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Why does ChPaint(..,img,...) have different behaviour with DRAW / PAINTER [message #41192]

Sun, 10 November 2013 19:13

Didier
Messages: 697
Registered: November 2008
Location: France

Contributor

Hi all,

I have a problem, I am trying to draw some nice borders around text
and for this I thought using ChPaint() was a good idea ==> I benefit from the hotspots.

This works perfectly when the drawing uses DRAW.
But when I use PAINTER, the result is quite ugly.

It seems that the image processing (at least processing of the alpha value) is different with DRAW and PAINTER

In the example image showing the problem :
* "---M3---" : uses DRAW ==> looks is perfect
* " 2 " : uses PAINTER ==> alpha value seems to be summed with background color ==> leads to 'INVERSE VIDEO' like

Does someone have an idea why ?
Is their a restriction to use ChPaint() with PAINTER ??

index.php?t=getfile&id=4341&private=0

Attachment: GraphCtrls.png
(Size: 3.32KB, Downloaded 806 times)

[Updated on: Sun, 10 November 2013 19:18]

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Re: Why does ChPaint(..,img,...) have different behaviour with DRAW / PAINTER [message #41290 is a reply to message #41192]

Mon, 25 November 2013 19:52

mirek
Messages: 14164
Registered: November 2005

Ultimate Member

Didier wrote on Sun, 10 November 2013 13:13

Does someone have an idea why ?
Is their a restriction to use ChPaint() with PAINTER ??

No that I know about. It looks weird (and interesting). Hard to say without a code...

Mirek

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Re: Why does ChPaint(..,img,...) have different behaviour with DRAW / PAINTER [message #41293 is a reply to message #41290]

Mon, 25 November 2013 20:20

Didier
Messages: 697
Registered: November 2008
Location: France

Contributor

Hi Mirek,

I will try to upload an example, but I won't have time to do it until next week.

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Re: Why does ChPaint(..,img,...) have different behaviour with DRAW / PAINTER [message #41501 is a reply to message #41293]

Mon, 23 December 2013 10:12

Didier
Messages: 697
Registered: November 2008
Location: France

Contributor

Hi Mirek,

I created a new topic because my first problem was only du to a missing Premultiply() and is now solved but there still is a problem with using SUBPIXEL
http://www.ultimatepp.org/forum/index.php?t=msg&goto=414 62&#msg_41462

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