[Bug 54689] tint value is wrongly applied for several colors

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=54689

Sven <sv...@ipsways.com> changed:

           What    |Removed                     |Added
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                 OS|                            |All

--- Comment #1 from Sven <sv...@ipsways.com> ---
Sorry, I mixed up some colors. Here's the corrected text: 

For e.g. xlsx cell back ground color 11851260 - rgb 252/213/180 (visual basic 
used: ActiveCell.Interior.Color) the tint value is correct and also getRgb() 
delivers the correct value (byte array: [-9, -106, 70] - Hex: F79646 - theme 9) 
without tint applied. But the value with the tint applied by getRgbWithTint() 
(XSSFColor internal private method applyTint()) delivers rgb 251/212/180 (byte 
array: [-5, -44, -76]). 

Other color value to reproduce () is 14277081 - rgb 217/217/217 (theme - 0). 
getRgb() delivers the correct value (byte array: [-1, -1, -1]) but
getRgbWithTint() 
delivers byte array [0, 0, 0] even if the tint is -0.1499984740745262. 
If I apply the tint using your method from 3.9 manually I even receive 
216/216/216.

    private static byte applyTint(int lum, double tint){
        if(tint > 0){
            return (byte)(lum * (1.0-tint) + (255 - 255 * (1.0-tint)));
        } else if (tint < 0){
            return (byte)(lum*(1+tint));
        } else {
            return (byte)lum;
        }
    }

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