Initial commit of the blimp/ folder and target

blimp/common/compositor/blimp_layer_tree_settings.cc

Index: blimp/common/compositor/blimp_layer_tree_settings.cc
diff --git a/blimp/common/compositor/blimp_layer_tree_settings.cc b/blimp/common/compositor/blimp_layer_tree_settings.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f31793d4ad2ab9b5246115aba05387ba4ea054a7
--- /dev/null
+++ b/blimp/common/compositor/blimp_layer_tree_settings.cc
@@ -0,0 +1,267 @@
+// Copyright 2015 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 "blimp/common/compositor/blimp_layer_tree_settings.h"
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/sys_info.h"
+#include "cc/base/switches.h"
+#include "cc/trees/layer_tree_settings.h"
+#include "content/public/common/content_switches.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/buffer_types.h"
+#include "ui/gl/gl_switches.h"
+
+namespace {
+
+bool GetSwitchValueAsInt(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 {
+    return false;
+  }
+}
+
+void StringToUintVector(const std::string& str, std::vector<unsigned>* vector) {
+  DCHECK(vector->empty());
+  std::vector<std::string> pieces =
+      base::SplitString(str, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+  DCHECK_EQ(pieces.size(), static_cast<size_t>(gfx::BufferFormat::LAST) + 1);
+  for (size_t i = 0; i < pieces.size(); ++i) {
+    unsigned number = 0;
+    bool succeed = base::StringToUint(pieces[i], &number);
+    DCHECK(succeed);
+    vector->push_back(number);
+  }
+}
+
+}  // namespace
+
+namespace blimp {
+
+// TODO(dtrainor): This is temporary to get the compositor up and running.
+// Much of this will either have to be pulled from the server or refactored to
+// share the settings from render_widget_compositor.cc.
+void PopulateCommonLayerTreeSettings(cc::LayerTreeSettings* settings,
+                                     const base::CommandLine& cmd) {
+  // For web contents, layer transforms should scale up the contents of layers
+  // to keep content always crisp when possible.
+  settings->layer_transforms_should_scale_layer_contents = true;
+
+  if (cmd.HasSwitch(switches::kDisableGpuVsync)) {
+    std::string display_vsync_string =
+        cmd.GetSwitchValueASCII(switches::kDisableGpuVsync);
+    if (display_vsync_string == "gpu") {
+      settings->renderer_settings.disable_display_vsync = true;
+    } else if (display_vsync_string == "beginframe") {
+      settings->wait_for_beginframe_interval = false;
+    } else {
+      settings->renderer_settings.disable_display_vsync = true;
+      settings->wait_for_beginframe_interval = false;
+    }
+  }
+  settings->main_frame_before_activation_enabled =
+      cmd.HasSwitch(cc::switches::kEnableMainFrameBeforeActivation) &&
+      !cmd.HasSwitch(cc::switches::kDisableMainFrameBeforeActivation);
+  settings->accelerated_animation_enabled =
+      !cmd.HasSwitch(cc::switches::kDisableThreadedAnimation);
+  settings->use_display_lists = cmd.HasSwitch(switches::kEnableSlimmingPaint);
+
+  settings->default_tile_size = gfx::Size(256, 256);
+  if (cmd.HasSwitch(switches::kDefaultTileWidth)) {
+    int tile_width = 0;
+    GetSwitchValueAsInt(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;
+    GetSwitchValueAsInt(cmd, switches::kDefaultTileHeight, 1,
+                        std::numeric_limits<int>::max(), &tile_height);
+    settings->default_tile_size.set_height(tile_height);
+  }
+
+  int max_untiled_layer_width = settings->max_untiled_layer_size.width();
+  if (cmd.HasSwitch(switches::kMaxUntiledLayerWidth)) {
+    GetSwitchValueAsInt(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)) {
+    GetSwitchValueAsInt(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);
+
+  settings->gpu_rasterization_msaa_sample_count = 0;
+  if (cmd.HasSwitch(switches::kGpuRasterizationMSAASampleCount)) {
+    GetSwitchValueAsInt(cmd, switches::kGpuRasterizationMSAASampleCount, 0,
+                        std::numeric_limits<int>::max(),
+                        &settings->gpu_rasterization_msaa_sample_count);
+  }
+
+  settings->gpu_rasterization_forced =
+      cmd.HasSwitch(switches::kForceGpuRasterization);
+  settings->gpu_rasterization_enabled =
+      cmd.HasSwitch(switches::kEnableGpuRasterization);
+
+  settings->can_use_lcd_text = false;
+  settings->use_distance_field_text =
+      cmd.HasSwitch(switches::kEnableDistanceFieldText);
+
+  settings->use_zero_copy = cmd.HasSwitch(switches::kEnableZeroCopy);
+  settings->enable_elastic_overscroll = false;
+
+  if (cmd.HasSwitch(switches::kContentImageTextureTarget)) {
+    settings->use_image_texture_targets.clear();
+    StringToUintVector(
+        cmd.GetSwitchValueASCII(switches::kContentImageTextureTarget),
+        &settings->use_image_texture_targets);
+  }
+
+  settings->gather_pixel_refs = false;
+  if (cmd.HasSwitch(switches::kNumRasterThreads)) {
+    int num_raster_threads = 0;
+    GetSwitchValueAsInt(cmd, switches::kNumRasterThreads, 0,
+                        std::numeric_limits<int>::max(), &num_raster_threads);
+    settings->gather_pixel_refs = num_raster_threads > 1;
+  }
+
+  if (cmd.HasSwitch(cc::switches::kTopControlsShowThreshold)) {
+    std::string top_threshold_str =
+        cmd.GetSwitchValueASCII(cc::switches::kTopControlsShowThreshold);
+    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(cc::switches::kTopControlsHideThreshold)) {
+    std::string top_threshold_str =
+        cmd.GetSwitchValueASCII(cc::switches::kTopControlsHideThreshold);
+    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;
+  }
+
+  settings->verify_property_trees =
+      cmd.HasSwitch(cc::switches::kEnablePropertyTreeVerification);
+  settings->renderer_settings.allow_antialiasing &=
+      !cmd.HasSwitch(cc::switches::kDisableCompositedAntialiasing);
+  settings->single_thread_proxy_scheduler = false;
+
+  // These flags should be mirrored by UI versions in ui/compositor/.
