diff options
Diffstat (limited to 'vcl/source/gdi/region.cxx')
| -rw-r--r-- | vcl/source/gdi/region.cxx | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/vcl/source/gdi/region.cxx b/vcl/source/gdi/region.cxx index 9cced7de3651..db44bec521fe 100644 --- a/vcl/source/gdi/region.cxx +++ b/vcl/source/gdi/region.cxx @@ -154,7 +154,8 @@ void ImplAddMissingBands ( // We still have to cover two cases: // 1. The region does not yet contain any bands. // 2. The intervall nTop->nBottom extends past the bottom most band. - if (nCurrentTop < nBottom && (pBand==NULL || nBottom>pBand->mnYBottom)) + if (nCurrentTop <= nBottom + && (pBand==NULL || nBottom>pBand->mnYBottom)) { // When there is no previous band then the new one will be the // first. Otherwise the new band is inserted behind the last band. @@ -233,8 +234,9 @@ ImplRegion* ImplRectilinearPolygonToBands (const PolyPolygon& rPolyPoly) ImplRegionBand* pTopBand = pBand; // If necessary split the band at nTop so that nTop is contained // in the lower band. - if ( // Prevent the current band from becoming 0 pixel high - pBand->mnYTop<nTop + if (pBand!=NULL + // Prevent the current band from becoming 0 pixel high + && pBand->mnYTop<nTop // this allows the lowest pixel of the band to be split off && pBand->mnYBottom>=nTop // do not split a band that is just one pixel high @@ -249,8 +251,9 @@ ImplRegion* ImplRectilinearPolygonToBands (const PolyPolygon& rPolyPoly) pBand = pBand->mpNextBand; // The lowest band may have to be split at nBottom so that // nBottom itself remains in the upper band. - if ( // allow the current band becoming 1 pixel high - pBand->mnYTop<=nBottom + if (pBand!=NULL + // allow the current band becoming 1 pixel high + && pBand->mnYTop<=nBottom // prevent splitting off a band that is 0 pixel high && pBand->mnYBottom>nBottom // do not split a band that is just one pixel high |