Tiled rendering microbenchmarks

content/renderer/all_rendering_benchmarks.cc

Index: content/renderer/all_rendering_benchmarks.cc
diff --git a/content/renderer/all_rendering_benchmarks.cc b/content/renderer/all_rendering_benchmarks.cc
index 6039329c4d10942e5d621e1e756fb8300c4cb51b..efd799da2dc2124860b8e21dfaae5a23c05d9c0a 100644
--- a/content/renderer/all_rendering_benchmarks.cc
+++ b/content/renderer/all_rendering_benchmarks.cc
@@ -4,18 +4,21 @@
 
 #include "content/renderer/all_rendering_benchmarks.h"
 
+#include <algorithm>
 #include <string>
+#include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "content/renderer/rendering_benchmark.h"
 #include "content/renderer/rendering_benchmark_results.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/core/SkDevice.h"
+#include "skia/ext/platform_canvas.h"
+#include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/utils/SkNullCanvas.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebCanvas.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebRect.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebSize.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewBenchmarkSupport.h"
 
@@ -24,9 +27,13 @@ using base::TimeTicks;
 using WebKit::WebSize;
 using WebKit::WebCanvas;
 using WebKit::WebViewBenchmarkSupport;
+using WebKit::WebRect;
+using std::vector;
 
 namespace {
 
+// This is a base class for timing the painting of the current webpage to
+// custom WebCanvases.
 class CustomPaintBenchmark
     : public content::RenderingBenchmark,
       public WebViewBenchmarkSupport::PaintClient {
@@ -38,17 +45,17 @@ class CustomPaintBenchmark
 
   virtual WebCanvas* willPaint(const WebSize& size) OVERRIDE {
     WebCanvas* canvas = createCanvas(size);
-    before_time_ = TimeTicks::Now();
+    before_time_ = TimeTicks::HighResNow();
     return canvas;
   }
 
   virtual void didPaint(WebCanvas* canvas) OVERRIDE {
-    paint_time_total_ += (TimeTicks::Now() - before_time_);
+    paint_time_total_ += (TimeTicks::HighResNow() - before_time_);
     delete canvas;
   }
 
   virtual void Run(content::RenderingBenchmarkResults* results,
-                   WebViewBenchmarkSupport* support) {
+                   WebViewBenchmarkSupport* support) OVERRIDE {
     paint_time_total_ = TimeDelta();
     support->paint(this, paint_mode_);
     results->AddResult(name(),
@@ -73,13 +80,7 @@ class BitmapCanvasPaintBenchmark : public CustomPaintBenchmark {
 
  private:
   virtual WebCanvas* createCanvas(const WebSize& size) OVERRIDE {
-    SkDevice* device = new SkDevice(SkBitmap::kARGB_8888_Config,
-                                    size.width,
-                                    size.height,
-                                    false);
-    WebCanvas* canvas = new WebCanvas(device);
-    device->unref();
-    return canvas;
+    return skia::CreateBitmapCanvas(size.width, size.height, false);
   }
 };
 
@@ -87,13 +88,150 @@ class NullCanvasPaintBenchmark : public CustomPaintBenchmark {
  public:
   NullCanvasPaintBenchmark(const std::string& name,
                            WebViewBenchmarkSupport::PaintMode paint_mode)
-      : CustomPaintBenchmark(name, paint_mode) { }
+      : CustomPaintBenchmark(name, paint_mode),
+        canvas_count_(0) { }
+
+  virtual void Run(content::RenderingBenchmarkResults* results,
+                   WebViewBenchmarkSupport* support) OVERRIDE {
+    canvas_count_ = 0;
+    CustomPaintBenchmark::Run(results, support);
+    results->AddResult(name(),
+                       "canvasCount",
+                       "i",
+                       canvas_count_);
+  }
 
