Add SSSE3 acceleration for S32_D16_filter_DXDY

src/opts/opts_check_x86.cpp

Index: src/opts/opts_check_x86.cpp
diff --git a/src/opts/opts_check_x86.cpp b/src/opts/opts_check_x86.cpp
index 8fec2ba69c528040cbb02c2bd603bd1e00120a6f..505004c4adad624f585ac8c4afb4bc6336a69732 100644
--- a/src/opts/opts_check_x86.cpp
+++ b/src/opts/opts_check_x86.cpp
@@ -149,6 +149,7 @@ void SkBitmapProcState::platformProcs() {
     if (!supports_simd(SK_CPU_SSE_LEVEL_SSE2)) {
         return;
     }
+    const bool ssse3 = supports_simd(SK_CPU_SSE_LEVEL_SSSE3);
 
     /* Check fSampleProc32 */
     if (fSampleProc32 == S32_opaque_D32_filter_DX) {
@@ -176,6 +177,8 @@ void SkBitmapProcState::platformProcs() {
     /* Check fSampleProc16 */
     if (fSampleProc16 == S32_D16_filter_DX) {
         fSampleProc16 = S32_D16_filter_DX_SSE2;
+    } else if (ssse3 && fSampleProc16 == S32_D16_filter_DXDY) {
+        fSampleProc16 = S32_D16_filter_DXDY_SSSE3;
     }
 
     /* Check fMatrixProc */