// 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 <algorithm>
#include <limits>
#include <set>
#include "base/debug/trace_event_argument.h"
#include "base/time/time.h"
#include "cc/base/math_util.h"
#include "cc/base/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/checkerboard_draw_quad.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/resources/tile_manager.h"
#include "cc/trees/layer_tree_impl.h"
#include "cc/trees/occlusion_tracker.h"
#include "ui/gfx/quad_f.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/size_conversions.h"
namespace {
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;
// Estimate skewport 60 frames ahead for pre-rasterization on the CPU.
const float kCpuSkewportTargetTimeInFrames = 60.0f;
// Don't pre-rasterize on the GPU (except for kBackflingGuardDistancePixels in
// TileManager::BinFromTilePriority).
const float kGpuSkewportTargetTimeInFrames = 0.0f;
} // namespace
namespace cc {
PictureLayerImpl::Pair::Pair() : active(NULL), pending(NULL) {
}
PictureLayerImpl::Pair::Pair(PictureLayerImpl* active_layer,
PictureLayerImpl* pending_layer)
: active(active_layer), pending(pending_layer) {
}
PictureLayerImpl::Pair::~Pair() {
}
PictureLayerImpl::PictureLayerImpl(LayerTreeImpl* tree_impl, int id)
: LayerImpl(tree_impl, id),
twin_layer_(NULL),
pile_(PicturePileImpl::Create()),
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),
raster_source_scale_is_fixed_(false),
was_screen_space_transform_animating_(false),
needs_post_commit_initialization_(true),
should_update_tile_priorities_(false) {
layer_tree_impl()->RegisterPictureLayerImpl(this);
}
PictureLayerImpl::~PictureLayerImpl() {
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()).PassAs<LayerImpl>();
}
void PictureLayerImpl::PushPropertiesTo(LayerImpl* base_layer) {
// It's possible this layer was never drawn or updated (e.g. because it was
// a descendant of an opacity 0 layer).
DoPostCommitInitializationIfNeeded();
PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
// We have already synced the important bits from the the active layer, and
// we will soon swap out its tilings and use them for recycling. However,
// there are now tiles in this layer's tilings that were unref'd and replaced
// with new tiles (due to invalidation). This resets all active priorities on
// the to-be-recycled tiling to ensure replaced tiles don't linger and take
// memory (due to a stale 'active' priority).
if (layer_impl->tilings_)
layer_impl->tilings_->DidBecomeRecycled();
LayerImpl::PushPropertiesTo(base_layer);
// When the pending tree pushes to the active tree, the pending twin
// becomes recycled.
layer_impl->twin_layer_ = NULL;
twin_layer_ = NULL;
layer_impl->UpdatePile(pile_);
DCHECK(!pile_->is_solid_color() || !tilings_->num_tilings());
// Tilings would be expensive to push, so we swap.
layer_impl->tilings_.swap(tilings_);
layer_impl->tilings_->SetClient(layer_impl);
if (tilings_)
tilings_->SetClient(this);
// Ensure that the recycle tree doesn't have any unshared tiles.
if (tilings_ && pile_->is_solid_color())
tilings_->RemoveAllTilings();
// Remove invalidated tiles from what will become a recycle tree.
if (tilings_)
tilings_->RemoveTilesInRegion(invalidation_);
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->needs_post_commit_initialization_ = false;
// The invalidation on this soon-to-be-recycled layer must be cleared to
// mirror clearing the invalidation in PictureLayer's version of this function
// in case push properties is skipped.
layer_impl->invalidation_.Swap(&invalidation_);
invalidation_.Clear();
needs_post_commit_initialization_ = true;
// We always need to push properties.
// See http://crbug.com/303943
needs_push_properties_ = true;
}
void PictureLayerImpl::UpdatePile(scoped_refptr<PicturePileImpl> pile) {
bool could_have_tilings = CanHaveTilings();
pile_.swap(pile);
// Need to call UpdateTiles again if CanHaveTilings changed.
if (could_have_tilings != CanHaveTilings()) {
layer_tree_impl()->set_needs_update_draw_properties();
}
}
void PictureLayerImpl::AppendQuads(
RenderPass* render_pass,
const OcclusionTracker<LayerImpl>& occlusion_tracker,
AppendQuadsData* append_quads_data) {
DCHECK(!needs_post_commit_initialization_);
SharedQuadState* shared_quad_state =
render_pass->CreateAndAppendSharedQuadState();
if (pile_->is_solid_color()) {
PopulateSharedQuadState(shared_quad_state);
AppendDebugBorderQuad(
render_pass, content_bounds(), shared_quad_state, append_quads_data);
SolidColorLayerImpl::AppendSolidQuads(
render_pass,
occlusion_tracker,
shared_quad_state,
visible_content_rect(),
draw_properties().target_space_transform,
pile_->solid_color());
return;
}
float max_contents_scale = MaximumTilingContentsScale();
gfx::Transform scaled_draw_transform = draw_transform();
scaled_draw_transform.Scale(SK_MScalar1 / max_contents_scale,
SK_MScalar1 / max_contents_scale);
gfx::Size scaled_content_bounds =
gfx::ToCeiledSize(gfx::ScaleSize(content_bounds(), max_contents_scale));
gfx::Rect scaled_visible_content_rect =
gfx::ScaleToEnclosingRect(visible_content_rect(), max_contents_scale);
scaled_visible_content_rect.Intersect(gfx::Rect(scaled_content_bounds));
Occlusion occlusion =
occlusion_tracker.GetCurrentOcclusionForLayer(scaled_draw_transform);
shared_quad_state->SetAll(scaled_draw_transform,
scaled_content_bounds,
scaled_visible_content_rect,
draw_properties().clip_rect,
draw_properties().is_clipped,
draw_properties().opacity,
blend_mode(),
sorting_context_id_);
if (current_draw_mode_ == DRAW_MODE_RESOURCELESS_SOFTWARE) {
AppendDebugBorderQuad(
render_pass,
scaled_content_bounds,
shared_quad_state,
append_quads_data,
DebugColors::DirectPictureBorderColor(),
DebugColors::DirectPictureBorderWidth(layer_tree_impl()));
gfx::Rect geometry_rect = scaled_visible_content_rect;
gfx::Rect opaque_rect = contents_opaque() ? geometry_rect : gfx::Rect();
gfx::Rect visible_geometry_rect =
occlusion.GetUnoccludedContentRect(geometry_rect);
if (visible_geometry_rect.IsEmpty())
return;
gfx::Size texture_size = scaled_visible_content_rect.size();
gfx::RectF texture_rect = gfx::RectF(texture_size);
gfx::Rect quad_content_rect = scaled_visible_content_rect;
PictureDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<PictureDrawQuad>();
quad->SetNew(shared_quad_state,
geometry_rect,
opaque_rect,
visible_geometry_rect,
texture_rect,
texture_size,
RGBA_8888,
quad_content_rect,
max_contents_scale,
pile_);
return;
}
AppendDebugBorderQuad(
render_pass, scaled_content_bounds, shared_quad_state, append_quads_data);
if (ShowDebugBorders()) {
for (PictureLayerTilingSet::CoverageIterator iter(
tilings_.get(),
max_contents_scale,
scaled_visible_content_rect,
ideal_contents_scale_);
iter;
++iter) {
SkColor color;
float width;
if (*iter && iter->IsReadyToDraw()) {
ManagedTileState::TileVersion::Mode mode =
iter->GetTileVersionForDrawing().mode();
if (mode == ManagedTileState::TileVersion::SOLID_COLOR_MODE) {
color = DebugColors::SolidColorTileBorderColor();
width = DebugColors::SolidColorTileBorderWidth(layer_tree_impl());
} else if (mode == ManagedTileState::TileVersion::PICTURE_PILE_MODE) {
color = DebugColors::PictureTileBorderColor();
width = DebugColors::PictureTileBorderWidth(layer_tree_impl());
} else if (iter->priority(ACTIVE_TREE).resolution == HIGH_RESOLUTION) {
color = DebugColors::HighResTileBorderColor();
width = DebugColors::HighResTileBorderWidth(layer_tree_impl());
} else if (iter->priority(ACTIVE_TREE).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.
