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gtk2/demos/gtk-demo/font_features.c
Chun-wei Fan efb875daef demos: Mark non-static signal handler symbols for export 
The symbols in the .ui files for the signal handlers and functions must be
exported so that the system can pick them up during execution.

Fixes #3918.
2021-05-07 10:38:02 +08:00

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/* Pango/Font Explorer
*
* This example demonstrates support for OpenType font features with
* Pango attributes. The attributes can be used manually or via Pango
* markup.
*
* It can also be used to explore available features in OpenType fonts
* and their effect.
*
* If the selected font supports OpenType font variations, then the
* axes are also offered for customization.
*/
#include <gtk/gtk.h>
#include <pango/pangofc-font.h>
#include <hb.h>
#include <hb-ot.h>
#include <glib/gi18n.h>
#include "open-type-layout.h"
#include "fontplane.h"
#include "script-names.h"
#include "language-names.h"
#define MAKE_TAG(a,b,c,d) (unsigned int)(((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
static GtkWidget *the_label;
static GtkWidget *settings;
static GtkWidget *description;
static GtkWidget *font;
static GtkWidget *script_lang;
static GtkWidget *resetbutton;
static GtkWidget *stack;
static GtkWidget *the_entry;
static GtkWidget *variations_heading;
static GtkWidget *variations_grid;
static GtkWidget *instance_combo;
static GtkWidget *edit_toggle;
typedef struct {
unsigned int tag;
const char *name;
GtkWidget *icon;
GtkWidget *dflt;
GtkWidget *feat;
} FeatureItem;
static GList *feature_items;
typedef struct {
unsigned int start;
unsigned int end;
PangoFontDescription *desc;
char *features;
PangoLanguage *language;
} Range;
static GList *ranges;
static void add_font_variations (GString *s);
static void
free_range (gpointer data)
{
Range *range = data;
if (range->desc)
pango_font_description_free (range->desc);
g_free (range->features);
g_free (range);
}
static int
compare_range (gconstpointer a, gconstpointer b)
{
const Range *ra = a;
const Range *rb = b;
if (ra->start < rb->start)
return -1;
else if (ra->start > rb->start)
return 1;
else if (ra->end < rb->end)
return 1;
else if (ra->end > rb->end)
return -1;
return 0;
}
static void
ensure_range (unsigned int start,
unsigned int end,
PangoFontDescription *desc,
const char *features,
PangoLanguage *language)
{
GList *l;
Range *range;
for (l = ranges; l; l = l->next)
{
Range *r = l->data;
if (r->start == start && r->end == end)
{
range = r;
goto set;
}
}
range = g_new0 (Range, 1);
range->start = start;
range->end = end;
ranges = g_list_insert_sorted (ranges, range, compare_range);
set:
if (range->desc)
pango_font_description_free (range->desc);
if (desc)
range->desc = pango_font_description_copy (desc);
g_free (range->features);
range->features = g_strdup (features);
range->language = language;
}
static const char *
get_feature_display_name (unsigned int tag)
{
int i;
static char buf[5] = { 0, };
if (tag == MAKE_TAG ('x', 'x', 'x', 'x'))
return _("Default");
for (i = 0; i < G_N_ELEMENTS (open_type_layout_features); i++)
{
if (tag == open_type_layout_features[i].tag)
return g_dpgettext2 (NULL, "OpenType layout", open_type_layout_features[i].name);
}
hb_tag_to_string (tag, buf);
g_warning ("unknown OpenType layout feature tag: %s", buf);
return buf;
}
static void update_display (void);
static void
set_inconsistent (GtkCheckButton *button,
gboolean inconsistent)
{
gtk_check_button_set_inconsistent (GTK_CHECK_BUTTON (button), inconsistent);
gtk_widget_set_opacity (gtk_widget_get_first_child (GTK_WIDGET (button)), inconsistent ? 0.0 : 1.0);
}
static void
feat_pressed (GtkGestureClick *gesture,
int n_press,
double x,
double y,
GtkWidget *feat)
{
const guint button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
if (button == GDK_BUTTON_PRIMARY)
{
g_signal_handlers_block_by_func (feat, feat_pressed, NULL);
