drm_hwcomposer: Add wrapper for EDID parsing
Use libdisplay-info to parse display EDID. Wrap the parsing logic in a
class to extract specific EDID information.
Change-Id: I20376eb96ebcd0073155cedf1e8f055bbf8dfb49
Signed-off-by: Sasha McIntosh <sashamcintosh@google.com>
diff --git a/utils/EdidWrapper.h b/utils/EdidWrapper.h
new file mode 100644
index 0000000..3552001
--- /dev/null
+++ b/utils/EdidWrapper.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2025 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.
+ */
+
+#pragma once
+
+#define LOG_TAG "drmhwc"
+
+#if HAS_LIBDISPLAY_INFO
+extern "C" {
+#include <libdisplay-info/info.h>
+}
+#endif
+
+#include "drm/DrmUnique.h"
+#include "utils/log.h"
+
+namespace android {
+
+// Stub wrapper class for edid parsing
+class EdidWrapper {
+ public:
+ EdidWrapper() = default;
+ EdidWrapper(const EdidWrapper &) = delete;
+ virtual ~EdidWrapper() = default;
+};
+
+#if HAS_LIBDISPLAY_INFO
+// Wrapper class for that uses libdisplay-info to parse edids
+class LibdisplayEdidWrapper final : public EdidWrapper {
+ public:
+ LibdisplayEdidWrapper() = delete;
+ LibdisplayEdidWrapper(di_info *info) : info_(info) {
+ }
+ ~LibdisplayEdidWrapper() override {
+ di_info_destroy(info_);
+ }
+ static auto Create(DrmModePropertyBlobUnique blob)
+ -> std::unique_ptr<LibdisplayEdidWrapper> {
+ if (!blob)
+ return nullptr;
+
+ auto *info = di_info_parse_edid(blob->data, blob->length);
+ if (!info) {
+ ALOGW("Failed to parse edid blob.");
+ return nullptr;
+ }
+
+ return std::make_unique<LibdisplayEdidWrapper>(std::move(info));
+ }
+
+ private:
+ di_info *info_{};
+};
+#endif
+
+} // namespace android