<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="EN-US" link="blue" vlink="purple"> <div class="WordSection1"> Hi, Vector,<o:p></o:p> <o:p> </o:p> If you use cairo/gl backend, there is no need to make GL calls directly.  <o:p></o:p> <o:p> </o:p> For example<o:p></o:p> <o:p> </o:p> /* create a gl surface */<o:p></o:p> cairo_surface_t *surface = cairo_gl_surface_create_for_window (….);<o:p></o:p> <o:p> </o:p> cairo_t *cr = cairo_create (surface);<o:p></o:p> <o:p> </o:p> /* draw text on gl surface */<o:p></o:p> cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL,  CAIRO_FONT_WEIGHT_BOLD);  cairo_set_font_size (cr, 32.0);  cairo_set_source_rgb (cr, 1.0, 1.0, 0.0);  cairo_show_text (cr, "HELLO");<o:p></o:p> <o:p> </o:p> /* stroke a rectangle on gl surface */<o:p></o:p> cairo_rectangle (cr, 10, 10, 100, 100);<o:p></o:p> cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 1.0);<o:p></o:p> cairo_stroke (cr);<o:p></o:p> <o:p> </o:p> /* display gl surface on screen */<o:p></o:p> cairo_gl_surface_swapbuffers (surface);<o:p></o:p> <o:p> </o:p> /* clean up */<o:p></o:p> cairo_surface_destroy (surface);<o:p></o:p> cairo_destroy (cr);<o:p></o:p> <o:p> </o:p> <o:p> </o:p> Hope this helps<o:p></o:p> <o:p> </o:p> Henry<o:p></o:p> <o:p> </o:p> <div> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in"> From: cairo-bounces+hsong=sisa.samsung.com@cairographics.org [mailto:cairo-bounces+hsong=sisa.samsung.com@cairographics.org] On Behalf Of Victor henri Sent: Wednesday, January 04, 2012 6:38 AM To: cairo@cairographics.org Subject: [cairo] trouble with Cairo text in OpenGL<o:p></o:p> </div> </div> <o:p> </o:p> <div> <div> Hello I have trouble drawing text in an OpenGL texture with Cairo It works with SDL and SDL_ttf with :     GLuint textureId;               SDL_Color Color = {150, 0, 240};         SDL_Surface *Message = TTF_RenderText_Blended(font, "Hello!", Color);         unsigned Texture = 0;         glGenTextures(1, &Texture);         glBindTexture(GL_TEXTURE_2D, Texture);         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Message->w, Message->h, 0, GL_BGRA, GL_UNSIGNED_BYTE, Message->pixels);                 glBegin(GL_QUADS);         glColor4f(1, 0, 0, 1);         glTexCoord2d(0, 0); glVertex3d(0, 0, 0);         glTexCoord2d(1, 0); glVertex3d(0.2, 0, 0);         glTexCoord2d(1, 1); glVertex3d(0.2, -0.2, 0);         glTexCoord2d(0, 1); glVertex3d(0,  -0.2, 0);         glEnd();                 glDeleteTextures(1, &Texture);                 SDL_FreeSurface(Message); Clearly, the Message->pixels argument in "glTexImage2D" seems important; if I replace it with NULL, I get random lines and points. If I do this with Cairo :         cairo_surface_t *surface;         cairo_t *cr;         GLuint textureId;         unsigned char* surfaceData;         surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 64, 64);         cr = cairo_create (surface);         cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL,  CAIRO_FONT_WEIGHT_BOLD);         cairo_set_font_size (cr, 32.0);         cairo_set_source_rgb (cr, 1.0, 1.0, 0.0);         cairo_show_text (cr, "HELLO");                 surfaceData = cairo_image_surface_get_data (surface);                 unsigned Texture = 0;         glGenTextures(1, &Texture);         glBindTexture(GL_TEXTURE_2D, Texture);         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, cairo_image_surface_get_width (surface), cairo_image_surface_get_height (surface), 0, GL_BGRA, GL_UNSIGNED_BYTE, surfaceData);                        glBegin(GL_QUADS);         glColor4f(1, 0, 0, 1);        glTexCoord2d(0, 0); glVertex3d(0, 0, 0);         glTexCoord2d(1, 0); glVertex3d(0.2, 0, 0);         glTexCoord2d(1, 1); glVertex3d(0.2, -0.2, 0);         glTexCoord2d(0, 1); glVertex3d(0,  -0.2, 0);         glEnd();                 glDeleteTextures(1, &Texture);         cairo_destroy (cr);         cairo_surface_destroy (surface); If I do that I get a few red points but not the text I want. I use the " cairo_image_surface_get_data (surface)" function to get the appropriate data and to give it to glTextImage2D but I suppose this is where it won't work. In some examples I have come across the "create_cairo_context" through which surfaceData can be taken. But this function seems completely unknown on my system... I am using Ubuntu Linux 11.10 (lateste version) Please could give me some help about this? Victor<o:p></o:p> </div> </div> </div> </body> </html>