NSImage+Additions.m #1

//
//  NSImage+Additions.m
//  Perforce
//
//  Created by Adam Czubernat on 03.06.2013.
//  Copyright (c) 2013 Perforce Software, Inc. All rights reserved.
//

#import "NSImage+Additions.h"
#import <QuickLook/QuickLook.h>

@interface PFImage : NSImage {
	
	NSMutableArray *images;
	
	NSEdgeInsets caps;
		
	BOOL threeParts;
	BOOL vertical;
	CGFloat startCap, endCap;
	
	BOOL flipped;
}
- (id)initWithImage:(NSImage *)image capInsets:(NSEdgeInsets)insets;
- (id)initWithImage:(NSImage *)image startCap:(CGFloat)start endCap:(CGFloat)end vertical:(BOOL)vertical;
@end

@implementation PFImage

- (id)initWithCoder:(NSCoder *)coder {
    if (self = [super initWithCoder:coder]) {
		images = [coder decodeObjectForKey:@"images"];
		threeParts = [[coder decodeObjectForKey:@"threeParts"] boolValue];
		vertical = [[coder decodeObjectForKey:@"vertical"] boolValue];
		flipped = [[coder decodeObjectForKey:@"flipped"] boolValue];
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)coder {
	[super encodeWithCoder:coder];
	[coder encodeObject:images forKey:@"images"];
	[coder encodeObject:@(threeParts) forKey:@"threeParts"];
	[coder encodeObject:@(vertical) forKey:@"vertical"];
	[coder encodeObject:@(flipped) forKey:@"flipped"];
}

- (id)initWithImage:(NSImage *)image capInsets:(NSEdgeInsets)insets {

	if (self = [super initWithSize:image.size]) {
		caps = insets;
		flipped = [image isFlipped];		
		NSData *data = [image TIFFRepresentation];
		CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
		CGImageRef imageRef =  CGImageSourceCreateImageAtIndex(source, 0, NULL);
				
		CGRect rect;
		CGImageRef slice;
		CGSize size = (CGSize) { CGImageGetWidth(imageRef), CGImageGetHeight(imageRef) };
		
		CGSize center = (CGSize) {
			size.width - caps.left - caps.right,
			size.height - caps.top - caps.bottom
		};
		
		images = [NSMutableArray arrayWithCapacity:9];
		
		rect = (NSRect) { 0.0f, 0.0f, caps.left, caps.top };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Topleft
		CGImageRelease(slice);

		rect = (NSRect) { caps.left, 0.0f, center.width, caps.top };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Top
		CGImageRelease(slice);
		
		rect = (NSRect) { size.width - caps.right, 0.0f, caps.right, caps.top };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Topright
		CGImageRelease(slice);
		
		rect = (NSRect) { 0.0f, caps.top, caps.left, center.height };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Left
		CGImageRelease(slice);
		
		rect = (NSRect) { caps.left, caps.top, center };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Center
		CGImageRelease(slice);
		
		rect = (NSRect) { size.width - caps.right, caps.top, caps.right, center.height };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Right
		CGImageRelease(slice);
		
		rect = (NSRect) { 0.0f, size.height - caps.bottom, caps.left, caps.bottom };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Bottomleft
		CGImageRelease(slice);
		
		rect = (NSRect) { caps.left, size.height - caps.bottom, center.width, caps.bottom };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Bottom
		CGImageRelease(slice);
		
		rect = (NSRect) { size.width - caps.right, size.height - caps.bottom, caps.right, caps.bottom };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]]; // Bottomright
		CGImageRelease(slice);
		
		CGImageRelease(imageRef);
		CFRelease(source);
	}
	return self;
}

- (id)initWithImage:(NSImage *)image startCap:(CGFloat)start endCap:(CGFloat)end vertical:(BOOL)isVertical {

	if (self = [super initWithSize:image.size]) {
		
		threeParts = YES;
		startCap = start;
		endCap = end;
		vertical = isVertical;
		
		flipped = [image isFlipped];
		NSData *data = [image TIFFRepresentation];
		CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
		CGImageRef imageRef =  CGImageSourceCreateImageAtIndex(source, 0, NULL);
		
