[pango/simple-fontmap: 12/18] Fix glyph extents to look right

[Matthias Clasen <matthiasc src gnome org>]

commit b2cbaf2ad1f42a32586b9295fa3e1b1e2fc38adc
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Oct 21 13:54:19 2021 -0500

    Fix glyph extents to look right
    
    This is done purely by visual inspection.
    Not clear to me why this is necessary.
    
    To test this, I've used
    
    pango-view --font-file /usr/share/fonts/cantarell/Cantarell-VF.otf \
               --font="Cantarell 64" \
               --gravity=east --gravity-hint=strong --rotate=-90 \
               --text "Vertical" \
               --annotate=glyph
    
    Remove the --font-file argument to see the rendering
    with the current code.

 pango/pango-hbfont.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/pango/pango-hbfont.c b/pango/pango-hbfont.c
index 86729338..a17f52bf 100644
--- a/pango/pango-hbfont.c
+++ b/pango/pango-hbfont.c
@@ -406,12 +406,18 @@ pango_hb_font_get_glyph_extents (PangoFont      *font,
 
   if (ink_rect)
     {
+      PangoMatrix matrix = PANGO_MATRIX_INIT;
+
       ink_rect->x = extents.x_bearing;
       ink_rect->width = extents.width;
       ink_rect->y = - extents.y_bearing;
       ink_rect->height = - extents.height;
 
       pango_matrix_transform_rectangle (&self->face->matrix, ink_rect);
+
+      /* FIXME: why is this required */
+      pango_matrix_rotate (&matrix, - pango_gravity_to_rotation (PANGO_HB_FONT (font)->gravity) * 180. / 
G_PI);
+      pango_matrix_transform_rectangle (&matrix, ink_rect);
     }
 
   if (logical_rect)