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chromium / chromium / src / 47f5d9434eb58a7bc0862c2e92c7a6cd6d708c36 / . / cc / trees / property_tree_builder.cc
blob: a8765e687e8759e81cbb7c4aee74bd34e2c8e212 [file] [log] [blame]
// Copyright 2014 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 "cc/trees/property_tree_builder.h"
#include <stddef.h>
#include <map>
#include <set>
#include "cc/base/math_util.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_impl.h"
#include "cc/layers/picture_layer.h"
#include "cc/trees/clip_node.h"
#include "cc/trees/draw_property_utils.h"
#include "cc/trees/effect_node.h"
#include "cc/trees/layer_tree_impl.h"
#include "cc/trees/layer_tree_settings.h"
#include "cc/trees/mutator_host.h"
#include "cc/trees/scroll_node.h"
#include "cc/trees/transform_node.h"
#include "components/viz/common/frame_sinks/copy_output_request.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/vector2d_conversions.h"
namespace cc {
namespace {
template <typename LayerType>
struct DataForRecursion {
int transform_tree_parent;
int transform_tree_parent_fixed;
int clip_tree_parent;
int effect_tree_parent;
int scroll_tree_parent;
int closest_ancestor_with_cached_render_surface;
int closest_ancestor_with_copy_request;
uint32_t main_thread_scrolling_reasons;
SkColor safe_opaque_background_color;
bool in_subtree_of_page_scale_layer;
bool affected_by_outer_viewport_bounds_delta;
bool should_flatten;
bool scroll_tree_parent_created_by_uninheritable_criteria;
bool animation_axis_aligned_since_render_target;
bool not_axis_aligned_since_last_clip;
gfx::Transform compound_transform_since_render_target;
};
template <typename LayerType>
class PropertyTreeBuilderContext {
public:
PropertyTreeBuilderContext(LayerType* root_layer,
const LayerType* page_scale_layer,
const LayerType* inner_viewport_scroll_layer,
const LayerType* outer_viewport_scroll_layer,
const ElementId overscroll_elasticity_element_id,
const gfx::Vector2dF& elastic_overscroll,
float page_scale_factor,
const gfx::Transform& device_transform,
MutatorHost* mutator_host,
PropertyTrees* property_trees)
: root_layer_(root_layer),
page_scale_layer_(page_scale_layer),
inner_viewport_scroll_layer_(inner_viewport_scroll_layer),
outer_viewport_scroll_layer_(outer_viewport_scroll_layer),
overscroll_elasticity_element_id_(overscroll_elasticity_element_id),
elastic_overscroll_(elastic_overscroll),
page_scale_factor_(page_scale_factor),
device_transform_(device_transform),
mutator_host_(*mutator_host),
property_trees_(*property_trees),
transform_tree_(property_trees->transform_tree),
clip_tree_(property_trees->clip_tree),
effect_tree_(property_trees->effect_tree),
scroll_tree_(property_trees->scroll_tree) {
InitializeScrollChildrenMap();
}
void InitializeScrollChildrenMap();
void BuildPropertyTrees(float device_scale_factor,
const gfx::Rect& viewport,
SkColor root_background_color) const;
private:
void BuildPropertyTreesInternal(
LayerType* layer,
const DataForRecursion<LayerType>& data_from_parent) const;
bool AddTransformNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
bool created_render_surface,
DataForRecursion<LayerType>* data_for_children) const;
void AddClipNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
bool created_transform_node,
DataForRecursion<LayerType>* data_for_children) const;
bool AddEffectNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
DataForRecursion<LayerType>* data_for_children) const;
void AddScrollNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
DataForRecursion<LayerType>* data_for_children) const;
LayerType* root_layer_;
const LayerType* page_scale_layer_;
const LayerType* inner_viewport_scroll_layer_;
const LayerType* outer_viewport_scroll_layer_;
const ElementId overscroll_elasticity_element_id_;
const gfx::Vector2dF elastic_overscroll_;
float page_scale_factor_;
const gfx::Transform& device_transform_;
MutatorHost& mutator_host_;
PropertyTrees& property_trees_;
TransformTree& transform_tree_;
ClipTree& clip_tree_;
EffectTree& effect_tree_;
ScrollTree& scroll_tree_;
std::multimap<const LayerType*, LayerType*> scroll_children_map_;
};
static LayerPositionConstraint PositionConstraint(Layer* layer) {
return layer->position_constraint();
}
static LayerPositionConstraint PositionConstraint(LayerImpl* layer) {
return layer->test_properties()->position_constraint;
}
static LayerStickyPositionConstraint StickyPositionConstraint(Layer* layer) {
return layer->sticky_position_constraint();
}
static LayerStickyPositionConstraint StickyPositionConstraint(
LayerImpl* layer) {
return layer->test_properties()->sticky_position_constraint;
}
static LayerImplList& LayerChildren(LayerImpl* layer) {
return layer->test_properties()->children;
}
static const LayerList& LayerChildren(Layer* layer) {
return layer->children();
}
static LayerImpl* LayerChildAt(LayerImpl* layer, int index) {
return layer->test_properties()->children[index];
}
static Layer* LayerChildAt(Layer* layer, int index) {
return layer->children()[index].get();
}
static Layer* ScrollParent(Layer* layer) {
return layer->scroll_parent();
}
static LayerImpl* ScrollParent(LayerImpl* layer) {
return layer->test_properties()->scroll_parent;
}
static Layer* ClipParent(Layer* layer) {
return layer->clip_parent();
}
static LayerImpl* ClipParent(LayerImpl* layer) {
return layer->test_properties()->clip_parent;
}
static inline const FilterOperations& Filters(Layer* layer) {
return layer->filters();
}
static inline const FilterOperations& Filters(LayerImpl* layer) {
return layer->test_properties()->filters;
}
static PictureLayer* MaskLayer(Layer* layer) {
return layer->mask_layer();
}
static LayerImpl* MaskLayer(LayerImpl* layer) {
return layer->test_properties()->mask_layer;
}
static const gfx::Transform& Transform(Layer* layer) {
return layer->transform();
}
static const gfx::Transform& Transform(LayerImpl* layer) {
return layer->test_properties()->transform;
}
static const gfx::PointF& Position(Layer* layer) {
return layer->position();
}
static const gfx::PointF& Position(LayerImpl* layer) {
return layer->test_properties()->position;
}
// Methods to query state from the AnimationHost ----------------------
template <typename LayerType>
bool OpacityIsAnimating(const MutatorHost& host, LayerType* layer) {
return host.IsAnimatingOpacityProperty(layer->element_id(),
layer->GetElementTypeForAnimation());
}
template <typename LayerType>
bool HasPotentiallyRunningOpacityAnimation(const MutatorHost& host,
LayerType* layer) {
return host.HasPotentiallyRunningOpacityAnimation(
layer->element_id(), layer->GetElementTypeForAnimation());
}
template <typename LayerType>
bool FilterIsAnimating(const MutatorHost& host, LayerType* layer) {
