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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/widget/compositing/layer_tree_settings.h"
#include <algorithm>
#include <tuple>
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/metrics/field_trial_params.h"
#include "base/strings/string_number_conversions.h"
#include "base/system/sys_info.h"
#include "build/build_config.h"
#include "cc/base/features.h"
#include "cc/base/switches.h"
#include "cc/tiles/image_decode_cache_utils.h"
#include "cc/trees/layer_tree_settings.h"
#include "components/viz/common/features.h"
#include "components/viz/common/switches.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "gpu/config/gpu_finch_features.h"
#include "media/base/media_switches.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/switches.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/web_test_support.h"
#include "ui/base/ui_base_features.h"
#include "ui/base/ui_base_switches.h"
#include "ui/native_theme/features/native_theme_features.h"
#include "ui/native_theme/native_theme_utils.h"
#include "ui/native_theme/overlay_scrollbar_constants_aura.h"
namespace blink {
namespace {
// When enabled, scrollbar fade animations' delay and duration are scaled
// according to `kFadeDelayScalingFactor` and `kFadeDurationScalingFactor`
// below, respectively. For more context, please see https://crbug.com/1245964.
BASE_FEATURE(kScaleScrollbarAnimationTiming,
"ScaleScrollbarAnimationTiming",
base::FEATURE_DISABLED_BY_DEFAULT);
constexpr base::FeatureParam<double> kFadeDelayScalingFactor{
&kScaleScrollbarAnimationTiming, "fade_delay_scaling_factor",
/*default_value=*/1.0};
constexpr base::FeatureParam<double> kFadeDurationScalingFactor{
&kScaleScrollbarAnimationTiming, "fade_duration_scaling_factor",
/*default_value=*/1.0};
void InitializeScrollbarFadeAndDelay(cc::LayerTreeSettings& settings) {
// Default settings that may be overridden below for specific platforms.
settings.scrollbar_fade_delay = base::Milliseconds(300);
settings.scrollbar_fade_duration = base::Milliseconds(300);
#if !BUILDFLAG(IS_ANDROID)
if (ui::IsOverlayScrollbarEnabled()) {
settings.idle_thickness_scale = ui::kOverlayScrollbarIdleThicknessScale;
if (ui::IsFluentOverlayScrollbarEnabled()) {
settings.scrollbar_fade_delay = ui::kFluentOverlayScrollbarFadeDelay;
settings.scrollbar_fade_duration =
ui::kFluentOverlayScrollbarFadeDuration;
} else {
settings.scrollbar_fade_delay = ui::kOverlayScrollbarFadeDelay;
settings.scrollbar_fade_duration = ui::kOverlayScrollbarFadeDuration;
}
}
#endif // !BUILDFLAG(IS_ANDROID)
if (base::FeatureList::IsEnabled(kScaleScrollbarAnimationTiming)) {
settings.scrollbar_fade_delay *= kFadeDelayScalingFactor.Get();
settings.scrollbar_fade_duration *= kFadeDurationScalingFactor.Get();
}
}
#if BUILDFLAG(IS_ANDROID)
// With 32 bit pixels, this would mean less than 400kb per buffer. Much less
// than required for, say, nHD.
static const int kSmallScreenPixelThreshold = 1e5;
bool IsSmallScreen(const gfx::Size& size) {
int area = 0;
if (!size.GetCheckedArea().AssignIfValid(&area))
return false;
return area < kSmallScreenPixelThreshold;
}
#endif
std::pair<int, int> GetTilingInterestAreaSizes() {
int interest_area_size_in_pixels;
if (base::FeatureList::IsEnabled(::features::kSmallerInterestArea) &&
::features::kInterestAreaSizeInPixels.Get() ==
::features::kInterestAreaSizeInPixels.default_value) {
interest_area_size_in_pixels =
::features::kDefaultInterestAreaSizeInPixelsWhenEnabled;
} else {
interest_area_size_in_pixels = ::features::kInterestAreaSizeInPixels.Get();
}
if (interest_area_size_in_pixels ==
::features::kInterestAreaSizeInPixels.default_value) {
return {
::features::kDefaultInterestAreaSizeInPixels,
cc::LayerTreeSettings::kDefaultSkewportExtrapolationLimitInScrenPixels};
}
// Keep the same ratio we have by default.
static_assert(
cc::LayerTreeSettings::kDefaultSkewportExtrapolationLimitInScrenPixels ==
2 * ::features::kDefaultInterestAreaSizeInPixels / 3);
return {interest_area_size_in_pixels, (2 * interest_area_size_in_pixels) / 3};
}
#if !BUILDFLAG(IS_ANDROID)
// Adjusting tile memory size in case a lot more websites need more tile
// memory than the current calculation.
