Bug 20736 – [GTK] GtkWebKit incompatible with rgba colormaps

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Dan S]

On systems with compiz running trying to make a program that utilises partial transparency in the same window as webkit causes assertion failures.

Specifically in a GtkWindow screen changed handler, if one calls something like the following.

GdkScreen   * screen = gtk_widget_get_screen(widget);
GdkColormap * colormap = gdk_screen_get_rgba_colormap(screen);
if (!colormap) colormap = gdk_screen_get_rgb_colormap(screen);
gtk_widget_set_colormap(widget, colormap);

You would trigger the problem. If the user doesn't have compiz or simulates that by providing a rgb colourmap instead of an rgba colourmap the issue does not exist.

I have modified the example gtk program to show this.

http://www.slello.com/tmp/gtkwebkit-rgba.zip

Thanks,
Dan

[Dan S]

Created attachment 23282 [details]
Example

[Dan S]

Created attachment 23283 [details]
Assertion Failures

[Dan S]

Created attachment 23284 [details]
Screenshot

[Martin Robinson]

Created attachment 45271 [details]
Patch for this issue

I've attached a patch for this issue.

[WebKit Review Bot]

Attachment 45271 [details] did not pass style-queue:

Failed to run "WebKitTools/Scripts/check-webkit-style" exit_code: 1
Last 5120 characters of output:
 tooltipWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:91:  Declaration has space between * and variable name in GtkWidget* menuBarWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:92:  Declaration has space between * and variable name in GtkWidget* menuBarItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:93:  Declaration has space between * and variable name in GtkWidget* menuPopupWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:94:  Declaration has space between * and variable name in GtkWidget* menuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:95:  Declaration has space between * and variable name in GtkWidget* imageMenuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:96:  Declaration has space between * and variable name in GtkWidget* checkMenuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:97:  Declaration has space between * and variable name in GtkWidget* treeViewWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:98:  Declaration has space between * and variable name in GtkTreeViewColumn* middleTreeViewColumn  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:99:  Declaration has space between * and variable name in GtkWidget* treeHeaderCellWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:100:  Declaration has space between * and variable name in GtkWidget* treeHeaderSortArrowWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:101:  Declaration has space between * and variable name in GtkWidget* expanderWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:102:  Declaration has space between * and variable name in GtkWidget* toolbarSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:103:  Declaration has space between * and variable name in GtkWidget* menuSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:104:  Declaration has space between * and variable name in GtkWidget* hpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:105:  Declaration has space between * and variable name in GtkWidget* vpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:106:  Declaration has space between * and variable name in GtkWidget* scrolledWindowWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:118:  Declaration has space between * and variable name in GdkColormap* colormap  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:281:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:291:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:295:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:460:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:461:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:725:  Missing space before ( in if(  [whitespace/parens] [5]
WebCore/platform/gtk/gtk2drawing.c:942:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:955:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:1423:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1464:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1803:  separator_width is incorrectly named. Don't use underscores in your identifier names.  [readability/naming] [4]
WebCore/platform/gtk/gtk2drawing.c:2601:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:3046:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:3061:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/RenderThemeGtk.cpp:171:  An else statement can be removed when the prior "if" concludes with a return, break, continue or goto statement.  [readability/control_flow] [4]
WebCore/platform/gtk/RenderThemeGtk.cpp:376:  Missing space after ,  [whitespace/comma] [3]
WebCore/platform/gtk/RenderThemeGtk.cpp:397:  Missing space after ,  [whitespace/comma] [3]
WebCore/platform/gtk/RenderThemeGtk.cpp:456:  Missing space after ,  [whitespace/comma] [3]
WebCore/platform/gtk/RenderThemeGtk.h:34:  Alphabetical sorting problem.  [build/include_order] [4]
Total errors found: 65

[Martin Robinson]

Created attachment 45272 [details]
Fix for this issue with style updates

I've updated the patch fixing the style issues in RenderThemeGtk.*, but not gtk2drawing.c because it originates from outside the project.

[WebKit Review Bot]

Attachment 45272 [details] did not pass style-queue:

