src/cc/base/switches.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/base/switches.h"
   6
   7 #include "base/command_line.h"
   8
   9 namespace cc {
  10 namespace switches {
  11
  12 // On platforms where checkerboards are used, prefer background colors instead
  13 // of checkerboards.
  14 const char kBackgroundColorInsteadOfCheckerboard[] =
  15     "background-color-instead-of-checkerboard";
  16
  17 // Disables LCD text.
  18 const char kDisableLCDText[] = "disable-lcd-text";
  19
  20 const char kDisableThreadedAnimation[] = "disable-threaded-animation";
  21
  22 // Disables layer-edge anti-aliasing in the compositor.
  23 const char kDisableCompositedAntialiasing[] =
  24     "disable-composited-antialiasing";
  25
  26 // Paint content on the main thread instead of the compositor thread.
  27 // Overrides the kEnableImplSidePainting flag.
  28 const char kDisableImplSidePainting[] = "disable-impl-side-painting";
  29
  30 // Enables LCD text.
  31 const char kEnableLCDText[] = "enable-lcd-text";
  32
  33 // Paint content on the compositor thread instead of the main thread.
  34 const char kEnableImplSidePainting[] = "enable-impl-side-painting";
  35
  36 const char kEnableTopControlsPositionCalculation[] =
  37     "enable-top-controls-position-calculation";
  38
  39 // Allow heuristics to determine when a layer tile should be drawn with
  40 // the Skia GPU backend.  Only valid with GPU accelerated compositing +
  41 // impl-side painting.
  42 const char kEnableGPURasterization[] = "enable-gpu-rasterization";
  43
  44 // Disable GPU rasterization, i.e. rasterize on the CPU only.
  45 // Overrides the kEnableGPURasterization flag.
  46 const char kDisableGPURasterization[] = "disable-gpu-rasterization";
  47
  48 // The height of the movable top controls.
  49 const char kTopControlsHeight[] = "top-controls-height";
  50
  51 // Percentage of the top controls need to be hidden before they will auto hide.
  52 const char kTopControlsHideThreshold[] = "top-controls-hide-threshold";
  53
  54 // Percentage of the top controls need to be shown before they will auto show.
  55 const char kTopControlsShowThreshold[] = "top-controls-show-threshold";
  56
  57 // Show metrics about overdraw in about:tracing recordings, such as the number
  58 // of pixels culled, and the number of pixels drawn, for each frame.
  59 const char kTraceOverdraw[] = "trace-overdraw";
  60
  61 // Re-rasters everything multiple times to simulate a much slower machine.
  62 // Give a scale factor to cause raster to take that many times longer to
  63 // complete, such as --slow-down-raster-scale-factor=25.
  64 const char kSlowDownRasterScaleFactor[] = "slow-down-raster-scale-factor";
  65
  66 // Max tiles allowed for each tilings interest area.
  67 const char kMaxTilesForInterestArea[] = "max-tiles-for-interest-area";
  68
  69 // The amount of unused resource memory compositor is allowed to keep around.
  70 const char kMaxUnusedResourceMemoryUsagePercentage[] =
  71     "max-unused-resource-memory-usage-percentage";
  72
  73 // Causes the compositor to render to textures which are then sent to the parent
  74 // through the texture mailbox mechanism.
  75 // Requires --enable-compositor-frame-message.
  76 const char kCompositeToMailbox[] = "composite-to-mailbox";
  77
  78 // Check that property changes during paint do not occur.
  79 const char kStrictLayerPropertyChangeChecking[] =
  80     "strict-layer-property-change-checking";
  81
  82 // Virtual viewport for fixed-position elements, scrollbars during pinch.
  83 const char kEnablePinchVirtualViewport[] = "enable-pinch-virtual-viewport";
  84
  85 // Disable partial swap which is needed for some OpenGL drivers / emulators.
  86 const char kUIDisablePartialSwap[] = "ui-disable-partial-swap";
  87
  88 const char kEnablePerTilePainting[] = "enable-per-tile-painting";
  89 const char kUIEnablePerTilePainting[] = "ui-enable-per-tile-painting";
  90
  91 // Enables the GPU benchmarking extension
  92 const char kEnableGpuBenchmarking[] = "enable-gpu-benchmarking";
  93
  94 // Renders a border around compositor layers to help debug and study
  95 // layer compositing.
  96 const char kShowCompositedLayerBorders[] = "show-composited-layer-borders";
  97 const char kUIShowCompositedLayerBorders[] = "ui-show-layer-borders";
  98
  99 // Draws a FPS indicator
 100 const char kShowFPSCounter[] = "show-fps-counter";
 101 const char kUIShowFPSCounter[] = "ui-show-fps-counter";
 102
 103 // Renders a border that represents the bounding box for the layer's animation.
