skeleton for float <-> half optimized procs

src/core/SkOpts.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 "SkHalf.h"
 #include "SkOnce.h"
 #include "SkOpts.h"
 
 #define SK_OPTS_NS sk_default
 #include "SkBlitMask_opts.h"
 #include "SkBlitRow_opts.h"
 #include "SkBlurImageFilter_opts.h"
 #include "SkColorCubeFilter_opts.h"
 #include "SkMatrix_opts.h"
 #include "SkMorphologyImageFilter_opts.h"
 #include "SkSwizzler_opts.h"
 #include "SkTextureCompressor_opts.h"
 #include "SkUtils_opts.h"
 #include "SkXfermode_opts.h"
 
+namespace SK_OPTS_NS {
+    static void float_to_half(uint16_t dst[], const float src[], int n) {
+        while (n-->0) {
+            *dst++ = SkFloatToHalf(*src++);
+        }
+    }
+    static void half_to_float(float dst[], const uint16_t src[], int n) {
+        while (n-->0) {
+            *dst++ = SkHalfToFloat(*src++);
+        }
+    }
+}
+
 #if defined(SK_CPU_X86) && !defined(SK_BUILD_FOR_IOS)
     #if defined(SK_BUILD_FOR_WIN32)
         #include <intrin.h>
         static void cpuid (uint32_t abcd[4]) { __cpuid  ((int*)abcd, 1);    }
         static void cpuid7(uint32_t abcd[4]) { __cpuidex((int*)abcd, 7, 0); }
         static uint64_t xgetbv(uint32_t xcr) { return _xgetbv(xcr); }
     #else
         #include <cpuid.h>
         #if !defined(__cpuid_count)  // Old Mac Clang doesn't have this defined.
             #define  __cpuid_count(eax, ecx, a, b, c, d) \
@@ skipping 50 matching lines @@
     decltype(RGBA_to_rgbA)          RGBA_to_rgbA          = sk_default::RGBA_to_rgbA;
     decltype(RGBA_to_bgrA)          RGBA_to_bgrA          = sk_default::RGBA_to_bgrA;
     decltype(RGB_to_RGB1)           RGB_to_RGB1           = sk_default::RGB_to_RGB1;
     decltype(RGB_to_BGR1)           RGB_to_BGR1           = sk_default::RGB_to_BGR1;
     decltype(gray_to_RGB1)          gray_to_RGB1          = sk_default::gray_to_RGB1;
     decltype(grayA_to_RGBA)         grayA_to_RGBA         = sk_default::grayA_to_RGBA;
     decltype(grayA_to_rgbA)         grayA_to_rgbA         = sk_default::grayA_to_rgbA;
     decltype(inverted_CMYK_to_RGB1) inverted_CMYK_to_RGB1 = sk_default::inverted_CMYK_to_RGB1;
     decltype(inverted_CMYK_to_BGR1) inverted_CMYK_to_BGR1 = sk_default::inverted_CMYK_to_BGR1;
 
+    decltype(half_to_float) half_to_float = sk_default::half_to_float;
+    decltype(float_to_half) float_to_half = sk_default::float_to_half;
+
     // Each Init_foo() is defined in src/opts/SkOpts_foo.cpp.
     void Init_ssse3();
     void Init_sse41();
     void Init_sse42() {}
     void Init_avx() {}
     void Init_avx2() {}
     void Init_neon();
 
     static void init() {
         // TODO: Chrome's not linking _sse* opts on iOS simulator builds.  Bug or feature?
@@ skipping 25 matching lines @@
 
     SK_DECLARE_STATIC_ONCE(gInitOnce);
     void Init() { SkOnce(&gInitOnce, init); }
 
 #if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
     static struct AutoInit {
         AutoInit() { Init(); }
     } gAutoInit;
 #endif
 }