//
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// imageCompressHelper.m
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// zxptUser
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//
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// Created by wujunyang on 16/4/14.
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// Copyright © 2016年 qijia. All rights reserved.
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//
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#import "imageCompressHelper.h"
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@implementation imageCompressHelper
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+(UIImage*)compressedImageToLimitSizeOfKB:(CGFloat)kb image:(UIImage*)image
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{
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//大于多少kb的图片需要压缩
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long imagePixel = CGImageGetWidth(image.CGImage)*CGImageGetHeight(image.CGImage);
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long imageKB = imagePixel * CGImageGetBitsPerPixel(image.CGImage) / (8 * 1024);
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if (imageKB > kb){
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float compressedParam = kb / imageKB;
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return [UIImage imageWithData:UIImageJPEGRepresentation(image, compressedParam)];
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}
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//返回原图
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else{
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return image;
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}
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}
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+(NSData*)returnDataCompressedImageToLimitSizeOfKB:(CGFloat)kb image:(UIImage*)image
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{
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//大于多少kb的图片需要压缩
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long imagePixel = CGImageGetWidth(image.CGImage)*CGImageGetHeight(image.CGImage);
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long imageKB = imagePixel * CGImageGetBitsPerPixel(image.CGImage) / (8 * 1024);
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if (imageKB > kb){
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float compressedParam = kb / imageKB;
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return UIImageJPEGRepresentation(image, compressedParam);
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}
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//返回原图
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else{
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return UIImageJPEGRepresentation(image, 1);
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}
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}
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+(UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset
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{
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//UIGraphicsBeginImageContext(image.size);
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//解决失真 模糊的问题
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UIGraphicsBeginImageContextWithOptions(image.size, NO, [[UIScreen mainScreen] scale]);
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CGContextRef context =UIGraphicsGetCurrentContext();
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//圆的边框宽度为2，颜色为红色
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CGContextSetLineWidth(context,2);
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CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
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CGRect rect = CGRectMake(inset, inset, image.size.width - inset *2.0f, image.size.height - inset *2.0f);
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CGContextAddEllipseInRect(context, rect);
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CGContextClip(context);
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//在圆区域内画出image原图
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[image drawInRect:rect];
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CGContextAddEllipseInRect(context, rect);
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CGContextStrokePath(context);
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//生成新的image
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UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return newimg;
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}
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+(UIImage *) imageCompressForWidth:(UIImage *)sourceImage targetWidth:(CGFloat)defineWidth
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{
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UIImage *newImage = nil;
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CGSize imageSize = sourceImage.size;
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CGFloat width = imageSize.width;
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CGFloat height = imageSize.height;
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CGFloat targetWidth = defineWidth;
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CGFloat targetHeight = height / (width / targetWidth);
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CGSize size = CGSizeMake(targetWidth, targetHeight);
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CGFloat scaleFactor = 0.0;
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CGFloat scaledWidth = targetWidth;
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CGFloat scaledHeight = targetHeight;
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CGPoint thumbnailPoint = CGPointMake(0.0, 0.0);
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if(CGSizeEqualToSize(imageSize, size) == NO){
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CGFloat widthFactor = targetWidth / width;
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CGFloat heightFactor = targetHeight / height;
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if(widthFactor > heightFactor){
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scaleFactor = widthFactor;
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}
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else{
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scaleFactor = heightFactor;
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}
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scaledWidth = width * scaleFactor;
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scaledHeight = height * scaleFactor;
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if(widthFactor > heightFactor){
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thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
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}else if(widthFactor < heightFactor){
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thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
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}
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}
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UIGraphicsBeginImageContext(size);
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CGRect thumbnailRect = CGRectZero;
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thumbnailRect.origin = thumbnailPoint;
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thumbnailRect.size.width = scaledWidth;
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thumbnailRect.size.height = scaledHeight;
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[sourceImage drawInRect:thumbnailRect];
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newImage = UIGraphicsGetImageFromCurrentImageContext();
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if(newImage == nil){
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NSLog(@"scale image fail");
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}
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UIGraphicsEndImageContext();
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return newImage;
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}
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+(UIImage *)compressImage:(UIImage *)sourceImage toTargetWidth:(CGFloat)targetWidth
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{
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CGSize imageSize = sourceImage.size;
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CGFloat width = imageSize.width;
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CGFloat height = imageSize.height;
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CGFloat targetHeight = (targetWidth / width) * height;
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UIGraphicsBeginImageContext(CGSizeMake(targetWidth, targetHeight));
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[sourceImage drawInRect:CGRectMake(0, 0, targetWidth, targetHeight)];
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UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return newImage;
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}
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+ (UIImage *)fullScreenImageALAsset:(ALAsset *)asset{
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ALAssetRepresentation *assetRep = [asset defaultRepresentation];
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CGImageRef imgRef = [assetRep fullScreenImage];//fullScreenImage已经调整过方向了
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UIImage *img = [UIImage imageWithCGImage:imgRef];
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return img;
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}
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@end
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