1 files changed, 22 insertions, 7 deletions

diff --git a/libs/gui/BLASTBufferQueue.cpp b/libs/gui/BLASTBufferQueue.cpp
index bcdd06b6c8..e5afd408a9 100644
--- a/libs/gui/BLASTBufferQueue.cpp
+++ b/libs/gui/BLASTBufferQueue.cpp
@@ -204,13 +204,16 @@ void BLASTBufferQueue::update(const sp<SurfaceControl>& surface, uint32_t width,
     if (mRequestedSize != newSize) {
         mRequestedSize.set(newSize);
         mBufferItemConsumer->setDefaultBufferSize(mRequestedSize.width, mRequestedSize.height);
-        if (mLastBufferScalingMode != NATIVE_WINDOW_SCALING_MODE_FREEZE) {
+        if (mLastBufferInfo.scalingMode != NATIVE_WINDOW_SCALING_MODE_FREEZE) {
             // If the buffer supports scaling, update the frame immediately since the client may
             // want to scale the existing buffer to the new size.
             mSize = mRequestedSize;
-            t.setFrame(mSurfaceControl,
-                       {0, 0, static_cast<int32_t>(mSize.width),
-                        static_cast<int32_t>(mSize.height)});
+            // We only need to update the scale if we've received at least one buffer. The reason
+            // for this is the scale is calculated based on the requested size and buffer size.
+            // If there's no buffer, the scale will always be 1.
+            if (mLastBufferInfo.hasBuffer) {
+                setMatrix(&t, mLastBufferInfo);
+            }
             applyTransaction = true;
         }
     }
@@ -374,8 +377,10 @@ void BLASTBufferQueue::processNextBufferLocked(bool useNextTransaction) {
     // Ensure BLASTBufferQueue stays alive until we receive the transaction complete callback.
     incStrong((void*)transactionCallbackThunk);
 
-    mLastBufferScalingMode = bufferItem.mScalingMode;
     mLastAcquiredFrameNumber = bufferItem.mFrameNumber;
+    mLastBufferInfo.update(true /* hasBuffer */, bufferItem.mGraphicBuffer->getWidth(),
+                           bufferItem.mGraphicBuffer->getHeight(), bufferItem.mTransform,
+                           bufferItem.mScalingMode);
 
     auto releaseBufferCallback =
             std::bind(releaseBufferCallbackThunk, wp<BLASTBufferQueue>(this) /* callbackContext */,
@@ -388,8 +393,7 @@ void BLASTBufferQueue::processNextBufferLocked(bool useNextTransaction) {
                        bufferItem.mFence ? new Fence(bufferItem.mFence->dup()) : Fence::NO_FENCE);
     t->addTransactionCompletedCallback(transactionCallbackThunk, static_cast<void*>(this));
 
-    t->setFrame(mSurfaceControl,
-                {0, 0, static_cast<int32_t>(mSize.width), static_cast<int32_t>(mSize.height)});
+    setMatrix(t, mLastBufferInfo);
     t->setCrop(mSurfaceControl, computeCrop(bufferItem));
     t->setTransform(mSurfaceControl, bufferItem.mTransform);
     t->setTransformToDisplayInverse(mSurfaceControl, bufferItem.mTransformToDisplayInverse);
@@ -515,6 +519,17 @@ bool BLASTBufferQueue::rejectBuffer(const BufferItem& item) {
     return mSize != bufferSize;
 }
 
+void BLASTBufferQueue::setMatrix(SurfaceComposerClient::Transaction* t,
+                                 const BufferInfo& bufferInfo) {
+    uint32_t bufWidth = bufferInfo.width;
+    uint32_t bufHeight = bufferInfo.height;
+
+    float dsdx = mSize.width / static_cast<float>(bufWidth);
+    float dsdy = mSize.height / static_cast<float>(bufHeight);
+
+    t->setMatrix(mSurfaceControl, dsdx, 0, 0, dsdy);
+}
+
 void BLASTBufferQueue::setTransactionCompleteCallback(
         uint64_t frameNumber, std::function<void(int64_t)>&& transactionCompleteCallback) {
     std::lock_guard _lock{mMutex};