 104 const char kShowLayerAnimationBounds[] = "show-layer-animation-bounds";
 105 const char kUIShowLayerAnimationBounds[] = "ui-show-layer-animation-bounds";
 106
 107 // Show rects in the HUD around layers whose properties have changed.
 108 const char kShowPropertyChangedRects[] = "show-property-changed-rects";
 109 const char kUIShowPropertyChangedRects[] = "ui-show-property-changed-rects";
 110
 111 // Show rects in the HUD around damage as it is recorded into each render
 112 // surface.
 113 const char kShowSurfaceDamageRects[] = "show-surface-damage-rects";
 114 const char kUIShowSurfaceDamageRects[] = "ui-show-surface-damage-rects";
 115
 116 // Show rects in the HUD around the screen-space transformed bounds of every
 117 // layer.
 118 const char kShowScreenSpaceRects[] = "show-screenspace-rects";
 119 const char kUIShowScreenSpaceRects[] = "ui-show-screenspace-rects";
 120
 121 // Show rects in the HUD around the screen-space transformed bounds of every
 122 // layer's replica, when they have one.
 123 const char kShowReplicaScreenSpaceRects[] = "show-replica-screenspace-rects";
 124 const char kUIShowReplicaScreenSpaceRects[] =
 125     "ui-show-replica-screenspace-rects";
 126
 127 // Show rects in the HUD wherever something is known to be drawn opaque and is
 128 // considered occluding the pixels behind it.
 129 const char kShowOccludingRects[] = "show-occluding-rects";
 130 const char kUIShowOccludingRects[] = "ui-show-occluding-rects";
 131
 132 // Show rects in the HUD wherever something is not known to be drawn opaque and
 133 // is not considered to be occluding the pixels behind it.
 134 const char kShowNonOccludingRects[] = "show-nonoccluding-rects";
 135 const char kUIShowNonOccludingRects[] = "ui-show-nonoccluding-rects";
 136
 137 // Enable rasterizer that writes directly to GPU memory.
 138 const char kEnableMapImage[] = "enable-map-image";
 139
 140 // Disable rasterizer that writes directly to GPU memory.
 141 // Overrides the kEnableMapImage flag.
 142 const char kDisableMapImage[] = "disable-map-image";
 143
 144 // Prevents the layer tree unit tests from timing out.
 145 const char kCCLayerTreeTestNoTimeout[] = "cc-layer-tree-test-no-timeout";
 146
 147 // Makes pixel tests write their output instead of read it.
 148 const char kCCRebaselinePixeltests[] = "cc-rebaseline-pixeltests";
 149
 150 // Disable textures using RGBA_4444 layout.
 151 const char kDisable4444Textures[] = "disable-4444-textures";
 152
 153 // Disable touch hit testing in the compositor.
 154 const char kDisableCompositorTouchHitTesting[] =
 155     "disable-compositor-touch-hit-testing";
 156
 157 bool IsLCDTextEnabled() {
 158   const CommandLine* command_line = CommandLine::ForCurrentProcess();
 159   if (command_line->HasSwitch(switches::kDisableLCDText))
 160     return false;
 161   else if (command_line->HasSwitch(switches::kEnableLCDText))
 162     return true;
 163
 164 #if defined(OS_ANDROID)
 165   return false;
 166 #else
 167   return true;
 168 #endif
 169 }
 170
 171 bool IsGpuRasterizationEnabled() {
 172   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 173
 174   if (command_line.HasSwitch(switches::kDisableGPURasterization))
 175     return false;
 176   else if (command_line.HasSwitch(switches::kEnableGPURasterization))
 177     return true;
 178
 179   return false;
 180 }
 181
 182 bool IsImplSidePaintingEnabled() {
 183   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 184
 185   if (command_line.HasSwitch(switches::kDisableImplSidePainting))
 186     return false;
 187   else if (command_line.HasSwitch(switches::kEnableImplSidePainting))
 188     return true;
 189
 190 #if defined(OS_ANDROID)
 191   return true;
 192 #else
 193   return false;
 194 #endif
 195 }
 196
 197 bool IsMapImageEnabled() {
 198   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 199
 200   if (command_line.HasSwitch(switches::kDisableMapImage))
 201     return false;
 202   else if (command_line.HasSwitch(switches::kEnableMapImage))
 203     return true;
 204
 205   return false;
 206 }
 207
 208 }  // namespace switches
 209 }  // namespace cc