[pango/simple-fontmap: 14/22] Add a PangoFcHbFontMap test

[Matthias Clasen <matthiasc src gnome org>]

commit 56ea1dc92fea78a1334512ae2d1579073954fd3f
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Dec 28 09:35:44 2021 -0500

    Add a PangoFcHbFontMap test

 pango/pangofc-hbfontmap.c | 122 +++++++---------------------------------------
 tests/testhbfont.c        |  47 ++++++++++++++++++
 2 files changed, 64 insertions(+), 105 deletions(-)
---
diff --git a/pango/pangofc-hbfontmap.c b/pango/pangofc-hbfontmap.c
index e0f45570..ccbc25c4 100644
--- a/pango/pangofc-hbfontmap.c
+++ b/pango/pangofc-hbfontmap.c
@@ -70,11 +70,11 @@ find_face_by_file (PangoFcHbFontMap *self,
                    unsigned int      index,
                    int               instance_id)
 {
-  PangoHbFontMap *simple = PANGO_HB_FONT_MAP (self);
+  PangoHbFontMap *map = PANGO_HB_FONT_MAP (self);
 
-  for (int i = 0; i < simple->families->len; i++)
+  for (int i = 0; i < map->families->len; i++)
     {
-      PangoHbFamily *family = g_ptr_array_index (simple->families, i);
+      PangoHbFamily *family = g_ptr_array_index (map->families, i);
 
       for (int j = 0; j < family->faces->len; j++)
         {
@@ -91,7 +91,7 @@ find_face_by_file (PangoFcHbFontMap *self,
 }
 
 /* }}} */
-/* {{{ Fontconfig utilities */ 
+/* {{{ Fontconfig utilities */
 
 static gboolean
 is_supported_font_format (FcPattern *pattern)
@@ -361,9 +361,9 @@ pango_hb_face_from_pattern (FcPattern  *pattern,
 }
 
 static void
-pango_fc_hb_font_map_populate (PangoHbFontMap *simple)
+pango_fc_hb_font_map_populate (PangoHbFontMap *map)
 {
-  PangoFcHbFontMap *self = PANGO_FC_HB_FONT_MAP (simple);
+  PangoFcHbFontMap *self = PANGO_FC_HB_FONT_MAP (map);
   FcPattern *pat;
   FcFontSet *fontset;
   int k;
@@ -399,9 +399,15 @@ pango_fc_hb_font_map_populate (PangoHbFontMap *simple)
 
   FcFontSetDestroy (fontset);
 
-  /* Add alias families */
+  /* Add generic aliases */
   const char *alias_names[] = {
-    "monospace", "sans-serif", "serif", "cursive", "fantasy", "system-ui", "emoji"
+    "monospace",
+    "sans-serif",
+    "serif",
+    "cursive",
+    "fantasy",
+    "system-ui",
+    "emoji"
   };
   FcLangSet *no_langs = FcLangSetCreate ();
   FcLangSet *emoji_langs = FcLangSetCreate ();
@@ -491,101 +497,7 @@ pango_fc_hb_font_map_populate (PangoHbFontMap *simple)
 
   FcObjectSetDestroy (os);
 
-  /* Synthesize missing Bold and Italics */
-  for (int i = 0; i < PANGO_HB_FONT_MAP (self)->families->len; i++)
-    {
-      PangoHbFamily *family = g_ptr_array_index (PANGO_HB_FONT_MAP (self)->families, i);
-      PangoHbFace *regular_face = NULL;
-      int regular_weight = 0;
-      int bold_weight = 1000;
-      gboolean has_italic = FALSE;
-      gboolean has_bold = FALSE;
-      gboolean has_bold_italic = FALSE;
-
-      for (int j = 0; j < g_list_model_get_n_items (G_LIST_MODEL (family)); j++)
-        {
-          PangoFontFace *face = g_list_model_get_item (G_LIST_MODEL (family), j);
-          PangoFontDescription *desc;
-          int weight;
-          PangoStyle style;
-
-          desc = pango_font_face_describe (face);
-          weight = pango_font_description_get_weight (desc);
-          style = pango_font_description_get_style (desc);
-          pango_font_description_free (desc);
-
-          if (style == PANGO_STYLE_NORMAL)
-            {
-              if (abs (weight - (int)PANGO_WEIGHT_NORMAL) < abs (regular_weight - (int)PANGO_WEIGHT_NORMAL))
-                {
-                  regular_weight = weight;
-                  regular_face = PANGO_HB_FACE (face);
-                }
-              if (abs (weight - (int)PANGO_WEIGHT_BOLD) < abs (bold_weight - (int)PANGO_WEIGHT_BOLD))
-                {
-                  bold_weight = weight;
-                  has_bold = TRUE;
-                }
-            }
-          else
-            {
-              if (weight < PANGO_WEIGHT_SEMIBOLD)
-                has_italic = TRUE;
-              else
-                has_bold_italic = TRUE;
-            }
-
-          g_object_unref (face);
-        }
-
-      if (regular_face && !has_italic)
-        {
-          PangoFontDescription *desc;
-          PangoHbFace *face;
-
-          desc = pango_font_description_new ();
-          pango_font_description_set_style (desc, PANGO_STYLE_ITALIC);
-          face = pango_hb_face_new_variant (regular_face,
-                                            &(PangoMatrix) { 1, -0.2, 0, 1, 0, 0 },
-                                            FALSE,
-                                            desc);
-          pango_hb_family_add_face (family, face);
-          g_object_unref (face);
-          pango_font_description_free (desc);
-        }
-
-      if (regular_face && !has_bold)
-        {
-          PangoFontDescription *desc;
-          PangoHbFace *face;
-
-          desc = pango_font_description_new ();
-          pango_font_description_set_weight (desc, PANGO_WEIGHT_BOLD);
-          face = pango_hb_face_new_variant (regular_face, NULL, TRUE, desc);
-          pango_hb_family_add_face (family, face);
-          g_object_unref (face);
-          pango_font_description_free (desc);
-        }
-
-      if (regular_face && !has_bold_italic)
-        {
-          PangoFontDescription *desc;
-          PangoHbFace *face;
-
-          desc = pango_font_description_new ();
-          pango_font_description_set_style (desc, PANGO_STYLE_ITALIC);
-          pango_font_description_set_weight (desc, PANGO_WEIGHT_BOLD);
-          face = pango_hb_face_new_variant (regular_face,
-                                            &(PangoMatrix) { 1, -0.2, 0, 1, 0, 0 },
-                                            TRUE,
-                                            desc);
-          pango_hb_family_add_face (family, face);
-          g_object_unref (face);
-          pango_font_description_free (desc);
-        }
-    }
-
-  pango_trace_mark (before, "populate FcFontMap2", NULL);
+  pango_trace_mark (before, "populate FcHbFontMap", NULL);
 }
 
