[cairo] Win + SVG + Text

Simon Flannery simon_flannery at yahoo.com.au
Wed Jan 10 19:57:07 PST 2007


What is the status and level of text support in cario, and specifically SVG? I only ask 'cos I think I have found an issue (or dare I say the b word).

I am using cario to load and render a SVG containing text. Once successfully loaded and rendered, after about 45 seconds the application unexpectedly exits/quits and with no error message.

This only seems to be a problem when rendering SVG at high frame rates. For example (sorry non windows users):

/* Start the rsvg lib. */
/* Main message loop. */
   while (msg.message != WM_QUIT)
      bMsg = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
      if (bMsg != FALSE)
   /* Force a redraw. */
      InvalidateRect(hWnd, NULL, 0); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   if (g_my_svg != NULL)
   GError* pError = NULL;
   if ((g_my_svg = rsvg_handle_new_from_file("tmp.svg", &pError)) == NULL)
      MessageBox(NULL, pError->message, "Error", 0);
void ApplyDecal(HDC hdc, long width, long height)
   cairo_surface_t* surface = cairo_win32_surface_create(hdc);
   cairo_t* cr = cairo_create(surface);
/* Push the matrix stack. */
/* Scale up to full-window size. */
   cairo_scale(cr, ((double) width / (double) g_dimension.width), ((double) height / (double) g_dimension.height));
/* Paint the background context colort white. */
   cairo_set_source_rgba(cr, 1.0f, 1.0f, 1.0f, 1.0f);
/* Apply our decal. */
   rsvg_handle_render_cairo(g_my_svg, cr);
/* Pop the matrix stack. */
/* Force pipeline out. */
/* Clean up. */

And the SVG file can be as simple as:

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
<svg width="10cm" height="3cm" viewBox="0 0 1000 300"
     xmlns="http://www.w3.org/2000/svg" version="1.1">
  <text x="250" y="150" 
        font-family="Verdana" font-size="55" fill="blue" >Hello, out there</text>

So what's the deal? Has it been raised before? If so, what is the status? If new, what can be done? Work around etc...?

Thanks all.

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