Methods and apparatuses to reduce the number of scaling engines used in a display controller that displays image content associated with a plurality of image sources on a screen are provided. A first multiplexer may receive image content from a plurality of storage devices, and select first image content from one of the plurality of image sources. A first scaling engine may process the selected first image content, wherein a plurality of multiplexers can receives an output of the first scaling engine and the image content from the plurality of storage devices, respectively. Each one of the plurality of multiplexers may output either the image content input to the multiplexer or the output of the first scaling engine depending on which image content was scaled by the first scaling engine. Additionally, a plurality of post-processors may perform additional post-processing on the output of the plurality of multiplexer, respectively.