return host.IsAnimatingFilterProperty(layer->element_id(),
layer->GetElementTypeForAnimation());
}
template <typename LayerType>
bool HasPotentiallyRunningFilterAnimation(const MutatorHost& host,
LayerType* layer) {
return host.HasPotentiallyRunningFilterAnimation(
layer->element_id(), layer->GetElementTypeForAnimation());
}
template <typename LayerType>
bool TransformIsAnimating(const MutatorHost& host, LayerType* layer) {
return host.IsAnimatingTransformProperty(layer->element_id(),
layer->GetElementTypeForAnimation());
}
template <typename LayerType>
bool HasPotentiallyRunningTransformAnimation(const MutatorHost& host,
LayerType* layer) {
return host.HasPotentiallyRunningTransformAnimation(
layer->element_id(), layer->GetElementTypeForAnimation());
}
template <typename LayerType>
bool HasOnlyTranslationTransforms(const MutatorHost& host, LayerType* layer) {
return host.HasOnlyTranslationTransforms(layer->element_id(),
layer->GetElementTypeForAnimation());
}
template <typename LayerType>
bool AnimationsPreserveAxisAlignment(const MutatorHost& host,
LayerType* layer) {
return host.AnimationsPreserveAxisAlignment(layer->element_id());
}
template <typename LayerType>
bool HasAnyAnimationTargetingProperty(const MutatorHost& host,
LayerType* layer,
TargetProperty::Type property) {
return host.HasAnyAnimationTargetingProperty(layer->element_id(), property);
}
// -------------------------------------------------------------------
template <typename LayerType>
static int GetTransformParent(const DataForRecursion<LayerType>& data,
LayerType* layer) {
return PositionConstraint(layer).is_fixed_position()
? data.transform_tree_parent_fixed
: data.transform_tree_parent;
}
template <typename LayerType>
static bool LayerClipsSubtree(LayerType* layer) {
return layer->masks_to_bounds() || MaskLayer(layer);
}
template <typename LayerType>
static int GetScrollParentId(const DataForRecursion<LayerType>& data,
LayerType* layer) {
const bool inherits_scroll = !ScrollParent(layer);
const int id = inherits_scroll ? data.scroll_tree_parent
: ScrollParent(layer)->scroll_tree_index();
return id;
}
static Layer* LayerParent(Layer* layer) {
return layer->parent();
}
static LayerImpl* LayerParent(LayerImpl* layer) {
return layer->test_properties()->parent;
}
static inline int SortingContextId(Layer* layer) {
return layer->sorting_context_id();
}
static inline int SortingContextId(LayerImpl* layer) {
return layer->test_properties()->sorting_context_id;
}
static inline bool Is3dSorted(Layer* layer) {
return layer->sorting_context_id() != 0;
}
static inline bool Is3dSorted(LayerImpl* layer) {
return layer->test_properties()->sorting_context_id != 0;
}
static inline bool HasLatestSequenceNumber(const Layer* layer, int number) {
return layer->property_tree_sequence_number() == number;
}
static inline bool HasLatestSequenceNumber(const LayerImpl*, int) {
return true;
}
template <typename LayerType>
void PropertyTreeBuilderContext<LayerType>::AddClipNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
bool created_transform_node,
DataForRecursion<LayerType>* data_for_children) const {
const bool inherits_clip = !ClipParent(layer);
// Sanity check the clip parent already built clip node before us.
DCHECK(inherits_clip ||
HasLatestSequenceNumber(ClipParent(layer),
property_trees_.sequence_number));
const int parent_id = inherits_clip ? data_from_ancestor.clip_tree_parent
: ClipParent(layer)->clip_tree_index();
bool layer_clips_subtree = LayerClipsSubtree(layer);
bool requires_node =
layer_clips_subtree || Filters(layer).HasFilterThatMovesPixels();
if (!requires_node) {
data_for_children->clip_tree_parent = parent_id;
} else {
ClipNode node;
node.clip = gfx::RectF(gfx::PointF() + layer->offset_to_transform_parent(),
gfx::SizeF(layer->bounds()));
node.transform_id = created_transform_node
? data_for_children->transform_tree_parent
: GetTransformParent(data_from_ancestor, layer);
if (layer_clips_subtree) {
node.clip_type = ClipNode::ClipType::APPLIES_LOCAL_CLIP;
} else {
DCHECK(Filters(layer).HasFilterThatMovesPixels());
node.clip_type = ClipNode::ClipType::EXPANDS_CLIP;
node.clip_expander = ClipExpander(layer->effect_tree_index());
}
data_for_children->clip_tree_parent = clip_tree_.Insert(node, parent_id);
}
layer->SetClipTreeIndex(data_for_children->clip_tree_parent);
}
template <typename LayerType>
static inline bool IsAtBoundaryOf3dRenderingContext(LayerType* layer) {
return LayerParent(layer)
? SortingContextId(LayerParent(layer)) != SortingContextId(layer)
: Is3dSorted(layer);
}
static inline gfx::Point3F TransformOrigin(Layer* layer) {
return layer->transform_origin();
}
static inline gfx::Point3F TransformOrigin(LayerImpl* layer) {
return layer->test_properties()->transform_origin;
}
static inline bool IsContainerForFixedPositionLayers(Layer* layer) {
return layer->IsContainerForFixedPositionLayers();
}
static inline bool IsContainerForFixedPositionLayers(LayerImpl* layer) {
return layer->test_properties()->is_container_for_fixed_position_layers;
}
static inline bool ShouldFlattenTransform(Layer* layer) {
return layer->should_flatten_transform();
}
static inline bool ShouldFlattenTransform(LayerImpl* layer) {
return layer->test_properties()->should_flatten_transform;
}
template <typename LayerType>
bool PropertyTreeBuilderContext<LayerType>::AddTransformNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
bool created_render_surface,
DataForRecursion<LayerType>* data_for_children) const {
const bool is_root = !LayerParent(layer);
const bool is_page_scale_layer = layer == page_scale_layer_;
const bool is_overscroll_elasticity_layer =
overscroll_elasticity_element_id_ &&
layer->element_id() == overscroll_elasticity_element_id_;
const bool is_scrollable = layer->scrollable();
const bool is_fixed = PositionConstraint(layer).is_fixed_position();
const bool is_sticky = StickyPositionConstraint(layer).is_sticky;
// Scrolling a layer should not move it from being pixel-aligned to moving off
// the pixel grid and becoming fuzzy. So always snap scrollable things to the
// pixel grid. Layers may also request to be snapped as such.
const bool is_snapped =
is_scrollable || layer->IsSnappedToPixelGridInTarget();
const bool has_significant_transform =
!Transform(layer).IsIdentityOr2DTranslation();
const bool has_potentially_animated_transform =
HasPotentiallyRunningTransformAnimation(mutator_host_, layer);
// A transform node is needed even for a finished animation, since differences
// in the timing of animation state updates can mean that an animation that's
// in the Finished state at tree-building time on the main thread is still in
// the Running state right after commit on the compositor thread.
