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chromium / chromium / src / fb3006176202e29e4c1c007d8123bf0c85f48aba / . / cc / trees / layer_tree_host_impl.cc
blob: e66a3906e17db7d3124377331a65b3a661aa3ad5 [file] [log] [blame]
// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/trees/layer_tree_host_impl.h"
#include <algorithm>
#include <limits>
#include "base/basictypes.h"
#include "base/containers/hash_tables.h"
#include "base/json/json_writer.h"
#include "base/metrics/histogram.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/animation/animation_id_provider.h"
#include "cc/animation/scroll_offset_animation_curve.h"
#include "cc/animation/scrollbar_animation_controller.h"
#include "cc/animation/timing_function.h"
#include "cc/base/math_util.h"
#include "cc/base/util.h"
#include "cc/debug/benchmark_instrumentation.h"
#include "cc/debug/debug_rect_history.h"
#include "cc/debug/devtools_instrumentation.h"
#include "cc/debug/frame_rate_counter.h"
#include "cc/debug/frame_viewer_instrumentation.h"
#include "cc/debug/paint_time_counter.h"
#include "cc/debug/rendering_stats_instrumentation.h"
#include "cc/debug/traced_value.h"
#include "cc/input/page_scale_animation.h"
#include "cc/input/scroll_elasticity_helper.h"
#include "cc/input/top_controls_manager.h"
#include "cc/layers/append_quads_data.h"
#include "cc/layers/heads_up_display_layer_impl.h"
#include "cc/layers/layer_impl.h"
#include "cc/layers/layer_iterator.h"
#include "cc/layers/painted_scrollbar_layer_impl.h"
#include "cc/layers/render_surface_impl.h"
#include "cc/layers/scrollbar_layer_impl_base.h"
#include "cc/output/compositor_frame_metadata.h"
#include "cc/output/copy_output_request.h"
#include "cc/output/delegating_renderer.h"
#include "cc/output/gl_renderer.h"
#include "cc/output/software_renderer.h"
#include "cc/quads/render_pass_draw_quad.h"
#include "cc/quads/shared_quad_state.h"
#include "cc/quads/solid_color_draw_quad.h"
#include "cc/quads/texture_draw_quad.h"
#include "cc/resources/bitmap_tile_task_worker_pool.h"
#include "cc/resources/eviction_tile_priority_queue.h"
#include "cc/resources/gpu_rasterizer.h"
#include "cc/resources/gpu_tile_task_worker_pool.h"
#include "cc/resources/memory_history.h"
#include "cc/resources/one_copy_tile_task_worker_pool.h"
#include "cc/resources/picture_layer_tiling.h"
#include "cc/resources/pixel_buffer_tile_task_worker_pool.h"
#include "cc/resources/prioritized_resource_manager.h"
#include "cc/resources/raster_tile_priority_queue.h"
#include "cc/resources/resource_pool.h"
#include "cc/resources/software_rasterizer.h"
#include "cc/resources/texture_mailbox_deleter.h"
#include "cc/resources/tile_task_worker_pool.h"
#include "cc/resources/ui_resource_bitmap.h"
#include "cc/resources/zero_copy_tile_task_worker_pool.h"
#include "cc/scheduler/delay_based_time_source.h"
#include "cc/trees/damage_tracker.h"
#include "cc/trees/latency_info_swap_promise_monitor.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_host_common.h"
#include "cc/trees/layer_tree_impl.h"
#include "cc/trees/single_thread_proxy.h"
#include "cc/trees/tree_synchronizer.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "ui/gfx/frame_time.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/scroll_offset.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/vector2d_conversions.h"
namespace cc {
namespace {
// Small helper class that saves the current viewport location as the user sees
// it and resets to the same location.
class ViewportAnchor {
public:
ViewportAnchor(LayerImpl* inner_scroll, LayerImpl* outer_scroll)
: inner_(inner_scroll),
outer_(outer_scroll) {
viewport_in_content_coordinates_ = inner_->CurrentScrollOffset();
if (outer_)
viewport_in_content_coordinates_ += outer_->CurrentScrollOffset();
}
void ResetViewportToAnchoredPosition() {
DCHECK(outer_);
inner_->ClampScrollToMaxScrollOffset();
outer_->ClampScrollToMaxScrollOffset();
gfx::ScrollOffset viewport_location =
inner_->CurrentScrollOffset() + outer_->CurrentScrollOffset();
gfx::Vector2dF delta =
viewport_in_content_coordinates_.DeltaFrom(viewport_location);
delta = outer_->ScrollBy(delta);
inner_->ScrollBy(delta);
}
private:
LayerImpl* inner_;
LayerImpl* outer_;
gfx::ScrollOffset viewport_in_content_coordinates_;
};
void DidVisibilityChange(LayerTreeHostImpl* id, bool visible) {
if (visible) {
TRACE_EVENT_ASYNC_BEGIN1("cc", "LayerTreeHostImpl::SetVisible", id,
"LayerTreeHostImpl", id);
return;
}
TRACE_EVENT_ASYNC_END0("cc", "LayerTreeHostImpl::SetVisible", id);
}
size_t GetMaxTransferBufferUsageBytes(
const ContextProvider::Capabilities& context_capabilities,
double refresh_rate) {
// We want to make sure the default transfer buffer size is equal to the
// amount of data that can be uploaded by the compositor to avoid stalling
// the pipeline.
// For reference Chromebook Pixel can upload 1MB in about 0.5ms.
const size_t kMaxBytesUploadedPerMs = 1024 * 1024 * 2;
// We need to upload at least enough work to keep the GPU process busy until
// the next time it can handle a request to start more uploads from the
// compositor. We assume that it will pick up any sent upload requests within
// the time of a vsync, since the browser will want to swap a frame within
// that time interval, and then uploads should have a chance to be processed.
size_t ms_per_frame = std::floor(1000.0 / refresh_rate);
size_t max_transfer_buffer_usage_bytes =
ms_per_frame * kMaxBytesUploadedPerMs;
// The context may request a lower limit based on the device capabilities.
return std::min(context_capabilities.max_transfer_buffer_usage_bytes,
max_transfer_buffer_usage_bytes);
}
size_t GetMaxStagingResourceCount() {
// Upper bound for number of staging resource to allow.
return 32;
}
} // namespace
LayerTreeHostImpl::FrameData::FrameData() : has_no_damage(false) {
}
LayerTreeHostImpl::FrameData::~FrameData() {}
scoped_ptr<LayerTreeHostImpl> LayerTreeHostImpl::Create(
const LayerTreeSettings& settings,
LayerTreeHostImplClient* client,
Proxy* proxy,
RenderingStatsInstrumentation* rendering_stats_instrumentation,
SharedBitmapManager* shared_bitmap_manager,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
int id) {
return make_scoped_ptr(new LayerTreeHostImpl(settings,
client,
proxy,
rendering_stats_instrumentation,
shared_bitmap_manager,
gpu_memory_buffer_manager,
id));
}
LayerTreeHostImpl::LayerTreeHostImpl(
const LayerTreeSettings& settings,
LayerTreeHostImplClient* client,
Proxy* proxy,
RenderingStatsInstrumentation* rendering_stats_instrumentation,
SharedBitmapManager* shared_bitmap_manager,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
int id)
: client_(client),
proxy_(proxy),
use_gpu_rasterization_(false),
gpu_rasterization_status_(GpuRasterizationStatus::OFF_DEVICE),
input_handler_client_(NULL),
did_lock_scrolling_layer_(false),
should_bubble_scrolls_(false),
wheel_scrolling_(false),
scroll_affects_scroll_handler_(false),
scroll_layer_id_when_mouse_over_scrollbar_(0),
tile_priorities_dirty_(false),
root_layer_scroll_offset_delegate_(NULL),
settings_(settings),
visible_(true),
cached_managed_memory_policy_(
PrioritizedResourceManager::DefaultMemoryAllocationLimit(),
gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
ManagedMemoryPolicy::kDefaultNumResourcesLimit),
pinch_gesture_active_(false),
pinch_gesture_end_should_clear_scrolling_layer_(false),
fps_counter_(FrameRateCounter::Create(proxy_->HasImplThread())),
paint_time_counter_(PaintTimeCounter::Create()),
memory_history_(MemoryHistory::Create()),
debug_rect_history_(DebugRectHistory::Create()),
texture_mailbox_deleter_(new TextureMailboxDeleter(
proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
: proxy_->MainThreadTaskRunner())),
max_memory_needed_bytes_(0),
zero_budget_(false),
device_scale_factor_(1.f),
resourceless_software_draw_(false),
begin_impl_frame_interval_(BeginFrameArgs::DefaultInterval()),
animation_registrar_(AnimationRegistrar::Create()),
rendering_stats_instrumentation_(rendering_stats_instrumentation),
micro_benchmark_controller_(this),
shared_bitmap_manager_(shared_bitmap_manager),
gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
id_(id),
requires_high_res_to_draw_(false),
is_likely_to_require_a_draw_(false),
frame_timing_tracker_(FrameTimingTracker::Create()) {
DCHECK(proxy_->IsImplThread());
DidVisibilityChange(this, visible_);
animation_registrar_->set_supports_scroll_animations(
proxy_->SupportsImplScrolling());
SetDebugState(settings.initial_debug_state);
// LTHI always has an active tree.
active_tree_ =
LayerTreeImpl::create(this, new SyncedProperty<ScaleGroup>(),
new SyncedTopControls, new SyncedElasticOverscroll);
TRACE_EVENT_OBJECT_CREATED_WITH_ID(
TRACE_DISABLED_BY_DEFAULT("cc.debug"), "cc::LayerTreeHostImpl", id_);
top_controls_manager_ =
TopControlsManager::Create(this,
settings.top_controls_show_threshold,
settings.top_controls_hide_threshold);
}
LayerTreeHostImpl::~LayerTreeHostImpl() {
DCHECK(proxy_->IsImplThread());
TRACE_EVENT0("cc", "LayerTreeHostImpl::~LayerTreeHostImpl()");
TRACE_EVENT_OBJECT_DELETED_WITH_ID(
TRACE_DISABLED_BY_DEFAULT("cc.debug"), "cc::LayerTreeHostImpl", id_);
if (input_handler_client_) {
input_handler_client_->WillShutdown();
input_handler_client_ = NULL;
}
if (scroll_elasticity_helper_)
scroll_elasticity_helper_.reset();
// The layer trees must be destroyed before the layer tree host. We've
// made a contract with our animation controllers that the registrar
// will outlive them, and we must make good.
if (recycle_tree_)
recycle_tree_->Shutdown();
if (pending_tree_)
pending_tree_->Shutdown();
active_tree_->Shutdown();
recycle_tree_ = nullptr;
pending_tree_ = nullptr;
active_tree_ = nullptr;
DestroyTileManager();
}
void LayerTreeHostImpl::BeginMainFrameAborted(CommitEarlyOutReason reason) {
// If the begin frame data was handled, then scroll and scale set was applied
// by the main thread, so the active tree needs to be updated as if these sent
// values were applied and committed.
if (CommitEarlyOutHandledCommit(reason)) {
active_tree_->ApplySentScrollAndScaleDeltasFromAbortedCommit();
active_tree_->ResetContentsTexturesPurged();
}
}
void LayerTreeHostImpl::BeginCommit() {
TRACE_EVENT0("cc", "LayerTreeHostImpl::BeginCommit");
// Ensure all textures are returned so partial texture updates can happen
// during the commit. Impl-side-painting doesn't upload during commits, so
// is unaffected.
if (!settings_.impl_side_painting && output_surface_)
output_surface_->ForceReclaimResources();
if (settings_.impl_side_painting && !proxy_->CommitToActiveTree())
CreatePendingTree();
}
void LayerTreeHostImpl::CommitComplete() {
TRACE_EVENT0("cc", "LayerTreeHostImpl::CommitComplete");
sync_tree()->set_needs_update_draw_properties();
if (settings_.impl_side_painting) {
// Impl-side painting needs an update immediately post-commit to have the
// opportunity to create tilings. Other paths can call UpdateDrawProperties
// more lazily when needed prior to drawing. Because invalidations may
// be coming from the main thread, it's safe to do an update for lcd text
// at this point and see if lcd text needs to be disabled on any layers.
bool update_lcd_text = true;
sync_tree()->UpdateDrawProperties(update_lcd_text);
// Start working on newly created tiles immediately if needed.
if (tile_manager_ && tile_priorities_dirty_)
PrepareTiles();
else
NotifyReadyToActivate();
} else {
// If we're not in impl-side painting, the tree is immediately considered
// active.
ActivateSyncTree();
}
micro_benchmark_controller_.DidCompleteCommit();
}
bool LayerTreeHostImpl::CanDraw() const {
// Note: If you are changing this function or any other function that might
// affect the result of CanDraw, make sure to call
// client_->OnCanDrawStateChanged in the proper places and update the
// NotifyIfCanDrawChanged test.
if (!renderer_) {
TRACE_EVENT_INSTANT0("cc", "LayerTreeHostImpl::CanDraw no renderer",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
// Must have an OutputSurface if |renderer_| is not NULL.
