Fix graphics state when instructing glyphs

* src/sfntfont.c (sfntfont_get_glyph_outline): Take new argument
STATE and restore it prior to instructing the glyph.
(sfntfont_measure_instructed_pcm, sfntfont_measure_pcm)
(sfntfont_draw): Adjust accordingly.

1 files changed, 13 insertions, 5 deletions

diff --git a/src/sfntfont.c b/src/sfntfont.c
index 607ab30afd5..9ab76a3082b 100644
--- a/src/sfntfont.c
+++ b/src/sfntfont.c
@@ -1457,7 +1457,7 @@ sfntfont_dereference_outline (struct sfnt_glyph_outline *outline)
    LOCA_LONG and LOCA_SHORT, whichever is set.
 
    If INTERPRETER is non-NULL, then possibly use the unscaled glyph
-   metrics in METRICS when instructing the glyph.
+   metrics in METRICS and the interpreter STATE to instruct the glyph.
 
    Return the outline with an incremented reference count and enter
    the generated outline into CACHE upon success, possibly discarding
@@ -1472,7 +1472,8 @@ sfntfont_get_glyph_outline (sfnt_glyph glyph_code,
                             struct sfnt_loca_table_short *loca_short,
                             struct sfnt_loca_table_long *loca_long,
                             struct sfnt_interpreter *interpreter,
-                            struct sfnt_glyph_metrics *metrics)
+                            struct sfnt_glyph_metrics *metrics,
+                            struct sfnt_graphics_state *state)
 {
   struct sfnt_outline_cache *start;
   struct sfnt_glyph_outline *outline;
@@ -1518,6 +1519,10 @@ sfntfont_get_glyph_outline (sfnt_glyph glyph_code,
 
   if (interpreter && glyph->simple)
     {
+      /* Restore the interpreter state from the snapshot taken after
+         loading the preprogram.  */
+      interpreter->state = *state;
+
       error = sfnt_interpret_simple_glyph (glyph, interpreter,
                                            metrics, &value);
 
@@ -2269,7 +2274,8 @@ sfntfont_measure_instructed_pcm (struct sfnt_font_info *font, sfnt_glyph glyph,
                                         font->glyf, font->head,
                                         font->loca_short,
                                         font->loca_long,
-                                        font->interpreter, &metrics);
+                                        font->interpreter, &metrics,
+                                        &font->state);
 
   if (!outline)
     return 1;
@@ -2316,7 +2322,8 @@ sfntfont_measure_pcm (struct sfnt_font_info *font, sfnt_glyph glyph,
                                         &font->outline_cache_size,
                                         font->glyf, font->head,
                                         font->loca_short,
-                                        font->loca_long, NULL, NULL);
+                                        font->loca_long, NULL, NULL,
+                                        NULL);
 
   if (!outline)
     return 1;
@@ -2465,7 +2472,8 @@ sfntfont_draw (struct glyph_string *s, int from, int to,
                                             info->loca_short,
                                             info->loca_long,
                                             info->interpreter,
-                                            &metrics);
+                                            &metrics,
+                                            &info->state);
       x_coords[i - from] = 0;
 
       if (!outline)