renderTo will take opacity into account and draw renderLayerTo off-screen if there is opacity
specified, then composite that onto the context. renderLayerTo always draws at opacity=1.
- (void)renderLayerTo:(CGContextRef)context
Discussion
renderTo will take opacity into account and draw renderLayerTo off-screen if there is opacity
specified, then composite that onto the context. renderLayerTo always draws at opacity=1.