Add specialized content key class for resources.

src/gpu/GrPath.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPath.h"
 
 template<int NumBits> static uint64_t get_top_n_float_bits(float f) {
     char* floatData = reinterpret_cast<char*>(&f);
     uint32_t floatBits = *reinterpret_cast<uint32_t*>(floatData);
     return floatBits >> (32 - NumBits);
 }
 
-GrResourceKey GrPath::ComputeKey(const SkPath& path, const SkStrokeRec& stroke) {
-    static const GrCacheID::Domain gPathDomain = GrCacheID::GenerateDomain();
-
-    GrCacheID::Key key;
-    uint64_t* keyData = key.fData64;
-    keyData[0] = path.getGenerationID();
-    keyData[1] = ComputeStrokeKey(stroke);
-
-    return GrResourceKey(GrCacheID(gPathDomain, key), 0);
+void GrPath::ComputeKey(const SkPath& path, const SkStrokeRec& stroke, GrContentKey* key) {
+    static const GrContentKey::Domain kDomain = GrContentKey::GenerateDomain();
+    GrContentKey::Builder builder(key, kDomain, 3);
+    *reinterpret_cast<uint64_t*>(&builder[0]) = ComputeStrokeKey(stroke);
+    builder[2] = path.getGenerationID();
 }
 
 uint64_t GrPath::ComputeStrokeKey(const SkStrokeRec& stroke) {
     enum {
         kStyleBits = 2,
         kJoinBits = 2,
         kCapBits = 2,
         kWidthBits = 29,
         kMiterBits = 29,
 
@@ skipping 15 matching lines @@
     }
 
     uint64_t key = stroke.getStyle();
     key |= stroke.getJoin() << kJoinShift;
     key |= stroke.getCap() << kCapShift;
     key |= get_top_n_float_bits<kWidthBits>(stroke.getWidth()) << kWidthShift;
     key |= get_top_n_float_bits<kMiterBits>(stroke.getMiter()) << kMiterShift;
 
     return key;
 }