Expose functionality to purge the GPU texture cache while running SampleApp.

Press 'p' to purge the cache.  A summary of the number of bytes of video memory
released is output to the command prompt.
Review URL: https://codereview.appspot.com/5587045

git-svn-id: http://skia.googlecode.com/svn/trunk@3097 2bbb7eff-a529-9590-31e7-b0007b416f81

4 files changed, 25 insertions, 2 deletions

diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index d27b963d92..ca440a6243 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -75,6 +75,11 @@ public:
      */
     void freeGpuResources();
 
+    /**
+     * Returns the number of bytes of GPU memory hosted by the texture cache.
+     */
+    size_t getGpuTextureCacheBytes() const;
+
     ///////////////////////////////////////////////////////////////////////////
     // Textures
 
@@ -858,4 +863,3 @@ private:
 };
 
 #endif
-
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index d3d2aa708a..898bda0be8 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1537,6 +1537,17 @@ bool SampleWindow::onHandleChar(SkUnichar uni) {
                 this->updateTitle();
             }
             return true;
+        case 'p':
+            {
+                GrContext* grContext = this->getGrContext();
+                if (grContext) {
+                    size_t cacheBytes = grContext->getGpuTextureCacheBytes();
+                    grContext->freeGpuResources();
+                    SkDebugf("Purged %d bytes from the GPU resource cache.\n",
+                             cacheBytes);
+                }
+            }
+            return true;
         case 's':
             fScale = !fScale;
             this->inval(NULL);
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 2132ed6ea7..975f6d0b90 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -115,6 +115,10 @@ void GrContext::freeGpuResources() {
     GrSafeSetNull(fPathRendererChain);
 }
 
+size_t GrContext::getGpuTextureCacheBytes() const {
+  return fTextureCache->getCachedResourceBytes();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 int GrContext::PaintStageVertexLayoutBits(
diff --git a/src/gpu/GrResourceCache.h b/src/gpu/GrResourceCache.h
index e21c6050a1..f86fcd270f 100644
--- a/src/gpu/GrResourceCache.h
+++ b/src/gpu/GrResourceCache.h
@@ -209,6 +209,11 @@ public:
     void setLimits(int maxResource, size_t maxResourceBytes);
 
     /**
+     * Returns the number of bytes consumed by cached resources.
+     */
+    size_t getCachedResourceBytes() const { return fEntryBytes; }
+
+    /**
      * Controls whether locks should be nestable or not.
      */
     enum LockType {
@@ -315,4 +320,3 @@ private:
 #endif
 
 #endif
-