voronoi_modified_GPUImage

modified GPUImageJFAVoronoiFilter and GPUImageVoronoiConsumerFilter for stillImage of the https://github.com/BradLarson/GPUImage thanks for GPUImage and BradLarson

0.what is changed from the original GPUImageVoronoi

i changed the GPUImageJFAVoronoiFilter.h and GPUImageJFAVoronoiFilter.m and GPUImageVoronoiConsumerFilter.m and make Voronoi filter to work with stillImage.(i did not test videoCamera). because i am a totally newer of opengl-es, i just refer to the implement of this webgl exzample which mentioned in GPUImageJFAVoronoiFilter.h http://unitzeroone.com/labs/jfavoronoi/, so please tell me if something not correct in my modified codes.

but i change the USAGE when you using the new JFA , i move the for circle of numPASSes out from GPUImageJFAVoronoiFilter.m now GPUImageJFAVoronoiFilter will output a image,then you need to use the original image and the image GPUImageJFAVoronoiFilter generated to pass them (in strict order when addTarget ) to GPUImageVoronoiConsumerFilter

1.how to use it

    //first use the 4 files to replace the corresponding files in GPUImage
    //JFAVoronoi.h
    //JFAVoronoi.m
    //Consumer.h
    //Consumer.m

    GPUImageOutput<GPUImageInput> *filter;
    GPUImagePicture *sourcePicture;
    UIImage * filteredImage;
    CGFloat temp = 0.5;
    GPUImagePicture * stillImage = [[GPUImagePicture alloc] initWithImage:[UIImage imageNamed:@"lena.jpg"]];
    GPUImageJFAVoronoiFilter * jfa = [[GPUImageJFAVoronoiFilter alloc] init];
    [jfa setSizeInPixels:CGSizeMake(1024.0, 1024.0)];
    [jfa setInitStep:temp];
    sourcePicture = [[GPUImagePicture alloc] initWithImage:[UIImage imageNamed:@"voronoi_points2.png"]];
    [sourcePicture addTarget:jfa];
    [jfa useNextFrameForImageCapture];
    [sourcePicture processImage];
    [jfa useNextFrameForImageCapture];
    filteredImage = [jfa imageFromCurrentFramebuffer];
    //numPasses = 9
    for (int j=1; j<=9; j++) {
        temp = temp / 2;
        sourcePicture = [[GPUImagePicture alloc] initWithImage:filteredImage];
        [jfa setInitStep:temp];
        [sourcePicture addTarget:jfa];
        [jfa useNextFrameForImageCapture];
        [sourcePicture processImage];
        [jfa useNextFrameForImageCapture];
        filteredImage = [jfa imageFromCurrentFramebuffer];
    }
    filter = [[GPUImageVoronoiConsumerFilter alloc] init];
   [(GPUImageVoronoiConsumerFilter *)filter setSizeInPixels:CGSizeMake(1024.0, 1024.0)];
    sourcePicture = [[GPUImagePicture alloc] initWithImage:filteredImage];
    [stillImage addTarget:filter];
    [sourcePicture addTarget:filter];
    [filter useNextFrameForImageCapture];
    [stillImage processImage];
    [sourcePicture processImage];
    filteredImage = [filter imageFromCurrentFramebuffer];
   [self.selectedImageView setImage:filteredImage];

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