const bool has_any_transform_animation = HasAnyAnimationTargetingProperty(
mutator_host_, layer, TargetProperty::TRANSFORM);
const bool has_surface = created_render_surface;
const bool is_at_boundary_of_3d_rendering_context =
IsAtBoundaryOf3dRenderingContext(layer);
DCHECK(!is_scrollable || is_snapped);
bool requires_node = is_root || is_snapped || has_significant_transform ||
has_any_transform_animation || has_surface || is_fixed ||
is_page_scale_layer || is_overscroll_elasticity_layer ||
is_sticky || is_at_boundary_of_3d_rendering_context;
int parent_index = TransformTree::kRootNodeId;
int source_index = TransformTree::kRootNodeId;
gfx::Vector2dF source_offset;
if (!is_root) {
parent_index = GetTransformParent(data_from_ancestor, layer);
// Because Blink still provides positions with respect to the parent layer,
// we track both a parent TransformNode (which is the parent in the
// TransformTree) and a 'source' TransformNode (which is the TransformNode
// for the parent in the Layer tree).
source_index = LayerParent(layer)->transform_tree_index();
source_offset = LayerParent(layer)->offset_to_transform_parent();
}
// For a container of fixed position descendants, define for them their
// fixed-position transform parent as being this layer's transform node, or
// its transform parent's node if this layer won't have a node of its own.
//
// But if this layer is scrollable, then we point fixed position descendants
// to not be affected by this layer as it changes its scroll offset during
// a compositor thread scroll. We do this by pointing them to the direct
// parent of this layer, which acts as a proxy for this layer, without
// including scrolling, based on the assumption this layer has no transform
// itself when scrollable.
if (IsContainerForFixedPositionLayers(layer) || is_root) {
data_for_children->affected_by_outer_viewport_bounds_delta =
layer->IsResizedByBrowserControls();
if (is_scrollable) {
DCHECK(Transform(layer).IsIdentity());
if (!is_root) {
data_for_children->transform_tree_parent_fixed =
LayerParent(layer)->transform_tree_index();
}
} else {
data_for_children->transform_tree_parent_fixed =
requires_node ? transform_tree_.next_available_id() : parent_index;
}
}
if (!requires_node) {
data_for_children->should_flatten |= ShouldFlattenTransform(layer);
gfx::Vector2dF local_offset =
Position(layer).OffsetFromOrigin() + Transform(layer).To2dTranslation();
gfx::Vector2dF source_to_parent;
if (source_index != parent_index) {
gfx::Transform to_parent;
transform_tree_.ComputeTranslation(source_index, parent_index,
&to_parent);
source_to_parent = to_parent.To2dTranslation();
}
layer->SetOffsetToTransformParent(source_offset + source_to_parent +
local_offset);
layer->SetShouldFlattenScreenSpaceTransformFromPropertyTree(
data_from_ancestor.should_flatten);
layer->SetTransformTreeIndex(parent_index);
return false;
}
transform_tree_.Insert(TransformNode(), parent_index);
TransformNode* node = transform_tree_.back();
layer->SetTransformTreeIndex(node->id);
data_for_children->transform_tree_parent = node->id;
// For animation subsystem purposes, if this layer has a compositor element
// id, we build a map from that id to this transform node.
if (layer->element_id()) {
property_trees_.element_id_to_transform_node_index[layer->element_id()] =
node->id;
node->element_id = layer->element_id();
}
node->scrolls = is_scrollable;
node->should_be_snapped = is_snapped;
node->flattens_inherited_transform = data_for_children->should_flatten;
node->sorting_context_id = SortingContextId(layer);
if (layer == page_scale_layer_)
data_for_children->in_subtree_of_page_scale_layer = true;
node->in_subtree_of_page_scale_layer =
data_for_children->in_subtree_of_page_scale_layer;
// Surfaces inherently flatten transforms.
data_for_children->should_flatten =
ShouldFlattenTransform(layer) || has_surface;
node->has_potential_animation = has_potentially_animated_transform;
node->is_currently_animating = TransformIsAnimating(mutator_host_, layer);
if (has_potentially_animated_transform) {
node->has_only_translation_animations =
HasOnlyTranslationTransforms(mutator_host_, layer);
}
float post_local_scale_factor = 1.0f;
if (is_page_scale_layer) {
if (!is_root)
post_local_scale_factor *= page_scale_factor_;
transform_tree_.set_page_scale_factor(page_scale_factor_);
}
node->source_node_id = source_index;
node->post_local_scale_factor = post_local_scale_factor;
if (is_root) {
float page_scale_factor_for_root =
is_page_scale_layer ? page_scale_factor_ : 1.f;
// SetRootTransformsAndScales will be incorrect if the root layer has
// non-zero position, so ensure it is zero.
DCHECK(Position(layer).IsOrigin());
transform_tree_.SetRootTransformsAndScales(
transform_tree_.device_scale_factor(), page_scale_factor_for_root,
device_transform_);
} else {
node->source_offset = source_offset;
node->update_post_local_transform(Position(layer), TransformOrigin(layer));
}
if (is_overscroll_elasticity_layer) {
DCHECK(!is_scrollable);
node->scroll_offset = gfx::ScrollOffset(elastic_overscroll_);
} else if (!ScrollParent(layer)) {
node->scroll_offset = layer->CurrentScrollOffset();
}
if (is_fixed) {
if (data_from_ancestor.affected_by_outer_viewport_bounds_delta) {
node->moved_by_outer_viewport_bounds_delta_x =
PositionConstraint(layer).is_fixed_to_right_edge();
node->moved_by_outer_viewport_bounds_delta_y =
PositionConstraint(layer).is_fixed_to_bottom_edge();
if (node->moved_by_outer_viewport_bounds_delta_x ||
node->moved_by_outer_viewport_bounds_delta_y) {
transform_tree_.AddNodeAffectedByOuterViewportBoundsDelta(node->id);
}
}
}
node->local = Transform(layer);
node->update_pre_local_transform(TransformOrigin(layer));
if (StickyPositionConstraint(layer).is_sticky) {
StickyPositionNodeData* sticky_data =
transform_tree_.StickyPositionData(node->id);
sticky_data->constraints = StickyPositionConstraint(layer);
sticky_data->scroll_ancestor = GetScrollParentId(data_from_ancestor, layer);
ScrollNode* scroll_ancestor =
scroll_tree_.Node(sticky_data->scroll_ancestor);
// Position sticky should never attach to the inner viewport since it
// shouldn't be affected by pinch-zoom. If we did then we'd need setting
// the inner viewport bounds delta to cause a TransformTree update, which
// it currently doesn't.
DCHECK(!scroll_ancestor->scrolls_inner_viewport);
if (sticky_data->constraints.is_anchored_right ||
sticky_data->constraints.is_anchored_bottom) {
// Sticky nodes whose ancestor scroller is the inner / outer viewport
// need to have their local transform updated when the inner / outer
// viewport bounds change, but do not unconditionally move by that delta
// like fixed position nodes.
if (scroll_ancestor->scrolls_outer_viewport)
transform_tree_.AddNodeAffectedByOuterViewportBoundsDelta(node->id);
}
// Copy the ancestor nodes for later use. These elements are guaranteed to
// have transform nodes at this point because they are our ancestors (so
// have already been processed) and are sticky (so have transform nodes).