DCHECK(output_surface_);
// TODO(boliu): Make draws without root_layer work and move this below
// draw_and_swap_full_viewport_every_frame check. Tracked in crbug.com/264967.
if (!active_tree_->root_layer()) {
TRACE_EVENT_INSTANT0("cc", "LayerTreeHostImpl::CanDraw no root layer",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
if (output_surface_->capabilities().draw_and_swap_full_viewport_every_frame)
return true;
if (DrawViewportSize().IsEmpty()) {
TRACE_EVENT_INSTANT0("cc", "LayerTreeHostImpl::CanDraw empty viewport",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
if (active_tree_->ViewportSizeInvalid()) {
TRACE_EVENT_INSTANT0(
"cc", "LayerTreeHostImpl::CanDraw viewport size recently changed",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
if (active_tree_->ContentsTexturesPurged()) {
TRACE_EVENT_INSTANT0(
"cc", "LayerTreeHostImpl::CanDraw contents textures purged",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
if (EvictedUIResourcesExist()) {
TRACE_EVENT_INSTANT0(
"cc", "LayerTreeHostImpl::CanDraw UI resources evicted not recreated",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
return true;
}
void LayerTreeHostImpl::Animate(base::TimeTicks monotonic_time) {
if (input_handler_client_)
input_handler_client_->Animate(monotonic_time);
AnimatePageScale(monotonic_time);
AnimateLayers(monotonic_time);
AnimateScrollbars(monotonic_time);
AnimateTopControls(monotonic_time);
}
void LayerTreeHostImpl::PrepareTiles() {
if (!tile_manager_)
return;
if (!tile_priorities_dirty_)
return;
tile_priorities_dirty_ = false;
tile_manager_->PrepareTiles(global_tile_state_);
client_->DidPrepareTiles();
}
void LayerTreeHostImpl::StartPageScaleAnimation(
const gfx::Vector2d& target_offset,
bool anchor_point,
float page_scale,
base::TimeDelta duration) {
if (!InnerViewportScrollLayer())
return;
gfx::ScrollOffset scroll_total = active_tree_->TotalScrollOffset();
gfx::SizeF scaled_scrollable_size = active_tree_->ScrollableSize();
gfx::SizeF viewport_size =
active_tree_->InnerViewportContainerLayer()->bounds();
// Easing constants experimentally determined.
scoped_ptr<TimingFunction> timing_function =
CubicBezierTimingFunction::Create(.8, 0, .3, .9);
// TODO(miletus) : Pass in ScrollOffset.
page_scale_animation_ = PageScaleAnimation::Create(
ScrollOffsetToVector2dF(scroll_total),
active_tree_->current_page_scale_factor(), viewport_size,
scaled_scrollable_size, timing_function.Pass());
if (anchor_point) {
gfx::Vector2dF anchor(target_offset);
page_scale_animation_->ZoomWithAnchor(anchor,
page_scale,
duration.InSecondsF());
} else {
gfx::Vector2dF scaled_target_offset = target_offset;
page_scale_animation_->ZoomTo(scaled_target_offset,
page_scale,
duration.InSecondsF());
}
SetNeedsAnimate();
client_->SetNeedsCommitOnImplThread();
client_->RenewTreePriority();
}
bool LayerTreeHostImpl::IsCurrentlyScrollingLayerAt(
const gfx::Point& viewport_point,
InputHandler::ScrollInputType type) {
if (!CurrentlyScrollingLayer())
return false;
gfx::PointF device_viewport_point =
gfx::ScalePoint(viewport_point, device_scale_factor_);
LayerImpl* layer_impl =
active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
bool scroll_on_main_thread = false;
LayerImpl* scrolling_layer_impl = FindScrollLayerForDeviceViewportPoint(
device_viewport_point, type, layer_impl, &scroll_on_main_thread, NULL);
return CurrentlyScrollingLayer() == scrolling_layer_impl;
}
bool LayerTreeHostImpl::HaveWheelEventHandlersAt(
const gfx::Point& viewport_point) {
gfx::PointF device_viewport_point =
gfx::ScalePoint(viewport_point, device_scale_factor_);
LayerImpl* layer_impl =
active_tree_->FindLayerWithWheelHandlerThatIsHitByPoint(
device_viewport_point);
return layer_impl != NULL;
}
static LayerImpl* NextScrollLayer(LayerImpl* layer) {
if (LayerImpl* scroll_parent = layer->scroll_parent())
return scroll_parent;
return layer->parent();
}
static ScrollBlocksOn EffectiveScrollBlocksOn(LayerImpl* layer) {
ScrollBlocksOn blocks = SCROLL_BLOCKS_ON_NONE;
for (; layer; layer = NextScrollLayer(layer)) {
blocks |= layer->scroll_blocks_on();
}
return blocks;
}
bool LayerTreeHostImpl::DoTouchEventsBlockScrollAt(
const gfx::Point& viewport_point) {
gfx::PointF device_viewport_point =
gfx::ScalePoint(viewport_point, device_scale_factor_);
// First check if scrolling at this point is required to block on any
// touch event handlers. Note that we must start at the innermost layer
// (as opposed to only the layer found to contain a touch handler region
// below) to ensure all relevant scroll-blocks-on values are applied.
LayerImpl* layer_impl =
active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
ScrollBlocksOn blocking = EffectiveScrollBlocksOn(layer_impl);
if (!(blocking & SCROLL_BLOCKS_ON_START_TOUCH))
return false;
// Now determine if there are actually any handlers at that point.
// TODO(rbyers): Consider also honoring touch-action (crbug.com/347272).
layer_impl = active_tree_->FindLayerThatIsHitByPointInTouchHandlerRegion(
device_viewport_point);
return layer_impl != NULL;
}
scoped_ptr<SwapPromiseMonitor>
LayerTreeHostImpl::CreateLatencyInfoSwapPromiseMonitor(
ui::LatencyInfo* latency) {
return make_scoped_ptr(
new LatencyInfoSwapPromiseMonitor(latency, NULL, this));
}
ScrollElasticityHelper* LayerTreeHostImpl::CreateScrollElasticityHelper() {
DCHECK(!scroll_elasticity_helper_);
if (settings_.enable_elastic_overscroll) {
scroll_elasticity_helper_.reset(
ScrollElasticityHelper::CreateForLayerTreeHostImpl(this));
}
return scroll_elasticity_helper_.get();
}
void LayerTreeHostImpl::QueueSwapPromiseForMainThreadScrollUpdate(
scoped_ptr<SwapPromise> swap_promise) {
swap_promises_for_main_thread_scroll_update_.push_back(swap_promise.Pass());
}
void LayerTreeHostImpl::TrackDamageForAllSurfaces(
LayerImpl* root_draw_layer,
const LayerImplList& render_surface_layer_list) {
// For now, we use damage tracking to compute a global scissor. To do this, we
// must compute all damage tracking before drawing anything, so that we know
// the root damage rect. The root damage rect is then used to scissor each
// surface.
for (int surface_index = render_surface_layer_list.size() - 1;
surface_index >= 0;
--surface_index) {
LayerImpl* render_surface_layer = render_surface_layer_list[surface_index];
RenderSurfaceImpl* render_surface = render_surface_layer->render_surface();
DCHECK(render_surface);
render_surface->damage_tracker()->UpdateDamageTrackingState(
render_surface->layer_list(),
render_surface_layer->id(),
render_surface->SurfacePropertyChangedOnlyFromDescendant(),
render_surface->content_rect(),
render_surface_layer->mask_layer(),
render_surface_layer->filters());
}
}
void LayerTreeHostImpl::FrameData::AsValueInto(
base::trace_event::TracedValue* value) const {
value->SetBoolean("has_no_damage", has_no_damage);
// Quad data can be quite large, so only dump render passes if we select
// cc.debug.quads.
bool quads_enabled;
TRACE_EVENT_CATEGORY_GROUP_ENABLED(
TRACE_DISABLED_BY_DEFAULT("cc.debug.quads"), &quads_enabled);
if (quads_enabled) {
value->BeginArray("render_passes");
for (size_t i = 0; i < render_passes.size(); ++i) {
value->BeginDictionary();
render_passes[i]->AsValueInto(value);
value->EndDictionary();
}
value->EndArray();
}
}
void LayerTreeHostImpl::FrameData::AppendRenderPass(
scoped_ptr<RenderPass> render_pass) {
render_passes_by_id[render_pass->id] = render_pass.get();
render_passes.push_back(render_pass.Pass());
}
DrawMode LayerTreeHostImpl::GetDrawMode() const {
if (resourceless_software_draw_) {
return DRAW_MODE_RESOURCELESS_SOFTWARE;
} else if (output_surface_->context_provider()) {
return DRAW_MODE_HARDWARE;
} else {
DCHECK_EQ(!output_surface_->software_device(),
output_surface_->capabilities().delegated_rendering &&
!output_surface_->capabilities().deferred_gl_initialization)
<< output_surface_->capabilities().delegated_rendering << " "
<< output_surface_->capabilities().deferred_gl_initialization;
return DRAW_MODE_SOFTWARE;
}
}
static void AppendQuadsForRenderSurfaceLayer(
RenderPass* target_render_pass,
LayerImpl* layer,
const RenderPass* contributing_render_pass,
AppendQuadsData* append_quads_data) {
RenderSurfaceImpl* surface = layer->render_surface();
const gfx::Transform& draw_transform = surface->draw_transform();
const Occlusion& occlusion = surface->occlusion_in_content_space();
SkColor debug_border_color = surface->GetDebugBorderColor();
float debug_border_width = surface->GetDebugBorderWidth();
LayerImpl* mask_layer = layer->mask_layer();
surface->AppendQuads(target_render_pass, draw_transform, occlusion,
debug_border_color, debug_border_width, mask_layer,
append_quads_data, contributing_render_pass->id);
// Add replica after the surface so that it appears below the surface.
if (layer->has_replica()) {
const gfx::Transform& replica_draw_transform =
surface->replica_draw_transform();
Occlusion replica_occlusion = occlusion.GetOcclusionWithGivenDrawTransform(
surface->replica_draw_transform());
SkColor replica_debug_border_color = surface->GetReplicaDebugBorderColor();
float replica_debug_border_width = surface->GetReplicaDebugBorderWidth();
// TODO(danakj): By using the same RenderSurfaceImpl for both the
// content and its reflection, it's currently not possible to apply a
// separate mask to the reflection layer or correctly handle opacity in
// reflections (opacity must be applied after drawing both the layer and its
// reflection). The solution is to introduce yet another RenderSurfaceImpl
// to draw the layer and its reflection in. For now we only apply a separate
// reflection mask if the contents don't have a mask of their own.
LayerImpl* replica_mask_layer =
mask_layer ? mask_layer : layer->replica_layer()->mask_layer();
surface->AppendQuads(target_render_pass, replica_draw_transform,
replica_occlusion, replica_debug_border_color,
replica_debug_border_width, replica_mask_layer,
append_quads_data, contributing_render_pass->id);
}
}
static void AppendQuadsToFillScreen(const gfx::Rect& root_scroll_layer_rect,
RenderPass* target_render_pass,
LayerImpl* root_layer,
SkColor screen_background_color,
const Region& fill_region) {
if (!root_layer || !SkColorGetA(screen_background_color))
return;
if (fill_region.IsEmpty())
return;
// Manually create the quad state for the gutter quads, as the root layer
// doesn't have any bounds and so can't generate this itself.
// TODO(danakj): Make the gutter quads generated by the solid color layer
// (make it smarter about generating quads to fill unoccluded areas).
gfx::Rect root_target_rect = root_layer->render_surface()->content_rect();
float opacity = 1.f;
int sorting_context_id = 0;
SharedQuadState* shared_quad_state =
target_render_pass->CreateAndAppendSharedQuadState();
shared_quad_state->SetAll(gfx::Transform(),
root_target_rect.size(),
root_target_rect,
root_target_rect,
false,
opacity,
SkXfermode::kSrcOver_Mode,
sorting_context_id);
for (Region::Iterator fill_rects(fill_region); fill_rects.has_rect();
fill_rects.next()) {
gfx::Rect screen_space_rect = fill_rects.rect();
gfx::Rect visible_screen_space_rect = screen_space_rect;
// Skip the quad culler and just append the quads directly to avoid
// occlusion checks.
SolidColorDrawQuad* quad =
target_render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
quad->SetNew(shared_quad_state,
screen_space_rect,
visible_screen_space_rect,
screen_background_color,
false);
}
}
DrawResult LayerTreeHostImpl::CalculateRenderPasses(
FrameData* frame) {
DCHECK(frame->render_passes.empty());
DCHECK(CanDraw());
DCHECK(active_tree_->root_layer());
TrackDamageForAllSurfaces(active_tree_->root_layer(),
*frame->render_surface_layer_list);
// If the root render surface has no visible damage, then don't generate a
// frame at all.
RenderSurfaceImpl* root_surface =
active_tree_->root_layer()->render_surface();
bool root_surface_has_no_visible_damage =
!root_surface->damage_tracker()->current_damage_rect().Intersects(
root_surface->content_rect());
bool root_surface_has_contributing_layers =
!root_surface->layer_list().empty();
bool hud_wants_to_draw_ = active_tree_->hud_layer() &&
active_tree_->hud_layer()->IsAnimatingHUDContents();
if (root_surface_has_contributing_layers &&
root_surface_has_no_visible_damage &&
active_tree_->LayersWithCopyOutputRequest().empty() &&
!output_surface_->capabilities().can_force_reclaim_resources &&
!hud_wants_to_draw_) {
TRACE_EVENT0("cc",
"LayerTreeHostImpl::CalculateRenderPasses::EmptyDamageRect");
frame->has_no_damage = true;
DCHECK(!output_surface_->capabilities()
.draw_and_swap_full_viewport_every_frame);
return DRAW_SUCCESS;
}
TRACE_EVENT_BEGIN2(
"cc", "LayerTreeHostImpl::CalculateRenderPasses",
"render_surface_layer_list.size()",
static_cast<uint64>(frame->render_surface_layer_list->size()),
"RequiresHighResToDraw", RequiresHighResToDraw());
// Create the render passes in dependency order.
for (int surface_index = frame->render_surface_layer_list->size() - 1;
surface_index >= 0;
--surface_index) {
LayerImpl* render_surface_layer =
(*frame->render_surface_layer_list)[surface_index];
RenderSurfaceImpl* render_surface = render_surface_layer->render_surface();
bool should_draw_into_render_pass =
render_surface_layer->parent() == NULL ||
render_surface->contributes_to_drawn_surface() ||
render_surface_layer->HasCopyRequest();
if (should_draw_into_render_pass)
render_surface->AppendRenderPasses(frame);
}
// When we are displaying the HUD, change the root damage rect to cover the
// entire root surface. This will disable partial-swap/scissor optimizations
// that would prevent the HUD from updating, since the HUD does not cause
// damage itself, to prevent it from messing with damage visualizations. Since
// damage visualizations are done off the LayerImpls and RenderSurfaceImpls,
// changing the RenderPass does not affect them.
if (active_tree_->hud_layer()) {
RenderPass* root_pass = frame->render_passes.back();
root_pass->damage_rect = root_pass->output_rect;
}
// Grab this region here before iterating layers. Taking copy requests from
// the layers while constructing the render passes will dirty the render
// surface layer list and this unoccluded region, flipping the dirty bit to
// true, and making us able to query for it without doing
// UpdateDrawProperties again. The value inside the Region is not actually
// changed until UpdateDrawProperties happens, so a reference to it is safe.
const Region& unoccluded_screen_space_region =
active_tree_->UnoccludedScreenSpaceRegion();
// Typically when we are missing a texture and use a checkerboard quad, we
// still draw the frame. However when the layer being checkerboarded is moving
// due to an impl-animation, we drop the frame to avoid flashing due to the
// texture suddenly appearing in the future.