std::vector<PictureLayerTiling*> seen_tilings;
// 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 SetExternalDrawConstraints.
gfx::Rect scaled_viewport_for_tile_priority = gfx::ScaleToEnclosingRect(
GetViewportForTilePriorityInContentSpace(), max_contents_scale);
size_t missing_tile_count = 0u;
size_t on_demand_missing_tile_count = 0u;
for (PictureLayerTilingSet::CoverageIterator iter(tilings_.get(),
max_contents_scale,
scaled_visible_content_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 =
occlusion.GetUnoccludedContentRect(geometry_rect);
if (visible_geometry_rect.IsEmpty())
continue;
append_quads_data->visible_content_area +=
visible_geometry_rect.width() * visible_geometry_rect.height();
bool has_draw_quad = false;
if (*iter && iter->IsReadyToDraw()) {
const ManagedTileState::TileVersion& tile_version =
iter->GetTileVersionForDrawing();
switch (tile_version.mode()) {
case ManagedTileState::TileVersion::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,
tile_version.get_resource_id(),
texture_rect,
iter.texture_size(),
tile_version.contents_swizzled());
has_draw_quad = true;
break;
}
case ManagedTileState::TileVersion::PICTURE_PILE_MODE: {
if (!layer_tree_impl()
->GetRendererCapabilities()
.allow_rasterize_on_demand) {
++on_demand_missing_tile_count;
break;
}
gfx::RectF texture_rect = iter.texture_rect();
ResourceProvider* resource_provider =
layer_tree_impl()->resource_provider();
ResourceFormat format =
resource_provider->memory_efficient_texture_format();
PictureDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<PictureDrawQuad>();
quad->SetNew(shared_quad_state,
geometry_rect,
opaque_rect,
visible_geometry_rect,
texture_rect,
iter.texture_size(),
format,
iter->content_rect(),
iter->contents_scale(),
pile_);
has_draw_quad = true;
break;
}
case ManagedTileState::TileVersion::SOLID_COLOR_MODE: {
SolidColorDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
quad->SetNew(shared_quad_state,
geometry_rect,
visible_geometry_rect,
tile_version.get_solid_color(),
false);
has_draw_quad = true;
break;
}
}
}
if (!has_draw_quad) {
if (draw_checkerboard_for_missing_tiles()) {
CheckerboardDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<CheckerboardDrawQuad>();
SkColor color = DebugColors::DefaultCheckerboardColor();
quad->SetNew(
shared_quad_state, geometry_rect, visible_geometry_rect, color);
} else {
SkColor color = SafeOpaqueBackgroundColor();
SolidColorDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
quad->SetNew(shared_quad_state,
geometry_rect,
visible_geometry_rect,
color,
false);
}
if (geometry_rect.Intersects(scaled_viewport_for_tile_priority)) {
append_quads_data->num_missing_tiles++;
++missing_tile_count;
}
append_quads_data->approximated_visible_content_area +=
visible_geometry_rect.width() * visible_geometry_rect.height();
continue;
}
if (iter->priority(ACTIVE_TREE).resolution != HIGH_RESOLUTION) {
append_quads_data->approximated_visible_content_area +=
visible_geometry_rect.width() * visible_geometry_rect.height();
}
if (seen_tilings.empty() || seen_tilings.back() != iter.CurrentTiling())
seen_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_content_rect for the
// finer tilings.
CleanUpTilingsOnActiveLayer(seen_tilings);
}
void PictureLayerImpl::UpdateTiles(const Occlusion& occlusion_in_content_space,
bool resourceless_software_draw) {
TRACE_EVENT0("cc", "PictureLayerImpl::UpdateTiles");
DCHECK_EQ(1.f, contents_scale_x());
DCHECK_EQ(1.f, contents_scale_y());
DoPostCommitInitializationIfNeeded();
// Any draw properties derived from |transform|, |viewport|, and |clip|
// parameters in LayerTreeHostImpl::SetExternalDrawConstraints are not valid
// for prioritizing tiles during resourceless software draws. This is because
// resourceless software draws can have wildly different transforms/viewports
// from regular draws.
if (!resourceless_software_draw) {
visible_rect_for_tile_priority_ = visible_content_rect();
}
viewport_rect_for_tile_priority_ =
layer_tree_impl()->ViewportRectForTilePriority();
screen_space_transform_for_tile_priority_ = screen_space_transform();
if (!CanHaveTilings()) {
ideal_page_scale_ = 0.f;
ideal_device_scale_ = 0.f;
ideal_contents_scale_ = 0.f;
ideal_source_scale_ = 0.f;
SanityCheckTilingState();
return;
}
UpdateIdealScales();
DCHECK(tilings_->num_tilings() > 0 || raster_contents_scale_ == 0.f)
<< "A layer with no tilings shouldn't have valid raster scales";
if (!raster_contents_scale_ || ShouldAdjustRasterScale()) {
RecalculateRasterScales();
AddTilingsForRasterScale();
}
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;
should_update_tile_priorities_ = true;
UpdateTilePriorities(occlusion_in_content_space);
if (layer_tree_impl()->IsPendingTree())
MarkVisibleResourcesAsRequired();
}
void PictureLayerImpl::UpdateTilePriorities(
const Occlusion& occlusion_in_content_space) {
DCHECK(!pile_->is_solid_color() || !tilings_->num_tilings());
TRACE_EVENT0("cc", "PictureLayerImpl::UpdateTilePriorities");
double current_frame_time_in_seconds =
(layer_tree_impl()->CurrentBeginFrameArgs().frame_time -
base::TimeTicks()).InSecondsF();
gfx::Rect viewport_rect_in_layer_space =
GetViewportForTilePriorityInContentSpace();
bool tiling_needs_update = false;
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
if (tilings_->tiling_at(i)->NeedsUpdateForFrameAtTimeAndViewport(
current_frame_time_in_seconds, viewport_rect_in_layer_space)) {
tiling_needs_update = true;
break;
}
}
if (!tiling_needs_update)
return;
WhichTree tree =
layer_tree_impl()->IsActiveTree() ? ACTIVE_TREE : PENDING_TREE;
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
// Pass |occlusion_in_content_space| for |occlusion_in_layer_space| since
// they are the same space in picture lbayer, as contents scale is always 1.