ElementId shifting_sticky_box_element_id =
sticky_data->constraints.nearest_element_shifting_sticky_box;
if (shifting_sticky_box_element_id) {
sticky_data->nearest_node_shifting_sticky_box =
transform_tree_.FindNodeFromElementId(shifting_sticky_box_element_id)
->id;
}
ElementId shifting_containing_block_element_id =
sticky_data->constraints.nearest_element_shifting_containing_block;
if (shifting_containing_block_element_id) {
sticky_data->nearest_node_shifting_containing_block =
transform_tree_
.FindNodeFromElementId(shifting_containing_block_element_id)
->id;
}
}
node->needs_local_transform_update = true;
transform_tree_.UpdateTransforms(node->id);
layer->SetOffsetToTransformParent(gfx::Vector2dF());
// Flattening (if needed) will be handled by |node|.
layer->SetShouldFlattenScreenSpaceTransformFromPropertyTree(false);
return true;
}
static inline bool HasPotentialOpacityAnimation(const MutatorHost& host,
Layer* layer) {
return HasPotentiallyRunningOpacityAnimation(host, layer) ||
layer->OpacityCanAnimateOnImplThread();
}
static inline bool HasPotentialOpacityAnimation(const MutatorHost& host,
LayerImpl* layer) {
return HasPotentiallyRunningOpacityAnimation(host, layer) ||
layer->test_properties()->opacity_can_animate;
}
static inline bool DoubleSided(Layer* layer) {
return layer->double_sided();
}
static inline bool DoubleSided(LayerImpl* layer) {
return layer->test_properties()->double_sided;
}
static inline bool TrilinearFiltering(Layer* layer) {
return layer->trilinear_filtering();
}
static inline bool TrilinearFiltering(LayerImpl* layer) {
return layer->test_properties()->trilinear_filtering;
}
static inline bool CacheRenderSurface(Layer* layer) {
return layer->cache_render_surface();
}
static inline bool CacheRenderSurface(LayerImpl* layer) {
return layer->test_properties()->cache_render_surface;
}
static inline bool ForceRenderSurface(Layer* layer) {
return layer->force_render_surface_for_testing();
}
static inline bool ForceRenderSurface(LayerImpl* layer) {
return layer->test_properties()->force_render_surface;
}
template <typename LayerType>
static inline bool LayerIsInExisting3DRenderingContext(LayerType* layer) {
return Is3dSorted(layer) && LayerParent(layer) &&
Is3dSorted(LayerParent(layer)) &&
(SortingContextId(LayerParent(layer)) == SortingContextId(layer));
}
static inline bool IsRootForIsolatedGroup(Layer* layer) {
return layer->is_root_for_isolated_group();
}
static inline bool IsRootForIsolatedGroup(LayerImpl* layer) {
return false;
}
static inline int NumDescendantsThatDrawContent(Layer* layer) {
return layer->NumDescendantsThatDrawContent();
}
static inline int NumLayerOrDescendantsThatDrawContentRecursive(
LayerImpl* layer) {
int num = layer->DrawsContent() ? 1 : 0;
for (size_t i = 0; i < layer->test_properties()->children.size(); ++i) {
LayerImpl* child_layer = layer->test_properties()->children[i];
num += NumLayerOrDescendantsThatDrawContentRecursive(child_layer);
}
return num;
}
static inline int NumDescendantsThatDrawContent(LayerImpl* layer) {
int num_descendants_that_draw_content = 0;
for (size_t i = 0; i < layer->test_properties()->children.size(); ++i) {
LayerImpl* child_layer = layer->test_properties()->children[i];
num_descendants_that_draw_content +=
NumLayerOrDescendantsThatDrawContentRecursive(child_layer);
}
return num_descendants_that_draw_content;
}
static inline float EffectiveOpacity(Layer* layer) {
return layer->EffectiveOpacity();
}
static inline float EffectiveOpacity(LayerImpl* layer) {
return layer->test_properties()->hide_layer_and_subtree
? 0.f
: layer->test_properties()->opacity;
}
static inline float Opacity(Layer* layer) {
return layer->opacity();
}
static inline float Opacity(LayerImpl* layer) {
return layer->test_properties()->opacity;
}
static inline SkBlendMode BlendMode(Layer* layer) {
return layer->blend_mode();
}
static inline SkBlendMode BlendMode(LayerImpl* layer) {
return layer->test_properties()->blend_mode;
}
static inline const gfx::PointF FiltersOrigin(Layer* layer) {
return layer->filters_origin();
}
static inline const gfx::PointF FiltersOrigin(LayerImpl* layer) {
return layer->test_properties()->filters_origin;
}
static inline const FilterOperations& BackdropFilters(Layer* layer) {
return layer->backdrop_filters();
}
static inline const FilterOperations& BackdropFilters(LayerImpl* layer) {
return layer->test_properties()->backdrop_filters;
}
static inline const gfx::RectF& BackdropFilterBounds(Layer* layer) {
return layer->backdrop_filter_bounds();
}
static inline const gfx::RectF& BackdropFilterBounds(LayerImpl* layer) {
return layer->test_properties()->backdrop_filter_bounds;
}
static inline float BackdropFilterQuality(Layer* layer) {
return layer->backdrop_filter_quality();
}
static inline float BackdropFilterQuality(LayerImpl* layer) {
return layer->test_properties()->backdrop_filter_quality;
}
static inline bool HideLayerAndSubtree(Layer* layer) {
return layer->hide_layer_and_subtree();
}
static inline bool HideLayerAndSubtree(LayerImpl* layer) {
return layer->test_properties()->hide_layer_and_subtree;
}
static inline bool HasCopyRequest(Layer* layer) {
return layer->HasCopyRequest();
}
static inline bool HasCopyRequest(LayerImpl* layer) {
return !layer->test_properties()->copy_requests.empty();
}
static inline bool PropertyChanged(Layer* layer) {
return layer->subtree_property_changed();
}
static inline bool PropertyChanged(LayerImpl* layer) {
return false;
}
template <typename LayerType>
bool ShouldCreateRenderSurface(const MutatorHost& mutator_host,
LayerType* layer,
gfx::Transform current_transform,
bool animation_axis_aligned) {
const bool preserves_2d_axis_alignment =
current_transform.Preserves2dAxisAlignment() && animation_axis_aligned;
const bool is_root = !LayerParent(layer);
if (is_root)
return true;
// If the layer uses a mask.
if (MaskLayer(layer)) {
return true;
}
// If the layer uses trilinear filtering.
if (TrilinearFiltering(layer)) {
return true;
}
// If the layer uses a CSS filter.
if (!Filters(layer).IsEmpty() || !BackdropFilters(layer).IsEmpty()) {
return true;
}
// If the layer will use a CSS filter. In this case, the animation
// will start and add a filter to this layer, so it needs a surface.
if (HasPotentiallyRunningFilterAnimation(mutator_host, layer)) {
return true;
}
int num_descendants_that_draw_content = NumDescendantsThatDrawContent(layer);
// If the layer flattens its subtree, but it is treated as a 3D object by its
// parent (i.e. parent participates in a 3D rendering context).
if (LayerIsInExisting3DRenderingContext(layer) &&
ShouldFlattenTransform(layer) && num_descendants_that_draw_content > 0) {
TRACE_EVENT_INSTANT0(
"cc", "PropertyTreeBuilder::ShouldCreateRenderSurface flattening",
TRACE_EVENT_SCOPE_THREAD);
return true;
}
// If the layer has blending.