BASE_FEATURE(kAdjustTileGpuMemorySize,
"AdjustTileGpuMemorySize",
base::FEATURE_DISABLED_BY_DEFAULT);
constexpr size_t kLargeResolutionMemoryMB = 1152;
constexpr size_t kDefaultMemoryMB = 512;
constexpr base::FeatureParam<int> kNewLargeResolutionMemoryMB{
&kAdjustTileGpuMemorySize, "new_large_resolution_memory_mb",
/*default_value=*/kLargeResolutionMemoryMB};
constexpr base::FeatureParam<int> kNewDefaultMemoryMB{
&kAdjustTileGpuMemorySize, "new_default_memory_mb",
/*default_value=*/kDefaultMemoryMB};
size_t GetLargeResolutionMemoryMB() {
if (base::FeatureList::IsEnabled(kAdjustTileGpuMemorySize)) {
return kNewLargeResolutionMemoryMB.Get();
} else {
return kLargeResolutionMemoryMB;
}
}
size_t GetDefaultMemoryMB() {
if (base::FeatureList::IsEnabled(kAdjustTileGpuMemorySize)) {
return kNewDefaultMemoryMB.Get();
} else {
return kDefaultMemoryMB;
}
}
#endif
} // namespace
// static
cc::ManagedMemoryPolicy GetGpuMemoryPolicy(
const cc::ManagedMemoryPolicy& default_policy,
const gfx::Size& initial_screen_size,
float initial_device_scale_factor) {
cc::ManagedMemoryPolicy actual = default_policy;
actual.bytes_limit_when_visible = 0;
// If the value was overridden on the command line, use the specified value.
static bool client_hard_limit_bytes_overridden =
base::CommandLine::ForCurrentProcess()->HasSwitch(
::switches::kForceGpuMemAvailableMb);
if (client_hard_limit_bytes_overridden) {
if (base::StringToSizeT(
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
::switches::kForceGpuMemAvailableMb),
&actual.bytes_limit_when_visible))
actual.bytes_limit_when_visible *= 1024 * 1024;
return actual;
}
#if BUILDFLAG(IS_ANDROID)
if (base::SysInfo::IsLowEndDevice() ||
base::SysInfo::AmountOfPhysicalMemoryMB() < 2000) {
actual.bytes_limit_when_visible = 96 * 1024 * 1024;
} else {
actual.bytes_limit_when_visible = 256 * 1024 * 1024;
}
#else
// This calculation will increase the tile memory size. It should apply to
// the other plateforms if no regression on Mac.
//
// For large monitors with high resolution, increase the tile memory to
// avoid frequent out of memory problems. With Mac M1 on
// https://www.334-28th.com/, it seems 512 MB works fine on 1920x1080 * 2
// (scale) and 1152 MB on 2056x1329 * 2 (scale). Use this ratio for the
// formula to increase |bytes_limit_when_visible| proportionally.
// For mobile platforms with small display (roughly less than 3k x 1.6k),
// mb_limit will still be 512 MB.
constexpr size_t kLargeResolution = 2056 * 1329 * 2 * 2;
size_t display_size =
std::round(initial_screen_size.width() * initial_device_scale_factor *
initial_screen_size.height() * initial_device_scale_factor);
size_t large_resolution_memory_mb = GetLargeResolutionMemoryMB();
size_t mb_limit_when_visible =
large_resolution_memory_mb * (display_size * 1.0 / kLargeResolution);
// Cap the memory size to one fourth of the total system memory so it won't
// consume too much of the system memory. Still keep the minimum to the
// default of 512MB.
