Closed
Description
To support something like annotation_raster()
in our R package, which would lead to awesomeness such as conversion of ggmap (people have been asking for this for a long time), I need support for displaying a matrix of arbitrary color codes. Using a heatmap seems out of the question since we can't generate a sensible colorscale, and drawing a marker for each cell seems inefficient. Any thoughts on how to approach this?