From a2eb34cfbe089deb9a519e9702e17d9dfe26f9e8 Mon Sep 17 00:00:00 2001
From: Ian Elliott <ianelliott@google.com>
Date: Tue, 18 Jul 2017 11:05:49 -0600
Subject: Have the Surface class track the buffer age.

Have the Surface class track the buffer age, so that Surface::query()
can return the buffer age without having to use a binder call to
BufferQueueProducer::query().  The idea is for
BufferQueueProducer::dequeueBuffer() to return the value, which the
Surface class will cache for later use by Surface::query().

Bug: b/27903668
Test: Use systrace to no ensure query binder call after dequeueBuffer.
Change-Id: I106a7bd27461d381f0bd84df70d804de56a128ab
(cherry picked from commit d11b044864be525a1646f93106ab496195bb8239)
---
 libs/gui/IGraphicBufferProducer.cpp | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

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

diff --git a/libs/gui/IGraphicBufferProducer.cpp b/libs/gui/IGraphicBufferProducer.cpp
index 1b0fe06810..8406a52544 100644
--- a/libs/gui/IGraphicBufferProducer.cpp
+++ b/libs/gui/IGraphicBufferProducer.cpp
@@ -124,9 +124,9 @@ public:
         return result;
     }
 
-    virtual status_t dequeueBuffer(int *buf, sp<Fence>* fence, uint32_t width,
-            uint32_t height, PixelFormat format, uint64_t usage,
-            FrameEventHistoryDelta* outTimestamps) {
+    virtual status_t dequeueBuffer(int* buf, sp<Fence>* fence, uint32_t width, uint32_t height,
+                                   PixelFormat format, uint64_t usage, uint64_t* outBufferAge,
+                                   FrameEventHistoryDelta* outTimestamps) {
         Parcel data, reply;
         bool getFrameTimestamps = (outTimestamps != nullptr);
 
@@ -149,6 +149,17 @@ public:
             fence->clear();
             return result;
         }
+        if (outBufferAge) {
+            result = reply.readUint64(outBufferAge);
+        } else {
+            // Read the value even if outBufferAge is nullptr:
+            uint64_t bufferAge;
+            result = reply.readUint64(&bufferAge);
+        }
+        if (result != NO_ERROR) {
+            ALOGE("IGBP::dequeueBuffer failed to read buffer age: %d", result);
+            return result;
+        }
         if (getFrameTimestamps) {
             result = reply.read(*outTimestamps);
             if (result != NO_ERROR) {
@@ -516,11 +527,10 @@ public:
         return mBase->setAsyncMode(async);
     }
 
-    status_t dequeueBuffer(int* slot, sp<Fence>* fence, uint32_t w, uint32_t h,
-            PixelFormat format, uint64_t usage,
-            FrameEventHistoryDelta* outTimestamps) override {
-        return mBase->dequeueBuffer(
-                slot, fence, w, h, format, usage, outTimestamps);
+    status_t dequeueBuffer(int* slot, sp<Fence>* fence, uint32_t w, uint32_t h, PixelFormat format,
+                           uint64_t usage, uint64_t* outBufferAge,
+                           FrameEventHistoryDelta* outTimestamps) override {
+        return mBase->dequeueBuffer(slot, fence, w, h, format, usage, outBufferAge, outTimestamps);
     }
 
     status_t detachBuffer(int slot) override {
@@ -655,16 +665,18 @@ status_t BnGraphicBufferProducer::onTransact(
             uint32_t height = data.readUint32();
             PixelFormat format = static_cast<PixelFormat>(data.readInt32());
             uint64_t usage = data.readUint64();
+            uint64_t bufferAge = 0;
             bool getTimestamps = data.readBool();
 
             int buf = 0;
             sp<Fence> fence = Fence::NO_FENCE;
             FrameEventHistoryDelta frameTimestamps;
-            int result = dequeueBuffer(&buf, &fence, width, height, format,
-                    usage, getTimestamps ? &frameTimestamps : nullptr);
+            int result = dequeueBuffer(&buf, &fence, width, height, format, usage, &bufferAge,
+                                       getTimestamps ? &frameTimestamps : nullptr);
 
             reply->writeInt32(buf);
             reply->write(*fence);
+            reply->writeUint64(bufferAge);
             if (getTimestamps) {
                 reply->write(frameTimestamps);
             }
-- 
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