/*

File: QuartzUtils.h

Abstract: Assorted CoreGraphics / Core Animation utility functions.

Version: 1.0

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*/

#import <Quartz/Quartz.h>

/** Constants for various commonly used colors. */

extern CGColorRef kBlackColor, kWhiteColor, 

                  kTranslucentGrayColor, kTranslucentLightGrayColor, 

                  kAlmostInvisibleWhiteColor,

                  kHighlightColor;

/** Moves a layer from one superlayer to another, without changing its position onscreen. */

void ChangeSuperlayer( CALayer *layer, CALayer *newSuperlayer, int index );

/** Removes a layer from its superlayer without any fade-out animation. */

void RemoveImmediately( CALayer *layer );

/** Convenience for creating a CATextLayer. */

CATextLayer* AddTextLayer( CALayer *superlayer,

                           NSString *text, NSFont* font,

                           enum CAAutoresizingMask align );

/** Loads an image or pattern file into a CGImage or CGPattern.

    If the name begins with "/", it's interpreted as an absolute filesystem path.

    Otherwise, it's the name of a resource that's looked up in the app bundle.

    The image must exist, or an assertion-failure exception will be raised!

    Loaded images/patterns are cached in memory, so subsequent calls with the same name

    are very fast. */

CGImageRef GetCGImageNamed( NSString *name );

CGColorRef GetCGPatternNamed( NSString *name );

/** Loads image data from the pasteboard into a CGImage. */

CGImageRef GetCGImageFromPasteboard( NSPasteboard *pb );

/** Creates a CGPattern from a CGImage. */

CGPatternRef CreateImagePattern( CGImageRef image );

/** Creates a CGColor that draws the given CGImage as a pattern. */

CGColorRef CreatePatternColor( CGImageRef image );

/** Returns the alpha value of a single pixel in a CGImage, scaled to a particular size. */

float GetPixelAlpha( CGImageRef image, CGSize imageSize, CGPoint pt );

/** Returns the center point of a CGRect. */

static inline CGPoint GetCGRectCenter( CGRect rect ) {

    return CGPointMake(CGRectGetMidX(rect),CGRectGetMidY(rect));

}