CODEWITHSUNDEEP
iosgpuimage
OgreSwamp
OgreSwamp

Reputation: 4692

GPUImageiOSBlurFilter imageByFilteringImage: returns nil

spent some time and can't really understand where is a problem.

I'm using GPUImage 0.1.3 (from CocoaPods) and have very straightforward code:

GPUImageiOSBlurFilter *iosBlur = [[GPUImageiOSBlurFilter alloc] init];
UIImage *splashScreenImage = [UIImage imageNamed:@"Splash"];
UIImage *bluredImage = [iosBlur imageByFilteringImage:splashScreenImage];

bluredImage is nil. I stepped through the code, iosBlur isn't nil, splashScreenImage isn't nil and contains proper image (checked in debugger's quick view). So I don't have any idea where is a problem.

Upvotes: 2

Views: 952

Answers (2)

George Maisuradze
George Maisuradze

Reputation: 2021

From the GPUImageOutput.h

// Platform-specific image output methods
// If you're trying to use these methods, remember that you need to set -useNextFrameForImageCapture 
// before running -processImage or running video and calling any of these methods, 
// or you will get a nil image
#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
- (UIImage *)imageByFilteringImage:(UIImage *)imageToFilter;

Upvotes: 0

Shahar Hadas
Shahar Hadas

Reputation: 2827

This is how I worked around it - crude, but works. BTW - this still happens with the latest code of GPUImage, although I mostly see the issue in the simulator.

    int errorCount = 0;
    UIImage *blurImage;
    //Loop workaround for some unknown GPUImage issue where sometimes the result is nil.
    while (! (blurImage = [imageFilter imageByFilteringImage:image]) ) {
        ++errorCount;
    }

    if (errorCount > 0) {
        NSLog(@"GPUImageiOSBlurFilter imageByFilteringImage error count: %i", errorCount);
    }

Upvotes: 1

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