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Re: Pixel-aligned autoresizing

From: Eric Wasylishen
Subject: Re: Pixel-aligned autoresizing
Date: Fri, 8 Jul 2011 15:56:59 -0600

On 2011-07-08, at 2:27 AM, Fred Kiefer wrote:

> On 08.07.2011 09:34, Eric Wasylishen wrote:
>> On 2011-07-07, at 4:19 PM, Fred Kiefer wrote:
>>> On 07.07.2011 10:16, Eric Wasylishen wrote:
>>>> On a related note, I added a test case for autoresizing to
>>>> Tests/gui/NSView/NSView_autoresize_and_rounding.m.
>>>> It looks like we have some differences from cocoa unrelated to
>>>> rounding, but related to how extra space is divided between the lower
>>>> margin, view size, and upper margin when NSViewMinXMargin or
>>>> MaxXMargin is combined with NSViewWidthSizable.
>>> I tried to fix the autoresizing behaviour and now it passes the first of 
>>> your tests. Looks like we will need to add the pixel alignment to pass the 
>>> second one :-)
>> Ok, great! I committed a slightly improved version of my rounding patch, and 
>> now both tests pass.
>> It looks like switching to the proportional autoresizing has cause a few 
>> glitches in gui; the colour pickers aren't showing up, and the font panel 
>> doesn't resize properly when stretched horizontally. Hopefully these will be 
>> easy to fix.
> Thank you for spotting this. I noticed a strange problem with the NSBox test 
> in GSTest and put in the check if options is greater than 0.0 to work around 
> that. I hadn't noticed the other ones. Most likely there is a common cause 
> (maybe related to negative coordinate?), we just need to find and fix it.
> The good thing is that your change requires that people have to recompile all 
> their libraries and applications. This should buy us time to fix the problem 
> before they notice.
I found and fixed the main problem, which was not handling cases where the sum 
of the flexible space is 0. I added some more tests for this as well, which are 
all passing now.

I think NSFontPanel will need some manual tweaking so it resizes properly, 
maybe we can change it to use a GSHBox to hold the columns.

> Back to the original topic of this thread: Do you think your alignment change 
> allows us to remove the rounding we do in the cairo backend and still get 
> nice results for the normal cases or is more adjustment in gui needed?

I think it's safe to do. I went ahead and removed most of the rounding in 
cairo. If it causes serious problems we can always revert but things look OK to 
me. Also, the PixelExactDrawing-test is now very close to Cocoa.


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