vcl: Add support for backend-dependent blending of bitmaps (mask and alpha)

Change-Id: Iba64eb42965c86ca5655b9a105ef3f397e033ecf

3 files changed, 38 insertions, 0 deletions

diff --git a/vcl/unx/generic/gdi/gdiimpl.cxx b/vcl/unx/generic/gdi/gdiimpl.cxx
index ee7e596fbc95..bcf8d0523abd 100644
--- a/vcl/unx/generic/gdi/gdiimpl.cxx
+++ b/vcl/unx/generic/gdi/gdiimpl.cxx
@@ -821,6 +821,18 @@ void X11SalGraphicsImpl::drawMaskedBitmap( const SalTwoRect& rPosAry,
         XFreePixmap( pXDisp, aBG );
 }
 
+bool X11SalGraphicsImpl::blendBitmap( const SalTwoRect&,
+    const SalBitmap& )
+{
+    return false;
+}
+
+bool X11SalGraphicsImpl::blendAlphaBitmap( const SalTwoRect&,
+    const SalBitmap&, const SalBitmap&, const SalBitmap& )
+{
+    return false;
+}
+
 bool X11SalGraphicsImpl::drawAlphaBitmap( const SalTwoRect& rTR,
     const SalBitmap& rSrcBitmap, const SalBitmap& rAlphaBmp )
 {
diff --git a/vcl/unx/generic/gdi/gdiimpl.hxx b/vcl/unx/generic/gdi/gdiimpl.hxx
index 2d9294a629d9..20c995fa6a7e 100644
--- a/vcl/unx/generic/gdi/gdiimpl.hxx
+++ b/vcl/unx/generic/gdi/gdiimpl.hxx
@@ -225,6 +225,18 @@ public:
                 void* pPtr,
                 sal_uLong nSize ) SAL_OVERRIDE;
 
+    /** Blend bitmap with color channels */
+    virtual bool blendBitmap(
+                const SalTwoRect&,
+                const SalBitmap& rBitmap ) SAL_OVERRIDE;
+
+    /** Render bitmap by blending using the mask and alpha channel */
+    virtual bool blendAlphaBitmap(
+                const SalTwoRect&,
+                const SalBitmap& rSrcBitmap,
+                const SalBitmap& rMaskBitmap,
+                const SalBitmap& rAlphaBitmap ) SAL_OVERRIDE;
+
     /** Render bitmap with alpha channel
 
         @param rSourceBitmap
diff --git a/vcl/unx/generic/gdi/salgdi2.cxx b/vcl/unx/generic/gdi/salgdi2.cxx
index 9ef50b87c747..b848d660447b 100644
--- a/vcl/unx/generic/gdi/salgdi2.cxx
+++ b/vcl/unx/generic/gdi/salgdi2.cxx
@@ -167,6 +167,20 @@ void X11SalGraphics::copyArea ( long nDestX,    long nDestY,
     mpImpl->copyArea( nDestX, nDestY, nSrcX, nSrcY, nSrcWidth, nSrcHeight, n );
 }
 
+bool X11SalGraphics::blendBitmap( const SalTwoRect& rTR,
+                                  const SalBitmap& rBitmap )
+{
+    return mpImpl->blendBitmap( rTR, rBitmap );
+}
+
+bool X11SalGraphics::blendAlphaBitmap( const SalTwoRect& rTR,
+                                       const SalBitmap& rSrcBitmap,
+                                       const SalBitmap& rMaskBitmap,
+                                       const SalBitmap& rAlphaBitmap )
+{
+    return mpImpl->blendAlphaBitmap( rTR, rSrcBitmap, rMaskBitmap, rAlphaBitmap );
+}
+
 void X11SalGraphics::drawBitmap( const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap )
 {
     mpImpl->drawBitmap( rPosAry, rSalBitmap );