ozone: gbm: Add overlay support

The surface builds up a list of overlays as they come in and HDC
is modified to do the page flip + present all overlays in one go.

BUG=380861
NOTRY=true

Review URL: https://codereview.chromium.org/371813004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282662 0039d316-1c4b-4281-b951-d872f2087c98

ui/ozone/platform/dri/dri_surface.cc

@@ -54,6 +54,9 @@ uint32_t DriSurface::GetHandle() const {
   return backbuffer()->handle();
 }
 
+void DriSurface::PreSwapBuffers() {
+}
+
 // This call is made after the hardware just started displaying our back buffer.
 // We need to update our pointer reference and synchronize the two buffers.
 void DriSurface::SwapBuffers() {

ui/ozone/platform/dri/dri_surface.h

@@ -32,6 +32,7 @@ class DriSurface : public ScanoutSurface {
   virtual bool Initialize() OVERRIDE;
   virtual uint32_t GetFramebufferId() const OVERRIDE;
   virtual uint32_t GetHandle() const OVERRIDE;
+  virtual void PreSwapBuffers() OVERRIDE;
   virtual void SwapBuffers() OVERRIDE;
   virtual gfx::Size Size() const OVERRIDE;
 

ui/ozone/platform/dri/dri_surface_factory.cc

@@ -87,7 +87,7 @@ void DriSurfaceAdapter::PresentCanvas(const gfx::Rect& damage) {
     return;
 
   UpdateNativeSurface(damage);
-  controller_->SchedulePageFlip();
+  controller_->SchedulePageFlip(std::vector<OzoneOverlayPlane>(), NULL);
   controller_->WaitForPageFlipEvent();
 }
 

ui/ozone/platform/dri/dri_wrapper.cc

@@ -12,6 +12,12 @@
 #include "base/logging.h"
 
 namespace ui {
+namespace {
+uint32_t ToFixedPoint(double v) {
+  // This returns a number in a 16-bit.16-bit fixed point.
+  return v * 65536.0;
+}
+}  // namespace
 
 DriWrapper::DriWrapper(const char* device_path) {
   fd_ = open(device_path, O_RDWR | O_CLOEXEC);
@@ -86,6 +92,27 @@ bool DriWrapper::PageFlip(uint32_t crtc_id,
                           data);
 }
 
+bool DriWrapper::PageFlipOverlay(uint32_t crtc_id,
+                                 uint32_t framebuffer,
+                                 const gfx::Rect& location,
+                                 const gfx::RectF& source,
+                                 int overlay_plane) {
+  CHECK(fd_ >= 0);
+  return !drmModeSetPlane(fd_,
+                          overlay_plane,
+                          crtc_id,
+                          framebuffer,
+                          0,
+                          location.x(),
+                          location.y(),
+                          location.width(),
+                          location.height(),
+                          ToFixedPoint(source.x()),
+                          ToFixedPoint(source.y()),
+                          ToFixedPoint(source.width()),
+                          ToFixedPoint(source.height()));
+}
+
 ScopedDrmFramebufferPtr DriWrapper::GetFramebuffer(uint32_t framebuffer) {
   CHECK(fd_ >= 0);
   return ScopedDrmFramebufferPtr(drmModeGetFB(fd_, framebuffer));

ui/ozone/platform/dri/dri_wrapper.h

@@ -8,6 +8,9 @@
 #include <stdint.h>
 
 #include "base/macros.h"
+#include "ui/gfx/overlay_transform.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/rect_f.h"
 #include "ui/ozone/platform/dri/scoped_drm_types.h"
 
 typedef struct _drmEventContext drmEventContext;
@@ -67,6 +70,15 @@ class DriWrapper {
   // will receive when processing the pageflip event.
   virtual bool PageFlip(uint32_t crtc_id, uint32_t framebuffer, void* data);
 
+  // Schedule an overlay to be show during the page flip for CRTC |crtc_id|.
+  // |source| location from |framebuffer| will be shown on overlay
+  // |overlay_plane|, in the bounds specified by |location| on the screen.
+  virtual bool PageFlipOverlay(uint32_t crtc_id,
+                               uint32_t framebuffer,
+                               const gfx::Rect& location,
+                               const gfx::RectF& source,
+                               int overlay_plane);
+
   // Returns the property with name |name| associated with |connector|. Returns
   // NULL if property not found. If the returned value is valid, it must be
   // released using FreeProperty().

