Revert 234641 "cc: Combine analysis and raster"

This breaks rasterization.  Reverting to investigate.

> cc: Combine analysis and raster
>
> This changes the analysis of PicturePiles from optimistic (hoping to
> save raster work by checking if a rastered bitmap would be a solid
> color) to pessimistic (assuming most bitmaps are not solid colors and
> just checking afterwards). It does this by rastering to both an
> AnalysisCanvas and a normal SkCanvas via SkNWayCanvas and then
> checking the results afterwards.
>
> R=reveman@chromium.org, senorblanco@chromium.org
> BUG=310796
>
> Review URL: https://codereview.chromium.org/63443003

TBR=enne@chromium.org, senorblanco@chromium.org
BUG=318782

Review URL: https://codereview.chromium.org/62103012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234962 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 98 insertions, 50 deletions

diff --git a/cc/resources/picture.cc b/cc/resources/picture.cc
index 1b4c43c..7e278f8 100644
--- a/cc/resources/picture.cc
+++ b/cc/resources/picture.cc
@@ -296,6 +296,7 @@ void Picture::GatherPixelRefs(
 
 int Picture::Raster(
     SkCanvas* canvas,
+    SkDrawPictureCallback* callback,
     const Region& negated_content_region,
     float contents_scale) {
   TRACE_EVENT_BEGIN1(
@@ -313,7 +314,7 @@ int Picture::Raster(
 
   canvas->scale(contents_scale, contents_scale);
   canvas->translate(layer_rect_.x(), layer_rect_.y());
-  picture_->draw(canvas);
+  picture_->draw(canvas, callback);
   SkIRect bounds;
   canvas->getClipDeviceBounds(&bounds);
   canvas->restore();
diff --git a/cc/resources/picture.h b/cc/resources/picture.h
index b2e5b29..4eb238a 100644
--- a/cc/resources/picture.h
+++ b/cc/resources/picture.h
@@ -71,6 +71,7 @@ class CC_EXPORT Picture
   // Apply this scale and raster the negated region into the canvas. See comment
   // in PicturePileImpl::RasterCommon for explanation on negated content region.
   int Raster(SkCanvas* canvas,
+             SkDrawPictureCallback* callback,
              const Region& negated_content_region,
              float contents_scale);
 
diff --git a/cc/resources/picture_pile_impl.cc b/cc/resources/picture_pile_impl.cc
index c540f6c..44a52b8 100644
--- a/cc/resources/picture_pile_impl.cc
+++ b/cc/resources/picture_pile_impl.cc
@@ -74,11 +74,19 @@ void PicturePileImpl::RasterDirect(
     float contents_scale,
     RenderingStatsInstrumentation* rendering_stats_instrumentation) {
   RasterCommon(canvas,
+               NULL,
                canvas_rect,
                contents_scale,
                rendering_stats_instrumentation);
 }
 
+void PicturePileImpl::RasterForAnalysis(
+    skia::AnalysisCanvas* canvas,
+    gfx::Rect canvas_rect,
+    float contents_scale) {
+  RasterCommon(canvas, canvas, canvas_rect, contents_scale, NULL);
+}
+
 void PicturePileImpl::RasterToBitmap(
     SkCanvas* canvas,
     gfx::Rect canvas_rect,
@@ -127,6 +135,7 @@ void PicturePileImpl::RasterToBitmap(
   }
 
   RasterCommon(canvas,
+               NULL,
                canvas_rect,
                contents_scale,
                rendering_stats_instrumentation);
@@ -192,6 +201,7 @@ void PicturePileImpl::CoalesceRasters(gfx::Rect canvas_rect,
 
 void PicturePileImpl::RasterCommon(
     SkCanvas* canvas,
+    SkDrawPictureCallback* callback,
     gfx::Rect canvas_rect,
     float contents_scale,
     RenderingStatsInstrumentation* rendering_stats_instrumentation) {
@@ -240,7 +250,7 @@ void PicturePileImpl::RasterCommon(
         start_time = rendering_stats_instrumentation->StartRecording();
 
       rasterized_pixel_count = picture->Raster(
-          canvas, negated_clip_region, contents_scale);
+          canvas, callback, negated_clip_region, contents_scale);
 
       if (rendering_stats_instrumentation) {
         base::TimeDelta duration =
@@ -287,6 +297,30 @@ skia::RefPtr<SkPicture> PicturePileImpl::GetFlattenedPicture() {
   return picture;
 }
 
