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Replace cairo_show_text() in gtkdial.c with Pango

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Fixes: #126.
This commit is contained in:
Geoffrey D. Bennett
2024-07-03 02:31:55 +09:30
parent c5b1ff0b94
commit 0187698826
1 changed files with 33 additions and 5 deletions
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38
src/gtkdial.c
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@@ -154,6 +154,10 @@ struct _GtkDial {
cairo_pattern_t *fill_pattern[2][2];
cairo_pattern_t *outline_pattern[2];
// pango resources for displaying the peak value
PangoLayout *peak_layout;
PangoFontDescription *peak_font_desc;
// variables derived from the dial value
double valp;
double angle;
@@ -405,6 +409,21 @@ static int update_dial_properties(GtkDial *dial) {
dial->outline_pattern[dim] = pat;
}
// init pango layout for peak value
if (dial->peak_layout)
g_object_unref(dial->peak_layout);
if (dial->peak_font_desc)
pango_font_description_free(dial->peak_font_desc);
PangoContext *context = gtk_widget_create_pango_context(GTK_WIDGET(dial));
dial->peak_layout = pango_layout_new(context);
dial->peak_font_desc = pango_context_get_font_description(context);
int size = pango_font_description_get_size(dial->peak_font_desc) * 0.6;
dial->peak_font_desc = pango_font_description_copy(dial->peak_font_desc);
pango_font_description_set_size(dial->peak_font_desc, size);
pango_layout_set_font_description(dial->peak_layout, dial->peak_font_desc);
g_object_unref(context);
// calculate level meter breakpoint angles
if (dial->level_breakpoint_angles)
free(dial->level_breakpoint_angles);
@@ -783,16 +802,20 @@ static void show_peak_value(GtkDial *dial, cairo_t *cr) {
p += sprintf(p, "−");
snprintf(p, 10, "%.0f", fabs(value));
cairo_text_extents_t extents;
cairo_text_extents(cr, s, &extents);
pango_layout_set_text(dial->peak_layout, s, -1);
int width, height;
pango_layout_get_pixel_size(dial->peak_layout, &width, &height);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.5, dial->dim);
cairo_move_to(
cr,
dial->cx - extents.width / 2,
dial->cy + extents.height / 2
dial->cx - width / 2 - 1,
dial->cy - height / 2
);
cairo_show_text(cr, s);
pango_cairo_show_layout(cr, dial->peak_layout);
}
static void draw_slider(
@@ -1522,6 +1545,11 @@ void gtk_dial_dispose(GObject *o) {
if (dial->outline_pattern[dim])
cairo_pattern_destroy(dial->outline_pattern[dim]);
if (dial->peak_layout)
g_object_unref(dial->peak_layout);
if (dial->peak_font_desc)
pango_font_description_free(dial->peak_font_desc);
g_object_unref(dial->adj);
dial->adj = NULL;
G_OBJECT_CLASS(gtk_dial_parent_class)->dispose(o);