// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/layers/picture_layer_impl.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <cmath>
#include <limits>
#include <set>
#include "base/time/time.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/base/histograms.h"
#include "cc/base/math_util.h"
#include "cc/debug/debug_colors.h"
#include "cc/debug/micro_benchmark_impl.h"
#include "cc/debug/traced_value.h"
#include "cc/layers/append_quads_data.h"
#include "cc/layers/solid_color_layer_impl.h"
#include "cc/output/begin_frame_args.h"
#include "cc/quads/debug_border_draw_quad.h"
#include "cc/quads/picture_draw_quad.h"
#include "cc/quads/solid_color_draw_quad.h"
#include "cc/quads/tile_draw_quad.h"
#include "cc/tiles/tile_manager.h"
#include "cc/tiles/tiling_set_raster_queue_all.h"
#include "cc/trees/layer_tree_impl.h"
#include "cc/trees/occlusion.h"
#include "ui/gfx/geometry/quad_f.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
namespace {
// This must be > 1 as we multiply or divide by this to find a new raster
// scale during pinch.
const float kMaxScaleRatioDuringPinch = 2.0f;
// When creating a new tiling during pinch, snap to an existing
// tiling's scale if the desired scale is within this ratio.
const float kSnapToExistingTilingRatio = 1.2f;
// Even for really wide viewports, at some point GPU raster should use
// less than 4 tiles to fill the viewport. This is set to 256 as a
// sane minimum for now, but we might want to tune this for low-end.
const int kMinHeightForGpuRasteredTile = 256;
// When making odd-sized tiles, round them up to increase the chances
// of using the same tile size.
const int kTileRoundUp = 64;
} // namespace
namespace cc {
PictureLayerImpl::PictureLayerImpl(
LayerTreeImpl* tree_impl,
int id,
bool is_mask,
scoped_refptr<SyncedScrollOffset> scroll_offset)
: LayerImpl(tree_impl, id, scroll_offset),
twin_layer_(nullptr),
tilings_(CreatePictureLayerTilingSet()),
ideal_page_scale_(0.f),
ideal_device_scale_(0.f),
ideal_source_scale_(0.f),
ideal_contents_scale_(0.f),
raster_page_scale_(0.f),
raster_device_scale_(0.f),
raster_source_scale_(0.f),
raster_contents_scale_(0.f),
low_res_raster_contents_scale_(0.f),
was_screen_space_transform_animating_(false),
only_used_low_res_last_append_quads_(false),
is_mask_(is_mask),
nearest_neighbor_(false) {
layer_tree_impl()->RegisterPictureLayerImpl(this);
}
PictureLayerImpl::~PictureLayerImpl() {
if (twin_layer_)
twin_layer_->twin_layer_ = nullptr;
layer_tree_impl()->UnregisterPictureLayerImpl(this);
}
const char* PictureLayerImpl::LayerTypeAsString() const {
return "cc::PictureLayerImpl";
}
scoped_ptr<LayerImpl> PictureLayerImpl::CreateLayerImpl(
LayerTreeImpl* tree_impl) {
return PictureLayerImpl::Create(tree_impl, id(), is_mask_,
synced_scroll_offset());
}
void PictureLayerImpl::PushPropertiesTo(LayerImpl* base_layer) {
PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
DCHECK_EQ(layer_impl->is_mask_, is_mask_);
LayerImpl::PushPropertiesTo(base_layer);
// Twin relationships should never change once established.
DCHECK(!twin_layer_ || twin_layer_ == layer_impl);
DCHECK(!twin_layer_ || layer_impl->twin_layer_ == this);
// The twin relationship does not need to exist before the first
// PushPropertiesTo from pending to active layer since before that the active
// layer can not have a pile or tilings, it has only been created and inserted
// into the tree at that point.
twin_layer_ = layer_impl;
layer_impl->twin_layer_ = this;
layer_impl->SetNearestNeighbor(nearest_neighbor_);
// Solid color layers have no tilings.
DCHECK(!raster_source_->IsSolidColor() || tilings_->num_tilings() == 0);
// The pending tree should only have a high res (and possibly low res) tiling.
DCHECK_LE(tilings_->num_tilings(),
layer_tree_impl()->create_low_res_tiling() ? 2u : 1u);
layer_impl->set_gpu_raster_max_texture_size(gpu_raster_max_texture_size_);
layer_impl->UpdateRasterSource(raster_source_, &invalidation_,
tilings_.get());
DCHECK(invalidation_.IsEmpty());
// After syncing a solid color layer, the active layer has no tilings.
DCHECK(!raster_source_->IsSolidColor() ||
layer_impl->tilings_->num_tilings() == 0);
layer_impl->raster_page_scale_ = raster_page_scale_;
layer_impl->raster_device_scale_ = raster_device_scale_;
layer_impl->raster_source_scale_ = raster_source_scale_;
layer_impl->raster_contents_scale_ = raster_contents_scale_;
layer_impl->low_res_raster_contents_scale_ = low_res_raster_contents_scale_;
layer_impl->SanityCheckTilingState();
// We always need to push properties.
// See http://crbug.com/303943
// TODO(danakj): Stop always pushing properties since we don't swap tilings.
needs_push_properties_ = true;
}
void PictureLayerImpl::AppendQuads(RenderPass* render_pass,
AppendQuadsData* append_quads_data) {
// The bounds and the pile size may differ if the pile wasn't updated (ie.
// PictureLayer::Update didn't happen). In that case the pile will be empty.
