Something I've seen (with all embedded GUI software) is the need for more speed and support for more art asset types. I've written my own imaging codecs (originally for PC). Recently I created new versions that are optimized to run on constrained targets like STM32 MCUs. These include JPEG, PNG, GIF, TIFF, BMP, MPEG, H.263.
Besides being faster than the code distributed with TouchGFX (e.g. libjpeg), my codecs require less RAM and can take advantage of DMA to move pixels to the display while the CPU is decoding the next set. If there is enough interest, I can make this code available for STM32 and TouchGFX. The main impediment is that I don't have a business need to work on this.
