1.废话前言[可略过]

前两天和一个做IOS的朋友在一起聊天,他现在做人脸识别.他告诉我说他们公司的同事说这个图片太丑了,每次到公司看到自己的照片整个人心情都不好了,手动撸一个滤镜吧.听完朋友的话,突然想到现在好多的美颜相机什么的,竟然可以把人拍得这么好看,加上自己以前做聊天的时候也有拍照录像,可是当时没有做滤镜处理.所以我想一窥滤镜的究竟,于是有了此文

2.GPUImage集成

虽说是要做滤镜处理,可我还是没有那么丧心病狂真是全部自己写啊,我到github上找到了一个很好的滤镜框架GPUImage
地址:https://github.com/wangyansnow/GPUImage
由于使用Cocoapods的的集成方式,过于简单,github上也有,这里略过,我主要讲怎么手动集成
1.点击我的Demo地址:https://github.com/wangyansnow/WYImageFilter 下载之
2.把GPUImage整个文件夹拖到项目中
3.添加项目依赖的库

CoreMedia
CoreVideo
OpenGLES
AVFoundation
QuartzCore

4.使用的时候导入#import "GPUImage.h"

3.简单用法

#import "GPUImage.h"
#import "ViewController.h"

#define VIDEO_RECT CGRectMake(40, 64, 240, 320)

@implementation ViewController
{
    GPUImageStillCamera *_stillCamera;  /// 照相机
    GPUImageView        *_frameView;    /// 图像框
    GPUImageBeautifyFilter *_beautifyFilter; /// 美颜滤镜
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self beautifyVideo];
    
}

- (void)beautifyVideo {
    _stillCamera = [[GPUImageStillCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionFront];
    _stillCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
    
    _beautifyFilter = [GPUImageBeautifyFilter new];
    _frameView      = [[GPUImageView alloc] initWithFrame:VIDEO_RECT];
    
    [_beautifyFilter addTarget:_frameView];
    [_stillCamera addTarget:_beautifyFilter];
    
    [self.view addSubview:_frameView];
    [_stillCamera startCameraCapture];
}

- (IBAction)takePhotoBtnClick {
    [_stillCamera capturePhotoAsPNGProcessedUpToFilter:_beautifyFilter withCompletionHandler:^(NSData *processedPNG, NSError *error) {
        if (error) NSLog(@"error = %@", error);
        
        UIImage *image = [UIImage imageWithData:processedPNG];
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:VIDEO_RECT];
        imageView.image = image;
        [self.view addSubview:imageView];
        
        NSLog(@"image = %@", image);
        NSLog(@"currentThread = %@", [NSThread currentThread]);
    }];
}
@end