if (gtk_check_button_get_inconsistent (GTK_CHECK_BUTTON (feat)))
{
set_inconsistent (GTK_CHECK_BUTTON (feat), FALSE);
gtk_check_button_set_active (GTK_CHECK_BUTTON (feat), TRUE);
}
g_signal_handlers_unblock_by_func (feat, feat_pressed, NULL);
}
else if (button == GDK_BUTTON_SECONDARY)
{
gboolean inconsistent = gtk_check_button_get_inconsistent (GTK_CHECK_BUTTON (feat));
set_inconsistent (GTK_CHECK_BUTTON (feat), !inconsistent);
}
}
static void
feat_toggled_cb (GtkCheckButton *check_button,
gpointer data)
{
set_inconsistent (check_button, FALSE);
}
static void
add_check_group (GtkWidget *box,
const char *title,
const char **tags)
{
GtkWidget *label;
GtkWidget *group;
PangoAttrList *attrs;
int i;
group = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_widget_set_halign (group, GTK_ALIGN_START);
label = gtk_label_new (title);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_widget_set_halign (label, GTK_ALIGN_START);
g_object_set (label, "margin-top", 10, "margin-bottom", 10, NULL);
attrs = pango_attr_list_new ();
pango_attr_list_insert (attrs, pango_attr_weight_new (PANGO_WEIGHT_BOLD));
gtk_label_set_attributes (GTK_LABEL (label), attrs);
pango_attr_list_unref (attrs);
gtk_box_append (GTK_BOX (group), label);
for (i = 0; tags[i]; i++)
{
unsigned int tag;
GtkWidget *feat;
FeatureItem *item;
GtkGesture *gesture;
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 (feat, "notify::active", G_CALLBACK (update_display), NULL);
g_signal_connect (feat, "notify::inconsistent", G_CALLBACK (update_display), NULL);
g_signal_connect (feat, "toggled", G_CALLBACK (feat_toggled_cb), NULL);
gesture = gtk_gesture_click_new ();
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
g_signal_connect (gesture, "pressed", G_CALLBACK (feat_pressed), feat);
gtk_widget_add_controller (feat, GTK_EVENT_CONTROLLER (gesture));
gtk_box_append (GTK_BOX (group), feat);
item = g_new (FeatureItem, 1);
item->name = tags[i];
item->tag = tag;
item->icon = NULL;
item->dflt = NULL;
item->feat = feat;
feature_items = g_list_prepend (feature_items, item);
}
gtk_box_append (GTK_BOX (box), group);
}
static void
add_radio_group (GtkWidget *box,
const char *title,
const char **tags)
{
GtkWidget *label;
GtkWidget *group;
int i;
GtkWidget *group_button = NULL;
PangoAttrList *attrs;
group = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_widget_set_halign (group, GTK_ALIGN_START);
label = gtk_label_new (title);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_widget_set_halign (label, GTK_ALIGN_START);
g_object_set (label, "margin-top", 10, "margin-bottom", 10, NULL);
attrs = pango_attr_list_new ();
pango_attr_list_insert (attrs, pango_attr_weight_new (PANGO_WEIGHT_BOLD));
gtk_label_set_attributes (GTK_LABEL (label), attrs);
pango_attr_list_unref (attrs);
gtk_box_append (GTK_BOX (group), label);
for (i = 0; tags[i]; i++)
{
unsigned int tag;
GtkWidget *feat;
FeatureItem *item;
const char *name;
tag = hb_tag_from_string (tags[i], -1);
name = get_feature_display_name (tag);
feat = gtk_check_button_new_with_label (name ? name : _("Default"));
if (group_button == NULL)
group_button = feat;
else
gtk_check_button_set_group (GTK_CHECK_BUTTON (feat), GTK_CHECK_BUTTON (group_button));
g_signal_connect (feat, "notify::active", G_CALLBACK (update_display), NULL);
g_object_set_data (G_OBJECT (feat), "default", group_button);
gtk_box_append (GTK_BOX (group), feat);
item = g_new (FeatureItem, 1);
item->name = tags[i];
item->tag = tag;
item->icon = NULL;
item->dflt = NULL;
item->feat = feat;
feature_items = g_list_prepend (feature_items, item);
}
gtk_box_append (GTK_BOX (box), group);
}
static void
update_display (void)
{
GString *s;
const char *text;
gboolean has_feature;
GtkTreeIter iter;
GtkTreeModel *model;
PangoFontDescription *desc;
GList *l;
PangoAttrList *attrs;
PangoAttribute *attr;
int ins, bound;
guint start, end;
PangoLanguage *lang;
char *font_desc;
char *features;
