//
//  IJSVGPatternLayer.m
//  IJSVGExample
//
//  Created by Curtis Hard on 07/01/2017.
//  Copyright © 2017 Curtis Hard. All rights reserved.
//

#import "IJSVGPatternLayer.h"

@implementation IJSVGPatternLayer

@synthesize pattern;
@synthesize patternNode;

- (void)dealloc
{
    (void)([pattern release]), pattern = nil;
    (void)([patternNode release]), patternNode = nil;
    [super dealloc];
}

- (id)init
{
    if ((self = [super init]) != nil) {
        self.requiresBackingScaleHelp = YES;
        self.shouldRasterize = YES;
    }
    return self;
}

void IJSVGPatternDrawingCallBack(void* info, CGContextRef ctx)
{
    // reassign the layer
    IJSVGPatternLayer* layer = (IJSVGPatternLayer*)info;
    [layer.pattern renderInContext:ctx];
};

- (void)drawInContext:(CGContextRef)ctx
{
    // holder for callback
    static const CGPatternCallbacks callbacks = { 0, &IJSVGPatternDrawingCallBack, NULL };

    // create base pattern space
    CGColorSpaceRef patternSpace = CGColorSpaceCreatePattern(NULL);
    CGContextSetFillColorSpace(ctx, patternSpace);
    CGColorSpaceRelease(patternSpace);

    // create the pattern
    CGRect rect = self.bounds;
    CGPatternRef ref = CGPatternCreate((void*)self, self.bounds,
        CGAffineTransformIdentity,
        roundf(rect.size.width * self.patternNode.width.value),
        roundf(rect.size.height * self.patternNode.height.value),
        kCGPatternTilingConstantSpacing,
        true, &callbacks);

    // set the pattern then release it
    CGFloat alpha = 1.f;
    CGContextSetFillPattern(ctx, ref, &alpha);
    CGPatternRelease(ref);

    // fill it
    CGContextFillRect(ctx, rect);
}

@end