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label-pango: Replace characters not supported by fonts with a replacement character

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Using a replacement character prevents hexboxes from appearing, which can mess up alignment of monospace fonts
This commit is contained in:
nerdopolis 2023-10-10 07:45:35 -04:00 • committed by Ray Strode
parent d4560c71e7
commit 06cd316a34
1 changed files with 45 additions and 0 deletions
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45
src/plugins/controls/label-pango/plugin.c
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@ -164,6 +164,50 @@ get_cairo_context_for_sizing (ply_label_plugin_control_t *label)
return cairo_context;
}
void
remove_hexboxes_from_pango_layout (PangoLayout *pango_layout)
{
PangoLayoutIter *iter;
bool hexbox_removed = false;
ply_buffer_t *buffer = ply_buffer_new ();
const char *old_string = pango_layout_get_text (pango_layout);
iter = pango_layout_get_iter (pango_layout);
do {
PangoLayoutRun *run;
PangoGlyphItem *glyph_items;
PangoGlyphString *glyph_string;
run = pango_layout_iter_get_run_readonly (iter);
if (!run)
continue;
glyph_items = (PangoGlyphItem *) run;
glyph_string = glyph_items->glyphs;
if (glyph_string->num_glyphs == 0)
continue;
for (size_t i = 0; i < glyph_string->num_glyphs; i++) {
if (glyph_string->glyphs[i].glyph & PANGO_GLYPH_UNKNOWN_FLAG) {
hexbox_removed = true;
ply_buffer_append (buffer, "%c", '?');
} else {
ply_buffer_append_bytes (buffer, old_string + glyph_items->item->offset, glyph_items->item->length);
}
}
} while (pango_layout_iter_next_run (iter));
pango_layout_iter_free (iter);
if (hexbox_removed) {
const char *new_string = ply_buffer_get_bytes (buffer);
pango_layout_set_text (pango_layout, new_string, -1);
}
ply_buffer_free (buffer);
}
static PangoLayout *
init_pango_text_layout (cairo_t *cairo_context,
char *text,
@ -245,6 +289,7 @@ draw_control (ply_label_plugin_control_t *label,
cairo_context = get_cairo_context_for_pixel_buffer (label, pixel_buffer, &center_x, &center_y);
pango_layout = init_pango_text_layout (cairo_context, label->text, label->fontdesc, label->alignment, label->width);
remove_hexboxes_from_pango_layout (pango_layout);
pango_layout_get_size (pango_layout, &text_width, &text_height);
label->area.width = (long) ((double) text_width / PANGO_SCALE);