redraw the window when it's hidden and reshown

4 files changed, 15 insertions, 3 deletions

diff --git a/display.c b/display.c
index cf38fa5..a5e0068 100644
--- a/display.c
+++ b/display.c
@@ -4,6 +4,8 @@
 
 void runes_display_init(RunesTerm *t)
 {
+    cairo_set_source_rgb(t->cr, 1.0, 1.0, 1.0);
+    cairo_paint(t->cr);
     cairo_select_font_face(t->cr, "monospace", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
     cairo_set_font_size(t->cr, 14.0);
     cairo_set_source_rgb(t->cr, 0.0, 0.0, 1.0);
diff --git a/term.c b/term.c
index 2199332..06f4571 100644
--- a/term.c
+++ b/term.c
@@ -4,6 +4,8 @@
 
 void runes_term_init(RunesTerm *t, int argc, char *argv[])
 {
+    int x, y;
+
     /* doing most of the pty initialization right at the beginning, because
      * libuv will set up a bunch of state (including potentially things like
      * spawning threads) when that is initialized, and i'm not really sure how
@@ -15,7 +17,9 @@ void runes_term_init(RunesTerm *t, int argc, char *argv[])
     runes_pty_backend_loop_init(t);
 
     runes_window_backend_init(t, argc, argv);
-    t->cr = cairo_create(runes_window_backend_surface_create(t));
+    t->backend_cr = cairo_create(runes_window_backend_surface_create(t));
+    runes_window_backend_get_size(t, &x, &y);
+    t->cr = cairo_create(cairo_surface_create_similar_image(cairo_get_target(t->backend_cr), CAIRO_FORMAT_RGB24, x, y));
 }
 
 void runes_term_cleanup(RunesTerm *t)
diff --git a/term.h b/term.h
index 0d00cfb..9856ce2 100644
--- a/term.h
+++ b/term.h
@@ -6,6 +6,7 @@ struct runes_term {
     RunesPtyBackend pty;
 
     cairo_t *cr;
+    cairo_t *backend_cr;
     uv_loop_t *loop;
 
     int row;
diff --git a/window-xlib.c b/window-xlib.c
index 7360dde..17351ed 100644
--- a/window-xlib.c
+++ b/window-xlib.c
@@ -66,6 +66,9 @@ static void runes_process_event(uv_work_t *req, int status)
             free(buf);
             break;
         }
+        case Expose:
+            runes_window_backend_flush(t);
+            break;
         case ClientMessage: {
             Atom a = e->xclient.data.l[0];
             if (a == w->atoms[RUNES_ATOM_WM_DELETE_WINDOW]) {
@@ -130,7 +133,7 @@ static void runes_window_init_loop(RunesTerm *t)
     w = &t->w;
 
     XGetICValues(w->ic, XNFilterEvents, &mask, NULL);
-    XSelectInput(w->dpy, w->w, mask|KeyPressMask|StructureNotifyMask);
+    XSelectInput(w->dpy, w->w, mask|KeyPressMask|StructureNotifyMask|ExposureMask);
     XSetICFocus(w->ic);
 
     data = malloc(sizeof(RunesXlibLoopData));
@@ -201,6 +204,8 @@ cairo_surface_t *runes_window_backend_surface_create(RunesTerm *t)
 
 void runes_window_backend_flush(RunesTerm *t)
 {
+    cairo_set_source_surface(t->backend_cr, cairo_get_target(t->cr), 0.0, 0.0);
+    cairo_paint(t->backend_cr);
     XFlush(t->w.dpy);
 }
 
@@ -208,7 +213,7 @@ void runes_window_backend_get_size(RunesTerm *t, int *xpixel, int *ypixel)
 {
     cairo_surface_t *surface;
 
-    surface = cairo_get_target(t->cr);
+    surface = cairo_get_target(t->backend_cr);
     *xpixel = cairo_xlib_surface_get_width(surface);
     *ypixel = cairo_xlib_surface_get_height(surface);
 }