DrawResult draw_result = DRAW_SUCCESS;
int layers_drawn = 0;
const DrawMode draw_mode = GetDrawMode();
int num_missing_tiles = 0;
int num_incomplete_tiles = 0;
bool have_copy_request = false;
bool have_missing_animated_tiles = false;
auto end = LayerIterator<LayerImpl>::End(frame->render_surface_layer_list);
for (auto it =
LayerIterator<LayerImpl>::Begin(frame->render_surface_layer_list);
it != end; ++it) {
RenderPassId target_render_pass_id =
it.target_render_surface_layer()->render_surface()->GetRenderPassId();
RenderPass* target_render_pass =
frame->render_passes_by_id[target_render_pass_id];
AppendQuadsData append_quads_data;
if (it.represents_target_render_surface()) {
if (it->HasCopyRequest()) {
have_copy_request = true;
it->TakeCopyRequestsAndTransformToTarget(
&target_render_pass->copy_requests);
}
} else if (it.represents_contributing_render_surface() &&
it->render_surface()->contributes_to_drawn_surface()) {
RenderPassId contributing_render_pass_id =
it->render_surface()->GetRenderPassId();
RenderPass* contributing_render_pass =
frame->render_passes_by_id[contributing_render_pass_id];
AppendQuadsForRenderSurfaceLayer(target_render_pass,
*it,
contributing_render_pass,
&append_quads_data);
} else if (it.represents_itself() &&
!it->visible_content_rect().IsEmpty()) {
bool occluded =
it->draw_properties().occlusion_in_content_space.IsOccluded(
it->visible_content_rect());
if (!occluded && it->WillDraw(draw_mode, resource_provider_.get())) {
DCHECK_EQ(active_tree_, it->layer_tree_impl());
frame->will_draw_layers.push_back(*it);
if (it->HasContributingDelegatedRenderPasses()) {
RenderPassId contributing_render_pass_id =
it->FirstContributingRenderPassId();
while (frame->render_passes_by_id.find(contributing_render_pass_id) !=
frame->render_passes_by_id.end()) {
RenderPass* render_pass =
frame->render_passes_by_id[contributing_render_pass_id];
it->AppendQuads(render_pass, &append_quads_data);
contributing_render_pass_id =
it->NextContributingRenderPassId(contributing_render_pass_id);
}
}
it->AppendQuads(target_render_pass, &append_quads_data);
// For layers that represent themselves, add composite frame timing
// requests if the visible rect intersects the requested rect.
for (const auto& request : it->frame_timing_requests()) {
const gfx::Rect& request_content_rect =
it->LayerRectToContentRect(request.rect());
if (request_content_rect.Intersects(it->visible_content_rect())) {
frame->composite_events.push_back(
FrameTimingTracker::FrameAndRectIds(
active_tree_->source_frame_number(), request.id()));
}
}
}
++layers_drawn;
}
rendering_stats_instrumentation_->AddVisibleContentArea(
append_quads_data.visible_content_area);
rendering_stats_instrumentation_->AddApproximatedVisibleContentArea(
append_quads_data.approximated_visible_content_area);
num_missing_tiles += append_quads_data.num_missing_tiles;
num_incomplete_tiles += append_quads_data.num_incomplete_tiles;
if (append_quads_data.num_missing_tiles) {
bool layer_has_animating_transform =
it->screen_space_transform_is_animating() ||
it->draw_transform_is_animating();
if (layer_has_animating_transform)
have_missing_animated_tiles = true;
}
}
if (have_missing_animated_tiles)
draw_result = DRAW_ABORTED_CHECKERBOARD_ANIMATIONS;
// When we have a copy request for a layer, we need to draw even if there
// would be animating checkerboards, because failing under those conditions
// triggers a new main frame, which may cause the copy request layer to be
// destroyed.
// TODO(danakj): Leaking scheduler internals into LayerTreeHostImpl here.
if (have_copy_request)
draw_result = DRAW_SUCCESS;
// When we require high res to draw, abort the draw (almost) always. This does
// not cause the scheduler to do a main frame, instead it will continue to try
// drawing until we finally complete, so the copy request will not be lost.
if (num_incomplete_tiles || num_missing_tiles) {
if (RequiresHighResToDraw())
draw_result = DRAW_ABORTED_MISSING_HIGH_RES_CONTENT;
}
// When this capability is set we don't have control over the surface the
// compositor draws to, so even though the frame may not be complete, the
// previous frame has already been potentially lost, so an incomplete frame is
// better than nothing, so this takes highest precidence.
if (output_surface_->capabilities().draw_and_swap_full_viewport_every_frame)
draw_result = DRAW_SUCCESS;
#if DCHECK_IS_ON()
for (const auto& render_pass : frame->render_passes) {
for (const auto& quad : render_pass->quad_list)
DCHECK(quad->shared_quad_state);
DCHECK(frame->render_passes_by_id.find(render_pass->id) !=
frame->render_passes_by_id.end());
}
#endif
DCHECK(frame->render_passes.back()->output_rect.origin().IsOrigin());
if (!active_tree_->has_transparent_background()) {
frame->render_passes.back()->has_transparent_background = false;
AppendQuadsToFillScreen(
active_tree_->RootScrollLayerDeviceViewportBounds(),
frame->render_passes.back(), active_tree_->root_layer(),
active_tree_->background_color(), unoccluded_screen_space_region);
}
RemoveRenderPasses(CullRenderPassesWithNoQuads(), frame);
renderer_->DecideRenderPassAllocationsForFrame(frame->render_passes);
// Any copy requests left in the tree are not going to get serviced, and
// should be aborted.
ScopedPtrVector<CopyOutputRequest> requests_to_abort;
while (!active_tree_->LayersWithCopyOutputRequest().empty()) {
LayerImpl* layer = active_tree_->LayersWithCopyOutputRequest().back();
layer->TakeCopyRequestsAndTransformToTarget(&requests_to_abort);
}
for (size_t i = 0; i < requests_to_abort.size(); ++i)
requests_to_abort[i]->SendEmptyResult();
// If we're making a frame to draw, it better have at least one render pass.
DCHECK(!frame->render_passes.empty());
if (active_tree_->has_ever_been_drawn()) {
UMA_HISTOGRAM_COUNTS_100(
"Compositing.RenderPass.AppendQuadData.NumMissingTiles",
num_missing_tiles);
UMA_HISTOGRAM_COUNTS_100(
"Compositing.RenderPass.AppendQuadData.NumIncompleteTiles",
num_incomplete_tiles);
}
// Should only have one render pass in resourceless software mode.
DCHECK(draw_mode != DRAW_MODE_RESOURCELESS_SOFTWARE ||
frame->render_passes.size() == 1u)
<< frame->render_passes.size();
TRACE_EVENT_END2("cc", "LayerTreeHostImpl::CalculateRenderPasses",
"draw_result", draw_result, "missing tiles",
num_missing_tiles);
return draw_result;
}
void LayerTreeHostImpl::MainThreadHasStoppedFlinging() {
top_controls_manager_->MainThreadHasStoppedFlinging();
if (input_handler_client_)
input_handler_client_->MainThreadHasStoppedFlinging();
}
void LayerTreeHostImpl::DidAnimateScrollOffset() {
client_->SetNeedsCommitOnImplThread();
client_->RenewTreePriority();
}
void LayerTreeHostImpl::SetViewportDamage(const gfx::Rect& damage_rect) {
viewport_damage_rect_.Union(damage_rect);
}
static inline RenderPass* FindRenderPassById(
RenderPassId render_pass_id,
const LayerTreeHostImpl::FrameData& frame) {
RenderPassIdHashMap::const_iterator it =
frame.render_passes_by_id.find(render_pass_id);
return it != frame.render_passes_by_id.end() ? it->second : NULL;
}
static void RemoveRenderPassesRecursive(RenderPassId remove_render_pass_id,
LayerTreeHostImpl::FrameData* frame) {
RenderPass* remove_render_pass =
FindRenderPassById(remove_render_pass_id, *frame);
// The pass was already removed by another quad - probably the original, and
// we are the replica.
if (!remove_render_pass)
return;
RenderPassList& render_passes = frame->render_passes;
RenderPassList::iterator to_remove = std::find(render_passes.begin(),
render_passes.end(),
remove_render_pass);
DCHECK(to_remove != render_passes.end());
scoped_ptr<RenderPass> removed_pass = render_passes.take(to_remove);
frame->render_passes.erase(to_remove);
frame->render_passes_by_id.erase(remove_render_pass_id);
// Now follow up for all RenderPass quads and remove their RenderPasses
// recursively.
const QuadList& quad_list = removed_pass->quad_list;
for (auto quad_list_iterator = quad_list.BackToFrontBegin();
quad_list_iterator != quad_list.BackToFrontEnd();
++quad_list_iterator) {
const DrawQuad* current_quad = *quad_list_iterator;
if (current_quad->material != DrawQuad::RENDER_PASS)
continue;
RenderPassId next_remove_render_pass_id =
RenderPassDrawQuad::MaterialCast(current_quad)->render_pass_id;
RemoveRenderPassesRecursive(next_remove_render_pass_id, frame);
}
}
bool LayerTreeHostImpl::CullRenderPassesWithNoQuads::ShouldRemoveRenderPass(
const RenderPassDrawQuad& quad, const FrameData& frame) const {
const RenderPass* render_pass =
FindRenderPassById(quad.render_pass_id, frame);
if (!render_pass)
return false;
// If any quad or RenderPass draws into this RenderPass, then keep it.
const QuadList& quad_list = render_pass->quad_list;
for (auto quad_list_iterator = quad_list.BackToFrontBegin();
quad_list_iterator != quad_list.BackToFrontEnd();
++quad_list_iterator) {
const DrawQuad* current_quad = *quad_list_iterator;
if (current_quad->material != DrawQuad::RENDER_PASS)
return false;
const RenderPass* contributing_pass = FindRenderPassById(
RenderPassDrawQuad::MaterialCast(current_quad)->render_pass_id, frame);
if (contributing_pass)
return false;
}
return true;
}
// Defined for linking tests.
template CC_EXPORT void LayerTreeHostImpl::RemoveRenderPasses<
LayerTreeHostImpl::CullRenderPassesWithNoQuads>(
CullRenderPassesWithNoQuads culler, FrameData*);
// static
template <typename RenderPassCuller>
void LayerTreeHostImpl::RemoveRenderPasses(RenderPassCuller culler,
FrameData* frame) {
for (size_t it = culler.RenderPassListBegin(frame->render_passes);
it != culler.RenderPassListEnd(frame->render_passes);
it = culler.RenderPassListNext(it)) {
const RenderPass* current_pass = frame->render_passes[it];
const QuadList& quad_list = current_pass->quad_list;
for (auto quad_list_iterator = quad_list.BackToFrontBegin();
quad_list_iterator != quad_list.BackToFrontEnd();
++quad_list_iterator) {
const DrawQuad* current_quad = *quad_list_iterator;
if (current_quad->material != DrawQuad::RENDER_PASS)
continue;
const RenderPassDrawQuad* render_pass_quad =
RenderPassDrawQuad::MaterialCast(current_quad);
if (!culler.ShouldRemoveRenderPass(*render_pass_quad, *frame))
continue;
// We are changing the vector in the middle of iteration. Because we
// delete render passes that draw into the current pass, we are
// guaranteed that any data from the iterator to the end will not
// change. So, capture the iterator position from the end of the
// list, and restore it after the change.
size_t position_from_end = frame->render_passes.size() - it;
RemoveRenderPassesRecursive(render_pass_quad->render_pass_id, frame);
it = frame->render_passes.size() - position_from_end;
DCHECK_GE(frame->render_passes.size(), position_from_end);
}
}
}
DrawResult LayerTreeHostImpl::PrepareToDraw(FrameData* frame) {
TRACE_EVENT1("cc",
"LayerTreeHostImpl::PrepareToDraw",
"SourceFrameNumber",
active_tree_->source_frame_number());
if (input_handler_client_)
input_handler_client_->ReconcileElasticOverscrollAndRootScroll();
UMA_HISTOGRAM_CUSTOM_COUNTS(
"Compositing.NumActiveLayers", active_tree_->NumLayers(), 1, 400, 20);
bool update_lcd_text = false;
bool ok = active_tree_->UpdateDrawProperties(update_lcd_text);
DCHECK(ok) << "UpdateDrawProperties failed during draw";
// This will cause NotifyTileStateChanged() to be called for any visible tiles
// that completed, which will add damage to the frame for them so they appear
// as part of the current frame being drawn.
if (tile_manager_)
tile_manager_->UpdateVisibleTiles(global_tile_state_);
frame->render_surface_layer_list = &active_tree_->RenderSurfaceLayerList();
frame->render_passes.clear();
frame->render_passes_by_id.clear();
frame->will_draw_layers.clear();
frame->has_no_damage = false;
if (active_tree_->root_layer()) {
gfx::Rect device_viewport_damage_rect = viewport_damage_rect_;
viewport_damage_rect_ = gfx::Rect();
active_tree_->root_layer()->render_surface()->damage_tracker()->
AddDamageNextUpdate(device_viewport_damage_rect);
}
DrawResult draw_result = CalculateRenderPasses(frame);
if (draw_result != DRAW_SUCCESS) {
DCHECK(!output_surface_->capabilities()
.draw_and_swap_full_viewport_every_frame);
return draw_result;
}
// If we return DRAW_SUCCESS, then we expect DrawLayers() to be called before
// this function is called again.
return draw_result;
}
void LayerTreeHostImpl::EvictTexturesForTesting() {
EnforceManagedMemoryPolicy(ManagedMemoryPolicy(0));
}
void LayerTreeHostImpl::BlockNotifyReadyToActivateForTesting(bool block) {
NOTREACHED();
}
void LayerTreeHostImpl::ResetTreesForTesting() {
if (active_tree_)
active_tree_->DetachLayerTree();
active_tree_ =
LayerTreeImpl::create(this, active_tree()->page_scale_factor(),
active_tree()->top_controls_shown_ratio(),
active_tree()->elastic_overscroll());
if (pending_tree_)
pending_tree_->DetachLayerTree();
pending_tree_ = nullptr;
if (recycle_tree_)
recycle_tree_->DetachLayerTree();
recycle_tree_ = nullptr;
}
void LayerTreeHostImpl::EnforceManagedMemoryPolicy(
const ManagedMemoryPolicy& policy) {
bool evicted_resources = client_->ReduceContentsTextureMemoryOnImplThread(
visible_ ? policy.bytes_limit_when_visible : 0,
ManagedMemoryPolicy::PriorityCutoffToValue(
visible_ ? policy.priority_cutoff_when_visible
: gpu::MemoryAllocation::CUTOFF_ALLOW_NOTHING));
if (evicted_resources) {
active_tree_->SetContentsTexturesPurged();
if (pending_tree_)
pending_tree_->SetContentsTexturesPurged();
client_->SetNeedsCommitOnImplThread();
client_->OnCanDrawStateChanged(CanDraw());
client_->RenewTreePriority();
}
UpdateTileManagerMemoryPolicy(policy);
}
void LayerTreeHostImpl::UpdateTileManagerMemoryPolicy(
const ManagedMemoryPolicy& policy) {
if (!tile_manager_)
return;
global_tile_state_.hard_memory_limit_in_bytes = 0;
global_tile_state_.soft_memory_limit_in_bytes = 0;
if (visible_ && policy.bytes_limit_when_visible > 0) {
global_tile_state_.hard_memory_limit_in_bytes =
policy.bytes_limit_when_visible;
global_tile_state_.soft_memory_limit_in_bytes =
(static_cast<int64>(global_tile_state_.hard_memory_limit_in_bytes) *
settings_.max_memory_for_prepaint_percentage) /
100;
}
global_tile_state_.memory_limit_policy =
ManagedMemoryPolicy::PriorityCutoffToTileMemoryLimitPolicy(
visible_ ?
