iOS - 模糊效果 - GPUImage - processImageWithCompletionHandler

Question

我使用 GPUImage 来实现模糊效果，并使我的侧边菜单背景模糊(这是 POC 代码):

UIImage *currentScreenShotImage = [Util screenshot];

GPUImageView *blurView = [[GPUImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
blurView.clipsToBounds = YES;
blurView.layer.contentsGravity = kCAGravityTop;

GPUImageiOSBlurFilter *blurFilter = [[GPUImageiOSBlurFilter alloc] init];
blurFilter.blurRadiusInPixels = 8.0f;

GPUImagePicture *picture = [[GPUImagePicture alloc] initWithImage:currentScreenShotImage];

[picture addTarget:blurFilter];
[blurFilter addTarget:blurView];

[picture processImageWithCompletionHandler:^{
    [blurFilter removeAllTargets];
}];

processImageWithCompletionHandler - 实际处理和模糊屏幕截图的方法需要 1 秒(很多!)。

我怎样才能让它更快或者有人有不同于截图的技巧？

Answer 1

如果您不需要 iOS 5 支持，您可以使用 CoreImage:https://developer.apple.com/library/mac/documentation/graphicsimaging/reference/CoreImageFilterReference/Reference/reference.html#//apple_ref/doc/filter/ci/CIGaussianBlur

代码示例:https://gist.github.com/oliland/5416438