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I think there's already tools out there to do this for Adafruit_GFX and/or TFT_eSPI but this one will allow you to embed JPG streams too to save flash space, and it also supports htcw_gfx out of the box.
Yes but the point was that you don't have to use a seperate tool to embed images, you can use standard jpgs and use functionality already included with esp-idf. It supports all the esp32-family and this is the esp32 subreddit so I suspect that's good enough for most here. Mika even used it to play video with mjpeg from a sd-card. Embedding files as headers quickly fills up the program flash so it's nice to be able to use expandable storage. And TJpgDec is platform independent as you probably know since you say you included it in your library. It's available for arduino as well.
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