tilings_->tiling_at(i)->UpdateTilePriorities(tree,
viewport_rect_in_layer_space,
ideal_contents_scale_,
current_frame_time_in_seconds,
occlusion_in_content_space);
}
// Tile priorities were modified.
layer_tree_impl()->DidModifyTilePriorities();
}
gfx::Rect PictureLayerImpl::GetViewportForTilePriorityInContentSpace() const {
// If visible_rect_for_tile_priority_ 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_rect_for_tile_priority_
gfx::Rect visible_rect_in_content_space = visible_rect_for_tile_priority_;
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 (screen_space_transform_for_tile_priority_.GetInverse(&view_to_layer)) {
// Transform from view space to content space.
visible_rect_in_content_space =
gfx::ToEnclosingRect(MathUtil::ProjectClippedRect(
view_to_layer, viewport_rect_for_tile_priority_));
}
}
return visible_rect_in_content_space;
}
PictureLayerImpl* PictureLayerImpl::GetRecycledTwinLayer() {
// TODO(vmpstr): Maintain recycled twin as a member. crbug.com/407418
return static_cast<PictureLayerImpl*>(
layer_tree_impl()->FindRecycleTreeLayerById(id()));
}
void PictureLayerImpl::NotifyTileStateChanged(const Tile* tile) {
if (layer_tree_impl()->IsActiveTree()) {
gfx::RectF layer_damage_rect =
gfx::ScaleRect(tile->content_rect(), 1.f / tile->contents_scale());
AddDamageRect(layer_damage_rect);
}
}
void PictureLayerImpl::DidBecomeActive() {
LayerImpl::DidBecomeActive();
tilings_->DidBecomeActive();
layer_tree_impl()->DidModifyTilePriorities();
}
void PictureLayerImpl::DidBeginTracing() {
pile_->DidBeginTracing();
}
void PictureLayerImpl::ReleaseResources() {
if (tilings_)
RemoveAllTilings();
ResetRasterScale();
// 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 pile_->GetFlattenedPicture();
}
scoped_refptr<Tile> PictureLayerImpl::CreateTile(PictureLayerTiling* tiling,
const gfx::Rect& content_rect) {
DCHECK(!pile_->is_solid_color());
if (!pile_->CanRaster(tiling->contents_scale(), content_rect))
return scoped_refptr<Tile>();
int flags = 0;
// TODO(vmpstr): Revisit this. For now, enabling analysis means that we get as
// much savings on memory as we can. However, for some cases like ganesh or
// small layers, the amount of time we spend analyzing might not justify
// memory savings that we can get. Note that we don't handle solid color
// masks, so we shouldn't bother analyzing those.
// Bugs: crbug.com/397198, crbug.com/396908
if (!pile_->is_mask())
flags = Tile::USE_PICTURE_ANALYSIS;
return layer_tree_impl()->tile_manager()->CreateTile(
pile_.get(),
content_rect.size(),
content_rect,
tiling->contents_scale(),
id(),
layer_tree_impl()->source_frame_number(),
flags);
}
PicturePileImpl* PictureLayerImpl::GetPile() {
return pile_.get();
}
const Region* PictureLayerImpl::GetInvalidation() {
return &invalidation_;
}
const PictureLayerTiling* PictureLayerImpl::GetTwinTiling(
const PictureLayerTiling* tiling) const {
if (!twin_layer_)
return NULL;
return twin_layer_->tilings_->TilingAtScale(tiling->contents_scale());
}
PictureLayerTiling* PictureLayerImpl::GetRecycledTwinTiling(
const PictureLayerTiling* tiling) {
PictureLayerImpl* recycled_twin = GetRecycledTwinLayer();
if (!recycled_twin || !recycled_twin->tilings_)
return NULL;
return recycled_twin->tilings_->TilingAtScale(tiling->contents_scale());
}
size_t PictureLayerImpl::GetMaxTilesForInterestArea() const {
return layer_tree_impl()->settings().max_tiles_for_interest_area;
}
float PictureLayerImpl::GetSkewportTargetTimeInSeconds() const {
float skewport_target_time_in_frames =
layer_tree_impl()->use_gpu_rasterization()
? kGpuSkewportTargetTimeInFrames
: kCpuSkewportTargetTimeInFrames;
return skewport_target_time_in_frames *
layer_tree_impl()->begin_impl_frame_interval().InSecondsF() *
layer_tree_impl()->settings().skewport_target_time_multiplier;
}
int PictureLayerImpl::GetSkewportExtrapolationLimitInContentPixels() const {
return layer_tree_impl()
->settings()
.skewport_extrapolation_limit_in_content_pixels;
}
gfx::Size PictureLayerImpl::CalculateTileSize(
const gfx::Size& content_bounds) const {
int max_texture_size =
layer_tree_impl()->resource_provider()->max_texture_size();
if (pile_->is_mask()) {
// Masks are not tiled, so if we can't cover the whole mask with one tile,
// don't make any tiles at all. Returning an empty size signals this.
if (content_bounds.width() > max_texture_size ||
content_bounds.height() > max_texture_size)
return gfx::Size();
return content_bounds;
}
gfx::Size default_tile_size = layer_tree_impl()->settings().default_tile_size;
if (layer_tree_impl()->use_gpu_rasterization()) {
// TODO(ernstm) crbug.com/365877: We need a unified way to override the
// default-tile-size.
default_tile_size =
gfx::Size(layer_tree_impl()->device_viewport_size().width(),
layer_tree_impl()->device_viewport_size().height() / 4);
}
default_tile_size.SetToMin(gfx::Size(max_texture_size, max_texture_size));
gfx::Size max_untiled_content_size =
layer_tree_impl()->settings().max_untiled_layer_size;
max_untiled_content_size.SetToMin(
gfx::Size(max_texture_size, max_texture_size));
bool any_dimension_too_large =
content_bounds.width() > max_untiled_content_size.width() ||
content_bounds.height() > max_untiled_content_size.height();
bool any_dimension_one_tile =
content_bounds.width() <= default_tile_size.width() ||
content_bounds.height() <= default_tile_size.height();
// If long and skinny, tile at the max untiled content size, and clamp
// the smaller dimension to the content size, e.g. 1000x12 layer with
// 500x500 max untiled size would get 500x12 tiles. Also do this
// if the layer is small.
