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Apply a CIFilter background filter when the host window is transparent

I want to replicate the background of the dock stacks in grid and list mode. Background - translucent black with blur effect:

An example of a dock stack in grid mode http://www.thecustommac.com/wp-content/uploads/2009/09/stack-highlight.jpg

The problem is that [CALayer backgroundFilters] applies only to content in a window, filters do not apply to content in other windows. Here is my code:

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification 
{
    //make window transparent
    self.window.backgroundColor = [NSColor clearColor];
    [self.window setOpaque:NO];
    [self.window setHasShadow:NO];
    [self.window setStyleMask:NSBorderlessWindowMask];


    //make the content view layer hosting
    CALayer *rootLayer = [CALayer layer];
    [[self.window contentView] setLayer:rootLayer];
    [[self.window contentView] setWantsLayer:YES];


    //blur the background contents - NOT WORKING!
    [rootLayer setBackgroundColor:CGColorCreateGenericGray(0.0, .716)];

    CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
    [blurFilter setDefaults];
    [rootLayer setBackgroundFilters:[NSArray arrayWithObject: blurFilter]];
}

I can’t figure out how else to achieve this effect. (I looked at Display Services to see if there are any useful features, but I don't see them.)

Any ideas?

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4 answers

API. :

10.5 , 'CGSAddWindowFilter'.

typedef void * CGSConnectionID;

extern OSStatus CGSNewConnection(const void **attr, CGSConnectionID *id);

- (void)enableBlurForWindow:(NSWindow *)window
{

CGSConnectionID _myConnection;
uint32_t __compositingFilter;

int __compositingType = 1; // Apply filter to contents underneath the window, then draw window normally on top

/* Make a new connection to CoreGraphics, alternatively you could use the main connection*/

CGSNewConnection(NULL , &_myConnection);

/* The following creates a new CoreImage filter, then sets its options with a dictionary of values*/

CGSNewCIFilterByName (_myConnection, (CFStringRef)@"CIGaussianBlur", &__compositingFilter);
NSDictionary *optionsDict = [NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:3.0] forKey:@"inputRadius"];
CGSSetCIFilterValuesFromDictionary(_myConnection, __compositingFilter, (CFDictionaryRef)optionsDict);

/* Now just switch on the filter for the window */

CGSAddWindowFilter(_myConnection, [window windowNumber], __compositingFilter, __compositingType );
}
+9

, :

typedef void * CGSConnection;
extern OSStatus CGSNewConnection(const void **attributes, CGSConnection * id);

-(void)enableBlurForWindow:(NSWindow *)window {

    CGSConnection thisConnection;
    NSUInteger compositingFilter;
    NSInteger compositingType = 1 << 0;

    // Make a new connection to Core Graphics
    CGSNewConnection(NULL, &thisConnection);

    // Create a Core Image filter and set it up
    CGSNewCIFilterByName(thisConnection, (CFStringRef)@"CIGaussianBlur", &compositingFilter);
    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:2] forKey:@"inputRadius"];
    CGSSetCIFilterValuesFromDictionary(thisConnection, compositingFilter, (__bridge CFDictionaryRef)options);

    // Apply the filter to the window
    CGSAddWindowFilter(thisConnection, [window windowNumber], compositingFilter, compositingType);
}

:

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    [_window setOpaque:NO];

    [_window setBackgroundColor: [NSColor colorWithCalibratedHue:0.568 saturation:0.388 brightness:0.941 alpha:0.6]];

    [self enableBlurForWindow:_window];
}
+1

Filters are not used by the root layer: From documents:

    /* An array of filters that are applied to the background of the layer.
 * The root layer ignores this property. Animatable. */

@property(copy) NSArray *backgroundFilters;
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https://github.com/dsns/GaussianBlur_NSWindow_os_x_mavericks it looks like a crutch code for the mavericks application but it works

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