switches.cc

// Copyright 2020 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 "third_party/blink/public/common/switches.h"

namespace blink {
namespace switches {

// Allows processing of input before a frame has been committed.
// TODO(schenney): crbug.com/987626. Used by headless. Look for a way not
// involving a command line switch.
const char kAllowPreCommitInput[] = "allow-pre-commit-input";

// Sets the tile size used by composited layers.
const char kDefaultTileWidth[] = "default-tile-width";
const char kDefaultTileHeight[] = "default-tile-height";

// Disallow image animations to be reset to the beginning to avoid skipping
// many frames. Only effective if compositor image animations are enabled.
const char kDisableImageAnimationResync[] = "disable-image-animation-resync";

// When using CPU rasterizing disable low resolution tiling. This uses
// less power, particularly during animations, but more white may be seen
// during fast scrolling especially on slower devices.
const char kDisableLowResTiling[] = "disable-low-res-tiling";

// Disable partial raster in the renderer. Disabling this switch also disables
// the use of persistent gpu memory buffers.
const char kDisablePartialRaster[] = "disable-partial-raster";

// Disable the creation of compositing layers when it would prevent LCD text.
const char kDisablePreferCompositingToLCDText[] =
    "disable-prefer-compositing-to-lcd-text";

// Disables RGBA_4444 textures.
const char kDisableRGBA4444Textures[] = "disable-rgba-4444-textures";

// Disable rasterizer that writes directly to GPU memory associated with tiles.
const char kDisableZeroCopy[] = "disable-zero-copy";

// Specify that all compositor resources should be backed by GPU memory buffers.
const char kEnableGpuMemoryBufferCompositorResources[] =
    "enable-gpu-memory-buffer-compositor-resources";

// When using CPU rasterizing generate low resolution tiling. Low res
// tiles may be displayed during fast scrolls especially on slower devices.
const char kEnableLowResTiling[] = "enable-low-res-tiling";

// Enable the creation of compositing layers when it would prevent LCD text.
const char kEnablePreferCompositingToLCDText[] =
    "enable-prefer-compositing-to-lcd-text";

// Enables RGBA_4444 textures.
const char kEnableRGBA4444Textures[] = "enable-rgba-4444-textures";

// Enable rasterizer that writes directly to GPU memory associated with tiles.
const char kEnableZeroCopy[] = "enable-zero-copy";

// Pins the default referrer policy to the pre-M80 value of
// no-referrer-when-downgrade.
// TODO(crbug.com/1016541): After M88, remove when the corresponding
// enterprise policy has been deleted.
const char kForceLegacyDefaultReferrerPolicy[] =
    "force-legacy-default-referrer-policy";

// The number of multisample antialiasing samples for GPU rasterization.
// Requires MSAA support on GPU to have an effect. 0 disables MSAA.
const char kGpuRasterizationMSAASampleCount[] =
    "gpu-rasterization-msaa-sample-count";

// Used to communicate managed policy for the IntensiveWakeUpThrottling feature.
// This feature is typically controlled by base::Feature (see
// renderer/platform/scheduler/common/features.*) but requires an enterprise
// policy override. This is implicitly a tri-state, and can be either unset, or
// set to "1" for force enable, or "0" for force disable.
extern const char kIntensiveWakeUpThrottlingPolicy[] =
    "intensive-wake-up-throttling-policy";
extern const char kIntensiveWakeUpThrottlingPolicy_ForceDisable[] = "0";
extern const char kIntensiveWakeUpThrottlingPolicy_ForceEnable[] = "1";

// Sets the width and height above which a composited layer will get tiled.
const char kMaxUntiledLayerHeight[] = "max-untiled-layer-height";
const char kMaxUntiledLayerWidth[] = "max-untiled-layer-width";

// Sets the min tile height for GPU raster.
const char kMinHeightForGpuRasterTile[] = "min-height-for-gpu-raster-tile";

// Visibly render a border around layout shift rects in the web page to help
// debug and study layout shifts.
const char kShowLayoutShiftRegions[] = "show-layout-shift-regions";

// Visibly render a border around paint rects in the web page to help debug
// and study painting behavior.
const char kShowPaintRects[] = "show-paint-rects";

// Used to communicate managed policy for the UserAgentClientHint feature.
// This feature is typically controlled by base::Feature (see
// renderer/platform/scheduler/common/features.*) but requires an enterprise
// policy override.

extern const char kUserAgentClientHintDisable[] =
    "user-agent-client-hint-disable";

}  // namespace switches
}  // namespace blink