size_t default_memory_mb = GetDefaultMemoryMB();
size_t memory_cap_mb = base::SysInfo::AmountOfPhysicalMemoryMB() / 4;
if (mb_limit_when_visible > memory_cap_mb) {
mb_limit_when_visible = memory_cap_mb;
} else if (mb_limit_when_visible < default_memory_mb) {
mb_limit_when_visible = default_memory_mb;
}
actual.bytes_limit_when_visible = mb_limit_when_visible * 1024 * 1024;
#endif
actual.priority_cutoff_when_visible =
gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
return actual;
}
// static
cc::LayerTreeSettings GenerateLayerTreeSettings(
bool is_threaded,
bool is_for_embedded_frame,
bool is_for_scalable_page,
const gfx::Size& initial_screen_size,
float initial_device_scale_factor) {
const base::CommandLine& cmd = *base::CommandLine::ForCurrentProcess();
cc::LayerTreeSettings settings;
settings.enable_synchronized_scrolling =
base::FeatureList::IsEnabled(::features::kSynchronizedScrolling);
Platform* platform = Platform::Current();
settings.commit_to_active_tree = !is_threaded;
settings.is_for_embedded_frame = is_for_embedded_frame;
settings.is_for_scalable_page = is_for_scalable_page;
settings.main_frame_before_activation_enabled =
cmd.HasSwitch(::switches::kEnableMainFrameBeforeActivation);
// Checkerimaging is not supported for synchronous single-threaded mode, which
// is what the renderer uses if its not threaded.
settings.enable_checker_imaging =
!cmd.HasSwitch(::switches::kDisableCheckerImaging) && is_threaded;
#if BUILDFLAG(IS_ANDROID)
// WebView should always raster in the default color space.
// Synchronous compositing indicates WebView.
if (!platform->IsSynchronousCompositingEnabledForAndroidWebView())
settings.prefer_raster_in_srgb = ::features::IsDynamicColorGamutEnabled();
// We can use a more aggressive limit on Android since decodes tend to take
// longer on these devices.
settings.min_image_bytes_to_checker = 512 * 1024; // 512kB
// Re-rasterization of checker-imaged content with software raster can be too
// costly on Android.
settings.only_checker_images_with_gpu_raster = true;
#endif
auto switch_value_as_int = [](const base::CommandLine& command_line,
const std::string& switch_string, int min_value,
int max_value, int* result) {
std::string string_value = command_line.GetSwitchValueASCII(switch_string);
int int_value;
if (base::StringToInt(string_value, &int_value) && int_value >= min_value &&
int_value <= max_value) {
*result = int_value;
return true;
} else {
DLOG(WARNING) << "Failed to parse switch " << switch_string << ": "
<< string_value;
return false;
}
};
int default_tile_size = 256;
#if BUILDFLAG(IS_ANDROID)
const gfx::Size screen_size =
gfx::ScaleToFlooredSize(initial_screen_size, initial_device_scale_factor);
int display_width = screen_size.width();
int display_height = screen_size.height();
int numTiles = (display_width * display_height) / (256 * 256);
if (numTiles > 16)
default_tile_size = 384;
if (numTiles >= 40)
default_tile_size = 512;
// Adjust for some resolutions that barely straddle an extra
// tile when in portrait mode. This helps worst case scroll/raster
// by not needing a full extra tile for each row.
constexpr int tolerance = 10; // To avoid rounding errors.
int portrait_width = std::min(display_width, display_height);
if (default_tile_size == 256 && std::abs(portrait_width - 768) < tolerance)
default_tile_size += 32;
if (default_tile_size == 384 && std::abs(portrait_width - 1200) < tolerance)
default_tile_size += 32;
#elif BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
// Use 512 for high DPI (dsf=2.0f) devices.
if (initial_device_scale_factor >= 2.0f)
default_tile_size = 512;
#endif
// TODO(danakj): This should not be a setting O_O; it should change when the
// device scale factor on LayerTreeHost changes.
