Revert of ozone: Remove the "drm" software composited platform

ui/ozone/platform/drm/gpu/drm_surface.cc

+// Copyright 2014 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 "ui/ozone/platform/drm/gpu/drm_surface.h"
+
+#include "base/bind_helpers.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkSurface.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/skia_util.h"
+#include "ui/ozone/platform/drm/gpu/drm_buffer.h"
+#include "ui/ozone/platform/drm/gpu/drm_device.h"
+#include "ui/ozone/platform/drm/gpu/drm_vsync_provider.h"
+#include "ui/ozone/platform/drm/gpu/drm_window.h"
+#include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
+
+namespace ui {
+
+namespace {
+
+scoped_refptr<DrmBuffer> AllocateBuffer(const scoped_refptr<DrmDevice>& drm,
+                                        const gfx::Size& size) {
+  scoped_refptr<DrmBuffer> buffer(new DrmBuffer(drm));
+  SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());
+
+  bool initialized =
+      buffer->Initialize(info, true /* should_register_framebuffer */);
+  DCHECK(initialized) << "Failed to create drm buffer.";
+
+  return buffer;
+}
+
+}  // namespace
+
+DrmSurface::DrmSurface(DrmWindow* window)
+    : window_(window), weak_ptr_factory_(this) {
+}
+
+DrmSurface::~DrmSurface() {
+}
+
+skia::RefPtr<SkSurface> DrmSurface::GetSurface() {
+  return surface_;
+}
+
+void DrmSurface::ResizeCanvas(const gfx::Size& viewport_size) {
+  SkImageInfo info = SkImageInfo::MakeN32(
+      viewport_size.width(), viewport_size.height(), kOpaque_SkAlphaType);
+  surface_ = skia::AdoptRef(SkSurface::NewRaster(info));
+
+  HardwareDisplayController* controller = window_->GetController();
+  if (!controller)
+    return;
+
+  // For the display buffers use the mode size since a |viewport_size| smaller
+  // than the display size will not scanout.
+  front_buffer_ = AllocateBuffer(controller->GetAllocationDrmDevice(),
+                                 controller->GetModeSize());
+  back_buffer_ = AllocateBuffer(controller->GetAllocationDrmDevice(),
+                                controller->GetModeSize());
+}
+
+void DrmSurface::PresentCanvas(const gfx::Rect& damage) {
+  DCHECK(base::MessageLoopForUI::IsCurrent());
+
+  // Create a snapshot of the requested drawing. If we get here again before
+  // presenting, just add the additional damage.
+  pending_image_damage_.Union(damage);
+  pending_image_ = skia::AdoptRef(surface_->newImageSnapshot());
+
+  if (!pending_pageflip_)
+    SchedulePageFlip();
+}
+
+scoped_ptr<gfx::VSyncProvider> DrmSurface::CreateVSyncProvider() {
+  return make_scoped_ptr(new DrmVSyncProvider(window_));
+}
+
+void DrmSurface::SchedulePageFlip() {
+  DCHECK(back_buffer_);
+  SkCanvas* canvas = back_buffer_->GetCanvas();
+
+  // The DrmSurface is double buffered, so the current back buffer is
+  // missing the previous update. Expand damage region.
+  SkRect real_damage =
+      RectToSkRect(UnionRects(pending_image_damage_, last_damage_));
+
+  // Copy damage region.
+  canvas->drawImageRect(pending_image_.get(), real_damage, real_damage, NULL);
+  last_damage_ = pending_image_damage_;
+
+  pending_image_ = nullptr;
+  pending_image_damage_ = gfx::Rect();
+
+  window_->QueueOverlayPlane(OverlayPlane(back_buffer_));
+
+  // Update our front buffer pointer.
+  std::swap(front_buffer_, back_buffer_);
+  // First set the pending flag otherwise there could be a re-entrancy issue if
+  // the callback is executed synchronously.
+  pending_pageflip_ = true;
+  if (!window_->SchedulePageFlip(false /* is_sync */,
+                                 base::Bind(&DrmSurface::OnPageFlip,
+                                            weak_ptr_factory_.GetWeakPtr()))) {
+    pending_pageflip_ = false;
+  }
+}
+
+void DrmSurface::OnPageFlip(gfx::SwapResult result) {
+  pending_pageflip_ = false;
+  if (!pending_image_)
+    return;
+
+  SchedulePageFlip();
+}
+
+}  // namespace ui