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chromium / chromium / src / fb3006176202e29e4c1c007d8123bf0c85f48aba / . / cc / trees / layer_tree_impl.cc
blob: a27630eae962304101996d32155217ad1670dc6b [file] [log] [blame]
// Copyright 2011 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/layer_tree_impl.h"
#include <algorithm>
#include <limits>
#include <set>
#include "base/trace_event/trace_event.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/animation/keyframed_animation_curve.h"
#include "cc/animation/scrollbar_animation_controller.h"
#include "cc/animation/scrollbar_animation_controller_linear_fade.h"
#include "cc/animation/scrollbar_animation_controller_thinning.h"
#include "cc/base/math_util.h"
#include "cc/base/synced_property.h"
#include "cc/base/util.h"
#include "cc/debug/devtools_instrumentation.h"
#include "cc/debug/traced_value.h"
#include "cc/input/page_scale_animation.h"
#include "cc/layers/heads_up_display_layer_impl.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_iterator.h"
#include "cc/layers/render_surface_impl.h"
#include "cc/layers/scrollbar_layer_impl_base.h"
#include "cc/resources/ui_resource_request.h"
#include "cc/trees/layer_tree_host_common.h"
#include "cc/trees/layer_tree_host_impl.h"
#include "cc/trees/occlusion_tracker.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/vector2d_conversions.h"
namespace cc {
// This class exists to split the LayerScrollOffsetDelegate between the
// InnerViewportScrollLayer and the OuterViewportScrollLayer in a manner
// that never requires the embedder or LayerImpl to know about.
class LayerScrollOffsetDelegateProxy : public LayerImpl::ScrollOffsetDelegate {
public:
LayerScrollOffsetDelegateProxy(LayerImpl* layer,
LayerScrollOffsetDelegate* delegate,
LayerTreeImpl* layer_tree)
: layer_(layer), delegate_(delegate), layer_tree_impl_(layer_tree) {}
virtual ~LayerScrollOffsetDelegateProxy() {}
gfx::ScrollOffset last_set_scroll_offset() const {
return last_set_scroll_offset_;
}
// LayerScrollOffsetDelegate implementation.
void SetCurrentScrollOffset(const gfx::ScrollOffset& new_offset) override {
last_set_scroll_offset_ = new_offset;
}
gfx::ScrollOffset GetCurrentScrollOffset() override {
return layer_tree_impl_->GetDelegatedScrollOffset(layer_);
}
bool IsExternalFlingActive() const override {
return delegate_->IsExternalFlingActive();
}
void Update() const override {
layer_tree_impl_->UpdateScrollOffsetDelegate();
}
private:
LayerImpl* layer_;
LayerScrollOffsetDelegate* delegate_;
LayerTreeImpl* layer_tree_impl_;
gfx::ScrollOffset last_set_scroll_offset_;
};
LayerTreeImpl::LayerTreeImpl(
LayerTreeHostImpl* layer_tree_host_impl,
scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
scoped_refptr<SyncedElasticOverscroll> elastic_overscroll)
: layer_tree_host_impl_(layer_tree_host_impl),
source_frame_number_(-1),
hud_layer_(0),
currently_scrolling_layer_(NULL),
root_layer_scroll_offset_delegate_(NULL),
background_color_(0),
has_transparent_background_(false),
overscroll_elasticity_layer_(NULL),
page_scale_layer_(NULL),
inner_viewport_scroll_layer_(NULL),
outer_viewport_scroll_layer_(NULL),
page_scale_factor_(page_scale_factor),
min_page_scale_factor_(0),
max_page_scale_factor_(0),
elastic_overscroll_(elastic_overscroll),
scrolling_layer_id_from_previous_tree_(0),
contents_textures_purged_(false),
viewport_size_invalid_(false),
needs_update_draw_properties_(true),
needs_full_tree_sync_(true),
next_activation_forces_redraw_(false),
has_ever_been_drawn_(false),
render_surface_layer_list_id_(0),
top_controls_shrink_blink_size_(false),
top_controls_height_(0),
top_controls_shown_ratio_(top_controls_shown_ratio) {
}
LayerTreeImpl::~LayerTreeImpl() {
BreakSwapPromises(SwapPromise::SWAP_FAILS);
// Need to explicitly clear the tree prior to destroying this so that
// the LayerTreeImpl pointer is still valid in the LayerImpl dtor.
DCHECK(!root_layer_);
DCHECK(layers_with_copy_output_request_.empty());
}
void LayerTreeImpl::Shutdown() {
root_layer_ = nullptr;
}
void LayerTreeImpl::ReleaseResources() {
if (root_layer_) {
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer_.get(), [](LayerImpl* layer) { layer->ReleaseResources(); });
}
}
void LayerTreeImpl::RecreateResources() {
if (root_layer_) {
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer_.get(),
[](LayerImpl* layer) { layer->RecreateResources(); });
}
}
void LayerTreeImpl::SetRootLayer(scoped_ptr<LayerImpl> layer) {
if (inner_viewport_scroll_layer_)
inner_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
if (outer_viewport_scroll_layer_)
outer_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
inner_viewport_scroll_delegate_proxy_ = nullptr;
outer_viewport_scroll_delegate_proxy_ = nullptr;
root_layer_ = layer.Pass();
currently_scrolling_layer_ = NULL;
inner_viewport_scroll_layer_ = NULL;
outer_viewport_scroll_layer_ = NULL;
page_scale_layer_ = NULL;
layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}
LayerImpl* LayerTreeImpl::InnerViewportScrollLayer() const {
return inner_viewport_scroll_layer_;
}
LayerImpl* LayerTreeImpl::OuterViewportScrollLayer() const {
return outer_viewport_scroll_layer_;
}
gfx::ScrollOffset LayerTreeImpl::TotalScrollOffset() const {
gfx::ScrollOffset offset;
if (inner_viewport_scroll_layer_)
offset += inner_viewport_scroll_layer_->CurrentScrollOffset();
if (outer_viewport_scroll_layer_)
offset += outer_viewport_scroll_layer_->CurrentScrollOffset();
return offset;
}
gfx::ScrollOffset LayerTreeImpl::TotalMaxScrollOffset() const {
gfx::ScrollOffset offset;
if (inner_viewport_scroll_layer_)
offset += inner_viewport_scroll_layer_->MaxScrollOffset();
if (outer_viewport_scroll_layer_)
offset += outer_viewport_scroll_layer_->MaxScrollOffset();
return offset;
}
scoped_ptr<LayerImpl> LayerTreeImpl::DetachLayerTree() {
// Clear all data structures that have direct references to the layer tree.
scrolling_layer_id_from_previous_tree_ =
currently_scrolling_layer_ ? currently_scrolling_layer_->id() : 0;
if (inner_viewport_scroll_layer_)
inner_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
if (outer_viewport_scroll_layer_)
outer_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
inner_viewport_scroll_delegate_proxy_ = nullptr;
outer_viewport_scroll_delegate_proxy_ = nullptr;
inner_viewport_scroll_layer_ = NULL;
outer_viewport_scroll_layer_ = NULL;
page_scale_layer_ = NULL;
currently_scrolling_layer_ = NULL;
render_surface_layer_list_.clear();
set_needs_update_draw_properties();
return root_layer_.Pass();
}
void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
// The request queue should have been processed and does not require a push.
