blimp: Move compositing, input and render widget feature to client/core.

blimp/client/feature/compositor/blimp_layer_tree_settings.cc

-// 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/client/feature/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 "third_party/skia/include/core/SkColor.h"
-#include "ui/gfx/buffer_types.h"
-#include "ui/gl/gl_switches.h"
-
-namespace blimp {
-namespace client {
-
-// 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) {
-  // 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;
-
-  settings->main_frame_before_activation_enabled = false;
-  settings->default_tile_size = gfx::Size(256, 256);
-  settings->gpu_rasterization_msaa_sample_count = 0;
-  settings->gpu_rasterization_forced = false;
-  settings->gpu_rasterization_enabled = false;
-  settings->can_use_lcd_text = false;
-  settings->use_distance_field_text = false;
-#if defined(OS_MACOSX)
-  settings->use_zero_copy = true;
-#else
-  settings->use_zero_copy = false;
-#endif
-  settings->enable_elastic_overscroll = false;
-  settings->image_decode_tasks_enabled = false;
-  settings->single_thread_proxy_scheduler = false;
-  settings->initial_debug_state.show_debug_borders = false;
-  settings->initial_debug_state.show_fps_counter = false;
-  settings->initial_debug_state.show_layer_animation_bounds_rects = false;
-  settings->initial_debug_state.show_paint_rects = false;
-  settings->initial_debug_state.show_property_changed_rects = false;
-  settings->initial_debug_state.show_surface_damage_rects = false;
-  settings->initial_debug_state.show_screen_space_rects = false;
-  settings->initial_debug_state.show_replica_screen_space_rects = false;
-  settings->initial_debug_state.SetRecordRenderingStats(false);
-
-#if defined(OS_ANDROID)
-  if (base::SysInfo::IsLowEndDevice())
-    settings->gpu_rasterization_enabled = false;
-  settings->using_synchronous_renderer_compositor = 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();
-  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;
-
-    settings->renderer_settings.preferred_tile_format = cc::RGBA_4444;
-  } 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)
-  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.
-  // TODO(dtrainor): Update this since https://crrev.com/1267603004 landed.
-  // settings->scrollbar_show_scale_threshold = 1.05f;
-#endif
-
-  // Set the GpuMemoryPolicy.
-  cc::ManagedMemoryPolicy memory_policy = settings->memory_policy_;
-  memory_policy.bytes_limit_when_visible = 0;
-
-#if defined(OS_ANDROID)
-  // We can't query available GPU memory from the system on Android.
-  // Physical memory is also mis-reported sometimes (eg. Nexus 10 reports
-  // 1262MB when it actually has 2GB, while Razr M has 1GB but only reports
-  // 128MB java heap size). First we estimate physical memory using both.
-  size_t dalvik_mb = base::SysInfo::DalvikHeapSizeMB();
-  size_t physical_mb = base::SysInfo::AmountOfPhysicalMemoryMB();
-  size_t physical_memory_mb = 0;
-  if (dalvik_mb >= 256)
-    physical_memory_mb = dalvik_mb * 4;
-  else
-    physical_memory_mb = std::max(dalvik_mb * 4, (physical_mb * 4) / 3);
-
-  // Now we take a default of 1/8th of memory on high-memory devices,
-  // and gradually scale that back for low-memory devices (to be nicer
-  // to other apps so they don't get killed). Examples:
-  // Nexus 4/10(2GB)    256MB (normally 128MB)
-  // Droid Razr M(1GB)  114MB (normally 57MB)
-  // Galaxy Nexus(1GB)  100MB (normally 50MB)
-  // Xoom(1GB)          100MB (normally 50MB)
-  // Nexus S(low-end)   8MB (normally 8MB)
-  // Note that the compositor now uses only some of this memory for
-  // pre-painting and uses the rest only for 'emergencies'.
-  if (memory_policy.bytes_limit_when_visible == 0) {
-    // NOTE: Non-low-end devices use only 50% of these limits,
-    // except during 'emergencies' where 100% can be used.
-    if (!base::SysInfo::IsLowEndDevice()) {
-      if (physical_memory_mb >= 1536)
-        memory_policy.bytes_limit_when_visible =
-            physical_memory_mb / 8;  // >192MB
-      else if (physical_memory_mb >= 1152)
-        memory_policy.bytes_limit_when_visible =
-            physical_memory_mb / 8;  // >144MB
-      else if (physical_memory_mb >= 768)
-        memory_policy.bytes_limit_when_visible =
-            physical_memory_mb / 10;  // >76MB
-      else
-        memory_policy.bytes_limit_when_visible =
-            physical_memory_mb / 12;  // <64MB
-    } else {
-      // Low-end devices have 512MB or less memory by definition
-      // so we hard code the limit rather than relying on the heuristics
-      // above. Low-end devices use 4444 textures so we can use a lower limit.
-      memory_policy.bytes_limit_when_visible = 8;
-    }
-    memory_policy.bytes_limit_when_visible =
-        memory_policy.bytes_limit_when_visible * 1024 * 1024;
-    // Clamp the observed value to a specific range on Android.
-    memory_policy.bytes_limit_when_visible = std::max(
-        memory_policy.bytes_limit_when_visible,
-        static_cast<size_t>(8 * 1024 * 1024));
-    memory_policy.bytes_limit_when_visible =
-        std::min(memory_policy.bytes_limit_when_visible,
-                 static_cast<size_t>(256 * 1024 * 1024));
-  }
-  memory_policy.priority_cutoff_when_visible =
-      gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING;
-#else
-  // Ignore what the system said and give all clients the same maximum
-  // allocation on desktop platforms.
-  memory_policy.bytes_limit_when_visible = 512 * 1024 * 1024;
-  memory_policy.priority_cutoff_when_visible =
-      gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
-#endif
-}
-
-}  // namespace client
-}  // namespace blimp