From debd1cbcd488becc629293cfcc4fc5b2ee4ef8b2 Mon Sep 17 00:00:00 2001
From: Vishnu Nair <vishnun@google.com>
Date: Tue, 16 Mar 2021 10:06:01 -0700
Subject: Remove legacy disable triple buffering config

The config changes the dequeue limit of BQ (setMaxDequeuedBufferCount) from 2 to 1,  decreasing the default size of the queue from (3 to 2).
Some of the motivations behind this change include:
- not applicable in most scenarios since producers in the system override this
- breaks async mode, not well tested in other scenarios
- simplifying some of the implementation and removes a configuration/flag.

Clients can still manually call setMaxDequeuedBufferCount if they wish.

Test: presubmit
Fixes: 182314340
Change-Id: Iea88e8a795b91ff325610cfb1eefbcfe6e434841
---
 libs/gui/BLASTBufferQueue.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

(limited to 'libs/gui/BLASTBufferQueue.cpp')

diff --git a/libs/gui/BLASTBufferQueue.cpp b/libs/gui/BLASTBufferQueue.cpp
index 82c9268feb..9490314b71 100644
--- a/libs/gui/BLASTBufferQueue.cpp
+++ b/libs/gui/BLASTBufferQueue.cpp
@@ -130,8 +130,7 @@ void BLASTBufferItemConsumer::onSidebandStreamChanged() {
 }
 
 BLASTBufferQueue::BLASTBufferQueue(const std::string& name, const sp<SurfaceControl>& surface,
-                                   int width, int height, int32_t format,
-                                   bool enableTripleBuffering)
+                                   int width, int height, int32_t format)
       : mName(name),
         mSurfaceControl(surface),
         mSize(width, height),
@@ -143,9 +142,8 @@ BLASTBufferQueue::BLASTBufferQueue(const std::string& name, const sp<SurfaceCont
     // explicitly so that dequeueBuffer will block
     mProducer->setDequeueTimeout(std::numeric_limits<int64_t>::max());
 
-    if (enableTripleBuffering) {
-        mProducer->setMaxDequeuedBufferCount(2);
-    }
+    // safe default, most producers are expected to override this
+    mProducer->setMaxDequeuedBufferCount(2);
     mBufferItemConsumer = new BLASTBufferItemConsumer(mConsumer,
                                                       GraphicBuffer::USAGE_HW_COMPOSER |
                                                               GraphicBuffer::USAGE_HW_TEXTURE,
-- 
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