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Fix GtkDial to not recreate the cairo patterns on every draw

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This commit is contained in:
Geoffrey D. Bennett
2024-02-08 20:08:38 +10:30
parent 1815f61280
commit a26f607a8b
1 changed files with 68 additions and 44 deletions
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112
src/gtkdial.c
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@@ -140,6 +140,10 @@ struct _GtkDial {
double zero_db_x;
double zero_db_y;
// cairo patterns dependent on the above
cairo_pattern_t *fill_pattern[2][2];
cairo_pattern_t *outline_pattern[2];
// variables derived from the dial value
double valp;
double angle;
@@ -263,6 +267,24 @@ static double calculate_dial_radius_from_height(int height) {
return height / (1 + cos(angle));
}
// internal replacement for cairo_pattern_add_color_stop_rgb() that
// dims the color if the widget is insensitive and brightens it by
// focus_mult
static void cairo_add_stop_rgb_dim(
cairo_pattern_t *pat,
double offset,
double r,
double g,
double b,
int dim,
double focus_mult
) {
double x = dim ? 0.5 : 1.0;
x *= focus_mult;
cairo_pattern_add_color_stop_rgb(pat, offset, r * x, g * x, b * x);
}
static void update_dial_properties(GtkDial *dial) {
// always update
@@ -318,6 +340,40 @@ static void update_dial_properties(GtkDial *dial) {
dial->zero_db_x = cos(zero_db_angle) * dial->slider_radius + dial->cx;
dial->zero_db_y = sin(zero_db_angle) * dial->slider_radius + dial->cy;
}
// generate cairo fill patterns
for (int focus = 0; focus <= 1; focus++) {
for (int dim = 0; dim <= 1; dim++) {
if (dial->fill_pattern[focus][dim])
cairo_pattern_destroy(dial->fill_pattern[focus][dim]);
cairo_pattern_t *pat = cairo_pattern_create_radial(
dial->cx + 5, dial->cy + 5, 0, dial->cx, dial->cy, dial->radius
);
cairo_add_stop_rgb_dim(pat, 0.0, 0.18, 0.18, 0.20, dim, focus ? 1.65 : 1);
cairo_add_stop_rgb_dim(pat, 0.4, 0.18, 0.18, 0.20, dim, focus ? 1.65 : 1);
cairo_add_stop_rgb_dim(pat, 1.0, 0.40, 0.40, 0.42, dim, focus ? 1.25 : 1);
dial->fill_pattern[focus][dim] = pat;
}
}
// generate cairo outline pattern
for (int dim = 0; dim <= 1; dim++) {
if (dial->outline_pattern[dim])
cairo_pattern_destroy(dial->outline_pattern[dim]);
cairo_pattern_t *pat = cairo_pattern_create_linear(
dial->cx - dial->radius / 2,
dial->cy - dial->radius / 2,
dial->cx + dial->radius / 2,
dial->cy + dial->radius / 2
);
cairo_add_stop_rgb_dim(pat, 0, 0.9, 0.9, 0.9, dim, 1);
cairo_add_stop_rgb_dim(pat, 1, 0.3, 0.3, 0.3, dim, 1);
dial->outline_pattern[dim] = pat;
}
}
static void update_dial_values(GtkDial *dial) {
@@ -595,22 +651,6 @@ static void cairo_set_source_rgba_dim(
cairo_set_source_rgba(cr, r, g, b, a);
}
// internal replacement for cairo_pattern_add_color_stop_rgb() that
// dims the color if the widget is insensitive
static void cairo_add_stop_rgb_dim(
cairo_pattern_t *pat,
double offset,
double r,
double g,
double b,
int dim
) {
if (dim)
cairo_pattern_add_color_stop_rgb(pat, offset, r * 0.5, g * 0.5, b * 0.5);
else
cairo_pattern_add_color_stop_rgb(pat, offset, r, g, b);
}
static void draw_slider(
GtkDial *dial,
cairo_t *cr,
@@ -685,43 +725,18 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
}
// fill the circle
cairo_pattern_t *pat;
pat = cairo_pattern_create_radial(
dial->cx + 5, dial->cy + 5, 0, dial->cx, dial->cy, dial->radius
);
if (gtk_widget_has_focus(GTK_WIDGET(dial))) {
cairo_add_stop_rgb_dim(pat, 0.0, 0.30, 0.30, 0.33, dial->dim);
cairo_add_stop_rgb_dim(pat, 0.4, 0.30, 0.30, 0.33, dial->dim);
cairo_add_stop_rgb_dim(pat, 1.0, 0.50, 0.50, 0.53, dial->dim);
} else {
cairo_add_stop_rgb_dim(pat, 0.0, 0.18, 0.18, 0.20, dial->dim);
cairo_add_stop_rgb_dim(pat, 0.4, 0.18, 0.18, 0.20, dial->dim);
cairo_add_stop_rgb_dim(pat, 1.0, 0.40, 0.40, 0.42, dial->dim);
}
cairo_set_source(cr, pat);
int has_focus = gtk_widget_has_focus(GTK_WIDGET(dial));
cairo_set_source(cr, dial->fill_pattern[has_focus][dial->dim]);
cairo_arc(cr, dial->cx, dial->cy, dial->knob_radius, 0, 2 * M_PI);
cairo_fill(cr);
// draw the circle
cairo_pattern_t *pat2;
pat2 = cairo_pattern_create_linear(
dial->cx - dial->radius / 2,
dial->cy - dial->radius / 2,
dial->cx + dial->radius / 2,
dial->cy + dial->radius / 2
);
cairo_add_stop_rgb_dim(pat2, 0, 0.9, 0.9, 0.9, dial->dim);
cairo_add_stop_rgb_dim(pat2, 1, 0.3, 0.3, 0.3, dial->dim);
cairo_set_source(cr, pat2);
cairo_set_source(cr, dial->outline_pattern[dial->dim]);
cairo_arc(cr, dial->cx, dial->cy, dial->knob_radius, 0, 2 * M_PI);
cairo_set_line_width(cr, 2);
cairo_stroke(cr);
cairo_pattern_destroy(pat);
cairo_pattern_destroy(pat2);
cairo_destroy(cr);
}
@@ -1203,6 +1218,15 @@ void gtk_dial_dispose(GObject *o) {
dial->taper_outputs = NULL;
dial->taper_breakpoints_count = 0;
for (int focus = 0; focus <= 1; focus++)
for (int dim = 0; dim <= 1; dim++)
if (dial->fill_pattern[focus][dim])
cairo_pattern_destroy(dial->fill_pattern[focus][dim]);
for (int dim = 0; dim <= 1; dim++)
if (dial->outline_pattern[dim])
cairo_pattern_destroy(dial->outline_pattern[dim]);
g_object_unref(dial->adj);
dial->adj = NULL;
G_OBJECT_CLASS(gtk_dial_parent_class)->dispose(o);