+void PicturePileImpl::AnalyzeInRect(gfx::Rect content_rect,
+                                    float contents_scale,
+                                    PicturePileImpl::Analysis* analysis) {
+  DCHECK(analysis);
+  TRACE_EVENT0("cc", "PicturePileImpl::AnalyzeInRect");
+
+  gfx::Rect layer_rect = gfx::ScaleToEnclosingRect(
+      content_rect, 1.0f / contents_scale);
+
+  layer_rect.Intersect(gfx::Rect(tiling_.total_size()));
+
+  SkBitmap empty_bitmap;
+  empty_bitmap.setConfig(SkBitmap::kNo_Config,
+                         layer_rect.width(),
+                         layer_rect.height());
+  skia::AnalysisDevice device(empty_bitmap);
+  skia::AnalysisCanvas canvas(&device);
+
+  RasterForAnalysis(&canvas, layer_rect, 1.0f);
+
+  analysis->is_solid_color = canvas.GetColorIfSolid(&analysis->solid_color);
+  analysis->has_text = canvas.HasText();
+}
+
 PicturePileImpl::Analysis::Analysis()
     : is_solid_color(false),
       has_text(false) {
@@ -342,19 +376,6 @@ void PicturePileImpl::PixelRefIterator::AdvanceToTilePictureWithPixelRefs() {
   }
 }
 
-gfx::Rect PicturePileImpl::AnalysisRectForRaster(gfx::Rect content_rect,
-                                                 float contents_scale) const {
-  // Bound the analysis rect to just the pile content.
-  gfx::Rect content_bounds(
-      gfx::ScaleToEnclosingRect(gfx::Rect(size()), contents_scale));
-  gfx::Rect analysis_rect(content_rect);
-  analysis_rect.Intersect(content_bounds);
-  // Move to canvas space.
-  analysis_rect.set_origin(gfx::Point());
-
-  return analysis_rect;
-}
-
 void PicturePileImpl::DidBeginTracing() {
   gfx::Rect layer_rect(tiling_.total_size());
   std::set<void*> processed_pictures;
diff --git a/cc/resources/picture_pile_impl.h b/cc/resources/picture_pile_impl.h
index b99e996..66b5f72 100644
--- a/cc/resources/picture_pile_impl.h
+++ b/cc/resources/picture_pile_impl.h
@@ -52,6 +52,14 @@ class CC_EXPORT PicturePileImpl : public PicturePileBase {
       float contents_scale,
       RenderingStatsInstrumentation* stats_instrumentation);
 
+  // Called when analyzing a tile. We can use AnalysisCanvas as
+  // SkDrawPictureCallback, which allows us to early out from analysis.
+  void RasterForAnalysis(
+      skia::AnalysisCanvas* canvas,
+      gfx::Rect canvas_rect,
+      float contents_scale);
+
+
   skia::RefPtr<SkPicture> GetFlattenedPicture();
 
   struct CC_EXPORT Analysis {
@@ -63,6 +71,10 @@ class CC_EXPORT PicturePileImpl : public PicturePileBase {
     SkColor solid_color;
   };
 
+  void AnalyzeInRect(gfx::Rect content_rect,
+                     float contents_scale,
+                     Analysis* analysis);
+
   class CC_EXPORT PixelRefIterator {
    public:
     PixelRefIterator(gfx::Rect content_rect,
@@ -85,9 +97,6 @@ class CC_EXPORT PicturePileImpl : public PicturePileBase {
     std::set<const void*> processed_pictures_;
   };
 
-  gfx::Rect AnalysisRectForRaster(gfx::Rect content_rect,
-                                  float contents_scale) const;
-
   void DidBeginTracing();
 
  protected:
@@ -122,6 +131,7 @@ class CC_EXPORT PicturePileImpl : public PicturePileBase {
 
   void RasterCommon(
       SkCanvas* canvas,
+      SkDrawPictureCallback* callback,
       gfx::Rect canvas_rect,
       float contents_scale,
       RenderingStatsInstrumentation* rendering_stats_instrumentation);
diff --git a/cc/resources/raster_worker_pool.cc b/cc/resources/raster_worker_pool.cc
index 671271c..67c548f 100644
--- a/cc/resources/raster_worker_pool.cc
+++ b/cc/resources/raster_worker_pool.cc
@@ -13,8 +13,6 @@
 #include "skia/ext/lazy_pixel_ref.h"
 #include "skia/ext/paint_simplifier.h"
 #include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/utils/SkNWayCanvas.h"
-#include "ui/gfx/skia_util.h"
 
 namespace cc {
 
@@ -33,6 +31,10 @@ class IdentityAllocator : public SkBitmap::Allocator {
   void* buffer_;
 };
 
