On 7/27/12, Jens Alfke <j...@mooseyard.com> wrote: > Keep in mind that accessing the image pixels directly can hurt drawing > performance. Your code can only access the pixmap if it's in system RAM, > while GPU acceleration requires that the pixmap be in VRAM. So messing with > the pixels may either cause the pixmap to be copied back and forth, or force > CoreGraphics to degrade to software rendering. > > —Jens
Jens is correct that the way you are implying you want to access pixels will hurt performance. So this is what shaders are for. If want fast access that will immediately be rendered, use OpenGL shaders or Core Image (an Apple framework). -Eric -- Beginning iPhone Games Development http://playcontrol.net/iphonegamebook/ _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
