[Libreoffice-commits] core.git: Branch 'private/swe/libreoffice-5-2+backports' - vcl/headless vcl/source

[Vasily Melenchuk]

 vcl/headless/svpgdi.cxx    |   31 +++++++++++++++++++++++++++++++
 vcl/source/gdi/pngread.cxx |   10 +---------
 2 files changed, 32 insertions(+), 9 deletions(-)

New commits:
commit 355a6ecfe000677e09ec959b52a7b29d1e8fc8e2
Author: Vasily Melenchuk <Vasily.Melenchuk at cib.de>
Date:   Tue Feb 27 19:08:35 2018 +0300

    tdf#115297: alternative fix for displaying 1bit images
    
    Previous fixes for 1bit monochrome / paletted images produced some
    regressions, so here is attempt to fix problem at the root.
    
    Partially reverted 66dbd4da3afcadb1393daf9be9cecff71b86509a and
    fixed in a different way without tdf#115297, tdf#114726 and related.
    
    Reviewed-on: https://gerrit.libreoffice.org/50454
    Reviewed-by: Thorsten Behrens <Thorsten.Behrens at CIB.de>
    Tested-by: Thorsten Behrens <Thorsten.Behrens at CIB.de>
    (cherry picked from commit 25cd843664919974f0d21ca7a0b02cc43e9eeabb)
    
    Conflicts:
            vcl/headless/svpgdi.cxx
            vcl/source/gdi/pngread.cxx
    
    Change-Id: I6849ed5ac41770ba905c930065c80e58509dba2e

diff --git a/vcl/headless/svpgdi.cxx b/vcl/headless/svpgdi.cxx
index 11f408aaf773..4a3874f4586b 100644
--- a/vcl/headless/svpgdi.cxx
+++ b/vcl/headless/svpgdi.cxx
@@ -1014,8 +1014,39 @@ void SvpSalGraphics::copyBits( const SalTwoRect& rTR,
         cairo_surface_destroy(pCopy);
 }
 
+namespace
+{
+    bool isBlackWhite(const SalBitmap& rBitmap)
+    {
+        const SvpSalBitmap& rSrcBmp = static_cast<const SvpSalBitmap&>(rBitmap);
+        const BitmapBuffer * pSourceBuffer = rSrcBmp.GetBuffer();
+        const BitmapPalette & rPalette = pSourceBuffer->maPalette;
+
+        return (
+            rPalette.GetEntryCount() < 2 ||
+
+            (rPalette.GetEntryCount() == 2 &&
+            rPalette[0] == Color(COL_BLACK) &&
+            rPalette[1] == Color(COL_WHITE) ) ||
+
+            (rPalette.GetEntryCount() == 2 &&
+            rPalette[1] == Color(COL_BLACK) &&
+            rPalette[0] == Color(COL_WHITE) )
+            );
+    }
+}
+
 void SvpSalGraphics::drawBitmap(const SalTwoRect& rTR, const SalBitmap& rSourceBitmap)
 {
+    if (rSourceBitmap.GetBitCount() == 1 && isBlackWhite(rSourceBitmap))
+    {
+        // This way we draw only monochrome b/w bitmaps
+        MaskHelper aMask(rSourceBitmap);
+        cairo_surface_t* source = aMask.getMask();
+        copySource(rTR, source);
+        return;
+    }
+
     SourceHelper aSurface(rSourceBitmap);
     cairo_surface_t* source = aSurface.getSurface();
     if (!source)
diff --git a/vcl/source/gdi/pngread.cxx b/vcl/source/gdi/pngread.cxx
index 6850e13bc802..85de3b6cff8a 100644
--- a/vcl/source/gdi/pngread.cxx
+++ b/vcl/source/gdi/pngread.cxx
@@ -548,19 +548,11 @@ bool PNGReaderImpl::ImplReadHeader( const Size& rPreviewSizeHint )
         {
             switch ( mnPngDepth )
             {
-                case 1 :
-#if defined(UNX) && !defined(MAXOSX)
-                    // 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
                     mbPalette = false;
                     break;
+                case 1 :
                 case 4 :
                 case 8 :
                     mbPalette = false;