iOS/WAStickersThirdParty/YYImageCoder.m [2269:2275]:
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        if (frame.blend == YYImageBlendOver) {
            CGImageRef unblendImage = [self _newUnblendedImageAtIndex:frame.index extendToCanvas:NO decoded:NULL];
            if (unblendImage) {
                CGContextDrawImage(_blendCanvas, CGRectMake(frame.offsetX, frame.offsetY, frame.width, frame.height), unblendImage);
                CFRelease(unblendImage);
            }
            imageRef = CGBitmapContextCreateImage(_blendCanvas);
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iOS/WAStickersThirdParty/YYImageCoder.m [2288:2294]:
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        if (frame.blend == YYImageBlendOver) {
            CGImageRef unblendImage = [self _newUnblendedImageAtIndex:frame.index extendToCanvas:NO decoded:NULL];
            if (unblendImage) {
                CGContextDrawImage(_blendCanvas, CGRectMake(frame.offsetX, frame.offsetY, frame.width, frame.height), unblendImage);
                CFRelease(unblendImage);
            }
            imageRef = CGBitmapContextCreateImage(_blendCanvas);
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