settings.default_tile_size = gfx::Size(default_tile_size, default_tile_size);
if (cmd.HasSwitch(switches::kDefaultTileWidth)) {
int tile_width = 0;
switch_value_as_int(cmd, switches::kDefaultTileWidth, 1,
std::numeric_limits<int>::max(), &tile_width);
settings.default_tile_size.set_width(tile_width);
}
if (cmd.HasSwitch(switches::kDefaultTileHeight)) {
int tile_height = 0;
switch_value_as_int(cmd, switches::kDefaultTileHeight, 1,
std::numeric_limits<int>::max(), &tile_height);
settings.default_tile_size.set_height(tile_height);
}
if (cmd.HasSwitch(switches::kMinHeightForGpuRasterTile)) {
int min_height_for_gpu_raster_tile = 0;
switch_value_as_int(cmd, switches::kMinHeightForGpuRasterTile, 1,
std::numeric_limits<int>::max(),
&min_height_for_gpu_raster_tile);
settings.min_height_for_gpu_raster_tile = min_height_for_gpu_raster_tile;
}
int max_untiled_layer_width = settings.max_untiled_layer_size.width();
if (cmd.HasSwitch(switches::kMaxUntiledLayerWidth)) {
switch_value_as_int(cmd, switches::kMaxUntiledLayerWidth, 1,
std::numeric_limits<int>::max(),
&max_untiled_layer_width);
}
int max_untiled_layer_height = settings.max_untiled_layer_size.height();
if (cmd.HasSwitch(switches::kMaxUntiledLayerHeight)) {
switch_value_as_int(cmd, switches::kMaxUntiledLayerHeight, 1,
std::numeric_limits<int>::max(),
&max_untiled_layer_height);
}
settings.max_untiled_layer_size =
gfx::Size(max_untiled_layer_width, max_untiled_layer_height);
int gpu_rasterization_msaa_sample_count = -1;
if (cmd.HasSwitch(switches::kGpuRasterizationMSAASampleCount)) {
std::string string_value =
cmd.GetSwitchValueASCII(switches::kGpuRasterizationMSAASampleCount);
bool parsed_msaa_sample_count =
base::StringToInt(string_value, &gpu_rasterization_msaa_sample_count);
DCHECK(parsed_msaa_sample_count) << string_value;
DCHECK_GE(gpu_rasterization_msaa_sample_count, 0);
}
settings.gpu_rasterization_msaa_sample_count =
gpu_rasterization_msaa_sample_count;
settings.can_use_lcd_text = platform->IsLcdTextEnabled();
settings.use_zero_copy = cmd.HasSwitch(switches::kEnableZeroCopy);
settings.use_partial_raster = !cmd.HasSwitch(switches::kDisablePartialRaster);
// Partial raster is not supported with RawDraw
settings.use_partial_raster &= !::features::IsUsingRawDraw();
settings.enable_elastic_overscroll = platform->IsElasticOverscrollEnabled();
settings.use_gpu_memory_buffer_resources =
cmd.HasSwitch(switches::kEnableGpuMemoryBufferCompositorResources);
settings.use_painted_device_scale_factor = true;
// Build LayerTreeSettings from command line args.
if (cmd.HasSwitch(::switches::kBrowserControlsShowThreshold)) {
std::string top_threshold_str =
cmd.GetSwitchValueASCII(::switches::kBrowserControlsShowThreshold);
double show_threshold;
if (base::StringToDouble(top_threshold_str, &show_threshold) &&
show_threshold >= 0.f && show_threshold <= 1.f)
settings.top_controls_show_threshold = show_threshold;
}
if (cmd.HasSwitch(::switches::kBrowserControlsHideThreshold)) {
std::string top_threshold_str =
cmd.GetSwitchValueASCII(::switches::kBrowserControlsHideThreshold);
double hide_threshold;
if (base::StringToDouble(top_threshold_str, &hide_threshold) &&
hide_threshold >= 0.f && hide_threshold <= 1.f)
settings.top_controls_hide_threshold = hide_threshold;
}
// Blink sends cc a layer list and property trees.
settings.use_layer_lists = true;
// Blink currently doesn't support setting fractional scroll offsets so CC
// must send integer values. We plan to eventually make Blink use fractional
// offsets internally: https://crbug.com/414283.
settings.commit_fractional_scroll_deltas =
RuntimeEnabledFeatures::FractionalScrollOffsetsEnabled();
settings.enable_smooth_scroll = platform->IsScrollAnimatorEnabled();
// The means the renderer compositor has 2 possible modes:
// - Threaded compositing with a scheduler.
// - Single threaded compositing without a scheduler (for web tests only).
// Using the scheduler in web tests introduces additional composite steps
// that create flakiness.
settings.single_thread_proxy_scheduler = false;
// These flags should be mirrored by UI versions in ui/compositor/.