if (any_dimension_one_tile || !any_dimension_too_large) {
int width = std::min(
std::max(max_untiled_content_size.width(), default_tile_size.width()),
content_bounds.width());
int height = std::min(
std::max(max_untiled_content_size.height(), default_tile_size.height()),
content_bounds.height());
// Round up to the closest multiple of 64. This improves recycling and
// avoids odd texture sizes.
width = RoundUp(width, 64);
height = RoundUp(height, 64);
return gfx::Size(width, height);
}
return default_tile_size;
}
void PictureLayerImpl::SyncFromActiveLayer(const PictureLayerImpl* other) {
TRACE_EVENT0("cc", "SyncFromActiveLayer");
DCHECK(!other->needs_post_commit_initialization_);
DCHECK(other->tilings_);
if (!DrawsContent()) {
RemoveAllTilings();
return;
}
raster_page_scale_ = other->raster_page_scale_;
raster_device_scale_ = other->raster_device_scale_;
raster_source_scale_ = other->raster_source_scale_;
raster_contents_scale_ = other->raster_contents_scale_;
low_res_raster_contents_scale_ = other->low_res_raster_contents_scale_;
bool synced_high_res_tiling = false;
if (CanHaveTilings()) {
synced_high_res_tiling = tilings_->SyncTilings(
*other->tilings_, bounds(), invalidation_, MinimumContentsScale());
} else {
RemoveAllTilings();
}
// If our MinimumContentsScale has changed to prevent the twin's high res
// tiling from being synced, we should reset the raster scale and let it be
// recalculated (1) again. This can happen if our bounds shrink to the point
// where min contents scale grows.
// (1) - TODO(vmpstr) Instead of hoping that this will be recalculated, we
// should refactor this code a little bit and actually recalculate this.
// However, this is a larger undertaking, so this will work for now.
if (!synced_high_res_tiling)
ResetRasterScale();
else
SanityCheckTilingState();
}
void PictureLayerImpl::SyncTiling(
const PictureLayerTiling* tiling) {
if (!CanHaveTilingWithScale(tiling->contents_scale()))
return;
tilings_->AddTiling(tiling->contents_scale());
// If this tree needs update draw properties, then the tiling will
// get updated prior to drawing or activation. If this tree does not
// need update draw properties, then its transforms are up to date and
// we can create tiles for this tiling immediately.
if (!layer_tree_impl()->needs_update_draw_properties() &&
should_update_tile_priorities_) {
// TODO(danakj): Add a DCHECK() that we are not using occlusion tracking
// when we stop using the pending tree in the browser compositor. If we want
// to support occlusion tracking here, we need to dirty the draw properties
// or save occlusion as a draw property.
UpdateTilePriorities(Occlusion());
}
}
ResourceProvider::ResourceId PictureLayerImpl::ContentsResourceId() const {
gfx::Rect content_rect(content_bounds());
PictureLayerTilingSet::CoverageIterator iter(
tilings_.get(), 1.f, content_rect, ideal_contents_scale_);
// Mask resource not ready yet.
if (!iter || !*iter)
return 0;
// 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 ManagedTileState::TileVersion& tile_version =
iter->GetTileVersionForDrawing();
if (!tile_version.IsReadyToDraw() ||
tile_version.mode() != ManagedTileState::TileVersion::RESOURCE_MODE)
return 0;
return tile_version.get_resource_id();
}
void PictureLayerImpl::MarkVisibleResourcesAsRequired() const {
DCHECK(layer_tree_impl()->IsPendingTree());
DCHECK(ideal_contents_scale_);
DCHECK_GT(tilings_->num_tilings(), 0u);
// The goal of this function is to find the minimum set of tiles that need to
// be ready to draw in order to activate without flashing content from a
// higher res on the active tree to a lower res on the pending tree.
// First, early out for layers with no visible content.
if (visible_rect_for_tile_priority_.IsEmpty())
return;
// Only mark tiles inside the viewport for tile priority as required for
// activation. This viewport is normally the same as the draw viewport but
// can be independently overridden by embedders like Android WebView with
// SetExternalDrawConstraints.
gfx::Rect rect = GetViewportForTilePriorityInContentSpace();
rect.Intersect(visible_rect_for_tile_priority_);
float min_acceptable_scale =
std::min(raster_contents_scale_, ideal_contents_scale_);
if (PictureLayerImpl* twin = twin_layer_) {
float twin_min_acceptable_scale =
std::min(twin->ideal_contents_scale_, twin->raster_contents_scale_);
// Ignore 0 scale in case CalculateContentsScale() has never been
// called for active twin.
if (twin_min_acceptable_scale != 0.0f) {
min_acceptable_scale =
std::min(min_acceptable_scale, twin_min_acceptable_scale);
}
}
PictureLayerTiling* high_res = NULL;
PictureLayerTiling* low_res = NULL;
// First pass: ready to draw tiles in acceptable but non-ideal tilings are
// marked as required for activation so that their textures are not thrown
// away; any non-ready tiles are not marked as required.
Region missing_region = rect;
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
PictureLayerTiling* tiling = tilings_->tiling_at(i);
DCHECK(tiling->has_ever_been_updated());
if (tiling->resolution() == LOW_RESOLUTION) {
DCHECK(!low_res) << "There can only be one low res tiling";
low_res = tiling;
}
if (tiling->contents_scale() < min_acceptable_scale)
continue;
if (tiling->resolution() == HIGH_RESOLUTION) {
DCHECK(!high_res) << "There can only be one high res tiling";
high_res = tiling;
continue;
}
for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f, rect); iter;
++iter) {
if (!*iter || !iter->IsReadyToDraw())
continue;
missing_region.Subtract(iter.geometry_rect());
iter->MarkRequiredForActivation();
}
}
DCHECK(high_res) << "There must be one high res tiling";
// If these pointers are null (because no twin, no matching tiling, or the
// simpification just below), then high res tiles will be required to fill any
// holes left by the first pass above. If the pointers are valid, then this
// layer is allowed to skip any tiles that are not ready on its twin.
const PictureLayerTiling* twin_high_res = NULL;
const PictureLayerTiling* twin_low_res = NULL;
if (twin_layer_) {
// As a simplification, only allow activating to skip twin tiles that the
// active layer is also missing when both this layer and its twin have
// "simple" sets of tilings: only 2 tilings (high and low) or only 1 high
// res tiling. This avoids having to iterate/track coverage of non-ideal
// tilings during the last draw call on the active layer.
if (tilings_->num_tilings() <= 2 &&
twin_layer_->tilings_->num_tilings() <= tilings_->num_tilings()) {
twin_low_res = low_res ? GetTwinTiling(low_res) : NULL;
twin_high_res = high_res ? GetTwinTiling(high_res) : NULL;
}
// If this layer and its twin have different transforms, then don't compare
// them and only allow activating to high res tiles, since tiles on each
// layer will be in different places on screen.
