Port GrGLCaps over to use SkTHash.

src/gpu/gl/GrGLCaps.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 "GrGLCaps.h"
 
@@ skipping 731 matching lines @@
                       GR_GL_IMPLEMENTATION_COLOR_READ_TYPE,
                       &otherType);
 
     return (GrGLenum)otherFormat == format && (GrGLenum)otherType == type;
 }
 
 bool GrGLCaps::readPixelsSupported(const GrGLInterface* intf,
                                    GrGLenum format,
                                    GrGLenum type,
                                    GrGLenum currFboFormat) const {
-
-    ReadPixelsSupportedFormats::Key key = {format, type, currFboFormat};
-
-    ReadPixelsSupportedFormats* cachedValue = fReadPixelsSupportedCache.find(key);
-
-    if (NULL == cachedValue) {
-        bool value = doReadPixelsSupported(intf, format, type);
-        ReadPixelsSupportedFormats newValue(key, value);
-        fReadPixelsSupportedCache.add(newValue);
-
-        return newValue.value();
+    ReadPixelsSupportedFormat key = {format, type, currFboFormat};
+    if (const bool* supported = fReadPixelsSupportedCache.find(key)) {
+        return *supported;
     }
-
-    return cachedValue->value();
+    bool supported = this->doReadPixelsSupported(intf, format, type);
+    fReadPixelsSupportedCache.set(key, supported);
+    return supported;
 }
 
 void GrGLCaps::initFSAASupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
 
     fMSFBOType = kNone_MSFBOType;
     if (kGL_GrGLStandard != ctxInfo.standard()) {
         // We prefer the EXT/IMG extension over ES3 MSAA because we've observed
         // ES3 driver bugs on at least one device with a tiled GPU (N10).
         if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
             fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
@@ skipping 279 matching lines @@
     r.appendf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
     r.appendf("Fragment coord conventions support: %s\n",
              (fFragCoordsConventionSupport ? "YES": "NO"));
     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     r.appendf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     r.appendf("Full screen clear is free: %s\n", (fFullClearIsFree ? "YES" : "NO"));
     r.appendf("Drops tile on zero divide: %s\n", (fDropsTileOnZeroDivide ? "YES" : "NO"));
     return r;
 }