kayprish/mandelbrot-visualiser
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Add queue_redraw_plane function

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Create a function which queues the next draw, and add a call to it by
the final worker thread to finish drawing.
This commit is contained in:
Petar Kapriš 2025-10-13 22:13:10 +02:00
parent f5be463c05
commit 8ad76abac9
1 changed files with 27 additions and 1 deletions
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28
visor.c
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@ -69,6 +69,10 @@ void draw_mandelbrot(struct threadInfo *info);
void color_from_iteration(int *r, int *g, int *b, double x0, double y0);
void color_lookup(int *r, int *g, int *b, double mu);
// This function is from the main thread, but it needs to be referenced by
// worker code
gboolean queue_redraw_plane(void *arg);
void *writer_thread(void *arg)
{
struct threadInfo *info = arg;
@ -131,6 +135,7 @@ void draw_mandelbrot(struct threadInfo *info)
}
if (allWritersComplete) {
cairo_surface_mark_dirty(surface);
g_main_context_invoke(NULL, queue_redraw_plane, NULL);
}
pthread_mutex_unlock(&pixmapMutex);
}
@ -285,6 +290,8 @@ void print_usage(FILE *stream)
fprintf(stream, "%s", err_msg);
}
GtkDrawingArea *da;
static void app_activate(GApplication *app)
{
GtkWidget *win;
@ -292,7 +299,6 @@ static void app_activate(GApplication *app)
GtkWidget *btn2;
GtkWidget *bigBox;
GtkWidget *vertBox;
GtkDrawingArea *da;
win = gtk_application_window_new(GTK_APPLICATION(app));
gtk_window_set_title(GTK_WINDOW(win), "Mandelbrot visualiser");
@ -318,6 +324,7 @@ static void app_activate(GApplication *app)
bigBox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
// global to enable other functions to call for a redraw
da = g_object_new(GTK_TYPE_DRAWING_AREA,
"accessible-role", GTK_ACCESSIBLE_ROLE_IMG,
NULL);
@ -336,6 +343,25 @@ static void app_activate(GApplication *app)
gtk_window_present(GTK_WINDOW(win));
}
gboolean queue_redraw_plane(void *arg)
{
(void) arg;
bool allWritersHadCompleted = true;
for (int32_t i = 0; i < thread_count; i++) {
if (!threads[i].complete) {
allWritersHadCompleted = false;
break;
}
}
if (!allWritersHadCompleted) {
return G_SOURCE_REMOVE;
}
gtk_widget_queue_draw(GTK_WIDGET(da));
return G_SOURCE_REMOVE;
}
void blit_plane(GtkDrawingArea *da, cairo_t *cr, int width, int height, gpointer data)
{
(void) da;