ui/ozone/platform/dri/gbm_buffer.cc

@@ -79,11 +79,40 @@ bool GbmBuffer::InitializeBuffer(SurfaceFactoryOzone::BufferFormat format,
   return true;
 }
 
-void* GbmBuffer::GetEGLClientBuffer() {
-  return bo_;
+bool GbmBuffer::Initialize() {
+  return bo_ != NULL;
 }
 
-int GbmBuffer::GetDmaBufFd() {
+uint32_t GbmBuffer::GetFramebufferId() const {
+  return framebuffer_;
+}
+
+uint32_t GbmBuffer::GetHandle() const {
+  return handle_;
+}
+
+gfx::Size GbmBuffer::Size() const {
+  return size_;
+}
+
+void GbmBuffer::PreSwapBuffers() {
+}
+
+void GbmBuffer::SwapBuffers() {
+}
+
+GbmPixmap::GbmPixmap(gbm_device* device, DriWrapper* dri, const gfx::Size& size)
+    : buffer_(device, dri, size) {
+}
+
+GbmPixmap::~GbmPixmap() {
+}
+
+void* GbmPixmap::GetEGLClientBuffer() {
+  return buffer_.bo();
+}
+
+int GbmPixmap::GetDmaBufFd() {
   return -1;
 }
 

ui/ozone/platform/dri/gbm_buffer.h

@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/geometry/size.h"
+#include "ui/ozone/platform/dri/scanout_surface.h"
 #include "ui/ozone/public/native_pixmap.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
 
@@ -18,18 +19,22 @@ namespace ui {
 
 class DriWrapper;
 
-class GbmBuffer : public NativePixmap {
+class GbmBuffer : public ScanoutSurface {
  public:
   GbmBuffer(gbm_device* device, DriWrapper* dri, const gfx::Size& size);
+  virtual ~GbmBuffer();
 
   bool InitializeBuffer(SurfaceFactoryOzone::BufferFormat format, bool scanout);
 
-  // NativePixmap:
-  virtual void* GetEGLClientBuffer() OVERRIDE;
-  virtual int GetDmaBufFd() OVERRIDE;
+  // ScanoutSurface:
+  virtual bool Initialize() OVERRIDE;
+  virtual uint32_t GetFramebufferId() const OVERRIDE;
+  virtual uint32_t GetHandle() const OVERRIDE;
+  virtual gfx::Size Size() const OVERRIDE;
+  virtual void PreSwapBuffers() OVERRIDE;
+  virtual void SwapBuffers() OVERRIDE;
 
- protected:
-  virtual ~GbmBuffer();
+  gbm_bo* bo() { return bo_; }
 
  private:
   gbm_device* gbm_device_;
@@ -43,6 +48,21 @@ class GbmBuffer : public NativePixmap {
   gfx::Size size_;
 };
 
+class GbmPixmap : public NativePixmap {
+ public:
+  GbmPixmap(gbm_device* device, DriWrapper* dri, const gfx::Size& size);
+  virtual ~GbmPixmap();
+
+  // NativePixmap:
+  virtual void* GetEGLClientBuffer() OVERRIDE;
+  virtual int GetDmaBufFd() OVERRIDE;
+
+  GbmBuffer* buffer() { return &buffer_; }
+
+ private:
+  GbmBuffer buffer_;
+};
+
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_GBM_BUFFER_H_

ui/ozone/platform/dri/gbm_surface.cc

@@ -81,20 +81,13 @@ gfx::Size GbmSurface::Size() const {
   return size_;
 }
 
-void GbmSurface::SwapBuffers() {
-  // If there was a frontbuffer, is no longer active. Release it back to GBM.
-  if (buffers_[front_buffer_])
-    gbm_surface_release_buffer(native_surface_, buffers_[front_buffer_]);
-
-  // Update the index to the frontbuffer.
-  front_buffer_ ^= 1;
-  // We've just released it. Since GBM doesn't guarantee we'll get the same
-  // buffer back, we set it to NULL so we don't keep track of objects that may
-  // have been destroyed.
-  buffers_[front_buffer_ ^ 1] = NULL;
-}
-
-void GbmSurface::LockCurrentDrawable() {
+// Before scheduling the backbuffer to be scanned out we need to "lock" it.
+// When we lock it, GBM will give a pointer to a buffer representing the
+// backbuffer. It will also update its information on which buffers can not be
+// used for drawing. The buffer will be released when the page flip event
+// occurs (see SwapBuffers). This is called from HardwareDisplayController
+// before scheduling a page flip.
+void GbmSurface::PreSwapBuffers() {
   CHECK(native_surface_);
   // Lock the buffer we want to display.
   buffers_[front_buffer_ ^ 1] = gbm_surface_lock_front_buffer(native_surface_);
@@ -109,4 +102,17 @@ void GbmSurface::LockCurrentDrawable() {
   }
 }
 
