Bug 12192 - Gdk.Pixbuf.FromDrawable not working correctly on mac
Summary: Gdk.Pixbuf.FromDrawable not working correctly on mac
Status: NEW
Alias: None
Product: Gtk#
Classification: Mono
Component: gtk-sharp ()
Version: unspecified
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2013-05-10 08:56 UTC by Lluis Sanchez
Modified: 2013-05-28 08:38 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

Test case in C (1.46 KB, text/plain)
2013-05-10 09:17 UTC, Michael Natterer
Patch to fix the color component confusion (4.44 KB, patch)
2013-05-14 10:40 UTC, Michael Natterer

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Description Lluis Sanchez 2013-05-10 08:56:09 UTC
Consider this small app: https://gist.github.com/slluis/dbbaa28b73e146ffac4e. It shows a window with a button. When clicking on it, the button is rendered into a pixbuf.

This is what I see on mac: http://screencast.com/t/dEzbffJH5d

The pixbuf is shown at the bottom, and the colors are wrong. This works on linux and windows, so this looks like a gtk/mac bug unless I'm doing something wrong in that code.
Comment 1 Michael Natterer 2013-05-10 09:17:06 UTC
Created attachment 3945 [details]
Test case in C

The same test case in C. I found the root of the problem in
the pixel copying in _gdk_quartz_image_copy_to_image() but what
I have to do in order to get the RGB(A) components in the right
order seems to contradict the apple docs. Will do some tests on
both patched and unpatched GTK+ (we are using CALayers now in our
version), and on both a window, and the root window.
Comment 2 Michael Natterer 2013-05-14 10:40:08 UTC
Created attachment 3964 [details]
Patch to fix the color component confusion

This is almost too evil to be true, see the comments in the patch,
but I believe it's correct. Can I get some review please before I
push this to upstream?
Comment 3 Michael Natterer 2013-05-28 08:38:14 UTC
Lluis, did the patch fix the swapped color channels for your use case?