Failed to run "WebKitTools/Scripts/check-webkit-style" exit_code: 1
Last 5120 characters of output:
pace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:87:  Declaration has space between * and variable name in GtkWidget* statusbarWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:88:  Declaration has space between * and variable name in GtkWidget* progresWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:89:  Declaration has space between * and variable name in GtkWidget* tabWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:90:  Declaration has space between * and variable name in GtkWidget* tooltipWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:91:  Declaration has space between * and variable name in GtkWidget* menuBarWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:92:  Declaration has space between * and variable name in GtkWidget* menuBarItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:93:  Declaration has space between * and variable name in GtkWidget* menuPopupWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:94:  Declaration has space between * and variable name in GtkWidget* menuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:95:  Declaration has space between * and variable name in GtkWidget* imageMenuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:96:  Declaration has space between * and variable name in GtkWidget* checkMenuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:97:  Declaration has space between * and variable name in GtkWidget* treeViewWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:98:  Declaration has space between * and variable name in GtkTreeViewColumn* middleTreeViewColumn  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:99:  Declaration has space between * and variable name in GtkWidget* treeHeaderCellWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:100:  Declaration has space between * and variable name in GtkWidget* treeHeaderSortArrowWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:101:  Declaration has space between * and variable name in GtkWidget* expanderWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:102:  Declaration has space between * and variable name in GtkWidget* toolbarSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:103:  Declaration has space between * and variable name in GtkWidget* menuSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:104:  Declaration has space between * and variable name in GtkWidget* hpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:105:  Declaration has space between * and variable name in GtkWidget* vpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:106:  Declaration has space between * and variable name in GtkWidget* scrolledWindowWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:118:  Declaration has space between * and variable name in GdkColormap* colormap  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:281:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:291:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:295:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:460:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:461:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:725:  Missing space before ( in if(  [whitespace/parens] [5]
WebCore/platform/gtk/gtk2drawing.c:942:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:955:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:1423:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1464:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1803:  separator_width is incorrectly named. Don't use underscores in your identifier names.  [readability/naming] [4]
WebCore/platform/gtk/gtk2drawing.c:2601:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:3046:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:3061:  Extra space before ( in function call  [whitespace/parens] [4]
Total errors found: 60

[Martin Robinson]

Created attachment 45297 [details]
Patch for this issue (rev2)

After talking with Xan, kov, and Company, I've made some improvement to my original patch. In particular, memory allocated per colormap is free at exit now.

[WebKit Review Bot]

Attachment 45297 [details] did not pass style-queue:

Failed to run "WebKitTools/Scripts/check-webkit-style" exit_code: 1
Last 5120 characters of output:
ame in GtkWidget* progresWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:88:  Declaration has space between * and variable name in GtkWidget* tabWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:89:  Declaration has space between * and variable name in GtkWidget* tooltipWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:90:  Declaration has space between * and variable name in GtkWidget* menuBarWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:91:  Declaration has space between * and variable name in GtkWidget* menuBarItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:92:  Declaration has space between * and variable name in GtkWidget* menuPopupWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:93:  Declaration has space between * and variable name in GtkWidget* menuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:94:  Declaration has space between * and variable name in GtkWidget* imageMenuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:95:  Declaration has space between * and variable name in GtkWidget* checkMenuItemWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:96:  Declaration has space between * and variable name in GtkWidget* treeViewWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:97:  Declaration has space between * and variable name in GtkTreeViewColumn* middleTreeViewColumn  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:98:  Declaration has space between * and variable name in GtkWidget* treeHeaderCellWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:99:  Declaration has space between * and variable name in GtkWidget* treeHeaderSortArrowWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:100:  Declaration has space between * and variable name in GtkWidget* expanderWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:101:  Declaration has space between * and variable name in GtkWidget* toolbarSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:102:  Declaration has space between * and variable name in GtkWidget* menuSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:103:  Declaration has space between * and variable name in GtkWidget* hpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:104:  Declaration has space between * and variable name in GtkWidget* vpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:105:  Declaration has space between * and variable name in GtkWidget* scrolledWindowWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:118:  Declaration has space between * and variable name in GdkColormap* colormap  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:126:  One line control clauses should not use braces.  [whitespace/braces] [4]
WebCore/platform/gtk/gtk2drawing.c:277:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:287:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:291:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:456:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:457:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:721:  Missing space before ( in if(  [whitespace/parens] [5]
WebCore/platform/gtk/gtk2drawing.c:939:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:952:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:1420:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1461:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1800:  separator_width is incorrectly named. Don't use underscores in your identifier names.  [readability/naming] [4]
WebCore/platform/gtk/gtk2drawing.c:2598:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:3043:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:3058:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:3307:  Declaration has space between * and variable name in GtkThemeParts* part  [whitespace/declaration] [3]
Total errors found: 64

[Adam Barth]

Are these style errors real or false positives?  If they're real, we should fix them.  If they're false positives, we need to teach the stylebot not to go nuts.

[Martin Robinson]

> Are these style errors real or false positives?  If they're real, we should fix
> them.  If they're false positives, we need to teach the stylebot not to go
> nuts.

Hey Adam, gtk2drawing.c and gtkdrawing.h are originally from Mozilla. I didn't touch the style of these files because of the guidelines at: http://trac.webkit.org/wiki/HackingGtk about them. Let me know if you'd prefer that I do something different.

[Adam Barth]

There's a thread on webkit-dev about this topic at the moment.  It might be worth contributing your thoughts.  We should either fix the style violations in those files or teach the style checker not to complain.  I'm not sure which is the better approach, but having the style checker spew false alarms isn't useful.

[Gustavo Noronha (kov)]

Comment on attachment 45297 [details]
Patch for this issue (rev2)

Wicked!

22         No new tests. (OOPS!)

We should explain here why this isn't testable right now.

5353 #include <string.h>
 54 #include <stdlib.h>

Poorly sorted

 108 static GHashTable *gPartsTable = NULL;
 109 static GtkThemeParts *gParts = NULL;

Bad placement for *'s

 227 gint
 228 moz_gtk_use_parts_for_drawable(GdkDrawable* parts);

gint should be in the same line, in the header file.

