<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=us-ascii"> <meta name="Generator" content="Microsoft Word 12 (filtered medium)"> <style></style> </head> <body lang="CS" link="blue" vlink="purple"> <div class="WordSection1"> Hi,<o:p></o:p> <o:p> </o:p> My use case is to determine the size of some rendering and then create an image with the determined size. I thought that unbounded (NULL extents) recording surface is exactly the way to go. A code like below however didn’t work. (I think <a href="https://bugs.freedesktop.org/show_bug.cgi?id=31657">https://bugs.freedesktop.org/show_bug.cgi?id=31657</a> is related)<o:p></o:p> <o:p> </o:p> recording_surf = cairo_recording_surface_create( CAIRO_CONTENT_COLOR_ALPHA, NULL );<o:p></o:p> recording_ctx = cairo_create( recording_surf );<o:p></o:p> cairo_scale( recording_ctx, m_dpi_x_ratio, m_dpi_y_ratio );<o:p></o:p> ...do the rendering...<o:p></o:p> cairo_recording_surface_ink_extents( recording_surf, &x, &y, &w, &h );<o:p></o:p> image_surf = cairo_image_surface_create( CAIRO_FORMAT_ARGB32, w, h );<o:p></o:p> image_ctx = cairo_create( image_surf );<o:p></o:p> cairo_set_source_surface( image_ctx, recording_surf, x, y );<o:p></o:p> cairo_paint( image_ctx );<o:p></o:p> <o:p> </o:p> During the paint cairo wanted to create a huge (unbounded) image and it failed. What helped me was the following hack.<o:p></o:p> <o:p> </o:p> cairo_rectangle_t rect;<o:p></o:p> rect.x = x;<o:p></o:p> rect.y = y;<o:p></o:p> rect.width = w - x; //not sure why there has to be –x and -y<o:p></o:p> rect.height = h - y;<o:p></o:p> recording_surf_dummy = cairo_recording_surface_create( CAIRO_CONTENT_COLOR_ALPHA, &rect );<o:p></o:p> cairo_recording_surface_t* recording_surf_dummy_( (cairo_recording_surface_t*)recording_surf_dummy );<o:p></o:p> cairo_recording_surface_t* recording_surf_( (cairo_recording_surface_t*)recording_surf );<o:p></o:p> recording_surf_->extents = recording_surf_dummy_->extents;<o:p></o:p> recording_surf_->extents_pixels = recording_surf_dummy_->extents_pixels;<o:p></o:p> recording_surf_->unbounded = recording_surf_dummy_->unbounded;<o:p></o:p> <o:p> </o:p> Still I get some small differences between the replayed output and an output directly to image surface without recording surface (and with some arbitrary hardcoded size).<o:p></o:p> <o:p> </o:p> Vojtech<o:p></o:p> <o:p> </o:p> </div> </body> </html>