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font chooser: Add examples for font features

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For some font features, we can figure out affected
glyphs, and show before/after. For some others, we
hardcode typical sequences.

Still to do: figure out how to find ligatures and
show them.
This commit is contained in:
Matthias Clasen 2018-04-01 19:35:55 -04:00
parent 63a7d99d25
commit d0e46d257c
1 changed files with 216 additions and 11 deletions
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227
gtk/gtkfontchooserwidget.c
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@ -1836,7 +1836,9 @@ update_language_combo (GtkFontChooserWidget *fontchooser,
typedef struct {
hb_tag_t tag;
const char *name;
GtkWidget *top;
GtkWidget *feat;
GtkWidget *example;
} FeatureItem;
static const char *
@ -1889,6 +1891,180 @@ feat_pressed (GtkGesture *gesture,
set_inconsistent (GTK_CHECK_BUTTON (feat), !inconsistent);
}
static char *
find_affected_text (hb_tag_t feature_tag,
hb_face_t *hb_face,
hb_tag_t script_tag,
hb_tag_t lang_tag,
int max_chars)
{
unsigned int script_index = 0;
unsigned int lang_index = 0;
unsigned int feature_index = 0;
GString *chars;
chars = g_string_new ("");
hb_ot_layout_table_find_script (hb_face, HB_OT_TAG_GSUB, script_tag, &script_index);
hb_ot_layout_script_find_language (hb_face, HB_OT_TAG_GSUB, script_index, lang_tag, &lang_index);
if (hb_ot_layout_language_find_feature (hb_face, HB_OT_TAG_GSUB, script_index, lang_index, feature_tag, &feature_index))
{
unsigned int lookup_indexes[32];
unsigned int lookup_count = 32;
int count;
int n_chars = 0;
count = hb_ot_layout_feature_get_lookups (hb_face,
HB_OT_TAG_GSUB,
feature_index,
0,
&lookup_count,
lookup_indexes);
if (count > 0)
{
hb_set_t* glyphs_before = NULL;
hb_set_t* glyphs_input = NULL;
hb_set_t* glyphs_after = NULL;
hb_set_t* glyphs_output = NULL;
hb_font_t *hb_font = NULL;
hb_codepoint_t gid;
glyphs_input = hb_set_create ();
// XXX For now, just look at first index
hb_ot_layout_lookup_collect_glyphs (hb_face,
HB_OT_TAG_GSUB,
lookup_indexes[0],
glyphs_before,
glyphs_input,
glyphs_after,
glyphs_output);
hb_font = hb_font_create (hb_face);
hb_ft_font_set_funcs (hb_font);
gid = -1;
while (hb_set_next (glyphs_input, &gid)) {
hb_codepoint_t ch;
if (n_chars == max_chars)
{
g_string_append (chars, "…");
break;
}
for (ch = 0; ch < 0xffff; ch++) {
hb_codepoint_t glyph = 0;
hb_font_get_nominal_glyph (hb_font, ch, &glyph);
if (glyph == gid) {
g_string_append_unichar (chars, (gunichar)ch);
n_chars++;
break;
}
}
}
hb_set_destroy (glyphs_input);
hb_font_destroy (hb_font);
}
}
return g_string_free (chars, FALSE);
}
static void
update_feature_example (FeatureItem *item,
hb_face_t *hb_face,
hb_tag_t script_tag,
hb_tag_t lang_tag,
PangoFontDescription *font_desc)
{
const char *letter_case[] = { "smcp", "c2sc", "pcap", "c2pc", "unic", "cpsp", "case", NULL };
const char *number_case[] = { "xxxx", "lnum", "onum", NULL };
const char *number_spacing[] = { "xxxx", "pnum", "tnum", NULL };
const char *number_formatting[] = { "zero", "nalt", NULL };
const char *char_variants[] = {
"swsh", "cswh", "calt", "falt", "hist", "salt", "jalt", "titl", "rand",
"ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "ss07", "ss08", "ss09", "ss10",
"ss11", "ss12", "ss13", "ss14", "ss15", "ss16", "ss17", "ss18", "ss19", "ss20",
NULL };
if (g_strv_contains (number_case, item->name) ||
g_strv_contains (number_spacing, item->name))
{
PangoAttrList *attrs;
PangoAttribute *attr;
PangoFontDescription *desc;
char *str;
attrs = pango_attr_list_new ();
desc = pango_font_description_copy (font_desc);