DCHECK_EQ(ui_resource_request_queue_.size(), 0u);
if (next_activation_forces_redraw_) {
target_tree->ForceRedrawNextActivation();
next_activation_forces_redraw_ = false;
}
target_tree->PassSwapPromises(&swap_promise_list_);
target_tree->set_top_controls_shrink_blink_size(
top_controls_shrink_blink_size_);
target_tree->set_top_controls_height(top_controls_height_);
target_tree->PushTopControls(nullptr);
// Active tree already shares the page_scale_factor object with pending
// tree so only the limits need to be provided.
target_tree->PushPageScaleFactorAndLimits(nullptr, min_page_scale_factor(),
max_page_scale_factor());
target_tree->elastic_overscroll()->PushPendingToActive();
target_tree->pending_page_scale_animation_ =
pending_page_scale_animation_.Pass();
if (page_scale_layer_ && inner_viewport_scroll_layer_) {
target_tree->SetViewportLayersFromIds(
overscroll_elasticity_layer_ ? overscroll_elasticity_layer_->id()
: Layer::INVALID_ID,
page_scale_layer_->id(), inner_viewport_scroll_layer_->id(),
outer_viewport_scroll_layer_ ? outer_viewport_scroll_layer_->id()
: Layer::INVALID_ID);
} else {
target_tree->ClearViewportLayers();
}
target_tree->RegisterSelection(selection_start_, selection_end_);
// This should match the property synchronization in
// LayerTreeHost::finishCommitOnImplThread().
target_tree->set_source_frame_number(source_frame_number());
target_tree->set_background_color(background_color());
target_tree->set_has_transparent_background(has_transparent_background());
if (ContentsTexturesPurged())
target_tree->SetContentsTexturesPurged();
else
target_tree->ResetContentsTexturesPurged();
if (ViewportSizeInvalid())
target_tree->SetViewportSizeInvalid();
else
target_tree->ResetViewportSizeInvalid();
if (hud_layer())
target_tree->set_hud_layer(static_cast<HeadsUpDisplayLayerImpl*>(
LayerTreeHostCommon::FindLayerInSubtree(
target_tree->root_layer(), hud_layer()->id())));
else
target_tree->set_hud_layer(NULL);
target_tree->has_ever_been_drawn_ = false;
}
LayerImpl* LayerTreeImpl::InnerViewportContainerLayer() const {
return inner_viewport_scroll_layer_
? inner_viewport_scroll_layer_->scroll_clip_layer()
: NULL;
}
LayerImpl* LayerTreeImpl::OuterViewportContainerLayer() const {
return outer_viewport_scroll_layer_
? outer_viewport_scroll_layer_->scroll_clip_layer()
: NULL;
}
LayerImpl* LayerTreeImpl::CurrentlyScrollingLayer() const {
DCHECK(IsActiveTree());
return currently_scrolling_layer_;
}
void LayerTreeImpl::SetCurrentlyScrollingLayer(LayerImpl* layer) {
if (currently_scrolling_layer_ == layer)
return;
if (currently_scrolling_layer_ &&
currently_scrolling_layer_->scrollbar_animation_controller())
currently_scrolling_layer_->scrollbar_animation_controller()
->DidScrollEnd();
currently_scrolling_layer_ = layer;
if (layer && layer->scrollbar_animation_controller())
layer->scrollbar_animation_controller()->DidScrollBegin();
}
void LayerTreeImpl::ClearCurrentlyScrollingLayer() {
SetCurrentlyScrollingLayer(NULL);
scrolling_layer_id_from_previous_tree_ = 0;
}
namespace {
void ForceScrollbarParameterUpdateAfterScaleChange(LayerImpl* current_layer) {
if (!current_layer)
return;
while (current_layer) {
current_layer->ScrollbarParametersDidChange(false);
current_layer = current_layer->parent();
}
}
} // namespace
float LayerTreeImpl::ClampPageScaleFactorToLimits(
float page_scale_factor) const {
if (min_page_scale_factor_ && page_scale_factor < min_page_scale_factor_)
page_scale_factor = min_page_scale_factor_;
else if (max_page_scale_factor_ && page_scale_factor > max_page_scale_factor_)
page_scale_factor = max_page_scale_factor_;
return page_scale_factor;
}
void LayerTreeImpl::SetPageScaleOnActiveTree(float active_page_scale) {
DCHECK(IsActiveTree());
if (page_scale_factor()->SetCurrent(
ClampPageScaleFactorToLimits(active_page_scale)))
DidUpdatePageScale();
}
void LayerTreeImpl::PushPageScaleFromMainThread(float page_scale_factor,
float min_page_scale_factor,
float max_page_scale_factor) {
PushPageScaleFactorAndLimits(&page_scale_factor, min_page_scale_factor,
max_page_scale_factor);
}
void LayerTreeImpl::PushPageScaleFactorAndLimits(const float* page_scale_factor,
float min_page_scale_factor,
float max_page_scale_factor) {
DCHECK(page_scale_factor || IsActiveTree());
bool changed_page_scale = false;
if (page_scale_factor) {
DCHECK(!IsActiveTree() || !layer_tree_host_impl_->pending_tree());
changed_page_scale |=
page_scale_factor_->PushFromMainThread(*page_scale_factor);
}
if (IsActiveTree())
changed_page_scale |= page_scale_factor_->PushPendingToActive();
changed_page_scale |=
SetPageScaleFactorLimits(min_page_scale_factor, max_page_scale_factor);
if (changed_page_scale)
DidUpdatePageScale();
}
void LayerTreeImpl::set_top_controls_shrink_blink_size(bool shrink) {
if (top_controls_shrink_blink_size_ == shrink)
return;
top_controls_shrink_blink_size_ = shrink;
if (IsActiveTree())
layer_tree_host_impl_->UpdateViewportContainerSizes();
}
void LayerTreeImpl::set_top_controls_height(float top_controls_height) {
if (top_controls_height_ == top_controls_height)
return;
top_controls_height_ = top_controls_height;
if (IsActiveTree())
layer_tree_host_impl_->UpdateViewportContainerSizes();
}
bool LayerTreeImpl::SetCurrentTopControlsShownRatio(float ratio) {
ratio = std::max(ratio, 0.f);
ratio = std::min(ratio, 1.f);
return top_controls_shown_ratio_->SetCurrent(ratio);
}
void LayerTreeImpl::PushTopControlsFromMainThread(
float top_controls_shown_ratio) {
PushTopControls(&top_controls_shown_ratio);
}
void LayerTreeImpl::PushTopControls(const float* top_controls_shown_ratio) {
DCHECK(top_controls_shown_ratio || IsActiveTree());
if (top_controls_shown_ratio) {
DCHECK(!IsActiveTree() || !layer_tree_host_impl_->pending_tree());
top_controls_shown_ratio_->PushFromMainThread(*top_controls_shown_ratio);
}
if (IsActiveTree()) {
if (top_controls_shown_ratio_->PushPendingToActive())
layer_tree_host_impl_->DidChangeTopControlsPosition();
}
}
bool LayerTreeImpl::SetPageScaleFactorLimits(float min_page_scale_factor,
float max_page_scale_factor) {
if (min_page_scale_factor == min_page_scale_factor_ &&
max_page_scale_factor == max_page_scale_factor_)
return false;
min_page_scale_factor_ = min_page_scale_factor;
max_page_scale_factor_ = max_page_scale_factor;
return true;
}
void LayerTreeImpl::DidUpdatePageScale() {
if (IsActiveTree())
page_scale_factor()->SetCurrent(
ClampPageScaleFactorToLimits(current_page_scale_factor()));