+void GbmSurface::SwapBuffers() {
+  // If there was a frontbuffer, is no longer active. Release it back to GBM.
+  if (buffers_[front_buffer_])
+    gbm_surface_release_buffer(native_surface_, buffers_[front_buffer_]);
+
+  // Update the index to the frontbuffer.
+  front_buffer_ ^= 1;
+  // We've just released it. Since GBM doesn't guarantee we'll get the same
+  // buffer back, we set it to NULL so we don't keep track of objects that may
+  // have been destroyed.
+  buffers_[front_buffer_ ^ 1] = NULL;
+}
+
 }  // namespace ui

ui/ozone/platform/dri/gbm_surface.h

@@ -32,16 +32,9 @@ class GbmSurface : public ScanoutSurface {
   virtual uint32_t GetFramebufferId() const OVERRIDE;
   virtual uint32_t GetHandle() const OVERRIDE;
   virtual gfx::Size Size() const OVERRIDE;
+  virtual void PreSwapBuffers() OVERRIDE;
   virtual void SwapBuffers() OVERRIDE;
 
-  // Before scheduling the backbuffer to be scanned out we need to "lock" it.
-  // When we lock it, GBM will give a pointer to a buffer representing the
-  // backbuffer. It will also update its information on which buffers can not be
-  // used for drawing. The buffer will be released when the page flip event
-  // occurs (see SwapBuffers). This is called from GbmSurfaceFactory before
-  // scheduling a page flip.
-  void LockCurrentDrawable();
-
   gbm_surface* native_surface() { return native_surface_; };
 
  private:

ui/ozone/platform/dri/gbm_surface_factory.cc

@@ -15,6 +15,7 @@
 #include "ui/ozone/platform/dri/hardware_display_controller.h"
 #include "ui/ozone/platform/dri/scanout_surface.h"
 #include "ui/ozone/platform/dri/screen_manager.h"
+#include "ui/ozone/public/native_pixmap.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
 
 namespace ui {
@@ -39,6 +40,8 @@ class GbmSurfaceAdapter : public ui::SurfaceOzoneEGL {
 
  private:
   base::WeakPtr<HardwareDisplayController> controller_;
+  NativePixmapList overlay_refs_;
+  std::vector<OzoneOverlayPlane> overlays_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmSurfaceAdapter);
 };
@@ -65,24 +68,32 @@ bool GbmSurfaceAdapter::ResizeNativeWindow(const gfx::Size& viewport_size) {
 bool GbmSurfaceAdapter::OnSwapBuffers() {
   if (!controller_)
     return false;
-
-  static_cast<GbmSurface*>(controller_->surface())->LockCurrentDrawable();
-  if (controller_->SchedulePageFlip()) {
+  bool flip_succeeded =
+      controller_->SchedulePageFlip(overlays_, &overlay_refs_);
+  overlays_.clear();
+  if (flip_succeeded)
     controller_->WaitForPageFlipEvent();
-    return true;
-  }
-
-  return false;
+  return flip_succeeded;
 }
 
 bool GbmSurfaceAdapter::ScheduleOverlayPlane(
     int plane_z_order,
     gfx::OverlayTransform plane_transform,
-    scoped_refptr<ui::NativePixmap> buffer,
+    scoped_refptr<NativePixmap> buffer,
     const gfx::Rect& display_bounds,
     const gfx::RectF& crop_rect) {
-  NOTIMPLEMENTED();
+  GbmPixmap* pixmap = static_cast<GbmPixmap*>(buffer.get());
+  if (!pixmap) {
+    LOG(ERROR) << "ScheduleOverlayPlane passed NULL buffer";
     return false;
+  }
+  overlays_.push_back(OzoneOverlayPlane(pixmap->buffer(),
+                                        plane_z_order,
+                                        plane_transform,
+                                        display_bounds,
+                                        crop_rect));
+  overlay_refs_.push_back(buffer);
+  return true;
 }
 
 scoped_ptr<gfx::VSyncProvider> GbmSurfaceAdapter::CreateVSyncProvider() {
@@ -91,9 +102,11 @@ scoped_ptr<gfx::VSyncProvider> GbmSurfaceAdapter::CreateVSyncProvider() {
 
