CODEWITHSUNDEEP
iosswiftdrawimageglkvieweaglcontext
Chris
Chris

Reputation: 1405

drawImage() different on iPad and iPhone?

I have a glView which is 51x51px like this. 

...
glContext = EAGLContext(API: .OpenGLES2)
glView = GLKView()
glView.context = glContext
ciContext = CIContext(EAGLContext: glContext)
glView.layer.borderColor = UIColor.redColor().CGColor
glView.layer.borderWidth = 3
glView.translatesAutoresizingMaskIntoConstraints = false

widthConstraint = NSLayoutConstraint(item: glView, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 51)
loupeImageView.addConstraint(widthConstraint)
heightConstraint = NSLayoutConstraint(item: glView, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 51)
loupeImageView.addConstraint(heightConstraint)
...

Later I am drawing the center portion of image (received from an AVpreviewlayer) into the glView's EAGL-context like this:

ciContext.drawImage(image, inRect: CGRectMake(0, 0, 50, 50), 
  fromRect: CGRect(x: (image.extent.width/2)-(50/2), y: (image.extent.height / 2)-(50/2), width: source, height: source))
glView.display()

Basically the code works but the exactly same code behaves different on iPad and iPhone5. The results are shown below. The red-borderd rectangle is the glView.

glView on iPhone

glView on iPad

On iPhone the black part (which is the image I am drawing) inside the red rectangle should completely fill the rectangle such as on iPad... not just the bottom left quarter.

Does anybody have an idea what the problem is here ?

Regards Chris

ps.I am on iOS 9.2.1 on both devices

Upvotes: 1

Views: 85

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