1 files changed, 25 insertions, 0 deletions
diff --git a/services/surfaceflinger/BufferStateLayer.cpp b/services/surfaceflinger/BufferStateLayer.cpp
index 6f344c721a..f85151449b 100644
--- a/services/surfaceflinger/BufferStateLayer.cpp
+++ b/services/surfaceflinger/BufferStateLayer.cpp
@@ -744,6 +744,31 @@ Layer::RoundedCornerState BufferStateLayer::getRoundedCornerState() const {
                                         static_cast<float>(s.active.transform.ty() + s.active.h)),
                               radius);
 }
+
+bool BufferStateLayer::bufferNeedsFiltering() const {
+    const State& s(getDrawingState());
+    if (!s.buffer) {
+        return false;
+    }
+
+    uint32_t bufferWidth = s.buffer->width;
+    uint32_t bufferHeight = s.buffer->height;
+
+    // Undo any transformations on the buffer and return the result.
+    if (s.transform & ui::Transform::ROT_90) {
+        std::swap(bufferWidth, bufferHeight);
+    }
+
+    if (s.transformToDisplayInverse) {
+        uint32_t invTransform = DisplayDevice::getPrimaryDisplayRotationFlags();
+        if (invTransform & ui::Transform::ROT_90) {
+            std::swap(bufferWidth, bufferHeight);
+        }
+    }
+
+    const Rect layerSize{getBounds()};
+    return layerSize.width() != bufferWidth || layerSize.height() != bufferHeight;
+}
 } // namespace android
 
 // TODO(b/129481165): remove the #pragma below and fix conversion issues