set_needs_update_draw_properties();
if (root_layer_scroll_offset_delegate_) {
root_layer_scroll_offset_delegate_->UpdateRootLayerState(
TotalScrollOffset(), TotalMaxScrollOffset(), ScrollableSize(),
current_page_scale_factor(), min_page_scale_factor_,
max_page_scale_factor_);
}
ForceScrollbarParameterUpdateAfterScaleChange(page_scale_layer());
HideInnerViewportScrollbarsIfNearMinimumScale();
}
void LayerTreeImpl::HideInnerViewportScrollbarsIfNearMinimumScale() {
if (!InnerViewportContainerLayer())
return;
LayerImpl::ScrollbarSet* scrollbars =
InnerViewportContainerLayer()->scrollbars();
if (!scrollbars)
return;
for (LayerImpl::ScrollbarSet::iterator it = scrollbars->begin();
it != scrollbars->end();
++it) {
ScrollbarLayerImplBase* scrollbar = *it;
float minimum_scale_to_show_at =
min_page_scale_factor() * settings().scrollbar_show_scale_threshold;
scrollbar->SetHideLayerAndSubtree(
current_page_scale_factor() < minimum_scale_to_show_at);
}
}
SyncedProperty<ScaleGroup>* LayerTreeImpl::page_scale_factor() {
return page_scale_factor_.get();
}
const SyncedProperty<ScaleGroup>* LayerTreeImpl::page_scale_factor() const {
return page_scale_factor_.get();
}
gfx::SizeF LayerTreeImpl::ScrollableViewportSize() const {
if (!InnerViewportContainerLayer())
return gfx::SizeF();
return gfx::ScaleSize(InnerViewportContainerLayer()->BoundsForScrolling(),
1.0f / current_page_scale_factor());
}
gfx::Rect LayerTreeImpl::RootScrollLayerDeviceViewportBounds() const {
LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
? OuterViewportScrollLayer()
: InnerViewportScrollLayer();
if (!root_scroll_layer || root_scroll_layer->children().empty())
return gfx::Rect();
LayerImpl* layer = root_scroll_layer->children()[0];
return MathUtil::MapEnclosingClippedRect(layer->screen_space_transform(),
gfx::Rect(layer->content_bounds()));
}
void LayerTreeImpl::ApplySentScrollAndScaleDeltasFromAbortedCommit() {
DCHECK(IsActiveTree());
page_scale_factor()->AbortCommit();
top_controls_shown_ratio()->AbortCommit();
elastic_overscroll()->AbortCommit();
if (!root_layer())
return;
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer(), [](LayerImpl* layer) {
layer->ApplySentScrollDeltasFromAbortedCommit();
});
}
void LayerTreeImpl::SetViewportLayersFromIds(
int overscroll_elasticity_layer_id,
int page_scale_layer_id,
int inner_viewport_scroll_layer_id,
int outer_viewport_scroll_layer_id) {
overscroll_elasticity_layer_ = LayerById(overscroll_elasticity_layer_id);
page_scale_layer_ = LayerById(page_scale_layer_id);
DCHECK(page_scale_layer_);
inner_viewport_scroll_layer_ =
LayerById(inner_viewport_scroll_layer_id);
DCHECK(inner_viewport_scroll_layer_);
outer_viewport_scroll_layer_ =
LayerById(outer_viewport_scroll_layer_id);
DCHECK(outer_viewport_scroll_layer_ ||
outer_viewport_scroll_layer_id == Layer::INVALID_ID);
HideInnerViewportScrollbarsIfNearMinimumScale();
if (!root_layer_scroll_offset_delegate_)
return;
inner_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
new LayerScrollOffsetDelegateProxy(inner_viewport_scroll_layer_,
root_layer_scroll_offset_delegate_,
this));
if (outer_viewport_scroll_layer_)
outer_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
new LayerScrollOffsetDelegateProxy(outer_viewport_scroll_layer_,
root_layer_scroll_offset_delegate_,
this));
}
void LayerTreeImpl::ClearViewportLayers() {
page_scale_layer_ = NULL;
inner_viewport_scroll_layer_ = NULL;
outer_viewport_scroll_layer_ = NULL;
}
bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
if (!needs_update_draw_properties_)
return true;
// Calling UpdateDrawProperties must clear this flag, so there can be no
// early outs before this.
needs_update_draw_properties_ = false;
// For max_texture_size. When the renderer is re-created in
// CreateAndSetRenderer, the needs update draw properties flag is set
// again.
if (!layer_tree_host_impl_->renderer())
return false;
// Clear this after the renderer early out, as it should still be
// possible to hit test even without a renderer.
render_surface_layer_list_.clear();
if (!root_layer())
return false;
{
TRACE_EVENT2(
"cc", "LayerTreeImpl::UpdateDrawProperties::CalculateDrawProperties",
"IsActive", IsActiveTree(), "SourceFrameNumber", source_frame_number_);
LayerImpl* page_scale_layer =
page_scale_layer_ ? page_scale_layer_ : InnerViewportContainerLayer();
bool can_render_to_separate_surface =
(layer_tree_host_impl_->GetDrawMode() !=
DRAW_MODE_RESOURCELESS_SOFTWARE);
++render_surface_layer_list_id_;
LayerTreeHostCommon::CalcDrawPropsImplInputs inputs(
root_layer(), DrawViewportSize(),
layer_tree_host_impl_->DrawTransform(), device_scale_factor(),
current_page_scale_factor(), page_scale_layer,
elastic_overscroll()->Current(IsActiveTree()),
overscroll_elasticity_layer_, resource_provider()->max_texture_size(),
settings().can_use_lcd_text, settings().layers_always_allowed_lcd_text,
can_render_to_separate_surface,
settings().layer_transforms_should_scale_layer_contents,
settings().verify_property_trees,
&render_surface_layer_list_, render_surface_layer_list_id_);
LayerTreeHostCommon::CalculateDrawProperties(&inputs);
}
{
TRACE_EVENT2("cc", "LayerTreeImpl::UpdateDrawProperties::Occlusion",
"IsActive", IsActiveTree(), "SourceFrameNumber",
source_frame_number_);
OcclusionTracker<LayerImpl> occlusion_tracker(
root_layer()->render_surface()->content_rect());
occlusion_tracker.set_minimum_tracking_size(
settings().minimum_occlusion_tracking_size);
// LayerIterator is used here instead of CallFunctionForSubtree to only
// UpdateTilePriorities on layers that will be visible (and thus have valid
// draw properties) and not because any ordering is required.
auto end = LayerIterator<LayerImpl>::End(&render_surface_layer_list_);
for (auto it = LayerIterator<LayerImpl>::Begin(&render_surface_layer_list_);
it != end; ++it) {
occlusion_tracker.EnterLayer(it);
// There are very few render targets so this should be cheap to do for
// each layer instead of something more complicated.
bool inside_replica = false;
LayerImpl* layer = it->render_target();
while (layer && !inside_replica) {
if (layer->render_target()->has_replica())
inside_replica = true;
layer = layer->render_target()->parent();
}
// Don't use occlusion if a layer will appear in a replica, since the
// tile raster code does not know how to look for the replica and would
// consider it occluded even though the replica is visible.
