[pango/simple-fontmap: 15/16] pango-view: Add a --font-file option

[Matthias Clasen <matthiasc src gnome org>]

commit fd479ce6a43665d8e5aa4468d7e0d6b4b13f1dcb
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Aug 31 07:47:17 2021 -0400

    pango-view: Add a --font-file option
    
    The option can be used multiple times, to create
    a simple fontmap that has exactly the given
    font files, and nothing else.
    
    If the option isn't used, behave as before
    and use a default fontmap.

 utils/viewer-pangocairo.c | 72 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 70 insertions(+), 2 deletions(-)
---
diff --git a/utils/viewer-pangocairo.c b/utils/viewer-pangocairo.c
index 8fe9db59..3b450d94 100644
--- a/utils/viewer-pangocairo.c
+++ b/utils/viewer-pangocairo.c
@@ -25,8 +25,11 @@
 #include "viewer-cairo.h"
 
 #include <pango/pangocairo.h>
+#include <pango/pangofc-fontmap2.h>
 
 static int opt_annotate = 0;
+static const char **opt_font_file = NULL;
+static const char *opt_fontmap = NULL;
 
 typedef struct
 {
@@ -48,8 +51,71 @@ pangocairo_view_create (const PangoViewer *klass G_GNUC_UNUSED)
 
   instance->backend = cairo_viewer_iface_create (&instance->iface);
 
-  instance->fontmap = pango_cairo_font_map_new ();
-  pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (instance->fontmap), opt_dpi);
+  if (g_strcmp0 (opt_fontmap, "fc2") == 0)
+    {
+      instance->fontmap = PANGO_FONT_MAP (pango_fc_font_map2_new ());
+      pango_simple_font_map_set_resolution (PANGO_SIMPLE_FONT_MAP (instance->fontmap), opt_dpi);
+    }
+  else if (g_strcmp0 (opt_fontmap, "simple") == 0)
+    {
+      instance->fontmap = PANGO_FONT_MAP (pango_simple_font_map_new ());
+      pango_simple_font_map_set_resolution (PANGO_SIMPLE_FONT_MAP (instance->fontmap), opt_dpi);
+    }
+  else
+    {
+      instance->fontmap = pango_cairo_font_map_new ();
+      pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (instance->fontmap), opt_dpi);
+    }
+
+  if (opt_font_file != NULL)
+    {
+      PangoFontFamily *fam;
+
+      for (int i = 0; opt_font_file[i]; i++)
+        {
+          if (PANGO_IS_SIMPLE_FONT_MAP (instance->fontmap))
+            pango_simple_font_map_add_file (PANGO_SIMPLE_FONT_MAP (instance->fontmap), opt_font_file[i]);
+        }
+
+      if (g_strcmp0 (opt_fontmap, "simple") == 0)
+        {
+          fam = pango_font_map_get_family (instance->fontmap, "Cantarell");
+          if (fam)
+            {
+              PangoFontFace *face = pango_font_family_get_face (fam, "Regular");
+              PangoHbFace *slanted;
+              PangoMatrix matrix = { 1., -0.2,
+                                     0., 1.,
+                                     0., 0. };
+
+              slanted = pango_hb_face_new_transformed (PANGO_HB_FACE (face), &matrix, "Italic");
+              pango_simple_font_map_add_face (PANGO_SIMPLE_FONT_MAP (instance->fontmap), slanted);
+              g_object_unref (slanted);
+
+              matrix = (PangoMatrix) { 0.5, 0., 0., 1., 0., 0. };
+
+              slanted = pango_hb_face_new_transformed (PANGO_HB_FACE (face), &matrix, "Condensed");
+              pango_simple_font_map_add_face (PANGO_SIMPLE_FONT_MAP (instance->fontmap), slanted);
+              g_object_unref (slanted);
+            }
+
+          fam = pango_font_map_get_family (instance->fontmap, "Liberation Mono");
+          if (fam)
+            {
+              PangoFontFace *face = pango_font_family_get_face (fam, "Regular");
+              PangoHbFace *alias;
+
+              alias = pango_hb_face_new_alias (PANGO_HB_FACE (face), "Monospace");
+              pango_simple_font_map_add_face (PANGO_SIMPLE_FONT_MAP (instance->fontmap), alias);
+              g_object_unref (alias);
+            }
+        }
+    }
+  else
+    {
+      instance->fontmap = pango_cairo_font_map_new ();
+      pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (instance->fontmap), opt_dpi);
+    }
 
   instance->font_options = cairo_font_options_create ();
   if (opt_hinting != HINT_DEFAULT)
@@ -794,6 +860,8 @@ pangocairo_view_get_option_group (const PangoViewer *klass G_GNUC_UNUSED)
   GOptionEntry entries[] =
   {
     {"annotate", 0, 0, G_OPTION_ARG_CALLBACK, parse_annotate_arg, annotate_arg_help, "FLAGS"},
+    {"font-file", 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &opt_font_file, "Font file to use", "FILE"},
+    {"fontmap", 0, 0, G_OPTION_ARG_STRING, &opt_fontmap, "Fontmap to use, default, simple or fc2 ", "NAME"},
     {NULL}
   };
   GOptionGroup *group;