policy.priority_cutoff_when_visible :
gpu::MemoryAllocation::CUTOFF_ALLOW_NOTHING);
global_tile_state_.num_resources_limit = policy.num_resources_limit;
// TODO(reveman): We should avoid keeping around unused resources if
// possible. crbug.com/224475
// Unused limit is calculated from soft-limit, as hard-limit may
// be very high and shouldn't typically be exceeded.
size_t unused_memory_limit_in_bytes = static_cast<size_t>(
(static_cast<int64>(global_tile_state_.soft_memory_limit_in_bytes) *
settings_.max_unused_resource_memory_percentage) /
100);
DCHECK(resource_pool_);
resource_pool_->CheckBusyResources(false);
// Soft limit is used for resource pool such that memory returns to soft
// limit after going over.
resource_pool_->SetResourceUsageLimits(
global_tile_state_.soft_memory_limit_in_bytes,
unused_memory_limit_in_bytes,
global_tile_state_.num_resources_limit);
// Release all staging resources when invisible.
if (staging_resource_pool_) {
staging_resource_pool_->CheckBusyResources(false);
staging_resource_pool_->SetResourceUsageLimits(
std::numeric_limits<size_t>::max(),
std::numeric_limits<size_t>::max(),
visible_ ? GetMaxStagingResourceCount() : 0);
}
DidModifyTilePriorities();
}
void LayerTreeHostImpl::DidModifyTilePriorities() {
DCHECK(settings_.impl_side_painting);
// Mark priorities as dirty and schedule a PrepareTiles().
tile_priorities_dirty_ = true;
client_->SetNeedsPrepareTilesOnImplThread();
}
void LayerTreeHostImpl::GetPictureLayerImplPairs(
std::vector<PictureLayerImpl::Pair>* layer_pairs,
bool need_valid_tile_priorities) const {
DCHECK(layer_pairs->empty());
for (auto& layer : active_tree_->picture_layers()) {
if (need_valid_tile_priorities && !layer->HasValidTilePriorities())
continue;
PictureLayerImpl* twin_layer = layer->GetPendingOrActiveTwinLayer();
// Ignore the twin layer when tile priorities are invalid.
if (need_valid_tile_priorities && twin_layer &&
!twin_layer->HasValidTilePriorities()) {
twin_layer = nullptr;
}
layer_pairs->push_back(PictureLayerImpl::Pair(layer, twin_layer));
}
if (pending_tree_) {
for (auto& layer : pending_tree_->picture_layers()) {
if (need_valid_tile_priorities && !layer->HasValidTilePriorities())
continue;
if (PictureLayerImpl* twin_layer = layer->GetPendingOrActiveTwinLayer()) {
if (!need_valid_tile_priorities ||
twin_layer->HasValidTilePriorities()) {
// Already captured from the active tree.
continue;
}
}
layer_pairs->push_back(PictureLayerImpl::Pair(nullptr, layer));
}
}
}
scoped_ptr<RasterTilePriorityQueue> LayerTreeHostImpl::BuildRasterQueue(
TreePriority tree_priority,
RasterTilePriorityQueue::Type type) {
TRACE_EVENT0("cc", "LayerTreeHostImpl::BuildRasterQueue");
picture_layer_pairs_.clear();
GetPictureLayerImplPairs(&picture_layer_pairs_, true);
return RasterTilePriorityQueue::Create(picture_layer_pairs_, tree_priority,
type);
}
scoped_ptr<EvictionTilePriorityQueue> LayerTreeHostImpl::BuildEvictionQueue(
TreePriority tree_priority) {
TRACE_EVENT0("cc", "LayerTreeHostImpl::BuildEvictionQueue");
scoped_ptr<EvictionTilePriorityQueue> queue(new EvictionTilePriorityQueue);
picture_layer_pairs_.clear();
GetPictureLayerImplPairs(&picture_layer_pairs_, false);
queue->Build(picture_layer_pairs_, tree_priority);
return queue;
}
void LayerTreeHostImpl::SetIsLikelyToRequireADraw(
bool is_likely_to_require_a_draw) {
// Proactively tell the scheduler that we expect to draw within each vsync
// until we get all the tiles ready to draw. If we happen to miss a required
// for draw tile here, then we will miss telling the scheduler each frame that
// we intend to draw so it may make worse scheduling decisions.
is_likely_to_require_a_draw_ = is_likely_to_require_a_draw;
}
void LayerTreeHostImpl::NotifyReadyToActivate() {
client_->NotifyReadyToActivate();
}
void LayerTreeHostImpl::NotifyReadyToDraw() {
// Tiles that are ready will cause NotifyTileStateChanged() to be called so we
// don't need to schedule a draw here. Just stop WillBeginImplFrame() from
// causing optimistic requests to draw a frame.
is_likely_to_require_a_draw_ = false;
client_->NotifyReadyToDraw();
}
void LayerTreeHostImpl::NotifyTileStateChanged(const Tile* tile) {
TRACE_EVENT0("cc", "LayerTreeHostImpl::NotifyTileStateChanged");
if (active_tree_) {
LayerImpl* layer_impl =
active_tree_->FindActiveTreeLayerById(tile->layer_id());
if (layer_impl)
layer_impl->NotifyTileStateChanged(tile);
}
if (pending_tree_) {
LayerImpl* layer_impl =
pending_tree_->FindPendingTreeLayerById(tile->layer_id());
if (layer_impl)
layer_impl->NotifyTileStateChanged(tile);
}
// Check for a non-null active tree to avoid doing this during shutdown.
if (active_tree_ && !client_->IsInsideDraw() && tile->required_for_draw()) {
// The LayerImpl::NotifyTileStateChanged() should damage the layer, so this
// redraw will make those tiles be displayed.
SetNeedsRedraw();
}
}
void LayerTreeHostImpl::SetMemoryPolicy(const ManagedMemoryPolicy& policy) {
SetManagedMemoryPolicy(policy, zero_budget_);
}
void LayerTreeHostImpl::SetTreeActivationCallback(
const base::Closure& callback) {
DCHECK(proxy_->IsImplThread());
DCHECK(settings_.impl_side_painting || callback.is_null());
tree_activation_callback_ = callback;
}
void LayerTreeHostImpl::SetManagedMemoryPolicy(
const ManagedMemoryPolicy& policy, bool zero_budget) {
if (cached_managed_memory_policy_ == policy && zero_budget_ == zero_budget)
return;
ManagedMemoryPolicy old_policy = ActualManagedMemoryPolicy();
cached_managed_memory_policy_ = policy;
zero_budget_ = zero_budget;
ManagedMemoryPolicy actual_policy = ActualManagedMemoryPolicy();
if (old_policy == actual_policy)
return;
if (!proxy_->HasImplThread()) {
// In single-thread mode, this can be called on the main thread by
// GLRenderer::OnMemoryAllocationChanged.
DebugScopedSetImplThread impl_thread(proxy_);
EnforceManagedMemoryPolicy(actual_policy);
} else {
DCHECK(proxy_->IsImplThread());
EnforceManagedMemoryPolicy(actual_policy);
}
// If there is already enough memory to draw everything imaginable and the
// new memory limit does not change this, then do not re-commit. Don't bother
// skipping commits if this is not visible (commits don't happen when not
// visible, there will almost always be a commit when this becomes visible).
bool needs_commit = true;
if (visible() &&
actual_policy.bytes_limit_when_visible >= max_memory_needed_bytes_ &&
old_policy.bytes_limit_when_visible >= max_memory_needed_bytes_ &&
actual_policy.priority_cutoff_when_visible ==
old_policy.priority_cutoff_when_visible) {
needs_commit = false;
}
if (needs_commit)
client_->SetNeedsCommitOnImplThread();
}
void LayerTreeHostImpl::SetExternalDrawConstraints(
const gfx::Transform& transform,
const gfx::Rect& viewport,
const gfx::Rect& clip,
const gfx::Rect& viewport_rect_for_tile_priority,
const gfx::Transform& transform_for_tile_priority,
bool resourceless_software_draw) {
gfx::Rect viewport_rect_for_tile_priority_in_view_space;
if (!resourceless_software_draw) {
gfx::Transform screen_to_view(gfx::Transform::kSkipInitialization);
if (transform_for_tile_priority.GetInverse(&screen_to_view)) {
// Convert from screen space to view space.
viewport_rect_for_tile_priority_in_view_space =
gfx::ToEnclosingRect(MathUtil::ProjectClippedRect(
screen_to_view, viewport_rect_for_tile_priority));
}
}
if (external_transform_ != transform || external_viewport_ != viewport ||
resourceless_software_draw_ != resourceless_software_draw ||
viewport_rect_for_tile_priority_ !=
viewport_rect_for_tile_priority_in_view_space) {
active_tree_->set_needs_update_draw_properties();
}
external_transform_ = transform;
external_viewport_ = viewport;
external_clip_ = clip;
viewport_rect_for_tile_priority_ =
viewport_rect_for_tile_priority_in_view_space;
resourceless_software_draw_ = resourceless_software_draw;
}
void LayerTreeHostImpl::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
if (damage_rect.IsEmpty())
return;
NotifySwapPromiseMonitorsOfSetNeedsRedraw();
client_->SetNeedsRedrawRectOnImplThread(damage_rect);
}
void LayerTreeHostImpl::DidSwapBuffers() {
client_->DidSwapBuffersOnImplThread();
}
void LayerTreeHostImpl::DidSwapBuffersComplete() {
client_->DidSwapBuffersCompleteOnImplThread();
}
void LayerTreeHostImpl::ReclaimResources(const CompositorFrameAck* ack) {
// TODO(piman): We may need to do some validation on this ack before
// processing it.
if (renderer_)
renderer_->ReceiveSwapBuffersAck(*ack);
// In OOM, we now might be able to release more resources that were held
// because they were exported.
if (tile_manager_) {
DCHECK(resource_pool_);
resource_pool_->CheckBusyResources(false);
resource_pool_->ReduceResourceUsage();
}
// If we're not visible, we likely released resources, so we want to
// aggressively flush here to make sure those DeleteTextures make it to the
// GPU process to free up the memory.
if (output_surface_->context_provider() && !visible_) {
output_surface_->context_provider()->ContextGL()->ShallowFlushCHROMIUM();
}
}
void LayerTreeHostImpl::OnCanDrawStateChangedForTree() {
client_->OnCanDrawStateChanged(CanDraw());
}
CompositorFrameMetadata LayerTreeHostImpl::MakeCompositorFrameMetadata() const {
CompositorFrameMetadata metadata;
metadata.device_scale_factor = device_scale_factor_;
metadata.page_scale_factor = active_tree_->current_page_scale_factor();
metadata.scrollable_viewport_size = active_tree_->ScrollableViewportSize();
metadata.root_layer_size = active_tree_->ScrollableSize();
metadata.min_page_scale_factor = active_tree_->min_page_scale_factor();
metadata.max_page_scale_factor = active_tree_->max_page_scale_factor();
metadata.location_bar_offset =
gfx::Vector2dF(0.f, top_controls_manager_->ControlsTopOffset());
metadata.location_bar_content_translation =
gfx::Vector2dF(0.f, top_controls_manager_->ContentTopOffset());
active_tree_->GetViewportSelection(&metadata.selection_start,
&metadata.selection_end);
LayerImpl* root_layer_for_overflow = OuterViewportScrollLayer()
? OuterViewportScrollLayer()
: InnerViewportScrollLayer();
if (root_layer_for_overflow) {
metadata.root_overflow_x_hidden =
!root_layer_for_overflow->user_scrollable_horizontal();
metadata.root_overflow_y_hidden =
!root_layer_for_overflow->user_scrollable_vertical();
}
if (!InnerViewportScrollLayer())
return metadata;
// TODO(miletus) : Change the metadata to hold ScrollOffset.
metadata.root_scroll_offset = gfx::ScrollOffsetToVector2dF(
active_tree_->TotalScrollOffset());
return metadata;
}
void LayerTreeHostImpl::DrawLayers(FrameData* frame,
base::TimeTicks frame_begin_time) {
TRACE_EVENT0("cc", "LayerTreeHostImpl::DrawLayers");
DCHECK(CanDraw());
if (!frame->composite_events.empty()) {
frame_timing_tracker_->SaveTimeStamps(frame_begin_time,
frame->composite_events);
}
if (frame->has_no_damage) {
TRACE_EVENT_INSTANT0("cc", "EarlyOut_NoDamage", TRACE_EVENT_SCOPE_THREAD);
DCHECK(!output_surface_->capabilities()
.draw_and_swap_full_viewport_every_frame);
return;
}
DCHECK(!frame->render_passes.empty());
fps_counter_->SaveTimeStamp(frame_begin_time,
!output_surface_->context_provider());
rendering_stats_instrumentation_->IncrementFrameCount(1);
if (tile_manager_) {
memory_history_->SaveEntry(
tile_manager_->memory_stats_from_last_assign());
}
if (debug_state_.ShowHudRects()) {
debug_rect_history_->SaveDebugRectsForCurrentFrame(
active_tree_->root_layer(),
active_tree_->hud_layer(),
*frame->render_surface_layer_list,
debug_state_);
}
if (!settings_.impl_side_painting && debug_state_.continuous_painting) {
const RenderingStats& stats =
rendering_stats_instrumentation_->GetRenderingStats();
paint_time_counter_->SavePaintTime(
stats.begin_main_frame_to_commit_duration.GetLastTimeDelta());
}
bool is_new_trace;
TRACE_EVENT_IS_NEW_TRACE(&is_new_trace);
if (is_new_trace) {
if (pending_tree_) {
LayerTreeHostCommon::CallFunctionForSubtree(
pending_tree_->root_layer(),
[](LayerImpl* layer) { layer->DidBeginTracing(); });
}
LayerTreeHostCommon::CallFunctionForSubtree(
active_tree_->root_layer(),
[](LayerImpl* layer) { layer->DidBeginTracing(); });
}
{
TRACE_EVENT0("cc", "DrawLayers.FrameViewerTracing");
TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
frame_viewer_instrumentation::kCategoryLayerTree,
"cc::LayerTreeHostImpl", id_, AsValueWithFrame(frame));
}
const DrawMode draw_mode = GetDrawMode();
// Because the contents of the HUD depend on everything else in the frame, the
// contents of its texture are updated as the last thing before the frame is
// drawn.
if (active_tree_->hud_layer()) {
TRACE_EVENT0("cc", "DrawLayers.UpdateHudTexture");
active_tree_->hud_layer()->UpdateHudTexture(draw_mode,
resource_provider_.get());
}
if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE) {
bool disable_picture_quad_image_filtering =
IsActivelyScrolling() || animation_registrar_->needs_animate_layers();
scoped_ptr<SoftwareRenderer> temp_software_renderer =
SoftwareRenderer::Create(this, &settings_.renderer_settings,
output_surface_.get(), NULL);
temp_software_renderer->DrawFrame(&frame->render_passes,
device_scale_factor_,
DeviceViewport(),
DeviceClip(),
disable_picture_quad_image_filtering);
} else {
renderer_->DrawFrame(&frame->render_passes,
device_scale_factor_,
DeviceViewport(),
DeviceClip(),
false);
}
// The render passes should be consumed by the renderer.
