[Octave-bug-tracker] [bug #48446] uicontrol extent returns sum of glyph width instead sum of advance width

[Andreas Weber]

URL:
  <http://savannah.gnu.org/bugs/?48446>

                 Summary: uicontrol extent returns sum of glyph width instead
sum of advance width
                 Project: GNU Octave
            Submitted by: andy1978
            Submitted on: Fri 08 Jul 2016 12:18:03 PM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Consider following code:


close all
graphics_toolkit qt
figure
t = uicontrol ("style", "text");
set (t, "string", "ABCDEFGH");
get (t, "extent")
ans =
    1    1   59   11


If I make a screenshot and measure the real width its approx 80 pixels.

As far as I can see the code in ft-text-renderer.cc
ft_text_renderer::compute_bbox sums up the glyph width and not the "advance
width" (https://www.freetype.org/freetype2/docs/glyphs/glyphs-3.html) so the
space between the glyphs is missing from the sum.






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