Push HWC cache slot generation down into CompositionEngine
Stop caching buffers inside SurfaceFlinger and remove the tight coupling
between SurfaceFlinger's ClientCache and the Hardware Composer cache.
This allows a better seperation of responsibility, where buffer cache
management is not split between HwcSlotGenerator and HwcBufferCache, but
is instead solely handled by HwcBufferCache.
Note that FramebufferSurface and VirtualDisplaySurface no longer use
HwcBufferCache, but instead use their own cache slot management that
is solely based on BufferQueue slot numbers.
Also do minor refactoring in FramebufferSurface to simplify code.
Bug: 258196272
Test: started and stopped multiple YouTube videos on adt4 and verified
no change in graphic buffer usage
Test: atest HwcBufferCacheTest
Test: atest OutputPrepareTest
Change-Id: Ica7955ab4bc70e3c70207390e36dff73a2fc4949
diff --git a/services/surfaceflinger/ClientCache.cpp b/services/surfaceflinger/ClientCache.cpp
index 2bd8f32..09e41ff 100644
--- a/services/surfaceflinger/ClientCache.cpp
+++ b/services/surfaceflinger/ClientCache.cpp
@@ -118,7 +118,8 @@
Usage::READABLE));
}
-void ClientCache::erase(const client_cache_t& cacheId) {
+sp<GraphicBuffer> ClientCache::erase(const client_cache_t& cacheId) {
+ sp<GraphicBuffer> buffer;
auto& [processToken, id] = cacheId;
std::vector<sp<ErasedRecipient>> pendingErase;
{
@@ -126,9 +127,11 @@
ClientCacheBuffer* buf = nullptr;
if (!getBuffer(cacheId, &buf)) {
ALOGE("failed to erase buffer, could not retrieve buffer");
- return;
+ return nullptr;
}
+ buffer = buf->buffer->getBuffer();
+
for (auto& recipient : buf->recipients) {
sp<ErasedRecipient> erasedRecipient = recipient.promote();
if (erasedRecipient) {
@@ -142,6 +145,7 @@
for (auto& recipient : pendingErase) {
recipient->bufferErased(cacheId);
}
+ return buffer;
}
std::shared_ptr<renderengine::ExternalTexture> ClientCache::get(const client_cache_t& cacheId) {