[Martin Robinson]

(In reply to comment #13)

> We should explain here why this isn't testable right now.
> Poorly sorted

Thanks for the review! I should have a fix for these first two issues soon.
 
>  108 static GHashTable *gPartsTable = NULL;
>  109 static GtkThemeParts *gParts = NULL;
> 
> Bad placement for *'s
> 
>  227 gint
>  228 moz_gtk_use_parts_for_drawable(GdkDrawable* parts);
> 
> gint should be in the same line, in the header file.

Since these files originate from Mozilla, I think using the original style in this case will make it easier for the patch to move back upstream if there is interest. I'm not sure if any resolution came from the discussion of this issue on the mailing list.

[Martin Robinson]

Created attachment 45666 [details]
Patch for this issue with style fixes

I've fixed the style and changelog issues from the previous review.

[WebKit Review Bot]

Attachment 45666 [details] did not pass style-queue:

Failed to run "WebKitTools/Scripts/check-webkit-style" exit_code: 1
Last 3072 characters of output:
atform/gtk/gtk2drawing.c:101:  Declaration has space between * and variable name in GtkWidget* toolbarSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:102:  Declaration has space between * and variable name in GtkWidget* menuSeparatorWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:103:  Declaration has space between * and variable name in GtkWidget* hpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:104:  Declaration has space between * and variable name in GtkWidget* vpanedWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:105:  Declaration has space between * and variable name in GtkWidget* scrolledWindowWidget  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:118:  Declaration has space between * and variable name in GdkColormap* colormap  [whitespace/declaration] [3]
WebCore/platform/gtk/gtk2drawing.c:126:  One line control clauses should not use braces.  [whitespace/braces] [4]
WebCore/platform/gtk/gtk2drawing.c:277:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:287:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:291:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:456:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:457:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:721:  Missing space before ( in if(  [whitespace/parens] [5]
WebCore/platform/gtk/gtk2drawing.c:939:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:952:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:1420:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1461:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1800:  separator_width is incorrectly named. Don't use underscores in your identifier names.  [readability/naming] [4]
WebCore/platform/gtk/gtk2drawing.c:2598:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:3043:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:3058:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:3307:  Declaration has space between * and variable name in GtkThemeParts* part  [whitespace/declaration] [3]
Total errors found: 63

[Benjamin Otte]

2 things from looking at the patch:
1) GtkThemeParts are allocated with g_slice_new0() but cleared with g_free() (in the hashtable).
2) I don't like using the hash table. Couldn't we have an API like:
/* call once per page and store in RenderThemeGtk */
GtkThemeParts *gtk_theme_parts_new (GdkDrawable *);
/* call instead of moz_gtk_use_parts_for_drawable */
void gtk_theme_parts_use (GtkThemeParts *);
/* obvious */
gtk_theme_parts_free (GtkThemeParts *);
That gets rid of stupid globals.
It does create new widgets for every RenderTheme. I don't think it matters though.

[Christian Dywan]

I think you should not use Gtk or gtk as structure and function prefixes respectively. I have experienced confusion with people trying to debug functions named with a foreign API prefix and it's best to avoid that.

[Martin Robinson]

Created attachment 46109 [details]
Updated patch

[WebKit Review Bot]

Attachment 46109 [details] did not pass style-queue:

Failed to run "WebKitTools/Scripts/check-webkit-style" exit_code: 1
WebCore/platform/gtk/gtkdrawing.h:304:  moz_gtk_destroy_theme_parts_widgets is incorrectly named. Don't use underscores in your identifier names.  [readability/naming] [4]
WebCore/platform/gtk/gtk2drawing.c:208:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:218:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:222:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:387:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:388:  Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side.  [whitespace/operators] [4]
WebCore/platform/gtk/gtk2drawing.c:652:  Missing space before ( in if(  [whitespace/parens] [5]
WebCore/platform/gtk/gtk2drawing.c:866:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:879:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:1347:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1388:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:1727:  separator_width is incorrectly named. Don't use underscores in your identifier names.  [readability/naming] [4]
WebCore/platform/gtk/gtk2drawing.c:2525:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:2970:  Weird number of spaces at line-start.  Are you using a 4-space indent?  [whitespace/indent] [3]
WebCore/platform/gtk/gtk2drawing.c:2985:  Extra space before ( in function call  [whitespace/parens] [4]
WebCore/platform/gtk/gtk2drawing.c:3235:  moz_gtk_destroy_theme_parts_widgets is incorrectly named. Don't use underscores in your identifier names.  [readability/naming] [4]
Total errors found: 16

[Gustavo Noronha (kov)]

(In reply to comment #20)
> Attachment 46109 [details] did not pass style-queue:
> 
> Failed to run "WebKitTools/Scripts/check-webkit-style" exit_code: 1

Reported these as https://bugs.webkit.org/show_bug.cgi?id=33771.

[Gustavo Noronha (kov)]

Comment on attachment 46109 [details]
Updated patch

Looks good to me.

[WebKit Commit Bot]

Comment on attachment 46109 [details]
Updated patch

Clearing flags on attachment: 46109

Committed r53372: <http://trac.webkit.org/changeset/53372>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.