func (i *Image) Pixels(context *opengl.Context) ([]uint8, error) {
// Flush the enqueued commands so that pixels are certainly read.
if err := theCommandQueue.Flush(context); err != nil {
return nil, err
}
f, err := i.createFramebufferIfNeeded(context)
if err != nil {
return nil, err
}
return context.FramebufferPixels(f.native, i.width, i.height)
}