[Denemo-devel] [bug #32550] Breve and longa cause inordinately high cpu usage

[Richard Shann]

Update of bug #32550 (project denemo):

                Severity:              3 - Normal => 4 - Important          
                  Status:                    None => Confirmed              
                 Summary: Breve and longa cause inordinately high cpu usage on
windows xp => Breve and longa cause inordinately high cpu usage

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Follow-up Comment #1:

This is not specific to windows. It is probably due to the .svg images being
1000x1000 in "size"
We need cairo expertise to solve this. The code is drawing by  calling 
cairo_mask(cr, pattern);
on a pattern derived from a 1000x1000 SVG image stored in a file name.svg. The
code to generate the pattern is this:

    gchar *filename = g_strconcat(name, ".svg", NULL);

    gfloat thescale=0.04, offx=500.0, offy=500.0;

    g_print("Scale %f and offset (%f, %f) are chosen to match the set of .svgs
extracted from the emmenthaler fontn", thescale, offx, offy);
    RsvgHandle *handle = rsvg_handle_new_from_file(filename, &error);
    g_free(filename);
    if(handle==NULL) {
      if(error)
        g_warning("Could not open %s error %sn", basename, error->message);
      else
        g_warning("Opening %s, Bug in librsvg:rsvg handle null but no error 
message",
basename);
      return FALSE;
    }
    RsvgDimensionData thesize;
    rsvg_handle_get_dimensions(handle, &thesize); 
    
    g_print("size %d x %d", thesize.width, thesize.height);

    cairo_surface_t *surface =   (cairo_surface_t
*)cairo_svg_surface_create_for_stream (NULL, NULL, (gdouble)thesize.width, 
(gdouble)thesize.height); 
    cairo_t *cr = cairo_create(surface);
    cairo_translate(cr, offx, offy);
    cairo_scale(cr, thescale, -thescale);
    g_print("scaled %f %f %fn", thescale, offx, offy);

    rsvg_handle_render_cairo(handle, cr);
    rsvg_handle_close(handle, NULL);
    g_object_unref(handle);
    cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
    cairo_pattern_reference(pattern); 
    cairo_destroy(cr);

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