[cairo-bugs] [Bug 69617] New: [PATCH] GIMP's color picker of color dialog not work, returns black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69617

          Priority: medium
            Bug ID: 69617
          Assignee: cairo-bugs at cairographics.org
           Summary: [PATCH] GIMP's color picker of color dialog not work,
                    returns black
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: Windows (All)
          Reporter: sixtysix at inwind.it
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: win32 backend
           Product: cairo

Created attachment 86200
  --> https://bugs.freedesktop.org/attachment.cgi?id=86200&action=edit
quick hack

I've investigated GIMP's https://bugzilla.gnome.org/show_bug.cgi?id=676708,
on Windows XP, and the cause is that 'GetClipBox', on XP, for desktop's hdc 
returns NULLREGION and an empty rect. That produces an empty win32 surface 
which then, used as a source, paints nothing (do_nothing returns true).

With the attached patch GIMP's color dialog color picker returns the color
under the pointer also on XP.

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