pango_font_description_unset_fields (desc, PANGO_FONT_MASK_SIZE);
pango_attr_list_insert (attrs, pango_attr_font_desc_new (desc));
pango_font_description_free (desc);
str = g_strconcat (item->name, " 1", NULL);
attr = pango_attr_font_features_new (str);
pango_attr_list_insert (attrs, attr);
gtk_label_set_text (GTK_LABEL (item->example), "0123456789");
gtk_label_set_attributes (GTK_LABEL (item->example), attrs);
pango_attr_list_unref (attrs);
}
else if (g_strv_contains (letter_case, item->name) ||
g_strv_contains (number_formatting, item->name) ||
g_strv_contains (char_variants, item->name))
{
char *input = NULL;
char *text;
if (strcmp (item->name, "case") == 0)
input = g_strdup ("A-B[Cq]");
else if (g_strv_contains (letter_case, item->name))
input = g_strdup ("AaBbCc…");
else if (strcmp (item->name, "zero") == 0)
input = g_strdup ("0");
else if (strcmp (item->name, "nalt") == 0)
input = find_affected_text (item->tag, hb_face, script_tag, lang_tag, 3);
else
input = find_affected_text (item->tag, hb_face, script_tag, lang_tag, 10);
if (input[0] != '\0')
{
PangoAttrList *attrs;
PangoAttribute *attr;
PangoFontDescription *desc;
char *str;
text = g_strconcat (input, " ⟶ ", input, NULL);
attrs = pango_attr_list_new ();
desc = pango_font_description_copy (font_desc);
pango_font_description_unset_fields (desc, PANGO_FONT_MASK_SIZE);
pango_attr_list_insert (attrs, pango_attr_font_desc_new (desc));
pango_font_description_free (desc);
str = g_strconcat (item->name, " 0", NULL);
attr = pango_attr_font_features_new (str);
attr->start_index = 0;
attr->end_index = strlen (input);
pango_attr_list_insert (attrs, attr);
str = g_strconcat (item->name, " 1", NULL);
attr = pango_attr_font_features_new (str);
attr->start_index = strlen (input) + strlen (" ⟶ ");
attr->end_index = attr->start_index + strlen (input);
pango_attr_list_insert (attrs, attr);
gtk_label_set_text (GTK_LABEL (item->example), text);
gtk_label_set_attributes (GTK_LABEL (item->example), attrs);
g_free (text);
pango_attr_list_unref (attrs);
}
else
gtk_label_set_markup (GTK_LABEL (item->example), "");
g_free (input);
}
}
static void
add_check_group (GtkFontChooserWidget *fontchooser,
const char *title,
@ -1901,7 +2077,7 @@ add_check_group (GtkFontChooserWidget *fontchooser,
int i;
group = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_widget_set_halign (group, GTK_ALIGN_START);
gtk_widget_set_halign (group, GTK_ALIGN_FILL);
label = gtk_label_new (title);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
@ -1919,12 +2095,13 @@ add_check_group (GtkFontChooserWidget *fontchooser,
GtkWidget *feat;
FeatureItem *item;
GtkGesture *gesture;
GtkWidget *box;
GtkWidget *example;
tag = hb_tag_from_string (tags[i], -1);
feat = gtk_check_button_new_with_label (get_feature_display_name (tag));
set_inconsistent (GTK_CHECK_BUTTON (feat), TRUE);
g_signal_connect_swapped (feat, "notify::active", G_CALLBACK (update_font_features), fontchooser);
g_signal_connect_swapped (feat, "notify::inconsistent", G_CALLBACK (update_font_features), fontchooser);
g_signal_connect (feat, "clicked", G_CALLBACK (feat_clicked), NULL);
@ -1935,12 +2112,22 @@ add_check_group (GtkFontChooserWidget *fontchooser,
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
g_signal_connect (gesture, "pressed", G_CALLBACK (feat_pressed), feat);
gtk_container_add (GTK_CONTAINER (group), feat);
example = gtk_label_new ("");
gtk_label_set_selectable (GTK_LABEL (example), TRUE);
gtk_widget_set_halign (example, GTK_ALIGN_START);
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
gtk_box_set_homogeneous (GTK_BOX (box), TRUE);