// TODO(rosca): this is temporary, until blending is implemented for other
// types of quads than viz::RenderPassDrawQuad. Layers having descendants that
// draw content will still create a separate rendering surface.
if (BlendMode(layer) != SkBlendMode::kSrcOver) {
TRACE_EVENT_INSTANT0(
"cc", "PropertyTreeBuilder::ShouldCreateRenderSurface blending",
TRACE_EVENT_SCOPE_THREAD);
return true;
}
// If the layer clips its descendants but it is not axis-aligned with respect
// to its parent.
bool layer_clips_external_content = LayerClipsSubtree(layer);
if (layer_clips_external_content && !preserves_2d_axis_alignment &&
num_descendants_that_draw_content > 0) {
TRACE_EVENT_INSTANT0(
"cc", "PropertyTreeBuilder::ShouldCreateRenderSurface clipping",
TRACE_EVENT_SCOPE_THREAD);
return true;
}
// If the layer has some translucency and does not have a preserves-3d
// transform style. This condition only needs a render surface if two or more
// layers in the subtree overlap. But checking layer overlaps is unnecessarily
// costly so instead we conservatively create a surface whenever at least two
// layers draw content for this subtree.
bool at_least_two_layers_in_subtree_draw_content =
num_descendants_that_draw_content > 0 &&
(layer->DrawsContent() || num_descendants_that_draw_content > 1);
bool may_have_transparency =
EffectiveOpacity(layer) != 1.f ||
HasPotentiallyRunningOpacityAnimation(mutator_host, layer);
if (may_have_transparency && ShouldFlattenTransform(layer) &&
at_least_two_layers_in_subtree_draw_content) {
TRACE_EVENT_INSTANT0(
"cc", "PropertyTreeBuilder::ShouldCreateRenderSurface opacity",
TRACE_EVENT_SCOPE_THREAD);
DCHECK(!is_root);
return true;
}
// If the layer has isolation.
// TODO(rosca): to be optimized - create separate rendering surface only when
// the blending descendants might have access to the content behind this layer
// (layer has transparent background or descendants overflow).
// https://code.google.com/p/chromium/issues/detail?id=301738
if (IsRootForIsolatedGroup(layer)) {
TRACE_EVENT_INSTANT0(
"cc", "PropertyTreeBuilder::ShouldCreateRenderSurface isolation",
TRACE_EVENT_SCOPE_THREAD);
return true;
}
// If we force it.
if (ForceRenderSurface(layer))
return true;
// If we cache it.
if (CacheRenderSurface(layer))
return true;
// If we'll make a copy of the layer's contents.
if (HasCopyRequest(layer))
return true;
return false;
}
static void TakeCopyRequests(
Layer* layer,
std::vector<std::unique_ptr<viz::CopyOutputRequest>>* copy_requests) {
layer->TakeCopyRequests(copy_requests);
}
static void TakeCopyRequests(
LayerImpl* layer,
std::vector<std::unique_ptr<viz::CopyOutputRequest>>* copy_requests) {
for (auto& request : layer->test_properties()->copy_requests)
copy_requests->push_back(std::move(request));
layer->test_properties()->copy_requests.clear();
}
static void SetSubtreeHasCopyRequest(Layer* layer,
bool subtree_has_copy_request) {
layer->SetSubtreeHasCopyRequest(subtree_has_copy_request);
}
static void SetSubtreeHasCopyRequest(LayerImpl* layer,
bool subtree_has_copy_request) {
layer->test_properties()->subtree_has_copy_request = subtree_has_copy_request;
}
static bool SubtreeHasCopyRequest(Layer* layer) {
return layer->SubtreeHasCopyRequest();
}
static bool SubtreeHasCopyRequest(LayerImpl* layer) {
return layer->test_properties()->subtree_has_copy_request;
}
template <typename LayerType>
bool UpdateSubtreeHasCopyRequestRecursive(LayerType* layer) {
bool subtree_has_copy_request = false;
if (HasCopyRequest(layer))
subtree_has_copy_request = true;
for (size_t i = 0; i < LayerChildren(layer).size(); ++i) {
LayerType* current_child = LayerChildAt(layer, i);
subtree_has_copy_request |=
UpdateSubtreeHasCopyRequestRecursive(current_child);
}
SetSubtreeHasCopyRequest(layer, subtree_has_copy_request);
return subtree_has_copy_request;
}
template <typename LayerType>
bool PropertyTreeBuilderContext<LayerType>::AddEffectNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
DataForRecursion<LayerType>* data_for_children) const {
const bool is_root = !LayerParent(layer);
const bool has_transparency = EffectiveOpacity(layer) != 1.f;
const bool has_potential_opacity_animation =
HasPotentialOpacityAnimation(mutator_host_, layer);
const bool has_potential_filter_animation =
HasPotentiallyRunningFilterAnimation(mutator_host_, layer);
data_for_children->animation_axis_aligned_since_render_target &=
AnimationsPreserveAxisAlignment(mutator_host_, layer);
data_for_children->compound_transform_since_render_target *= Transform(layer);
const bool should_create_render_surface = ShouldCreateRenderSurface(
mutator_host_, layer,
data_for_children->compound_transform_since_render_target,
data_for_children->animation_axis_aligned_since_render_target);
bool not_axis_aligned_since_last_clip =
data_from_ancestor.not_axis_aligned_since_last_clip
? true
: !AnimationsPreserveAxisAlignment(mutator_host_, layer) ||
!Transform(layer).Preserves2dAxisAlignment();
// A non-axis aligned clip may need a render surface. So, we create an effect
// node.
