drm_hwcomposer: Add platformmeson for Amlogic SoC support

This specific platform handler is dedicated for the Amlogic SoC,
and more precisely for the Amlogic G12A family.

OpenGL/Mali allocation is done via a slightly modified ARM Gralloc
module, thus needing a custom platform handler to handle the custom
private_handle_t structure.

This platformmeson is based on platformhisi without the AFBC YUV
management (not handled by the Amlogic SoCs).

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

Change-Id: I1a1d20b0a84b0e17aa3417c8e9633712f258523d
diff --git a/platformmeson.h b/platformmeson.h
new file mode 100644
index 0000000..7be7702
--- /dev/null
+++ b/platformmeson.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_PLATFORM_HISI_H_
+#define ANDROID_PLATFORM_HISI_H_
+
+#include "drmdevice.h"
+#include "platform.h"
+#include "platformdrmgeneric.h"
+
+#include <stdatomic.h>
+
+#include <hardware/gralloc.h>
+
+namespace android {
+
+class MesonImporter : public DrmGenericImporter {
+ public:
+  using DrmGenericImporter::DrmGenericImporter;
+
+  int ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) override;
+  bool CanImportBuffer(buffer_handle_t handle) override;
+
+ private:
+  uint64_t ConvertGrallocFormatToDrmModifiers(uint64_t flags);
+};
+}  // namespace android
+
+#endif