commit c7a25adf66b138de66814383540905b83cf12a01
author Dan Stoza <stoza@google.com> Thu Apr 12 11:45:09 2018 -0700
committer Dan Stoza <stoza@google.com> Thu Apr 12 12:01:55 2018 -0700
tree 731fdd8569b2f725168d0a1b90fbe5fb5f7418a9
parent f0747473495c6d72cdad96baf04f5c0807daf32b

SF: Fix repaint everything logic

This solves the same problem with dirty regions not being updated
as Ia7a3dc15c96626a213c4459dac4f695d91540fb5, but it is better in a
couple of ways:

  1) It no longer updates dirty regions from a binder thread, which was
     likely causing the memory corruption in b/77919748.
  2) It removes the distinction between repaintEverything and
     repaintEverythingLocked, which is not necessary since both
     operations in repaintEverything (updating an atomic and signaling a
     transaction) are threadsafe.

Bug: 77335744
Bug: 77546473
Bug: 77919748
Test: Manual - on an ASAN build, played TouchLatency bouncy ball while
      toggling between GL and HWC composition; doesn't crash whereas it
      would crash in a matter of a couple minutes before

Change-Id: Iecadfecb40e87e400a301de2dcad1664e154982d

services/surfaceflinger/SurfaceFlinger.cpp

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index a8680e2..726d155 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1387,7 +1387,7 @@
     if (sequenceId != getBE().mComposerSequenceId) {
         return;
     }
-    repaintEverythingLocked();
+    repaintEverything();
 }
 
 void SurfaceFlinger::setVsyncEnabled(int disp, int enabled) {
@@ -1949,7 +1949,7 @@
     ALOGV("setUpHWComposer");
 
     for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
-        bool dirty = !mDisplays[dpy]->getDirtyRegion(false).isEmpty();
+        bool dirty = !mDisplays[dpy]->getDirtyRegion(mRepaintEverything).isEmpty();
         bool empty = mDisplays[dpy]->getVisibleLayersSortedByZ().size() == 0;
         bool wasEmpty = !mDisplays[dpy]->lastCompositionHadVisibleLayers;
 
@@ -3716,7 +3716,7 @@
 
         mVisibleRegionsDirty = true;
         mHasPoweredOff = true;
-        repaintEverythingLocked();
+        repaintEverything();
 
         struct sched_param param = {0};
         param.sched_priority = 1;
@@ -4637,20 +4637,9 @@
     return err;
 }
 
-void SurfaceFlinger::repaintEverythingLocked() {
-    android_atomic_or(1, &mRepaintEverything);
-    for (size_t dpy = 0; dpy < mDisplays.size(); dpy++) {
-        const sp<DisplayDevice>& displayDevice(mDisplays[dpy]);
-        const Rect bounds(displayDevice->getBounds());
-        displayDevice->dirtyRegion.orSelf(Region(bounds));
-    }
-    signalTransaction();
-}
-
 void SurfaceFlinger::repaintEverything() {
-    ConditionalLock _l(mStateLock,
-            std::this_thread::get_id() != mMainThreadId);
-    repaintEverythingLocked();
+    android_atomic_or(1, &mRepaintEverything);
+    signalTransaction();
 }
 
 // A simple RAII class to disconnect from an ANativeWindow* when it goes out of scope