cc/layer_tree_settings.cc

   1 // Copyright 2011 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/layer_tree_settings.h"
   6
   7 #include <limits>
   8
   9 #include "base/command_line.h"
  10 #include "base/logging.h"
  11 #include "base/string_number_conversions.h"
  12 #include "cc/switches.h"
  13
  14 namespace cc {
  15
  16 LayerTreeSettings::LayerTreeSettings()
  17     : acceleratePainting(false)
  18     , compositorFrameMessage(false)
  19     , implSidePainting(false)
  20     , renderVSyncEnabled(true)
  21     , perTilePaintingEnabled(false)
  22     , partialSwapEnabled(false)
  23     , acceleratedAnimationEnabled(true)
  24     , pageScalePinchZoomEnabled(false)
  25     , backgroundColorInsteadOfCheckerboard(false)
  26     , showOverdrawInTracing(false)
  27     , canUseLCDText(true)
  28     , shouldClearRootRenderPass(true)
  29     , useLinearFadeScrollbarAnimator(false)
  30     , refreshRate(0)
  31     , maxPartialTextureUpdates(std::numeric_limits<size_t>::max())
  32     , numRasterThreads(1)
  33     , defaultTileSize(gfx::Size(256, 256))
  34     , maxUntiledLayerSize(gfx::Size(512, 512))
  35     , minimumOcclusionTrackingSize(gfx::Size(160, 160))
  36 {
  37     // TODO(danakj): Move this to chromium when we don't go through the WebKit API anymore.
  38     compositorFrameMessage = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kEnableCompositorFrameMessage);
  39     implSidePainting = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kEnableImplSidePainting);
  40     partialSwapEnabled = CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnablePartialSwap);
  41     backgroundColorInsteadOfCheckerboard = CommandLine::ForCurrentProcess()->HasSwitch(switches::kBackgroundColorInsteadOfCheckerboard);
  42     showOverdrawInTracing = CommandLine::ForCurrentProcess()->HasSwitch(switches::kTraceOverdraw);
  43
  44 // TODO(alokp): Remove this hard-coded setting.
  45 // Platforms that need to disable LCD text must explicitly set this value.
  46 #if defined(OS_ANDROID)
  47     canUseLCDText = false;
  48 #endif
  49
  50 #if defined(OS_ANDROID)
  51     // TODO(danakj): Move this out to the android code.
  52     maxPartialTextureUpdates = 0;
  53 #endif
  54
  55 #if defined(OS_ANDROID)
  56     // TODO(danakj): Move this out to the android code.
  57     useLinearFadeScrollbarAnimator = true;
  58 #endif
  59
  60     initialDebugState.showPropertyChangedRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowPropertyChangedRects);
  61     initialDebugState.showSurfaceDamageRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowSurfaceDamageRects);
  62     initialDebugState.showScreenSpaceRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowScreenSpaceRects);
  63     initialDebugState.showReplicaScreenSpaceRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowReplicaScreenSpaceRects);
  64     initialDebugState.showOccludingRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowOccludingRects);
  65     initialDebugState.showNonOccludingRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowNonOccludingRects);
  66
  67     if (CommandLine::ForCurrentProcess()->HasSwitch(
  68             switches::kNumRasterThreads)) {
  69         const size_t kMaxRasterThreads = 64;
  70         std::string num_raster_threads =
  71             CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
  72                 switches::kNumRasterThreads);
  73         int num_threads;
  74         if (base::StringToInt(num_raster_threads, &num_threads) &&
  75             num_threads > 0 && num_threads <= kMaxRasterThreads) {
  76             numRasterThreads = num_threads;
  77         } else {
  78             LOG(WARNING) << "Bad number of raster threads: " <<
  79                 num_raster_threads;
  80         }
  81     }
  82 }
  83
  84 LayerTreeSettings::~LayerTreeSettings()
  85 {
  86 }
  87
  88 }  // namespace cc