For anybody interested in playing with procedurally generated textures in Compose Desktop, take a look at https://github.com/kirill-grouchnikov/mosaic/blob/master/components/src/desktopMain/kotlin/org/pushingpixels/mosaic/utils/NoiseFactory.kt#L61 (generates an int array of pixels, applies a convolution and then converts the int array to a byte array to create a Skija / Skia bitmap out of it). Convolution is over at https://github.com/kirill-grouchnikov/mosaic/blob/master/components/src/desktopMain/kotlin/org/pushingpixels/mosaic/utils/ConvolutionUtils.kt#L46 and a more complete example of reading pixels from an image, applying a colorization pass and then creating another image out of it at https://github.com/kirill-grouchnikov/mosaic/blob/master/components/src/desktopMain/kotlin/org/pushingpixels/mosaic/painter/decoration/ImageWrapperDecorationPainter.kt#L164