cc: Consolidate the analysis_canvas operations

cc/picture.cc

 // 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.
 
 #include "base/debug/trace_event.h"
 #include "cc/content_layer_client.h"
 #include "cc/picture.h"
 #include "cc/rendering_stats.h"
 #include "skia/ext/analysis_canvas.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 96 matching lines @@
   DCHECK(picture_);
 
   canvas->save();
   canvas->clipRect(gfx::RectToSkRect(content_rect));
   canvas->scale(contents_scale, contents_scale);
   canvas->translate(layer_rect_.x(), layer_rect_.y());
   canvas->drawPicture(*picture_);
   canvas->restore();
 }
 
-bool Picture::IsCheapInRect(const gfx::Rect& layer_rect) const {
-  TRACE_EVENT0("cc", "Picture::IsCheapInRect");
+void Picture::AnalyzeInRect(skia::AnalysisCanvas* canvas,
+                            const gfx::Rect& content_rect,
+                            float contents_scale,
+                            bool* is_solid,
+                            SkColor* solid_color,
+                            bool* is_transparent,
+                            bool* is_cheap) {
+  // Verify outputs are valid.
+  DCHECK(is_solid && solid_color && is_transparent && is_cheap);
 
-  SkBitmap emptyBitmap;
-  emptyBitmap.setConfig(SkBitmap::kNo_Config, layer_rect.width(),
-                        layer_rect.height());
-  skia::AnalysisDevice device(emptyBitmap);
-  skia::AnalysisCanvas canvas(&device);
+  canvas->save();
+  canvas->clipRect(gfx::RectToSkRect(content_rect));
+  canvas->scale(contents_scale, contents_scale);
+  canvas->translate(layer_rect_.x(), layer_rect_.y());
+  canvas->drawPicture(*picture_);
+  canvas->restore();
 
-  canvas.drawPicture(*picture_);
-  return canvas.isCheap();
+  *is_solid = canvas->getColorIfSolid(solid_color);
+  *is_transparent = canvas->isTransparent();
+  *is_cheap = canvas->isCheap();
 }
 
 void Picture::GatherPixelRefs(const gfx::Rect& layer_rect,
                               std::list<skia::LazyPixelRef*>& pixel_ref_list) {
   DCHECK(picture_);
   SkData* pixel_refs = SkPictureUtils::GatherPixelRefs(
       picture_.get(), SkRect::MakeXYWH(layer_rect.x(),
                                        layer_rect.y(),
                                        layer_rect.width(),
                                        layer_rect.height()));
@@ skipping 11 matching lines @@
     if (*refs && (*refs)->getURI() && !strncmp(
         (*refs)->getURI(), labelLazyDecoded, 4)) {
       pixel_ref_list.push_back(static_cast<skia::LazyPixelRef*>(*refs));
     }
     refs++;
   }
   pixel_refs->unref();
 }
 
 }  // namespace cc