CIImage Additions Reference

Inherits from
Conforms to
Framework
/System/Library/Frameworks/AppKit.framework
Availability
Available in OS X v10.4 and later.
Declared in
NSCIImageRep.h

Overview

The Application Kit adds three methods to the Core Image framework's CIImage class.

Tasks

Initializing

Drawing Images

Instance Methods

drawAtPoint:fromRect:operation:fraction:

Draws all or part of the image at the specified point in the current coordinate system.

- (void)drawAtPoint:(NSPoint)point fromRect:(NSRect)srcRect operation:(NSCompositingOperation)op fraction:(CGFloat)delta
Parameters
point

The location in the current coordinate system at which to draw the image.

srcRect

The source rectangle specifying the portion of the image you want to draw. The coordinates of this rectangle must be specified using the image's own coordinate system.

op

The compositing operation to use when drawing the image.

delta

The opacity of the image, specified as a value from 0.0 to 1.0. Specifying a value of 0.0 draws the image as fully transparent while a value of 1.0 draws the image as fully opaque. Values greater than 1.0 are interpreted as 1.0.

Discussion

The image content is drawn at its current resolution and is not scaled unless the CTM of the current coordinate system itself contains a scaling factor. The image is otherwise positioned and oriented using the current coordinate system.

Availability
  • Available in OS X v10.4 and later.
Declared In
NSCIImageRep.h

drawInRect:fromRect:operation:fraction:

Draws all or part of the image in the specified rectangle in the current coordinate system

- (void)drawInRect:(NSRect)dstRect fromRect:(NSRect)srcRect operation:(NSCompositingOperation)op fraction:(CGFloat)delta
Parameters
dstRect

The rectangle in which to draw the image.

srcRect

The source rectangle specifying the portion of the image you want to draw. The coordinates of this rectangle must be specified using the image's own coordinate system.

op

The compositing operation to use when drawing the image.

delta

The opacity of the image, specified as a value from 0.0 to 1.0. Specifying a value of 0.0 draws the image as fully transparent while a value of 1.0 draws the image as fully opaque. Values greater than 1.0 are interpreted as 1.0.

Discussion

If the srcRect and dstRect rectangles have different sizes, the source portion of the image is scaled to fit the specified destination rectangle. The image is otherwise positioned and oriented using the current coordinate system.

Availability
  • Available in OS X v10.4 and later.
Declared In
NSCIImageRep.h

initWithBitmapImageRep:

Initializes the receiver, a newly allocated CIImage object, with the specified bitmap.

- (id)initWithBitmapImageRep:(NSBitmapImageRep *)bitmapImageRep
Parameters
bitmapImageRep

An image representation object containing the bitmap data.

Return Value

The resulting CIImage object.

Availability
  • Available in OS X v10.4 and later.
Related Sample Code
Declared In
NSCIImageRep.h