DCHECK(raster_source_->GetSize().IsEmpty() ||
bounds() == raster_source_->GetSize())
<< " bounds " << bounds().ToString() << " pile "
<< raster_source_->GetSize().ToString();
SharedQuadState* shared_quad_state =
render_pass->CreateAndAppendSharedQuadState();
if (raster_source_->IsSolidColor()) {
PopulateSharedQuadState(shared_quad_state);
AppendDebugBorderQuad(
render_pass, bounds(), shared_quad_state, append_quads_data);
SolidColorLayerImpl::AppendSolidQuads(
render_pass, draw_properties().occlusion_in_content_space,
shared_quad_state, visible_layer_rect(),
raster_source_->GetSolidColor(), append_quads_data);
return;
}
float max_contents_scale = MaximumTilingContentsScale();
PopulateScaledSharedQuadState(shared_quad_state, max_contents_scale);
Occlusion scaled_occlusion =
draw_properties()
.occlusion_in_content_space.GetOcclusionWithGivenDrawTransform(
shared_quad_state->quad_to_target_transform);
if (current_draw_mode_ == DRAW_MODE_RESOURCELESS_SOFTWARE) {
AppendDebugBorderQuad(
render_pass, shared_quad_state->quad_layer_bounds, shared_quad_state,
append_quads_data, DebugColors::DirectPictureBorderColor(),
DebugColors::DirectPictureBorderWidth(layer_tree_impl()));
gfx::Rect geometry_rect = shared_quad_state->visible_quad_layer_rect;
gfx::Rect opaque_rect = contents_opaque() ? geometry_rect : gfx::Rect();
gfx::Rect visible_geometry_rect =
scaled_occlusion.GetUnoccludedContentRect(geometry_rect);
// The raster source may not be valid over the entire visible rect,
// and rastering outside of that may cause incorrect pixels.
gfx::Rect scaled_recorded_viewport = gfx::ScaleToEnclosingRect(
raster_source_->RecordedViewport(), max_contents_scale);
geometry_rect.Intersect(scaled_recorded_viewport);
opaque_rect.Intersect(scaled_recorded_viewport);
visible_geometry_rect.Intersect(scaled_recorded_viewport);
if (visible_geometry_rect.IsEmpty())
return;
DCHECK(raster_source_->HasRecordings());
gfx::Rect quad_content_rect = shared_quad_state->visible_quad_layer_rect;
gfx::Size texture_size = quad_content_rect.size();
gfx::RectF texture_rect = gfx::RectF(gfx::SizeF(texture_size));
PictureDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<PictureDrawQuad>();
quad->SetNew(shared_quad_state, geometry_rect, opaque_rect,
visible_geometry_rect, texture_rect, texture_size,
nearest_neighbor_, RGBA_8888, quad_content_rect,
max_contents_scale, raster_source_);
ValidateQuadResources(quad);
return;
}
AppendDebugBorderQuad(render_pass, shared_quad_state->quad_layer_bounds,
shared_quad_state, append_quads_data);
if (ShowDebugBorders()) {
for (PictureLayerTilingSet::CoverageIterator iter(
tilings_.get(), max_contents_scale,
shared_quad_state->visible_quad_layer_rect, ideal_contents_scale_);
iter; ++iter) {
SkColor color;
float width;
if (*iter && iter->draw_info().IsReadyToDraw()) {
TileDrawInfo::Mode mode = iter->draw_info().mode();
if (mode == TileDrawInfo::SOLID_COLOR_MODE) {
color = DebugColors::SolidColorTileBorderColor();
width = DebugColors::SolidColorTileBorderWidth(layer_tree_impl());
} else if (mode == TileDrawInfo::OOM_MODE) {
color = DebugColors::OOMTileBorderColor();
width = DebugColors::OOMTileBorderWidth(layer_tree_impl());
} else if (iter.resolution() == HIGH_RESOLUTION) {
color = DebugColors::HighResTileBorderColor();
width = DebugColors::HighResTileBorderWidth(layer_tree_impl());
} else if (iter.resolution() == LOW_RESOLUTION) {
color = DebugColors::LowResTileBorderColor();
width = DebugColors::LowResTileBorderWidth(layer_tree_impl());
} else if (iter->contents_scale() > max_contents_scale) {
color = DebugColors::ExtraHighResTileBorderColor();
width = DebugColors::ExtraHighResTileBorderWidth(layer_tree_impl());
} else {
color = DebugColors::ExtraLowResTileBorderColor();
width = DebugColors::ExtraLowResTileBorderWidth(layer_tree_impl());
}
} else {
color = DebugColors::MissingTileBorderColor();
width = DebugColors::MissingTileBorderWidth(layer_tree_impl());
}
DebugBorderDrawQuad* debug_border_quad =
render_pass->CreateAndAppendDrawQuad<DebugBorderDrawQuad>();
gfx::Rect geometry_rect = iter.geometry_rect();
gfx::Rect visible_geometry_rect = geometry_rect;
debug_border_quad->SetNew(shared_quad_state,
geometry_rect,
visible_geometry_rect,
color,
width);
}
}
// Keep track of the tilings that were used so that tilings that are
// unused can be considered for removal.
last_append_quads_tilings_.clear();
// Ignore missing tiles outside of viewport for tile priority. This is
// normally the same as draw viewport but can be independently overridden by
// embedders like Android WebView with SetExternalTilePriorityConstraints.
gfx::Rect scaled_viewport_for_tile_priority = gfx::ScaleToEnclosingRect(
viewport_rect_for_tile_priority_in_content_space_, max_contents_scale);
size_t missing_tile_count = 0u;
size_t on_demand_missing_tile_count = 0u;
only_used_low_res_last_append_quads_ = true;
gfx::Rect scaled_recorded_viewport = gfx::ScaleToEnclosingRect(
raster_source_->RecordedViewport(), max_contents_scale);
for (PictureLayerTilingSet::CoverageIterator iter(
tilings_.get(), max_contents_scale,
shared_quad_state->visible_quad_layer_rect, ideal_contents_scale_);
iter; ++iter) {
gfx::Rect geometry_rect = iter.geometry_rect();
gfx::Rect opaque_rect = contents_opaque() ? geometry_rect : gfx::Rect();
gfx::Rect visible_geometry_rect =
scaled_occlusion.GetUnoccludedContentRect(geometry_rect);
if (visible_geometry_rect.IsEmpty())
continue;
append_quads_data->visible_layer_area +=
visible_geometry_rect.width() * visible_geometry_rect.height();
bool has_draw_quad = false;
if (*iter && iter->draw_info().IsReadyToDraw()) {
const TileDrawInfo& draw_info = iter->draw_info();
switch (draw_info.mode()) {
case TileDrawInfo::RESOURCE_MODE: {
gfx::RectF texture_rect = iter.texture_rect();
// The raster_contents_scale_ is the best scale that the layer is
// trying to produce, even though it may not be ideal. Since that's
// the best the layer can promise in the future, consider those as
// complete. But if a tile is ideal scale, we don't want to consider
// it incomplete and trying to replace it with a tile at a worse
// scale.
