Add SSSE3 acceleration for S32_D16_filter_DXDY

src/opts/SkBitmapProcState_opts_SSSE3.cpp

Index: src/opts/SkBitmapProcState_opts_SSSE3.cpp
diff --git a/src/opts/SkBitmapProcState_opts_SSSE3.cpp b/src/opts/SkBitmapProcState_opts_SSSE3.cpp
index 165f1f5ce068ffe560fa85ddbbaf80f93ad0ea68..99bc19216cf68a8fb10295bb108c42bb8e23577e 100644
--- a/src/opts/SkBitmapProcState_opts_SSSE3.cpp
+++ b/src/opts/SkBitmapProcState_opts_SSSE3.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkBitmapProcState_opts_SSSE3.h"
+#include "SkColorPriv.h"
 #include "SkPaint.h"
 #include "SkUtils.h"
 
@@ -720,17 +721,28 @@ void S32_alpha_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
 }
 
 void S32_opaque_D32_filter_DXDY_SSSE3(const SkBitmapProcState& s,
-                                    const uint32_t* xy,
-                                    int count, uint32_t* colors) {
+                                      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) {
+                                     const uint32_t* xy,
+                                     int count, uint32_t* colors) {
     S32_generic_D32_filter_DXDY_SSSE3<true>(s, xy, count, colors);
 }
 
+void S32_D16_filter_DXDY_SSSE3(const SkBitmapProcState& s,
+                               const uint32_t* xy,
+                               int count, uint16_t* colors) {
+    SkASSERT(64 >= count);
+    SkAutoSTMalloc<64, uint32_t> colors32(count);
+    S32_generic_D32_filter_DXDY_SSSE3<false>(s, xy, count, colors32);
+    for(int i = 0; i < count; i++) {
+        *colors++ = SkPixel32ToPixel16(colors32[i]);
+    }
+}
+
 #else // SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
 
 void S32_opaque_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
@@ -746,14 +758,20 @@ void S32_alpha_D32_filter_DX_SSSE3(const SkBitmapProcState& s,
 }
 
 void S32_opaque_D32_filter_DXDY_SSSE3(const SkBitmapProcState& s,
-                                    const uint32_t* xy,
-                                    int count, uint32_t* colors) {
+                                      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) {
+                                     const uint32_t* xy,
+                                     int count, uint32_t* colors) {
+    sk_throw();
+}
+
+void S32_D16_filter_DXDY_SSSE3(const SkBitmapProcState& s,
+                               const uint32_t* xy,
+                               int count, uint16_t* colors) {
     sk_throw();
 }