(I already read this page, but it didn't help me CALayer not displaying)
I have a class called Image that has this field data:
uint8_t *data;
I already use this data to display this Image on a CALayer that I got gathering code from the internet.
I saw how to create another windows in my application, and I put a NSView inside it to display an Image using the method, I intend to display the histogram latter, but now I'm just trying to display again the same image:
-(void)wrapImageToCALayer: (CALayer*) layer{
if(!layer) return;
CGColorSpaceRef grayColorSpace = CGColorSpaceCreateDeviceGray();
CGContextRef context = CGBitmapContextCreate(data, width, height, 8, step, grayColorSpace, kCGImageAlphaNone);
CGImageRef dstImage = CGBitmapContextCreateImage(context);
dispatch_sync(dispatch_get_main_queue(), ^{
layer.contents = (__bridge id)dstImage;
});
CGImageRelease(dstImage);
CGContextRelease(context);
CGColorSpaceRelease(grayColorSpace);
}
And this is my Window Controler:
@implementation HistogramControllerWindowController
@synthesize display;
- (id)initWithWindow:(NSWindow *)window{
self = [super initWithWindow:window];
if (self) {
// Initialization code here.
}
return self;
}
- (void)windowDidLoad
{
// Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
[super windowDidLoad];
histogramDisplayLayer = [CALayer layer];
[histogramDisplayLayer setContentsGravity:AVLayerVideoGravityResizeAspectFill];
histogramDisplayLayer.position = CGPointMake(display.frame.size.width/2., display.frame.size.height/2.);
[histogramDisplayLayer setNeedsDisplay];
[display.layer addSublayer: histogramDisplayLayer];
}
@end
And I'm calling this way:
[frame wrapImageToCALayer:histogramDisplayLayer];
Note that histogramDisplayLayer is an external (CALayer *)
Just insert:
[display setWantsLayer:YES]; // view's backing store is using a Core Animation Layer
Before:
[display.layer addSublayer: histogramDisplayLayer];