 }  // namespace
 
-GbmSurfaceFactory::GbmSurfaceFactory()
+GbmSurfaceFactory::GbmSurfaceFactory(bool allow_surfaceless)
     : DriSurfaceFactory(NULL, NULL),
-      device_(NULL) {}
+      device_(NULL),
+      allow_surfaceless_(allow_surfaceless) {
+}
 
 GbmSurfaceFactory::~GbmSurfaceFactory() {}
 
@@ -176,11 +189,15 @@ scoped_ptr<ui::SurfaceOzoneEGL> GbmSurfaceFactory::CreateEGLSurfaceForWidget(
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::Size size,
     BufferFormat format) {
-  scoped_refptr<GbmBuffer> buf = new GbmBuffer(device_, drm_, size);
-  if (!buf->InitializeBuffer(format, true)) {
+  scoped_refptr<GbmPixmap> buf = new GbmPixmap(device_, drm_, size);
+  if (!buf->buffer()->InitializeBuffer(format, true)) {
     return NULL;
   }
   return buf;
 }
 
+bool GbmSurfaceFactory::CanShowPrimaryPlaneAsOverlay() {
+  return allow_surfaceless_;
+}
+
 }  // namespace ui

ui/ozone/platform/dri/gbm_surface_factory.h

@@ -13,7 +13,7 @@ namespace ui {
 
 class GbmSurfaceFactory : public DriSurfaceFactory {
  public:
-  GbmSurfaceFactory();
+  GbmSurfaceFactory(bool allow_surfaceless);
   virtual ~GbmSurfaceFactory();
 
   void InitializeGpu(DriWrapper* dri,
@@ -32,9 +32,11 @@ class GbmSurfaceFactory : public DriSurfaceFactory {
   virtual scoped_refptr<ui::NativePixmap> CreateNativePixmap(
       gfx::Size size,
       BufferFormat format) OVERRIDE;
+  virtual bool CanShowPrimaryPlaneAsOverlay() OVERRIDE;
 
  private:
   gbm_device* device_;  // Not owned.
+  bool allow_surfaceless_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmSurfaceFactory);
 };

ui/ozone/platform/dri/hardware_display_controller.cc

@@ -19,6 +19,7 @@
 #include "ui/ozone/platform/dri/dri_buffer.h"
 #include "ui/ozone/platform/dri/dri_wrapper.h"
 #include "ui/ozone/platform/dri/scanout_surface.h"
+#include "ui/ozone/public/native_pixmap.h"
 
 namespace ui {
 
@@ -46,6 +47,19 @@ void HandlePageFlipEvent(int fd,
 
 }  // namespace
 
+OzoneOverlayPlane::OzoneOverlayPlane(ScanoutSurface* scanout,
+                                     int z_order,
+                                     gfx::OverlayTransform plane_transform,
+                                     const gfx::Rect& display_bounds,
+                                     const gfx::RectF& crop_rect)
+    : scanout(scanout),
+      z_order(z_order),
+      plane_transform(plane_transform),
+      display_bounds(display_bounds),
+      crop_rect(crop_rect),
+      overlay_plane(0) {
+}
+
 HardwareDisplayController::HardwareDisplayController(
     DriWrapper* drm,
     uint32_t connector_id,
@@ -112,15 +126,54 @@ void HardwareDisplayController::Disable() {
   is_disabled_ = true;
 }
 
-bool HardwareDisplayController::SchedulePageFlip() {
-  CHECK(surface_);
-  if (!is_disabled_ && !drm_->PageFlip(crtc_id_,
-                                       surface_->GetFramebufferId(),
-                                       this)) {
+ScanoutSurface* HardwareDisplayController::GetPrimaryPlane(
+    const std::vector<OzoneOverlayPlane>& overlays) {
+  ScanoutSurface* primary = surface_.get();
+  for (size_t i = 0; i < overlays.size(); i++) {
+    const OzoneOverlayPlane& plane = overlays[i];
+    if (plane.z_order == 0) {
+      return plane.scanout;
+    }
+  }
+
+  return primary;
+}
+
+bool HardwareDisplayController::SchedulePageFlip(
+    const std::vector<OzoneOverlayPlane>& overlays,
+    NativePixmapList* references) {
+  ScanoutSurface* primary = GetPrimaryPlane(overlays);
+  CHECK(primary);
+
+  primary->PreSwapBuffers();
+
+  if (!is_disabled_ &&
+      !drm_->PageFlip(crtc_id_, primary->GetFramebufferId(), this)) {
     LOG(ERROR) << "Cannot page flip: " << strerror(errno);
     return false;
   }
 
