From e611a6ed33d157b7ae15bdfe4e1873dc20ce7d48 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Tue, 15 Sep 2009 19:10:47 -0700
Subject: fix [2122448] android_native_window_t::setUsage() only reallocates
 the first buffer

Take 2. We needed to check that the usage flags are "good enough" as opposed to "the same".

This reverts commit 8f17a762fe9e9f31e4e86cb60ff2bfb6b10fdee6.
---
 libs/ui/Surface.cpp | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

(limited to 'libs/ui/Surface.cpp')

diff --git a/libs/ui/Surface.cpp b/libs/ui/Surface.cpp
index c3fbea271fd7..64522fb6c374 100644
--- a/libs/ui/Surface.cpp
+++ b/libs/ui/Surface.cpp
@@ -361,7 +361,6 @@ void Surface::init()
     const_cast<uint32_t&>(android_native_window_t::flags) = 0;
     // be default we request a hardware surface
     mUsage = GRALLOC_USAGE_HW_RENDER;
-    mUsageChanged = true;
     mNeedFullUpdate = false;
 }
 
@@ -498,14 +497,14 @@ int Surface::dequeueBuffer(android_native_buffer_t** buffer)
         LOGE("error dequeuing a buffer (%s)", strerror(bufIdx));
         return bufIdx;
     }
-    
-    // FIXME: in case of failure below, we need to undo the dequeue
-    
-    uint32_t usage;
-    const bool usageChanged = getUsage(&usage);
+
+    // below we make sure we AT LEAST have the usage flags we want
+    const uint32_t usage(getUsage());
     const sp<SurfaceBuffer>& backBuffer(mBuffers[bufIdx]);
-    if ((backBuffer == 0) || usageChanged || 
-            mSharedBufferClient->needNewBuffer(bufIdx)) {
+    if (backBuffer == 0 || 
+        ((uint32_t(backBuffer->usage) & usage) != usage) ||
+        mSharedBufferClient->needNewBuffer(bufIdx)) 
+    {
         err = getBufferLocked(bufIdx, usage);
         LOGE_IF(err, "getBufferLocked(%ld, %08x) failed (%s)",
                 bufIdx, usage, strerror(-err));
@@ -600,21 +599,13 @@ int Surface::perform(int operation, va_list args)
 void Surface::setUsage(uint32_t reqUsage)
 {
     Mutex::Autolock _l(mSurfaceLock);
-    if (mUsage != reqUsage) {
-        mUsageChanged = true;
-        mUsage = reqUsage;
-    }
+    mUsage = reqUsage;
 }
 
-bool Surface::getUsage(uint32_t* usage)
+uint32_t Surface::getUsage() const
 {
     Mutex::Autolock _l(mSurfaceLock);
-    *usage = mUsage;
-    if (mUsageChanged) {
-        mUsageChanged = false;
-        return true;
-    }
-    return false;
+    return mUsage;
 }
 
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