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(draw_frame) central frame-drawing function, using draw-event context.

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This commit is contained in:
Antonio Carzaniga 2021-12-03 16:00:36 +01:00
parent 3d6751cd15
commit 1c451f76ef
1 changed files with 13 additions and 20 deletions
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31
balls.c
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@ -367,21 +367,7 @@ void draw_space_ship (cairo_t * cr) {
cairo_restore(cr);
}
void draw_balls_onto_window () {
/* clear pixmap */
GdkWindow * window = gtk_widget_get_window(canvas);
cairo_region_t * c_region = cairo_region_create();
GdkDrawingContext * d_context = gdk_window_begin_draw_frame (window, c_region);
cairo_t * cr = gdk_drawing_context_get_cairo_context (d_context);
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, clear_alpha);
cairo_paint(cr);
draw_gravity_vector(cr);
/* draw balls */
draw_space_ship(cr);
void draw_balls (cairo_t * cr) {
for (const struct ball * b = balls; b != balls + n_balls; ++b) {
cairo_save(cr);
cairo_translate(cr, b->x - b->radius, b->y - b->radius);
@ -398,8 +384,15 @@ void draw_balls_onto_window () {
cairo_paint(cr);
cairo_restore(cr);
}
gdk_window_end_draw_frame(window, d_context);
cairo_region_destroy(c_region);
}
gboolean draw_frame (GtkWidget * widget, cairo_t *cr, gpointer data) {
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, clear_alpha);
cairo_paint(cr);
draw_gravity_vector(cr);
draw_balls(cr);
draw_space_ship(cr);
return FALSE;
}
gint configure_event (GtkWidget *widget, GdkEventConfigure * event) {
@ -519,11 +512,11 @@ static unsigned int stats_draw_samples = 0;
gboolean draw_event (GtkWidget *widget, cairo_t * cr, gpointer data) {
if (stats_sampling > 0) {
guint64 start = g_get_monotonic_time ();
draw_balls_onto_window();
draw_frame (widget, cr, data);
stats_draw_usec += g_get_monotonic_time () - start;
++stats_draw_samples;
} else
draw_balls_onto_window();
draw_frame (widget, cr, data);
return FALSE;
}