+  current_overlay_references_.clear();
+  if (references)
+    current_overlay_references_.swap(*references);
+
+  for (size_t i = 0; i < overlays.size(); i++) {
+    const OzoneOverlayPlane& plane = overlays[i];
+    if (!plane.overlay_plane)
+      continue;
+    const gfx::Size& size = plane.scanout->Size();
+    gfx::RectF crop_rect = plane.crop_rect;
+    crop_rect.Scale(size.width(), size.height());
+    if (!drm_->PageFlipOverlay(crtc_id_,
+                               plane.scanout->GetFramebufferId(),
+                               plane.display_bounds,
+                               crop_rect,
+                               plane.overlay_plane)) {
+      LOG(ERROR) << "Cannot display on overlay: " << strerror(errno);
+      return false;
+    }
+  }
+
   return true;
 }
 

ui/ozone/platform/dri/hardware_display_controller.h

@@ -21,8 +21,26 @@ class Point;
 
 namespace ui {
 
+class NativePixmap;
 class ScanoutSurface;
 
+typedef std::vector<scoped_refptr<NativePixmap> > NativePixmapList;
+
+struct OzoneOverlayPlane {
+  OzoneOverlayPlane(ScanoutSurface* scanout,
+                    int z_order,
+                    gfx::OverlayTransform plane_transform,
+                    const gfx::Rect& display_bounds,
+                    const gfx::RectF& crop_rect);
+
+  ScanoutSurface* scanout;
+  int z_order;
+  gfx::OverlayTransform plane_transform;
+  gfx::Rect display_bounds;
+  gfx::RectF crop_rect;
+  int overlay_plane;
+};
+
 // The HDCOz will handle modesettings and scannout operations for hardware
 // devices.
 //
@@ -114,7 +132,8 @@ class HardwareDisplayController
   // called again before the page flip occurrs.
   //
   // Returns true if the page flip was successfully registered, false otherwise.
-  bool SchedulePageFlip();
+  bool SchedulePageFlip(const std::vector<OzoneOverlayPlane>& overlays,
+                        NativePixmapList* references);
 
   // TODO(dnicoara) This should be on the MessageLoop when Ozone can have
   // BeginFrame can be triggered explicitly by Ozone.
@@ -150,6 +169,11 @@ class HardwareDisplayController
   };
 
  private:
+  ScanoutSurface* GetPrimaryPlane(
+      const std::vector<OzoneOverlayPlane>& overlays);
+
+  NativePixmapList current_overlay_references_;
+
   // Object containing the connection to the graphics device and wraps the API
   // calls to control it.
   DriWrapper* drm_;

ui/ozone/platform/dri/hardware_display_controller_unittest.cc

@@ -10,6 +10,7 @@
 #include "ui/ozone/platform/dri/hardware_display_controller.h"
 #include "ui/ozone/platform/dri/test/mock_dri_surface.h"
 #include "ui/ozone/platform/dri/test/mock_dri_wrapper.h"
+#include "ui/ozone/public/native_pixmap.h"
 
 namespace {
 
@@ -18,6 +19,7 @@ const drmModeModeInfo kDefaultMode =
     {0, 6, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, {'\0'}};
 
 const gfx::Size kDefaultModeSize(kDefaultMode.hdisplay, kDefaultMode.vdisplay);
+const gfx::SizeF kDefaultModeSizeF(1.0, 1.0);
 
 }  // namespace
 
@@ -63,7 +65,8 @@ TEST_F(HardwareDisplayControllerTest, CheckStateAfterPageFlip) {
   EXPECT_TRUE(surface->Initialize());
   EXPECT_TRUE(controller_->BindSurfaceToController(surface.Pass(),
                                                    kDefaultMode));
-  EXPECT_TRUE(controller_->SchedulePageFlip());
+  EXPECT_TRUE(controller_->SchedulePageFlip(
+      std::vector<ui::OzoneOverlayPlane>(), NULL));
   EXPECT_TRUE(controller_->surface() != NULL);
 }
 