+  settings->initial_debug_state.show_debug_borders =
+      cmd.HasSwitch(cc::switches::kShowCompositedLayerBorders);
+  settings->initial_debug_state.show_fps_counter =
+      cmd.HasSwitch(cc::switches::kShowFPSCounter);
+  settings->initial_debug_state.show_layer_animation_bounds_rects =
+      cmd.HasSwitch(cc::switches::kShowLayerAnimationBounds);
+  settings->initial_debug_state.show_paint_rects =
+      cmd.HasSwitch(switches::kShowPaintRects);
+  settings->initial_debug_state.show_property_changed_rects =
+      cmd.HasSwitch(cc::switches::kShowPropertyChangedRects);
+  settings->initial_debug_state.show_surface_damage_rects =
+      cmd.HasSwitch(cc::switches::kShowSurfaceDamageRects);
+  settings->initial_debug_state.show_screen_space_rects =
+      cmd.HasSwitch(cc::switches::kShowScreenSpaceRects);
+  settings->initial_debug_state.show_replica_screen_space_rects =
+      cmd.HasSwitch(cc::switches::kShowReplicaScreenSpaceRects);
+
+  settings->initial_debug_state.SetRecordRenderingStats(
+      cmd.HasSwitch(cc::switches::kEnableGpuBenchmarking));
+
+  if (cmd.HasSwitch(cc::switches::kSlowDownRasterScaleFactor)) {
+    const int kMinSlowDownScaleFactor = 0;
+    const int kMaxSlowDownScaleFactor = INT_MAX;
+    GetSwitchValueAsInt(
+        cmd, cc::switches::kSlowDownRasterScaleFactor, kMinSlowDownScaleFactor,
+        kMaxSlowDownScaleFactor,
+        &settings->initial_debug_state.slow_down_raster_scale_factor);
+  }
+
+  settings->invert_viewport_scroll_order =
+      cmd.HasSwitch(switches::kInvertViewportScrollOrder);
+
+  settings->strict_layer_property_change_checking =
+      cmd.HasSwitch(cc::switches::kStrictLayerPropertyChangeChecking);
+
+#if defined(OS_ANDROID)
+  if (base::SysInfo::IsLowEndDevice())
+    settings->gpu_rasterization_enabled = false;
+  settings->using_synchronous_renderer_compositor = false;
+  settings->record_full_layer = false;
+  settings->scrollbar_animator = cc::LayerTreeSettings::LINEAR_FADE;
+  settings->scrollbar_fade_delay_ms = 300;
+  settings->scrollbar_fade_resize_delay_ms = 2000;
+  settings->scrollbar_fade_duration_ms = 300;
+  settings->solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
+  settings->renderer_settings.highp_threshold_min = 2048;
+  settings->ignore_root_layer_flings = false;
+  bool use_low_memory_policy = base::SysInfo::IsLowEndDevice();
+  settings->renderer_settings.use_rgba_4444_textures = use_low_memory_policy;
+  if (use_low_memory_policy) {
+    // On low-end we want to be very carefull 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;
+  }
+  settings->renderer_settings.should_clear_root_render_pass = true;
+
+  // TODO(danakj): Only do this on low end devices.
+  settings->create_low_res_tiling = true;
+
+// TODO(dtrainor): Investigate whether or not we want to use an external
+// source here.
+// settings->use_external_begin_frame_source = true;
+
+#elif !defined(OS_MACOSX)
+  if (ui::IsOverlayScrollbarEnabled()) {
+    settings->scrollbar_animator = cc::LayerTreeSettings::THINNING;
+    settings->solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
+  } else {
+    settings->scrollbar_animator = cc::LayerTreeSettings::LINEAR_FADE;
+    settings->solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
+  }
+  settings->scrollbar_fade_delay_ms = 500;
+  settings->scrollbar_fade_resize_delay_ms = 500;
+  settings->scrollbar_fade_duration_ms = 300;
+
+  // When pinching in, only show the pinch-viewport overlay scrollbars if the
+  // page scale is at least some threshold away from the minimum. i.e. don't
+  // show the pinch scrollbars when at minimum scale.
+  settings->scrollbar_show_scale_threshold = 1.05f;
+#endif
+
+  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(cc::switches::kEnableBeginFrameScheduling))
+    settings->use_external_begin_frame_source = true;
+}
+
+}  // namespace blimp