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POBug in CALayer's shadowPath?
 

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    <p>I'm trying to draw a custom-shaped shadow using <code>CALayer</code>:</p> <pre><code>#import &lt;QuartzCore/QuartzCore.h&gt; @implementation ZKSBAppDelegate @synthesize window = _window; - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSView *view = self.window.contentView; view.wantsLayer = YES; CALayer *shadowLayer = [CALayer layer]; shadowLayer.shadowOpacity = 1; shadowLayer.shadowRadius = 1; shadowLayer.shadowOffset = NSMakeSize(0, 0); CGMutablePathRef shadowPath = CGPathCreateMutable(); // setting the following rect's width to 100 fixes everything. // setting it to 130 screws the shadow even more. CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 120, 48)); CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48)); shadowLayer.shadowPath = shadowPath; CGPathRelease(shadowPath); [view.layer addSublayer:shadowLayer]; } @end </code></pre> <p>You can create an empty Cocoa project in Xcode, replace your app.delegate's .m file content with the above code and try it yourself.</p> <p>It looks like specific shadow path geometry causes <code>CALayer</code> to go nuts.</p> <p>For example:</p> <pre><code>CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 100, 48)); CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48)); </code></pre> <p>This one looks perfectly okay:</p> <p><img src="https://i.stack.imgur.com/I1HQa.png" alt="Okay case"></p> <p>Now I'm going to make the 1st rectangle wider by 20 points:</p> <pre><code>CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 120, 48)); CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48)); </code></pre> <p><img src="https://i.stack.imgur.com/qWrXD.png" alt="Whoa case"></p> <p>...doesn't look so good anymore. Plus 10 points:</p> <pre><code>CGPathAddRect(shadowPath, NULL, CGRectMake(4, 0, 130, 48)); CGPathAddRect(shadowPath, NULL, CGRectMake(120, 50, 116, 48)); </code></pre> <p><img src="https://i.stack.imgur.com/y0iur.png" alt="WTF case"></p> <p>Now that is plain wrong, isn't it?</p> <p>So, the question is: what the hell is going on, am I doing it wrong or something? Do you think it's a bug and I should file a report? </p>
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