text = gtk_editable_get_text (GTK_EDITABLE (the_entry));
if (gtk_label_get_selection_bounds (GTK_LABEL (the_label), &ins, &bound))
{
start = g_utf8_offset_to_pointer (text, ins) - text;
end = g_utf8_offset_to_pointer (text, bound) - text;
}
else
{
start = PANGO_ATTR_INDEX_FROM_TEXT_BEGINNING;
end = PANGO_ATTR_INDEX_TO_TEXT_END;
}
desc = gtk_font_chooser_get_font_desc (GTK_FONT_CHOOSER (font));
s = g_string_new ("");
add_font_variations (s);
if (s->len > 0)
{
pango_font_description_set_variations (desc, s->str);
g_string_free (s, TRUE);
}
font_desc = pango_font_description_to_string (desc);
s = g_string_new ("");
has_feature = FALSE;
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
if (!gtk_widget_is_sensitive (item->feat))
continue;
if (GTK_IS_CHECK_BUTTON (item->feat))
{
if (g_object_get_data (G_OBJECT (item->feat), "default"))
{
if (gtk_check_button_get_active (GTK_CHECK_BUTTON (item->feat)) &&
strcmp (item->name, "xxxx") != 0)
{
if (has_feature)
g_string_append (s, ", ");
g_string_append (s, item->name);
g_string_append (s, " 1");
has_feature = TRUE;
}
}
else
{
if (gtk_check_button_get_inconsistent (GTK_CHECK_BUTTON (item->feat)))
continue;
if (has_feature)
g_string_append (s, ", ");
g_string_append (s, item->name);
if (gtk_check_button_get_active (GTK_CHECK_BUTTON (item->feat)))
g_string_append (s, " 1");
else
g_string_append (s, " 0");
has_feature = TRUE;
}
}
}
features = g_string_free (s, FALSE);
if (gtk_combo_box_get_active_iter (GTK_COMBO_BOX (script_lang), &iter))
{
hb_tag_t lang_tag;
model = gtk_combo_box_get_model (GTK_COMBO_BOX (script_lang));
gtk_tree_model_get (model, &iter,
3, &lang_tag,
-1);
lang = pango_language_from_string (hb_language_to_string (hb_ot_tag_to_language (lang_tag)));
}
else
lang = NULL;
ensure_range (start, end, desc, features, lang);
attrs = pango_attr_list_new ();
for (l = ranges; l; l = l->next)
{
Range *range = l->data;
attr = pango_attr_font_desc_new (range->desc);
attr->start_index = range->start;
attr->end_index = range->end;
pango_attr_list_insert (attrs, attr);
attr = pango_attr_font_features_new (range->features);
attr->start_index = range->start;
attr->end_index = range->end;
pango_attr_list_insert (attrs, attr);
if (range->language)
{
attr = pango_attr_language_new (range->language);
attr->start_index = range->start;
attr->end_index = range->end;
pango_attr_list_insert (attrs, attr);
}
}
gtk_label_set_text (GTK_LABEL (description), font_desc);
gtk_label_set_text (GTK_LABEL (settings), features);
gtk_label_set_text (GTK_LABEL (the_label), text);
gtk_label_set_attributes (GTK_LABEL (the_label), attrs);
g_free (font_desc);
pango_font_description_free (desc);
g_free (features);
pango_attr_list_unref (attrs);
}
static PangoFont *
get_pango_font (void)
{
PangoFontDescription *desc;
PangoContext *context;
desc = gtk_font_chooser_get_font_desc (GTK_FONT_CHOOSER (font));
context = gtk_widget_get_pango_context (font);
return pango_context_load_font (context, desc);
}
typedef struct {
hb_tag_t script_tag;
hb_tag_t lang_tag;
unsigned int script_index;
unsigned int lang_index;
} TagPair;
static guint
tag_pair_hash (gconstpointer data)
{
const TagPair *pair = data;
return pair->script_tag + pair->lang_tag;
}
static gboolean
tag_pair_equal (gconstpointer a, gconstpointer b)
{
const TagPair *pair_a = a;
const TagPair *pair_b = b;
return pair_a->script_tag == pair_b->script_tag && pair_a->lang_tag == pair_b->lang_tag;
}
static int
script_sort_func (GtkTreeModel *model,
GtkTreeIter *a,
GtkTreeIter *b,
gpointer user_data)
{
char *sa, *sb;
int ret;
gtk_tree_model_get (model, a, 0, &sa, -1);
gtk_tree_model_get (model, b, 0, &sb, -1);
ret = strcmp (sa, sb);
g_free (sa);
g_free (sb);
return ret;
}
static void
update_script_combo (void)
{
GtkListStore *store;
hb_font_t *hb_font;
int i, j, k;
PangoFont *pango_font;
GHashTable *tags;
GHashTableIter iter;
TagPair *pair;
char *lang;
hb_tag_t active;
GtkTreeIter active_iter;
gboolean have_active = FALSE;
lang = gtk_font_chooser_get_language (GTK_FONT_CHOOSER (font));
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
active = hb_ot_tag_from_language (hb_language_from_string (lang, -1));
G_GNUC_END_IGNORE_DEPRECATIONS
g_free (lang);
store = gtk_list_store_new (4, G_TYPE_STRING, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_UINT);
pango_font = get_pango_font ();
hb_font = pango_font_get_hb_font (pango_font);
tags = g_hash_table_new_full (tag_pair_hash, tag_pair_equal, g_free, NULL);
pair = g_new (TagPair, 1);
pair->script_tag = HB_OT_TAG_DEFAULT_SCRIPT;
pair->lang_tag = HB_OT_TAG_DEFAULT_LANGUAGE;
g_hash_table_add (tags, pair);
if (hb_font)
{
hb_tag_t tables[2] = { HB_OT_TAG_GSUB, HB_OT_TAG_GPOS };
hb_face_t *hb_face;
hb_face = hb_font_get_face (hb_font);
for (i= 0; i < 2; i++)
{
hb_tag_t scripts[80];
unsigned int script_count = G_N_ELEMENTS (scripts);
hb_ot_layout_table_get_script_tags (hb_face, tables[i], 0, &script_count, scripts);
for (j = 0; j < script_count; j++)
{
hb_tag_t languages[80];
unsigned int language_count = G_N_ELEMENTS (languages);
hb_ot_layout_script_get_language_tags (hb_face, tables[i], j, 0, &language_count, languages);
for (k = 0; k < language_count; k++)
{
pair = g_new (TagPair, 1);
pair->script_tag = scripts[j];
pair->lang_tag = languages[k];
pair->script_index = j;
pair->lang_index = k;
g_hash_table_add (tags, pair);
}
}
}
}
g_object_unref (pango_font);
g_hash_table_iter_init (&iter, tags);
while (g_hash_table_iter_next (&iter, (gpointer *)&pair, NULL))
{
const char *langname;
char langbuf[5];
GtkTreeIter tree_iter;
if (pair->lang_tag == HB_OT_TAG_DEFAULT_LANGUAGE)
langname = NC_("Language", "Default");
else
{
langname = get_language_name_for_tag (pair->lang_tag);
if (!langname)
{
hb_tag_to_string (pair->lang_tag, langbuf);
langbuf[4] = 0;
langname = langbuf;
}
}
gtk_list_store_insert_with_values (store, &tree_iter, -1,
0, langname,
1, pair->script_index,
2, pair->lang_index,
3, pair->lang_tag,
-1);
if (pair->lang_tag == active)
{
have_active = TRUE;
active_iter = tree_iter;
}
}
g_hash_table_destroy (tags);
gtk_tree_sortable_set_default_sort_func (GTK_TREE_SORTABLE (store),
script_sort_func, NULL, NULL);
gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (store),
GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID,
GTK_SORT_ASCENDING);
gtk_combo_box_set_model (GTK_COMBO_BOX (script_lang), GTK_TREE_MODEL (store));
if (have_active)
gtk_combo_box_set_active_iter (GTK_COMBO_BOX (script_lang), &active_iter);
else
gtk_combo_box_set_active_iter (GTK_COMBO_BOX (script_lang), 0);
}
static void
update_features (void)
{
int i, j;
GtkTreeModel *model;
GtkTreeIter iter;
guint script_index, lang_index;
PangoFont *pango_font;
hb_font_t *hb_font;
GList *l;
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
gtk_widget_hide (item->feat);
gtk_widget_hide (gtk_widget_get_parent (item->feat));
if (strcmp (item->name, "xxxx") == 0)
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), TRUE);
}
/* set feature presence checks from the font features */
if (!gtk_combo_box_get_active_iter (GTK_COMBO_BOX (script_lang), &iter))
return;
model = gtk_combo_box_get_model (GTK_COMBO_BOX (script_lang));
gtk_tree_model_get (model, &iter,
1, &script_index,
2, &lang_index,
-1);
pango_font = get_pango_font ();
hb_font = pango_font_get_hb_font (pango_font);
if (hb_font)
{
hb_tag_t tables[2] = { HB_OT_TAG_GSUB, HB_OT_TAG_GPOS };
hb_face_t *hb_face;
char *feat;
hb_face = hb_font_get_face (hb_font);
for (i = 0; i < 2; i++)
{
hb_tag_t features[80];
unsigned int count = G_N_ELEMENTS(features);
hb_ot_layout_language_get_feature_tags (hb_face,
tables[i],
script_index,
lang_index,
0,
&count,
features);
for (j = 0; j < count; j++)
{
#if 0
char buf[5];
hb_tag_to_string (features[j], buf);
buf[4] = 0;
g_print ("%s present in %s\n", buf, i == 0 ? "GSUB" : "GPOS");
#endif
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
if (item->tag == features[j])
{
gtk_widget_show (item->feat);
gtk_widget_show (gtk_widget_get_parent (item->feat));
if (GTK_IS_CHECK_BUTTON (item->feat))
{
GtkWidget *def = GTK_WIDGET (g_object_get_data (G_OBJECT (item->feat), "default"));
if (def)
{
gtk_widget_show (def);
gtk_widget_show (gtk_widget_get_parent (def));
gtk_check_button_set_active (GTK_CHECK_BUTTON (def), TRUE);
}
else
set_inconsistent (GTK_CHECK_BUTTON (item->feat), TRUE);
}
}
}
}
}
feat = gtk_font_chooser_get_font_features (GTK_FONT_CHOOSER (font));
if (feat)
{
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
char buf[5];
char *p;
hb_tag_to_string (item->tag, buf);
buf[4] = 0;
p = strstr (feat, buf);
if (p)
{
if (GTK_IS_CHECK_BUTTON (item->feat) && g_object_get_data (G_OBJECT (item->feat), "default"))
{
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), p[6] == '1');
}
else if (GTK_IS_CHECK_BUTTON (item->feat))
{
set_inconsistent (GTK_CHECK_BUTTON (item->feat), FALSE);
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), p[6] == '1');
}
}
}
g_free (feat);
}
}
g_object_unref (pango_font);
}
#define FixedToFloat(f) (((float)(f))/65536.0)
static void
adjustment_changed (GtkAdjustment *adjustment,
GtkEntry *entry)
{
char *str;
str = g_strdup_printf ("%g", gtk_adjustment_get_value (adjustment));
gtk_editable_set_text (GTK_EDITABLE (entry), str);
g_free (str);
update_display ();
}
static void
entry_activated (GtkEntry *entry,
GtkAdjustment *adjustment)
{
double value;
char *err = NULL;
value = g_strtod (gtk_editable_get_text (GTK_EDITABLE (entry)), &err);
if (err != NULL)
gtk_adjustment_set_value (adjustment, value);
}
static void unset_instance (GtkAdjustment *adjustment);
typedef struct {
guint32 tag;
GtkAdjustment *adjustment;
} Axis;
static GHashTable *axes;
static void
add_font_variations (GString *s)
{
GHashTableIter iter;
Axis *axis;
char buf[G_ASCII_DTOSTR_BUF_SIZE];
const char *sep = "";
g_hash_table_iter_init (&iter, axes);
while (g_hash_table_iter_next (&iter, (gpointer *)NULL, (gpointer *)&axis))
{
char tag[5];
double value;
hb_tag_to_string (axis->tag, tag);
tag[4] = '\0';
value = gtk_adjustment_get_value (axis->adjustment);
g_string_append_printf (s, "%s%s=%s", sep, tag, g_ascii_dtostr (buf, sizeof (buf), value));
sep = ",";
}
}
static guint
axes_hash (gconstpointer v)
{
const Axis *p = v;
return p->tag;
}
static gboolean
axes_equal (gconstpointer v1, gconstpointer v2)
{
const Axis *p1 = v1;
const Axis *p2 = v2;
return p1->tag == p2->tag;
}
static void
add_axis (hb_face_t *hb_face,
hb_ot_var_axis_info_t *ax,
float value,
int i)
{
GtkWidget *axis_label;
GtkWidget *axis_entry;
GtkWidget *axis_scale;
GtkAdjustment *adjustment;
Axis *axis;
char name[20];
unsigned int name_len = 20;
hb_ot_name_get_utf8 (hb_face, ax->name_id, HB_LANGUAGE_INVALID, &name_len, name);
axis_label = gtk_label_new (name);
gtk_widget_set_halign (axis_label, GTK_ALIGN_START);
gtk_widget_set_valign (axis_label, GTK_ALIGN_BASELINE);
gtk_grid_attach (GTK_GRID (variations_grid), axis_label, 0, i, 1, 1);
adjustment = gtk_adjustment_new (value, ax->min_value, ax->max_value,
1.0, 10.0, 0.0);
axis_scale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, adjustment);
gtk_scale_add_mark (GTK_SCALE (axis_scale), ax->default_value, GTK_POS_TOP, NULL);
gtk_widget_set_valign (axis_scale, GTK_ALIGN_BASELINE);
gtk_widget_set_hexpand (axis_scale, TRUE);
gtk_widget_set_size_request (axis_scale, 100, -1);
gtk_scale_set_draw_value (GTK_SCALE (axis_scale), FALSE);
gtk_grid_attach (GTK_GRID (variations_grid), axis_scale, 1, i, 1, 1);
axis_entry = gtk_entry_new ();
gtk_widget_set_valign (axis_entry, GTK_ALIGN_BASELINE);
gtk_editable_set_width_chars (GTK_EDITABLE (axis_entry), 4);
gtk_grid_attach (GTK_GRID (variations_grid), axis_entry, 2, i, 1, 1);
axis = g_new (Axis, 1);
axis->tag = ax->tag;
axis->adjustment = adjustment;
g_hash_table_add (axes, axis);
adjustment_changed (adjustment, GTK_ENTRY (axis_entry));
g_signal_connect (adjustment, "value-changed", G_CALLBACK (adjustment_changed), axis_entry);
g_signal_connect (adjustment, "value-changed", G_CALLBACK (unset_instance), NULL);
g_signal_connect (axis_entry, "activate", G_CALLBACK (entry_activated), adjustment);
}
typedef struct {
char *name;
unsigned int index;
} Instance;
static guint
instance_hash (gconstpointer v)
{
const Instance *p = v;
return g_str_hash (p->name);
}
static gboolean
instance_equal (gconstpointer v1, gconstpointer v2)
{
const Instance *p1 = v1;
const Instance *p2 = v2;
return g_str_equal (p1->name, p2->name);
}
static void
free_instance (gpointer data)
{
Instance *instance = data;
g_free (instance->name);
g_free (instance);
}
static GHashTable *instances;
static void
add_instance (hb_face_t *face,
unsigned int index,
GtkWidget *combo,
int pos)
{
Instance *instance;
hb_ot_name_id_t name_id;
char name[20];
unsigned int name_len = 20;
instance = g_new0 (Instance, 1);
name_id = hb_ot_var_named_instance_get_subfamily_name_id (face, index);
hb_ot_name_get_utf8 (face, name_id, HB_LANGUAGE_INVALID, &name_len, name);
instance->name = g_strdup (name);
instance->index = index;
g_hash_table_add (instances, instance);
gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), instance->name);
}
static void
unset_instance (GtkAdjustment *adjustment)
{
if (instance_combo)
gtk_combo_box_set_active (GTK_COMBO_BOX (instance_combo), 0);
}
static void
instance_changed (GtkComboBox *combo)
{
char *text;
Instance *instance;
Instance ikey;
int i;
unsigned int coords_length;
float *coords = NULL;
hb_ot_var_axis_info_t *ai = NULL;
unsigned int n_axes;
PangoFont *pango_font = NULL;
hb_font_t *hb_font;
hb_face_t *hb_face;
text = gtk_combo_box_text_get_active_text (GTK_COMBO_BOX_TEXT (combo));
if (text[0] == '\0')
goto out;
ikey.name = text;
instance = g_hash_table_lookup (instances, &ikey);
if (!instance)
{
g_print ("did not find instance %s\n", text);
goto out;
}
pango_font = get_pango_font ();
hb_font = pango_font_get_hb_font (pango_font);
hb_face = hb_font_get_face (hb_font);
n_axes = hb_ot_var_get_axis_infos (hb_face, 0, NULL, NULL);
ai = g_new (hb_ot_var_axis_info_t, n_axes);
hb_ot_var_get_axis_infos (hb_face, 0, &n_axes, ai);
coords = g_new (float, n_axes);
hb_ot_var_named_instance_get_design_coords (hb_face,
instance->index,
&coords_length,
coords);
for (i = 0; i < n_axes; i++)
{
Axis *axis;
Axis akey;
double value;
value = coords[ai[i].axis_index];
akey.tag = ai[i].tag;
axis = g_hash_table_lookup (axes, &akey);
if (axis)
{
g_signal_handlers_block_by_func (axis->adjustment, unset_instance, NULL);
gtk_adjustment_set_value (axis->adjustment, value);
g_signal_handlers_unblock_by_func (axis->adjustment, unset_instance, NULL);
}
}
out:
g_free (text);
g_clear_object (&pango_font);
g_free (ai);
g_free (coords);
}
static gboolean
matches_instance (hb_face_t *hb_face,
unsigned int index,
unsigned int n_axes,
float *coords)
{
float *instance_coords;
unsigned int coords_length;
int i;
instance_coords = g_new (float, n_axes);
coords_length = n_axes;
hb_ot_var_named_instance_get_design_coords (hb_face,
index,
&coords_length,
instance_coords);
for (i = 0; i < n_axes; i++)
if (instance_coords[i] != coords[i])
return FALSE;
return TRUE;
}
static void
add_font_plane (int i)
{
GtkWidget *plane;
Axis *weight_axis;
Axis *width_axis;
Axis key;
key.tag = MAKE_TAG('w','g','h','t');
weight_axis = g_hash_table_lookup (axes, &key);
key.tag = MAKE_TAG('w','d','t','h');
width_axis = g_hash_table_lookup (axes, &key);
if (weight_axis && width_axis)
{
plane = gtk_font_plane_new (weight_axis->adjustment,
width_axis->adjustment);
gtk_widget_set_size_request (plane, 300, 300);
gtk_widget_set_halign (plane, GTK_ALIGN_CENTER);
gtk_grid_attach (GTK_GRID (variations_grid), plane, 0, i, 3, 1);
}
}
/* FIXME: This doesn't work if the font has an avar table */
static float
denorm_coord (hb_ot_var_axis_info_t *axis, int coord)
{
float r = coord / 16384.0;
if (coord < 0)
return axis->default_value + r * (axis->default_value - axis->min_value);
else
return axis->default_value + r * (axis->max_value - axis->default_value);
}
static void
update_font_variations (void)
{
GtkWidget *child;
PangoFont *pango_font = NULL;
hb_font_t *hb_font;
hb_face_t *hb_face;
unsigned int n_axes;
hb_ot_var_axis_info_t *ai = NULL;
float *design_coords = NULL;
const int *coords;
unsigned int length;
int i;
while ((child = gtk_widget_get_first_child (variations_grid)))
gtk_grid_remove (GTK_GRID (variations_grid), child);
instance_combo = NULL;
g_hash_table_remove_all (axes);
g_hash_table_remove_all (instances);
pango_font = get_pango_font ();
hb_font = pango_font_get_hb_font (pango_font);
hb_face = hb_font_get_face (hb_font);
n_axes = hb_ot_var_get_axis_infos (hb_face, 0, NULL, NULL);
if (n_axes == 0)
goto done;
ai = g_new0 (hb_ot_var_axis_info_t, n_axes);
design_coords = g_new (float, n_axes);
hb_ot_var_get_axis_infos (hb_face, 0, &n_axes, ai);
coords = hb_font_get_var_coords_normalized (hb_font, &length);
for (i = 0; i < length; i++)
design_coords[i] = denorm_coord (&ai[i], coords[i]);
if (hb_ot_var_get_named_instance_count (hb_face) > 0)
{
GtkWidget *label;
GtkWidget *combo;
label = gtk_label_new ("Instance");
gtk_label_set_xalign (GTK_LABEL (label), 0);
gtk_widget_set_halign (label, GTK_ALIGN_START);
gtk_widget_set_valign (label, GTK_ALIGN_BASELINE);
gtk_grid_attach (GTK_GRID (variations_grid), label, 0, -1, 2, 1);
combo = gtk_combo_box_text_new ();
gtk_widget_set_valign (combo, GTK_ALIGN_BASELINE);
gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "");
for (i = 0; i < hb_ot_var_get_named_instance_count (hb_face); i++)
add_instance (hb_face, i, combo, i);
for (i = 0; i < hb_ot_var_get_named_instance_count (hb_face); i++)
{
if (matches_instance (hb_face, i, n_axes, design_coords))
{
gtk_combo_box_set_active (GTK_COMBO_BOX (combo), i + 1);
break;
}
}
gtk_grid_attach (GTK_GRID (variations_grid), combo, 1, -1, 2, 1);
g_signal_connect (combo, "changed", G_CALLBACK (instance_changed), NULL);
instance_combo = combo;
}
for (i = 0; i < n_axes; i++)
add_axis (hb_face, &ai[i], design_coords[i], i);
add_font_plane (n_axes);
done:
g_clear_object (&pango_font);
g_free (ai);
g_free (design_coords);
}
G_MODULE_EXPORT void
font_features_font_changed (void)
{
update_script_combo ();
update_features ();
update_font_variations ();
}
G_MODULE_EXPORT void
font_features_script_changed (void)
{
update_features ();
update_display ();
}
G_MODULE_EXPORT void
font_features_reset_features (void)
{
GList *l;
gtk_label_select_region (GTK_LABEL (the_label), 0, 0);
g_list_free_full (ranges, free_range);
ranges = NULL;
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
if (GTK_IS_CHECK_BUTTON (item->feat))
{
if (strcmp (item->name, "xxxx") == 0)
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), TRUE);
else
{
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), FALSE);
set_inconsistent (GTK_CHECK_BUTTON (item->feat), TRUE);
}
}
}
}
static char *text;
static void
switch_to_entry (void)
{
text = g_strdup (gtk_editable_get_text (GTK_EDITABLE (the_entry)));
gtk_stack_set_visible_child_name (GTK_STACK (stack), "entry");
gtk_widget_grab_focus (the_entry);
}
static void
switch_to_label (void)
{
g_free (text);
text = NULL;
gtk_stack_set_visible_child_name (GTK_STACK (stack), "label");
update_display ();
}
G_MODULE_EXPORT void
font_features_toggle_edit (void)
{
if (strcmp (gtk_stack_get_visible_child_name (GTK_STACK (stack)), "label") == 0)
switch_to_entry ();
else
switch_to_label ();
}
G_MODULE_EXPORT void
font_features_stop_edit (void)
{
g_signal_emit_by_name (edit_toggle, "clicked");
}
static gboolean
entry_key_press (GtkEventController *controller,
guint keyval,
guint keycode,
GdkModifierType modifiers,
GtkEntry *entry)
{
if (keyval == GDK_KEY_Escape)
{
gtk_editable_set_text (GTK_EDITABLE (entry), text);
font_features_stop_edit ();
return GDK_EVENT_STOP;
}
return GDK_EVENT_PROPAGATE;
}
GtkWidget *
do_font_features (GtkWidget *do_widget)
{
static GtkWidget *window = NULL;
if (!window)
{
GtkBuilder *builder;
GtkWidget *feature_list;
GtkEventController *controller;
builder = gtk_builder_new_from_resource ("/font_features/font-features.ui");
window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
feature_list = GTK_WIDGET (gtk_builder_get_object (builder, "feature_list"));
the_label = GTK_WIDGET (gtk_builder_get_object (builder, "label"));
settings = GTK_WIDGET (gtk_builder_get_object (builder, "settings"));
description = GTK_WIDGET (gtk_builder_get_object (builder, "description"));
resetbutton = GTK_WIDGET (gtk_builder_get_object (builder, "reset"));
font = GTK_WIDGET (gtk_builder_get_object (builder, "font"));
script_lang = GTK_WIDGET (gtk_builder_get_object (builder, "script_lang"));
stack = GTK_WIDGET (gtk_builder_get_object (builder, "stack"));
the_entry = GTK_WIDGET (gtk_builder_get_object (builder, "entry"));
edit_toggle = GTK_WIDGET (gtk_builder_get_object (builder, "edit_toggle"));
controller = gtk_event_controller_key_new ();
g_object_set_data_full (G_OBJECT (the_entry), "controller", g_object_ref (controller), g_object_unref);
g_signal_connect (controller, "key-pressed", G_CALLBACK (entry_key_press), the_entry);
gtk_widget_add_controller (the_entry, controller);
add_check_group (feature_list, _("Kerning"), (const char *[]){ "kern", NULL });
add_check_group (feature_list, _("Ligatures"), (const char *[]){ "liga",
"dlig",
"hlig",
"clig",
"rlig", NULL });
add_check_group (feature_list, _("Letter Case"), (const char *[]){ "smcp",
"c2sc",
"pcap",
"c2pc",
"unic",
"cpsp",
"case",NULL });
add_radio_group (feature_list, _("Number Case"), (const char *[]){ "xxxx",
"lnum",
"onum", NULL });
add_radio_group (feature_list, _("Number Spacing"), (const char *[]){ "xxxx",
"pnum",
"tnum", NULL });
add_radio_group (feature_list, _("Fractions"), (const char *[]){ "xxxx",
"frac",
"afrc", NULL });
add_check_group (feature_list, _("Numeric Extras"), (const char *[]){ "zero",
"nalt",
"sinf", NULL });
add_check_group (feature_list, _("Character Alternatives"), (const char *[]){ "swsh",
"cswh",
"locl",
"calt",
"falt",
"hist",
"salt",
"jalt",
"titl",
"rand",
"subs",
"sups",
"ordn",
"ltra",
"ltrm",
"rtla",
"rtlm",
"rclt", NULL });
add_check_group (feature_list, _("Positional Alternatives"), (const char *[]){ "init",
"medi",
"med2",
"fina",
"fin2",
"fin3",
"isol", NULL });
add_check_group (feature_list, _("Width Variants"), (const char *[]){ "fwid",
"hwid",
"halt",
"pwid",
"palt",
"twid",
"qwid", NULL });
add_check_group (feature_list, _("Alternative Stylistic Sets"), (const char *[]){ "ss01",
"ss02",
"ss03",
"ss04",
"ss05",
"ss06",
"ss07",
"ss08",
"ss09",
"ss10",
"ss11",
"ss12",
"ss13",
"ss14",
"ss15",
"ss16",
"ss17",
"ss18",
"ss19",
"ss20", NULL });
add_check_group (feature_list, _("Mathematical"), (const char *[]){ "dtls",
"flac",
"mgrk",
"ssty", NULL });
add_check_group (feature_list, _("Optical Bounds"), (const char *[]){ "opbd",
"lfbd",
"rtbd", NULL });
feature_items = g_list_reverse (feature_items);
variations_heading = GTK_WIDGET (gtk_builder_get_object (builder, "variations_heading"));
variations_grid = GTK_WIDGET (gtk_builder_get_object (builder, "variations_grid"));
if (instances == NULL)
instances = g_hash_table_new_full (instance_hash, instance_equal, NULL, free_instance);
else
g_hash_table_remove_all (instances);
if (axes == NULL)
axes = g_hash_table_new_full (axes_hash, axes_equal, NULL, g_free);
else
g_hash_table_remove_all (axes);
font_features_font_changed ();
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
g_object_unref (builder);
update_display ();
}
if (!gtk_widget_get_visible (window))
gtk_window_present (GTK_WINDOW (window));
else
gtk_window_destroy (GTK_WINDOW (window));
return window;
}
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