drm_hwcomposer: Add rcar-du display backend

ABGR8888 pixel format and layer scaling are unsupported for rcar-du
KMS DRI card. Handle it by overriding the IsClientLayer method for
additional checks.

Signed-off-by: Matvii Zorin <matvii.zorin@globallogic.com>

Android.bp

@@ -98,6 +98,7 @@ cc_library_static {
         "backend/backendmanager.cpp",
         "backend/displaybackend.cpp",
         "backend/displaybackendclient.cpp",
+        "backend/displaybackendrcardu.cpp",
     ],
 }
 

backend/displaybackendrcardu.cpp

+#include "displaybackendrcardu.h"
+#include "backendmanager.h"
+#include "drm_fourcc.h"
+
+namespace android {
+
+bool DisplayBackendRCarDu::IsClientLayer(DrmHwcTwo::HwcLayer *layer) {
+  hwc_drm_bo_t bo;
+
+  int ret = importer_->ConvertBoInfo(layer->buffer(), &bo);
+  if (ret)
+    return true;
+
+  if (bo.format == DRM_FORMAT_ABGR8888)
+    return true;
+
+  if (layer->RequireScalingOrPhasing())
+    return true;
+
+  return DisplayBackend::IsClientLayer(layer);
+}
+
+REGISTER_DISPLAY_BACKEND("rcar-du", DisplayBackendRCarDu);
+
+}  // namespace android

include/displaybackendrcardu.h

+#ifndef HWC_DISPLAY_BACKEND_RCAR_DU_H
+#define HWC_DISPLAY_BACKEND_RCAR_DU_H
+
+#include "displaybackend.h"
+#include "drmhwctwo.h"
+
+namespace android {
+
+class DisplayBackendRCarDu : public DisplayBackend {
+ public:
+  using DisplayBackend::DisplayBackend;
+  bool IsClientLayer(DrmHwcTwo::HwcLayer *layer) override;
+};
+}  // namespace android
+
+#endif