if (iter->contents_scale() != raster_contents_scale_ &&
iter->contents_scale() != ideal_contents_scale_ &&
geometry_rect.Intersects(scaled_viewport_for_tile_priority)) {
append_quads_data->num_incomplete_tiles++;
}
TileDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<TileDrawQuad>();
quad->SetNew(shared_quad_state, geometry_rect, opaque_rect,
visible_geometry_rect, draw_info.resource_id(),
texture_rect, draw_info.resource_size(),
draw_info.contents_swizzled(), nearest_neighbor_);
ValidateQuadResources(quad);
iter->draw_info().set_was_ever_used_to_draw();
has_draw_quad = true;
break;
}
case TileDrawInfo::SOLID_COLOR_MODE: {
SolidColorDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
quad->SetNew(shared_quad_state, geometry_rect, visible_geometry_rect,
draw_info.solid_color(), false);
ValidateQuadResources(quad);
iter->draw_info().set_was_ever_used_to_draw();
has_draw_quad = true;
break;
}
case TileDrawInfo::OOM_MODE:
break; // Checkerboard.
}
}
if (!has_draw_quad) {
// Checkerboard.
SkColor color = SafeOpaqueBackgroundColor();
if (ShowDebugBorders()) {
// Fill the whole tile with the missing tile color.
color = DebugColors::OOMTileBorderColor();
}
SolidColorDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
quad->SetNew(shared_quad_state, geometry_rect, visible_geometry_rect,
color, false);
ValidateQuadResources(quad);
if (geometry_rect.Intersects(scaled_viewport_for_tile_priority)) {
append_quads_data->num_missing_tiles++;
++missing_tile_count;
// We only keep track of discardable images if we're using raster tasks,
// so we only gather stats in this case.
if (layer_tree_impl()->settings().image_decode_tasks_enabled) {
if (raster_source_->HasDiscardableImageInRect(geometry_rect))
append_quads_data->num_missing_tiles_some_image_content++;
else
append_quads_data->num_missing_tiles_no_image_content++;
}
}
int64_t checkerboarded_area =
visible_geometry_rect.width() * visible_geometry_rect.height();
append_quads_data->checkerboarded_visible_content_area +=
checkerboarded_area;
// Intersect checkerboard rect with interest rect to generate rect where
// we checkerboarded and has recording. The area where we don't have
// recording is not necessarily a Rect, and its area is calculated using
// subtraction.
gfx::Rect visible_rect_has_recording = visible_geometry_rect;
visible_rect_has_recording.Intersect(scaled_recorded_viewport);
int64_t checkerboarded_has_recording_area =
visible_rect_has_recording.width() *
visible_rect_has_recording.height();
append_quads_data->checkerboarded_needs_raster_content_area +=
checkerboarded_has_recording_area;
append_quads_data->checkerboarded_no_recording_content_area +=
checkerboarded_area - checkerboarded_has_recording_area;
continue;
}
if (iter.resolution() != HIGH_RESOLUTION) {
append_quads_data->approximated_visible_content_area +=
visible_geometry_rect.width() * visible_geometry_rect.height();
}
// If we have a draw quad, but it's not low resolution, then
// mark that we've used something other than low res to draw.
if (iter.resolution() != LOW_RESOLUTION)
only_used_low_res_last_append_quads_ = false;
if (last_append_quads_tilings_.empty() ||
last_append_quads_tilings_.back() != iter.CurrentTiling()) {
last_append_quads_tilings_.push_back(iter.CurrentTiling());
}
}
if (missing_tile_count) {
TRACE_EVENT_INSTANT2("cc",
"PictureLayerImpl::AppendQuads checkerboard",
TRACE_EVENT_SCOPE_THREAD,
"missing_tile_count",
missing_tile_count,
"on_demand_missing_tile_count",
on_demand_missing_tile_count);
}
// Aggressively remove any tilings that are not seen to save memory. Note
// that this is at the expense of doing cause more frequent re-painting. A
// better scheme would be to maintain a tighter visible_layer_rect for the
// finer tilings.
CleanUpTilingsOnActiveLayer(last_append_quads_tilings_);
}
bool PictureLayerImpl::UpdateTiles() {
if (!CanHaveTilings()) {
ideal_page_scale_ = 0.f;
ideal_device_scale_ = 0.f;
ideal_contents_scale_ = 0.f;
ideal_source_scale_ = 0.f;
SanityCheckTilingState();
return false;
}
// Remove any non-ideal tilings that were not used last time we generated
// quads to save memory and processing time. Note that pending tree should
// only have one or two tilings (high and low res), so only clean up the
// active layer. This cleans it up here in case AppendQuads didn't run.
// If it did run, this would not remove any additional tilings.
if (layer_tree_impl()->IsActiveTree())
CleanUpTilingsOnActiveLayer(last_append_quads_tilings_);
UpdateIdealScales();
if (!raster_contents_scale_ || ShouldAdjustRasterScale()) {
RecalculateRasterScales();
AddTilingsForRasterScale();
}
if (layer_tree_impl()->IsActiveTree())
AddLowResolutionTilingIfNeeded();
DCHECK(raster_page_scale_);
DCHECK(raster_device_scale_);
DCHECK(raster_source_scale_);
DCHECK(raster_contents_scale_);
DCHECK(low_res_raster_contents_scale_);
was_screen_space_transform_animating_ =
draw_properties().screen_space_transform_is_animating;
if (screen_space_transform_is_animating())
raster_source_->SetShouldAttemptToUseDistanceFieldText();
double current_frame_time_in_seconds =
(layer_tree_impl()->CurrentBeginFrameArgs().frame_time -
base::TimeTicks()).InSecondsF();
UpdateViewportRectForTilePriorityInContentSpace();
// The tiling set can require tiles for activation any of the following
// conditions are true:
// - This layer produced a high-res or non-ideal-res tile last frame.
// - We're in requires high res to draw mode.
// - We're not in smoothness takes priority mode.
// To put different, the tiling set can't require tiles for activation if
// we're in smoothness mode and only used low-res or checkerboard to draw last
// frame and we don't need high res to draw.