if (twin_layer_->layer_tree_impl()->RequiresHighResToDraw() ||
bounds() != twin_layer_->bounds() ||
draw_properties().screen_space_transform !=
twin_layer_->draw_properties().screen_space_transform) {
twin_high_res = NULL;
twin_low_res = NULL;
}
}
// As a second pass, mark as required any visible high res tiles not filled in
// by acceptable non-ideal tiles from the first pass.
if (MarkVisibleTilesAsRequired(
high_res, twin_high_res, rect, missing_region)) {
// As an optional third pass, if a high res tile was skipped because its
// twin was also missing, then fall back to mark low res tiles as required
// in case the active twin is substituting those for missing high res
// content. Only suitable, when low res is enabled.
if (low_res) {
MarkVisibleTilesAsRequired(low_res, twin_low_res, rect, missing_region);
}
}
}
bool PictureLayerImpl::MarkVisibleTilesAsRequired(
PictureLayerTiling* tiling,
const PictureLayerTiling* optional_twin_tiling,
const gfx::Rect& rect,
const Region& missing_region) const {
bool twin_had_missing_tile = false;
for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f, rect); iter;
++iter) {
Tile* tile = *iter;
// A null tile (i.e. missing recording) can just be skipped.
if (!tile)
continue;
// If the tile is occluded, don't mark it as required for activation.
if (tile->is_occluded(PENDING_TREE))
continue;
// If the missing region doesn't cover it, this tile is fully
// covered by acceptable tiles at other scales.
if (!missing_region.Intersects(iter.geometry_rect()))
continue;
// If the twin tile doesn't exist (i.e. missing recording or so far away
// that it is outside the visible tile rect) or this tile is shared between
// with the twin, then this tile isn't required to prevent flashing.
if (optional_twin_tiling) {
Tile* twin_tile = optional_twin_tiling->TileAt(iter.i(), iter.j());
if (!twin_tile || twin_tile == tile) {
// However if the shared tile is being used on the active tree, then
// there's no missing content in this place, and low res is not needed.
if (!twin_tile || !twin_tile->IsReadyToDraw())
twin_had_missing_tile = true;
continue;
}
}
tile->MarkRequiredForActivation();
}
return twin_had_missing_tile;
}
void PictureLayerImpl::DoPostCommitInitialization() {
DCHECK(needs_post_commit_initialization_);
DCHECK(layer_tree_impl()->IsPendingTree());
if (!tilings_)
tilings_.reset(new PictureLayerTilingSet(this, bounds()));
DCHECK(!twin_layer_);
twin_layer_ = static_cast<PictureLayerImpl*>(
layer_tree_impl()->FindActiveTreeLayerById(id()));
if (twin_layer_) {
DCHECK(!twin_layer_->twin_layer_);
twin_layer_->twin_layer_ = this;
// If the twin has never been pushed to, do not sync from it.
// This can happen if this function is called during activation.
if (!twin_layer_->needs_post_commit_initialization_)
SyncFromActiveLayer(twin_layer_);
}
needs_post_commit_initialization_ = false;
}
PictureLayerTiling* PictureLayerImpl::AddTiling(float contents_scale) {
DCHECK(CanHaveTilingWithScale(contents_scale)) <<
"contents_scale: " << contents_scale;
PictureLayerTiling* tiling = tilings_->AddTiling(contents_scale);
DCHECK(pile_->HasRecordings());
if (twin_layer_)
twin_layer_->SyncTiling(tiling);
return tiling;
}
void PictureLayerImpl::RemoveTiling(float contents_scale) {
if (!tilings_ || tilings_->num_tilings() == 0)
return;
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
PictureLayerTiling* tiling = tilings_->tiling_at(i);
if (tiling->contents_scale() == contents_scale) {
tilings_->Remove(tiling);
break;
}
}
if (tilings_->num_tilings() == 0)
ResetRasterScale();
SanityCheckTilingState();
}
void PictureLayerImpl::RemoveAllTilings() {
if (tilings_)
tilings_->RemoveAllTilings();
// If there are no tilings, then raster scales are no longer meaningful.
ResetRasterScale();
}
namespace {
inline float PositiveRatio(float float1, float float2) {
DCHECK_GT(float1, 0);
DCHECK_GT(float2, 0);
return float1 > float2 ? float1 / float2 : float2 / float1;
}
} // namespace
void PictureLayerImpl::AddTilingsForRasterScale() {
PictureLayerTiling* high_res = NULL;
PictureLayerTiling* low_res = NULL;
PictureLayerTiling* previous_low_res = NULL;
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
PictureLayerTiling* tiling = tilings_->tiling_at(i);
if (tiling->contents_scale() == raster_contents_scale_)
high_res = tiling;
if (tiling->contents_scale() == low_res_raster_contents_scale_)
low_res = tiling;
if (tiling->resolution() == LOW_RESOLUTION)
previous_low_res = tiling;
// Reset all tilings to non-ideal until the end of this function.
tiling->set_resolution(NON_IDEAL_RESOLUTION);
}
if (!high_res) {
high_res = AddTiling(raster_contents_scale_);
if (raster_contents_scale_ == low_res_raster_contents_scale_)
low_res = high_res;
}
// 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();
if (layer_tree_impl()->create_low_res_tiling() && !is_pinching &&
!draw_properties().screen_space_transform_is_animating && !low_res &&
low_res != high_res)
low_res = AddTiling(low_res_raster_contents_scale_);
// Set low-res if we have one.
if (!low_res)
low_res = previous_low_res;
if (low_res && low_res != high_res)
low_res->set_resolution(LOW_RESOLUTION);
// Make sure we always have one high-res (even if high == low).
high_res->set_resolution(HIGH_RESOLUTION);
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
// or when we've fixed the scale in place.
if (!draw_properties().screen_space_transform_is_animating &&
!raster_source_scale_is_fixed_ &&
raster_source_scale_ != ideal_source_scale_)
return true;
return false;
}
float PictureLayerImpl::SnappedContentsScale(float scale) {
// If a tiling exists within the max snapping ratio, snap to its scale.
float snapped_contents_scale = scale;
float snapped_ratio = kSnapToExistingTilingRatio;
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
float tiling_contents_scale = tilings_->tiling_at(i)->contents_scale();
float ratio = PositiveRatio(tiling_contents_scale, scale);
if (ratio < snapped_ratio) {
snapped_contents_scale = tiling_contents_scale;
snapped_ratio = ratio;
}
}
return snapped_contents_scale;
}
void PictureLayerImpl::RecalculateRasterScales() {
float old_raster_contents_scale = raster_contents_scale_;
float old_raster_page_scale = raster_page_scale_;
float old_raster_source_scale = raster_source_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_;
// If we're not animating, or leaving an animation, and the
// ideal_source_scale_ changes, then things are unpredictable, and we fix
// the raster_source_scale_ in place.
if (old_raster_source_scale &&
!draw_properties().screen_space_transform_is_animating &&
!was_screen_space_transform_animating_ &&
old_raster_source_scale != ideal_source_scale_)
raster_source_scale_is_fixed_ = true;
// TODO(danakj): Adjust raster source scale closer to ideal source scale at
// a throttled rate. Possibly make use of invalidation_.IsEmpty() on pending
// tree. This will allow CSS scale changes to get re-rastered at an
// appropriate rate. (crbug.com/413636)
if (raster_source_scale_is_fixed_) {
raster_contents_scale_ /= raster_source_scale_;
raster_source_scale_ = 1.f;
}
// During pinch we completely ignore the current ideal scale, and just use
// a multiple of the previous scale.
