//
//  UIImage+Extender.m
//  FashionApp
//
//  Created by 1 on 2018/5/24.
//  Copyright © 2018年 1. All rights reserved.
//

#import "UIImage+Extender.h"

@implementation UIImage (Extender)
+ (UIImage *)imageWithColor:(UIColor*)color size:(CGSize)size
{
    CGRect rect =CGRectMake(0,0, size.width, size.height);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context =UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image =UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}
+ (UIImage *)createViewImage:(UIView *)shareView
{
    UIGraphicsBeginImageContextWithOptions(shareView.bounds.size, NO, [UIScreen mainScreen].scale);
    CGContextRef contextRef = UIGraphicsGetCurrentContext();
    CGContextSetRGBFillColor(contextRef, 0.0, 0.0, 0.0, 0.0);
    
    [shareView.layer renderInContext:contextRef];
    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

// 二维码图片增加清晰度
+ (UIImage *)createUIImageFormCIImage:(CIImage *)image withSize:(CGSize)size {
    
    CGRect extent = CGRectIntegral(image.extent);
    CGFloat scale = MIN(size.width/CGRectGetWidth(extent), size.height/CGRectGetHeight(extent));
    
    // 1.创建bitmap;
    size_t width = CGRectGetWidth(extent) * scale;
    size_t height = CGRectGetHeight(extent) * scale;
    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
    CIContext *context = [CIContext contextWithOptions:nil];
    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
    CGContextScaleCTM(bitmapRef, scale, scale);
    CGContextDrawImage(bitmapRef, extent, bitmapImage);
    
    // 2.保存bitmap到图片
    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
    CGContextRelease(bitmapRef);
    CGImageRelease(bitmapImage);
    CGColorSpaceRelease(cs);
    
    UIImage *qrcodeImage = [UIImage imageWithCGImage:scaledImage];
    
    CGImageRelease(scaledImage);
    
    return qrcodeImage;
}
@end