Grayscale Selections

[Sven Langkamp]

On Sun, Jun 26, 2011 at 6:58 PM, Sven Langkamp <sven.langkamp at gmail.com>wrote:

> On Sun, Jun 26, 2011 at 7:27 AM, Dmitry Kazakov <dimula73 at gmail.com>wrote:
>
>>
>> I have now tried the alpha()==grayChannel() by overwriting opacityU8 as
>>>
>>> quint8 KoGrayColorSpace::opacityU8(const quint8* U8_pixel) const
>>> {
>>>     return *U8_pixel;
>>> }
>>>
>>> Interesting is that gradients works correctly, but paint doesn't respect
>>> the transparent areas of the brush.
>>>
>>
>> Does it happen when you paint on the selection? Or when you paint on a
>> regular layer with selection activated? If first, I guess, we need to take a
>> look into the compositioning of an rgb color space into this special color
>> space.
>>
>
> Regular painting works. It's definitely the rgb on grayscale without alpha.
> That doesn't take the alpha channel into account.
>

The problem is that we convert the to destination colorspace when bitBlt and
by that the alpha channel gets lost. Any suggestions how that could be
solved?
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