bool has_non_axis_aligned_clip =
not_axis_aligned_since_last_clip && LayerClipsSubtree(layer);
bool requires_node =
is_root || has_transparency || has_potential_opacity_animation ||
has_potential_filter_animation || has_non_axis_aligned_clip ||
should_create_render_surface;
int parent_id = data_from_ancestor.effect_tree_parent;
if (!requires_node) {
layer->SetEffectTreeIndex(parent_id);
data_for_children->effect_tree_parent = parent_id;
return false;
}
int node_id = effect_tree_.Insert(EffectNode(), parent_id);
EffectNode* node = effect_tree_.back();
node->stable_id = layer->id();
node->opacity = Opacity(layer);
node->blend_mode = BlendMode(layer);
node->unscaled_mask_target_size = layer->bounds();
node->has_render_surface = should_create_render_surface;
node->cache_render_surface = CacheRenderSurface(layer);
node->has_copy_request = HasCopyRequest(layer);
node->filters = Filters(layer);
node->backdrop_filters = BackdropFilters(layer);
node->backdrop_filter_bounds = BackdropFilterBounds(layer);
node->backdrop_filter_quality = BackdropFilterQuality(layer);
node->filters_origin = FiltersOrigin(layer);
node->trilinear_filtering = TrilinearFiltering(layer);
node->has_potential_opacity_animation = has_potential_opacity_animation;
node->has_potential_filter_animation = has_potential_filter_animation;
node->double_sided = DoubleSided(layer);
node->subtree_hidden = HideLayerAndSubtree(layer);
node->is_currently_animating_opacity =
OpacityIsAnimating(mutator_host_, layer);
node->is_currently_animating_filter = FilterIsAnimating(mutator_host_, layer);
node->effect_changed = PropertyChanged(layer);
node->subtree_has_copy_request = SubtreeHasCopyRequest(layer);
node->closest_ancestor_with_cached_render_surface_id =
CacheRenderSurface(layer)
? node_id
: data_from_ancestor.closest_ancestor_with_cached_render_surface;
node->closest_ancestor_with_copy_request_id =
HasCopyRequest(layer)
? node_id
: data_from_ancestor.closest_ancestor_with_copy_request;
if (MaskLayer(layer)) {
node->mask_layer_id = MaskLayer(layer)->id();
effect_tree_.AddMaskLayerId(node->mask_layer_id);
}
if (!is_root) {
// The effect node's transform id is used only when we create a render
// surface. So, we can leave the default value when we don't create a render
// surface.
if (should_create_render_surface) {
// In this case, we will create a transform node, so it's safe to use the
// next available id from the transform tree as this effect node's
// transform id.
node->transform_id = transform_tree_.next_available_id();
}
node->clip_id = data_from_ancestor.clip_tree_parent;
} else {
// The root render surface acts as the unbounded and untransformed
// surface into which content is drawn. The transform node created
// from the root layer (which includes device scale factor) and
// the clip node created from the root layer (which includes
// viewports) apply to the root render surface's content, but not
// to the root render surface itself.
node->transform_id = TransformTree::kRootNodeId;
node->clip_id = ClipTree::kViewportNodeId;
}
data_for_children->closest_ancestor_with_cached_render_surface =
node->closest_ancestor_with_cached_render_surface_id;
data_for_children->closest_ancestor_with_copy_request =
node->closest_ancestor_with_copy_request_id;
data_for_children->effect_tree_parent = node_id;
layer->SetEffectTreeIndex(node_id);
// For animation subsystem purposes, if this layer has a compositor element
// id, we build a map from that id to this effect node.
if (layer->element_id()) {
property_trees_.element_id_to_effect_node_index[layer->element_id()] =
node_id;
}
std::vector<std::unique_ptr<viz::CopyOutputRequest>> layer_copy_requests;
TakeCopyRequests(layer, &layer_copy_requests);
for (auto& it : layer_copy_requests) {
effect_tree_.AddCopyRequest(node_id, std::move(it));
}
layer_copy_requests.clear();
if (should_create_render_surface) {
data_for_children->compound_transform_since_render_target =
gfx::Transform();
data_for_children->animation_axis_aligned_since_render_target = true;
}
return should_create_render_surface;
}
static inline bool UserScrollableHorizontal(Layer* layer) {
return layer->GetUserScrollableHorizontal();
}
static inline bool UserScrollableHorizontal(LayerImpl* layer) {
return layer->test_properties()->user_scrollable_horizontal;
}
static inline bool UserScrollableVertical(Layer* layer) {
return layer->GetUserScrollableVertical();
}
static inline bool UserScrollableVertical(LayerImpl* layer) {
return layer->test_properties()->user_scrollable_vertical;
}
static inline OverscrollBehavior GetOverscrollBehavior(Layer* layer) {
return layer->overscroll_behavior();
}
static inline OverscrollBehavior GetOverscrollBehavior(LayerImpl* layer) {
return layer->test_properties()->overscroll_behavior;
}
static inline const base::Optional<SnapContainerData>& GetSnapContainerData(
Layer* layer) {
return layer->snap_container_data();
}
static inline const base::Optional<SnapContainerData>& GetSnapContainerData(
LayerImpl* layer) {
return layer->test_properties()->snap_container_data;
}
static inline uint32_t MainThreadScrollingReasons(Layer* layer) {
return layer->GetMainThreadScrollingReasons();
}
static inline uint32_t MainThreadScrollingReasons(LayerImpl* layer) {
return layer->test_properties()->main_thread_scrolling_reasons;
}
template <typename LayerType>
void SetHasTransformNode(LayerType* layer, bool val) {
layer->SetHasTransformNode(val);
}
template <typename LayerType>
void PropertyTreeBuilderContext<LayerType>::AddScrollNodeIfNeeded(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
DataForRecursion<LayerType>* data_for_children) const {
int parent_id = GetScrollParentId(data_from_ancestor, layer);
bool is_root = !LayerParent(layer);
bool scrollable = layer->scrollable();
bool contains_non_fast_scrollable_region =
!layer->non_fast_scrollable_region().IsEmpty();
uint32_t main_thread_scrolling_reasons = MainThreadScrollingReasons(layer);
bool scroll_node_uninheritable_criteria =
is_root || scrollable || contains_non_fast_scrollable_region;
bool has_different_main_thread_scrolling_reasons =
main_thread_scrolling_reasons !=
data_from_ancestor.main_thread_scrolling_reasons;
bool requires_node =
scroll_node_uninheritable_criteria ||
(main_thread_scrolling_reasons !=
MainThreadScrollingReason::kNotScrollingOnMain &&
(has_different_main_thread_scrolling_reasons ||
data_from_ancestor
.scroll_tree_parent_created_by_uninheritable_criteria));
int node_id;
if (!requires_node) {
node_id = parent_id;
data_for_children->scroll_tree_parent = node_id;
} else {
ScrollNode node;
node.scrollable = scrollable;
node.main_thread_scrolling_reasons = main_thread_scrolling_reasons;
node.scrolls_inner_viewport = layer == inner_viewport_scroll_layer_;
node.scrolls_outer_viewport = layer == outer_viewport_scroll_layer_;
if (node.scrolls_inner_viewport &&
data_from_ancestor.in_subtree_of_page_scale_layer) {
node.max_scroll_offset_affected_by_page_scale = true;
}
node.bounds = layer->bounds();
node.container_bounds = layer->scroll_container_bounds();
node.offset_to_transform_parent = layer->offset_to_transform_parent();
node.should_flatten =
layer->should_flatten_screen_space_transform_from_property_tree();
node.user_scrollable_horizontal = UserScrollableHorizontal(layer);
node.user_scrollable_vertical = UserScrollableVertical(layer);
node.element_id = layer->element_id();
node.transform_id = data_for_children->transform_tree_parent;
node.overscroll_behavior = GetOverscrollBehavior(layer);
node.snap_container_data = GetSnapContainerData(layer);
node_id = scroll_tree_.Insert(node, parent_id);
data_for_children->scroll_tree_parent = node_id;
data_for_children->main_thread_scrolling_reasons =
node.main_thread_scrolling_reasons;
data_for_children->scroll_tree_parent_created_by_uninheritable_criteria =
scroll_node_uninheritable_criteria;
// For animation subsystem purposes, if this layer has a compositor element
// id, we build a map from that id to this scroll node.
