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This additional surface is needed when using opaque MediaCodec direct rendering since the main surface is owned by MediaCodec and cannot be used for blending or with OpenGL ES. If this HW acceleration mode is disabled, the visibility of this surface is set to INVISIBLE since overlaying a transparent SurfaceView on top of another might not be supported on all devices. Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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