drm_hwcomposer: Small refactor of ImportLayerBuffer

Move the fence dup into this helper function as well, making the output
of the function a HwcLayer::Buffer struct.

Change-Id: If18c9aa0b3e20d88bdca82e4ec375cb6f20205dd
Signed-off-by: Drew Davenport <ddavenport@google.com>

hwc3/ComposerClient.cpp

diff --git a/hwc3/ComposerClient.cpp b/hwc3/ComposerClient.cpp
index 9b4d76f..b7c92a8 100644
--- a/hwc3/ComposerClient.cpp
+++ b/hwc3/ComposerClient.cpp
@@ -553,13 +553,11 @@
   if (command.buffer) {
     HwcLayer::Buffer buffer;
     auto err = ImportLayerBuffer(display_id, command.layer, *command.buffer,
-                                 &buffer.buffer_handle);
+                                 &buffer);
     if (err != hwc3::Error::kNone) {
       cmd_result_writer_->AddError(err);
       return;
     }
-    buffer.acquire_fence = ::android::MakeSharedFd(
-        command.buffer->fence.dup().release());
     properties.buffer.emplace(buffer);
   }
 
@@ -1305,15 +1303,16 @@
   return binder;
 }
 
-hwc3::Error ComposerClient::ImportLayerBuffer(
-    int64_t display_id, int64_t layer_id, const Buffer& buffer,
-    buffer_handle_t* out_imported_buffer) {
-  *out_imported_buffer = nullptr;
-
+hwc3::Error ComposerClient::ImportLayerBuffer(int64_t display_id,
+                                              int64_t layer_id,
+                                              const Buffer& buffer,
+                                              HwcLayer::Buffer* out_buffer) {
   auto releaser = composer_resources_->CreateResourceReleaser(true);
   auto err = composer_resources_->GetLayerBuffer(display_id, layer_id, buffer,
-                                                 out_imported_buffer,
+                                                 &out_buffer->buffer_handle,
                                                  releaser.get());
+  out_buffer->acquire_fence = ::android::MakeSharedFd(
+      buffer.fence.dup().release());
   return err;
 }
 

hwc3/ComposerClient.h

diff --git a/hwc3/ComposerClient.h b/hwc3/ComposerClient.h
index 20d15b4..5938ceb 100644
--- a/hwc3/ComposerClient.h
+++ b/hwc3/ComposerClient.h
@@ -20,6 +20,7 @@
 
 #include "aidl/android/hardware/graphics/composer3/BnComposerClient.h"
 #include "aidl/android/hardware/graphics/composer3/LayerCommand.h"
+#include "hwc2_device/HwcLayer.h"
 #include "hwc3/CommandResultWriter.h"
 #include "hwc3/ComposerResources.h"
 #include "hwc3/Utils.h"
@@ -29,10 +30,7 @@
 using AidlNativeHandle = aidl::android::hardware::common::NativeHandle;
 
 namespace android {
-
 class HwcDisplay;
-class HwcLayer;
-
 }  // namespace android
 
 namespace aidl::android::hardware::graphics::composer3::impl {
@@ -163,7 +161,7 @@
  private:
   hwc3::Error ImportLayerBuffer(int64_t display_id, int64_t layer_id,
                                 const Buffer& buffer,
-                                buffer_handle_t* out_imported_buffer);
+                                ::android::HwcLayer::Buffer* out_buffer);
 
   // Layer commands
   void DispatchLayerCommand(int64_t display_id, const LayerCommand& command);