlurImage_opts_SSE4.h"
-#include "SkColorPriv.h"
-#include "SkRect.h"
-
-/* With the exception of the compilers that don't support it, we always build the
- * SSE4 functions and enable the caller to determine SSE4 support.  However for
- * compilers that do not support SSE4x we provide a stub implementation.
- */
-#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41
-
-#include <smmintrin.h>
-
-namespace {
-enum BlurDirection {
-    kX, kY
-};
-
-/* Helper function to spread the components of a 32-bit integer into the
- * lower 8 bits of each 32-bit element of an SSE register.
- */
-inline __m128i expand(int a) {
-    // ARGB -> 0000 0000 0000 ARGB
-    __m128i widened = _mm_cvtsi32_si128(a);
-    // SSE4.1 has xxxx xxxx xxxx ARGB -> 000A 000R 000G 000B as a one-stop-shop instruction.
-    // It can even work from memory, so a smart compiler probably merges in the _mm_cvtsi32_si128().
-    return _mm_cvtepu8_epi32(widened);
-}
-
-template<BlurDirection srcDirection, BlurDirection dstDirection>
-void SkBoxBlur_SSE4(const SkPMColor* src, int srcStride, SkPMColor* dst, int kernelSize,
-                    int leftOffset, int rightOffset, int width, int height)
-{
-    const int rightBorder = SkMin32(rightOffset + 1, width);
-    const int srcStrideX = srcDirection == kX ? 1 : srcStride;
-    const int dstStrideX = dstDirection == kX ? 1 : height;
-    const int srcStrideY = srcDirection == kX ? srcStride : 1;
-    const int dstStrideY = dstDirection == kX ? width : 1;
-    const __m128i scale = _mm_set1_epi32((1 << 24) / kernelSize);
-    const __m128i half = _mm_set1_epi32(1 << 23);
-    for (int y = 0; y < height; ++y) {
-        __m128i sum = _mm_setzero_si128();
-        const SkPMColor* p = src;
-        for (int i = 0; i < rightBorder; ++i) {
-            sum = _mm_add_epi32(sum, expand(*p));
-            p += srcStrideX;
-        }
-
-        const SkPMColor* sptr = src;
-        SkColor* dptr = dst;
-        for (int x = 0; x < width; ++x) {
-            // TODO(mtklein): We are working in 8.24 here. Drop to 8.8 when the kernel is narrow?
-
-            // Multiply each component by scale (i.e. divide by kernel size) and add half to round.
-            __m128i result = _mm_mullo_epi32(sum, scale);
-            result = _mm_add_epi32(result, half);
-
-            // Now pack the top byte of each 32-bit lane back down into one 32-bit color.
-            // Axxx Rxxx Gxxx Bxxx -> xxxx xxxx xxxx ARGB
-            const char _ = 0;  // Don't care what ends up in these bytes.  Happens to be byte 0.
-            result = _mm_shuffle_epi8(result, _mm_set_epi8(_,_,_,_, _,_,_,_, _,_,_,_, 15,11,7,3));
-
-            *dptr = _mm_cvtsi128_si32(result);
-
-            // TODO(mtklein): experiment with breaking this loop into 3 parts
-            if (x >= leftOffset) {
-                SkColor l = *(sptr - leftOffset * srcStrideX);
-                sum = _mm_sub_epi32(sum, expand(l));
-            }
-            if (x + rightOffset + 1 < width) {
-                SkColor r = *(sptr + (rightOffset + 1) * srcStrideX);
-                sum = _mm_add_epi32(sum, expand(r));
-            }
-            sptr += srcStrideX;
-            if (srcDirection == kY) {
-                // TODO(mtklein): experiment with moving this prefetch forward
-                _mm_prefetch(reinterpret_cast<const char*>(sptr + (rightOffset + 1) * srcStrideX),
-                             _MM_HINT_T0);
-            }
-            dptr += dstStrideX;
-        }
-        src += srcStrideY;
-        dst += dstStrideY;
-    }
-}
-
-} // namespace
-
-bool SkBoxBlurGetPlatformProcs_SSE4(SkBoxBlurProc* boxBlurX,
-                                    SkBoxBlurProc* boxBlurXY,
-                                    SkBoxBlurProc* boxBlurYX) {
-    *boxBlurX = SkBoxBlur_SSE4<kX, kX>;
-    *boxBlurXY = SkBoxBlur_SSE4<kX, kY>;
-    *boxBlurYX = SkBoxBlur_SSE4<kY, kX>;
-    return true;
-}
-
-#else // SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41
-
-bool SkBoxBlurGetPlatformProcs_SSE4(SkBoxBlurProc* boxBlurX,
-                                    SkBoxBlurProc* boxBlurXY,
-                                    SkBoxBlurProc* boxBlurYX) {
-    sk_throw();
-    return false;
-}
-
-
-#endif