//
// The reason for this is that we should be able to activate sooner and get a
// more up to date recording, so we don't run out of recording on the active
// tree.
bool can_require_tiles_for_activation =
!only_used_low_res_last_append_quads_ || RequiresHighResToDraw() ||
!layer_tree_impl()->SmoothnessTakesPriority();
static const Occlusion kEmptyOcclusion;
const Occlusion& occlusion_in_content_space =
layer_tree_impl()->settings().use_occlusion_for_tile_prioritization
? draw_properties().occlusion_in_content_space
: kEmptyOcclusion;
// Pass |occlusion_in_content_space| for |occlusion_in_layer_space| since
// they are the same space in picture layer, as contents scale is always 1.
bool updated = tilings_->UpdateTilePriorities(
viewport_rect_for_tile_priority_in_content_space_, ideal_contents_scale_,
current_frame_time_in_seconds, occlusion_in_content_space,
can_require_tiles_for_activation);
return updated;
}
void PictureLayerImpl::UpdateViewportRectForTilePriorityInContentSpace() {
// If visible_layer_rect() is empty or viewport_rect_for_tile_priority is
// set to be different from the device viewport, try to inverse project the
// viewport into layer space and use that. Otherwise just use
// visible_layer_rect().
gfx::Rect visible_rect_in_content_space = visible_layer_rect();
gfx::Rect viewport_rect_for_tile_priority =
layer_tree_impl()->ViewportRectForTilePriority();
if (visible_rect_in_content_space.IsEmpty() ||
layer_tree_impl()->DeviceViewport() != viewport_rect_for_tile_priority) {
gfx::Transform view_to_layer(gfx::Transform::kSkipInitialization);
if (ScreenSpaceTransform().GetInverse(&view_to_layer)) {
// Transform from view space to content space.
visible_rect_in_content_space = MathUtil::ProjectEnclosingClippedRect(
view_to_layer, viewport_rect_for_tile_priority);
// We have to allow for a viewport that is outside of the layer bounds in
// order to compute tile priorities correctly for offscreen content that
// is going to make it on screen. However, we also have to limit the
// viewport since it can be very large due to screen_space_transforms. As
// a heuristic, we clip to bounds padded by skewport_extrapolation_limit *
// maximum tiling scale, since this should allow sufficient room for
// skewport calculations.
gfx::Rect padded_bounds(bounds());
int padding_amount = layer_tree_impl()
->settings()
.skewport_extrapolation_limit_in_content_pixels *
MaximumTilingContentsScale();
padded_bounds.Inset(-padding_amount, -padding_amount);
visible_rect_in_content_space.Intersect(padded_bounds);
}
}
viewport_rect_for_tile_priority_in_content_space_ =
visible_rect_in_content_space;
}
PictureLayerImpl* PictureLayerImpl::GetPendingOrActiveTwinLayer() const {
if (!twin_layer_ || !twin_layer_->IsOnActiveOrPendingTree())
return nullptr;
return twin_layer_;
}
void PictureLayerImpl::UpdateRasterSource(
scoped_refptr<DisplayListRasterSource> raster_source,
Region* new_invalidation,
const PictureLayerTilingSet* pending_set) {
// The bounds and the pile size may differ if the pile wasn't updated (ie.
// PictureLayer::Update didn't happen). In that case the pile will be empty.
DCHECK(raster_source->GetSize().IsEmpty() ||
bounds() == raster_source->GetSize())
<< " bounds " << bounds().ToString() << " pile "
<< raster_source->GetSize().ToString();
// The |raster_source_| is initially null, so have to check for that for the
// first frame.
bool could_have_tilings = raster_source_.get() && CanHaveTilings();
raster_source_.swap(raster_source);
// Only set the image decode controller when we're committing.
if (!pending_set) {
raster_source_->SetImageDecodeController(
layer_tree_impl()->tile_manager()->GetImageDecodeController());
}
// The |new_invalidation| must be cleared before updating tilings since they
// access the invalidation through the PictureLayerTilingClient interface.
invalidation_.Clear();
invalidation_.Swap(new_invalidation);
bool can_have_tilings = CanHaveTilings();
DCHECK(!pending_set ||
can_have_tilings == GetPendingOrActiveTwinLayer()->CanHaveTilings());
// Need to call UpdateTiles again if CanHaveTilings changed.
if (could_have_tilings != can_have_tilings)
layer_tree_impl()->set_needs_update_draw_properties();
if (!can_have_tilings) {
RemoveAllTilings();
return;
}
// We could do this after doing UpdateTiles, which would avoid doing this for
// tilings that are going to disappear on the pending tree (if scale changed).
// But that would also be more complicated, so we just do it here for now.
if (pending_set) {
tilings_->UpdateTilingsToCurrentRasterSourceForActivation(
raster_source_, pending_set, invalidation_, MinimumContentsScale(),
MaximumContentsScale());
} else {
tilings_->UpdateTilingsToCurrentRasterSourceForCommit(
raster_source_, invalidation_, MinimumContentsScale(),
MaximumContentsScale());
}
}
void PictureLayerImpl::UpdateCanUseLCDTextAfterCommit() {
// This function is only allowed to be called after commit, due to it not
// being smart about sharing tiles and because otherwise it would cause
// flashes by switching out tiles in place that may be currently on screen.
DCHECK(layer_tree_impl()->IsSyncTree());
// Don't allow the LCD text state to change once disabled.
if (!RasterSourceUsesLCDText())
return;
if (can_use_lcd_text() == RasterSourceUsesLCDText())
return;
// Raster sources are considered const, so in order to update the state
// a new one must be created and all tiles recreated.
scoped_refptr<DisplayListRasterSource> new_raster_source =
raster_source_->CreateCloneWithoutLCDText();
raster_source_.swap(new_raster_source);
// Synthetically invalidate everything.
gfx::Rect bounds_rect(bounds());
invalidation_ = Region(bounds_rect);
tilings_->UpdateRasterSourceDueToLCDChange(raster_source_, invalidation_);
SetUpdateRect(bounds_rect);
DCHECK(!RasterSourceUsesLCDText());
}
bool PictureLayerImpl::RasterSourceUsesLCDText() const {
return raster_source_ ? raster_source_->CanUseLCDText()
: layer_tree_impl()->settings().can_use_lcd_text;
}
void PictureLayerImpl::NotifyTileStateChanged(const Tile* tile) {
if (layer_tree_impl()->IsActiveTree()) {
gfx::Rect layer_damage_rect = gfx::ScaleToEnclosingRect(
tile->content_rect(), 1.f / tile->contents_scale());
AddDamageRect(layer_damage_rect);
}
if (tile->draw_info().NeedsRaster()) {
PictureLayerTiling* tiling =
tilings_->FindTilingWithScale(tile->contents_scale());
if (tiling)
tiling->set_all_tiles_done(false);
}
}
void PictureLayerImpl::DidBeginTracing() {
raster_source_->DidBeginTracing();
}
void PictureLayerImpl::ReleaseResources() {
// Recreate tilings with new settings, since some of those might change when
// we release resources.
