Part 8 of cc/ directory shuffles: resources

cc/picture_pile.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 <algorithm>
-
-#include "cc/base/region.h"
-#include "cc/picture_pile.h"
-#include "cc/picture_pile_impl.h"
-
-namespace {
-// Maximum number of pictures that can overlap before we collapse them into
-// a larger one.
-const int kMaxOverlapping = 2;
-// Maximum percentage area of the base picture another picture in the picture
-// list can be.  If higher, we destroy the list and recreate from scratch.
-const float kResetThreshold = 0.7f;
-// Layout pixel buffer around the visible layer rect to record.  Any base
-// picture that intersects the visible layer rect expanded by this distance
-// will be recorded.
-const int kPixelDistanceToRecord = 8000;
-}
-
-namespace cc {
-
-PicturePile::PicturePile() {
-}
-
-PicturePile::~PicturePile() {
-}
-
-void PicturePile::Update(
-    ContentLayerClient* painter,
-    SkColor background_color,
-    const Region& invalidation,
-    gfx::Rect visible_layer_rect,
-    RenderingStats* stats) {
-  background_color_ = background_color;
-
-  gfx::Rect interest_rect = visible_layer_rect;
-  interest_rect.Inset(
-      -kPixelDistanceToRecord,
-      -kPixelDistanceToRecord,
-      -kPixelDistanceToRecord,
-      -kPixelDistanceToRecord);
-  for (Region::Iterator i(invalidation); i.has_rect(); i.next()) {
-    // Inflate all recordings from invalidations with a margin so that when
-    // scaled down to at least min_contents_scale, any final pixel touched by an
-    // invalidation can be fully rasterized by this picture.
-    gfx::Rect inflated_invalidation = i.rect();
-    inflated_invalidation.Inset(
-        -buffer_pixels(),
-        -buffer_pixels(),
-        -buffer_pixels(),
-        -buffer_pixels());
-    // Split this inflated invalidation across tile boundaries and apply it
-    // to all tiles that it touches.
-    for (TilingData::Iterator iter(&tiling_, inflated_invalidation);
-         iter; ++iter) {
-      gfx::Rect tile =
-          tiling_.TileBoundsWithBorder(iter.index_x(), iter.index_y());
-      if (!tile.Intersects(interest_rect)) {
-        // This invalidation touches a tile outside the interest rect, so
-        // just remove the entire picture list.
-        picture_list_map_.erase(iter.index());
-        continue;
-      }
-
-      gfx::Rect tile_invalidation =
-          gfx::IntersectRects(inflated_invalidation, tile);
-      if (tile_invalidation.IsEmpty())
-        continue;
-      PictureListMap::iterator find = picture_list_map_.find(iter.index());
-      if (find == picture_list_map_.end())
-        continue;
-      PictureList& pic_list = find->second;
-      // Leave empty pic_lists empty in case there are multiple invalidations.
-      if (!pic_list.empty())
-        InvalidateRect(pic_list, tile_invalidation);
-    }
-  }
-
-  // Walk through all pictures in the rect of interest and record.
-  for (TilingData::Iterator iter(&tiling_, interest_rect); iter; ++iter) {
-    // Create a picture in this list if it doesn't exist.
-    PictureList& pic_list = picture_list_map_[iter.index()];
-    if (pic_list.empty()) {
-      // Inflate the base picture with a margin, similar to invalidations, so
-      // that when scaled down to at least min_contents_scale, the enclosed
-      // rect still includes content all the way to the edge of the layer.
-      gfx::Rect tile = tiling_.TileBounds(iter.index_x(), iter.index_y());
-      tile.Inset(
-        -buffer_pixels(),
-        -buffer_pixels(),
-        -buffer_pixels(),
-        -buffer_pixels());
-      scoped_refptr<Picture> base_picture = Picture::Create(tile);
-      pic_list.push_back(base_picture);
-    }
-
-    for (PictureList::iterator pic = pic_list.begin();
-         pic != pic_list.end(); ++pic) {
-      if (!(*pic)->HasRecording()) {
-        (*pic)->Record(painter, stats, tile_grid_info_);
-        (*pic)->CloneForDrawing(num_raster_threads_);
-      }
-    }
-  }
-
-  UpdateRecordedRegion();
-}
-
-class FullyContainedPredicate {
- public:
-  FullyContainedPredicate(gfx::Rect rect) : layer_rect_(rect) {}
-  bool operator()(const scoped_refptr<Picture>& picture) {
-    return layer_rect_.Contains(picture->LayerRect());
-  }
-  gfx::Rect layer_rect_;
-};
-
-void PicturePile::InvalidateRect(
-    PictureList& picture_list,
-    gfx::Rect invalidation) {
-  DCHECK(!picture_list.empty());
-
-  std::vector<PictureList::iterator> overlaps;
-  for (PictureList::iterator i = picture_list.begin();
-       i != picture_list.end(); ++i) {
-    if ((*i)->LayerRect().Contains(invalidation) && !(*i)->HasRecording())
-      return;
-    if ((*i)->LayerRect().Intersects(invalidation) && i != picture_list.begin())
-      overlaps.push_back(i);
-  }
-
-  gfx::Rect picture_rect = invalidation;
-  if (overlaps.size() >= kMaxOverlapping) {
-    for (size_t j = 0; j < overlaps.size(); j++)
-      picture_rect.Union((*overlaps[j])->LayerRect());
-  }
-
-  Picture* base_picture = picture_list.front();
-  int max_pixels = kResetThreshold * base_picture->LayerRect().size().GetArea();
-  if (picture_rect.size().GetArea() > max_pixels) {
-    // This picture list will be entirely recreated, so clear it.
-    picture_list.clear();
-    return;
-  }
-
-  FullyContainedPredicate pred(picture_rect);
-  picture_list.erase(std::remove_if(picture_list.begin(),
-                                    picture_list.end(),
-                                    pred),
-                     picture_list.end());
-  picture_list.push_back(Picture::Create(picture_rect));
-}
-
-}  // namespace cc