[pango/advance-transform] Fix advance widths with transforms

[Matthias Clasen <matthiasc src gnome org>]

commit ccb651dd2a876a4f4a4cb9351f05332173e709ba
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 5 06:57:44 2021 -0400

    Fix advance widths with transforms
    
    The hb_font_t we were passing to Harfbuzz
    for shaping was not taking context transforms
    into account, and therefore was not scaling
    advance widths as necessary. Always go through
    pangos glyph extents to fix this.
    
    Fixes: #620

 pango/shape.c | 42 +++++++++++++-----------------------------
 1 file changed, 13 insertions(+), 29 deletions(-)
---
diff --git a/pango/shape.c b/pango/shape.c
index 79489105..52a7aabb 100644
--- a/pango/shape.c
+++ b/pango/shape.c
@@ -148,16 +148,11 @@ pango_hb_font_get_glyph_h_advance (hb_font_t      *font,
                                    void           *user_data G_GNUC_UNUSED)
 {
   PangoHbShapeContext *context = (PangoHbShapeContext *) font_data;
+  PangoRectangle logical;
 
-  if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
-    {
-      PangoRectangle logical;
-
-      pango_font_get_glyph_extents (context->font, glyph, NULL, &logical);
-      return logical.width;
-    }
+  pango_font_get_glyph_extents (context->font, glyph, NULL, &logical);
 
-  return hb_font_get_glyph_h_advance (context->parent, glyph);
+  return logical.width;
 }
 
 static hb_position_t
@@ -167,16 +162,11 @@ pango_hb_font_get_glyph_v_advance (hb_font_t      *font,
                                    void           *user_data G_GNUC_UNUSED)
 {
   PangoHbShapeContext *context = (PangoHbShapeContext *) font_data;
+  PangoRectangle logical;
 
-  if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
-    {
-      PangoRectangle logical;
-
-      pango_font_get_glyph_extents (context->font, glyph, NULL, &logical);
-      return logical.height;
-    }
+  pango_font_get_glyph_extents (context->font, glyph, NULL, &logical);
 
-  return hb_font_get_glyph_v_advance (context->parent, glyph);
+  return logical.height;
 }
 
 static hb_bool_t
@@ -187,22 +177,16 @@ pango_hb_font_get_glyph_extents (hb_font_t          *font,
                                  void               *user_data G_GNUC_UNUSED)
 {
   PangoHbShapeContext *context = (PangoHbShapeContext *) font_data;
+  PangoRectangle ink;
 
-  if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
-    {
-      PangoRectangle ink;
-
-      pango_font_get_glyph_extents (context->font, glyph, &ink, NULL);
+  pango_font_get_glyph_extents (context->font, glyph, &ink, NULL);
 
-      extents->x_bearing = ink.x;
-      extents->y_bearing = ink.y;
-      extents->width     = ink.width;
-      extents->height    = ink.height;
-
-      return TRUE;
-    }
+  extents->x_bearing = ink.x;
+  extents->y_bearing = ink.y;
+  extents->width     = ink.width;
+  extents->height    = ink.height;
 
-  return hb_font_get_glyph_extents (context->parent, glyph, extents);
+  return TRUE;
 }
 
 static hb_font_t *