cstester - a tool for testing loading and painting of documents

[Elvis Stansvik]

2011/1/19 Inge Wallin <inge at lysator.liu.se>:
> On Wednesday, January 19, 2011 05:46:04 Thorsten Zachmann wrote:
>> On Tuesday, January 18, 2011 14:24:38 Inge Wallin wrote:
>> > For Words, how about adding a dump of the text layout and compare
>> > that?  That  should be easier (and faster!) than generating and comparing
>> > bitmaps. The bitmaps themselves would also not give much added
>> > information, especially if the goal is to find faulty layouts which seems
>> > to be the biggest problem right now except for crashes.
>>
>> You see that as an additional feature or as replacement for the image based
>> one.
>> I relay like to keep the imaged based one as it also tests the code called
>> during painting and that is quite different from the internal
>> representation.
>
> My original reason for suggesting this is because I think that the image based
> test is to fragile.  If one single pixel is moved or changed just a little
> bit, the test is failing.  It can also sometimes be difficult to see small
> differences in pictures.

Regarding the difficulty in spotting the difference, one trick that
can be used to help with that is `composite -stereo' from ImageMagick.
See attached images for an example (out.png is the output).

Elvis

>
> Since the dump of the layout will be text based, it will be much simpler to
> spot differences.
>
> I guess I see it as an addition rather than a replacement. The picture
> approach is probably easier to create but more difficult to evaluate. Or not.
> I'm not sure.
>
> Btw, are you going to produce a picture per page or one huge picture per
> document?
>
>> Thorsten
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