Hello all,
I am stuck to a problem related to core graphics. Actually i want to
display an image over a overlay nswindow. For creating an cgimageref i
have written the following code:
Code:
CGImageRef getPNGImage(CFStringRef fileName)
{
CGDataProviderRef provider;
//CFStringRef fileName = NULL;
CGImageRef image = NULL;
CFURLRef url = NULL;
CFBundleRef appBundle = CFBundleGetMainBundle();
if ( appBundle == NULL ) goto Bail;
//fileName = CFStringCreateWithCString( NULL, "originalColor.png",
kCFStringEncodingASCII ); // ToolbarPoof.png is in our Resources
directory within the bundle
if ( fileName == NULL ) goto Bail;
url = CFBundleCopyResourceURL( appBundle, fileName, NULL, NULL );
if ( url == NULL ) goto Bail;
provider = CGDataProviderCreateWithURL( url );
image = CGImageCreateWithPNGDataProvider( provider, NULL, false,
kCGRenderingIntentDefault );
CGDataProviderRelease( provider );
Bail:
if ( fileName != NULL ) CFRelease( fileName );
if ( url != NULL ) CFRelease( url );
return( image );
}
But i am not able to display the image on the overlay window.first thing
is tht i dont know how to put the image on my window still i tried by
writing following stuff:
Code:
//getting the current context.
CGContextRef myContext = [[NSGraphicsContext currentContext]
graphicsPort];
//nsstring converted to CFStringRef.
CFStringRef cfFilepath = (CFStringRef)image;
//calling the above method.
CGImageRef image = getPNGImage(cfFilepath);
//drawing the image but where it is displayed i dont know :(.
CGContextDrawImage(myContext,CGRectMake(0,0,CGImageGetWidth( image
),CGImageGetHeight( image )),image);
In my class where i am implementing this i have the following init method:
My main problem is how should i display the image over specified location
ie over the overlay window
or rather how to put the image over the window so tht it is visible.
Code:
// init method for OverlayWindow class
-(id)initWithRect:(NSRect)contentRect Controller:(OverlayController
*)overlayControl
{
//dockOrientation = @"";
if(self = [super initWithContentRect:contentRect
styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO])
{
//[self setBackgroundColor: [NSColor clearColor]];
//[self setAlphaValue:0.00];
[self setBackgroundColor:[NSColor redColor]];
[self setAlphaValue:0.5];
[self setOpaque:NO];
[self setHasShadow: NO];
[self setLevel:NSStatusWindowLevel];
[self makeKeyAndOrderFront:self];
[self setIgnoresMouseEvents:NO];
// register for required drag types
[self registerForDraggedTypes:[NSArray
arrayWithObjects:@"CorePasteboardFlavorType
0x6974756E",@"AlbumListPboardType",@"AlbumDataListPboardType",NSFilenamesPboardType,NSFilesPromisePboardType,
nil]];
//@"ImageDataListPboardType",
//[trackingWin registerForDraggedTypes:[NSArray
arrayWithObjects:@"CorePasteboardFlavorType
0x6974756E",@"AlbumListPboardType",@"AlbumDataListPboardType",NSFilenamesPboardType,NSFilesPromisePboardType,
nil]];
//[self setAcceptsMouseMovedEvents:YES];
//highlightImage = [NSImage
imageNamed:@"Connect_highlight"];
isFocused = NO;
//isDragEntered = NO;
NSScreen *mainScreen = [NSScreen mainScreen];
screenRect = [mainScreen frame];
//[self showWindow:YES];
overlayController = overlayControl;
gOverlayWindow = self;
return self;
}
return nil;
}
Regards...
@mit
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