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// 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 <stddef.h>
#include <vector>
#include "base/time/time.h"
#include "cc/cc_export.h"
#include "cc/debug/layer_tree_debug_state.h"
#include "cc/scheduler/scheduler_settings.h"
#include "cc/tiles/tile_manager_settings.h"
#include "cc/trees/managed_memory_policy.h"
#include "components/viz/common/display/renderer_settings.h"
#include "components/viz/common/resources/resource_format.h"
#include "components/viz/common/resources/resource_settings.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/geometry/size.h"
namespace cc {
class CC_EXPORT LayerTreeSettings {
LayerTreeSettings(const LayerTreeSettings& other);
virtual ~LayerTreeSettings();
SchedulerSettings ToSchedulerSettings() const;
TileManagerSettings ToTileManagerSettings() const;
viz::ResourceSettings resource_settings;
bool single_thread_proxy_scheduler = true;
bool main_frame_before_activation_enabled = false;
bool using_synchronous_renderer_compositor = false;
bool enable_early_damage_check = false;
// When |enable_early_damage_check| is true, the early damage check is
// performed if one of the last |damaged_frame_limit| frames had no damage.
int damaged_frame_limit = 3;
bool enable_latency_recovery = true;
bool can_use_lcd_text = true;
bool gpu_rasterization_forced = false;
int gpu_rasterization_msaa_sample_count = 0;
float gpu_rasterization_skewport_target_time_in_seconds = 0.2f;
bool create_low_res_tiling = false;
bool use_stream_video_draw_quad = false;
enum ScrollbarAnimator {
ScrollbarAnimator scrollbar_animator = NO_ANIMATOR;
base::TimeDelta scrollbar_fade_delay;
base::TimeDelta scrollbar_fade_duration;
base::TimeDelta scrollbar_thinning_duration;
bool scrollbar_flash_after_any_scroll_update = false;
bool scrollbar_flash_when_mouse_enter = false;
SkColor solid_color_scrollbar_color = SK_ColorWHITE;
base::TimeDelta scroll_animation_duration_for_testing;
bool timeout_and_draw_when_animation_checkerboards = true;
bool layer_transforms_should_scale_layer_contents = false;
bool layers_always_allowed_lcd_text = false;
float minimum_contents_scale = 0.0625f;
float low_res_contents_scale_factor = 0.25f;
float top_controls_show_threshold = 0.5f;
float top_controls_hide_threshold = 0.5f;
double background_animation_rate = 1.0;
gfx::Size default_tile_size;
gfx::Size max_untiled_layer_size;
// If set, indicates the largest tile size we will use for GPU Raster. If not
// set, no limit is enforced.
gfx::Size max_gpu_raster_tile_size;
gfx::Size minimum_occlusion_tracking_size;
// 3000 pixels should give sufficient area for prepainting.
// Note this value is specified with an ideal contents scale in mind. That
// is, the ideal tiling would use this value as the padding.
// TODO(vmpstr): Figure out a better number that doesn't depend on scale.
int tiling_interest_area_padding = 3000;
float skewport_target_time_in_seconds = 1.0f;
int skewport_extrapolation_limit_in_screen_pixels = 2000;
size_t max_memory_for_prepaint_percentage = 100;
bool use_zero_copy = false;
bool use_partial_raster = false;
bool enable_elastic_overscroll = false;
bool ignore_root_layer_flings = false;
size_t scheduled_raster_task_limit = 32;
bool use_occlusion_for_tile_prioritization = false;
bool use_layer_lists = false;
int max_staging_buffer_usage_in_bytes = 32 * 1024 * 1024;
ManagedMemoryPolicy memory_policy;
size_t decoded_image_working_set_budget_bytes = 128 * 1024 * 1024;
int max_preraster_distance_in_screen_pixels = 1000;
bool use_rgba_4444 = false;
bool unpremultiply_and_dither_low_bit_depth_tiles = false;
bool enable_mask_tiling = true;
// If set to true, the compositor may selectively defer image decodes to the
// Image Decode Service and raster tiles without images until the decode is
// ready.
bool enable_checker_imaging = false;
// The minimum size of an image we should considering decoding using the
// deferred path.
size_t min_image_bytes_to_checker = 1 * 1024 * 1024; // 1MB.
// Disables checkering of images when not using gpu rasterization.
bool only_checker_images_with_gpu_raster = false;
LayerTreeDebugState initial_debug_state;
// Indicates that the LayerTreeHost should defer commits unless it has a valid
// viz::LocalSurfaceId set.
bool enable_surface_synchronization = false;
// Indicates the case when a sub-frame gets its own LayerTree because it's
// rendered in a different process from its ancestor frames.
bool is_layer_tree_for_subframe = false;
// Determines whether we disallow non-exact matches when finding resources
// in ResourcePool. Only used for layout or pixel tests, as non-deterministic
// resource sizes can lead to floating point error and noise in these tests.
bool disallow_non_exact_resource_reuse = false;
// Whether the Scheduler should wait for all pipeline stages before attempting
// to draw. If |true|, they will block indefinitely until all stages have
// completed the current BeginFrame before triggering their own BeginFrame
// deadlines.
bool wait_for_all_pipeline_stages_before_draw = false;
// Determines whether mouse interactions on composited scrollbars are handled
// on the compositor thread.
bool compositor_threaded_scrollbar_scrolling = false;
// Whether layer tree commits should be made directly to the active
// tree on the impl thread. If |false| LayerTreeHostImpl creates a
// pending layer tree and produces that as the 'sync tree' with
// which LayerTreeHost synchronizes. If |true| LayerTreeHostImpl
// produces the active tree as its 'sync tree'.
bool commit_to_active_tree = true;
// Whether image animations can be reset to the beginning to avoid skipping
// many frames.
bool enable_image_animation_resync = true;
// Whether to use edge anti-aliasing for all layer types that supports it.
bool enable_edge_anti_aliasing = true;
// Whether SetViewportSizeAndScale should update the painted scale factor or
// the device scale factor.
bool use_painted_device_scale_factor = false;
// Whether a HitTestRegionList should be built from the active layer tree when
// submitting a CompositorFrame.
bool build_hit_test_data = false;
// When false, sync tokens are expected to be present, and are verified,
// before transfering gpu resources to the display compositor.
bool delegated_sync_points_required = true;
// When true, LayerTreeHostImplClient will be posting a task to call
// DidReceiveCompositorFrameAck, used by the Compositor but not the
// LayerTreeView.
bool send_compositor_frame_ack = true;
// When false, scroll deltas accumulated on the impl thread are rounded to
// integer values when sent to Blink on commit. This flag should eventually
// go away and CC should send Blink fractional values:
bool commit_fractional_scroll_deltas = false;
// If true, LayerTreeHostImpl automatically allocates LocalSurfaceIds as
// necessary. If false, it is clients generate LocalSurfaceIds as necessary.
// TODO(sky): remove this once is fixed.
bool automatically_allocate_surface_ids = true;
} // namespace cc