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authorTor Lillqvist <tml@collabora.com>2017-11-20 14:23:17 +0200
committerTor Lillqvist <tml@collabora.com>2017-11-20 16:59:02 +0100
commit66dbd4da3afcadb1393daf9be9cecff71b86509a (patch)
treee5a560e6a2bfbd119c0eaaf26d356c065a82ea5a /vcl/source
parent94c76b6d267ba72177e1144b408b0343d8385c37 (diff)
tdf#113918: Workaround: Load 1bpp indexed PNG as 8bpp indexed Bitmap
The alternative, to fix the X11 disaster area used by the gen, gtk, and kde4 VCL plugins, seemed more difficult. Somebody else with more time, feel free to revert and do that instead. Change-Id: I068ea27224ba98be25e01671546137ddd70691a7 Reviewed-on: https://gerrit.libreoffice.org/44957 Reviewed-by: Tor Lillqvist <tml@collabora.com> Tested-by: Tor Lillqvist <tml@collabora.com>
Diffstat (limited to 'vcl/source')
-rw-r--r--vcl/source/gdi/pngread.cxx31
1 files changed, 28 insertions, 3 deletions
diff --git a/vcl/source/gdi/pngread.cxx b/vcl/source/gdi/pngread.cxx
index f2169e01d337..bc218f8d9964 100644
--- a/vcl/source/gdi/pngread.cxx
+++ b/vcl/source/gdi/pngread.cxx
@@ -531,10 +531,19 @@ bool PNGReaderImpl::ImplReadHeader( const Size& rPreviewSizeHint )
{
switch ( mnPngDepth )
{
+ case 1 :
+#if defined(UNX) && !defined(MACOSX)
+ // 1bpp indexed images are so badly mishandled by rest of LO on X11 that we
+ // don't even bother, and turn them into 8bpp indexed ones with just two palette
+ // entries instead.
+ mnTargetDepth = 8; // we have to expand the bitmap
+#endif
+ mbPalette = false;
+ break;
case 2 :
mnTargetDepth = 4; // we have to expand the bitmap
- SAL_FALLTHROUGH;
- case 1 :
+ mbPalette = false;
+ break;
case 4 :
case 8 :
mbPalette = false;
@@ -1327,7 +1336,7 @@ void PNGReaderImpl::ImplDrawScanline( sal_uInt32 nXStart, sal_uInt32 nXAdd )
}
else // neither alpha nor transparency
{
- if ( mnPngDepth == 8 ) // maybe the source is a 16 bit grayscale
+ if ( mnPngDepth == 8 ) // maybe the source is a 16 bit grayscale or 1 bit indexed
{
if( nXAdd == 1 && mnPreviewShift == 0 ) // copy raw line data if possible
{
@@ -1342,6 +1351,22 @@ void PNGReaderImpl::ImplDrawScanline( sal_uInt32 nXStart, sal_uInt32 nXAdd )
ImplSetPixel( nY, nX, *pTmp++ );
}
}
+ else if (mnPngDepth == 1 )
+ {
+ for ( long nX = nXStart, nShift = 0; nX < maOrigSize.Width(); nX += nXAdd )
+ {
+ nShift = (nShift - 1) & 7;
+
+ sal_uInt8 nCol;
+ if ( nShift == 0 )
+ nCol = *(pTmp++);
+ else
+ nCol = static_cast<sal_uInt8>( *pTmp >> nShift );
+ nCol &= 1;
+
+ ImplSetPixel( nY, nX, nCol );
+ }
+ }
else
{
for ( long nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 2 )