#import "CPTPlatformSpecificFunctions.h"

#pragma mark Graphics Context

// linked list to store saved contexts

static NSMutableArray *pushedContexts = nil;

/** @brief Pushes the current AppKit graphics context onto a stack and replaces it with the given Core Graphics context.

* @param newContext The graphics context.

**/

void CPTPushCGContext(CGContextRef newContext)

{

if ( newContext ) {

if ( !pushedContexts ) {

pushedContexts = [[NSMutableArray alloc] init];

}

[pushedContexts addObject:[NSGraphicsContext currentContext]];

[NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithGraphicsPort:newContext flipped:NO]];

}

}

/**

* @brief Pops the top context off the stack and restores it to the AppKit graphics context.

**/

void CPTPopCGContext(void)

{

if ( pushedContexts.count > 0 ) {

[NSGraphicsContext setCurrentContext:pushedContexts.lastObject];

[pushedContexts removeLastObject];

}

}

#pragma mark -

#pragma mark Context

/**

* @brief Get the default graphics context

**/

CGContextRef CPTGetCurrentContext(void)

{

return [[NSGraphicsContext currentContext] graphicsPort];

}

#pragma mark -

#pragma mark Colors

/** @brief Creates a @ref CGColorRef from an NSColor.

*

* The caller must release the returned @ref CGColorRef. Pattern colors are not supported.

*

* @param nsColor The NSColor.

* @return The @ref CGColorRef.

**/

CGColorRef CPTCreateCGColorFromNSColor(NSColor *nsColor)

{

NSColor *rgbColor = [nsColor colorUsingColorSpace:[NSColorSpace genericRGBColorSpace]];

CGFloat r, g, b, a;

[rgbColor getRed:&r green:&g blue:&b alpha:&a];

return CGColorCreateGenericRGB(r, g, b, a);

}

/** @brief Creates a CPTRGBAColor from an NSColor.

*

* Pattern colors are not supported.

*

* @param nsColor The NSColor.

* @return The CPTRGBAColor.

**/

CPTRGBAColor CPTRGBAColorFromNSColor(NSColor *nsColor)

{

CGFloat red, green, blue, alpha;

[[nsColor colorUsingColorSpaceName:NSCalibratedRGBColorSpace] getRed:&red green:&green blue:&blue alpha:&alpha];

CPTRGBAColor rgbColor;

rgbColor.red = red;

rgbColor.green = green;

rgbColor.blue = blue;

rgbColor.alpha = alpha;

return rgbColor;

}