// Since occlusion is only used for browser compositor (i.e.
// use_occlusion_for_tile_prioritization) and it won't use replicas,
// this should matter not.
if (it.represents_itself()) {
Occlusion occlusion =
inside_replica ? Occlusion()
: occlusion_tracker.GetCurrentOcclusionForLayer(
it->draw_transform());
it->draw_properties().occlusion_in_content_space = occlusion;
}
if (it.represents_contributing_render_surface()) {
// Surfaces aren't used by the tile raster code, so they can have
// occlusion regardless of replicas.
Occlusion occlusion =
occlusion_tracker.GetCurrentOcclusionForContributingSurface(
it->render_surface()->draw_transform());
it->render_surface()->set_occlusion_in_content_space(occlusion);
// Masks are used to draw the contributing surface, so should have
// the same occlusion as the surface (nothing inside the surface
// occludes them).
if (LayerImpl* mask = it->mask_layer()) {
Occlusion mask_occlusion =
inside_replica
? Occlusion()
: occlusion_tracker.GetCurrentOcclusionForContributingSurface(
it->render_surface()->draw_transform() *
it->draw_transform());
mask->draw_properties().occlusion_in_content_space = mask_occlusion;
}
if (LayerImpl* replica = it->replica_layer()) {
if (LayerImpl* mask = replica->mask_layer())
mask->draw_properties().occlusion_in_content_space = Occlusion();
}
}
occlusion_tracker.LeaveLayer(it);
}
unoccluded_screen_space_region_ =
occlusion_tracker.ComputeVisibleRegionInScreen();
}
// It'd be ideal if this could be done earlier, but when the raster source
// is updated from the main thread during push properties, update draw
// properties has not occurred yet and so it's not clear whether or not the
// layer can or cannot use lcd text. So, this is the cleanup pass to
// determine if the raster source needs to be replaced with a non-lcd
// raster source due to draw properties.
if (update_lcd_text) {
// TODO(enne): Make LTHI::sync_tree return this value.
LayerTreeImpl* sync_tree =
layer_tree_host_impl_->proxy()->CommitToActiveTree()
? layer_tree_host_impl_->active_tree()
: layer_tree_host_impl_->pending_tree();
// If this is not the sync tree, then it is not safe to update lcd text
// as it causes invalidations and the tiles may be in use.
DCHECK_EQ(this, sync_tree);
for (const auto& layer : picture_layers_)
layer->UpdateCanUseLCDTextAfterCommit();
}
{
TRACE_EVENT_BEGIN2("cc", "LayerTreeImpl::UpdateDrawProperties::UpdateTiles",
"IsActive", IsActiveTree(), "SourceFrameNumber",
source_frame_number_);
const bool resourceless_software_draw =
(layer_tree_host_impl_->GetDrawMode() ==
DRAW_MODE_RESOURCELESS_SOFTWARE);
size_t layers_updated_count = 0;
bool tile_priorities_updated = false;
for (PictureLayerImpl* layer : picture_layers_) {
if (!layer->IsDrawnRenderSurfaceLayerListMember())
continue;
++layers_updated_count;
tile_priorities_updated |= layer->UpdateTiles(resourceless_software_draw);
}
if (tile_priorities_updated)
DidModifyTilePriorities();
TRACE_EVENT_END1("cc", "LayerTreeImpl::UpdateTilePriorities",
"layers_updated_count", layers_updated_count);
}
DCHECK(!needs_update_draw_properties_) <<
"CalcDrawProperties should not set_needs_update_draw_properties()";
return true;
}
const LayerImplList& LayerTreeImpl::RenderSurfaceLayerList() const {
// If this assert triggers, then the list is dirty.
DCHECK(!needs_update_draw_properties_);
return render_surface_layer_list_;
}
const Region& LayerTreeImpl::UnoccludedScreenSpaceRegion() const {
// If this assert triggers, then the render_surface_layer_list_ is dirty, so
// the unoccluded_screen_space_region_ is not valid anymore.
DCHECK(!needs_update_draw_properties_);
return unoccluded_screen_space_region_;
}
gfx::Size LayerTreeImpl::ScrollableSize() const {
LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
? OuterViewportScrollLayer()
: InnerViewportScrollLayer();
if (!root_scroll_layer || root_scroll_layer->children().empty())
return gfx::Size();
return root_scroll_layer->children()[0]->bounds();
}
LayerImpl* LayerTreeImpl::LayerById(int id) {
LayerIdMap::iterator iter = layer_id_map_.find(id);
return iter != layer_id_map_.end() ? iter->second : NULL;
}
void LayerTreeImpl::RegisterLayer(LayerImpl* layer) {
DCHECK(!LayerById(layer->id()));
layer_id_map_[layer->id()] = layer;
}
void LayerTreeImpl::UnregisterLayer(LayerImpl* layer) {
DCHECK(LayerById(layer->id()));
layer_id_map_.erase(layer->id());
}
size_t LayerTreeImpl::NumLayers() {
return layer_id_map_.size();
}
void LayerTreeImpl::PushPersistedState(LayerTreeImpl* pending_tree) {
pending_tree->SetCurrentlyScrollingLayer(
LayerTreeHostCommon::FindLayerInSubtree(pending_tree->root_layer(),
currently_scrolling_layer_ ? currently_scrolling_layer_->id() : 0));
}
void LayerTreeImpl::DidBecomeActive() {
if (next_activation_forces_redraw_) {
layer_tree_host_impl_->SetFullRootLayerDamage();
next_activation_forces_redraw_ = false;
}
if (scrolling_layer_id_from_previous_tree_) {
currently_scrolling_layer_ = LayerTreeHostCommon::FindLayerInSubtree(
root_layer(), scrolling_layer_id_from_previous_tree_);
}
// Always reset this flag on activation, as we would only have activated
// if we were in a good state.
