ozone/drm: Only reuse ScanoutBuffers with compatible modifiers

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

Index: ui/ozone/platform/drm/gpu/screen_manager_unittest.cc
diff --git a/ui/ozone/platform/drm/gpu/screen_manager_unittest.cc b/ui/ozone/platform/drm/gpu/screen_manager_unittest.cc
index c35b3808ccbdf90115917cbcfea8eff747de4763..de0c7179dceb028f7073456eeff809f716eef8c6 100644
--- a/ui/ozone/platform/drm/gpu/screen_manager_unittest.cc
+++ b/ui/ozone/platform/drm/gpu/screen_manager_unittest.cc
@@ -16,7 +16,7 @@
 #include "ui/ozone/platform/drm/gpu/drm_window.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
 #include "ui/ozone/platform/drm/gpu/mock_drm_device.h"
-#include "ui/ozone/platform/drm/gpu/mock_dumb_buffer_generator.h"
+#include "ui/ozone/platform/drm/gpu/mock_scanout_buffer_generator.h"
 #include "ui/ozone/platform/drm/gpu/screen_manager.h"
 
 namespace {
@@ -51,9 +51,10 @@ class ScreenManagerTest : public testing::Test {
   }
 
   void SetUp() override {
-    drm_ = new ui::MockDrmDevice();
+    drm_ = new ui::MockDrmDevice(false, std::vector<uint32_t>(1, kPrimaryCrtc),
+                                 4 /* planes per crtc */);
     device_manager_.reset(new ui::DrmDeviceManager(nullptr));
-    buffer_generator_.reset(new ui::MockDumbBufferGenerator());
+    buffer_generator_.reset(new ui::MockScanoutBufferGenerator());
     screen_manager_.reset(new ui::ScreenManager(buffer_generator_.get()));
   }
   void TearDown() override {
@@ -64,7 +65,7 @@ class ScreenManagerTest : public testing::Test {
  protected:
   scoped_refptr<ui::MockDrmDevice> drm_;
   std::unique_ptr<ui::DrmDeviceManager> device_manager_;
-  std::unique_ptr<ui::MockDumbBufferGenerator> buffer_generator_;
+  std::unique_ptr<ui::MockScanoutBufferGenerator> buffer_generator_;
   std::unique_ptr<ui::ScreenManager> screen_manager_;
 
  private:
@@ -516,3 +517,33 @@ TEST_F(ScreenManagerTest, EnableControllerWhenWindowHasBuffer) {
   window = screen_manager_->RemoveWindow(1);
   window->Shutdown();
 }
+
+TEST_F(ScreenManagerTest, RejectBufferWithIncompatibleModifiers) {
+  std::unique_ptr<ui::DrmWindow> window(
+      new ui::DrmWindow(1, device_manager_.get(), screen_manager_.get()));
+  window->Initialize(buffer_generator_.get());
+  window->SetBounds(GetPrimaryBounds());
+  scoped_refptr<ui::ScanoutBuffer> buffer =
+      buffer_generator_->CreateWithModifier(drm_, DRM_FORMAT_XRGB8888,
+                                            I915_FORMAT_MOD_X_TILED,
+                                            GetPrimaryBounds().size());
+
+  window->SchedulePageFlip(
+      std::vector<ui::OverlayPlane>(1, ui::OverlayPlane(buffer)),
+      base::Bind(&EmptySwapCallback));
+  screen_manager_->AddWindow(1, std::move(window));
+
+  screen_manager_->AddDisplayController(drm_, kPrimaryCrtc, kPrimaryConnector);
+  screen_manager_->ConfigureDisplayController(
+      drm_, kPrimaryCrtc, kPrimaryConnector, GetPrimaryBounds().origin(),
+      kDefaultMode);
+
+  // ScreenManager::GetModesetBuffer (called to get a buffer to
+  // modeset the new controller) should reject the buffer with
+  // I915_FORMAT_MOD_X_TILED modifier we created above and the two
+  // framebuffer IDs should be different.
+  EXPECT_NE(buffer->GetFramebufferId(), drm_->current_framebuffer());
+
+  window = screen_manager_->RemoveWindow(1);
+  window->Shutdown();
+}