Transfer HWC release fences to BufferQueue
After a HWC set, each SurfaceFlinger Layer retrieves the release fence
HWC returned and gives it to the layer's SurfaceTexture. The
SurfaceTexture accumulates the fences into a merged fence until the
next updateTexImage, then passes the merged fence to the BufferQueue
in releaseBuffer.
In a follow-on change, BufferQueue will return the fence along with
the buffer slot in dequeueBuffer. For now, dequeueBuffer waits for the
fence to signal before returning.
The releaseFence default value for BufferQueue::releaseBuffer() is
temporary to avoid transient build breaks with a multi-project
checkin. It'll disappear in the next change.
Change-Id: Iaa9a0d5775235585d9cbf453d3a64623d08013d9
diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.cpp b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
index 385be63..7c09ab2 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
@@ -346,6 +346,10 @@
virtual uint32_t getHints() const {
return getLayer()->hints;
}
+ virtual int getAndResetReleaseFenceFd() {
+ // not supported on VERSION_03
+ return -1;
+ }
virtual void setDefaultState() {
getLayer()->compositionType = HWC_FRAMEBUFFER;
@@ -407,6 +411,11 @@
virtual uint32_t getHints() const {
return getLayer()->hints;
}
+ virtual int getAndResetReleaseFenceFd() {
+ int fd = getLayer()->releaseFenceFd;
+ getLayer()->releaseFenceFd = -1;
+ return fd;
+ }
virtual void setDefaultState() {
getLayer()->compositionType = HWC_FRAMEBUFFER;