// TODO(danakj): This seems crazy, we should use the current ideal, no?
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 =
zooming_out ? old_raster_contents_scale / kMaxScaleRatioDuringPinch
: old_raster_contents_scale * kMaxScaleRatioDuringPinch;
raster_contents_scale_ = SnappedContentsScale(desired_contents_scale);
raster_page_scale_ =
raster_contents_scale_ / raster_device_scale_ / raster_source_scale_;
}
raster_contents_scale_ =
std::max(raster_contents_scale_, MinimumContentsScale());
// 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;
// TODO(ajuma): If we need to deal with scale-down animations starting right
// as a layer gets promoted, then we'd want to have the
// |starting_animation_contents_scale| passed in here as a separate draw
// property so we could try use that when the max is too large.
// See crbug.com/422341.
float maximum_scale = draw_properties().maximum_animation_contents_scale;
if (maximum_scale) {
gfx::Size bounds_at_maximum_scale =
gfx::ToCeiledSize(gfx::ScaleSize(bounds(), maximum_scale));
if (bounds_at_maximum_scale.GetArea() <=
layer_tree_impl()->device_viewport_size().GetArea())
can_raster_at_maximum_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 (can_raster_at_maximum_scale)
raster_contents_scale_ = maximum_scale;
else
raster_contents_scale_ = 1.f * ideal_page_scale_ * ideal_device_scale_;
}
// If this layer would create zero or one tiles at this content scale,
// don't create a low res tiling.
gfx::Size content_bounds =
gfx::ToCeiledSize(gfx::ScaleSize(bounds(), raster_contents_scale_));
gfx::Size tile_size = CalculateTileSize(content_bounds);
bool tile_covers_bounds = tile_size.width() >= content_bounds.width() &&
tile_size.height() >= content_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());
}
void PictureLayerImpl::CleanUpTilingsOnActiveLayer(
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_);
float twin_low_res_scale = 0.f;
PictureLayerImpl* twin = twin_layer_;
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_));
for (size_t i = 0; i < twin->tilings_->num_tilings(); ++i) {
PictureLayerTiling* tiling = twin->tilings_->tiling_at(i);
if (tiling->resolution() == LOW_RESOLUTION)
twin_low_res_scale = tiling->contents_scale();
}
}
std::vector<PictureLayerTiling*> to_remove;
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
PictureLayerTiling* tiling = tilings_->tiling_at(i);
// Keep multiple high resolution tilings even if not used to help
// activate earlier at non-ideal resolutions.
if (tiling->contents_scale() >= min_acceptable_high_res_scale &&
tiling->contents_scale() <= max_acceptable_high_res_scale)
continue;
// Keep low resolution tilings, if the layer should have them.
if (layer_tree_impl()->create_low_res_tiling()) {
if (tiling->resolution() == LOW_RESOLUTION ||
tiling->contents_scale() == twin_low_res_scale)
continue;
}
// Don't remove tilings that are being used (and thus would cause a flash.)
if (std::find(used_tilings.begin(), used_tilings.end(), tiling) !=
used_tilings.end())
continue;
to_remove.push_back(tiling);
}
if (to_remove.empty())
return;
PictureLayerImpl* recycled_twin = GetRecycledTwinLayer();
// Remove tilings on this tree and the twin tree.
for (size_t i = 0; i < to_remove.size(); ++i) {
const PictureLayerTiling* twin_tiling = GetTwinTiling(to_remove[i]);
// Only remove tilings from the twin layer if they have
// NON_IDEAL_RESOLUTION.
if (twin_tiling && twin_tiling->resolution() == NON_IDEAL_RESOLUTION)
twin->RemoveTiling(to_remove[i]->contents_scale());
// Remove the tiling from the recycle tree. Note that we ignore resolution,
// since we don't need to maintain high/low res on the recycle tree.
if (recycled_twin)
recycled_twin->RemoveTiling(to_remove[i]->contents_scale());
// TODO(enne): temporary sanity CHECK for http://crbug.com/358350
CHECK_NE(HIGH_RESOLUTION, to_remove[i]->resolution());
tilings_->Remove(to_remove[i]);
}
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(bounds().width(), bounds().height());
if (!min_dimension)
return setting_min;
return std::max(1.f / min_dimension, setting_min);
}
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;
raster_source_scale_is_fixed_ = false;
// When raster scales aren't valid, don't update tile priorities until
// this layer has been updated via UpdateDrawProperties.
should_update_tile_priorities_ = false;
}
bool PictureLayerImpl::CanHaveTilings() const {
if (pile_->is_solid_color())
return false;
if (!DrawsContent())
return false;
if (!pile_->HasRecordings())
return false;
return true;
}
bool PictureLayerImpl::CanHaveTilingWithScale(float contents_scale) const {
if (!CanHaveTilings())
return false;
if (contents_scale < MinimumContentsScale())
return false;
return true;
}
void PictureLayerImpl::SanityCheckTilingState() const {
#if DCHECK_IS_ON
// Recycle tree doesn't have any restrictions.
if (layer_tree_impl()->IsRecycleTree())
return;
if (!CanHaveTilings()) {
DCHECK_EQ(0u, tilings_->num_tilings());
return;
}
if (tilings_->num_tilings() == 0)
return;
// MarkVisibleResourcesAsRequired depends on having exactly 1 high res
// tiling to mark its tiles as being required for activation.
DCHECK_EQ(1, tilings_->NumHighResTilings());
#endif
}
bool PictureLayerImpl::ShouldAdjustRasterScaleDuringScaleAnimations() const {
if (!layer_tree_impl()->use_gpu_rasterization())
return false;
// Re-rastering text at different scales using GPU rasterization causes
// texture uploads for glyphs at each scale (see crbug.com/366225). To
// workaround this performance issue, we don't re-rasterize layers with
// text during scale animations.