DCHECK(frame->render_passes.empty());
frame->render_passes_by_id.clear();
// The next frame should start by assuming nothing has changed, and changes
// are noted as they occur.
// TODO(boliu): If we did a temporary software renderer frame, propogate the
// damage forward to the next frame.
for (size_t i = 0; i < frame->render_surface_layer_list->size(); i++) {
(*frame->render_surface_layer_list)[i]->render_surface()->damage_tracker()->
DidDrawDamagedArea();
}
active_tree_->root_layer()->ResetAllChangeTrackingForSubtree();
active_tree_->set_has_ever_been_drawn(true);
devtools_instrumentation::DidDrawFrame(id_);
benchmark_instrumentation::IssueImplThreadRenderingStatsEvent(
rendering_stats_instrumentation_->impl_thread_rendering_stats());
rendering_stats_instrumentation_->AccumulateAndClearImplThreadStats();
}
void LayerTreeHostImpl::DidDrawAllLayers(const FrameData& frame) {
for (size_t i = 0; i < frame.will_draw_layers.size(); ++i)
frame.will_draw_layers[i]->DidDraw(resource_provider_.get());
// Once all layers have been drawn, pending texture uploads should no
// longer block future uploads.
resource_provider_->MarkPendingUploadsAsNonBlocking();
}
void LayerTreeHostImpl::FinishAllRendering() {
if (renderer_)
renderer_->Finish();
}
void LayerTreeHostImpl::SetUseGpuRasterization(bool use_gpu) {
if (use_gpu == use_gpu_rasterization_)
return;
// Note that this must happen first, in case the rest of the calls want to
// query the new state of |use_gpu_rasterization_|.
use_gpu_rasterization_ = use_gpu;
// Clean up and replace existing tile manager with another one that uses
// appropriate rasterizer.
ReleaseTreeResources();
if (tile_manager_) {
DestroyTileManager();
CreateAndSetTileManager();
}
RecreateTreeResources();
// We have released tilings for both active and pending tree.
// We would not have any content to draw until the pending tree is activated.
// Prevent the active tree from drawing until activation.
SetRequiresHighResToDraw();
}
const RendererCapabilitiesImpl&
LayerTreeHostImpl::GetRendererCapabilities() const {
return renderer_->Capabilities();
}
bool LayerTreeHostImpl::SwapBuffers(const LayerTreeHostImpl::FrameData& frame) {
ResetRequiresHighResToDraw();
if (frame.has_no_damage) {
active_tree()->BreakSwapPromises(SwapPromise::SWAP_FAILS);
return false;
}
CompositorFrameMetadata metadata = MakeCompositorFrameMetadata();
active_tree()->FinishSwapPromises(&metadata);
for (auto& latency : metadata.latency_info) {
TRACE_EVENT_FLOW_STEP0(
"input,benchmark",
"LatencyInfo.Flow",
TRACE_ID_DONT_MANGLE(latency.trace_id),
"SwapBuffers");
// Only add the latency component once for renderer swap, not the browser
// swap.
if (!latency.FindLatency(ui::INPUT_EVENT_LATENCY_RENDERER_SWAP_COMPONENT,
0, nullptr)) {
latency.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_RENDERER_SWAP_COMPONENT,
0, 0);
}
}
renderer_->SwapBuffers(metadata);
return true;
}
void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
// Sample the frame time now. This time will be used for updating animations
// when we draw.
UpdateCurrentBeginFrameArgs(args);
// Cache the begin impl frame interval
begin_impl_frame_interval_ = args.interval;
if (is_likely_to_require_a_draw_) {
// Optimistically schedule a draw. This will let us expect the tile manager
// to complete its work so that we can draw new tiles within the impl frame
// we are beginning now.
SetNeedsRedraw();
}
}
void LayerTreeHostImpl::UpdateViewportContainerSizes() {
LayerImpl* inner_container = active_tree_->InnerViewportContainerLayer();
LayerImpl* outer_container = active_tree_->OuterViewportContainerLayer();
if (!inner_container)
return;
// TODO(bokan): This code is currently specific to top controls. It should be
// made general. crbug.com/464814.
if (!TopControlsHeight()) {
if (outer_container)
outer_container->SetBoundsDelta(gfx::Vector2dF());
inner_container->SetBoundsDelta(gfx::Vector2dF());
active_tree_->InnerViewportScrollLayer()->SetBoundsDelta(gfx::Vector2dF());
return;
}
ViewportAnchor anchor(InnerViewportScrollLayer(),
OuterViewportScrollLayer());
// Adjust the inner viewport by shrinking/expanding the container to account
// for the change in top controls height since the last Resize from Blink.
float top_controls_layout_height =
active_tree_->top_controls_shrink_blink_size()
? active_tree_->top_controls_height()
: 0.f;
inner_container->SetBoundsDelta(gfx::Vector2dF(
0,
top_controls_layout_height - top_controls_manager_->ContentTopOffset()));
if (!outer_container || outer_container->BoundsForScrolling().IsEmpty())
return;
// Adjust the outer viewport container as well, since adjusting only the
// inner may cause its bounds to exceed those of the outer, causing scroll
// clamping. We adjust it so it maintains the same aspect ratio as the
// inner viewport.
float aspect_ratio = inner_container->BoundsForScrolling().width() /
inner_container->BoundsForScrolling().height();
float target_height = outer_container->BoundsForScrolling().width() /
aspect_ratio;
float current_outer_height = outer_container->BoundsForScrolling().height() -
outer_container->bounds_delta().y();
gfx::Vector2dF delta(0, target_height - current_outer_height);
outer_container->SetBoundsDelta(delta);
active_tree_->InnerViewportScrollLayer()->SetBoundsDelta(delta);
anchor.ResetViewportToAnchoredPosition();
}
void LayerTreeHostImpl::SynchronouslyInitializeAllTiles() {
// Only valid for the single-threaded non-scheduled/synchronous case
// using the zero copy raster worker pool.
if (tile_manager_)
single_thread_synchronous_task_graph_runner_->RunUntilIdle();
}
void LayerTreeHostImpl::DidLoseOutputSurface() {
if (resource_provider_)
resource_provider_->DidLoseOutputSurface();
client_->DidLoseOutputSurfaceOnImplThread();
}
bool LayerTreeHostImpl::HaveRootScrollLayer() const {
return !!InnerViewportScrollLayer();
}
LayerImpl* LayerTreeHostImpl::RootLayer() const {
return active_tree_->root_layer();
}
LayerImpl* LayerTreeHostImpl::InnerViewportScrollLayer() const {
return active_tree_->InnerViewportScrollLayer();
}
LayerImpl* LayerTreeHostImpl::OuterViewportScrollLayer() const {
return active_tree_->OuterViewportScrollLayer();
}
LayerImpl* LayerTreeHostImpl::CurrentlyScrollingLayer() const {
return active_tree_->CurrentlyScrollingLayer();
}
bool LayerTreeHostImpl::IsActivelyScrolling() const {
return (did_lock_scrolling_layer_ && CurrentlyScrollingLayer()) ||
(InnerViewportScrollLayer() &&
InnerViewportScrollLayer()->IsExternalFlingActive()) ||
(OuterViewportScrollLayer() &&
OuterViewportScrollLayer()->IsExternalFlingActive());
}
// Content layers can be either directly scrollable or contained in an outer
// scrolling layer which applies the scroll transform. Given a content layer,
// this function returns the associated scroll layer if any.
static LayerImpl* FindScrollLayerForContentLayer(LayerImpl* layer_impl) {
if (!layer_impl)
return NULL;
if (layer_impl->scrollable())
return layer_impl;
if (layer_impl->DrawsContent() &&
layer_impl->parent() &&
layer_impl->parent()->scrollable())
return layer_impl->parent();
return NULL;
}
void LayerTreeHostImpl::CreatePendingTree() {
CHECK(!pending_tree_);
if (recycle_tree_)
recycle_tree_.swap(pending_tree_);
else
pending_tree_ =
LayerTreeImpl::create(this, active_tree()->page_scale_factor(),
active_tree()->top_controls_shown_ratio(),
active_tree()->elastic_overscroll());
client_->OnCanDrawStateChanged(CanDraw());
TRACE_EVENT_ASYNC_BEGIN0("cc", "PendingTree:waiting", pending_tree_.get());
}
void LayerTreeHostImpl::ActivateSyncTree() {
if (pending_tree_) {
TRACE_EVENT_ASYNC_END0("cc", "PendingTree:waiting", pending_tree_.get());
active_tree_->SetRootLayerScrollOffsetDelegate(NULL);
active_tree_->PushPersistedState(pending_tree_.get());
// Process any requests in the UI resource queue. The request queue is
// given in LayerTreeHost::FinishCommitOnImplThread. This must take place
// before the swap.
pending_tree_->ProcessUIResourceRequestQueue();
if (pending_tree_->needs_full_tree_sync()) {
active_tree_->SetRootLayer(
TreeSynchronizer::SynchronizeTrees(pending_tree_->root_layer(),
active_tree_->DetachLayerTree(),
active_tree_.get()));
}
TreeSynchronizer::PushProperties(pending_tree_->root_layer(),
active_tree_->root_layer());
pending_tree_->PushPropertiesTo(active_tree_.get());
// Now that we've synced everything from the pending tree to the active
// tree, rename the pending tree the recycle tree so we can reuse it on the
// next sync.
DCHECK(!recycle_tree_);
pending_tree_.swap(recycle_tree_);
active_tree_->SetRootLayerScrollOffsetDelegate(
root_layer_scroll_offset_delegate_);
UpdateViewportContainerSizes();
} else {
active_tree_->ProcessUIResourceRequestQueue();
}
active_tree_->DidBecomeActive();
ActivateAnimations();
if (settings_.impl_side_painting) {
client_->RenewTreePriority();
// If we have any picture layers, then by activating we also modified tile
// priorities.
if (!active_tree_->picture_layers().empty())
DidModifyTilePriorities();
}
client_->OnCanDrawStateChanged(CanDraw());
client_->DidActivateSyncTree();
if (!tree_activation_callback_.is_null())
tree_activation_callback_.Run();
if (debug_state_.continuous_painting) {
const RenderingStats& stats =
rendering_stats_instrumentation_->GetRenderingStats();
// TODO(hendrikw): This requires a different metric when we commit directly
// to the active tree. See crbug.com/429311.
paint_time_counter_->SavePaintTime(
stats.commit_to_activate_duration.GetLastTimeDelta() +
stats.draw_duration.GetLastTimeDelta());
}
scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation =
active_tree_->TakePendingPageScaleAnimation();
if (pending_page_scale_animation) {
StartPageScaleAnimation(
pending_page_scale_animation->target_offset,
pending_page_scale_animation->use_anchor,
pending_page_scale_animation->scale,
pending_page_scale_animation->duration);
}
}
void LayerTreeHostImpl::SetVisible(bool visible) {
DCHECK(proxy_->IsImplThread());
if (visible_ == visible)
return;
visible_ = visible;
DidVisibilityChange(this, visible_);
EnforceManagedMemoryPolicy(ActualManagedMemoryPolicy());
// If we just became visible, we have to ensure that we draw high res tiles,
// to prevent checkerboard/low res flashes.
if (visible_)
SetRequiresHighResToDraw();
else
EvictAllUIResources();
// Evict tiles immediately if invisible since this tab may never get another
// draw or timer tick.
