Lay groundwork for SkOpts.

This doesn't really do anything yet.  It's just the CPU detection code, skeleton new .cpp files, and a few little .gyp tweaks.

BUG=skia:4117

Review URL: https://codereview.chromium.org/1255193002

gyp/core.gypi

@@ -134,6 +134,7 @@
         '<(skia_src_path)/core/SkMiniRecorder.cpp',
         '<(skia_src_path)/core/SkMultiPictureDraw.cpp',
         '<(skia_src_path)/core/SkNinePatchIter.cpp',
+        '<(skia_src_path)/core/SkOpts.cpp',
         '<(skia_src_path)/core/SkPackBits.cpp',
         '<(skia_src_path)/core/SkPaint.cpp',
         '<(skia_src_path)/core/SkPaintPriv.cpp',

gyp/opts.gyp

@@ -105,6 +105,7 @@
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [ 'core.gyp:*' ],
+      'include_dirs': [ '../src/core' ],
       'sources': [ '<@(sse41_sources)' ],
       'conditions': [
         [ 'skia_os == "win"', {

gyp/opts.gypi

@@ -34,6 +34,7 @@
             '<(skia_src_path)/opts/SkTextureCompression_opts_neon.cpp',
             '<(skia_src_path)/opts/SkUtils_opts_arm_neon.cpp',
             '<(skia_src_path)/opts/SkXfermode_opts_arm_neon.cpp',
+            '<(skia_src_path)/opts/SkOpts_neon.cpp',
         ],
         'arm64_sources': [
             '<(skia_src_path)/opts/SkBitmapProcState_arm_neon.cpp',
@@ -51,6 +52,7 @@
             '<(skia_src_path)/opts/SkUtils_opts_none.cpp',
             '<(skia_src_path)/opts/SkXfermode_opts_arm.cpp',
             '<(skia_src_path)/opts/SkXfermode_opts_arm_neon.cpp',
+            '<(skia_src_path)/opts/SkOpts_neon.cpp',
         ],
 
         'mips_dsp_sources': [
@@ -74,12 +76,15 @@
             '<(skia_src_path)/opts/SkUtils_opts_SSE2.cpp',
             '<(skia_src_path)/opts/SkXfermode_opts_none.cpp',
             '<(skia_src_path)/opts/opts_check_x86.cpp',
+            '<(skia_src_path)/opts/SkOpts_sse2.cpp',
         ],
         'ssse3_sources': [
             '<(skia_src_path)/opts/SkBitmapProcState_opts_SSSE3.cpp',
+            '<(skia_src_path)/opts/SkOpts_ssse3.cpp',
         ],
         'sse41_sources': [
             '<(skia_src_path)/opts/SkBlurImage_opts_SSE4.cpp',
             '<(skia_src_path)/opts/SkBlitRow_opts_SSE4.cpp',
+            '<(skia_src_path)/opts/SkOpts_sse41.cpp',
         ],
 }

src/core/SkGraphics.cpp

@@ -14,6 +14,7 @@
 #include "SkGeometry.h"
 #include "SkMath.h"
 #include "SkMatrix.h"
+#include "SkOpts.h"
 #include "SkPath.h"
 #include "SkPathEffect.h"
 #include "SkPixelRef.h"
@@ -50,6 +51,7 @@ void SkGraphics::GetVersion(int32_t* major, int32_t* minor, int32_t* patch) {
 #endif
 
 void SkGraphics::Init() {
+    SkOpts::Init();
 #ifdef SK_DEVELOPER
     skRTConfRegistry().possiblyDumpFile();
     skRTConfRegistry().validate();

src/core/SkOpts.cpp

@@ -0,0 +1,48 @@
+/*
+ * 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"
+
+#if defined(SK_CPU_X86)
+    #if defined(SK_BUILD_FOR_WIN32)
+        #include <intrin.h>
+        static void cpuid(uint32_t abcd[4]) { __cpuid((int*)abcd, 1); }
+    #else
+        #include <cpuid.h>
+        static void cpuid(uint32_t abcd[4]) { __get_cpuid(1, abcd+0, abcd+1, abcd+2, abcd+3); }
+    #endif
+#elif defined(SK_BUILD_FOR_ANDROID)
+    #include <cpu-features.h>
+#endif
+
+namespace SkOpts {
+    // (Define default function pointer values here...)
+
+    // Each Init_foo() is defined in src/opts/SkOpts_foo.cpp.
+    void Init_sse2();
+    void Init_ssse3();
+    void Init_sse41();
+    void Init_neon();
+    //TODO: _dsp2, _armv7, _armv8, _x86, _x86_64, _sse42, _avx, avx2, ... ?
+
+    void Init() {
+    #if defined(SK_CPU_X86)
+        uint32_t abcd[] = {0,0,0,0};
+        cpuid(abcd);
+        if (abcd[3] & (1<<26)) { Init_sse2(); }
+        if (abcd[2] & (1<< 9)) { Init_ssse3(); }
+        if (abcd[2] & (1<<19)) { Init_sse41(); }
+
+    #elif defined(SK_ARM_HAS_NEON)
+        Init_neon();
+
+    #elif defined(SK_BUILD_FOR_ANDROID)
+        if (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) { Init_neon(); }
+
+    #endif
+    }
+}

src/core/SkOpts.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkOpts_DEFINED
+#define SkOpts_DEFINED
+
+#include "SkTypes.h"
+
+namespace SkOpts {
+    // Called by SkGraphics::Init().
+    // It's not thread safe, but it's fine to call more than once.
+    // If Init() were somehow not called, that'd also be fine: you'll get portable fallbacks.
+    void Init();
+
+    // (Function pointers go here).
+}
+
+#endif//SkOpts_DEFINED

src/opts/SkOpts_neon.cpp

@@ -0,0 +1,14 @@
+/*
+ * 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"
+
+namespace SkOpts {
+    void Init_neon() {
+
+    }
+}

src/opts/SkOpts_sse2.cpp

@@ -0,0 +1,14 @@
+/*
+ * 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"
+
+namespace SkOpts {
+    void Init_sse2() {
+
+    }
+}

src/opts/SkOpts_sse41.cpp

@@ -0,0 +1,14 @@
+/*
+ * 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"
+
+namespace SkOpts {
+    void Init_sse41() {
+
+    }
+}

src/opts/SkOpts_ssse3.cpp

@@ -0,0 +1,14 @@
+/*
+ * 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"
+
+namespace SkOpts {
+    void Init_ssse3() {
+
+    }
+}