Crash in [FXBlurView snapshotOfUnderlyingView] under iOS 8

[mathiasAichinger]

Hi,

I got the following crash under iOS 8 when scrolling a UITableView which is under the FXBlurView:
#4 0x03036b5e in CGPathCreateWithRect ()
#5 0x031014d9 in CGContextAddRect ()
#6 0x047fffb0 in CA_CGContextAddRoundRect ()
#7 0x04916043 in -CALayer _renderBackgroundInContext:
#8 0x049159f4 in -CALayer renderInContext:
#9 0x049174a7 in -CALayer _renderSublayersInContext:
#10 0x04915a2c in -CALayer renderInContext:
#11 0x049174a7 in -CALayer _renderSublayersInContext:
#12 0x04915a2c in -CALayer renderInContext:
#13 0x049174a7 in -CALayer _renderSublayersInContext:
#14 0x04915a2c in -CALayer renderInContext:
#15 0x049174a7 in -CALayer _renderSublayersInContext:
#16 0x04915a2c in -CALayer renderInContext:
#17 0x00b3cc13 in -[FXBlurView snapshotOfUnderlyingView]
#18 0x00b3d5b8 in -[FXBlurView updateAsynchronously:completion:]
#19 0x00b3a5e6 in -[FXBlurScheduler updateAsynchronously]
#20 0x0382b717 in __NSFireDelayedPerform ()

Log output:

�[;Assertion failed: (transform_is_valid(m)), function CGPathRef CGPathCreateWithRect(CGRect, const CGAffineTransform *), file Paths/CGPath.cc, line 179.

Currently I have no clue why this happens!

[dcacenabes]

I am getting the same error in iOS7 with a page view controller. It happens with dynamic blurring on.

[roycable]

I too am having this issue - limited to iOS 8 though.

Looks like the method -(updateAsynchronously: completion:) is being hit repeatably even though I haven't set the blur to update.

When I manually add return NO inside -(shouldUpdate), performance is back to that of iOS 7.

This is my initialisation code;

FXBlurView *_bgBlur = [[FXBlurView alloc] initWithFrame:_carouselBackground.bounds];
_bgBlur.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
_bgBlur.blurRadius = 15;
_bgBlur.tintColor = [UIColor clearColor];
[self.view addSubview:_bgBlur];

NB: I found this out by using Instruments on my application, which was showing 101% of my CPU being used causing all UI to be sluggish.

[shineall]

Is this issue is solved in 1.6.2 ? it only happen in iOS 8.

0x0000000186b88ad4 -[CALayer _renderBorderInContext:] + 296
7 QuartzCore 0x0000000186b875b4 -[CALayer renderInContext:] + 1068
8 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
9 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
10 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
11 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
12 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
13 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
14 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
15 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
16 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
17 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
18 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
19 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
20 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
21 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
22 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
23 QuartzCore 0x0000000186b8759c -[CALayer renderInContext:] + 1044
24 QuartzCore 0x0000000186b88500 -[CALayer _renderSublayersInContext:] + 400
25 QuartzCore 0x0000000186b87530 -[CALayer renderInContext:] + 936

[roycable]

I resolved this by explicitly setting _fxBlur.dynamic = NO;
ie. looks like under iOS 8 the dynamic setting is defaulted to true... which probably means if you have multiple instances of FXBlurView, you'll have a number of views updating at once (bit of a performance hit).

[shineall]

@roycable Thank you for comment. But I am using dynamic mode somewhere~ Is there another way to avoid crash this even though dynamic is on.

[dcacenabes]

Not elegant, but if you are desperate you can always try-catch around the problematic line.

[javiholcman]

Working with my partner we find the same bug. In our case, was crashing on the renderInContext of a subview of the underlyingLayer. Apparently, they introduced a bug on the renderInContext when the view contains 0 in the width. Check the subviews and it frames. Good luck.

[shineall]

@david , @javiholcman

Thanks !! If I gonna catch the solution , i gonna share~

On Fri, Oct 31, 2014 at 1:02 PM, javiholcman notifications@github.com
wrote:

Working with my partner we find the same bug. In our case, was crashing on
the renderInContext of a subview of the underlyingLayer. Apparently, they
introduced a bug on the renderInContext when the view contains 0 in the
width. Check the subviews and it frames. Good luck.

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