  private:
   virtual WebCanvas* createCanvas(const WebSize& size) OVERRIDE {
+    ++canvas_count_;
     return SkCreateNullCanvas();
   }
+
+  int canvas_count_;
+};
+
+class SkPicturePaintBenchmark : public CustomPaintBenchmark {
+ public:
+  SkPicturePaintBenchmark(const std::string& name,
+                          WebViewBenchmarkSupport::PaintMode paint_mode)
+      : CustomPaintBenchmark(name, paint_mode) { }
+
+  virtual void didPaint(WebCanvas* canvas) OVERRIDE {
+    DCHECK(picture_.getRecordingCanvas() == canvas);
+    picture_.endRecording();
+    CustomPaintBenchmark::didPaint(NULL);
+  }
+
+ private:
+  virtual WebCanvas* createCanvas(const WebSize& size) OVERRIDE {
+    return picture_.beginRecording(size.width, size.height);
+  }
+
+  SkPicture picture_;
+};
+
+// Base class for timing the replaying of the SkPicture into canvases.
+class TiledReplayBenchmark
+    : public content::RenderingBenchmark,
+      public WebViewBenchmarkSupport::PaintClient {
+ public:
+  TiledReplayBenchmark(const std::string& name,
+                       WebViewBenchmarkSupport::PaintMode paint_mode)
+      : RenderingBenchmark(name),
+        paint_mode_(paint_mode) {}
+
+  virtual WebCanvas* willPaint(const WebSize& size) OVERRIDE {
+    return picture_.beginRecording(size.width, size.height);
+  }
+
+  virtual void didPaint(WebCanvas* canvas) OVERRIDE {
+    DCHECK(picture_.getRecordingCanvas() == canvas);
+    picture_.endRecording();
+
+    const vector<WebRect> repaint_tiles = GetRepaintTiles(
+        WebSize(picture_.width(), picture_.height()));
+
+    vector<WebRect>::const_iterator it;
+    for (it = repaint_tiles.begin(); it != repaint_tiles.end(); ++it) {
+      WebRect tile = *it;
+      scoped_ptr<WebCanvas> canvas(
+          skia::CreateBitmapCanvas(tile.width, tile.height, false));
+      TimeTicks before_time = TimeTicks::HighResNow();
+      canvas->translate(-tile.x, -tile.y);
+      picture_.draw(canvas.get());
+      paint_time_total_ += (TimeTicks::HighResNow() - before_time);
+    }
+  }
+
+  virtual void Run(content::RenderingBenchmarkResults* results,
+                   WebViewBenchmarkSupport* support) {
+    paint_time_total_ = TimeDelta();
+    support->paint(this, paint_mode_);
+    results->AddResult(name(),
+                       "repaintTime",
+                       "s",
+                       paint_time_total_.InSecondsF());
+  }
+
+ private:
+  virtual vector<WebRect> GetRepaintTiles(const WebSize& layer_size) const = 0;
+
+  TimeDelta paint_time_total_;
+  SkPicture picture_;
+  const WebViewBenchmarkSupport::PaintMode paint_mode_;
 };
+
+class SquareTiledReplayBenchmark : public TiledReplayBenchmark {
+ public:
+  SquareTiledReplayBenchmark(const std::string& name,
+                             WebViewBenchmarkSupport::PaintMode paint_mode,
+                             int tile_size)
+      : TiledReplayBenchmark(name, paint_mode),
+        tile_size_(tile_size) {
+    CHECK_GT(tile_size, 0);
+  }
+
+ private:
+  virtual vector<WebRect> GetRepaintTiles(
+      const WebSize& layer_size) const OVERRIDE {
+    vector<WebRect> tiles;
+    for (int x = 0; x < layer_size.width; x += tile_size_) {
+      for (int y = 0; y < layer_size.height; y += tile_size_) {
+        int width = std::min(layer_size.width - x, tile_size_);
+        int height = std::min(layer_size.height - y, tile_size_);
+        tiles.push_back(WebRect(x, y, width, height));
+      }
+    }
+    return tiles;
+  }
+
+  int tile_size_;
+};
+
+class LayerWidthTiledReplayBenchmark : public TiledReplayBenchmark {
+ public:
+  LayerWidthTiledReplayBenchmark(const std::string& name,
+                                 WebViewBenchmarkSupport::PaintMode paint_mode,
+                                 int tile_height)
+      : TiledReplayBenchmark(name, paint_mode),
+        tile_height_(tile_height) {
+    CHECK_GT(tile_height, 0);
+  }
+
+ private:
+  virtual vector<WebRect> GetRepaintTiles(
+      const WebSize& layer_size) const OVERRIDE {
+    vector<WebRect> tiles;
+    for (int y = 0; y < layer_size.height; y += tile_height_) {
+      int height = std::min(layer_size.height - y, tile_height_);
+      tiles.push_back(WebRect(0, y, layer_size.width, height));
+    }
+    return tiles;
+  }
+
+  int tile_height_;
+};
+
 }  // anonymous namespace
 
 namespace content {
@@ -106,6 +244,37 @@ ScopedVector<RenderingBenchmark> AllRenderingBenchmarks() {
   benchmarks.push_back(new NullCanvasPaintBenchmark(
       "PaintEverythingToNullCanvas",
       WebViewBenchmarkSupport::PaintModeEverything));
+  benchmarks.push_back(new SkPicturePaintBenchmark(
+      "PaintEverythingToSkPicture",
+      WebViewBenchmarkSupport::PaintModeEverything));
+  benchmarks.push_back(new SquareTiledReplayBenchmark(
+      "RepaintEverythingTo256x256Bitmap",
+      WebViewBenchmarkSupport::PaintModeEverything,
+      256));
+  benchmarks.push_back(new SquareTiledReplayBenchmark(
+      "RepaintEverythingTo128x128Bitmap",
+      WebViewBenchmarkSupport::PaintModeEverything,
+      128));
+  benchmarks.push_back(new SquareTiledReplayBenchmark(
+      "RepaintEverythingTo512x512Bitmap",
+      WebViewBenchmarkSupport::PaintModeEverything,
+      512));
+  benchmarks.push_back(new LayerWidthTiledReplayBenchmark(
+      "RepaintEverythingToLayerWidthx256Bitmap",
+      WebViewBenchmarkSupport::PaintModeEverything,
+      256));
+  benchmarks.push_back(new LayerWidthTiledReplayBenchmark(
+      "RepaintEverythingToLayerWidthx128Bitmap",
+      WebViewBenchmarkSupport::PaintModeEverything,
+      128));
+  benchmarks.push_back(new LayerWidthTiledReplayBenchmark(
+      "RepaintEverythingToLayerWidthx64Bitmap",
+      WebViewBenchmarkSupport::PaintModeEverything,
+      64));
+  benchmarks.push_back(new LayerWidthTiledReplayBenchmark(
+      "RepaintEverythingToLayerWidthx512Bitmap",
+      WebViewBenchmarkSupport::PaintModeEverything,
+      512));
   return benchmarks.Pass();
 }