// TODO(ajuma): Remove this workaround once text can be efficiently
// re-rastered at different scales (e.g. by using distance-field fonts).
if (pile_->has_text())
return false;
return true;
}
float PictureLayerImpl::MaximumTilingContentsScale() const {
float max_contents_scale = MinimumContentsScale();
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
const PictureLayerTiling* tiling = tilings_->tiling_at(i);
max_contents_scale = std::max(max_contents_scale, tiling->contents_scale());
}
return max_contents_scale;
}
void PictureLayerImpl::UpdateIdealScales() {
DCHECK(CanHaveTilings());
float min_contents_scale = MinimumContentsScale();
DCHECK_GT(min_contents_scale, 0.f);
float min_page_scale = layer_tree_impl()->min_page_scale_factor();
DCHECK_GT(min_page_scale, 0.f);
float min_device_scale = 1.f;
float min_source_scale =
min_contents_scale / min_page_scale / min_device_scale;
float ideal_page_scale = draw_properties().page_scale_factor;
float ideal_device_scale = draw_properties().device_scale_factor;
float ideal_source_scale = draw_properties().ideal_contents_scale /
ideal_page_scale / ideal_device_scale;
ideal_contents_scale_ =
std::max(draw_properties().ideal_contents_scale, min_contents_scale);
ideal_page_scale_ = draw_properties().page_scale_factor;
ideal_device_scale_ = draw_properties().device_scale_factor;
ideal_source_scale_ = std::max(ideal_source_scale, min_source_scale);
}
void PictureLayerImpl::GetDebugBorderProperties(
SkColor* color,
float* width) const {
*color = DebugColors::TiledContentLayerBorderColor();
*width = DebugColors::TiledContentLayerBorderWidth(layer_tree_impl());
}
void PictureLayerImpl::GetAllTilesForTracing(
std::set<const Tile*>* tiles) const {
if (!tilings_)
return;
for (size_t i = 0; i < tilings_->num_tilings(); ++i)
tilings_->tiling_at(i)->GetAllTilesForTracing(tiles);
}
void PictureLayerImpl::AsValueInto(base::debug::TracedValue* state) const {
const_cast<PictureLayerImpl*>(this)->DoPostCommitInitializationIfNeeded();
LayerImpl::AsValueInto(state);
state->SetDouble("ideal_contents_scale", ideal_contents_scale_);
state->SetDouble("geometry_contents_scale", MaximumTilingContentsScale());
state->BeginArray("tilings");
tilings_->AsValueInto(state);
state->EndArray();
state->BeginArray("tile_priority_rect");
MathUtil::AddToTracedValue(GetViewportForTilePriorityInContentSpace(), state);
state->EndArray();
state->BeginArray("visible_rect");
MathUtil::AddToTracedValue(visible_content_rect(), state);
state->EndArray();
state->BeginArray("pictures");
pile_->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(content_bounds()),
ideal_contents_scale_);
iter;
++iter) {
state->BeginDictionary();
state->BeginArray("geometry_rect");
MathUtil::AddToTracedValue(iter.geometry_rect(), state);
state->EndArray();
if (*iter)
TracedValue::SetIDRef(*iter, state, "tile");
state->EndDictionary();
}
state->EndArray();
}
size_t PictureLayerImpl::GPUMemoryUsageInBytes() const {
const_cast<PictureLayerImpl*>(this)->DoPostCommitInitializationIfNeeded();
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();
}
bool PictureLayerImpl::AllTilesRequiredForActivationAreReadyToDraw() const {
if (!layer_tree_impl()->IsPendingTree())
return true;
if (!HasValidTilePriorities())
return true;
if (!tilings_)
return true;
if (visible_rect_for_tile_priority_.IsEmpty())
return true;
gfx::Rect rect = GetViewportForTilePriorityInContentSpace();
rect.Intersect(visible_rect_for_tile_priority_);
for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
PictureLayerTiling* tiling = tilings_->tiling_at(i);
if (tiling->resolution() != HIGH_RESOLUTION &&
tiling->resolution() != LOW_RESOLUTION)
continue;
for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f, rect); iter;
++iter) {
const Tile* tile = *iter;
// A null tile (i.e. missing recording) can just be skipped.
if (!tile)
continue;
if (tile->required_for_activation() && !tile->IsReadyToDraw())
return false;
}
}
return true;
}
PictureLayerImpl::LayerRasterTileIterator::LayerRasterTileIterator()
: layer_(NULL), current_stage_(arraysize(stages_)) {
}
PictureLayerImpl::LayerRasterTileIterator::LayerRasterTileIterator(
PictureLayerImpl* layer,
bool prioritize_low_res)
: layer_(layer), current_stage_(0) {
DCHECK(layer_);
// Early out if the layer has no tilings.
if (!layer_->tilings_ || !layer_->tilings_->num_tilings()) {
current_stage_ = arraysize(stages_);
return;
}
// Tiles without valid priority are treated as having lowest priority and
// never considered for raster.
if (!layer_->HasValidTilePriorities()) {
current_stage_ = arraysize(stages_);
return;
}
WhichTree tree = layer_->GetTree();
// Find high and low res tilings and initialize the iterators.
for (size_t i = 0; i < layer_->tilings_->num_tilings(); ++i) {
PictureLayerTiling* tiling = layer_->tilings_->tiling_at(i);
if (tiling->resolution() == HIGH_RESOLUTION) {
iterators_[HIGH_RES] =
PictureLayerTiling::TilingRasterTileIterator(tiling, tree);
}
if (tiling->resolution() == LOW_RESOLUTION) {
iterators_[LOW_RES] =
PictureLayerTiling::TilingRasterTileIterator(tiling, tree);
}
}
if (prioritize_low_res) {
stages_[0].iterator_type = LOW_RES;
stages_[0].tile_type = TilePriority::NOW;
stages_[1].iterator_type = HIGH_RES;
stages_[1].tile_type = TilePriority::NOW;
} else {
stages_[0].iterator_type = HIGH_RES;
stages_[0].tile_type = TilePriority::NOW;
stages_[1].iterator_type = LOW_RES;
stages_[1].tile_type = TilePriority::NOW;
}
stages_[2].iterator_type = HIGH_RES;
stages_[2].tile_type = TilePriority::SOON;
stages_[3].iterator_type = HIGH_RES;
stages_[3].tile_type = TilePriority::EVENTUALLY;
IteratorType index = stages_[current_stage_].iterator_type;
TilePriority::PriorityBin tile_type = stages_[current_stage_].tile_type;
if (!iterators_[index] || iterators_[index].get_type() != tile_type)
AdvanceToNextStage();
}
PictureLayerImpl::LayerRasterTileIterator::~LayerRasterTileIterator() {}
PictureLayerImpl::LayerRasterTileIterator::operator bool() const {
return current_stage_ < arraysize(stages_);
}
PictureLayerImpl::LayerRasterTileIterator&
PictureLayerImpl::LayerRasterTileIterator::
operator++() {
IteratorType index = stages_[current_stage_].iterator_type;
TilePriority::PriorityBin tile_type = stages_[current_stage_].tile_type;
// First advance the iterator.