layer_tree_host_impl_->ResetRequiresHighResToDraw();
if (root_layer()) {
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer(), [](LayerImpl* layer) { layer->DidBecomeActive(); });
}
devtools_instrumentation::DidActivateLayerTree(layer_tree_host_impl_->id(),
source_frame_number_);
}
bool LayerTreeImpl::ContentsTexturesPurged() const {
return contents_textures_purged_;
}
void LayerTreeImpl::SetContentsTexturesPurged() {
if (contents_textures_purged_)
return;
contents_textures_purged_ = true;
layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}
void LayerTreeImpl::ResetContentsTexturesPurged() {
if (!contents_textures_purged_)
return;
contents_textures_purged_ = false;
layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}
bool LayerTreeImpl::RequiresHighResToDraw() const {
return layer_tree_host_impl_->RequiresHighResToDraw();
}
bool LayerTreeImpl::ViewportSizeInvalid() const {
return viewport_size_invalid_;
}
void LayerTreeImpl::SetViewportSizeInvalid() {
viewport_size_invalid_ = true;
layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}
void LayerTreeImpl::ResetViewportSizeInvalid() {
viewport_size_invalid_ = false;
layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}
Proxy* LayerTreeImpl::proxy() const {
return layer_tree_host_impl_->proxy();
}
const LayerTreeSettings& LayerTreeImpl::settings() const {
return layer_tree_host_impl_->settings();
}
const LayerTreeDebugState& LayerTreeImpl::debug_state() const {
return layer_tree_host_impl_->debug_state();
}
const RendererCapabilitiesImpl& LayerTreeImpl::GetRendererCapabilities() const {
return layer_tree_host_impl_->GetRendererCapabilities();
}
ContextProvider* LayerTreeImpl::context_provider() const {
return output_surface()->context_provider();
}
OutputSurface* LayerTreeImpl::output_surface() const {
return layer_tree_host_impl_->output_surface();
}
ResourceProvider* LayerTreeImpl::resource_provider() const {
return layer_tree_host_impl_->resource_provider();
}
TileManager* LayerTreeImpl::tile_manager() const {
return layer_tree_host_impl_->tile_manager();
}
FrameRateCounter* LayerTreeImpl::frame_rate_counter() const {
return layer_tree_host_impl_->fps_counter();
}
PaintTimeCounter* LayerTreeImpl::paint_time_counter() const {
return layer_tree_host_impl_->paint_time_counter();
}
MemoryHistory* LayerTreeImpl::memory_history() const {
return layer_tree_host_impl_->memory_history();
}
gfx::Size LayerTreeImpl::device_viewport_size() const {
return layer_tree_host_impl_->device_viewport_size();
}
float LayerTreeImpl::device_scale_factor() const {
return layer_tree_host_impl_->device_scale_factor();
}
DebugRectHistory* LayerTreeImpl::debug_rect_history() const {
return layer_tree_host_impl_->debug_rect_history();
}
bool LayerTreeImpl::IsActiveTree() const {
return layer_tree_host_impl_->active_tree() == this;
}
bool LayerTreeImpl::IsPendingTree() const {
return layer_tree_host_impl_->pending_tree() == this;
}
bool LayerTreeImpl::IsRecycleTree() const {
return layer_tree_host_impl_->recycle_tree() == this;
}
bool LayerTreeImpl::IsSyncTree() const {
return layer_tree_host_impl_->sync_tree() == this;
}
LayerImpl* LayerTreeImpl::FindActiveTreeLayerById(int id) {
LayerTreeImpl* tree = layer_tree_host_impl_->active_tree();
if (!tree)
return NULL;
return tree->LayerById(id);
}
LayerImpl* LayerTreeImpl::FindPendingTreeLayerById(int id) {
LayerTreeImpl* tree = layer_tree_host_impl_->pending_tree();
if (!tree)
return NULL;
return tree->LayerById(id);
}
bool LayerTreeImpl::PinchGestureActive() const {
return layer_tree_host_impl_->pinch_gesture_active();
}
BeginFrameArgs LayerTreeImpl::CurrentBeginFrameArgs() const {
return layer_tree_host_impl_->CurrentBeginFrameArgs();
}
base::TimeDelta LayerTreeImpl::begin_impl_frame_interval() const {
return layer_tree_host_impl_->begin_impl_frame_interval();
}
void LayerTreeImpl::SetNeedsCommit() {
layer_tree_host_impl_->SetNeedsCommit();
}
gfx::Rect LayerTreeImpl::DeviceViewport() const {
return layer_tree_host_impl_->DeviceViewport();
}
gfx::Size LayerTreeImpl::DrawViewportSize() const {
return layer_tree_host_impl_->DrawViewportSize();
}
const gfx::Rect LayerTreeImpl::ViewportRectForTilePriority() const {
return layer_tree_host_impl_->ViewportRectForTilePriority();
}
scoped_ptr<ScrollbarAnimationController>
LayerTreeImpl::CreateScrollbarAnimationController(LayerImpl* scrolling_layer) {
DCHECK(settings().scrollbar_fade_delay_ms);
DCHECK(settings().scrollbar_fade_duration_ms);
base::TimeDelta delay =
base::TimeDelta::FromMilliseconds(settings().scrollbar_fade_delay_ms);
base::TimeDelta resize_delay = base::TimeDelta::FromMilliseconds(
settings().scrollbar_fade_resize_delay_ms);
base::TimeDelta duration =
base::TimeDelta::FromMilliseconds(settings().scrollbar_fade_duration_ms);
switch (settings().scrollbar_animator) {
case LayerTreeSettings::LINEAR_FADE: {
return ScrollbarAnimationControllerLinearFade::Create(
scrolling_layer,
layer_tree_host_impl_,
delay,
resize_delay,
duration);
}
case LayerTreeSettings::THINNING: {
return ScrollbarAnimationControllerThinning::Create(scrolling_layer,
layer_tree_host_impl_,
delay,
resize_delay,
duration);
}
case LayerTreeSettings::NO_ANIMATOR:
NOTREACHED();
break;
}
return nullptr;
}
void LayerTreeImpl::DidAnimateScrollOffset() {
layer_tree_host_impl_->DidAnimateScrollOffset();
}
bool LayerTreeImpl::use_gpu_rasterization() const {
return layer_tree_host_impl_->use_gpu_rasterization();
}
GpuRasterizationStatus LayerTreeImpl::GetGpuRasterizationStatus() const {
return layer_tree_host_impl_->gpu_rasterization_status();
}
bool LayerTreeImpl::create_low_res_tiling() const {
return layer_tree_host_impl_->create_low_res_tiling();
}
void LayerTreeImpl::SetNeedsRedraw() {
layer_tree_host_impl_->SetNeedsRedraw();
}
AnimationRegistrar* LayerTreeImpl::GetAnimationRegistrar() const {
return layer_tree_host_impl_->animation_registrar();
}
void LayerTreeImpl::GetAllTilesForTracing(std::set<const Tile*>* tiles) const {
typedef LayerIterator<LayerImpl> LayerIteratorType;
LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list_);
for (LayerIteratorType it =
LayerIteratorType::Begin(&render_surface_layer_list_);
it != end;
++it) {
if (!it.represents_itself())
continue;
LayerImpl* layer_impl = *it;
layer_impl->GetAllTilesForTracing(tiles);
}
}
void LayerTreeImpl::AsValueInto(base::trace_event::TracedValue* state) const {
TracedValue::MakeDictIntoImplicitSnapshot(state, "cc::LayerTreeImpl", this);
state->SetInteger("source_frame_number", source_frame_number_);
state->BeginDictionary("root_layer");
root_layer_->AsValueInto(state);
state->EndDictionary();
state->BeginArray("render_surface_layer_list");
typedef LayerIterator<LayerImpl> LayerIteratorType;
LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list_);
for (LayerIteratorType it = LayerIteratorType::Begin(
&render_surface_layer_list_); it != end; ++it) {
if (!it.represents_itself())
continue;
TracedValue::AppendIDRef(*it, state);
}
state->EndArray();
state->BeginArray("swap_promise_trace_ids");
for (size_t i = 0; i < swap_promise_list_.size(); i++)
state->AppendDouble(swap_promise_list_[i]->TraceId());
state->EndArray();
}
void LayerTreeImpl::SetRootLayerScrollOffsetDelegate(
LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) {
if (root_layer_scroll_offset_delegate_ == root_layer_scroll_offset_delegate)
return;
if (!root_layer_scroll_offset_delegate) {
// Make sure we remove the proxies from their layers before
// releasing them.
