In order to render emoji, we need to populate a glyph atlas using an SkCanvas. The software rasterization of these images (frequently pngs) is quite slow and may not be necessary, depending on how the OS APis works. If we are able to load an emoji at the correct scale, it would be advantageous to bypass the software canvas, load the png into a host buffer and blit onto our atlas.

If we need to resize the image, then there may be faster routes than software but its probably less clear.