@@ -88,7 +91,8 @@ TEST_F(HardwareDisplayControllerTest, CheckStateIfPageFlipFails) {
   EXPECT_TRUE(surface->Initialize());
   EXPECT_TRUE(controller_->BindSurfaceToController(surface.Pass(),
                                                    kDefaultMode));
-  EXPECT_FALSE(controller_->SchedulePageFlip());
+  EXPECT_FALSE(controller_->SchedulePageFlip(
+      std::vector<ui::OzoneOverlayPlane>(), NULL));
 }
 
 TEST_F(HardwareDisplayControllerTest, VerifyNoDRMCallsWhenDisabled) {
@@ -99,7 +103,8 @@ TEST_F(HardwareDisplayControllerTest, VerifyNoDRMCallsWhenDisabled) {
   EXPECT_TRUE(controller_->BindSurfaceToController(surface.Pass(),
                                                    kDefaultMode));
   controller_->Disable();
-  EXPECT_TRUE(controller_->SchedulePageFlip());
+  EXPECT_TRUE(controller_->SchedulePageFlip(
+      std::vector<ui::OzoneOverlayPlane>(), NULL));
   EXPECT_EQ(0, drm_->get_page_flip_call_count());
 
   surface.reset(new ui::MockDriSurface(drm_.get(), kDefaultModeSize));
@@ -107,6 +112,58 @@ TEST_F(HardwareDisplayControllerTest, VerifyNoDRMCallsWhenDisabled) {
   EXPECT_TRUE(surface->Initialize());
   EXPECT_TRUE(controller_->BindSurfaceToController(surface.Pass(),
                                                    kDefaultMode));
-  EXPECT_TRUE(controller_->SchedulePageFlip());
+  EXPECT_TRUE(controller_->SchedulePageFlip(
+      std::vector<ui::OzoneOverlayPlane>(), NULL));
   EXPECT_EQ(1, drm_->get_page_flip_call_count());
 }
+
+TEST_F(HardwareDisplayControllerTest, CheckOverlayMainSurfaceReplacement) {
+  scoped_ptr<ui::ScanoutSurface> surface(
+      new ui::MockDriSurface(drm_.get(), kDefaultModeSize));
+  scoped_ptr<ui::ScanoutSurface> overlay(
+      new ui::MockDriSurface(drm_.get(), kDefaultModeSize));
+
+  EXPECT_TRUE(surface->Initialize());
+  EXPECT_TRUE(
+      controller_->BindSurfaceToController(surface.Pass(), kDefaultMode));
+  EXPECT_TRUE(overlay->Initialize());
+
+  std::vector<ui::OzoneOverlayPlane> overlays;
+  std::vector<scoped_refptr<ui::NativePixmap> > overlay_refs;
+
+  overlays.push_back(ui::OzoneOverlayPlane(overlay.get(),
+                                           0,
+                                           gfx::OVERLAY_TRANSFORM_NONE,
+                                           gfx::Rect(kDefaultModeSize),
+                                           gfx::RectF(kDefaultModeSizeF)));
+
+  EXPECT_TRUE(controller_->SchedulePageFlip(overlays, &overlay_refs));
+  EXPECT_EQ(1, drm_->get_page_flip_call_count());
+  EXPECT_EQ(0, drm_->get_overlay_flip_call_count());
+}
+
+TEST_F(HardwareDisplayControllerTest, CheckOverlayPresent) {
+  scoped_ptr<ui::ScanoutSurface> surface(
+      new ui::MockDriSurface(drm_.get(), kDefaultModeSize));
+  scoped_ptr<ui::ScanoutSurface> overlay(
+      new ui::MockDriSurface(drm_.get(), kDefaultModeSize));
+
+  EXPECT_TRUE(surface->Initialize());
+  EXPECT_TRUE(
+      controller_->BindSurfaceToController(surface.Pass(), kDefaultMode));
+  EXPECT_TRUE(overlay->Initialize());
+
+  std::vector<ui::OzoneOverlayPlane> overlays;
+  std::vector<scoped_refptr<ui::NativePixmap> > overlay_refs;
+
+  overlays.push_back(ui::OzoneOverlayPlane(overlay.get(),
+                                           1,
+                                           gfx::OVERLAY_TRANSFORM_NONE,
+                                           gfx::Rect(kDefaultModeSize),
+                                           gfx::RectF(kDefaultModeSizeF)));
+  overlays.back().overlay_plane = 1;  // Force association with a plane.
+
+  EXPECT_TRUE(controller_->SchedulePageFlip(overlays, &overlay_refs));
+  EXPECT_EQ(1, drm_->get_page_flip_call_count());
+  EXPECT_EQ(1, drm_->get_overlay_flip_call_count());
+}