if (InnerViewportScrollLayer())
InnerViewportScrollLayer()->SetScrollOffsetDelegate(NULL);
if (OuterViewportScrollLayer())
OuterViewportScrollLayer()->SetScrollOffsetDelegate(NULL);
inner_viewport_scroll_delegate_proxy_ = nullptr;
outer_viewport_scroll_delegate_proxy_ = nullptr;
}
root_layer_scroll_offset_delegate_ = root_layer_scroll_offset_delegate;
if (root_layer_scroll_offset_delegate_) {
root_layer_scroll_offset_delegate_->UpdateRootLayerState(
TotalScrollOffset(), TotalMaxScrollOffset(), ScrollableSize(),
current_page_scale_factor(), min_page_scale_factor(),
max_page_scale_factor());
if (inner_viewport_scroll_layer_) {
inner_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
new LayerScrollOffsetDelegateProxy(InnerViewportScrollLayer(),
root_layer_scroll_offset_delegate_,
this));
inner_viewport_scroll_layer_->SetScrollOffsetDelegate(
inner_viewport_scroll_delegate_proxy_.get());
}
if (outer_viewport_scroll_layer_) {
outer_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
new LayerScrollOffsetDelegateProxy(OuterViewportScrollLayer(),
root_layer_scroll_offset_delegate_,
this));
outer_viewport_scroll_layer_->SetScrollOffsetDelegate(
outer_viewport_scroll_delegate_proxy_.get());
}
if (inner_viewport_scroll_layer_)
inner_viewport_scroll_layer_->RefreshFromScrollDelegate();
if (outer_viewport_scroll_layer_)
outer_viewport_scroll_layer_->RefreshFromScrollDelegate();
if (inner_viewport_scroll_layer_)
UpdateScrollOffsetDelegate();
}
}
void LayerTreeImpl::OnRootLayerDelegatedScrollOffsetChanged() {
DCHECK(root_layer_scroll_offset_delegate_);
if (inner_viewport_scroll_layer_) {
inner_viewport_scroll_layer_->RefreshFromScrollDelegate();
}
if (outer_viewport_scroll_layer_) {
outer_viewport_scroll_layer_->RefreshFromScrollDelegate();
}
}
void LayerTreeImpl::UpdateScrollOffsetDelegate() {
DCHECK(InnerViewportScrollLayer());
DCHECK(!OuterViewportScrollLayer() || outer_viewport_scroll_delegate_proxy_);
DCHECK(root_layer_scroll_offset_delegate_);
gfx::ScrollOffset offset =
inner_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
if (OuterViewportScrollLayer())
offset += outer_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
root_layer_scroll_offset_delegate_->UpdateRootLayerState(
offset, TotalMaxScrollOffset(), ScrollableSize(),
current_page_scale_factor(), min_page_scale_factor(),
max_page_scale_factor());
}
gfx::ScrollOffset LayerTreeImpl::GetDelegatedScrollOffset(LayerImpl* layer) {
DCHECK(root_layer_scroll_offset_delegate_);
DCHECK(InnerViewportScrollLayer());
if (layer == InnerViewportScrollLayer() && !OuterViewportScrollLayer())
return root_layer_scroll_offset_delegate_->GetTotalScrollOffset();
// If we get here, we have both inner/outer viewports, and need to distribute
// the scroll offset between them.
DCHECK(inner_viewport_scroll_delegate_proxy_);
DCHECK(outer_viewport_scroll_delegate_proxy_);
gfx::ScrollOffset inner_viewport_offset =
inner_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
gfx::ScrollOffset outer_viewport_offset =
outer_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
// It may be nothing has changed.
gfx::ScrollOffset delegate_offset =
root_layer_scroll_offset_delegate_->GetTotalScrollOffset();
if (inner_viewport_offset + outer_viewport_offset == delegate_offset) {
if (layer == InnerViewportScrollLayer())
return inner_viewport_offset;
else
return outer_viewport_offset;
}
gfx::ScrollOffset max_outer_viewport_scroll_offset =
OuterViewportScrollLayer()->MaxScrollOffset();
outer_viewport_offset = delegate_offset - inner_viewport_offset;
outer_viewport_offset.SetToMin(max_outer_viewport_scroll_offset);
outer_viewport_offset.SetToMax(gfx::ScrollOffset());
if (layer == OuterViewportScrollLayer())
return outer_viewport_offset;
inner_viewport_offset = delegate_offset - outer_viewport_offset;
return inner_viewport_offset;
}
void LayerTreeImpl::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
DCHECK(swap_promise);
swap_promise_list_.push_back(swap_promise.Pass());
}
void LayerTreeImpl::PassSwapPromises(
ScopedPtrVector<SwapPromise>* new_swap_promise) {
swap_promise_list_.insert_and_take(swap_promise_list_.end(),
new_swap_promise);
new_swap_promise->clear();
}
void LayerTreeImpl::FinishSwapPromises(CompositorFrameMetadata* metadata) {
for (size_t i = 0; i < swap_promise_list_.size(); i++)
swap_promise_list_[i]->DidSwap(metadata);
swap_promise_list_.clear();
}
void LayerTreeImpl::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
for (size_t i = 0; i < swap_promise_list_.size(); i++)
swap_promise_list_[i]->DidNotSwap(reason);
swap_promise_list_.clear();
}
void LayerTreeImpl::DidModifyTilePriorities() {
layer_tree_host_impl_->DidModifyTilePriorities();
}
void LayerTreeImpl::set_ui_resource_request_queue(
const UIResourceRequestQueue& queue) {
ui_resource_request_queue_ = queue;
}
ResourceProvider::ResourceId LayerTreeImpl::ResourceIdForUIResource(
UIResourceId uid) const {
return layer_tree_host_impl_->ResourceIdForUIResource(uid);
}
bool LayerTreeImpl::IsUIResourceOpaque(UIResourceId uid) const {
return layer_tree_host_impl_->IsUIResourceOpaque(uid);
}
void LayerTreeImpl::ProcessUIResourceRequestQueue() {
for (const auto& req : ui_resource_request_queue_) {
switch (req.GetType()) {
case UIResourceRequest::UI_RESOURCE_CREATE:
layer_tree_host_impl_->CreateUIResource(req.GetId(), req.GetBitmap());
break;
case UIResourceRequest::UI_RESOURCE_DELETE:
layer_tree_host_impl_->DeleteUIResource(req.GetId());
break;
case UIResourceRequest::UI_RESOURCE_INVALID_REQUEST:
NOTREACHED();
break;
}
}
ui_resource_request_queue_.clear();
// If all UI resource evictions were not recreated by processing this queue,
// then another commit is required.
if (layer_tree_host_impl_->EvictedUIResourcesExist())
layer_tree_host_impl_->SetNeedsCommit();
}
void LayerTreeImpl::RegisterPictureLayerImpl(PictureLayerImpl* layer) {
DCHECK(std::find(picture_layers_.begin(), picture_layers_.end(), layer) ==
picture_layers_.end());
picture_layers_.push_back(layer);
}
void LayerTreeImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
std::vector<PictureLayerImpl*>::iterator it =
std::find(picture_layers_.begin(), picture_layers_.end(), layer);
DCHECK(it != picture_layers_.end());
picture_layers_.erase(it);
}
void LayerTreeImpl::AddLayerWithCopyOutputRequest(LayerImpl* layer) {
// Only the active tree needs to know about layers with copy requests, as
// they are aborted if not serviced during draw.