DCHECK(iterators_[index]);
DCHECK(iterators_[index].get_type() == tile_type);
++iterators_[index];
if (!iterators_[index] || iterators_[index].get_type() != tile_type)
AdvanceToNextStage();
return *this;
}
Tile* PictureLayerImpl::LayerRasterTileIterator::operator*() {
DCHECK(*this);
IteratorType index = stages_[current_stage_].iterator_type;
DCHECK(iterators_[index]);
DCHECK(iterators_[index].get_type() == stages_[current_stage_].tile_type);
return *iterators_[index];
}
const Tile* PictureLayerImpl::LayerRasterTileIterator::operator*() const {
DCHECK(*this);
IteratorType index = stages_[current_stage_].iterator_type;
DCHECK(iterators_[index]);
DCHECK(iterators_[index].get_type() == stages_[current_stage_].tile_type);
return *iterators_[index];
}
void PictureLayerImpl::LayerRasterTileIterator::AdvanceToNextStage() {
DCHECK_LT(current_stage_, arraysize(stages_));
++current_stage_;
while (current_stage_ < arraysize(stages_)) {
IteratorType index = stages_[current_stage_].iterator_type;
TilePriority::PriorityBin tile_type = stages_[current_stage_].tile_type;
if (iterators_[index] && iterators_[index].get_type() == tile_type)
break;
++current_stage_;
}
}
PictureLayerImpl::LayerEvictionTileIterator::LayerEvictionTileIterator()
: layer_(NULL),
tree_priority_(SAME_PRIORITY_FOR_BOTH_TREES),
current_category_(PictureLayerTiling::EVENTUALLY),
current_tiling_range_type_(PictureLayerTilingSet::HIGHER_THAN_HIGH_RES),
current_tiling_(0u) {
}
PictureLayerImpl::LayerEvictionTileIterator::LayerEvictionTileIterator(
PictureLayerImpl* layer,
TreePriority tree_priority)
: layer_(layer),
tree_priority_(tree_priority),
current_category_(PictureLayerTiling::EVENTUALLY),
current_tiling_range_type_(PictureLayerTilingSet::HIGHER_THAN_HIGH_RES),
current_tiling_(CurrentTilingRange().start - 1u) {
// TODO(vmpstr): Once tile priorities are determined by the iterators, ensure
// that layers that don't have valid tile priorities have lowest priorities so
// they evict their tiles first (crbug.com/381704)
DCHECK(layer_->tilings_);
do {
if (!AdvanceToNextTiling())
break;
current_iterator_ = PictureLayerTiling::TilingEvictionTileIterator(
layer_->tilings_->tiling_at(CurrentTilingIndex()),
tree_priority,
current_category_);
} while (!current_iterator_);
}
PictureLayerImpl::LayerEvictionTileIterator::~LayerEvictionTileIterator() {
}
Tile* PictureLayerImpl::LayerEvictionTileIterator::operator*() {
DCHECK(*this);
return *current_iterator_;
}
const Tile* PictureLayerImpl::LayerEvictionTileIterator::operator*() const {
DCHECK(*this);
return *current_iterator_;
}
PictureLayerImpl::LayerEvictionTileIterator&
PictureLayerImpl::LayerEvictionTileIterator::
operator++() {
DCHECK(*this);
++current_iterator_;
while (!current_iterator_) {
if (!AdvanceToNextTiling())
break;
current_iterator_ = PictureLayerTiling::TilingEvictionTileIterator(
layer_->tilings_->tiling_at(CurrentTilingIndex()),
tree_priority_,
current_category_);
}
return *this;
}
PictureLayerImpl::LayerEvictionTileIterator::operator bool() const {
return !!current_iterator_;
}
bool PictureLayerImpl::LayerEvictionTileIterator::AdvanceToNextCategory() {
switch (current_category_) {
case PictureLayerTiling::EVENTUALLY:
current_category_ =
PictureLayerTiling::EVENTUALLY_AND_REQUIRED_FOR_ACTIVATION;
return true;
case PictureLayerTiling::EVENTUALLY_AND_REQUIRED_FOR_ACTIVATION:
current_category_ = PictureLayerTiling::SOON;
return true;
case PictureLayerTiling::SOON:
current_category_ = PictureLayerTiling::SOON_AND_REQUIRED_FOR_ACTIVATION;
return true;
case PictureLayerTiling::SOON_AND_REQUIRED_FOR_ACTIVATION:
current_category_ = PictureLayerTiling::NOW;
return true;
case PictureLayerTiling::NOW:
current_category_ = PictureLayerTiling::NOW_AND_REQUIRED_FOR_ACTIVATION;
return true;
case PictureLayerTiling::NOW_AND_REQUIRED_FOR_ACTIVATION:
return false;
}
NOTREACHED();
return false;
}
bool
PictureLayerImpl::LayerEvictionTileIterator::AdvanceToNextTilingRangeType() {
switch (current_tiling_range_type_) {
case PictureLayerTilingSet::HIGHER_THAN_HIGH_RES:
current_tiling_range_type_ = PictureLayerTilingSet::LOWER_THAN_LOW_RES;
return true;
case PictureLayerTilingSet::LOWER_THAN_LOW_RES:
current_tiling_range_type_ =
PictureLayerTilingSet::BETWEEN_HIGH_AND_LOW_RES;
return true;
case PictureLayerTilingSet::BETWEEN_HIGH_AND_LOW_RES:
current_tiling_range_type_ = PictureLayerTilingSet::LOW_RES;
return true;
case PictureLayerTilingSet::LOW_RES:
current_tiling_range_type_ = PictureLayerTilingSet::HIGH_RES;
return true;
case PictureLayerTilingSet::HIGH_RES:
if (!AdvanceToNextCategory())
return false;
current_tiling_range_type_ = PictureLayerTilingSet::HIGHER_THAN_HIGH_RES;
return true;
}
NOTREACHED();
return false;
}
bool PictureLayerImpl::LayerEvictionTileIterator::AdvanceToNextTiling() {
DCHECK_NE(current_tiling_, CurrentTilingRange().end);
++current_tiling_;
while (current_tiling_ == CurrentTilingRange().end) {
if (!AdvanceToNextTilingRangeType())
return false;
current_tiling_ = CurrentTilingRange().start;
}
return true;
}
PictureLayerTilingSet::TilingRange
PictureLayerImpl::LayerEvictionTileIterator::CurrentTilingRange() const {
return layer_->tilings_->GetTilingRange(current_tiling_range_type_);
}
size_t PictureLayerImpl::LayerEvictionTileIterator::CurrentTilingIndex() const {
DCHECK_NE(current_tiling_, CurrentTilingRange().end);
switch (current_tiling_range_type_) {
case PictureLayerTilingSet::HIGHER_THAN_HIGH_RES:
case PictureLayerTilingSet::LOW_RES:
case PictureLayerTilingSet::HIGH_RES:
return current_tiling_;
// Tilings in the following ranges are accessed in reverse order.
case PictureLayerTilingSet::BETWEEN_HIGH_AND_LOW_RES:
case PictureLayerTilingSet::LOWER_THAN_LOW_RES: {
PictureLayerTilingSet::TilingRange tiling_range = CurrentTilingRange();
size_t current_tiling_range_offset = current_tiling_ - tiling_range.start;
return tiling_range.end - 1 - current_tiling_range_offset;
}
}
NOTREACHED();
return 0;
}
} // namespace cc