On Mar 21, 2014, at 3:53 AM, Remco Poelstra <re...@beryllium.net> wrote:
> Hi, > > I'm working on an iOS app which needs to draw paths. Drawing is performed in > layers, each layer having its own color. Some paths add (opaque) content, > while some paths remove content (i.e. draw in a clear color). Content removal > should only happen on a per layer basis. This model fits exactly with > CALayer, with a CALayer for each drawing layer. > The drawing layers can contain up to 30000 paths. > Since I want to be able to zoom in, I'm using CATiledLayer. Unfortunately > CATiledLayer does not allow sub layers. Thats news. What makes you believe this? > Now I can create a container layer which contains all the drawing layers as > sublayers and call [containerLayer renderInContext:], to render it to the > CATiledLayer, but it will render the complete layer for each and every tile. > So performance drops considerably. I also noticed that this route only works > with CAShapeLayers for each path. A custom drawInContext: does not get > invoked. > If I render all paths directly to the CATiledLayer and check the bounding > boxes against the clipbox I get reasonable performance, but paths drawn in > clear color will remove all content below them, not only content from the > same drawing layer. > Is there some way to render a container layer to a CATiledLayer while keeping > any knowledge about the clipping path (i.e. skipping over any paths which are > outside the clip bounds)? > > Thanks in advance. > > Kind regards, > > Remco Poelstra > > > _______________________________________________ > > 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/david.duncan%40apple.com > > This email sent to david.dun...@apple.com -- David Duncan _______________________________________________ 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
