May 2008 - Dillo-dev - lists.mailman3.com

an experiment in widget coloring
by corvid＠lavabit.com 27 May '08

27 May '08

I saw a page that reminded me that the matter of when to have light text vs. dark text on widgets was not decided. earlier discussion: http://lists.auriga.wearlab.de/pipermail/dillo-dev/2008-February/003760.html trimmed-down bit of the page I saw: <form> <table bgcolor="#F8C473"> <tr><td> <input type="submit" value="I can hardly see the text"> </table> </form>

1 0

[patch]: html.cc cleanup: DilloHtml::currentForm()
by onepoint＠starurchin.org 27 May '08

27 May '08

This patch adds a DilloHtml::currentForm() method and uses it to refactor wherever possible. This reduces the number of instances of the "foo->size() - 1" idiom in html.cc from 23 to 13! Regards, Jeremy Henty

3 8

[patch] dw2 memory reduction
by Johannes.Hofmann＠gmx.de 26 May '08

26 May '08

Hi, attached is patch to reduce the memory usage of dw2: * Styles are now reused if they are equal. This brings down the number of Style objects on the mysql page from around 180000 to 23000 and reduces memory usage by about 25M at the cost of an additional HashTable. Maybe the hash table should be part of fltkplatform as the hash tables for Color and Font? There would be even more sharing of styles possible, if x_link would not be part of style. On the other hand about 3M for styles on the huge mysql page is pretty ok. * Size of struct Word is reduced by 4 integers by using shorts. I know that this is questionable, but I think in the case of struct Word that can be allocated a lot it is worth the hassle. Please check whether my assumption that space lengths and word lengths can be stored in shorts are valid in general. * SimpleVector no longer preallocates memory if it's not necessary. This actually saves some megabytes here! With these changes memory usage on the mysql page is 179M here. Cheers, Johannes

3 8

Fuzzing dillo
by 4winter＠informatik.uni-hamburg.de 26 May '08

26 May '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi :) I was playing around with Michal Zalewskis html fuzzer 'mangle' trying to crash dillo and succeeded :). Furthermore I was able to reduce the ~100k page that was triggering a NULL pointer dereferencing to three tags (see the attached page). Some digging around (html.cc is a monster ^^) revealed that style_attrs.setBorderColor ( Color::createShaded(HT2LT(html), style_attrs.backgroundColor->getColor())); in Html_tag_open_table was failing due to the fact that style_attrs.backgroundColor was NULL. Html_tag_open_select sets the backgroundColor to NULL and this is inherited by the table tag since it's a child of the select tag. Greping through the code shows that there are at least two other functions that set backgroundColor (and color) to NULL (Html_tag_open_input and Html_tag_open_isindex) and twelve locations calling getColor() on either color or backgroundColor. I have no idea how to _properly_ fix this issue. Furthermore I'd suggest to break down html.cc into several files. It is about 6000 lines long (-> hard to dig into) and it takes gcc roughly five seconds to compile on my box. Justus - -- gpg key fingerprint: C82D 382A AB38 1A54 5290 19D6 A0F9 B035 686C 6996 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFIOUmmoPmwNWhsaZYRAprIAJ9X9HSzc4Isx+NyFWxlfSFPrwj/VACdF8GD x67scPvD6FCrOezl69NbaHA= =z0iv -----END PGP SIGNATURE-----

4 10

patch: http_proxyuser preference
by corvid＠lavabit.com 26 May '08

26 May '08

After I sent the preferences mail yesterday, I found that I overlooked one. The headers look good, but I have no way to test it for real.

2 1

patch: goodbye to use_oblique and transient_dialogs
by corvid＠lavabit.com 26 May '08

26 May '08

It's nice to get to delete things, and especially preferences, since they have a natural tendency to grow and grow and grow.