if (!visible_)
PrepareTiles();
if (!renderer_)
return;
renderer_->SetVisible(visible);
}
void LayerTreeHostImpl::SetNeedsAnimate() {
NotifySwapPromiseMonitorsOfSetNeedsRedraw();
client_->SetNeedsAnimateOnImplThread();
}
void LayerTreeHostImpl::SetNeedsRedraw() {
NotifySwapPromiseMonitorsOfSetNeedsRedraw();
client_->SetNeedsRedrawOnImplThread();
}
ManagedMemoryPolicy LayerTreeHostImpl::ActualManagedMemoryPolicy() const {
ManagedMemoryPolicy actual = cached_managed_memory_policy_;
if (debug_state_.rasterize_only_visible_content) {
actual.priority_cutoff_when_visible =
gpu::MemoryAllocation::CUTOFF_ALLOW_REQUIRED_ONLY;
} else if (use_gpu_rasterization()) {
actual.priority_cutoff_when_visible =
gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
}
if (zero_budget_) {
actual.bytes_limit_when_visible = 0;
}
return actual;
}
size_t LayerTreeHostImpl::memory_allocation_limit_bytes() const {
return ActualManagedMemoryPolicy().bytes_limit_when_visible;
}
int LayerTreeHostImpl::memory_allocation_priority_cutoff() const {
return ManagedMemoryPolicy::PriorityCutoffToValue(
ActualManagedMemoryPolicy().priority_cutoff_when_visible);
}
void LayerTreeHostImpl::ReleaseTreeResources() {
active_tree_->ReleaseResources();
if (pending_tree_)
pending_tree_->ReleaseResources();
if (recycle_tree_)
recycle_tree_->ReleaseResources();
EvictAllUIResources();
}
void LayerTreeHostImpl::RecreateTreeResources() {
active_tree_->RecreateResources();
if (pending_tree_)
pending_tree_->RecreateResources();
if (recycle_tree_)
recycle_tree_->RecreateResources();
}
void LayerTreeHostImpl::CreateAndSetRenderer() {
DCHECK(!renderer_);
DCHECK(output_surface_);
DCHECK(resource_provider_);
if (output_surface_->capabilities().delegated_rendering) {
renderer_ = DelegatingRenderer::Create(this, &settings_.renderer_settings,
output_surface_.get(),
resource_provider_.get());
} else if (output_surface_->context_provider()) {
renderer_ = GLRenderer::Create(
this, &settings_.renderer_settings, output_surface_.get(),
resource_provider_.get(), texture_mailbox_deleter_.get(),
settings_.renderer_settings.highp_threshold_min);
} else if (output_surface_->software_device()) {
renderer_ = SoftwareRenderer::Create(this, &settings_.renderer_settings,
output_surface_.get(),
resource_provider_.get());
}
DCHECK(renderer_);
renderer_->SetVisible(visible_);
SetFullRootLayerDamage();
// See note in LayerTreeImpl::UpdateDrawProperties. Renderer needs to be
// initialized to get max texture size. Also, after releasing resources,
// trees need another update to generate new ones.
active_tree_->set_needs_update_draw_properties();
if (pending_tree_)
pending_tree_->set_needs_update_draw_properties();
client_->UpdateRendererCapabilitiesOnImplThread();
}
void LayerTreeHostImpl::CreateAndSetTileManager() {
DCHECK(!tile_manager_);
DCHECK(settings_.impl_side_painting);
DCHECK(output_surface_);
DCHECK(resource_provider_);
rasterizer_ = CreateRasterizer();
CreateResourceAndTileTaskWorkerPool(&tile_task_worker_pool_, &resource_pool_,
&staging_resource_pool_);
DCHECK(tile_task_worker_pool_);
DCHECK(resource_pool_);
base::SingleThreadTaskRunner* task_runner =
proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
: proxy_->MainThreadTaskRunner();
DCHECK(task_runner);
size_t scheduled_raster_task_limit =
IsSynchronousSingleThreaded() ? std::numeric_limits<size_t>::max()
: settings_.scheduled_raster_task_limit;
tile_manager_ =
TileManager::Create(this, task_runner, resource_pool_.get(),
tile_task_worker_pool_->AsTileTaskRunner(),
rasterizer_.get(), scheduled_raster_task_limit);
UpdateTileManagerMemoryPolicy(ActualManagedMemoryPolicy());
}
scoped_ptr<Rasterizer> LayerTreeHostImpl::CreateRasterizer() {
ContextProvider* context_provider = output_surface_->context_provider();
if (use_gpu_rasterization_ && context_provider) {
return GpuRasterizer::Create(context_provider, resource_provider_.get(),
settings_.use_distance_field_text,
settings_.threaded_gpu_rasterization_enabled,
settings_.gpu_rasterization_msaa_sample_count);
}
return SoftwareRasterizer::Create();
}
void LayerTreeHostImpl::CreateResourceAndTileTaskWorkerPool(
scoped_ptr<TileTaskWorkerPool>* tile_task_worker_pool,
scoped_ptr<ResourcePool>* resource_pool,
scoped_ptr<ResourcePool>* staging_resource_pool) {
base::SingleThreadTaskRunner* task_runner =
proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
: proxy_->MainThreadTaskRunner();
DCHECK(task_runner);
ContextProvider* context_provider = output_surface_->context_provider();
if (!context_provider) {
*resource_pool =
ResourcePool::Create(resource_provider_.get(), GL_TEXTURE_2D);
*tile_task_worker_pool = BitmapTileTaskWorkerPool::Create(
task_runner, TileTaskWorkerPool::GetTaskGraphRunner(),
resource_provider_.get());
return;
}
if (use_gpu_rasterization_) {
*resource_pool =
ResourcePool::Create(resource_provider_.get(), GL_TEXTURE_2D);
*tile_task_worker_pool = GpuTileTaskWorkerPool::Create(
task_runner, TileTaskWorkerPool::GetTaskGraphRunner(),
static_cast<GpuRasterizer*>(rasterizer_.get()));
return;
}
if (GetRendererCapabilities().using_image) {
unsigned image_target = settings_.use_image_texture_target;
DCHECK_IMPLIES(
image_target == GL_TEXTURE_RECTANGLE_ARB,
context_provider->ContextCapabilities().gpu.texture_rectangle);
DCHECK_IMPLIES(
image_target == GL_TEXTURE_EXTERNAL_OES,
context_provider->ContextCapabilities().gpu.egl_image_external);
if (settings_.use_zero_copy || IsSynchronousSingleThreaded()) {
*resource_pool =
ResourcePool::Create(resource_provider_.get(), image_target);
TaskGraphRunner* task_graph_runner;
if (IsSynchronousSingleThreaded()) {
DCHECK(!single_thread_synchronous_task_graph_runner_);
single_thread_synchronous_task_graph_runner_.reset(new TaskGraphRunner);
task_graph_runner = single_thread_synchronous_task_graph_runner_.get();
} else {
task_graph_runner = TileTaskWorkerPool::GetTaskGraphRunner();
}
*tile_task_worker_pool = ZeroCopyTileTaskWorkerPool::Create(
task_runner, task_graph_runner, resource_provider_.get());
return;
}
if (settings_.use_one_copy) {
// We need to create a staging resource pool when using copy rasterizer.
*staging_resource_pool =
ResourcePool::Create(resource_provider_.get(), image_target);
*resource_pool =
ResourcePool::Create(resource_provider_.get(), GL_TEXTURE_2D);
*tile_task_worker_pool = OneCopyTileTaskWorkerPool::Create(
task_runner, TileTaskWorkerPool::GetTaskGraphRunner(),
context_provider, resource_provider_.get(),
staging_resource_pool_.get());
return;
}
}
// Synchronous single-threaded mode depends on tiles being ready to
// draw when raster is complete. Therefore, it must use one of zero
// copy, software raster, or GPU raster (in the branches above).
DCHECK(!IsSynchronousSingleThreaded());
*resource_pool = ResourcePool::Create(
resource_provider_.get(), GL_TEXTURE_2D);
*tile_task_worker_pool = PixelBufferTileTaskWorkerPool::Create(
task_runner, TileTaskWorkerPool::GetTaskGraphRunner(), context_provider,
resource_provider_.get(),
GetMaxTransferBufferUsageBytes(context_provider->ContextCapabilities(),
settings_.renderer_settings.refresh_rate));
}
void LayerTreeHostImpl::DestroyTileManager() {
tile_manager_ = nullptr;
resource_pool_ = nullptr;
staging_resource_pool_ = nullptr;
tile_task_worker_pool_ = nullptr;
rasterizer_ = nullptr;
single_thread_synchronous_task_graph_runner_ = nullptr;
}
bool LayerTreeHostImpl::IsSynchronousSingleThreaded() const {
return !proxy_->HasImplThread() && !settings_.single_thread_proxy_scheduler;
}
void LayerTreeHostImpl::EnforceZeroBudget(bool zero_budget) {
SetManagedMemoryPolicy(cached_managed_memory_policy_, zero_budget);
}
bool LayerTreeHostImpl::InitializeRenderer(
scoped_ptr<OutputSurface> output_surface) {
TRACE_EVENT0("cc", "LayerTreeHostImpl::InitializeRenderer");
// Since we will create a new resource provider, we cannot continue to use
// the old resources (i.e. render_surfaces and texture IDs). Clear them
// before we destroy the old resource provider.
ReleaseTreeResources();
// Note: order is important here.
renderer_ = nullptr;
DestroyTileManager();
resource_provider_ = nullptr;
output_surface_ = nullptr;
if (!output_surface->BindToClient(this)) {
// Avoid recreating tree resources because we might not have enough
// information to do this yet (eg. we don't have a TileManager at this
// point).
return false;
}
output_surface_ = output_surface.Pass();
resource_provider_ = ResourceProvider::Create(
output_surface_.get(), shared_bitmap_manager_, gpu_memory_buffer_manager_,
proxy_->blocking_main_thread_task_runner(),
settings_.renderer_settings.highp_threshold_min,
settings_.renderer_settings.use_rgba_4444_textures,
settings_.renderer_settings.texture_id_allocation_chunk_size);
if (output_surface_->capabilities().deferred_gl_initialization)
EnforceZeroBudget(true);
CreateAndSetRenderer();
if (settings_.impl_side_painting && settings_.raster_enabled)
CreateAndSetTileManager();
RecreateTreeResources();
// Initialize vsync parameters to sane values.
const base::TimeDelta display_refresh_interval =
base::TimeDelta::FromMicroseconds(
base::Time::kMicrosecondsPerSecond /
settings_.renderer_settings.refresh_rate);
CommitVSyncParameters(base::TimeTicks(), display_refresh_interval);
// TODO(brianderson): Don't use a hard-coded parent draw time.
base::TimeDelta parent_draw_time =
(!settings_.use_external_begin_frame_source &&
output_surface_->capabilities().adjust_deadline_for_parent)
? BeginFrameArgs::DefaultEstimatedParentDrawTime()
: base::TimeDelta();
client_->SetEstimatedParentDrawTime(parent_draw_time);
int max_frames_pending = output_surface_->capabilities().max_frames_pending;
if (max_frames_pending <= 0)
max_frames_pending = OutputSurface::DEFAULT_MAX_FRAMES_PENDING;
client_->SetMaxSwapsPendingOnImplThread(max_frames_pending);
client_->OnCanDrawStateChanged(CanDraw());
// There will not be anything to draw here, so set high res
// to avoid checkerboards, typically when we are recovering
// from lost context.
SetRequiresHighResToDraw();
return true;
}
void LayerTreeHostImpl::CommitVSyncParameters(base::TimeTicks timebase,
base::TimeDelta interval) {
client_->CommitVSyncParameters(timebase, interval);
}
void LayerTreeHostImpl::DeferredInitialize() {
DCHECK(output_surface_->capabilities().deferred_gl_initialization);
DCHECK(settings_.impl_side_painting);
DCHECK(output_surface_->context_provider());
ReleaseTreeResources();
renderer_ = nullptr;
DestroyTileManager();
resource_provider_->InitializeGL();
CreateAndSetRenderer();
EnforceZeroBudget(false);
CreateAndSetTileManager();
RecreateTreeResources();
client_->SetNeedsCommitOnImplThread();
}
void LayerTreeHostImpl::ReleaseGL() {
DCHECK(output_surface_->capabilities().deferred_gl_initialization);
DCHECK(settings_.impl_side_painting);
DCHECK(output_surface_->context_provider());
ReleaseTreeResources();
renderer_ = nullptr;
DestroyTileManager();
resource_provider_->InitializeSoftware();
output_surface_->ReleaseContextProvider();
CreateAndSetRenderer();
EnforceZeroBudget(true);
CreateAndSetTileManager();
RecreateTreeResources();
client_->SetNeedsCommitOnImplThread();
}
void LayerTreeHostImpl::SetViewportSize(const gfx::Size& device_viewport_size) {
if (device_viewport_size == device_viewport_size_)
return;
TRACE_EVENT_INSTANT2("cc", "LayerTreeHostImpl::SetViewportSize",
TRACE_EVENT_SCOPE_THREAD, "width",
device_viewport_size.width(), "height",
device_viewport_size.height());
if (pending_tree_)
active_tree_->SetViewportSizeInvalid();
device_viewport_size_ = device_viewport_size;
UpdateViewportContainerSizes();
client_->OnCanDrawStateChanged(CanDraw());
SetFullRootLayerDamage();
active_tree_->set_needs_update_draw_properties();
}
void LayerTreeHostImpl::SetDeviceScaleFactor(float device_scale_factor) {
if (device_scale_factor == device_scale_factor_)
return;
device_scale_factor_ = device_scale_factor;
SetFullRootLayerDamage();
}
void LayerTreeHostImpl::SetPageScaleOnActiveTree(float page_scale_factor) {
active_tree_->SetPageScaleOnActiveTree(page_scale_factor);
}
const gfx::Rect LayerTreeHostImpl::ViewportRectForTilePriority() const {
if (viewport_rect_for_tile_priority_.IsEmpty())
return DeviceViewport();
return viewport_rect_for_tile_priority_;
}
gfx::Size LayerTreeHostImpl::DrawViewportSize() const {
return DeviceViewport().size();
}
gfx::Rect LayerTreeHostImpl::DeviceViewport() const {
if (external_viewport_.IsEmpty())
return gfx::Rect(device_viewport_size_);
return external_viewport_;
}
gfx::Rect LayerTreeHostImpl::DeviceClip() const {
if (external_clip_.IsEmpty())
return DeviceViewport();
return external_clip_;
}
const gfx::Transform& LayerTreeHostImpl::DrawTransform() const {
return external_transform_;
}
void LayerTreeHostImpl::DidChangeTopControlsPosition() {
UpdateViewportContainerSizes();
SetNeedsRedraw();
SetNeedsAnimate();
active_tree_->set_needs_update_draw_properties();
SetFullRootLayerDamage();
}
float LayerTreeHostImpl::TopControlsHeight() const {
return active_tree_->top_controls_height();
}
void LayerTreeHostImpl::SetCurrentTopControlsShownRatio(float ratio) {
if (active_tree_->SetCurrentTopControlsShownRatio(ratio))
DidChangeTopControlsPosition();
}
float LayerTreeHostImpl::CurrentTopControlsShownRatio() const {
return active_tree_->CurrentTopControlsShownRatio();
}
void LayerTreeHostImpl::BindToClient(InputHandlerClient* client) {
DCHECK(input_handler_client_ == NULL);
input_handler_client_ = client;
}
LayerImpl* LayerTreeHostImpl::FindScrollLayerForDeviceViewportPoint(
const gfx::PointF& device_viewport_point,
InputHandler::ScrollInputType type,
LayerImpl* layer_impl,
bool* scroll_on_main_thread,
bool* optional_has_ancestor_scroll_handler) const {
DCHECK(scroll_on_main_thread);
ScrollBlocksOn block_mode = EffectiveScrollBlocksOn(layer_impl);
// Walk up the hierarchy and look for a scrollable layer.
