- Fixed several bugs while resizing an existing screenbuffer.

server/console.c

@@ -163,14 +163,38 @@ static int console_input_events_signaled( struct object *obj, struct thread *thr
 static void console_input_events_append( struct console_input_events* evts,
 					 struct console_renderer_event* evt)
 {
-    /* to be done even when the renderer generates the events ? */
-    if (evts->num_used == evts->num_alloc)
+    int collapsed = FALSE;
+
+    /* to be done even when evt has been generated by the rendere ? */
+
+    /* try to collapse evt into current queue's events */
+    if (evts->num_used)
+    {
+        struct console_renderer_event* last = &evts->events[evts->num_used - 1];
+
+        if (last->event == CONSOLE_RENDERER_UPDATE_EVENT &&
+            evt->event == CONSOLE_RENDERER_UPDATE_EVENT)
+        {
+            /* if two update events overlap, collapse them into a single one */
+            if (last->u.update.bottom + 1 >= evt->u.update.top &&
+                evt->u.update.bottom + 1 >= last->u.update.top)
+            {
+                last->u.update.top = min(last->u.update.top, evt->u.update.top);
+                last->u.update.bottom = max(last->u.update.bottom, evt->u.update.bottom);
+                collapsed = TRUE;
+            }
+        }
+    }
+    if (!collapsed)
     {
-	evts->num_alloc += 16;
-	evts->events = realloc( evts->events, evts->num_alloc * sizeof(*evt) );
-	assert(evts->events);
+        if (evts->num_used == evts->num_alloc)
+        {
+            evts->num_alloc += 16;
+            evts->events = realloc( evts->events, evts->num_alloc * sizeof(*evt) );
+            assert(evts->events);
+        }
+        evts->events[evts->num_used++] = *evt;
     }
-    evts->events[evts->num_used++] = *evt;
     wake_up( &evts->obj, 0 );
 }
 
@@ -291,10 +315,10 @@ static struct screen_buffer *create_console_output( struct console_input *consol
 	evt.u.update.bottom = screen_buffer->height - 1;
 	console_input_events_append( console_input->evt, &evt );
 
-	evt.event = CONSOLE_RENDERER_CURSOR_GEOM_EVENT;
-	evt.u.cursor_geom.size    = screen_buffer->cursor_size;
-	evt.u.cursor_geom.visible = screen_buffer->cursor_visible;
-	console_input_events_append( console_input->evt, &evt );
+ 	evt.event = CONSOLE_RENDERER_CURSOR_GEOM_EVENT;
+ 	evt.u.cursor_geom.size    = screen_buffer->cursor_size;
+ 	evt.u.cursor_geom.visible = screen_buffer->cursor_visible;
+ 	console_input_events_append( console_input->evt, &evt );
 
 	evt.event = CONSOLE_RENDERER_CURSOR_POS_EVENT;
 	evt.u.cursor_pos.x = screen_buffer->cursor_x;
@@ -745,6 +769,15 @@ static int set_console_output_info( struct screen_buffer *screen_buffer,
     }
     if (req->mask & SET_CONSOLE_OUTPUT_INFO_SIZE)
     {
+        unsigned cc;
+
+        /* new screen-buffer cannot be smaller than actual window */
+	if (req->width < screen_buffer->win.right - screen_buffer->win.left + 1 ||
+            req->height < screen_buffer->win.bottom - screen_buffer->win.top + 1)
+	{
+	    set_error( STATUS_INVALID_PARAMETER );
+	    return 0;
+	}
         /* FIXME: there are also some basic minimum and max size to deal with */
         if (!change_screen_buffer_size( screen_buffer, req->width, req->height )) return 0;
 
@@ -753,6 +786,44 @@ static int set_console_output_info( struct screen_buffer *screen_buffer,
 	evt.u.resize.height = req->height;
 	console_input_events_append( screen_buffer->input->evt, &evt );
 
+	evt.event = CONSOLE_RENDERER_UPDATE_EVENT;
+	evt.u.update.top    = 0;
+	evt.u.update.bottom = screen_buffer->height - 1;
+	console_input_events_append( screen_buffer->input->evt, &evt );
+
+        /* scroll window to display sb */
+        if (screen_buffer->win.right >= req->width)
+        {       
+            screen_buffer->win.right -= screen_buffer->win.left;
+            screen_buffer->win.left = 0;
+        }
+        if (screen_buffer->win.bottom >= req->height)
+        {       
+            screen_buffer->win.bottom -= screen_buffer->win.top;
+            screen_buffer->win.top = 0;
+        }
+        /* reset cursor if needed (normally, if cursor was outside of new sb, the
+         * window has been shifted so that the new position of the cursor will be 
+         * visible */
+        cc = 0;
+        if (screen_buffer->cursor_x >= req->width)
+        {
+            screen_buffer->cursor_x = req->width - 1;
+            cc++;
+        }
+        if (screen_buffer->cursor_y >= req->height)
+        {
+            screen_buffer->cursor_y = req->height - 1;
+            cc++;
+        }
+        if (cc)
+        {
+            evt.event = CONSOLE_RENDERER_CURSOR_POS_EVENT;
+            evt.u.cursor_pos.x = req->cursor_x;
+            evt.u.cursor_pos.y = req->cursor_y;
+            console_input_events_append( screen_buffer->input->evt, &evt );
+        }
+
 	if (screen_buffer == screen_buffer->input->active &&
 	    screen_buffer->input->mode & ENABLE_WINDOW_INPUT)
 	{
@@ -851,7 +922,7 @@ static void console_input_append_hist( struct console_input* console, const WCHA
     }
 }
 
-/* returns a line from the cachde */
+/* returns a line from the cache */
 static size_t console_input_get_hist( struct console_input *console, int index )
 {
     size_t ret = 0;
@@ -1000,8 +1071,8 @@ static int write_console_output( struct screen_buffer *screen_buffer, size_t siz
     {
         struct console_renderer_event evt;
         evt.event = CONSOLE_RENDERER_UPDATE_EVENT;
-        evt.u.update.top    = y;
-        evt.u.update.bottom = (y * screen_buffer->width + x + i - 1) / screen_buffer->width;
+        evt.u.update.top    = y + x / screen_buffer->width;
+        evt.u.update.bottom = y + (x + i - 1) / screen_buffer->width;
         console_input_events_append( screen_buffer->input->evt, &evt );
     }
     return i;