#import "CPTImage.h"

@implementation CPTImage(CPTPlatformSpecificImageExtensions)

#pragma mark -

#pragma mark Init/Dealloc

/** @brief Initializes a CPTImage instance with the provided platform-native image.

*

* @param anImage The platform-native image.

* @return A CPTImage instance initialized with the provided image.

**/

-(instancetype)initWithNativeImage:(CPTNativeImage *)anImage

{

if ( (self = [self init]) ) {

self.nativeImage = anImage;

}

return self;

}

/** @brief Initializes a CPTImage instance with the contents of a PNG file.

*

* On systems that support hi-dpi or @quote{Retina} displays, this method will look for a

* double-resolution image with the given name followed by @quote{@2x}. If the @quote{@2x} image

* is not available, the named image file will be loaded.

*

* @param path The file system path of the file.

* @return A CPTImage instance initialized with the contents of the PNG file.

**/

-(instancetype)initForPNGFile:(NSString *)path

{

CGFloat imageScale = CPTFloat(1.0);

// Try to load @2x file if the system supports hi-dpi display

NSImage *newNativeImage = [[NSImage alloc] init];

NSImageRep *imageRep = nil;

for ( NSScreen *screen in [NSScreen screens] ) {

imageScale = MAX(imageScale, screen.backingScaleFactor);

}

while ( imageScale > CPTFloat(1.0) ) {

NSMutableString *hiDpiPath = [path mutableCopy];

NSUInteger replaceCount = [hiDpiPath replaceOccurrencesOfString:@".png"

withString:[NSString stringWithFormat:@"@%dx.png", (int)imageScale]

options:NSCaseInsensitiveSearch | NSBackwardsSearch | NSAnchoredSearch

range:NSMakeRange(hiDpiPath.length - 4, 4)];

if ( replaceCount == 1 ) {

imageRep = [NSImageRep imageRepWithContentsOfFile:hiDpiPath];

if ( imageRep ) {

[newNativeImage addRepresentation:imageRep];

}

}

imageScale -= CPTFloat(1.0);

}

imageRep = [NSImageRep imageRepWithContentsOfFile:path];

if ( imageRep ) {

[newNativeImage addRepresentation:imageRep];

}

return [self initWithNativeImage:newNativeImage];

}

@end