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/Android.bp b/Android.bp
index e7a77bd..a8d95eb 100644
--- a/Android.bp
+++ b/Android.bp

@@ -39,6 +39,7 @@
 
     static_libs: [
         "libaidlcommonsupport",
+        "libdisplay_info",
     ],
 
     header_libs: [
@@ -51,6 +52,7 @@
     ],
 
     cppflags: [
+        "-DHAS_LIBDISPLAY_INFO",
         "-DHWC2_INCLUDE_STRINGIFICATION",
         "-DHWC2_USE_CPP11",
     ],

diff --git a/drm/DrmConnector.cpp b/drm/DrmConnector.cpp
index 6dbe3c5..6be4067 100644
--- a/drm/DrmConnector.cpp
+++ b/drm/DrmConnector.cpp

@@ -89,6 +89,12 @@
   }
 
   UpdateEdidProperty();
+#if HAS_LIBDISPLAY_INFO
+  auto edid = LibdisplayEdidWrapper::Create(GetEdidBlob());
+  edid_wrapper_ = edid ? std::move(edid) : std::make_unique<EdidWrapper>();
+#else
+  edid_wrapper_ = std::make_unique<EdidWrapper>();
+#endif
 
   if (IsWriteback() &&
       (!GetConnectorProperty("WRITEBACK_PIXEL_FORMATS",
@@ -128,7 +134,8 @@
                                       colorspace_enum_map_);
     colorspace_property_.AddEnumToMap("RGB_WIDE_FIXED", Colorspace::kRgbWideFixed,
                                       colorspace_enum_map_);
-    colorspace_property_.AddEnumToMap("RGB_WIDE_FLOAT", Colorspace::kRgbWideFloat,
+    colorspace_property_.AddEnumToMap("RGB_WIDE_FLOAT",
+                                      Colorspace::kRgbWideFloat,
                                       colorspace_enum_map_);
     colorspace_property_.AddEnumToMap("BT601_YCC", Colorspace::kBt601Ycc,
                                       colorspace_enum_map_);

diff --git a/drm/DrmConnector.h b/drm/DrmConnector.h
index e49cee0..fc17206 100644
--- a/drm/DrmConnector.h
+++ b/drm/DrmConnector.h

@@ -27,11 +27,14 @@
 #include "DrmProperty.h"
 #include "DrmUnique.h"
 #include "compositor/DisplayInfo.h"
+#include "utils/EdidWrapper.h"
 
 namespace android {
 
 class DrmDevice;
 
+using EdidWrapperUnique = std::unique_ptr<EdidWrapper>;
+
 class DrmConnector : public PipelineBindable<DrmConnector> {
  public:
   static auto CreateInstance(DrmDevice &dev, uint32_t connector_id,
@@ -42,6 +45,9 @@
 
   int UpdateEdidProperty();
   auto GetEdidBlob() -> DrmModePropertyBlobUnique;
+  auto GetParsedEdid() -> EdidWrapperUnique & {
+    return edid_wrapper_;
+  }
 
   auto GetDev() const -> DrmDevice & {
     return *drm_;
@@ -152,6 +158,8 @@
     return GetConnectorProperty(prop_name, property, /*is_optional=*/true);
   }
 
+  EdidWrapperUnique edid_wrapper_;
+
   const uint32_t index_in_res_array_;
 
   std::vector<DrmMode> modes_;

diff --git a/hwc2_device/HwcDisplay.h b/hwc2_device/HwcDisplay.h
index ad58ae8..01ea33d 100644
--- a/hwc2_device/HwcDisplay.h
+++ b/hwc2_device/HwcDisplay.h

@@ -297,6 +297,9 @@
   HWC2::Error Init();
 
   HWC2::Error SetActiveConfigInternal(uint32_t config, int64_t change_time);
+  auto GetEdid() -> EdidWrapperUnique & {
+    return GetPipe().connector->Get()->GetParsedEdid();
+  }
 };
 
 }  // namespace android

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