1 files changed, 94 insertions, 0 deletions
diff --git a/cc/overdraw_metrics.h b/cc/overdraw_metrics.h
index 638cbb2..b907a64 100644
--- a/cc/overdraw_metrics.h
+++ b/cc/overdraw_metrics.h
@@ -1,3 +1,97 @@
 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+
+#ifndef CCOverdrawMetrics_h
+#define CCOverdrawMetrics_h
+
+#include <wtf/PassOwnPtr.h>
+
+namespace WebKit {
+class WebTransformationMatrix;
+}
+
+namespace cc {
+class IntRect;
+class CCLayerTreeHost;
+class CCLayerTreeHostImpl;
+
+// FIXME: compute overdraw metrics only occasionally, not every frame.
+class CCOverdrawMetrics {
+public:
+    static PassOwnPtr<CCOverdrawMetrics> create(bool recordMetricsForFrame) { return adoptPtr(new CCOverdrawMetrics(recordMetricsForFrame)); }
+
+    // These methods are used for saving metrics during update/commit.
+
+    // Record pixels painted by WebKit into the texture updater, but does not mean the pixels were rasterized in main memory.
+    void didPaint(const IntRect& paintedRect);
+    // Records that an invalid tile was culled and did not need to be painted/uploaded, and did not contribute to other tiles needing to be painted.
+    void didCullTileForUpload();
+    // Records pixels that were uploaded to texture memory.
+    void didUpload(const WebKit::WebTransformationMatrix& transformToTarget, const IntRect& uploadRect, const IntRect& opaqueRect);
+    // Record contents texture(s) behind present using the given number of bytes.
+    void didUseContentsTextureMemoryBytes(size_t contentsTextureUseBytes);
+    // Record RenderSurface texture(s) being present using the given number of bytes.
+    void didUseRenderSurfaceTextureMemoryBytes(size_t renderSurfaceUseBytes);
+
+    // These methods are used for saving metrics during draw.
+
+    // Record pixels that were not drawn to screen.
+    void didCullForDrawing(const WebKit::WebTransformationMatrix& transformToTarget, const IntRect& beforeCullRect, const IntRect& afterCullRect);
+    // Record pixels that were drawn to screen.
+    void didDraw(const WebKit::WebTransformationMatrix& transformToTarget, const IntRect& afterCullRect, const IntRect& opaqueRect);
+
+    void recordMetrics(const CCLayerTreeHost*) const;
+    void recordMetrics(const CCLayerTreeHostImpl*) const;
+
+    // Accessors for tests.
+    float pixelsDrawnOpaque() const { return m_pixelsDrawnOpaque; }
+    float pixelsDrawnTranslucent() const { return m_pixelsDrawnTranslucent; }
+    float pixelsCulledForDrawing() const { return m_pixelsCulledForDrawing; }
+    float pixelsPainted() const { return m_pixelsPainted; }
+    float pixelsUploadedOpaque() const { return m_pixelsUploadedOpaque; }
+    float pixelsUploadedTranslucent() const { return m_pixelsUploadedTranslucent; }
+    int tilesCulledForUpload() const { return m_tilesCulledForUpload; }
+
+private:
+    enum MetricsType {
+        UpdateAndCommit,
+        DrawingToScreen
+    };
+
+    explicit CCOverdrawMetrics(bool recordMetricsForFrame);
+
+    template<typename LayerTreeHostType>
+    void recordMetricsInternal(MetricsType, const LayerTreeHostType*) const;
+
+    // When false this class is a giant no-op.
+    bool m_recordMetricsForFrame;
+
+    // These values are used for saving metrics during update/commit.
+
+    // Count of pixels that were painted due to invalidation.
+    float m_pixelsPainted;
+    // Count of pixels uploaded to textures and known to be opaque.
+    float m_pixelsUploadedOpaque;
+    // Count of pixels uploaded to textures and not known to be opaque.
+    float m_pixelsUploadedTranslucent;
+    // Count of tiles that were invalidated but not uploaded.
+    int m_tilesCulledForUpload;
+    // Count the number of bytes in contents textures.
+    unsigned long long m_contentsTextureUseBytes;
+    // Count the number of bytes in RenderSurface textures.
+    unsigned long long m_renderSurfaceTextureUseBytes;
+
+    // These values are used for saving metrics during draw.
+
+    // Count of pixels that are opaque (and thus occlude). Ideally this is no more than wiewport width x height.
+    float m_pixelsDrawnOpaque;
+    // Count of pixels that are possibly translucent, and cannot occlude.
+    float m_pixelsDrawnTranslucent;
+    // Count of pixels not drawn as they are occluded by somthing opaque.
+    float m_pixelsCulledForDrawing;
+};
+
+} // namespace cc
+
+#endif