SWORD25: Worked around crash in options dialog.

I don't really know if this is correct, but aesthetically it goes well
with how the scale factor is treated.

svn-id: r53447

1 files changed, 4 insertions, 0 deletions

diff --git a/engines/sword25/gfx/bitmap.cpp b/engines/sword25/gfx/bitmap.cpp
index 3a6ffb4a98..db48b2d6fa 100644
--- a/engines/sword25/gfx/bitmap.cpp
+++ b/engines/sword25/gfx/bitmap.cpp
@@ -134,6 +134,8 @@ void Bitmap::setScaleFactorX(float scaleFactorX) {
 		_width = static_cast<int>(_originalWidth * _scaleFactorX);
 		if (_scaleFactorX <= 0.0f)
 			_scaleFactorX = 0.001f;
+		if (_width <= 0)
+			_width = 1;
 		forceRefresh();
 	}
 }
@@ -156,6 +158,8 @@ void Bitmap::setScaleFactorY(float scaleFactorY) {
 		_height = static_cast<int>(_originalHeight * scaleFactorY);
 		if (_scaleFactorY <= 0.0f)
 			_scaleFactorY = 0.001f;
+		if (_height <= 0)
+			_height = 1;
 		forceRefresh();
 	}
 }