LayerImpl* potentially_scrolling_layer_impl = NULL;
for (; layer_impl; layer_impl = NextScrollLayer(layer_impl)) {
// The content layer can also block attempts to scroll outside the main
// thread.
ScrollStatus status =
layer_impl->TryScroll(device_viewport_point, type, block_mode);
if (status == SCROLL_ON_MAIN_THREAD) {
*scroll_on_main_thread = true;
return NULL;
}
LayerImpl* scroll_layer_impl = FindScrollLayerForContentLayer(layer_impl);
if (!scroll_layer_impl)
continue;
status =
scroll_layer_impl->TryScroll(device_viewport_point, type, block_mode);
// If any layer wants to divert the scroll event to the main thread, abort.
if (status == SCROLL_ON_MAIN_THREAD) {
*scroll_on_main_thread = true;
return NULL;
}
if (optional_has_ancestor_scroll_handler &&
scroll_layer_impl->have_scroll_event_handlers())
*optional_has_ancestor_scroll_handler = true;
if (status == SCROLL_STARTED && !potentially_scrolling_layer_impl)
potentially_scrolling_layer_impl = scroll_layer_impl;
}
// Falling back to the root scroll layer ensures generation of root overscroll
// notifications while preventing scroll updates from being unintentionally
// forwarded to the main thread.
if (!potentially_scrolling_layer_impl)
potentially_scrolling_layer_impl = OuterViewportScrollLayer()
? OuterViewportScrollLayer()
: InnerViewportScrollLayer();
return potentially_scrolling_layer_impl;
}
// Similar to LayerImpl::HasAncestor, but walks up the scroll parents.
static bool HasScrollAncestor(LayerImpl* child, LayerImpl* scroll_ancestor) {
DCHECK(scroll_ancestor);
for (LayerImpl* ancestor = child; ancestor;
ancestor = NextScrollLayer(ancestor)) {
if (ancestor->scrollable())
return ancestor == scroll_ancestor;
}
return false;
}
InputHandler::ScrollStatus LayerTreeHostImpl::ScrollBegin(
const gfx::Point& viewport_point,
InputHandler::ScrollInputType type) {
TRACE_EVENT0("cc", "LayerTreeHostImpl::ScrollBegin");
top_controls_manager_->ScrollBegin();
DCHECK(!CurrentlyScrollingLayer());
ClearCurrentlyScrollingLayer();
gfx::PointF device_viewport_point = gfx::ScalePoint(viewport_point,
device_scale_factor_);
LayerImpl* layer_impl =
active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
if (layer_impl) {
LayerImpl* scroll_layer_impl =
active_tree_->FindFirstScrollingLayerThatIsHitByPoint(
device_viewport_point);
if (scroll_layer_impl && !HasScrollAncestor(layer_impl, scroll_layer_impl))
return SCROLL_UNKNOWN;
}
bool scroll_on_main_thread = false;
LayerImpl* scrolling_layer_impl =
FindScrollLayerForDeviceViewportPoint(device_viewport_point,
type,
layer_impl,
&scroll_on_main_thread,
&scroll_affects_scroll_handler_);
if (scroll_on_main_thread) {
UMA_HISTOGRAM_BOOLEAN("TryScroll.SlowScroll", true);
return SCROLL_ON_MAIN_THREAD;
}
if (scrolling_layer_impl) {
active_tree_->SetCurrentlyScrollingLayer(scrolling_layer_impl);
should_bubble_scrolls_ = (type != NON_BUBBLING_GESTURE);
wheel_scrolling_ = (type == WHEEL);
client_->RenewTreePriority();
UMA_HISTOGRAM_BOOLEAN("TryScroll.SlowScroll", false);
return SCROLL_STARTED;
}
return SCROLL_IGNORED;
}
InputHandler::ScrollStatus LayerTreeHostImpl::ScrollAnimated(
const gfx::Point& viewport_point,
const gfx::Vector2dF& scroll_delta) {
if (LayerImpl* layer_impl = CurrentlyScrollingLayer()) {
return ScrollAnimationUpdateTarget(layer_impl, scroll_delta)
? SCROLL_STARTED
: SCROLL_IGNORED;
}
// ScrollAnimated is only used for wheel scrolls. We use the same bubbling
// behavior as ScrollBy to determine which layer to animate, but we do not
// do the Android-specific things in ScrollBy like showing top controls.
InputHandler::ScrollStatus scroll_status = ScrollBegin(viewport_point, WHEEL);
if (scroll_status == SCROLL_STARTED) {
gfx::Vector2dF pending_delta = scroll_delta;
for (LayerImpl* layer_impl = CurrentlyScrollingLayer(); layer_impl;
layer_impl = layer_impl->parent()) {
if (!layer_impl->scrollable())
continue;
gfx::ScrollOffset current_offset = layer_impl->CurrentScrollOffset();
gfx::ScrollOffset target_offset =
ScrollOffsetWithDelta(current_offset, pending_delta);
target_offset.SetToMax(gfx::ScrollOffset());
target_offset.SetToMin(layer_impl->MaxScrollOffset());
gfx::Vector2dF actual_delta = target_offset.DeltaFrom(current_offset);
const float kEpsilon = 0.1f;
bool can_layer_scroll = (std::abs(actual_delta.x()) > kEpsilon ||
std::abs(actual_delta.y()) > kEpsilon);
if (!can_layer_scroll) {
layer_impl->ScrollBy(actual_delta);
pending_delta -= actual_delta;
continue;
}
active_tree_->SetCurrentlyScrollingLayer(layer_impl);
ScrollAnimationCreate(layer_impl, target_offset, current_offset);
SetNeedsAnimate();
return SCROLL_STARTED;
}
}
ScrollEnd();
return scroll_status;
}
gfx::Vector2dF LayerTreeHostImpl::ScrollLayerWithViewportSpaceDelta(
LayerImpl* layer_impl,
float scale_from_viewport_to_screen_space,
const gfx::PointF& viewport_point,
const gfx::Vector2dF& viewport_delta) {
// Layers with non-invertible screen space transforms should not have passed
// the scroll hit test in the first place.
DCHECK(layer_impl->screen_space_transform().IsInvertible());
gfx::Transform inverse_screen_space_transform(
gfx::Transform::kSkipInitialization);
bool did_invert = layer_impl->screen_space_transform().GetInverse(
&inverse_screen_space_transform);
// TODO(shawnsingh): With the advent of impl-side crolling for non-root
// layers, we may need to explicitly handle uninvertible transforms here.
DCHECK(did_invert);
gfx::PointF screen_space_point =
gfx::ScalePoint(viewport_point, scale_from_viewport_to_screen_space);
gfx::Vector2dF screen_space_delta = viewport_delta;
screen_space_delta.Scale(scale_from_viewport_to_screen_space);
// First project the scroll start and end points to local layer space to find
// the scroll delta in layer coordinates.
bool start_clipped, end_clipped;
gfx::PointF screen_space_end_point = screen_space_point + screen_space_delta;
gfx::PointF local_start_point =
MathUtil::ProjectPoint(inverse_screen_space_transform,
screen_space_point,
&start_clipped);
gfx::PointF local_end_point =
MathUtil::ProjectPoint(inverse_screen_space_transform,
screen_space_end_point,
&end_clipped);
// In general scroll point coordinates should not get clipped.
DCHECK(!start_clipped);
DCHECK(!end_clipped);
if (start_clipped || end_clipped)
return gfx::Vector2dF();
// local_start_point and local_end_point are in content space but we want to
// move them to layer space for scrolling.
float width_scale = 1.f / layer_impl->contents_scale_x();
float height_scale = 1.f / layer_impl->contents_scale_y();
local_start_point.Scale(width_scale, height_scale);
local_end_point.Scale(width_scale, height_scale);
// Apply the scroll delta.
gfx::ScrollOffset previous_offset = layer_impl->CurrentScrollOffset();
layer_impl->ScrollBy(local_end_point - local_start_point);
gfx::ScrollOffset scrolled =
layer_impl->CurrentScrollOffset() - previous_offset;
// Get the end point in the layer's content space so we can apply its
// ScreenSpaceTransform.
gfx::PointF actual_local_end_point =
local_start_point + gfx::Vector2dF(scrolled.x(), scrolled.y());
gfx::PointF actual_local_content_end_point =
gfx::ScalePoint(actual_local_end_point,
1.f / width_scale,
1.f / height_scale);
// Calculate the applied scroll delta in viewport space coordinates.
gfx::PointF actual_screen_space_end_point =
MathUtil::MapPoint(layer_impl->screen_space_transform(),
actual_local_content_end_point,
&end_clipped);
DCHECK(!end_clipped);
if (end_clipped)
return gfx::Vector2dF();
gfx::PointF actual_viewport_end_point =
gfx::ScalePoint(actual_screen_space_end_point,
1.f / scale_from_viewport_to_screen_space);
return actual_viewport_end_point - viewport_point;
}
static gfx::Vector2dF ScrollLayerWithLocalDelta(
LayerImpl* layer_impl,
const gfx::Vector2dF& local_delta,
float page_scale_factor) {
gfx::ScrollOffset previous_offset = layer_impl->CurrentScrollOffset();
gfx::Vector2dF delta = local_delta;
delta.Scale(1.f / page_scale_factor);
layer_impl->ScrollBy(delta);
gfx::ScrollOffset scrolled =
layer_impl->CurrentScrollOffset() - previous_offset;
return gfx::Vector2dF(scrolled.x(), scrolled.y());
}
bool LayerTreeHostImpl::ShouldTopControlsConsumeScroll(
const gfx::Vector2dF& scroll_delta) const {
DCHECK(CurrentlyScrollingLayer());
// Always consume if it's in the direction to show the top controls.
if (scroll_delta.y() < 0)
return true;
if (active_tree()->TotalScrollOffset().y() <
active_tree()->TotalMaxScrollOffset().y())
return true;
return false;
}
InputHandlerScrollResult LayerTreeHostImpl::ScrollBy(
const gfx::Point& viewport_point,
const gfx::Vector2dF& scroll_delta) {
TRACE_EVENT0("cc", "LayerTreeHostImpl::ScrollBy");
if (!CurrentlyScrollingLayer())
return InputHandlerScrollResult();
gfx::Vector2dF pending_delta = scroll_delta;
gfx::Vector2dF unused_root_delta;
bool did_scroll_x = false;
bool did_scroll_y = false;
bool did_scroll_top_controls = false;
bool consume_by_top_controls = ShouldTopControlsConsumeScroll(scroll_delta);
// There's an edge case where the outer viewport isn't scrollable when the
// scroll starts, however, as the top controls show the outer viewport becomes
// scrollable. Therefore, always try scrolling the outer viewport before the
// inner.
// TODO(bokan): Move the top controls logic out of the loop since the scroll
// that causes the outer viewport to become scrollable will still be applied
// to the inner viewport.
LayerImpl* start_layer = CurrentlyScrollingLayer();
if (start_layer == InnerViewportScrollLayer() && OuterViewportScrollLayer())
start_layer = OuterViewportScrollLayer();
for (LayerImpl* layer_impl = start_layer;
layer_impl;
layer_impl = layer_impl->parent()) {
if (!layer_impl->scrollable())
continue;
if (layer_impl == InnerViewportScrollLayer() ||
layer_impl == OuterViewportScrollLayer()) {
if (consume_by_top_controls) {
gfx::Vector2dF excess_delta =
top_controls_manager_->ScrollBy(pending_delta);
gfx::Vector2dF applied_delta = pending_delta - excess_delta;
pending_delta = excess_delta;
// Force updating of vertical adjust values if needed.
if (applied_delta.y() != 0)
did_scroll_top_controls = true;
}
// Track root layer deltas for reporting overscroll.
if (layer_impl == InnerViewportScrollLayer())
unused_root_delta = pending_delta;
}
gfx::Vector2dF applied_delta;
// Gesture events need to be transformed from viewport coordinates to local
// layer coordinates so that the scrolling contents exactly follow the
// user's finger. In contrast, wheel events represent a fixed amount of
// scrolling so we can just apply them directly, but the page scale factor
// is applied to the scroll delta.
if (!wheel_scrolling_) {
float scale_from_viewport_to_screen_space = device_scale_factor_;
applied_delta =
ScrollLayerWithViewportSpaceDelta(layer_impl,
scale_from_viewport_to_screen_space,
viewport_point, pending_delta);
} else {
applied_delta = ScrollLayerWithLocalDelta(
layer_impl, pending_delta, active_tree_->current_page_scale_factor());
}
const float kEpsilon = 0.1f;
if (layer_impl == InnerViewportScrollLayer()) {
unused_root_delta.Subtract(applied_delta);
if (std::abs(unused_root_delta.x()) < kEpsilon)
unused_root_delta.set_x(0.0f);
if (std::abs(unused_root_delta.y()) < kEpsilon)
unused_root_delta.set_y(0.0f);
// Disable overscroll on axes which is impossible to scroll.
if (settings_.report_overscroll_only_for_scrollable_axes) {
if (std::abs(active_tree_->TotalMaxScrollOffset().x()) <= kEpsilon ||
!layer_impl->user_scrollable_horizontal())
unused_root_delta.set_x(0.0f);
if (std::abs(active_tree_->TotalMaxScrollOffset().y()) <= kEpsilon ||
!layer_impl->user_scrollable_vertical())
unused_root_delta.set_y(0.0f);
}
}
// Scrolls should bubble perfectly between the outer and inner viewports.
bool allow_unrestricted_bubbling_for_current_layer =
layer_impl == OuterViewportScrollLayer();
bool allow_bubbling_for_current_layer =
allow_unrestricted_bubbling_for_current_layer || should_bubble_scrolls_;
// If the layer wasn't able to move, try the next one in the hierarchy.
bool did_move_layer_x = std::abs(applied_delta.x()) > kEpsilon;
bool did_move_layer_y = std::abs(applied_delta.y()) > kEpsilon;
did_scroll_x |= did_move_layer_x;
did_scroll_y |= did_move_layer_y;
if (!did_move_layer_x && !did_move_layer_y) {
if (allow_bubbling_for_current_layer || !did_lock_scrolling_layer_)
continue;
else
break;
}
did_lock_scrolling_layer_ = true;
// When scrolls are allowed to bubble, it's important that the original
// scrolling layer be preserved. This ensures that, after a scroll bubbles,
// the user can reverse scroll directions and immediately resume scrolling
// the original layer that scrolled.
if (!should_bubble_scrolls_)
active_tree_->SetCurrentlyScrollingLayer(layer_impl);
if (!allow_bubbling_for_current_layer)
break;
if (allow_unrestricted_bubbling_for_current_layer) {
pending_delta -= applied_delta;
} else {
// If the applied delta is within 45 degrees of the input delta, bail out
// to make it easier to scroll just one layer in one direction without
// affecting any of its parents.
