[cairo-bugs] [Bug 18962] New: Request Additional Format Support

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Dec 8 15:29:21 PST 2008


           Summary: Request Additional Format Support
           Product: cairo
           Version: 1.8.4
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: win32 backend
        AssignedTo: cairo-bugs at cairographics.org
        ReportedBy: bfulgham at gmail.com
         QAContact: cairo-bugs at cairographics.org

I am using Cairo for the redistributable WebKit build on Windows.  There are a
few cases where I need to access the resulting 32-bit ARGB format images
produced with Cairo via an HBITMAP window handle.

Unfortunately, none of the existing API calls are ideal:

1.  cairo_win32_surface_create(HDC dc) only returns 24-bit bitmaps.
2.  cairo_win32_surface_create_with_dib () does what I want, but does not
provide access to the internal HBITMAP object.
3.  cairo_image_surface_create_for_data is almost exactly what I need, except
there is no way to tag it internally so that drawing functions properly invert
the bitmap representation so images are shown right-side-up.

Much of the functionality I would like access to exists in the private
(internal) _cairo_win32_surface_create_for_dc function (in
cairo-win32-surface.c), but is obviously not accessible to external users.

Some of my trouble could be mitigated by adding a new function
'cairo_win32_surface_get_bitmap' (analogous to cairo_win32_surface_get_dc) that
simply returned the internal HBITMAP reference in cairo_win32_surface_t.

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