DCHECK(IsActiveTree());
// DCHECK(std::find(layers_with_copy_output_request_.begin(),
// layers_with_copy_output_request_.end(),
// layer) == layers_with_copy_output_request_.end());
// TODO(danakj): Remove this once crash is found crbug.com/309777
for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
CHECK(layers_with_copy_output_request_[i] != layer)
<< i << " of " << layers_with_copy_output_request_.size();
}
layers_with_copy_output_request_.push_back(layer);
}
void LayerTreeImpl::RemoveLayerWithCopyOutputRequest(LayerImpl* layer) {
// Only the active tree needs to know about layers with copy requests, as
// they are aborted if not serviced during draw.
DCHECK(IsActiveTree());
std::vector<LayerImpl*>::iterator it = std::find(
layers_with_copy_output_request_.begin(),
layers_with_copy_output_request_.end(),
layer);
DCHECK(it != layers_with_copy_output_request_.end());
layers_with_copy_output_request_.erase(it);
// TODO(danakj): Remove this once crash is found crbug.com/309777
for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
CHECK(layers_with_copy_output_request_[i] != layer)
<< i << " of " << layers_with_copy_output_request_.size();
}
}
const std::vector<LayerImpl*>& LayerTreeImpl::LayersWithCopyOutputRequest()
const {
// Only the active tree needs to know about layers with copy requests, as
// they are aborted if not serviced during draw.
DCHECK(IsActiveTree());
return layers_with_copy_output_request_;
}
template <typename LayerType>
static inline bool LayerClipsSubtree(LayerType* layer) {
return layer->masks_to_bounds() || layer->mask_layer();
}
static bool PointHitsRect(
const gfx::PointF& screen_space_point,
const gfx::Transform& local_space_to_screen_space_transform,
const gfx::RectF& local_space_rect,
float* distance_to_camera) {
// If the transform is not invertible, then assume that this point doesn't hit
// this rect.
gfx::Transform inverse_local_space_to_screen_space(
gfx::Transform::kSkipInitialization);
if (!local_space_to_screen_space_transform.GetInverse(
&inverse_local_space_to_screen_space))
return false;
// Transform the hit test point from screen space to the local space of the
// given rect.
bool clipped = false;
gfx::Point3F planar_point = MathUtil::ProjectPoint3D(
inverse_local_space_to_screen_space, screen_space_point, &clipped);
gfx::PointF hit_test_point_in_local_space =
gfx::PointF(planar_point.x(), planar_point.y());
// If ProjectPoint could not project to a valid value, then we assume that
// this point doesn't hit this rect.
if (clipped)
return false;
if (!local_space_rect.Contains(hit_test_point_in_local_space))
return false;
if (distance_to_camera) {
// To compute the distance to the camera, we have to take the planar point
// and pull it back to world space and compute the displacement along the
// z-axis.
gfx::Point3F planar_point_in_screen_space(planar_point);
local_space_to_screen_space_transform.TransformPoint(
&planar_point_in_screen_space);
*distance_to_camera = planar_point_in_screen_space.z();
}
return true;
}
static bool PointHitsRegion(const gfx::PointF& screen_space_point,
const gfx::Transform& screen_space_transform,
const Region& layer_space_region,
float layer_content_scale_x,
float layer_content_scale_y) {
// If the transform is not invertible, then assume that this point doesn't hit
// this region.
gfx::Transform inverse_screen_space_transform(
gfx::Transform::kSkipInitialization);
if (!screen_space_transform.GetInverse(&inverse_screen_space_transform))
return false;
// Transform the hit test point from screen space to the local space of the
// given region.
bool clipped = false;
gfx::PointF hit_test_point_in_content_space = MathUtil::ProjectPoint(
inverse_screen_space_transform, screen_space_point, &clipped);
gfx::PointF hit_test_point_in_layer_space =
gfx::ScalePoint(hit_test_point_in_content_space,
1.f / layer_content_scale_x,
1.f / layer_content_scale_y);
// If ProjectPoint could not project to a valid value, then we assume that
// this point doesn't hit this region.
if (clipped)
return false;
return layer_space_region.Contains(
gfx::ToRoundedPoint(hit_test_point_in_layer_space));
}
static const LayerImpl* GetNextClippingLayer(const LayerImpl* layer) {
if (layer->scroll_parent())
return layer->scroll_parent();
if (layer->clip_parent())
return layer->clip_parent();
return layer->parent();
}
static bool PointIsClippedBySurfaceOrClipRect(
const gfx::PointF& screen_space_point,
const LayerImpl* layer) {
// Walk up the layer tree and hit-test any render_surfaces and any layer
// clip rects that are active.
for (; layer; layer = GetNextClippingLayer(layer)) {
if (layer->render_surface() &&
!PointHitsRect(screen_space_point,
layer->render_surface()->screen_space_transform(),
layer->render_surface()->content_rect(),
NULL))
return true;
if (LayerClipsSubtree(layer) &&
!PointHitsRect(screen_space_point,
layer->screen_space_transform(),
gfx::Rect(layer->content_bounds()),
NULL))
return true;
}
// If we have finished walking all ancestors without having already exited,
// then the point is not clipped by any ancestors.
return false;
}
static bool PointHitsLayer(const LayerImpl* layer,
const gfx::PointF& screen_space_point,
float* distance_to_intersection) {
gfx::RectF content_rect(layer->content_bounds());
if (!PointHitsRect(screen_space_point,
layer->screen_space_transform(),
content_rect,
distance_to_intersection))
return false;
// At this point, we think the point does hit the layer, but we need to walk
// up the parents to ensure that the layer was not clipped in such a way
// that the hit point actually should not hit the layer.
if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer))
return false;
// Skip the HUD layer.
if (layer == layer->layer_tree_impl()->hud_layer())
return false;
return true;
}
struct FindClosestMatchingLayerDataForRecursion {
FindClosestMatchingLayerDataForRecursion()
: closest_match(NULL),
closest_distance(-std::numeric_limits<float>::infinity()) {}
LayerImpl* closest_match;
// Note that the positive z-axis points towards the camera, so bigger means
// closer in this case, counterintuitively.
