CGSize TNLXSizeScale()

in TNLExample/TNLXImageSupport.m [419:456]
36 lines of code
17 McCabe index (conditional complexity)

CGSize TNLXSizeScale(CGSize sourceSize, CGSize desiredSize, UIViewContentMode contentMode)
{
    switch (contentMode) {
        case UIViewContentModeScaleToFill:
            return desiredSize;
        case UIViewContentModeScaleAspectFit:
        case UIViewContentModeScaleAspectFill:
        {
            CGFloat widthRatio = sourceSize.width / desiredSize.width;
            CGFloat heightRatio = sourceSize.height / desiredSize.height;

            if (UIViewContentModeScaleAspectFit == contentMode) {
                if (heightRatio > widthRatio) {
                    widthRatio = heightRatio;
                }
            } else {
                if (heightRatio < widthRatio) {
                    widthRatio = heightRatio;
                }
            }

            desiredSize.width = (CGFloat)floor(sourceSize.width * 2.0f / widthRatio) / 2.0f;
            desiredSize.height = (CGFloat)floor(sourceSize.height * 2.0f / widthRatio) / 2.0f;
            return desiredSize;
        }
        case UIViewContentModeRedraw:
        case UIViewContentModeCenter:
        case UIViewContentModeTop:
        case UIViewContentModeBottom:
        case UIViewContentModeLeft:
        case UIViewContentModeRight:
        case UIViewContentModeTopLeft:
        case UIViewContentModeTopRight:
        case UIViewContentModeBottomLeft:
        case UIViewContentModeBottomRight:
            return sourceSize;
    }
}