commit 6a765203ab72fb40685288827f35e8ff67aa9c54
author Roman Stratiienko <r.stratiienko@gmail.com> Fri Feb 14 07:07:17 2025 +0200
committer Roman Stratiienko <r.stratiienko@gmail.com> Tue Feb 18 22:58:58 2025 +0200
tree 74208d26f0a095224647d29ef89dc1387a661cae
parent ee6d843ef8960d656d48f379f66b07cc2b27801c

drm_hwcomposer: HWC3: Support batched commands for layer create/destroy

This feature aims to reduce CPU time by reducing the number of SF<->HWC
binder transactions.

See [this SF commit][1] for more information.

[1]: https://android.googlesource.com/platform/frameworks/native/+/96f866c272765474f0f28b4090e15092f55796d8
Change-Id: I5eb1934b614ffabffed077d925c64946fae09050
Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>

hwc3/Composer.cpp

diff --git a/hwc3/Composer.cpp b/hwc3/Composer.cpp
index 28d096c..de875db 100644
--- a/hwc3/Composer.cpp
+++ b/hwc3/Composer.cpp
@@ -79,6 +79,10 @@
     caps->emplace_back(Capability::PRESENT_FENCE_IS_NOT_RELIABLE);
   }
 
+#if __ANDROID_API__ >= 35
+  caps->emplace_back(Capability::LAYER_LIFECYCLE_BATCH_COMMAND);
+#endif
+
   return ndk::ScopedAStatus::ok();
 }
 

hwc3/ComposerClient.cpp

diff --git a/hwc3/ComposerClient.cpp b/hwc3/ComposerClient.cpp
index 09d8817..63a3d84 100644
--- a/hwc3/ComposerClient.cpp
+++ b/hwc3/ComposerClient.cpp
@@ -563,6 +563,24 @@
     return;
   }
 
+#if __ANDROID_API__ >= 35
+  auto batch_command = command.layerLifecycleBatchCommandType;
+  if (batch_command == LayerLifecycleBatchCommandType::CREATE) {
+    if (!display->CreateLayer(command.layer)) {
+      cmd_result_writer_->AddError(hwc3::Error::kBadLayer);
+      return;
+    }
+  }
+
+  if (batch_command == LayerLifecycleBatchCommandType::DESTROY) {
+    if (!display->DestroyLayer(command.layer)) {
+      cmd_result_writer_->AddError(hwc3::Error::kBadLayer);
+    }
+
+    return;
+  }
+#endif
+
   auto* layer = display->get_layer(command.layer);
   if (layer == nullptr) {
     cmd_result_writer_->AddError(hwc3::Error::kBadLayer);