gtk_container_add (GTK_CONTAINER (box), feat);
gtk_container_add (GTK_CONTAINER (box), example);
gtk_container_add (GTK_CONTAINER (group), box);
item = g_new (FeatureItem, 1);
item->name = tags[i];
item->tag = tag;
item->top = box;
item->feat = feat;
item->example = example;
priv->feature_items = g_list_prepend (priv->feature_items, item);
}
@ -1961,7 +2148,7 @@ add_radio_group (GtkFontChooserWidget *fontchooser,
PangoAttrList *attrs;
group = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_widget_set_halign (group, GTK_ALIGN_START);
gtk_widget_set_halign (group, GTK_ALIGN_FILL);
label = gtk_label_new (title);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
@ -1979,6 +2166,8 @@ add_radio_group (GtkFontChooserWidget *fontchooser,
GtkWidget *feat;
FeatureItem *item;
const char *name;
GtkWidget *box;
GtkWidget *example;
tag = hb_tag_from_string (tags[i], -1);
name = get_feature_display_name (tag);
@ -1991,12 +2180,22 @@ add_radio_group (GtkFontChooserWidget *fontchooser,
g_signal_connect_swapped (feat, "notify::active", G_CALLBACK (update_font_features), fontchooser);
g_object_set_data (G_OBJECT (feat), "default", group_button);
gtk_container_add (GTK_CONTAINER (group), feat);
example = gtk_label_new ("");
gtk_label_set_selectable (GTK_LABEL (example), TRUE);
gtk_widget_set_halign (example, GTK_ALIGN_START);
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
gtk_box_set_homogeneous (GTK_BOX (box), TRUE);
gtk_container_add (GTK_CONTAINER (box), feat);
gtk_container_add (GTK_CONTAINER (box), example);
gtk_container_add (GTK_CONTAINER (group), box);
item = g_new (FeatureItem, 1);
item->name = tags[i];
item->tag = tag;
item->top = box;
item->feat = feat;
item->example = example;
priv->feature_items = g_list_prepend (priv->feature_items, item);
}
@ -2012,7 +2211,11 @@ gtk_font_chooser_widget_populate_features (GtkFontChooserWidget *fontchooser)
const char *number_case[] = { "xxxx", "lnum", "onum", NULL };
const char *number_spacing[] = { "xxxx", "pnum", "tnum", NULL };
const char *number_formatting[] = { "zero", "nalt", NULL };
const char *char_variants[] = { "swsh", "cswh", "calt", "falt", "hist", "salt", "jalt", "titl", "rand", NULL };
const char *char_variants[] = {
"swsh", "cswh", "calt", "falt", "hist", "salt", "jalt", "titl", "rand",
"ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "ss07", "ss08", "ss09", "ss10",
"ss11", "ss12", "ss13", "ss14", "ss15", "ss16", "ss17", "ss18", "ss19", "ss20",
NULL };
add_check_group (fontchooser, _("Ligatures"), ligatures);
add_check_group (fontchooser, _("Letter Case"), letter_case);
@ -2044,8 +2247,8 @@ gtk_font_chooser_widget_update_font_features (GtkFontChooserWidget *fontchooser)
for (l = priv->feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
gtk_widget_hide (item->feat);
gtk_widget_hide (gtk_widget_get_parent (item->feat));
gtk_widget_hide (item->top);
gtk_widget_hide (gtk_widget_get_parent (item->top));
}
if ((priv->level & GTK_FONT_CHOOSER_LEVEL_FEATURES) == 0)
@ -2093,14 +2296,16 @@ gtk_font_chooser_widget_update_font_features (GtkFontChooserWidget *fontchooser)
continue;
has_feature = TRUE;
gtk_widget_show (item->feat);
gtk_widget_show (gtk_widget_get_parent (item->feat));
gtk_widget_show (item->top);
gtk_widget_show (gtk_widget_get_parent (item->top));
gtk_widget_show (priv->feature_language_combo);
update_feature_example (item, hb_face, script_tag, lang_tag, priv->font_desc);
if (GTK_IS_RADIO_BUTTON (item->feat))
{
GtkWidget *def = GTK_WIDGET (g_object_get_data (G_OBJECT (item->feat), "default"));
gtk_widget_show (def);
gtk_widget_show (gtk_widget_get_parent (def));
}
else if (GTK_IS_CHECK_BUTTON (item->feat))
{