| /* |
| * Copyright (C) 2009, 2010 Apple Inc. All rights reserved. |
| * Copyright (C) 2014 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_LAYER_ASSIGNER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_LAYER_ASSIGNER_H_ |
| |
| #include "third_party/blink/renderer/core/paint/compositing/paint_layer_compositor.h" |
| #include "third_party/blink/renderer/platform/geometry/int_rect.h" |
| #include "third_party/blink/renderer/platform/geometry/layout_point.h" |
| #include "third_party/blink/renderer/platform/graphics/squashing_disallowed_reasons.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| |
| namespace blink { |
| |
| class CompositedLayerMapping; |
| class PaintLayer; |
| |
| class CompositingLayerAssigner { |
| STACK_ALLOCATED(); |
| |
| public: |
| explicit CompositingLayerAssigner(PaintLayerCompositor*); |
| |
| void Assign(PaintLayer* update_root, |
| Vector<PaintLayer*>& layers_needing_paint_invalidation); |
| |
| bool LayersChanged() const { return layers_changed_; } |
| |
| // FIXME: This function should be private. We should remove the one caller |
| // once we've fixed the compositing chicken/egg issues. |
| CompositingStateTransitionType ComputeCompositedLayerUpdate(PaintLayer*); |
| |
| private: |
| struct SquashingState { |
| void UpdateSquashingStateForNewMapping( |
| CompositedLayerMapping*, |
| Vector<PaintLayer*>& layers_needing_paint_invalidation); |
| |
| // The most recent composited backing that the layer should squash onto if |
| // needed. |
| CompositedLayerMapping* most_recent_mapping = nullptr; |
| |
| // Whether all Layers in the stacking subtree rooted at the most recent |
| // mapping's owning layer have had CompositedLayerMappings assigned. Layers |
| // cannot squash into a CompositedLayerMapping owned by a stacking ancestor, |
| // since this changes paint order. |
| bool have_assigned_backings_to_entire_squashing_layer_subtree = false; |
| |
| // This is set to true when most_recent_mapping supports composited |
| // scrolling, and reset to false whenever any layer is not squashed into |
| // scrolling contents, to ensure all layers squashed into scrolling contents |
| // are continuous with the scroller in stacking order, without any other |
| // layer interlacing among them. |
| bool next_layer_may_squash_into_scrolling_contents = false; |
| |
| // Counter that tracks what index the next Layer would be if it gets |
| // squashed to the current non scrolling squashing layer. |
| wtf_size_t next_non_scrolling_squashed_layer_index = 0; |
| // Same as above but for layers squashed into scrolling contents layer. |
| wtf_size_t next_squashed_layer_in_scrolling_contents_index = 0; |
| |
| // The absolute bounding rect of all the squashed layers (not including |
| // those squashed into scrolling contents). |
| IntRect bounding_rect; |
| |
| // This is simply the sum of the areas of the squashed rects. This can be |
| // very skewed if the rects overlap, but should be close enough to drive a |
| // heuristic (not including those squashed into scrolling contents). |
| uint64_t total_area_of_squashed_rects = 0; |
| }; |
| |
| void AssignLayersToBackingsInternal( |
| PaintLayer* layer, |
| PaintLayer* paint_invalidation_container, |
| SquashingState&, |
| Vector<PaintLayer*>& layers_needing_paint_invalidation); |
| SquashingDisallowedReasons GetReasonsPreventingSquashing( |
| const PaintLayer*, |
| const SquashingState&); |
| bool SquashingWouldExceedSparsityTolerance(const PaintLayer* candidate, |
| const SquashingState&); |
| void UpdateSquashingAssignment( |
| PaintLayer*, |
| SquashingState&, |
| CompositingStateTransitionType, |
| Vector<PaintLayer*>& layers_needing_paint_invalidation); |
| bool NeedsOwnBacking(const PaintLayer*) const; |
| |
| PaintLayerCompositor* compositor_; |
| bool layers_changed_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_LAYER_ASSIGNER_H_ |