封装CIImage实现实时渲染

#pragma mark - 可读写属性 @property (nonatomic, strong, readwrite) CIImage *inputCIImage; // 输入CIImage @property (nonatomic, strong, readwrite) NSString *filterName; // 滤镜名字
#pragma mark - 重写了getter方法,注意 @property (nonatomic, strong, readonly) CIImage *outputCIImage; // 输出CIImage @property (nonatomic, assign, readonly) BOOL filterNameValid; // 滤镜名合法性
- (instancetype)initWithFilterName:(NSString *)filterName; - (instancetype)initWithFilterName:(NSString *)filterName inputCIImage:(CIImage *)inputCIImage;
@synthesize outputCIImage = _outputCIImage; @synthesize filterNameValid = _filterNameValid; + (void)initialize if (self == [ImageFilter class]) filterNameArray = [CIFilter filterNamesInCategory:kCICategoryBuiltIn];; - (instancetype)init return [self initWithFilterName:nil inputCIImage:nil]; - (instancetype)initWithFilterName:(NSString *)filterName return [self initWithFilterName:filterName inputCIImage:nil]; - (instancetype)initWithFilterName:(NSString *)filterName inputCIImage:(CIImage *)inputCIImage self = [super init]; if (self) self.filterName = filterName; self.inputCIImage = inputCIImage; return self; -(CIImage *)outputCIImage if (_filter) return [_filter outputImage]; else return nil; - (void)configFilter:(ImageFilterConfigBlock_t)block if (_filterName _inputCIImage) // 创建滤镜 _filter = [CIFilter filterWithName:_filterName keysAndValues:kCIInputImageKey, _inputCIImage, nil]; // 设置滤镜 block(_filter); block(nil); - (BOOL)filterNameValid BOOL flag = NO; if (_filterName) for (NSString *name in filterNameArray) if ([_filterName isEqualToString:name] == YES) flag = YES; break; return flag; @end
ImageRender.h + ImageRender.m

//

// ImageRender.h

// CoreImageWapper

// Copyright (c) 2014年 Y.X. All rights reserved.

#import Foundation/Foundation.h 

#import "ImageFilter.h"

@interface ImageRender : NSObject


@property (nonatomic, strong) ImageFilter *imageFilter;

@property (nonatomic, strong) UIImage *outputImage;


 CGImageRef cgImage = [_context createCGImage:outputCIImage

 fromRect:[outputCIImage extent]];

 self.outputImage = [UIImage imageWithCGImage:cgImage];

 CGImageRelease(cgImage);

 return self.outputImage;

@end

现在,你可以这么使用了:)

好吧,来一个复杂的看看,即时渲染:

- (void)viewDidLoad

 [super viewDidLoad];

 ImageFilter *filter = [ImageFilter new];

 ImageRender *render = [ImageRender new];

 filter.filterName = @"CIPixellate";

 filter.inputCIImage = CIImageFromImage([UIImage imageNamed:@"demo"]);

 [filter configFilter:^(CIFilter *filter) {

 [filter setValue:@1

 forKey:@"inputScale"];

 render.imageFilter = filter;

 UIImageView *imageView = [[UIImageView alloc] initWithImage:[render render]];

 [self.view addSubview:imageView];

 imageView.center = self.view.center;

 _timer = [[GCDTimer alloc] initInQueue:[GCDQueue globalQueue]];

 [_timer event:^{

 static int i = 1;

 [filter configFilter:^(CIFilter *filter) {

 [filter setValue:[NSNumber numberWithInt:(i++)%10 + 1]

 forKey:@"inputScale"];

 render.imageFilter = filter;

 [[GCDQueue mainQueue] execute:^{

 imageView.image = [render render];

 } timeInterval:NSEC_PER_SEC/10.f];

 [_timer start];

}

- (void)viewDidLoad

 [super viewDidLoad];

 ImageFilter *filter = [ImageFilter new];

 ImageRender *render = [ImageRender new];

 filter.filterName = @"CIHueAdjust";

 filter.inputCIImage = CIImageFromImage([UIImage imageNamed:@"demo"]);

 [filter configFilter:^(CIFilter *filter) {

 [filter setValue:@(3.14f)

 forKey:@"inputAngle"];

 render.imageFilter = filter;

 UIImageView *imageView = [[UIImageView alloc] initWithImage:[render render]];

 [self.view addSubview:imageView];

 imageView.center = self.view.center;

 _timer = [[GCDTimer alloc] initInQueue:[GCDQueue globalQueue]];

 [_timer event:^{

 static int i = 0;

 [filter configFilter:^(CIFilter *filter) {

 [filter setValue:[NSNumber numberWithFloat:(i+=1)%314/100.f]

 forKey:@"inputAngle"];

 render.imageFilter = filter;

 [[GCDQueue mainQueue] execute:^{

 imageView.image = [render render];

 } timeInterval:NSEC_PER_SEC/60.f];

 [_timer start];

}

附录:

https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CoreImageFilterReference/Reference/reference.html#//apple_ref/doc/uid/TP40004346

https://developer.apple.com/library/mac/documentation/graphicsimaging/reference/CoreImageFilterReference/Reference/reference.html

https://developer.apple.com/library/ios/documentation/GraphicsImaging/Conceptual/CoreImaging/CoreImage.pdf

http://www.rapidsnail.com/Tutorial/t/2012/112/30/22766/the-coreimage-ios.aspx

http://www.raywenderlich.com/zh-hans/24773/%E5%88%9D%E5%AD%A6ios6-%E4%B8%AD%E7%9A%84core-image%E6%8A%80%E6%9C%AF

http://my.safaribooksonline.com/book/video/9780321637031/chapter-15dot-secret-patches-core-image-filters-and-glsl-pushing-the-boundaries/ch15sec1lev5

http://stackoverflow.com/questions/17041669/creating-a-blurring-overlay-view/17041983#17041983

 

 

 

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