components: Add Exosphere component.

components/exo/surface.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 "components/exo/surface.h"
+
+#include "base/callback_helpers.h"
+#include "base/logging.h"
+#include "base/trace_event/trace_event.h"
+#include "base/trace_event/trace_event_argument.h"
+#include "cc/resources/single_release_callback.h"
+#include "components/exo/buffer.h"
+#include "components/exo/surface_delegate.h"
+#include "ui/compositor/layer.h"
+#include "ui/gfx/buffer_format_util.h"
+#include "ui/gfx/gpu_memory_buffer.h"
+
+namespace exo {
+
+////////////////////////////////////////////////////////////////////////////////
+// Surface, public:
+
+Surface::Surface() : compositor_(nullptr), delegate_(nullptr) {
+  SetLayer(new ui::Layer(ui::LAYER_SOLID_COLOR));
+  set_owned_by_client();
+}
+
+Surface::~Surface() {
+  if (delegate_)
+    delegate_->OnSurfaceDestroying();
+
+  layer()->SetShowSolidColorContent();
+
+  if (compositor_)
+    compositor_->RemoveObserver(this);
+
+  // Call pending frame callbacks with a null frame time to indicate that they
+  // have been cancelled.
+  frame_callbacks_.splice(frame_callbacks_.end(), pending_frame_callbacks_);
+  active_frame_callbacks_.splice(active_frame_callbacks_.end(),
+                                 frame_callbacks_);
+  for (const auto& frame_callback : active_frame_callbacks_)
+    frame_callback.Run(base::TimeTicks());
+}
+
+void Surface::Attach(Buffer* buffer) {
+  TRACE_EVENT1("exo", "Surface::Attach", "buffer", buffer->AsTracedValue());
+
+  pending_buffer_ = buffer ? buffer->AsWeakPtr() : base::WeakPtr<Buffer>();
+}
+
+void Surface::Damage(const gfx::Rect& damage) {
+  TRACE_EVENT1("exo", "Surface::Damage", "damage", damage.ToString());
+
+  pending_damage_.Union(damage);
+}
+
+void Surface::RequestFrameCallback(const FrameCallback& callback) {
+  TRACE_EVENT0("exo", "Surface::RequestFrameCallback");
+
+  pending_frame_callbacks_.push_back(callback);
+}
+
+void Surface::SetOpaqueRegion(const cc::Region& region) {
+  TRACE_EVENT1("exo", "Surface::SetOpaqueRegion", "region", region.ToString());
+
+  pending_opaque_region_ = region;
+}
+
+void Surface::Commit() {
+  TRACE_EVENT0("exo", "Surface::Commit");
+
+  if (delegate_)
+    delegate_->OnSurfaceCommit();
+
+  cc::TextureMailbox texture_mailbox;
+  scoped_ptr<cc::SingleReleaseCallback> texture_mailbox_release_callback;
+  if (pending_buffer_) {
+    texture_mailbox_release_callback =
+        pending_buffer_->AcquireTextureMailbox(&texture_mailbox);
+    pending_buffer_.reset();
+  }
+
+  if (texture_mailbox_release_callback) {
+    // Update layer with the new contents.
+    layer()->SetTextureMailbox(texture_mailbox,
+                               texture_mailbox_release_callback.Pass(),
+                               texture_mailbox.size_in_pixels());
+    layer()->SetTextureFlipped(false);
+    layer()->SetBounds(gfx::Rect(layer()->bounds().origin(),
+                                 texture_mailbox.size_in_pixels()));
+    layer()->SetFillsBoundsOpaquely(pending_opaque_region_.Contains(
+        gfx::Rect(texture_mailbox.size_in_pixels())));
+  } else {
+    // Show solid color content if there is no pending buffer.
+    layer()->SetShowSolidColorContent();
+  }
+
+  if (texture_mailbox_release_callback) {
+    // Update layer with the new contents.
+    layer()->SetTextureMailbox(texture_mailbox,
+                               texture_mailbox_release_callback.Pass(),
+                               texture_mailbox.size_in_pixels());
+    layer()->SetTextureFlipped(false);
+    layer()->SetBounds(gfx::Rect(layer()->bounds().origin(),
+                                 texture_mailbox.size_in_pixels()));
+    layer()->SetFillsBoundsOpaquely(pending_opaque_region_.Contains(
+        gfx::Rect(texture_mailbox.size_in_pixels())));
+  }
+
+  // Schedule redraw of the damage region.
+  layer()->SchedulePaint(pending_damage_);
+  pending_damage_ = gfx::Rect();
+
+  ui::Compositor* compositor = layer()->GetCompositor();
+  if (compositor && !pending_frame_callbacks_.empty()) {
+    // Start observing the compositor for frame callbacks.
+    if (!compositor_) {
+      compositor->AddObserver(this);
+      compositor_ = compositor;
+    }
+
+    // Move pending frame callbacks to the end of |frame_callbacks_|.
+    frame_callbacks_.splice(frame_callbacks_.end(), pending_frame_callbacks_);
+  }
+}
+
+void Surface::SetSurfaceDelegate(SurfaceDelegate* delegate) {
+  DCHECK(!delegate_ || !delegate);
+  delegate_ = delegate;
+}
+
+scoped_refptr<base::trace_event::TracedValue> Surface::AsTracedValue() const {
+  scoped_refptr<base::trace_event::TracedValue> value =
+      new base::trace_event::TracedValue;
+  value->SetString("name", layer()->name());
+  return value;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// views::Views overrides:
+
+gfx::Size Surface::GetPreferredSize() const {
+  return pending_buffer_ ? pending_buffer_->GetSize() : layer()->size();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ui::CompositorObserver overrides:
+
+void Surface::OnCompositingDidCommit(ui::Compositor* compositor) {
+  // Move frame callbacks to the end of |active_frame_callbacks_|.
+  active_frame_callbacks_.splice(active_frame_callbacks_.end(),
+                                 frame_callbacks_);
+}
+
+void Surface::OnCompositingStarted(ui::Compositor* compositor,
+                                   base::TimeTicks start_time) {
+  // Run all frame callbacks associated with the compositor's active tree.
+  while (!active_frame_callbacks_.empty()) {
+    active_frame_callbacks_.front().Run(start_time);
+    active_frame_callbacks_.pop_front();
+  }
+}
+
+void Surface::OnCompositingShuttingDown(ui::Compositor* compositor) {
+  compositor->RemoveObserver(this);
+  compositor_ = nullptr;
+}
+
+}  // namespace exo