<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=utf-8"> <meta name=Generator content="Microsoft Word 12 (filtered medium)"> <style>  </style>  </head> <body lang=EN-GB link=blue vlink=purple> <div class=Section1> Background: I was tired of using xwd, especially as it does not support RGBA 32 bit visuals. I hacked together a program from the latest xwininfo (based on XCB) to get the Window ID using a pointer selection and then created a surface based on that ID.<o:p></o:p> <o:p> </o:p> #ifdef XLIB<o:p></o:p> cairo_surface_t *surface = cairo_xlib_surface_create(dpy, target_win, vinfos[0].visual, geom->width, geom->height);<o:p></o:p> #else<o:p></o:p> cairo_surface_t *surface = cairo_xcb_surface_create(conn, target_win, v, geom->width, geom->height);<o:p></o:p> #endif<o:p></o:p> free(geom);<o:p></o:p> cairo_surface_write_to_png(surface, file);<o:p></o:p> <o:p> </o:p> This works fine for 24-bit visual windows but with 32-bit visuals (eg gnome-terminal) I get the following error.<o:p></o:p> <o:p> </o:p> xwd: cairo-xcb-surface.c:504: _get_image: Assertion `reply->depth == surface->depth' failed.<o:p></o:p> <o:p> </o:p> Using xlib on 32-bit visuals doesn’t fail but instead produces a zero sized PNG file.<o:p></o:p> <o:p> </o:p> I understand this may be an abuse of cairo for which it wasn’t designed and I maybe should use XImage or Xrender (I haven’t actually looked at render for image transfers) but as cairo has most of this code already I was hoping for some pointers.<o:p></o:p> <o:p> </o:p> Many thanks<o:p></o:p> <o:p> </o:p> Ross<o:p></o:p> <o:p> </o:p> Ross Alexander<o:p></o:p> SAP Basis<o:p></o:p> NEC Europe Ltd<o:p></o:p> European Information Systems<o:p></o:p> Tel:     +44 20 8752 3394<o:p></o:p> <o:p> </o:p> IMPORTANT: The information contained in this e-mail and attachment (if any) is intended for the person to whom it is addressed and may contain confidential and/or privileged information. 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