float closest_distance;
};
template <typename Functor>
static void FindClosestMatchingLayer(
const gfx::PointF& screen_space_point,
LayerImpl* layer,
const Functor& func,
FindClosestMatchingLayerDataForRecursion* data_for_recursion) {
for (int i = layer->children().size() - 1; i >= 0; --i) {
FindClosestMatchingLayer(
screen_space_point, layer->children()[i], func, data_for_recursion);
}
float distance_to_intersection = 0.f;
if (func(layer) &&
PointHitsLayer(layer, screen_space_point, &distance_to_intersection) &&
((!data_for_recursion->closest_match ||
distance_to_intersection > data_for_recursion->closest_distance))) {
data_for_recursion->closest_distance = distance_to_intersection;
data_for_recursion->closest_match = layer;
}
}
static bool ScrollsAnyDrawnRenderSurfaceLayerListMember(LayerImpl* layer) {
if (!layer->scrollable())
return false;
if (layer->draw_properties().layer_or_descendant_is_drawn)
return true;
if (!layer->scroll_children())
return false;
for (std::set<LayerImpl*>::const_iterator it =
layer->scroll_children()->begin();
it != layer->scroll_children()->end();
++it) {
if ((*it)->draw_properties().layer_or_descendant_is_drawn)
return true;
}
return false;
}
struct FindScrollingLayerFunctor {
bool operator()(LayerImpl* layer) const {
return ScrollsAnyDrawnRenderSurfaceLayerListMember(layer);
}
};
LayerImpl* LayerTreeImpl::FindFirstScrollingLayerThatIsHitByPoint(
const gfx::PointF& screen_space_point) {
FindClosestMatchingLayerDataForRecursion data_for_recursion;
FindClosestMatchingLayer(screen_space_point,
root_layer(),
FindScrollingLayerFunctor(),
&data_for_recursion);
return data_for_recursion.closest_match;
}
struct HitTestVisibleScrollableOrTouchableFunctor {
bool operator()(LayerImpl* layer) const {
return layer->IsDrawnRenderSurfaceLayerListMember() ||
ScrollsAnyDrawnRenderSurfaceLayerListMember(layer) ||
!layer->touch_event_handler_region().IsEmpty() ||
layer->have_wheel_event_handlers();
}
};
LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPoint(
const gfx::PointF& screen_space_point) {
if (!root_layer())
return NULL;
bool update_lcd_text = false;
if (!UpdateDrawProperties(update_lcd_text))
return NULL;
FindClosestMatchingLayerDataForRecursion data_for_recursion;
FindClosestMatchingLayer(screen_space_point,
root_layer(),
HitTestVisibleScrollableOrTouchableFunctor(),
&data_for_recursion);
return data_for_recursion.closest_match;
}
static bool LayerHasTouchEventHandlersAt(const gfx::PointF& screen_space_point,
LayerImpl* layer_impl) {
if (layer_impl->touch_event_handler_region().IsEmpty())
return false;
if (!PointHitsRegion(screen_space_point,
layer_impl->screen_space_transform(),
layer_impl->touch_event_handler_region(),
layer_impl->contents_scale_x(),
layer_impl->contents_scale_y()))
return false;
// At this point, we think the point does hit the touch event handler region
// on the layer, but we need to walk up the parents to ensure that the layer
// was not clipped in such a way that the hit point actually should not hit
// the layer.
if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl))
return false;
return true;
}
struct FindWheelEventLayerFunctor {
bool operator()(LayerImpl* layer) const {
return layer->have_wheel_event_handlers();
}
};
LayerImpl* LayerTreeImpl::FindLayerWithWheelHandlerThatIsHitByPoint(
const gfx::PointF& screen_space_point) {
if (!root_layer())
return NULL;
bool update_lcd_text = false;
if (!UpdateDrawProperties(update_lcd_text))
return NULL;
FindWheelEventLayerFunctor func;
FindClosestMatchingLayerDataForRecursion data_for_recursion;
FindClosestMatchingLayer(screen_space_point, root_layer(), func,
&data_for_recursion);
return data_for_recursion.closest_match;
}
struct FindTouchEventLayerFunctor {
bool operator()(LayerImpl* layer) const {
return LayerHasTouchEventHandlersAt(screen_space_point, layer);
}
const gfx::PointF screen_space_point;
};
LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPointInTouchHandlerRegion(
const gfx::PointF& screen_space_point) {
if (!root_layer())
return NULL;
bool update_lcd_text = false;
if (!UpdateDrawProperties(update_lcd_text))
return NULL;
FindTouchEventLayerFunctor func = {screen_space_point};
FindClosestMatchingLayerDataForRecursion data_for_recursion;
FindClosestMatchingLayer(
screen_space_point, root_layer(), func, &data_for_recursion);
return data_for_recursion.closest_match;
}
void LayerTreeImpl::RegisterSelection(const LayerSelectionBound& start,
const LayerSelectionBound& end) {
selection_start_ = start;
selection_end_ = end;
}
static ViewportSelectionBound ComputeViewportSelection(
const LayerSelectionBound& layer_bound,
LayerImpl* layer,
float device_scale_factor) {
ViewportSelectionBound viewport_bound;
viewport_bound.type = layer_bound.type;
if (!layer || layer_bound.type == SELECTION_BOUND_EMPTY)
return viewport_bound;
gfx::PointF layer_scaled_top = gfx::ScalePoint(layer_bound.edge_top,
layer->contents_scale_x(),
layer->contents_scale_y());
gfx::PointF layer_scaled_bottom = gfx::ScalePoint(layer_bound.edge_bottom,
layer->contents_scale_x(),
layer->contents_scale_y());
bool clipped = false;
gfx::PointF screen_top = MathUtil::MapPoint(
layer->screen_space_transform(), layer_scaled_top, &clipped);
gfx::PointF screen_bottom = MathUtil::MapPoint(
layer->screen_space_transform(), layer_scaled_bottom, &clipped);
const float inv_scale = 1.f / device_scale_factor;
viewport_bound.edge_top = gfx::ScalePoint(screen_top, inv_scale);
viewport_bound.edge_bottom = gfx::ScalePoint(screen_bottom, inv_scale);
// The bottom edge point is used for visibility testing as it is the logical
// focal point for bound selection handles (this may change in the future).
// Shifting the visibility point fractionally inward ensures that neighboring
// or logically coincident layers aligned to integral DPI coordinates will not
// spuriously occlude the bound.
gfx::Vector2dF visibility_offset = layer_scaled_top - layer_scaled_bottom;
visibility_offset.Scale(device_scale_factor / visibility_offset.Length());
gfx::PointF visibility_point = layer_scaled_bottom + visibility_offset;
if (visibility_point.x() <= 0)
visibility_point.set_x(visibility_point.x() + device_scale_factor);
visibility_point = MathUtil::MapPoint(
layer->screen_space_transform(), visibility_point, &clipped);
float intersect_distance = 0.f;
viewport_bound.visible =
PointHitsLayer(layer, visibility_point, &intersect_distance);
return viewport_bound;
}
void LayerTreeImpl::GetViewportSelection(ViewportSelectionBound* start,
ViewportSelectionBound* end) {
DCHECK(start);
DCHECK(end);
*start = ComputeViewportSelection(
selection_start_,
selection_start_.layer_id ? LayerById(selection_start_.layer_id) : NULL,
device_scale_factor());
if (start->type == SELECTION_BOUND_CENTER ||
start->type == SELECTION_BOUND_EMPTY) {
*end = *start;
} else {
*end = ComputeViewportSelection(
selection_end_,
selection_end_.layer_id ? LayerById(selection_end_.layer_id) : NULL,
device_scale_factor());
}
}
void LayerTreeImpl::InputScrollAnimationFinished() {
layer_tree_host_impl_->ScrollEnd();
}
bool LayerTreeImpl::SmoothnessTakesPriority() const {
return layer_tree_host_impl_->GetTreePriority() == SMOOTHNESS_TAKES_PRIORITY;
}
BlockingTaskRunner* LayerTreeImpl::BlockingMainThreadTaskRunner() const {
return proxy()->blocking_main_thread_task_runner();
}
void LayerTreeImpl::SetPendingPageScaleAnimation(
scoped_ptr<PendingPageScaleAnimation> pending_animation) {
pending_page_scale_animation_ = pending_animation.Pass();
}
scoped_ptr<PendingPageScaleAnimation>
LayerTreeImpl::TakePendingPageScaleAnimation() {
return pending_page_scale_animation_.Pass();
}
} // namespace cc