ozone: gbm: Add overlay support

ui/ozone/platform/dri/hardware_display_controller.cc

Index: ui/ozone/platform/dri/hardware_display_controller.cc
diff --git a/ui/ozone/platform/dri/hardware_display_controller.cc b/ui/ozone/platform/dri/hardware_display_controller.cc
index 9e79118cc478f54ef612467b7bc1cd94088433b5..9dfb6bc93d57445b0e00d2e89da6d1c174a7fd3e 100644
--- a/ui/ozone/platform/dri/hardware_display_controller.cc
+++ b/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 {
 
@@ -112,15 +113,54 @@ 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;
 }