What is CGLayer?

An offscreen context for reusing content drawn with Core Graphics.

Does CGContext use GPU?

Core Graphics uses the CPU for rendering, while Core Animation uses the GPU. The first two techniques I covered in Part 1 used Core Graphics extensively (hence the high CPU utilization). Now in order to leverage the GPU, we are going to use Core Animation instead, which is responsible for all CALayer-based classes.

What is CGContext?

Overview. The CGContext type represents a Quartz 2D drawing destination. A graphics context contains drawing parameters and all device-specific information needed to render the paint on a page to the destination, whether the destination is a window in an application, a bitmap image, a PDF document, or a printer.

When should Torasterize be used?

Bottom line if you have a complex view (i.e. relatively expensive to re-render) that you are animating, but for which the animated view is not itself changing, rasterizing the layer can improve the performance by not re-rendering the layer all the time.

Where do I find the cglayer object in illustrator?

The gray portion of the box on the right side, labeled CGLayer object, represents the newly created layer. Before you can draw to the layer, you must obtain the graphics context that’s associated with the layer by calling the function CGLayerGetContext.

How does quartz cache the cglayer object?

When possible, Quartz caches a CGLayer object using a mechanism appropriate to the type of Quartz graphics context it is associated with.

Which is better layers or views in calayer?

Layers are lightweight: Layers are lighter weight than views, and therefore help you achieve better performance. They have tons of useful properties: You’ll explore some of them in the following examples. Now, you’re ready to get started by using CALayer to create some custom views.

What is calayer and how does it work?

What a CALayer is and how it works. How to use CALayer functionality to achieve cool effects like shapes, gradients and even particle systems. CALayer has more than a few properties and methods to tinker with. It has several subclasses with unique properties and methods.