float angle_threshold = 45;
if (MathUtil::SmallestAngleBetweenVectors(applied_delta, pending_delta) <
angle_threshold) {
pending_delta = gfx::Vector2dF();
break;
}
// Allow further movement only on an axis perpendicular to the direction
// in which the layer moved.
gfx::Vector2dF perpendicular_axis(-applied_delta.y(), applied_delta.x());
pending_delta =
MathUtil::ProjectVector(pending_delta, perpendicular_axis);
}
if (gfx::ToRoundedVector2d(pending_delta).IsZero())
break;
}
bool did_scroll_content = did_scroll_x || did_scroll_y;
if (did_scroll_content) {
// If we are scrolling with an active scroll handler, forward latency
// tracking information to the main thread so the delay introduced by the
// handler is accounted for.
if (scroll_affects_scroll_handler())
NotifySwapPromiseMonitorsOfForwardingToMainThread();
client_->SetNeedsCommitOnImplThread();
SetNeedsRedraw();
client_->RenewTreePriority();
}
// Scrolling along an axis resets accumulated root overscroll for that axis.
if (did_scroll_x)
accumulated_root_overscroll_.set_x(0);
if (did_scroll_y)
accumulated_root_overscroll_.set_y(0);
accumulated_root_overscroll_ += unused_root_delta;
InputHandlerScrollResult scroll_result;
scroll_result.did_scroll = did_scroll_content || did_scroll_top_controls;
scroll_result.did_overscroll_root = !unused_root_delta.IsZero();
scroll_result.accumulated_root_overscroll = accumulated_root_overscroll_;
scroll_result.unused_scroll_delta = unused_root_delta;
return scroll_result;
}
// This implements scrolling by page as described here:
// http://msdn.microsoft.com/en-us/library/windows/desktop/ms645601(v=vs.85).aspx#_win32_The_Mouse_Wheel
// for events with WHEEL_PAGESCROLL set.
bool LayerTreeHostImpl::ScrollVerticallyByPage(const gfx::Point& viewport_point,
ScrollDirection direction) {
DCHECK(wheel_scrolling_);
for (LayerImpl* layer_impl = CurrentlyScrollingLayer();
layer_impl;
layer_impl = layer_impl->parent()) {
if (!layer_impl->scrollable())
continue;
if (!layer_impl->HasScrollbar(VERTICAL))
continue;
float height = layer_impl->clip_height();
// These magical values match WebKit and are designed to scroll nearly the
// entire visible content height but leave a bit of overlap.
float page = std::max(height * 0.875f, 1.f);
if (direction == SCROLL_BACKWARD)
page = -page;
gfx::Vector2dF delta = gfx::Vector2dF(0.f, page);
gfx::Vector2dF applied_delta =
ScrollLayerWithLocalDelta(layer_impl, delta, 1.f);
if (!applied_delta.IsZero()) {
client_->SetNeedsCommitOnImplThread();
SetNeedsRedraw();
client_->RenewTreePriority();
return true;
}
active_tree_->SetCurrentlyScrollingLayer(layer_impl);
}
return false;
}
void LayerTreeHostImpl::SetRootLayerScrollOffsetDelegate(
LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) {
root_layer_scroll_offset_delegate_ = root_layer_scroll_offset_delegate;
active_tree_->SetRootLayerScrollOffsetDelegate(
root_layer_scroll_offset_delegate_);
}
void LayerTreeHostImpl::OnRootLayerDelegatedScrollOffsetChanged() {
DCHECK(root_layer_scroll_offset_delegate_);
client_->SetNeedsCommitOnImplThread();
SetNeedsRedraw();
active_tree_->OnRootLayerDelegatedScrollOffsetChanged();
active_tree_->set_needs_update_draw_properties();
}
void LayerTreeHostImpl::ClearCurrentlyScrollingLayer() {
active_tree_->ClearCurrentlyScrollingLayer();
did_lock_scrolling_layer_ = false;
scroll_affects_scroll_handler_ = false;
accumulated_root_overscroll_ = gfx::Vector2dF();
}
void LayerTreeHostImpl::ScrollEnd() {
top_controls_manager_->ScrollEnd();
ClearCurrentlyScrollingLayer();
}
InputHandler::ScrollStatus LayerTreeHostImpl::FlingScrollBegin() {
if (!active_tree_->CurrentlyScrollingLayer())
return SCROLL_IGNORED;
if (settings_.ignore_root_layer_flings &&
(active_tree_->CurrentlyScrollingLayer() == InnerViewportScrollLayer() ||
active_tree_->CurrentlyScrollingLayer() == OuterViewportScrollLayer())) {
ClearCurrentlyScrollingLayer();
return SCROLL_IGNORED;
}
if (!wheel_scrolling_) {
// Allow the fling to lock to the first layer that moves after the initial
// fling |ScrollBy()| event.
did_lock_scrolling_layer_ = false;
should_bubble_scrolls_ = false;
}
return SCROLL_STARTED;
}
float LayerTreeHostImpl::DeviceSpaceDistanceToLayer(
const gfx::PointF& device_viewport_point,
LayerImpl* layer_impl) {
if (!layer_impl)
return std::numeric_limits<float>::max();
gfx::Rect layer_impl_bounds(
layer_impl->content_bounds());
gfx::RectF device_viewport_layer_impl_bounds = MathUtil::MapClippedRect(
layer_impl->screen_space_transform(),
layer_impl_bounds);
return device_viewport_layer_impl_bounds.ManhattanDistanceToPoint(
device_viewport_point);
}
void LayerTreeHostImpl::MouseMoveAt(const gfx::Point& viewport_point) {
gfx::PointF device_viewport_point = gfx::ScalePoint(viewport_point,
device_scale_factor_);
LayerImpl* layer_impl =
active_tree_->FindLayerThatIsHitByPoint(device_viewport_point);
if (HandleMouseOverScrollbar(layer_impl, device_viewport_point))
return;
if (scroll_layer_id_when_mouse_over_scrollbar_) {
LayerImpl* scroll_layer_impl = active_tree_->LayerById(
scroll_layer_id_when_mouse_over_scrollbar_);
// The check for a null scroll_layer_impl below was added to see if it will
// eliminate the crashes described in http://crbug.com/326635.
// TODO(wjmaclean) Add a unit test if this fixes the crashes.
ScrollbarAnimationController* animation_controller =
scroll_layer_impl ? scroll_layer_impl->scrollbar_animation_controller()
: NULL;
if (animation_controller)
animation_controller->DidMouseMoveOffScrollbar();
scroll_layer_id_when_mouse_over_scrollbar_ = 0;
}
bool scroll_on_main_thread = false;
LayerImpl* scroll_layer_impl = FindScrollLayerForDeviceViewportPoint(
device_viewport_point, InputHandler::GESTURE, layer_impl,
&scroll_on_main_thread, NULL);
if (scroll_on_main_thread || !scroll_layer_impl)
return;
ScrollbarAnimationController* animation_controller =
scroll_layer_impl->scrollbar_animation_controller();
if (!animation_controller)
return;
// TODO(wjmaclean) Is it ok to choose distance from more than two scrollbars?
float distance_to_scrollbar = std::numeric_limits<float>::max();
for (LayerImpl::ScrollbarSet::iterator it =
scroll_layer_impl->scrollbars()->begin();
it != scroll_layer_impl->scrollbars()->end();
++it)
distance_to_scrollbar =
std::min(distance_to_scrollbar,
DeviceSpaceDistanceToLayer(device_viewport_point, *it));
animation_controller->DidMouseMoveNear(distance_to_scrollbar /
device_scale_factor_);
}
bool LayerTreeHostImpl::HandleMouseOverScrollbar(LayerImpl* layer_impl,
const gfx::PointF& device_viewport_point) {
if (layer_impl && layer_impl->ToScrollbarLayer()) {
int scroll_layer_id = layer_impl->ToScrollbarLayer()->ScrollLayerId();
layer_impl = active_tree_->LayerById(scroll_layer_id);
if (layer_impl && layer_impl->scrollbar_animation_controller()) {
scroll_layer_id_when_mouse_over_scrollbar_ = scroll_layer_id;
layer_impl->scrollbar_animation_controller()->DidMouseMoveNear(0);
} else {
scroll_layer_id_when_mouse_over_scrollbar_ = 0;
}
return true;
}
return false;
}
void LayerTreeHostImpl::PinchGestureBegin() {
pinch_gesture_active_ = true;
previous_pinch_anchor_ = gfx::Point();
client_->RenewTreePriority();
pinch_gesture_end_should_clear_scrolling_layer_ = !CurrentlyScrollingLayer();
if (active_tree_->OuterViewportScrollLayer()) {
active_tree_->SetCurrentlyScrollingLayer(
active_tree_->OuterViewportScrollLayer());
} else {
active_tree_->SetCurrentlyScrollingLayer(
active_tree_->InnerViewportScrollLayer());
}
top_controls_manager_->PinchBegin();
}
void LayerTreeHostImpl::PinchGestureUpdate(float magnify_delta,
const gfx::Point& anchor) {
if (!InnerViewportScrollLayer())
return;
TRACE_EVENT0("cc", "LayerTreeHostImpl::PinchGestureUpdate");
// For a moment the scroll offset ends up being outside of the max range. This
// confuses the delegate so we switch it off till after we're done processing
// the pinch update.
active_tree_->SetRootLayerScrollOffsetDelegate(NULL);
// Keep the center-of-pinch anchor specified by (x, y) in a stable
// position over the course of the magnify.
float page_scale = active_tree_->current_page_scale_factor();
gfx::PointF previous_scale_anchor = gfx::ScalePoint(anchor, 1.f / page_scale);
active_tree_->SetPageScaleOnActiveTree(page_scale * magnify_delta);
page_scale = active_tree_->current_page_scale_factor();
gfx::PointF new_scale_anchor = gfx::ScalePoint(anchor, 1.f / page_scale);
gfx::Vector2dF move = previous_scale_anchor - new_scale_anchor;
previous_pinch_anchor_ = anchor;
// If clamping the inner viewport scroll offset causes a change, it should
// be accounted for from the intended move.
move -= InnerViewportScrollLayer()->ClampScrollToMaxScrollOffset();
// We manually manage the bubbling behaviour here as it is different to that
// implemented in LayerTreeHostImpl::ScrollBy(). Specifically:
// 1) we want to explicit limit the bubbling to the outer/inner viewports,
// 2) we don't want the directional limitations on the unused parts that
// ScrollBy() implements, and
// 3) pinching should not engage the top controls manager.
gfx::Vector2dF unused = OuterViewportScrollLayer()
? OuterViewportScrollLayer()->ScrollBy(move)
: move;
if (!unused.IsZero()) {
InnerViewportScrollLayer()->ScrollBy(unused);
InnerViewportScrollLayer()->ClampScrollToMaxScrollOffset();
}
active_tree_->SetRootLayerScrollOffsetDelegate(
root_layer_scroll_offset_delegate_);
client_->SetNeedsCommitOnImplThread();
SetNeedsRedraw();
client_->RenewTreePriority();
}
void LayerTreeHostImpl::PinchGestureEnd() {
pinch_gesture_active_ = false;
if (pinch_gesture_end_should_clear_scrolling_layer_) {
pinch_gesture_end_should_clear_scrolling_layer_ = false;
ClearCurrentlyScrollingLayer();
}
top_controls_manager_->PinchEnd();
client_->SetNeedsCommitOnImplThread();
// When a pinch ends, we may be displaying content cached at incorrect scales,
// so updating draw properties and drawing will ensure we are using the right
// scales that we want when we're not inside a pinch.
active_tree_->set_needs_update_draw_properties();
SetNeedsRedraw();
}
static void CollectScrollDeltas(ScrollAndScaleSet* scroll_info,
LayerImpl* layer_impl) {
if (!layer_impl)
return;
gfx::ScrollOffset scroll_delta = layer_impl->PullDeltaForMainThread();
if (!scroll_delta.IsZero()) {
LayerTreeHostCommon::ScrollUpdateInfo scroll;
scroll.layer_id = layer_impl->id();
scroll.scroll_delta = gfx::Vector2d(scroll_delta.x(), scroll_delta.y());
scroll_info->scrolls.push_back(scroll);
}
for (size_t i = 0; i < layer_impl->children().size(); ++i)
CollectScrollDeltas(scroll_info, layer_impl->children()[i]);
}
scoped_ptr<ScrollAndScaleSet> LayerTreeHostImpl::ProcessScrollDeltas() {
scoped_ptr<ScrollAndScaleSet> scroll_info(new ScrollAndScaleSet());
CollectScrollDeltas(scroll_info.get(), active_tree_->root_layer());
scroll_info->page_scale_delta =
active_tree_->page_scale_factor()->PullDeltaForMainThread();
scroll_info->top_controls_delta =
active_tree()->top_controls_shown_ratio()->PullDeltaForMainThread();
scroll_info->elastic_overscroll_delta =
active_tree_->elastic_overscroll()->PullDeltaForMainThread();
scroll_info->swap_promises.swap(swap_promises_for_main_thread_scroll_update_);
return scroll_info.Pass();
}
void LayerTreeHostImpl::SetFullRootLayerDamage() {
SetViewportDamage(gfx::Rect(DrawViewportSize()));
}
void LayerTreeHostImpl::ScrollViewportInnerFirst(gfx::Vector2dF scroll_delta) {
DCHECK(InnerViewportScrollLayer());
LayerImpl* scroll_layer = InnerViewportScrollLayer();
gfx::Vector2dF unused_delta = scroll_layer->ScrollBy(scroll_delta);
if (!unused_delta.IsZero() && OuterViewportScrollLayer())
OuterViewportScrollLayer()->ScrollBy(unused_delta);
}
void LayerTreeHostImpl::ScrollViewportBy(gfx::Vector2dF scroll_delta) {
DCHECK(InnerViewportScrollLayer());
LayerImpl* scroll_layer = OuterViewportScrollLayer()
? OuterViewportScrollLayer()
: InnerViewportScrollLayer();
gfx::Vector2dF unused_delta = scroll_layer->ScrollBy(scroll_delta);
if (!unused_delta.IsZero() && (scroll_layer == OuterViewportScrollLayer()))
InnerViewportScrollLayer()->ScrollBy(unused_delta);
}
void LayerTreeHostImpl::AnimatePageScale(base::TimeTicks monotonic_time) {
if (!page_scale_animation_)
return;
gfx::