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(svn r11456) -Fix [FS#1412] (r10070): Viewport is bound to its top-left corner

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smatz
2007-11-18 13:13:59 +00:00
parent 5b21a839a9
commit b48c5a3c92
2 changed files with 47 additions and 4 deletions
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11
src/viewport.cpp
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@@ -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;