2 1

remaining preferences
by corvid＠lavabit.com 26 May '08

26 May '08

# Dicache is where the Decompressed Images are cached (not the original ones). # If you have a lot of memory and a slow CPU, use YES, otherwise use NO use_dicache The code always behaves like use_dicache=NO /* * Unrefs the counter of a dicache entry, and _if_ no DwImage is acessing * this buffer, then we call Dicache_free to do the dirty job. */ void a_Dicache_unref(const DilloUrl *Url, int version) { DICacheEntry *entry; if ((entry = Dicache_get_entry_version(Url, version))) { /*if (--entry->RefCount == 0 && (entry->next || !prefs.use_dicache)) {*/ if (--entry->RefCount == 0) { Dicache_remove(Url, version); } } } Perhaps this was done for a reason. # If you prefer oblique over italic fonts, uncoment next line use_oblique FLTK doesn't know about oblique. I don't know whether anybody cares enough to change that. I don't. # Show tooltip popup for images? # Note: We use the "title" attribute and not "alt". # More info at: http://bugzilla.mozilla.org/show_bug.cgi?id=25537 show_tooltip I did the easy part of tooltips long ago, but I haven't been able to care enough to want to do the fltk part. # Set this to YES, if you want to limit the word wrap width to the vieport # width (may be useful for iPAQ) limit_text_width It doesn't do anything. I don't think it's ever done anything. It sure would be nice if it did something. But I don't have the expertise to change that. # Here you can choose to hide some widgets of the dillo panel... show_menubar Not currently used. Meaningless with the current panel-cycling with right click on the search button (which I imagine is not going to be the permanent way to do that). # Enabling this will restrain OpenUrl and FindText, but may be required # for the ION window manager. transient_dialogs from fltk::Window::child_of(): Tell the system that this window will not have an icon, it will dissappear and reappear when \a parent is iconized or shown, and it is forced to always be above \a parent. On X this is called a "Transient window", and Windows calls this a "overlapping child". \a parent is different than the parent(), which must be zero. (and down in fltk::CreatedWindow::create, there's a if (window->child_of() && window->child_of()->shown()) XSetTransientForHint(xdisplay, x->xid, window->child_of()->i->xid);) If Justus gets rid of the dialogs, obviously the pref can be removed. Enabling this means making our own dialogs for message(), choice(), input(). # When filling forms, our default behaviour is to submit on enterpress, # but only when there's a single text entry (to avoid incomplete submits). # OTOH, if you have to fill the same form lots of times, you may find # useful to keep away from the mouse by forcing enter to submit. enterpress_forces_submit The code currently always submits on enter. I like it that way and didn't realize that it wasn't supposed to.

3 7

[BUG]: Redirect to previous page + Reload crashes
by onepoint＠starurchin.org 25 May '08

25 May '08

Dillo crashes as follows: * Point Dillo at http://starurchin.org:8080/dillo/here * Click the "There" link. Dillo is redirected back to the "Here" page. * Click the "Reload" button. * Dillo crashes inside a_Nav_reload() (nav.c) at the line "if (URL_FLAGS(url) & URL_Post) {" because url is NULL. I noticed this a few weeks ago but only just found a simple way to trigger it. Any ideas why this is happening? Regards, Jeremy Henty

3 6

Q: why does Nav_stack_clean() free the data and Nav_stack_truncate() not?
by onepoint＠starurchin.org 25 May '08

25 May '08

While reviewing nav.c to figure out the reload crash bug I noticed something that seems inconsistent: both Nav_stack_truncate() and Nav_stack_clean() remove items from the navigation stack, yet Nav_stack_truncate() does not free the data it removes and Nav_stack_clean() does. Is this a bug? If not, what haven't I understood? Regards, Jeremy Henty

2 3

Profiling works!
by onepoint＠starurchin.org 24 May '08

24 May '08

I added -pg to LDFLAGS, CFLAGS and CXXFLAGS and dillo generated a nice gmon.prof ! However, it puts it in /tmp (perhaps that's why it didn't seem to be working). Dillo also dumps its core to /tmp when it crashes, perhaps for the same reason? Regards, Jeremy Henty

2 2