Add SSSE3 acceleration for S32_D16_filter_DXDY

src/opts/opts_check_x86.cpp

 /*
  * Copyright 2009 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 "SkBitmapFilter_opts_SSE2.h"
 #include "SkBitmapProcState_opts_SSE2.h"
 #include "SkBitmapProcState_opts_SSSE3.h"
@@ skipping 158 matching lines @@
         }
     } else if (fSampleProc32 == S32_alpha_D32_filter_DXDY) {
         if (supports_simd(SK_CPU_SSE_LEVEL_SSSE3)) {
             fSampleProc32 = S32_alpha_D32_filter_DXDY_SSSE3;
         }
     }
 
     /* Check fSampleProc16 */
     if (fSampleProc16 == S32_D16_filter_DX) {
         fSampleProc16 = S32_D16_filter_DX_SSE2;
+    } else if (fSampleProc16 == S32_D16_filter_DXDY) {
+        fSampleProc16 = S32_D16_filter_DXDY_SSSE3;

[mtklein, 2014/12/02 15:19:05]

We need to check supports_simd(SK_CPU_SSE_LEVEL_SSSE3).

Why don't we pull that out into a local constant so it's more obvious?

if (!supports_simd(SK_CPU_SSE_LEVEL_SSE2)) {
   return;
}
const bool ssse3 = supports_simd(SK_CPU_SSE_LEVEL_SSSE3);
...

} else if (ssse3 && fSampleProc16 == S32_D16_filter_DXDY) {
   fSampleProc16 = S32_D16_filter_DXDY_SSSE3;
}
...

[qiankun1, 2014/12/02 15:58:43]

Done.

     }
 
     /* Check fMatrixProc */
     if (fMatrixProc == ClampX_ClampY_filter_scale) {
         fMatrixProc = ClampX_ClampY_filter_scale_SSE2;
     } else if (fMatrixProc == ClampX_ClampY_nofilter_scale) {
         fMatrixProc = ClampX_ClampY_nofilter_scale_SSE2;
     } else if (fMatrixProc == ClampX_ClampY_filter_affine) {
         fMatrixProc = ClampX_ClampY_filter_affine_SSE2;
     } else if (fMatrixProc == ClampX_ClampY_nofilter_affine) {
@@ skipping 210 matching lines @@
     } else {
         return SkPlatformXfermodeFactory_impl(rec, mode);
     }
 }
 
 SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode);
 
 SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode) {
     return NULL;
 }