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List:       kde-kimageshop
Subject:    Re: Yet another bug. This time filters vs selections
From:       Dmitry Kazakov <dimula73 () gmail ! com>
Date:       2009-09-14 9:16:15
Message-ID: ae32c1ef0909140216s296672bbo9276780c9720f077 () mail ! gmail ! com
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>
>
> On Sunday 13 September 2009, Dmitry Kazakov wrote:
>> > Btw, Blur filter doen NOT pay any attention to selections. And i do not
>> > know the way how can it do that. =(
>> it's probably just a matter to give the iterrators the selection object.
>>
>
> It won't solve the problem of semi-selected pixels (pixels with alpha~128).
> Such pixels should be filtered with cs->applyAlphaU8Mask() separately. I
> think it'll be quite complex solution for blur filter.
>
>
> Atm, i insist on using bitBlt after the filtering. This will make filter
> creation much simplier, especially for filters that are quite complex
> themselves (like convolution). My tests show the following overhead:
>
> when 28% of the canvas is deselected we get only 2% overhead
> when 53% of the canvas is deselected we get only 13% overhead
>

when 73% of the canvas is deselected we get only 19% overhead

-- 
Dmitry Kazakov

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<div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px \
solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div \
class="gmail_quote"><div><div class="h5"><br><blockquote class="gmail_quote" \
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; \
padding-left: 1ex;">

<div style="font-family: &#39;DejaVu Sans&#39;; font-size: 9pt; font-weight: 400; \
font-style: normal;"><div>On Sunday 13 September 2009, Dmitry Kazakov \
wrote:<br></div><div> &gt; Btw, Blur filter doen NOT pay any attention to selections. \
And i do not<br> &gt; know the way how can it do that. =(<br></div>
it&#39;s probably just a matter to give the iterrators the selection \
object.<br></div></blockquote></div></div><div><br>It won&#39;t solve the problem of \
semi-selected pixels (pixels with alpha~128). Such pixels should be filtered with \
cs-&gt;applyAlphaU8Mask() separately. I think it&#39;ll be quite complex solution for \
blur filter.<br>

<br><br>Atm, i insist on using bitBlt after the filtering. This will make filter \
creation much simplier, especially for filters that are quite complex themselves \
(like convolution). My tests show the following overhead:<br>

<br>when 28% of the canvas is  deselected we get only 2% overhead<br>when 53% of the \
canvas is  deselected we get only 13% \
overhead<br></div></div></blockquote><br></div>when 73% of the canvas is  deselected \
we get only 19% overhead<br clear="all"> <br>-- <br>Dmitry Kazakov<br>



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