+// Flag to indicate whether we should try and detect that
+// a tile is of solid color.
+const bool kUseColorEstimator = true;
+
 class DisableLCDTextFilter : public SkDrawFilter {
  public:
   // SkDrawFilter interface.
@@ -71,11 +73,34 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
         rendering_stats_(rendering_stats),
         reply_(reply) {}
 
-  // Overridden from internal::RasterWorkerPoolTask:
-  virtual bool RunOnWorkerThread(unsigned thread_index,
-                                 void* buffer,
-                                 gfx::Size size,
-                                 int stride) OVERRIDE {
+  void RunAnalysisOnThread(unsigned thread_index) {
+    TRACE_EVENT1("cc",
+                 "RasterWorkerPoolTaskImpl::RunAnalysisOnThread",
+                 "data",
+                 TracedValue::FromValue(DataAsValue().release()));
+
+    DCHECK(picture_pile_.get());
+    DCHECK(rendering_stats_);
+
+    PicturePileImpl* picture_clone =
+        picture_pile_->GetCloneForDrawingOnThread(thread_index);
+
+    DCHECK(picture_clone);
+
+    picture_clone->AnalyzeInRect(content_rect_, contents_scale_, &analysis_);
+
+    // Record the solid color prediction.
+    UMA_HISTOGRAM_BOOLEAN("Renderer4.SolidColorTilesAnalyzed",
+                          analysis_.is_solid_color);
+
+    // Clear the flag if we're not using the estimator.
+    analysis_.is_solid_color &= kUseColorEstimator;
+  }
+
+  bool RunRasterOnThread(unsigned thread_index,
+                         void* buffer,
+                         gfx::Size size,
+                         int stride) {
     TRACE_EVENT2(
         "cc", "RasterWorkerPoolTaskImpl::RunRasterOnThread",
         "data",
@@ -89,6 +114,9 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
     DCHECK(picture_pile_.get());
     DCHECK(buffer);
 
+    if (analysis_.is_solid_color)
+      return false;
+
     PicturePileImpl* picture_clone =
         picture_pile_->GetCloneForDrawingOnThread(thread_index);
 
@@ -117,22 +145,8 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
         break;
     }
 
-    SkBitmap empty_bitmap;
-    empty_bitmap.setConfig(
-        SkBitmap::kNo_Config, content_rect_.width(), content_rect_.height());
-    gfx::Rect analysis_rect(
-        picture_clone->AnalysisRectForRaster(content_rect_, contents_scale_));
-    skia::AnalysisDevice analysis_device(empty_bitmap,
-                                         gfx::RectToSkRect(analysis_rect));
-    skia::AnalysisCanvas analysis_canvas(&analysis_device);
-
-    SkBitmapDevice raster_device(bitmap);
-    SkCanvas raster_canvas(&raster_device);
-
-    SkNWayCanvas canvas(content_rect_.width(), content_rect_.height());
-    canvas.addCanvas(&analysis_canvas);
-    canvas.addCanvas(&raster_canvas);
-
+    SkBitmapDevice device(bitmap);
+    SkCanvas canvas(&device);
     skia::RefPtr<SkDrawFilter> draw_filter;
     switch (raster_mode_) {
       case LOW_QUALITY_RASTER_MODE:
@@ -178,17 +192,18 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
 
     ChangeBitmapConfigIfNeeded(bitmap, buffer);
 
-    analysis_.is_solid_color =
-        analysis_canvas.GetColorIfSolid(&analysis_.solid_color);
-    analysis_.has_text = analysis_canvas.HasText();
-
-    // Record the solid color prediction.
-    UMA_HISTOGRAM_BOOLEAN("Renderer4.SolidColorTilesAnalyzed",
-                          analysis_.is_solid_color);
-
-    return !analysis_.is_solid_color;
+    return true;
   }
 
+  // Overridden from internal::RasterWorkerPoolTask:
+  virtual bool RunOnWorkerThread(unsigned thread_index,
+                                 void* buffer,
+                                 gfx::Size size,
+                                 int stride)
+      OVERRIDE {
+    RunAnalysisOnThread(thread_index);
+    return RunRasterOnThread(thread_index, buffer, size, stride);
+  }
   virtual void CompleteOnOriginThread() OVERRIDE {
     reply_.Run(analysis_, !HasFinishedRunning() || WasCanceled());
   }