CoreImage - Render a CIImage to an Intermediate CVPixelBuffer Backed Image

README.md

#CoreImage - Render a CIImage to an Intermediate CVPixelBuffer Backed Image

This is useful if you're previewing several core image effects on the same image.

CIContext+IntermediateImage.m

@implementation CIContext (IntermediateImage)

- (CIImage *)rsq_renderToIntermediateImage:(CIImage *)image {
    CIImage *intermediateImage = nil;
    CGSize size = image.extent.size;
    CVPixelBufferRef pixelBuffer = NULL;
    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault,
                                          size.width,
                                          size.height,
                                          kCVPixelFormatType_32ARGB,
                                          (__bridge CFDictionaryRef) @{(__bridge NSString *) kCVPixelBufferIOSurfacePropertiesKey: @{}},
                                          &pixelBuffer);
    
    if (status == kCVReturnSuccess) {
        [self render:image toCVPixelBuffer:pixelBuffer];
        intermediateImage = [CIImage imageWithCVPixelBuffer:pixelBuffer];
    }
    
    CVPixelBufferRelease(pixelBuffer);
    return intermediateImage;
}

@end