Performance « graphics « iPhone iPad Media Q&A

1. Performance problems on iPhone using simple graphics    stackoverflow.com

We're working on a couple simple games and we have some performance problems that we keep running into, and I was curious if it was a code issue or a "we're ...

2. iPhone Performance Differences in Quartz Drawing vs. Pre-Baked Images (which I guess simplifies to Quartz vs. Quartz)    stackoverflow.com

New to Quartz and I am curious on the drawing speeds of simple shapes, gradients, and shadows; specifically comparing Quartz drawing functions to Quartz image drawing on the iPhone. Say that I ...

3. Can I speed up my use of Core Graphics to draw moving triangles every 1/10th of a second    stackoverflow.com

I have recently added some Core Graphics elements to my app and it has slowed dramatically, rendering it just about useless. I am not sure if I am just not using ...

4. Drawing performance with CGImageCreateWithJPEGDataProvider?    stackoverflow.com

I've actually curious about this for the iPhone. I am getting an MJPEG stream from a server and trying to render it natively on the iphone (without the use of safari ...

5. Does CGDataProviderCopyData() actually copy the bytes? Or just the pointer?    stackoverflow.com

I'm running that method in quick succession as fast as I can, and the faster the better, so obviously if CGDataProviderCopyData() is actually copying the data byte-for-byte, then I think there ...

6. Rendering hundreds of "block" images -vs- Partially rendering a "map" of blocks    stackoverflow.com

It seems that none of these solutions eliminate the lag associated with rendering images onto the screen (whether from .png's or using CG). There is a 28x16 grid of blocks that are ...

7. Is CGContextAddArc really that slow (compared to a circle drawn with a few lines    stackoverflow.com

Folks, While coding up a few dials and sliders (e.g. like a big volume button one can rotate around) - I found that the standard CGContextAddArc() used like:

- (void)drawRect:(CGRect)rect {
   ...

8. Performance issue in downloading the images on iPhone from the server    stackoverflow.com

We have an application on iPhone. This application displays 25 products per page/screen. The text items such as product name, price, discount, URL of the product image, etc of all the ...

9. Processing video while capturing on iphone performance issue    stackoverflow.com

I am trying to process video frames while capturing video on an iPhone. I initially used the following code.

- (void)captureOutput:(AVCaptureOutput *)captureOutput 
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer 
   fromConnection:(AVCaptureConnection *)connection 
{   
 ...

10. CGContext Drawing Performance Optimization / Alternatives (iPhone)    stackoverflow.com

I am trying to draw quartz shapes repeatitively, but the drawing is a lot slower than acceptable. So needing some help trying to iron out some performance issues. I am seeing ...

11. Improving performance of Core Animation    stackoverflow.com

I have built a UI where the majority of what's on screen is put there using CALayer's. The layers are fairly simple in terms of their setup; the majority have an ...