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-rw-r--r--src/gfx.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/gfx.cpp b/src/gfx.cpp
index 605ff7664..85cd3bfb5 100644
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -1317,7 +1317,11 @@ void DrawDirtyBlocks()
/* Wait a while and update _realtime_tick so we are given the rights */
if (!IsFirstModalProgressLoop()) CSleep(MODAL_PROGRESS_REDRAW_TIMEOUT);
_realtime_tick += MODAL_PROGRESS_REDRAW_TIMEOUT;
+
+ /* Modal progress thread may need blitter access while we are waiting for it. */
+ VideoDriver::GetInstance()->ReleaseBlitterLock();
_modal_progress_paint_mutex->BeginCritical();
+ VideoDriver::GetInstance()->AcquireBlitterLock();
_modal_progress_work_mutex->BeginCritical();
/* When we ended with the modal progress, do not draw the blocks.