Implement fast, correct gamma conversion for color xforms

src/opts/SkOpts_sse41.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOpts.h"
 
 #define SK_OPTS_NS sk_sse41
 #include "SkBlurImageFilter_opts.h"
 #include "SkBlitRow_opts.h"
 #include "SkBlend_opts.h"
+#include "SkColorXform_opts.h"
 
 #ifndef SK_SUPPORT_LEGACY_X86_BLITS
 
 namespace sk_sse41_new {
 
 // An SSE register holding at most 64 bits of useful data in the low lanes.
 struct m64i {
     __m128i v;
     /*implicit*/ m64i(__m128i v) : v(v) {}
     operator __m128i() const { return v; }
@@ skipping 197 matching lines @@
         box_blur_xx       = sk_sse41::box_blur_xx;
         box_blur_xy       = sk_sse41::box_blur_xy;
         box_blur_yx       = sk_sse41::box_blur_yx;
         srcover_srgb_srgb = sk_sse41::srcover_srgb_srgb;
 
     #ifndef SK_SUPPORT_LEGACY_X86_BLITS
         blit_row_color32 = sk_sse41_new::blit_row_color32;
         blit_mask_d32_a8 = sk_sse41_new::blit_mask_d32_a8;
     #endif
         blit_row_s32a_opaque = sk_sse41::blit_row_s32a_opaque;
+
+        color_xform_RGB1_srgb_to_2dot2  = sk_sse41::color_xform_RGB1_srgb_to_2dot2;
+        color_xform_RGB1_2dot2_to_2dot2 = sk_sse41::color_xform_RGB1_2dot2_to_2dot2;
     }
 }