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-rw-r--r--src/emu/tilemap.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/emu/tilemap.cpp b/src/emu/tilemap.cpp
index 11842e15901..df63d06c5c8 100644
--- a/src/emu/tilemap.cpp
+++ b/src/emu/tilemap.cpp
@@ -896,6 +896,7 @@ u8 tilemap_t::tile_apply_bitmask(const u8 *maskdata, u32 x0, u32 y0, u8 category
void tilemap_t::configure_blit_parameters(blit_parameters &blit, bitmap_ind8 &priority_bitmap, const rectangle &cliprect, u32 flags, u8 priority, u8 priority_mask)
{
// set the target bitmap
+ assert(priority_bitmap.cliprect().contains(cliprect));
blit.priority = &priority_bitmap;
blit.cliprect = cliprect;