if (cmd.HasSwitch(::switches::kShowCompositedLayerBorders)) {
settings.initial_debug_state.show_debug_borders.set();
}
settings.initial_debug_state.show_fps_counter =
cmd.HasSwitch(::switches::kShowFPSCounter);
settings.initial_debug_state.show_layer_animation_bounds_rects =
cmd.HasSwitch(::switches::kShowLayerAnimationBounds);
settings.initial_debug_state.show_paint_rects =
cmd.HasSwitch(switches::kShowPaintRects);
settings.initial_debug_state.show_layout_shift_regions =
cmd.HasSwitch(switches::kShowLayoutShiftRegions);
settings.initial_debug_state.show_property_changed_rects =
cmd.HasSwitch(::switches::kShowPropertyChangedRects);
settings.initial_debug_state.show_surface_damage_rects =
cmd.HasSwitch(::switches::kShowSurfaceDamageRects);
settings.initial_debug_state.show_screen_space_rects =
cmd.HasSwitch(::switches::kShowScreenSpaceRects);
settings.initial_debug_state.highlight_non_lcd_text_layers =
cmd.HasSwitch(::switches::kHighlightNonLCDTextLayers);
settings.initial_debug_state.SetRecordRenderingStats(
cmd.HasSwitch(::switches::kEnableGpuBenchmarking));
if (cmd.HasSwitch(::switches::kSlowDownRasterScaleFactor)) {
const int kMinSlowDownScaleFactor = 0;
const int kMaxSlowDownScaleFactor = INT_MAX;
switch_value_as_int(
cmd, ::switches::kSlowDownRasterScaleFactor, kMinSlowDownScaleFactor,
kMaxSlowDownScaleFactor,
&settings.initial_debug_state.slow_down_raster_scale_factor);
}
settings.scrollbar_animator = cc::LayerTreeSettings::ANDROID_OVERLAY;
InitializeScrollbarFadeAndDelay(settings);
if (cmd.HasSwitch(::switches::kCCScrollAnimationDurationForTesting)) {
const int kMinScrollAnimationDuration = 0;
const int kMaxScrollAnimationDuration = INT_MAX;
int duration;
if (switch_value_as_int(cmd,
::switches::kCCScrollAnimationDurationForTesting,
kMinScrollAnimationDuration,
kMaxScrollAnimationDuration, &duration)) {
settings.scroll_animation_duration_for_testing = base::Seconds(duration);
}
}
#if BUILDFLAG(IS_ANDROID)
// Synchronous compositing is used only for the outermost main frame.
bool use_synchronous_compositor =
platform->IsSynchronousCompositingEnabledForAndroidWebView() &&
!is_for_embedded_frame;
// Do not use low memory policies for Android WebView.
bool using_low_memory_policy =
base::SysInfo::IsLowEndDevice() && !IsSmallScreen(screen_size) &&
!platform->IsSynchronousCompositingEnabledForAndroidWebView();
settings.using_synchronous_renderer_compositor = use_synchronous_compositor;
if (use_synchronous_compositor) {
// Root frame in Android WebView uses system scrollbars, so make ours
// invisible. http://crbug.com/677348: This can't be done using
// hide_scrollbars setting because supporting -webkit custom scrollbars is
// still desired on sublayers.
settings.scrollbar_animator = cc::LayerTreeSettings::NO_ANIMATOR;
// Rendering of scrollbars will be disabled in cc::SolidColorScrollbarLayer.
// Early damage check works in combination with synchronous compositor.
settings.enable_early_damage_check =
cmd.HasSwitch(::switches::kCheckDamageEarly);
}
if (using_low_memory_policy) {
// On low-end we want to be very careful about killing other
// apps. So initially we use 50% more memory to avoid flickering
// or raster-on-demand.
settings.max_memory_for_prepaint_percentage = 67;
} else {
// On other devices we have increased memory excessively to avoid
// raster-on-demand already, so now we reserve 50% _only_ to avoid
// raster-on-demand, and use 50% of the memory otherwise.
settings.max_memory_for_prepaint_percentage = 50;
}
// TODO(danakj): Only do this on low end devices.
settings.create_low_res_tiling = true;
#else // BUILDFLAG(IS_ANDROID)
const bool using_low_memory_policy = base::SysInfo::IsLowEndDevice();
settings.enable_fluent_scrollbar = ui::IsFluentScrollbarEnabled();
settings.enable_fluent_overlay_scrollbar =
ui::IsFluentOverlayScrollbarEnabled();
if (ui::IsOverlayScrollbarEnabled()) {
settings.scrollbar_animator = cc::LayerTreeSettings::AURA_OVERLAY;
settings.scrollbar_thinning_duration =
ui::kOverlayScrollbarThinningDuration;
settings.scrollbar_flash_after_any_scroll_update =
!settings.enable_fluent_overlay_scrollbar;
// Avoid animating in web tests to improve reliability.