ui/ozone/platform/dri/ozone_platform_gbm.cc

@@ -13,6 +13,7 @@
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
 #include "ui/ozone/platform/dri/cursor_factory_evdev_dri.h"
 #include "ui/ozone/platform/dri/dri_wrapper.h"
+#include "ui/ozone/platform/dri/gbm_buffer.h"
 #include "ui/ozone/platform/dri/gbm_surface.h"
 #include "ui/ozone/platform/dri/gbm_surface_factory.h"
 #include "ui/ozone/platform/dri/gpu_platform_support_gbm.h"
@@ -56,7 +57,7 @@ class GbmSurfaceGenerator : public ScanoutSurfaceGenerator {
     return new GbmSurface(device_, dri_, size);
   }
 
- private:
+ protected:
   DriWrapper* dri_;  // Not owned.
 
   // HACK: gbm drivers have broken linkage
@@ -67,9 +68,24 @@ class GbmSurfaceGenerator : public ScanoutSurfaceGenerator {
   DISALLOW_COPY_AND_ASSIGN(GbmSurfaceGenerator);
 };
 
+class GbmEglImageSurfaceGenerator : public GbmSurfaceGenerator {
+ public:
+  GbmEglImageSurfaceGenerator(DriWrapper* dri) : GbmSurfaceGenerator(dri) {}
+  virtual ~GbmEglImageSurfaceGenerator() {}
+
+  virtual ScanoutSurface* Create(const gfx::Size& size) OVERRIDE {
+    scoped_ptr<GbmBuffer> buffer =
+        scoped_ptr<GbmBuffer>(new GbmBuffer(device_, dri_, size));
+    if (!buffer->InitializeBuffer(SurfaceFactoryOzone::RGBA_8888, true)) {
+      return NULL;
+    }
+    return buffer.release();
+  }
+};
+
 class OzonePlatformGbm : public OzonePlatform {
  public:
-  OzonePlatformGbm() {
+  OzonePlatformGbm(bool use_surfaceless) : use_surfaceless_(use_surfaceless) {
      base::AtExitManager::RegisterTask(
         base::Bind(&base::DeletePointer<OzonePlatformGbm>, this));
   }
@@ -107,7 +123,7 @@ class OzonePlatformGbm : public OzonePlatform {
     vt_manager_.reset(new VirtualTerminalManager());
     // Needed since the browser process creates the accelerated widgets and that
     // happens through SFO.
-    surface_factory_ozone_.reset(new GbmSurfaceFactory());
+    surface_factory_ozone_.reset(new GbmSurfaceFactory(use_surfaceless_));
 
     device_manager_ = CreateDeviceManager();
     gpu_platform_support_host_.reset(new GpuPlatformSupportHostGbm());
@@ -119,11 +135,14 @@ class OzonePlatformGbm : public OzonePlatform {
 
   virtual void InitializeGPU() OVERRIDE {
     dri_.reset(new DriWrapper(kDefaultGraphicsCardPath));
+    if (use_surfaceless_)
+      surface_generator_.reset(new GbmEglImageSurfaceGenerator(dri_.get()));
+    else
       surface_generator_.reset(new GbmSurfaceGenerator(dri_.get()));
     screen_manager_.reset(new ScreenManager(dri_.get(),
                                             surface_generator_.get()));
     if (!surface_factory_ozone_)
-      surface_factory_ozone_.reset(new GbmSurfaceFactory());
+      surface_factory_ozone_.reset(new GbmSurfaceFactory(use_surfaceless_));
 
     surface_factory_ozone_->InitializeGpu(dri_.get(),
                                           surface_generator_->device(),
@@ -142,6 +161,7 @@ class OzonePlatformGbm : public OzonePlatform {
   }
 
  private:
+  bool use_surfaceless_;
   scoped_ptr<VirtualTerminalManager> vt_manager_;
   scoped_ptr<DriWrapper> dri_;
   scoped_ptr<GbmSurfaceGenerator> surface_generator_;
@@ -160,6 +180,11 @@ class OzonePlatformGbm : public OzonePlatform {
 
