Fix display of compound glyphs that employ simple transforms

* src/sfnt.c (sfnt_transform_coordinates): Always compute an
affine transform matrix except if no scale is provided at all.
Unconditionally apply x_off and y_off.
(sfnt_decompose_compound_glyph): Delete arguments OF_X and
OFF_Y.  Apply component offsets after writing simple glyph
contours.
(sfnt_decompose_glyph): Modify for new calling convention.
(sfnt_transform_f26dot6): Modify analogously to
sfnt_decompose_compound_glyph.  Also correct anchor offset
computation to scale the unscaled component anchor coordinates
by the interpreter scale.
(sfnt_interpret_compound_glyph_1): Also modify for new calling
convention.
* src/sfnt.h (struct sfnt_compound_glyph_component): <u>: Make
scale fields signed.

1 files changed, 7 insertions, 7 deletions

diff --git a/src/sfnt.h b/src/sfnt.h
index 48d22aa8d29..6f93393c1d3 100644
--- a/src/sfnt.h
+++ b/src/sfnt.h
@@ -623,16 +623,16 @@ struct sfnt_compound_glyph_component
 
   /* Various scale formats.  */
   union {
-    uint16_t scale;
+    int16_t scale;
     struct {
-      uint16_t xscale;
-      uint16_t yscale;
+      int16_t xscale;
+      int16_t yscale;
     } a;
     struct {
-      uint16_t xscale;
-      uint16_t scale01;
-      uint16_t scale10;
-      uint16_t yscale;
+      int16_t xscale;
+      int16_t scale01;
+      int16_t scale10;
+      int16_t yscale;
     } b;
   } u;
 };