tilings_ = nullptr;
ResetRasterScale();
}
void PictureLayerImpl::RecreateResources() {
tilings_ = CreatePictureLayerTilingSet();
// To avoid an edge case after lost context where the tree is up to date but
// the tilings have not been managed, request an update draw properties
// to force tilings to get managed.
layer_tree_impl()->set_needs_update_draw_properties();
}
skia::RefPtr<SkPicture> PictureLayerImpl::GetPicture() {
return raster_source_->GetFlattenedPicture();
}
Region PictureLayerImpl::GetInvalidationRegion() {
// |invalidation_| gives the invalidation contained in the source frame, but
// is not cleared after drawing from the layer. However, update_rect() is
// cleared once the invalidation is drawn, which is useful for debugging
// visualizations. This method intersects the two to give a more exact
// representation of what was invalidated that is cleared after drawing.
return IntersectRegions(invalidation_, update_rect());
}
ScopedTilePtr PictureLayerImpl::CreateTile(const Tile::CreateInfo& info) {
int flags = 0;
// We don't handle solid color masks, so we shouldn't bother analyzing those.
// Otherwise, always analyze to maximize memory savings.
if (!is_mask_)
flags = Tile::USE_PICTURE_ANALYSIS;
if (contents_opaque())
flags |= Tile::IS_OPAQUE;
return layer_tree_impl()->tile_manager()->CreateTile(
info, id(), layer_tree_impl()->source_frame_number(), flags);
}
const Region* PictureLayerImpl::GetPendingInvalidation() {
if (layer_tree_impl()->IsPendingTree())
return &invalidation_;
if (layer_tree_impl()->IsRecycleTree())
return nullptr;
DCHECK(layer_tree_impl()->IsActiveTree());
if (PictureLayerImpl* twin_layer = GetPendingOrActiveTwinLayer())
return &twin_layer->invalidation_;
return nullptr;
}
const PictureLayerTiling* PictureLayerImpl::GetPendingOrActiveTwinTiling(
const PictureLayerTiling* tiling) const {
PictureLayerImpl* twin_layer = GetPendingOrActiveTwinLayer();
if (!twin_layer)
return nullptr;
return twin_layer->tilings_->FindTilingWithScale(tiling->contents_scale());
}
bool PictureLayerImpl::RequiresHighResToDraw() const {
return layer_tree_impl()->RequiresHighResToDraw();
}
gfx::Rect PictureLayerImpl::GetEnclosingRectInTargetSpace() const {
return GetScaledEnclosingRectInTargetSpace(MaximumTilingContentsScale());
}
gfx::Size PictureLayerImpl::CalculateTileSize(
const gfx::Size& content_bounds) const {
int max_texture_size =
layer_tree_impl()->resource_provider()->max_texture_size();
if (is_mask_) {
// Masks are not tiled, so if we can't cover the whole mask with one tile,
// we shouldn't have such a tiling at all.
DCHECK_LE(content_bounds.width(), max_texture_size);
DCHECK_LE(content_bounds.height(), max_texture_size);
return content_bounds;
}
int default_tile_width = 0;
int default_tile_height = 0;
if (layer_tree_impl()->use_gpu_rasterization()) {
// For GPU rasterization, we pick an ideal tile size using the viewport
// so we don't need any settings. The current approach uses 4 tiles
// to cover the viewport vertically.
int viewport_width = gpu_raster_max_texture_size_.width();
int viewport_height = gpu_raster_max_texture_size_.height();
default_tile_width = viewport_width;
// Also, increase the height proportionally as the width decreases, and
// pad by our border texels to make the tiles exactly match the viewport.
int divisor = 4;
if (content_bounds.width() <= viewport_width / 2)
divisor = 2;
if (content_bounds.width() <= viewport_width / 4)
divisor = 1;
default_tile_height =
MathUtil::UncheckedRoundUp(viewport_height, divisor) / divisor;
// Grow default sizes to account for overlapping border texels.
default_tile_width += 2 * PictureLayerTiling::kBorderTexels;
default_tile_height += 2 * PictureLayerTiling::kBorderTexels;
default_tile_height =
std::max(default_tile_height, kMinHeightForGpuRasteredTile);
} else {
// For CPU rasterization we use tile-size settings.
const LayerTreeSettings& settings = layer_tree_impl()->settings();
int max_untiled_content_width = settings.max_untiled_layer_size.width();
int max_untiled_content_height = settings.max_untiled_layer_size.height();
default_tile_width = settings.default_tile_size.width();
default_tile_height = settings.default_tile_size.height();
// If the content width is small, increase tile size vertically.
// If the content height is small, increase tile size horizontally.
// If both are less than the untiled-size, use a single tile.
if (content_bounds.width() < default_tile_width)
default_tile_height = max_untiled_content_height;
if (content_bounds.height() < default_tile_height)
default_tile_width = max_untiled_content_width;
if (content_bounds.width() < max_untiled_content_width &&
content_bounds.height() < max_untiled_content_height) {
default_tile_height = max_untiled_content_height;
default_tile_width = max_untiled_content_width;
}
}
int tile_width = default_tile_width;
int tile_height = default_tile_height;
// Clamp the tile width/height to the content width/height to save space.
if (content_bounds.width() < default_tile_width) {
tile_width = std::min(tile_width, content_bounds.width());
tile_width = MathUtil::UncheckedRoundUp(tile_width, kTileRoundUp);
tile_width = std::min(tile_width, default_tile_width);
}
if (content_bounds.height() < default_tile_height) {
tile_height = std::min(tile_height, content_bounds.height());
tile_height = MathUtil::UncheckedRoundUp(tile_height, kTileRoundUp);
tile_height = std::min(tile_height, default_tile_height);
}
// Under no circumstance should we be larger than the max texture size.
tile_width = std::min(tile_width, max_texture_size);
tile_height = std::min(tile_height, max_texture_size);
return gfx::Size(tile_width, tile_height);
}
void PictureLayerImpl::GetContentsResourceId(ResourceId* resource_id,
gfx::Size* resource_size) const {
// The bounds and the pile size may differ if the pile wasn't updated (ie.