 /* }}} */
@@ -596,7 +508,7 @@ G_DEFINE_TYPE (PangoFcHbFontMap, pango_fc_hb_font_map, PANGO_TYPE_HB_FONT_MAP)
 static void
 pango_fc_hb_font_map_init (PangoFcHbFontMap *self)
 {
-  pango_hb_font_map_repopulate (PANGO_HB_FONT_MAP (self));
+  pango_hb_font_map_repopulate (PANGO_HB_FONT_MAP (self), TRUE);
 }
 
 static void
@@ -672,7 +584,7 @@ pango_fc_hb_font_map_set_config (PangoFcHbFontMap *self,
   if (self->config)
     FcConfigReference (self->config);
 
-  pango_hb_font_map_repopulate (PANGO_HB_FONT_MAP (self));
+  pango_hb_font_map_repopulate (PANGO_HB_FONT_MAP (self), TRUE);
 }
 
 /* }}} */
diff --git a/tests/testhbfont.c b/tests/testhbfont.c
index 8c956b65..34fba825 100644
--- a/tests/testhbfont.c
+++ b/tests/testhbfont.c
@@ -22,6 +22,7 @@
 #include "config.h"
 #include <glib.h>
 #include <pango/pangocairo.h>
+#include <pango/pangofc-hbfontmap.h>
 
 #ifdef HAVE_CAIRO_FREETYPE
 #include <pango/pango-ot.h>
@@ -222,6 +223,51 @@ test_hbfont_describe (void)
   g_free (path);
 }
 
+/* Verify that pango_fontmap_load_fontset produces a non-empty result
+ * even if the language isn't covered - our itemization code relies
+ * on this.
+ */
+static gboolean
+get_font (PangoFontset *fontset,
+          PangoFont    *font,
+          gpointer      data)
+{
+  gboolean *found = data;
+
+  *found = TRUE;
+
+  return TRUE;
+}
+
+static void
+test_hbfont_language (void)
+{
+  PangoFontMap *map;
+  PangoContext *context;
+  PangoFontDescription *desc;
+  PangoFontset *fonts;
+  gboolean found;
+
+  map = PANGO_FONT_MAP (pango_fc_hb_font_map_new ());
+  context = pango_font_map_create_context (map);
+  desc = pango_font_description_from_string ("serif 11");
+
+  /* zz isn't assigned, so there should not be any fonts claiming to support
+   * this language. We are expecting to get a nonempty fontset regardless.
+   */
+  fonts = pango_font_map_load_fontset (map, context, desc, pango_language_from_string ("zz"));
+  g_assert_true (PANGO_IS_FONTSET (fonts));
+
+  found = FALSE;
+  pango_fontset_foreach (fonts, get_font, &found);
+  g_assert_true (found);
+
+  g_object_unref (fonts);
+  pango_font_description_free (desc);
+  g_object_unref (context);
+  g_object_unref (map);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -231,6 +277,7 @@ main (int argc, char *argv[])
   g_test_add_func ("/hbface/roundtrip", test_hbface_roundtrip);
   g_test_add_func ("/hbfont/roundtrip", test_hbfont_roundtrip);
   g_test_add_func ("/hbfont/describe", test_hbfont_describe);
+  g_test_add_func ("/hbfont/language", test_hbfont_language);
 
   return g_test_run ();
 }