started work on off screen bitmap support

libxrdp/libxrdp.h

@@ -387,6 +387,11 @@ xrdp_orders_send_bitmap2(struct xrdp_orders* self,
 int APP_CC
 xrdp_orders_send_brush(struct xrdp_orders* self, int width, int height,
                        int bpp, int type, int size, char* data, int cache_id);
+int APP_CC
+xrdp_orders_send_create_os_surface(struct xrdp_orders* self, int id,
+                                   int width, int height);
+int APP_CC
+xrdp_orders_send_switch_os_surface(struct xrdp_orders* self, int id);
 
 /* xrdp_bitmap_compress.c */
 int APP_CC

libxrdp/xrdp_orders.c

@@ -1965,3 +1965,45 @@ xrdp_orders_send_brush(struct xrdp_orders* self, int width, int height,
   out_uint8a(self->out_s, data, size);
   return 0;
 }
+
+/*****************************************************************************/
+/* returns error */
+/* send an off screen bitmap entry */
+int APP_CC
+xrdp_orders_send_create_os_surface(struct xrdp_orders* self, int id,
+                                   int width, int height)
+{
+  int order_flags;
+  int cache_id;
+
+  g_writeln("xrdp_orders_send_create_os_surface:");
+  xrdp_orders_check(self, 7);
+  self->order_count++;
+  order_flags = RDP_ORDER_SECONDARY;
+  order_flags |= 1 << 2; /* type RDP_ORDER_ALTSEC_CREATE_OFFSCR_BITMAP */
+  out_uint8(self->out_s, order_flags);
+  cache_id = id & 0x7fff;
+  out_uint16_le(self->out_s, cache_id);
+  out_uint16_le(self->out_s, width);
+  out_uint16_le(self->out_s, height);
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int APP_CC
+xrdp_orders_send_switch_os_surface(struct xrdp_orders* self, int id)
+{
+  int order_flags;
+  int cache_id;
+
+  g_writeln("xrdp_orders_send_switch_os_surface:");
+  xrdp_orders_check(self, 3);
+  self->order_count++;
+  order_flags = RDP_ORDER_SECONDARY;
+  order_flags |= 0 << 2; /* type RDP_ORDER_ALTSEC_SWITCH_SURFACE */
+  out_uint8(self->out_s, order_flags);
+  cache_id = id & 0xffff;
+  out_uint16_le(self->out_s, cache_id);
+  return 0;
+}

xrdp/xrdp.h

@@ -80,6 +80,13 @@ xrdp_cache_add_pointer_static(struct xrdp_cache* self,
 int APP_CC
 xrdp_cache_add_brush(struct xrdp_cache* self,
                      char* brush_item_data);
+int APP_CC
+xrdp_cache_add_os_bitmap(struct xrdp_cache* self, struct xrdp_bitmap* bitmap,
+                         int id);
+int APP_CC
+xrdp_cache_remove_os_bitmap(struct xrdp_cache* self, int id);
+struct xrdp_os_bitmap_item* APP_CC
+xrdp_cache_get_os_bitmap(struct xrdp_cache* self, int id);
 
 /* xrdp_wm.c */
 struct xrdp_wm* APP_CC

xrdp/xrdp_cache.c

@@ -73,6 +73,11 @@ xrdp_cache_delete(struct xrdp_cache* self)
       g_free(self->char_items[i][j].font_item.data);
     }
   }
+  for (i = 0; i < 2000; i++)
+  {
+    xrdp_bitmap_delete(self->os_bitmap_items[i].bitmap);
+  }
+
   g_free(self);
 }
 
@@ -532,3 +537,78 @@ xrdp_cache_add_brush(struct xrdp_cache* self,
   DEBUG(("adding brush at %d", index));
   return index;
 }
+
+/*****************************************************************************/
+/* returns index */
+int APP_CC
+xrdp_cache_add_os_bitmap(struct xrdp_cache* self, struct xrdp_bitmap* bitmap,
+                         int id)
+{
+  int index;
+  struct xrdp_os_bitmap_item* bi;
+
+  if (id < 1)
+  {
+    return -1;
+  }
+  index = 0;
+  for (index = 0; index < 2000; index++)
+  {
+    bi = self->os_bitmap_items + index;
+    if (bi->bitmap == 0)
+    {
+      bi->id = id;
+      bi->bitmap = bitmap;
+      //g_writeln("xrdp_cache_add_os_bitmap: bitmap id 0x%x added at index %d", id, index);
+      return index;
+    }
+  }
+  g_writeln("xrdp_cache_add_os_bitmap: bitmap id 0x%x not added, full", id);
+  return -1;
+}
+
+/*****************************************************************************/
+/* returns index */
+int APP_CC
+xrdp_cache_remove_os_bitmap(struct xrdp_cache* self, int id)
+{
+  int index;
+  struct xrdp_os_bitmap_item* bi;
+
+  if (id < 1)
+  {
+    return -1;
+  }
+  for (index = 0; index < 2000; index++)
+  {
+    bi = self->os_bitmap_items + index;
+    if (bi->id == id)
+    {
+      xrdp_bitmap_delete(bi->bitmap);
+      g_memset(bi, 0, sizeof(struct xrdp_os_bitmap_item));
+      //g_writeln("xrdp_cache_remove_os_bitmap: bitmap id 0x%x removed from index %d", id, index);
+      return index;
+    }
+  }
+  return -1;
+}
+
+/*****************************************************************************/
+struct xrdp_os_bitmap_item* APP_CC
+xrdp_cache_get_os_bitmap(struct xrdp_cache* self, int id)
+{
+  int index;
+  struct xrdp_os_bitmap_item* bi;
+
+  for (index = 0; index < 2000; index++)
+  {
+    bi = self->os_bitmap_items + index;
+    if (bi->id == id)
+    {
+      //g_writeln("xrdp_cache_get_os_bitmap: bitmap id 0x%x found at index %d", id, index);
+      return bi;
+    }
+  }
+  g_writeln("xrdp_cache_get_os_bitmap: bitmap id 0x%x not found", id);
+  return 0;
+}

xrdp/xrdp_types.h

@@ -117,6 +117,12 @@ struct xrdp_bitmap_item
   struct xrdp_bitmap* bitmap;
 };
 
+struct xrdp_os_bitmap_item
+{
+  int id;
+  struct xrdp_bitmap* bitmap;
+};
+
 struct xrdp_char_item
 {
   int stamp;
@@ -169,6 +175,7 @@ struct xrdp_cache
   int pointer_cache_entries;
   int brush_stamp;
   struct xrdp_brush_item brush_items[64];
+  struct xrdp_os_bitmap_item os_bitmap_items[2000];
 };
 
 struct xrdp_mm