// PictureLayer::Update didn't happen). In that case the pile will be empty.
DCHECK(raster_source_->GetSize().IsEmpty() ||
bounds() == raster_source_->GetSize())
<< " bounds " << bounds().ToString() << " pile "
<< raster_source_->GetSize().ToString();
gfx::Rect content_rect(bounds());
PictureLayerTilingSet::CoverageIterator iter(
tilings_.get(), 1.f, content_rect, ideal_contents_scale_);
// Mask resource not ready yet.
if (!iter || !*iter) {
*resource_id = 0;
return;
}
// Masks only supported if they fit on exactly one tile.
DCHECK(iter.geometry_rect() == content_rect)
<< "iter rect " << iter.geometry_rect().ToString() << " content rect "
<< content_rect.ToString();
const TileDrawInfo& draw_info = iter->draw_info();
if (!draw_info.IsReadyToDraw() ||
draw_info.mode() != TileDrawInfo::RESOURCE_MODE) {
*resource_id = 0;
return;
}
*resource_id = draw_info.resource_id();
*resource_size = draw_info.resource_size();
}
void PictureLayerImpl::SetNearestNeighbor(bool nearest_neighbor) {
if (nearest_neighbor_ == nearest_neighbor)
return;
nearest_neighbor_ = nearest_neighbor;
NoteLayerPropertyChanged();
}
PictureLayerTiling* PictureLayerImpl::AddTiling(float contents_scale) {
DCHECK(CanHaveTilings());
DCHECK_GE(contents_scale, MinimumContentsScale());
DCHECK_LE(contents_scale, MaximumContentsScale());
DCHECK(raster_source_->HasRecordings());
return tilings_->AddTiling(contents_scale, raster_source_);
}
void PictureLayerImpl::RemoveAllTilings() {
tilings_->RemoveAllTilings();
// If there are no tilings, then raster scales are no longer meaningful.
ResetRasterScale();
}
void PictureLayerImpl::AddTilingsForRasterScale() {
// Reset all resolution enums on tilings, we'll be setting new values in this
// function.
tilings_->MarkAllTilingsNonIdeal();
PictureLayerTiling* high_res =
tilings_->FindTilingWithScale(raster_contents_scale_);
if (!high_res) {
// We always need a high res tiling, so create one if it doesn't exist.
high_res = AddTiling(raster_contents_scale_);
} else if (high_res->may_contain_low_resolution_tiles()) {
// If the tiling we find here was LOW_RESOLUTION previously, it may not be
// fully rastered, so destroy the old tiles.
high_res->Reset();
// Reset the flag now that we'll make it high res, it will have fully
// rastered content.
high_res->reset_may_contain_low_resolution_tiles();
}
high_res->set_resolution(HIGH_RESOLUTION);
if (layer_tree_impl()->IsPendingTree()) {
// On the pending tree, drop any tilings that are non-ideal since we don't
// need them to activate anyway.
tilings_->RemoveNonIdealTilings();
}
SanityCheckTilingState();
}
bool PictureLayerImpl::ShouldAdjustRasterScale() const {
if (was_screen_space_transform_animating_ !=
draw_properties().screen_space_transform_is_animating)
return true;
if (draw_properties().screen_space_transform_is_animating &&
raster_contents_scale_ != ideal_contents_scale_ &&
ShouldAdjustRasterScaleDuringScaleAnimations())
return true;
bool is_pinching = layer_tree_impl()->PinchGestureActive();
if (is_pinching && raster_page_scale_) {
// We change our raster scale when it is:
// - Higher than ideal (need a lower-res tiling available)
// - Too far from ideal (need a higher-res tiling available)
float ratio = ideal_page_scale_ / raster_page_scale_;
if (raster_page_scale_ > ideal_page_scale_ ||
ratio > kMaxScaleRatioDuringPinch)
return true;
}
if (!is_pinching) {
// When not pinching, match the ideal page scale factor.
if (raster_page_scale_ != ideal_page_scale_)
return true;
}
// Always match the ideal device scale factor.
if (raster_device_scale_ != ideal_device_scale_)
return true;
// When the source scale changes we want to match it, but not when animating.
if (!draw_properties().screen_space_transform_is_animating &&
raster_source_scale_ != ideal_source_scale_)
return true;
if (raster_contents_scale_ > MaximumContentsScale())
return true;
if (raster_contents_scale_ < MinimumContentsScale())
return true;
return false;
}
void PictureLayerImpl::AddLowResolutionTilingIfNeeded() {
DCHECK(layer_tree_impl()->IsActiveTree());
if (!layer_tree_impl()->create_low_res_tiling())
return;
// We should have a high resolution tiling at raster_contents_scale, so if the
// low res one is the same then we shouldn't try to override this tiling by
// marking it as a low res.
if (raster_contents_scale_ == low_res_raster_contents_scale_)
return;
PictureLayerTiling* low_res =
tilings_->FindTilingWithScale(low_res_raster_contents_scale_);
DCHECK(!low_res || low_res->resolution() != HIGH_RESOLUTION);
// Only create new low res tilings when the transform is static. This
// prevents wastefully creating a paired low res tiling for every new high
// res tiling during a pinch or a CSS animation.
bool is_pinching = layer_tree_impl()->PinchGestureActive();
bool is_animating = draw_properties().screen_space_transform_is_animating;
if (!is_pinching && !is_animating) {
if (!low_res)
low_res = AddTiling(low_res_raster_contents_scale_);
low_res->set_resolution(LOW_RESOLUTION);
}
}
void PictureLayerImpl::RecalculateRasterScales() {
const float old_raster_contents_scale = raster_contents_scale_;
const float old_raster_page_scale = raster_page_scale_;
raster_device_scale_ = ideal_device_scale_;
raster_page_scale_ = ideal_page_scale_;
raster_source_scale_ = ideal_source_scale_;
raster_contents_scale_ = ideal_contents_scale_;
// During pinch we completely ignore the current ideal scale, and just use
// a multiple of the previous scale.
bool is_pinching = layer_tree_impl()->PinchGestureActive();
if (is_pinching && old_raster_contents_scale) {
// See ShouldAdjustRasterScale:
// - When zooming out, preemptively create new tiling at lower resolution.