if (settings.enable_fluent_overlay_scrollbar) {
settings.scrollbar_thinning_duration =
ui::kFluentOverlayScrollbarThinningDuration;
if (WebTestSupport::IsRunningWebTest()) {
settings.scrollbar_thinning_duration = base::Milliseconds(0);
settings.scrollbar_fade_delay = base::TimeDelta::Max();
settings.scrollbar_fade_duration = base::Milliseconds(0);
}
}
}
#endif // BUILDFLAG(IS_ANDROID)
if (!base::FeatureList::IsEnabled(::features::kScrollbarAnimations)) {
settings.scrollbar_thinning_duration = base::TimeDelta();
settings.scrollbar_fade_delay = base::TimeDelta::Max();
settings.scrollbar_fade_duration = base::TimeDelta();
}
settings.decoded_image_working_set_budget_bytes =
cc::ImageDecodeCacheUtils::GetWorkingSetBytesForImageDecode(
/*for_renderer=*/true);
if (using_low_memory_policy) {
// RGBA_4444 textures are only enabled:
// - If the user hasn't explicitly disabled them
// - If system ram is <= 512MB (1GB devices are sometimes low-end).
// - If we are not running in a WebView, where 4444 isn't supported.
// - If we are not using vulkan, since some GPU drivers don't support
// using RGBA4444 as color buffer.
// - If we are not using Skia's Graphite-Dawn backend, since dawn does not
// support RGBA_4444 formats.
// TODO(crbug.com/398868042): Instead of Graphite/Vulkan feature checks, add
// appropriate shared image capability and check for its support.
if (!cmd.HasSwitch(switches::kDisableRGBA4444Textures) &&
base::SysInfo::AmountOfPhysicalMemoryMB() <= 512 &&
!::features::IsUsingVulkan() &&
!::features::IsSkiaGraphiteEnabled(
base::CommandLine::ForCurrentProcess())) {
settings.use_rgba_4444 = true;
// TODO(crbug.com/40042400): Determine whether this is actually necessary;
// its purpose was to support unpremultiply-and-dither, but it ended up
// being always set for RGBA4444.
settings.max_gpu_raster_tile_size = gfx::Size(512, 256);
}
}
if (cmd.HasSwitch(switches::kEnableLowResTiling))
settings.create_low_res_tiling = true;
if (cmd.HasSwitch(switches::kDisableLowResTiling))
settings.create_low_res_tiling = false;
if (cmd.HasSwitch(switches::kEnableRGBA4444Textures) &&
!cmd.HasSwitch(switches::kDisableRGBA4444Textures)) {
settings.use_rgba_4444 = true;
}
settings.max_staging_buffer_usage_in_bytes = 32 * 1024 * 1024; // 32MB
// Use 1/4th of staging buffers on low-end devices.
if (base::SysInfo::IsLowEndDevice())
settings.max_staging_buffer_usage_in_bytes /= 4;
cc::ManagedMemoryPolicy defaults = settings.memory_policy;
settings.memory_policy = GetGpuMemoryPolicy(defaults, initial_screen_size,
initial_device_scale_factor);
settings.disallow_non_exact_resource_reuse =
cmd.HasSwitch(::switches::kDisallowNonExactResourceReuse);
#if BUILDFLAG(IS_ANDROID)
// TODO(crbug.com/746931): This feature appears to be causing visual
// corruption on certain android devices. Will investigate and re-enable.
settings.disallow_non_exact_resource_reuse = true;
#endif
settings.wait_for_all_pipeline_stages_before_draw =
cmd.HasSwitch(::switches::kRunAllCompositorStagesBeforeDraw);
settings.enable_image_animation_resync =
!cmd.HasSwitch(switches::kDisableImageAnimationResync);
settings.enable_backface_visibility_interop =
RuntimeEnabledFeatures::BackfaceVisibilityInteropEnabled();
settings.disable_frame_rate_limit =
cmd.HasSwitch(::switches::kDisableFrameRateLimit);
settings.enable_hit_test_opaqueness = true;
settings.enable_variable_refresh_rate =
::features::IsVariableRefreshRateAlwaysOn();
std::tie(settings.tiling_interest_area_padding,
settings.skewport_extrapolation_limit_in_screen_pixels) =
GetTilingInterestAreaSizes();
settings.dynamic_safe_area_insets_on_scroll_enabled =
RuntimeEnabledFeatures::DynamicSafeAreaInsetsOnScrollEnabled();
return settings;
}
} // namespace blink
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