diff options
Diffstat (limited to 'vcl/source/bitmap/salbmp.cxx')
| -rw-r--r-- | vcl/source/bitmap/salbmp.cxx | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/vcl/source/bitmap/salbmp.cxx b/vcl/source/bitmap/salbmp.cxx index a84fc63f4042..3e8f0b255d2d 100644 --- a/vcl/source/bitmap/salbmp.cxx +++ b/vcl/source/bitmap/salbmp.cxx @@ -62,11 +62,19 @@ void SalBitmap::updateChecksum() const break; } } - if( pBuf->mnScanlineSize == lineBitsCount / 8 ) - nCrc = rtl_crc32(nCrc, pBuf->mpBits, pBuf->mnScanlineSize * pBuf->mnHeight); - else // Do not include padding with undefined content in the checksum. - for( tools::Long y = 0; y < pBuf->mnHeight; ++y ) + if (pBuf->meDirection == ScanlineDirection::TopDown) + { + if( pBuf->mnScanlineSize == lineBitsCount / 8 ) + nCrc = rtl_crc32(nCrc, pBuf->mpBits, pBuf->mnScanlineSize * pBuf->mnHeight); + else // Do not include padding with undefined content in the checksum. + for( tools::Long y = 0; y < pBuf->mnHeight; ++y ) + nCrc = scanlineChecksum(nCrc, pBuf->mpBits + y * pBuf->mnScanlineSize, lineBitsCount, extraBitsMask); + } + else // Compute checksum in the order of scanlines, to make it consistent between different bitmap implementations. + { + for( tools::Long y = pBuf->mnHeight - 1; y >= 0; --y ) nCrc = scanlineChecksum(nCrc, pBuf->mpBits + y * pBuf->mnScanlineSize, lineBitsCount, extraBitsMask); + } pThis->ReleaseBuffer(pBuf, BitmapAccessMode::Read); pThis->mnChecksum = nCrc; pThis->mbChecksumValid = true; |