// - When zooming in, approximate ideal using multiple of kMaxScaleRatio.
bool zooming_out = old_raster_page_scale > ideal_page_scale_;
float desired_contents_scale = old_raster_contents_scale;
if (zooming_out) {
while (desired_contents_scale > ideal_contents_scale_)
desired_contents_scale /= kMaxScaleRatioDuringPinch;
} else {
while (desired_contents_scale < ideal_contents_scale_)
desired_contents_scale *= kMaxScaleRatioDuringPinch;
}
raster_contents_scale_ = tilings_->GetSnappedContentsScale(
desired_contents_scale, kSnapToExistingTilingRatio);
raster_page_scale_ =
raster_contents_scale_ / raster_device_scale_ / raster_source_scale_;
}
// If we're not re-rasterizing during animation, rasterize at the maximum
// scale that will occur during the animation, if the maximum scale is
// known. However we want to avoid excessive memory use. If the scale is
// smaller than what we would choose otherwise, then it's always better off
// for us memory-wise. But otherwise, we don't choose a scale at which this
// layer's rastered content would become larger than the viewport.
if (draw_properties().screen_space_transform_is_animating &&
!ShouldAdjustRasterScaleDuringScaleAnimations()) {
bool can_raster_at_maximum_scale = false;
bool should_raster_at_starting_scale = false;
float maximum_scale = draw_properties().maximum_animation_contents_scale;
float starting_scale = draw_properties().starting_animation_contents_scale;
if (maximum_scale) {
gfx::Size bounds_at_maximum_scale =
gfx::ScaleToCeiledSize(raster_source_->GetSize(), maximum_scale);
int64_t maximum_area =
static_cast<int64_t>(bounds_at_maximum_scale.width()) *
static_cast<int64_t>(bounds_at_maximum_scale.height());
gfx::Size viewport = layer_tree_impl()->device_viewport_size();
int64_t viewport_area = static_cast<int64_t>(viewport.width()) *
static_cast<int64_t>(viewport.height());
if (maximum_area <= viewport_area)
can_raster_at_maximum_scale = true;
}
if (starting_scale && starting_scale > maximum_scale) {
gfx::Size bounds_at_starting_scale =
gfx::ScaleToCeiledSize(raster_source_->GetSize(), starting_scale);
int64_t start_area =
static_cast<int64_t>(bounds_at_starting_scale.width()) *
static_cast<int64_t>(bounds_at_starting_scale.height());
gfx::Size viewport = layer_tree_impl()->device_viewport_size();
int64_t viewport_area = static_cast<int64_t>(viewport.width()) *
static_cast<int64_t>(viewport.height());
if (start_area <= viewport_area)
should_raster_at_starting_scale = true;
}
// Use the computed scales for the raster scale directly, do not try to use
// the ideal scale here. The current ideal scale may be way too large in the
// case of an animation with scale, and will be constantly changing.
if (should_raster_at_starting_scale)
raster_contents_scale_ = starting_scale;
else if (can_raster_at_maximum_scale)
raster_contents_scale_ = maximum_scale;
else
raster_contents_scale_ = 1.f * ideal_page_scale_ * ideal_device_scale_;
}
raster_contents_scale_ =
std::max(raster_contents_scale_, MinimumContentsScale());
raster_contents_scale_ =
std::min(raster_contents_scale_, MaximumContentsScale());
DCHECK_GE(raster_contents_scale_, MinimumContentsScale());
DCHECK_LE(raster_contents_scale_, MaximumContentsScale());
// If this layer would create zero or one tiles at this content scale,
// don't create a low res tiling.
gfx::Size raster_bounds =
gfx::ScaleToCeiledSize(raster_source_->GetSize(), raster_contents_scale_);
gfx::Size tile_size = CalculateTileSize(raster_bounds);
bool tile_covers_bounds = tile_size.width() >= raster_bounds.width() &&
tile_size.height() >= raster_bounds.height();
if (tile_size.IsEmpty() || tile_covers_bounds) {
low_res_raster_contents_scale_ = raster_contents_scale_;
return;
}
float low_res_factor =
layer_tree_impl()->settings().low_res_contents_scale_factor;
low_res_raster_contents_scale_ =
std::max(raster_contents_scale_ * low_res_factor, MinimumContentsScale());
DCHECK_LE(low_res_raster_contents_scale_, raster_contents_scale_);
DCHECK_GE(low_res_raster_contents_scale_, MinimumContentsScale());
DCHECK_LE(low_res_raster_contents_scale_, MaximumContentsScale());
}
void PictureLayerImpl::CleanUpTilingsOnActiveLayer(
const std::vector<PictureLayerTiling*>& used_tilings) {
DCHECK(layer_tree_impl()->IsActiveTree());
if (tilings_->num_tilings() == 0)
return;
float min_acceptable_high_res_scale = std::min(
raster_contents_scale_, ideal_contents_scale_);
float max_acceptable_high_res_scale = std::max(
raster_contents_scale_, ideal_contents_scale_);
PictureLayerImpl* twin = GetPendingOrActiveTwinLayer();
if (twin && twin->CanHaveTilings()) {
min_acceptable_high_res_scale = std::min(
min_acceptable_high_res_scale,
std::min(twin->raster_contents_scale_, twin->ideal_contents_scale_));
max_acceptable_high_res_scale = std::max(
max_acceptable_high_res_scale,
std::max(twin->raster_contents_scale_, twin->ideal_contents_scale_));
}
PictureLayerTilingSet* twin_set = twin ? twin->tilings_.get() : nullptr;
tilings_->CleanUpTilings(min_acceptable_high_res_scale,
max_acceptable_high_res_scale, used_tilings,
twin_set);
DCHECK_GT(tilings_->num_tilings(), 0u);
SanityCheckTilingState();
}
float PictureLayerImpl::MinimumContentsScale() const {
float setting_min = layer_tree_impl()->settings().minimum_contents_scale;
// If the contents scale is less than 1 / width (also for height),
// then it will end up having less than one pixel of content in that
// dimension. Bump the minimum contents scale up in this case to prevent
// this from happening.