if (layer->element_id()) {
property_trees_.element_id_to_scroll_node_index[layer->element_id()] =
node_id;
}
if (node.scrollable) {
scroll_tree_.SetBaseScrollOffset(layer->element_id(),
layer->CurrentScrollOffset());
}
}
layer->SetScrollTreeIndex(node_id);
}
template <typename LayerType>
void SetBackfaceVisibilityTransform(LayerType* layer,
bool created_transform_node) {
if (layer->use_parent_backface_visibility()) {
DCHECK(LayerParent(layer));
DCHECK(!LayerParent(layer)->use_parent_backface_visibility());
layer->SetShouldCheckBackfaceVisibility(
LayerParent(layer)->should_check_backface_visibility());
} else {
// A double-sided layer's backface can been shown when its visible.
// In addition, we need to check if (1) there might be a local 3D transform
// on the layer that might turn it to the backface, or (2) it is not drawn
// into a flattened space.
layer->SetShouldCheckBackfaceVisibility(
!DoubleSided(layer) && (created_transform_node ||
!ShouldFlattenTransform(LayerParent(layer))));
}
}
template <typename LayerType>
void SetSafeOpaqueBackgroundColor(
const DataForRecursion<LayerType>& data_from_ancestor,
LayerType* layer,
DataForRecursion<LayerType>* data_for_children) {
SkColor background_color = layer->background_color();
data_for_children->safe_opaque_background_color =
SkColorGetA(background_color) == 255
? background_color
: data_from_ancestor.safe_opaque_background_color;
layer->SetSafeOpaqueBackgroundColor(
data_for_children->safe_opaque_background_color);
}
static void SetLayerPropertyChangedForChild(Layer* parent, Layer* child) {
if (parent->subtree_property_changed())
child->SetSubtreePropertyChanged();
}
static void SetLayerPropertyChangedForChild(LayerImpl* parent,
LayerImpl* child) {}
template <typename LayerType>
void PropertyTreeBuilderContext<LayerType>::BuildPropertyTreesInternal(
LayerType* layer,
const DataForRecursion<LayerType>& data_from_parent) const {
layer->set_property_tree_sequence_number(property_trees_.sequence_number);
DataForRecursion<LayerType> data_for_children(data_from_parent);
bool created_render_surface =
AddEffectNodeIfNeeded(data_from_parent, layer, &data_for_children);
bool created_transform_node = AddTransformNodeIfNeeded(
data_from_parent, layer, created_render_surface, &data_for_children);
SetHasTransformNode(layer, created_transform_node);
AddClipNodeIfNeeded(data_from_parent, layer, created_transform_node,
&data_for_children);
AddScrollNodeIfNeeded(data_from_parent, layer, &data_for_children);
SetBackfaceVisibilityTransform(layer, created_transform_node);
SetSafeOpaqueBackgroundColor(data_from_parent, layer, &data_for_children);
bool not_axis_aligned_since_last_clip =
data_from_parent.not_axis_aligned_since_last_clip
? true
: !AnimationsPreserveAxisAlignment(mutator_host_, layer) ||
!Transform(layer).Preserves2dAxisAlignment();
bool has_non_axis_aligned_clip =
not_axis_aligned_since_last_clip && LayerClipsSubtree(layer);
data_for_children.not_axis_aligned_since_last_clip =
!has_non_axis_aligned_clip;
for (size_t i = 0; i < LayerChildren(layer).size(); ++i) {
LayerType* current_child = LayerChildAt(layer, i);
SetLayerPropertyChangedForChild(layer, current_child);
if (!ScrollParent(current_child)) {
BuildPropertyTreesInternal(current_child, data_for_children);
}
}
auto scroll_children_range = scroll_children_map_.equal_range(layer);
for (auto it = scroll_children_range.first;
it != scroll_children_range.second; ++it) {
LayerType* scroll_child = it->second;
DCHECK_EQ(ScrollParent(scroll_child), layer);
DCHECK(LayerParent(scroll_child));
data_for_children.effect_tree_parent =
LayerParent(scroll_child)->effect_tree_index();
BuildPropertyTreesInternal(scroll_child, data_for_children);
}
if (MaskLayer(layer)) {
MaskLayer(layer)->set_property_tree_sequence_number(
property_trees_.sequence_number);
MaskLayer(layer)->SetOffsetToTransformParent(
layer->offset_to_transform_parent());
MaskLayer(layer)->SetTransformTreeIndex(layer->transform_tree_index());
MaskLayer(layer)->SetClipTreeIndex(layer->clip_tree_index());
MaskLayer(layer)->SetEffectTreeIndex(layer->effect_tree_index());
MaskLayer(layer)->SetScrollTreeIndex(layer->scroll_tree_index());
}
}
const LayerTreeHost& AllLayerRange(const Layer* root_layer) {
return *root_layer->layer_tree_host();
}
const LayerTreeImpl& AllLayerRange(const LayerImpl* root_layer) {
return *root_layer->layer_tree_impl();
}
} // namespace
Layer* PropertyTreeBuilder::FindFirstScrollableLayer(Layer* layer) {
if (!layer)
return nullptr;
if (layer->scrollable())
return layer;
for (size_t i = 0; i < layer->children().size(); ++i) {
Layer* found = FindFirstScrollableLayer(layer->children()[i].get());
if (found)
return found;
}
return nullptr;
}
template <typename LayerType>
void PropertyTreeBuilderContext<LayerType>::BuildPropertyTrees(
float device_scale_factor,
const gfx::Rect& viewport,
SkColor root_background_color) const {
if (!property_trees_.needs_rebuild) {
bool page_scale_is_root_layer = page_scale_layer_ == root_layer_;
if (page_scale_layer_) {
DCHECK_GE(page_scale_layer_->transform_tree_index(),
TransformTree::kRootNodeId);
TransformNode* node = property_trees_.transform_tree.Node(
page_scale_layer_->transform_tree_index());
// When the page scale layer is also the root layer, the node should also
// store the combined scale factor and not just the page scale factor.
float device_scale_factor_for_page_scale_node = 1.f;
gfx::Transform device_transform_for_page_scale_node;
if (page_scale_is_root_layer) {
device_transform_for_page_scale_node = device_transform_;
device_scale_factor_for_page_scale_node = device_scale_factor;
}
draw_property_utils::UpdatePageScaleFactor(
&property_trees_, node, page_scale_factor_,
device_scale_factor_for_page_scale_node,
device_transform_for_page_scale_node);
}
draw_property_utils::UpdateElasticOverscroll(
&property_trees_, overscroll_elasticity_element_id_,
elastic_overscroll_);
clip_tree_.SetViewportClip(gfx::RectF(viewport));
float page_scale_factor_for_root =
page_scale_is_root_layer ? page_scale_factor_ : 1.f;
// SetRootTransformsAndScales will be incorrect if the root layer has
// non-zero position, so ensure it is zero.