 }  // namespace
 
-OzonePlatform* CreateOzonePlatformGbm() { return new OzonePlatformGbm; }
+OzonePlatform* CreateOzonePlatformGbm() {
+  return new OzonePlatformGbm(false);
+}
+OzonePlatform* CreateOzonePlatformGbmEglImage() {
+  return new OzonePlatformGbm(true);
+}
 
 }  // namespace ui

ui/ozone/platform/dri/scanout_surface.h

@@ -59,6 +59,9 @@ class ScanoutSurface {
   // Returns true if the initialization is successful, false otherwise.
   virtual bool Initialize() = 0;
 
+  // Prepare the surface to be displayed.
+  virtual void PreSwapBuffers() = 0;
+
   // Swaps the back buffer with the front buffer.
   virtual void SwapBuffers() = 0;
 

ui/ozone/platform/dri/test/mock_dri_wrapper.cc

@@ -27,6 +27,7 @@ MockDriWrapper::MockDriWrapper(int fd)
       add_framebuffer_call_count_(0),
       remove_framebuffer_call_count_(0),
       page_flip_call_count_(0),
+      overlay_flip_call_count_(0),
       set_crtc_expectation_(true),
       add_framebuffer_expectation_(true),
       page_flip_expectation_(true) {
@@ -79,6 +80,15 @@ bool MockDriWrapper::PageFlip(uint32_t crtc_id,
   return page_flip_expectation_;
 }
 
+bool MockDriWrapper::PageFlipOverlay(uint32_t crtc_id,
+                                     uint32_t framebuffer,
+                                     const gfx::Rect& location,
+                                     const gfx::RectF& source,
+                                     int overlay_plane) {
+  overlay_flip_call_count_++;
+  return true;
+}
+
 ScopedDrmPropertyPtr MockDriWrapper::GetProperty(drmModeConnector* connector,
                                                  const char* name) {
   return ScopedDrmPropertyPtr(DrmAllocator<drmModePropertyRes>());

ui/ozone/platform/dri/test/mock_dri_wrapper.h

@@ -24,6 +24,7 @@ class MockDriWrapper : public ui::DriWrapper {
     return remove_framebuffer_call_count_;
   }
   int get_page_flip_call_count() const { return page_flip_call_count_; }
+  int get_overlay_flip_call_count() const { return overlay_flip_call_count_; }
   void fail_init() { fd_ = -1; }
   void set_set_crtc_expectation(bool state) { set_crtc_expectation_ = state; }
   void set_page_flip_expectation(bool state) { page_flip_expectation_ = state; }
@@ -49,6 +50,11 @@ class MockDriWrapper : public ui::DriWrapper {
   virtual bool PageFlip(uint32_t crtc_id,
                         uint32_t framebuffer,
                         void* data) OVERRIDE;
+  virtual bool PageFlipOverlay(uint32_t crtc_id,
+                               uint32_t framebuffer,
+                               const gfx::Rect& location,
+                               const gfx::RectF& source,
+                               int overlay_plane) OVERRIDE;
   virtual ScopedDrmPropertyPtr GetProperty(drmModeConnector* connector,
                                            const char* name) OVERRIDE;
   virtual bool SetProperty(uint32_t connector_id,
@@ -69,6 +75,7 @@ class MockDriWrapper : public ui::DriWrapper {
   int add_framebuffer_call_count_;
   int remove_framebuffer_call_count_;
   int page_flip_call_count_;
+  int overlay_flip_call_count_;
 
   bool set_crtc_expectation_;
   bool add_framebuffer_expectation_;

ui/ozone/public/surface_ozone_egl.h

@@ -52,8 +52,9 @@ class OZONE_BASE_EXPORT SurfaceOzoneEGL {
   // composition.
   // |buffer| to be presented by the overlay.
   // |display_bounds| specify where it is supposed to be on the screen.
-  // |crop_rect| specifies the region within the buffer to be placed inside
-  // |display_bounds|.
+  // |crop_rect| specifies the region within the buffer to be placed
+  // inside |display_bounds|. This is specified in texture coordinates, in the
+  // range of [0,1].
   virtual bool ScheduleOverlayPlane(int plane_z_order,
                                     gfx::OverlayTransform plane_transform,
                                     scoped_refptr<NativePixmap> buffer,