Merge "RenderEngine: Limit the size of blur input to the display size" into udc-dev

            if (!blurInput) {

                blurInput = activeSurface->makeImageSnapshot();

            }

            // rect to be blurred in the coordinate space of blurInput

            const auto blurRect = canvas->getTotalMatrix().mapRect(bounds.rect());

            SkRect blurRect = canvas->getTotalMatrix().mapRect(bounds.rect());

            // Some layers may be much bigger than the screen. If we used

            // `blurRect` directly, this would allocate a large buffer with no

            // benefit. Apply the clip, which already takes the display size

            // into account. The clipped size will then be used to calculate the

            // size of the buffer we will create for blurring.

            if (!blurRect.intersect(SkRect::Make(canvas->getDeviceClipBounds()))) {

                // This should not happen, but if it did, we would use the full

                // sized layer, which should still be fine.

                ALOGW("blur bounds does not intersect display clip!");

            }

            // if the clip needs to be applied then apply it now and make sure

            // it is restored before we attempt to draw any shadows.