int min_dimension = std::min(raster_source_->GetSize().width(),
raster_source_->GetSize().height());
if (!min_dimension)
return setting_min;
return std::max(1.f / min_dimension, setting_min);
}
float PictureLayerImpl::MaximumContentsScale() const {
// Masks can not have tilings that would become larger than the
// max_texture_size since they use a single tile for the entire
// tiling. Other layers can have tilings of any scale.
if (!is_mask_)
return std::numeric_limits<float>::max();
int max_texture_size =
layer_tree_impl()->resource_provider()->max_texture_size();
float max_scale_width =
static_cast<float>(max_texture_size) / bounds().width();
float max_scale_height =
static_cast<float>(max_texture_size) / bounds().height();
float max_scale = std::min(max_scale_width, max_scale_height);
// We require that multiplying the layer size by the contents scale and
// ceiling produces a value <= |max_texture_size|. Because for large layer
// sizes floating point ambiguity may crop up, making the result larger or
// smaller than expected, we use a slightly smaller floating point value for
// the scale, to help ensure that the resulting content bounds will never end
// up larger than |max_texture_size|.
return nextafterf(max_scale, 0.f);
}
void PictureLayerImpl::ResetRasterScale() {
raster_page_scale_ = 0.f;
raster_device_scale_ = 0.f;
raster_source_scale_ = 0.f;
raster_contents_scale_ = 0.f;
low_res_raster_contents_scale_ = 0.f;
}
bool PictureLayerImpl::CanHaveTilings() const {
if (raster_source_->IsSolidColor())
return false;
if (!DrawsContent())
return false;
if (!raster_source_->HasRecordings())
return false;
// If the |raster_source_| has a recording it should have non-empty bounds.
DCHECK(!raster_source_->GetSize().IsEmpty());
if (MaximumContentsScale() < MinimumContentsScale())
return false;
return true;
}
void PictureLayerImpl::SanityCheckTilingState() const {
#if DCHECK_IS_ON()
if (!CanHaveTilings()) {
DCHECK_EQ(0u, tilings_->num_tilings());
return;
}
if (tilings_->num_tilings() == 0)
return;
// We should only have one high res tiling.
DCHECK_EQ(1, tilings_->NumHighResTilings());
#endif
}
bool PictureLayerImpl::ShouldAdjustRasterScaleDuringScaleAnimations() const {
return layer_tree_impl()->use_gpu_rasterization();
}
float PictureLayerImpl::MaximumTilingContentsScale() const {
float max_contents_scale = tilings_->GetMaximumContentsScale();
return std::max(max_contents_scale, MinimumContentsScale());
}
scoped_ptr<PictureLayerTilingSet>
PictureLayerImpl::CreatePictureLayerTilingSet() {
const LayerTreeSettings& settings = layer_tree_impl()->settings();
return PictureLayerTilingSet::Create(
GetTree(), this, settings.tiling_interest_area_padding,
layer_tree_impl()->use_gpu_rasterization()
? settings.gpu_rasterization_skewport_target_time_in_seconds
: settings.skewport_target_time_in_seconds,
settings.skewport_extrapolation_limit_in_content_pixels);
}
void PictureLayerImpl::UpdateIdealScales() {
DCHECK(CanHaveTilings());
float min_contents_scale = MinimumContentsScale();
DCHECK_GT(min_contents_scale, 0.f);
ideal_page_scale_ = IsAffectedByPageScale()
? layer_tree_impl()->current_page_scale_factor()
: 1.f;
ideal_device_scale_ = layer_tree_impl()->device_scale_factor();
ideal_contents_scale_ = std::max(GetIdealContentsScale(), min_contents_scale);
ideal_source_scale_ =
ideal_contents_scale_ / ideal_page_scale_ / ideal_device_scale_;
}
void PictureLayerImpl::GetDebugBorderProperties(
SkColor* color,
float* width) const {
*color = DebugColors::TiledContentLayerBorderColor();
*width = DebugColors::TiledContentLayerBorderWidth(layer_tree_impl());
}
void PictureLayerImpl::GetAllPrioritizedTilesForTracing(
std::vector<PrioritizedTile>* prioritized_tiles) const {
if (!tilings_)
return;
tilings_->GetAllPrioritizedTilesForTracing(prioritized_tiles);
}
void PictureLayerImpl::AsValueInto(
base::trace_event::TracedValue* state) const {
LayerImpl::AsValueInto(state);
state->SetDouble("ideal_contents_scale", ideal_contents_scale_);
state->SetDouble("raster_contents_scale", raster_contents_scale_);
state->SetDouble("geometry_contents_scale", MaximumTilingContentsScale());
state->BeginArray("tilings");
tilings_->AsValueInto(state);
state->EndArray();
MathUtil::AddToTracedValue("tile_priority_rect",
viewport_rect_for_tile_priority_in_content_space_,
state);
MathUtil::AddToTracedValue("visible_rect", visible_layer_rect(), state);
state->BeginArray("pictures");
raster_source_->AsValueInto(state);
state->EndArray();
state->BeginArray("invalidation");
invalidation_.AsValueInto(state);
state->EndArray();
state->BeginArray("coverage_tiles");
for (PictureLayerTilingSet::CoverageIterator iter(
tilings_.get(), 1.f, gfx::Rect(raster_source_->GetSize()),
ideal_contents_scale_);
iter; ++iter) {
state->BeginDictionary();
MathUtil::AddToTracedValue("geometry_rect", iter.geometry_rect(), state);
if (*iter)
TracedValue::SetIDRef(*iter, state, "tile");
state->EndDictionary();
}
state->EndArray();
}
size_t PictureLayerImpl::GPUMemoryUsageInBytes() const {
return tilings_->GPUMemoryUsageInBytes();
}
void PictureLayerImpl::RunMicroBenchmark(MicroBenchmarkImpl* benchmark) {
benchmark->RunOnLayer(this);
}
WhichTree PictureLayerImpl::GetTree() const {
return layer_tree_impl()->IsActiveTree() ? ACTIVE_TREE : PENDING_TREE;
}
bool PictureLayerImpl::IsOnActiveOrPendingTree() const {
return !layer_tree_impl()->IsRecycleTree();
}
bool PictureLayerImpl::HasValidTilePriorities() const {
return IsOnActiveOrPendingTree() && IsDrawnRenderSurfaceLayerListMember();
}
} // namespace cc