Databases
StackOverflow2013
Postsdbo
POlayer.renderInContext doesn't take layer.mask into account?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POlayer.renderInContext doesn't take layer.mask into account?
    primarykey
    data
    text
    <p>I'm trying to render some UIImages into 1 single image that I can save in my photo album. But it seems to as if the layer.renderInContext doesn't take a layermask into account?</p> <p><strong>Current behavior:</strong> the photo saves, and I see mosaicLayer, without the masking effect of maskLayer.</p> <p><strong>Expected behavior:</strong> the photo saves and I see the image in my view, with on top of that a masked mosaicLayer.</p> <p>I use the following code to mask the image</p> <pre><code>UIImage *maskImg = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"mask" ofType:@"png"]]; maskLayer = [[UIImageView alloc] initWithImage:maskImg]; maskLayer.multipleTouchEnabled = YES; maskLayer.userInteractionEnabled = YES; UIImageView *mosaicLayer = [[UIImageView alloc] initWithImage:img]; mosaicLayer.contentMode = UIViewContentModeScaleAspectFill; mosaicLayer.frame = [imageView bounds]; mosaicLayer.layer.mask = maskLayer.layer; [imageView addSubview:mosaicLayer]; </code></pre> <p>And then i use this code to save my composed image:</p> <pre><code>UIGraphicsBeginImageContext(imageView.bounds.size); [imageView.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *saver = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(saver, self, @selector(image:didFinishSavingWithError:contextInfo:), nil); </code></pre> <p><strong>EDIT</strong>: This applies the mask correctly</p> <pre><code>-(IBAction) saveImage { UIImage * saver = nil; CGImageRef image = imageView.image.CGImage; size_t cWidth = CGImageGetWidth(image); size_t cHeight = CGImageGetHeight(image); size_t bitsPerComponent = 8; size_t bytesPerRow = 4 * cWidth; //Now we build a Context with those dimensions. CGContextRef context = CGBitmapContextCreate(nil, cWidth, cHeight, bitsPerComponent, bytesPerRow, CGColorSpaceCreateDeviceRGB(), CGImageGetBitmapInfo(image)); //The location where you draw your image on the context is not always the same location you have in your UIView, //this could change and you need to calculate that position according to the scale between you images real size, and the size of the UIImage being show on the UIView. Hence the mod floats... CGContextDrawImage(context, CGRectMake(0, 0, cWidth,cHeight), image); float mod = cWidth/(imageView.frame.size.width); float modTwo = cHeight/(imageView.frame.size.height); //Make the drawing right with coordinate switch CGContextTranslateCTM(context, 0, cHeight); CGContextScaleCTM(context, 1.0, -1.0); CGContextClipToMask(context, CGRectMake(maskLayer.frame.origin.x * mod, maskLayer.frame.origin.y * modTwo, maskLayer.frame.size.width * mod,maskLayer.frame.size.height * modTwo), maskLayer.image.CGImage); //Reverse the coordinate switch CGAffineTransform ctm = CGContextGetCTM(context); ctm = CGAffineTransformInvert(ctm); CGContextConcatCTM(context, ctm); CGContextDrawImage(context, CGRectMake(0, 0, cWidth,cHeight), mosaicLayer.image.CGImage); CGImageRef mergeResult = CGBitmapContextCreateImage(context); saver = [[UIImage alloc] initWithCGImage:mergeResult]; CGContextRelease(context); CGImageRelease(mergeResult); UIImageWriteToSavedPhotosAlbum(saver, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);} </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USThomasM
    1. USThomasM
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTDuplicate
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POlayer.renderInContext doesn't take layer.mask into account?
      1. USuser339946
      1. VTFavorite
    2. VO
      singulars
      1. POlayer.renderInContext doesn't take layer.mask into account?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POlayer.renderInContext doesn't take layer.mask into account?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload