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fontchooser: Speed up fature examples

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We were doing unnecessary work here, which could
get really slow with some fonts. Just compute
the reverse charmap once and reuse it.
This commit is contained in:
Matthias Clasen 2021-12-31 09:17:42 -05:00
parent ff24dfb2e7
commit 791dc7b9be
1 changed files with 47 additions and 26 deletions
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73
gtk/gtkfontchooserwidget.c
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@ -152,6 +152,8 @@ struct _GtkFontChooserWidget
GList *feature_items;
GAction *tweak_action;
hb_map_t *glyphmap;
};
struct _GtkFontChooserWidgetClass
@ -1794,11 +1796,12 @@ feat_pressed (GtkGestureClick *gesture,
}
static char *
find_affected_text (hb_tag_t feature_tag,
hb_font_t *hb_font,
hb_tag_t script_tag,
hb_tag_t lang_tag,
int max_chars)
find_affected_text (GtkFontChooserWidget *fontchooser,
hb_tag_t feature_tag,
hb_font_t *hb_font,
hb_tag_t script_tag,
hb_tag_t lang_tag,
int max_chars)
{
hb_face_t *hb_face;
unsigned int script_index = 0;
@ -1848,24 +1851,35 @@ find_affected_text (hb_tag_t feature_tag,
glyphs_after,
glyphs_output);
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;
}
if (!fontchooser->glyphmap)
{
fontchooser->glyphmap = hb_map_create ();
for (hb_codepoint_t ch = 0; ch < 0xffff; ch++)
{
hb_codepoint_t glyph = 0;
if (hb_font_get_nominal_glyph (hb_font, ch, &glyph) &&
!hb_map_has (fontchooser->glyphmap, glyph))
hb_map_set (fontchooser->glyphmap, glyph, ch);
}
}
}
while (hb_set_next (glyphs_input, &gid))
{
hb_codepoint_t ch;
if (n_chars == max_chars)
{
g_string_append (chars, "…");
break;
}
ch = hb_map_get (fontchooser->glyphmap, gid);
if (ch != HB_MAP_VALUE_INVALID)
{
g_string_append_unichar (chars, (gunichar)ch);
n_chars++;
}
}
hb_set_destroy (glyphs_input);
}
}
@ -1874,7 +1888,8 @@ find_affected_text (hb_tag_t feature_tag,
}
static void
update_feature_example (FeatureItem *item,
update_feature_example (GtkFontChooserWidget *fontchooser,
FeatureItem *item,
hb_font_t *hb_font,
hb_tag_t script_tag,
hb_tag_t lang_tag,
@ -1929,9 +1944,9 @@ update_feature_example (FeatureItem *item,
else if (strcmp (item->name, "frac") == 0)
input = g_strdup ("1/2 2/3 7/8");
else if (strcmp (item->name, "nalt") == 0)
input = find_affected_text (item->tag, hb_font, script_tag, lang_tag, 3);
input = find_affected_text (fontchooser, item->tag, hb_font, script_tag, lang_tag, 3);
else
input = find_affected_text (item->tag, hb_font, script_tag, lang_tag, 10);
input = find_affected_text (fontchooser, item->tag, hb_font, script_tag, lang_tag, 10);
if (input[0] != '\0')
{
@ -2211,7 +2226,7 @@ gtk_font_chooser_widget_update_font_features (GtkFontChooserWidget *fontchooser)
gtk_widget_show (item->top);
gtk_widget_show (gtk_widget_get_parent (item->top));
update_feature_example (item, hb_font, script_tag, lang_tag, fontchooser->font_desc);
update_feature_example (fontchooser, item, hb_font, script_tag, lang_tag, fontchooser->font_desc);
if (GTK_IS_CHECK_BUTTON (item->feat))
{
@ -2227,6 +2242,12 @@ gtk_font_chooser_widget_update_font_features (GtkFontChooserWidget *fontchooser)
}
}
}
if (fontchooser->glyphmap)
{
hb_map_destroy (fontchooser->glyphmap);
fontchooser->glyphmap = NULL;
}
}
g_object_unref (pango_font);