cglayer_开发者

Jaggy paths when blitting an offscreen CGLayer to the current context

In my current project I need to draw a complex background as a background for a few UITableView cells. Since the code for drawing this background is pretty long and CPU heavy when executed in the cell[详细]

2023-04-12 01:29 分类：问答

How to remove UIView subviews w/out forcing a redraw?

This is somewhat of a hypothetical question, but I can imagine this situation coming up at some point in the future: Let\'s assume for a moment that I have a freakishly complicated hierarchy of UIView[详细]

2023-04-05 09:19 分类：问答

Taking snapshot of contents in CGL?

I want to create a image out of Core OpenGL context. I used following code but it creates a black image. So I guess I cannot use glReadPixles there? Any other suggestions please?[详细]

2023-03-31 17:54 分类：问答

OpenGL 3.2 context on a Carbon window (OS Lion, Mono)

I\'m trying to add modern OS X support to开发者_JAVA百科 OpenTK framework. Mac OS Lion supports OpenGL 3.2 Core context. I can successfully obtain it by using CGL. However, I can\'t find a straight wa[详细]

2023-03-27 12:15 分类：问答

iPhone: Create CGLayer with gradient point and transparent background

I would like to create a CGLayer, contains a point with gradient in boundary. Because I will use this layer to draw multiple points o开发者_运维百科n the main screen.[详细]

2023-03-26 03:15 分类：问答

iOS: How do I support Retina Display with CGLayer?

I\'m drawing a graph on a CALayer in its delegate method drawLayer:inContext:. Now I want to support Retina Display, as the graph looks blurry on the latest devices.[详细]

2023-03-21 13:01 分类：问答

iPhone - encoding and decoding a NSValue

So I read here on SO that I can encode a CGLayerRef to a NSValue using NSValue *myCopy = [[NSValue all开发者_C百科oc] initWithBytes:&myLayer objCType:@encode(CGLayerRef)];[详细]

2023-03-10 01:42 分类：问答

iPhone - pushing and pulling a value from a dictionary to a CGlayer

I have a finger painting view that I am implementing undo/redo. All the drawing occurs on a CGLayer called lineLayer.[详细]

2023-03-09 21:29 分类：问答

Issue in adding a shadow to view layer

In one of my view I am adding shadow to a view. Thing is that the shadow shows white spaces on left & right edges. I want to remove 开发者_如何学Gothese spaces.[详细]

2023-03-06 21:37 分类：问答

Best way to speed up multiple uses of "CGContextDrawRadialGradient" in drawrect?

I couldn\'t post the image, but I use the \"CGContextDrawRadialGradient\" method to draw 开发者_StackOverflowa shaded blue ball (~40 pixel diameter), it\'s shadow and to make a \"pulsing\" white ring[详细]

2023-02-15 05:42 分类：问答