diff options
| -rw-r--r-- | src/gfx.cpp | 2 | ||||
| -rw-r--r-- | src/zoom.hpp | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/src/gfx.cpp b/src/gfx.cpp index a0812baed..d529728de 100644 --- a/src/gfx.cpp +++ b/src/gfx.cpp @@ -856,7 +856,7 @@ static inline void GfxBlitTileZoom(BlitterParams *bp) if (num <= 0) continue; } - num = UnScaleByZoom(num + ScaleByZoom(1, Tzoom) - 1, Tzoom); + num = UnScaleByZoom(num, Tzoom); switch (Tmode) { case BM_COLOUR_REMAP: diff --git a/src/zoom.hpp b/src/zoom.hpp index c80f094bf..500182d71 100644 --- a/src/zoom.hpp +++ b/src/zoom.hpp @@ -37,14 +37,14 @@ static inline int ScaleByZoom(int value, ZoomLevel zoom) { if (zoom == ZOOM_LVL_NORMAL) return value; int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; - return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> -izoom; + return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom)) >> -izoom; } static inline int UnScaleByZoom(int value, ZoomLevel zoom) { if (zoom == ZOOM_LVL_NORMAL) return value; int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; - return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << -izoom; + return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom; } #endif /* ZOOM_HPP */ |