<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="ZH-CN" link="blue" vlink="purple" style="text-justify-trim:punctuation"> <div class="WordSection1"> Hi,<o:p></o:p> <o:p> </o:p> I am use cairo-6816f70da54e730e88b98c8592aa6fc84e082928.zip(latest cario versio, 2011-12-16) to develop application. And I am use the OpenGL ES2.0 backend for cairo.<o:p></o:p> <o:p> </o:p> I found that the composition result was incorrect if I use cairo_push_group and cairo_pop_group_to_source to generate the source. But the result will be correct if I do not use it. <o:p></o:p> <o:p> </o:p> Here is my code with incorrect result.<o:p></o:p> <o:p> </o:p> /************************code begin**************************************/<o:p></o:p> cairo_surface_t* cairosurf = cairo_gl_surface_create_for_egl_higo(1280, 720);<o:p></o:p> cairo_t* cr = cairo_create(cairosurf);<o:p></o:p> <o:p> </o:p> <o:p> </o:p> cairo_translate(cr, 0, 0);<o:p></o:p> <o:p> </o:p> cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, 0.8);<o:p></o:p> cairo_rectangle(cr, 100, 100, 300 , 200);<o:p></o:p> cairo_fill (cr);<o:p></o:p> <o:p> </o:p> cairo_push_group (cr);<o:p></o:p> <o:p> </o:p> cairo_set_source_rgba (cr, 0.0, 0.0, 0.9, 0.4);<o:p></o:p> cairo_rectangle(cr, 150, 150, 600, 400);<o:p></o:p> cairo_fill (cr);<o:p></o:p> <o:p> </o:p> cairo_pop_group_to_source (cr);<o:p></o:p> <o:p> </o:p> cairo_set_operator (cr, CAIRO_OPERATOR_OVER);<o:p></o:p> <o:p> </o:p> cairo_paint (cr);       <o:p></o:p> cairo_gl_higo_refresh();<o:p></o:p> /************************code end**************************************/<o:p></o:p> <o:p> </o:p> Here is my code with correct result.<o:p></o:p> <o:p> </o:p> /************************code begin**************************************/<o:p></o:p> cairo_surface_t* cairosurf = cairo_gl_surface_create_for_egl_higo(1280, 720);<o:p></o:p> cairo_t* cr = cairo_create(cairosurf);<o:p></o:p> <o:p> </o:p> <o:p> </o:p> cairo_translate(cr, 0, 0);<o:p></o:p> <o:p> </o:p> cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, 0.8);<o:p></o:p> cairo_rectangle(cr, 100, 100, 300 , 200);<o:p></o:p> cairo_fill (cr);<o:p></o:p> <o:p> </o:p> cairo_set_operator (cr, CAIRO_OPERATOR_OVER);<o:p></o:p> <o:p> </o:p> cairo_set_source_rgba (cr, 0.0, 0.0, 0.9, 0.4);<o:p></o:p> cairo_rectangle(cr, 150, 150, 600, 400);<o:p></o:p> cairo_fill (cr);<o:p></o:p> <o:p> </o:p> cairo_paint (cr);       <o:p></o:p> cairo_gl_higo_refresh();<o:p></o:p> /************************code end**************************************/<o:p></o:p> <o:p> </o:p> I used some method to get group source and paint its texture onto screen after call cairo_paint (cr). I found that the texture content is wrong. <o:p></o:p> <o:p> </o:p> Can anybody give me any suggestions to solve the problem?<o:p></o:p> <o:p> </o:p> Thanks in advance.<o:p></o:p> <o:p> </o:p> Best Regards<o:p></o:p> Ming<o:p></o:p> <o:p> </o:p> <o:p> </o:p> </div> </body> </html>