Easy layer access for rgb8 filters.

[Boudewijn Rempt]

On Monday 17 January 2005 12:07, Casper Boemann wrote:
> On Monday 17 January 2005 10:53, Boudewijn Rempt wrote:

> > I haven't got an answer to that either, but I think that for now it's the
> > best we can do; if you for now assume that convertToQImage(0) will create
> > a QImage for you that contains the area that the users expect to be
> > filtered (whether that's currently true or not) you can continue working.
> > In the meantime, Casper can work on making that assumption true.
>
> committed
>

Of course, first we must know what the user expects about the 
area-to-be-filtered.

I haven't got Photoshop here at the moment, but I've tested with the Gimp, 
Photoshop Elements and Corel Painter. All of them do something different.

* Gimp: a layer has a definite size. If you move the layer or try to draw 
outside the layer nothing happens; the layer doesn't grow at all. You can 
even drag the complete layer outside the image.

* Elements: The size of a layer is the extent, precise to the last pixel. 
Drawing extends the layer. I have to test with filling, but that means 
another reboot.

* Painter: Layers grown with moving an painting. The size of the layer is the 
image plus the changed parts of the layer that have been moved outside the 
image. A layer always covers all of the image size.

And from memory, Photoshop acts a little different again...

Personally, I would prefer a pixel-accurate extent. Layers filled with a 
background colour start out as big as the image -- i.e., write the background 
colour to the layer making it extend as big as the image initially.

How hard would it be to keep track of the exact extent of a layer? I.e., in 
the border tiles figure out what left-most, top-most, bottom-most and 
right-most pixels are?

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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