		CGRect rect;
		CGImageRef slice;
		CGSize size = (CGSize) { CGImageGetWidth(imageRef), CGImageGetHeight(imageRef) };
				
		images = [NSMutableArray arrayWithCapacity:3];
		
		rect = (vertical ?
				(NSRect) { 0.0f, 0.0f, size.width, startCap } :
				(NSRect) { 0.0f, 0.0f, startCap, size.height });
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]];
		CGImageRelease(slice);
		
		rect = (vertical ?
				(NSRect) { 0.0f, startCap, size.width, size.height - startCap - endCap } :
				(NSRect) { startCap, 0.0f, size.width - startCap - endCap, size.height });
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]];
		CGImageRelease(slice);
		
		rect = vertical ?
		(NSRect) { 0.0f, size.width - endCap, size.width, endCap } :
		(NSRect) { size.width - endCap, 0.0f, endCap, size.height };
		slice = CGImageCreateWithImageInRect(imageRef, rect);
		[images addObject:[[NSImage alloc] initWithCGImage:slice size:rect.size]];
		CGImageRelease(slice);
		
		CGImageRelease(imageRef);
		CFRelease(source);
	}
	return self;
}

- (void)drawInRect:(NSRect)rect fromRect:(NSRect)fromRect operation:(NSCompositingOperation)op fraction:(CGFloat)delta {
	
	if (threeParts) {
		NSDrawThreePartImage(rect,
							 [images objectAtIndex:0],
							 [images objectAtIndex:1],
							 [images objectAtIndex:2],
							 vertical,
							 op, delta, flipped);
	} else {
		NSDrawNinePartImage(rect,
							[images objectAtIndex:0],
							[images objectAtIndex:1],
							[images objectAtIndex:2],
							[images objectAtIndex:3],
							[images objectAtIndex:4],
							[images objectAtIndex:5],
							[images objectAtIndex:6],
							[images objectAtIndex:7],
							[images objectAtIndex:8],
							op, delta, flipped);
	}
}

- (void)drawInRect:(NSRect)dstSpacePortionRect fromRect:(NSRect)srcSpacePortionRect operation:(NSCompositingOperation)op fraction:(CGFloat)requestedAlpha respectFlipped:(BOOL)respectContextIsFlipped hints:(NSDictionary *)hints  {
	[self drawInRect:dstSpacePortionRect fromRect:srcSpacePortionRect operation:op fraction:requestedAlpha];
}

@end

@implementation NSImage (Additions)

+ (NSImage *)imageWithFilePreview:(NSString *)filePath size:(NSSize)size icon:(BOOL)icon {
	
    NSURL *fileURL = [NSURL fileURLWithPath:filePath];
    if (!filePath || !fileURL)
        return nil;
    
	NSImage *image = nil;
	
    NSDictionary *dict = @{ (NSString *)kQLThumbnailOptionIconModeKey : @(icon) };
    CGImageRef ref = QLThumbnailImageCreate(kCFAllocatorDefault,
                                            (__bridge CFURLRef)fileURL,
                                            CGSizeMake(size.width, size.height),
                                            (__bridge CFDictionaryRef)dict);
	
	// Get icon if quicklook preview hasn't worked
    if (!ref) {
		image = [[NSWorkspace sharedWorkspace] iconForFile:filePath];
		[image setSize:size];
		return image;
	}
		
	NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc] initWithCGImage:ref];
	if (bitmap) {
		image = [[NSImage alloc] initWithSize:[bitmap size]];
		[image addRepresentation:bitmap];
	}
	
	CFRelease(ref);
    
    return image;
}

- (NSImage *)resizableImageWithCapInsets:(NSEdgeInsets)capInsets {
	return [[PFImage alloc] initWithImage:self capInsets:capInsets];
}

- (NSImage *)resizableImageWithLeftCap:(CGFloat)left rightCap:(CGFloat)right {
	return [[PFImage alloc] initWithImage:self startCap:left endCap:right vertical:NO];
}

- (NSImage *)resizableImageWithTopCap:(CGFloat)top bottomCap:(CGFloat)bottom {
	return [[PFImage alloc] initWithImage:self startCap:top endCap:bottom vertical:YES];
}

- (BOOL)isResizable {
	return [self isKindOfClass:[PFImage class]];
}

@end