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() : delegate_(nullptr) {
+  SetLayer(new ui::Layer(ui::LAYER_SOLID_COLOR));
+  set_owned_by_client();
+}
+
+Surface::~Surface() {
+  if (delegate_)
+    delegate_->OnSurfaceDestroying();
+
+  if (pending_mailbox_release_callback_)
+    pending_mailbox_release_callback_->Run(gpu::SyncToken(), false);
+
+  layer()->SetShowSolidColorContent();
+
+  // If we are observing the compositor for frame callbacks, stop now.
+  if (!frame_callbacks_.empty() || !active_frame_callbacks_.empty())
+    layer()->GetCompositor()->RemoveObserver(this);
+}
+
+void Surface::Attach(Buffer* buffer, const gfx::Point& point) {
+  TRACE_EVENT2("exo", "Surface::Attach", "buffer", buffer->AsTracedValue(),
+               "point", point.ToString());
+
+  // If Attach() is called twice without calling Commit(), run the release
+  // callback for the previous buffer now.
+  if (pending_mailbox_release_callback_) {
+    pending_mailbox_release_callback_->Run(gpu::SyncToken(), false);
+    pending_mailbox_release_callback_ = nullptr;
+  }
+
+  // If |buffer| is null, the following Commit() call will remove the surface
+  // content.
+  if (buffer) {
+    pending_mailbox_release_callback_ =
+        buffer->GetTextureMailbox(&pending_mailbox_);
+  }
+}
+
+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();
+
+  if (pending_mailbox_release_callback_) {
+    // Update layer with the new contents.
+    layer()->SetTextureMailbox(pending_mailbox_,
+                               pending_mailbox_release_callback_.Pass(),
+                               pending_mailbox_.size_in_pixels());
+    layer()->SetTextureFlipped(false);
+    layer()->SetBounds(gfx::Rect(layer()->bounds().origin(),
+                                 pending_mailbox_.size_in_pixels()));
+    layer()->SetFillsBoundsOpaquely(pending_opaque_region_.Contains(
+        gfx::Rect(pending_mailbox_.size_in_pixels())));
+  } else {
+    // Show solid color content if there is no pending buffer.
+    layer()->SetShowSolidColorContent();
+  }
+
+  // Schedule redraw of the damage region.
+  layer()->SchedulePaint(pending_damage_);
+  pending_damage_ = gfx::Rect();
+
+  ui::Compositor* compositor = layer()->GetCompositor();
+  if (compositor) {
+    // Start observing the compositor for frame callbacks.
+    if (frame_callbacks_.empty() && active_frame_callbacks_.empty())

[lpique, 2015/11/05 21:25:00]

Shouldn't you also check "&& !frame_callbacks_.empty()"?

+      compositor->AddObserver(this);
+
+    // Move pending frame callbacks to the end of |frame_callbacks_|.
+    frame_callbacks_.splice(frame_callbacks_.end(), pending_frame_callbacks_);

[lpique, 2015/11/05 21:25:00]

Under the calling sequence:

  Surface::RequestFrameCallback(cb1);
  Surface::Commit();
  Surface::RequestFrameCallback(cb2);
  Surface::Commit();

If these calls all happen before the first commit causes an
OnCompositingDidCommit() to be received for it, the second callback ends up
being called when the first commit completes.

(I observed this happening with my client, as the initial surfaces are committed
this way with no real delay)

+  }
+}
+
+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_mailbox_release_callback_ ? pending_mailbox_.size_in_pixels()
+                                           : 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();
+  }
+
+  // Stop observing the compositor if we have processed all frame callbacks.
+  if (frame_callbacks_.empty())
+    compositor->RemoveObserver(this);
+}
+
+void Surface::OnCompositingShuttingDown(ui::Compositor* compositor) {
+  compositor->RemoveObserver(this);
+  active_frame_callbacks_.clear();
+  frame_callbacks_.clear();
+}
+
+}  // namespace exo