diff options
Diffstat (limited to 'src/viewport.cpp')
| -rw-r--r-- | src/viewport.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/viewport.cpp b/src/viewport.cpp index 307b90598..74c774ff2 100644 --- a/src/viewport.cpp +++ b/src/viewport.cpp @@ -296,10 +296,13 @@ static void SetViewportPosition(Window *w, int x, int y) vp->virtual_left = x; vp->virtual_top = y; - old_left = UnScaleByZoom(old_left, vp->zoom); - old_top = UnScaleByZoom(old_top, vp->zoom); - x = UnScaleByZoom(x, vp->zoom); - y = UnScaleByZoom(y, vp->zoom); + /* viewport is bound to its left top corner, so it must be rounded down (UnScaleByZoomLower) + * else glitch described in FS#1412 will happen (offset by 1 pixel with zoom level > NORMAL) + */ + old_left = UnScaleByZoomLower(old_left, vp->zoom); + old_top = UnScaleByZoomLower(old_top, vp->zoom); + x = UnScaleByZoomLower(x, vp->zoom); + y = UnScaleByZoomLower(y, vp->zoom); old_left -= x; old_top -= y; |