DCHECK(Position(root_layer_).IsOrigin());
transform_tree_.SetRootTransformsAndScales(
device_scale_factor, page_scale_factor_for_root, device_transform_);
return;
}
DataForRecursion<LayerType> data_for_recursion;
data_for_recursion.transform_tree_parent = TransformTree::kInvalidNodeId;
data_for_recursion.transform_tree_parent_fixed =
TransformTree::kInvalidNodeId;
data_for_recursion.clip_tree_parent = ClipTree::kRootNodeId;
data_for_recursion.effect_tree_parent = EffectTree::kInvalidNodeId;
data_for_recursion.scroll_tree_parent = ScrollTree::kRootNodeId;
data_for_recursion.closest_ancestor_with_cached_render_surface =
EffectTree::kInvalidNodeId;
data_for_recursion.closest_ancestor_with_copy_request =
EffectTree::kInvalidNodeId;
data_for_recursion.in_subtree_of_page_scale_layer = false;
data_for_recursion.affected_by_outer_viewport_bounds_delta = false;
data_for_recursion.should_flatten = false;
data_for_recursion.main_thread_scrolling_reasons =
MainThreadScrollingReason::kNotScrollingOnMain;
data_for_recursion.scroll_tree_parent_created_by_uninheritable_criteria =
true;
data_for_recursion.compound_transform_since_render_target = gfx::Transform();
data_for_recursion.animation_axis_aligned_since_render_target = true;
data_for_recursion.not_axis_aligned_since_last_clip = false;
data_for_recursion.safe_opaque_background_color = root_background_color;
property_trees_.clear();
transform_tree_.set_device_scale_factor(device_scale_factor);
ClipNode root_clip;
root_clip.clip_type = ClipNode::ClipType::APPLIES_LOCAL_CLIP;
root_clip.clip = gfx::RectF(viewport);
root_clip.transform_id = TransformTree::kRootNodeId;
data_for_recursion.clip_tree_parent =
clip_tree_.Insert(root_clip, ClipTree::kRootNodeId);
BuildPropertyTreesInternal(root_layer_, data_for_recursion);
property_trees_.needs_rebuild = false;
// The transform tree is kept up to date as it is built, but the
// combined_clips stored in the clip tree and the screen_space_opacity and
// is_drawn in the effect tree aren't computed during tree building.
transform_tree_.set_needs_update(false);
clip_tree_.set_needs_update(true);
effect_tree_.set_needs_update(true);
scroll_tree_.set_needs_update(false);
}
#if DCHECK_IS_ON()
template <typename LayerType>
static void CheckDanglingScrollParent(LayerType* root_layer) {
std::unordered_set<const LayerType*> layers;
for (const auto* layer : AllLayerRange(root_layer))
layers.insert(layer);
for (auto* layer : AllLayerRange(root_layer))
DCHECK(!ScrollParent(layer) ||
layers.find(ScrollParent(layer)) != layers.end());
}
static void CheckClipPointersForLayer(Layer* layer) {
if (!layer)
return;
if (layer->clip_children()) {
for (auto it = layer->clip_children()->begin();
it != layer->clip_children()->end(); ++it) {
DCHECK_EQ((*it)->clip_parent(), layer);
}
}
}
#endif
template <typename LayerType>
void PropertyTreeBuilderContext<LayerType>::InitializeScrollChildrenMap() {
#if DCHECK_IS_ON()
CheckDanglingScrollParent(root_layer_);
#endif
for (auto* layer : AllLayerRange(root_layer_)) {
if (ScrollParent(layer))
scroll_children_map_.emplace(ScrollParent(layer), layer);
}
}
void PropertyTreeBuilder::BuildPropertyTrees(
Layer* root_layer,
const Layer* page_scale_layer,
const Layer* inner_viewport_scroll_layer,
const Layer* outer_viewport_scroll_layer,
const ElementId overscroll_elasticity_element_id,
const gfx::Vector2dF& elastic_overscroll,
float page_scale_factor,
float device_scale_factor,
const gfx::Rect& viewport,
const gfx::Transform& device_transform,
PropertyTrees* property_trees) {
property_trees->is_main_thread = true;
property_trees->is_active = false;
SkColor color = root_layer->layer_tree_host()->background_color();
if (SkColorGetA(color) != 255)
color = SkColorSetA(color, 255);
if (root_layer->layer_tree_host()->has_copy_request())
UpdateSubtreeHasCopyRequestRecursive(root_layer);
PropertyTreeBuilderContext<Layer>(
root_layer, page_scale_layer, inner_viewport_scroll_layer,
outer_viewport_scroll_layer, overscroll_elasticity_element_id,
elastic_overscroll, page_scale_factor, device_transform,
root_layer->layer_tree_host()->mutator_host(), property_trees)
.BuildPropertyTrees(device_scale_factor, viewport, color);
#if DCHECK_IS_ON()
for (auto* layer : AllLayerRange(root_layer))
CheckClipPointersForLayer(layer);
#endif
property_trees->ResetCachedData();
// During building property trees, all copy requests are moved from layers to
// effect tree, which are then pushed at commit to compositor thread and
// handled there. LayerTreeHost::has_copy_request is only required to
// decide if we want to create a effect node. So, it can be reset now.
root_layer->layer_tree_host()->SetHasCopyRequest(false);
}
void PropertyTreeBuilder::BuildPropertyTrees(
LayerImpl* root_layer,
const LayerImpl* page_scale_layer,
const LayerImpl* inner_viewport_scroll_layer,
const LayerImpl* outer_viewport_scroll_layer,
const ElementId overscroll_elasticity_element_id,
const gfx::Vector2dF& elastic_overscroll,
float page_scale_factor,
float device_scale_factor,
const gfx::Rect& viewport,
const gfx::Transform& device_transform,
PropertyTrees* property_trees) {
// Preserve render surfaces when rebuilding.
std::vector<std::unique_ptr<RenderSurfaceImpl>> render_surfaces;
property_trees->effect_tree.TakeRenderSurfaces(&render_surfaces);
property_trees->is_main_thread = false;
property_trees->is_active = root_layer->IsActive();
SkColor color = root_layer->layer_tree_impl()->background_color();
if (SkColorGetA(color) != 255)
color = SkColorSetA(color, 255);
UpdateSubtreeHasCopyRequestRecursive(root_layer);
PropertyTreeBuilderContext<LayerImpl>(
root_layer, page_scale_layer, inner_viewport_scroll_layer,
outer_viewport_scroll_layer, overscroll_elasticity_element_id,
elastic_overscroll, page_scale_factor, device_transform,
root_layer->layer_tree_impl()->mutator_host(), property_trees)
.BuildPropertyTrees(device_scale_factor, viewport, color);
property_trees->effect_tree.CreateOrReuseRenderSurfaces(
&render_surfaces, root_layer->layer_tree_impl());
property_trees->ResetCachedData();
}
} // namespace cc