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

Change-Id: Iba64eb42965c86ca5655b9a105ef3f397e033ecf

3 files changed, 42 insertions, 0 deletions

diff --git a/vcl/win/source/gdi/gdiimpl.cxx b/vcl/win/source/gdi/gdiimpl.cxx
index 03ad55465fd2..8a4b39062363 100644
--- a/vcl/win/source/gdi/gdiimpl.cxx
+++ b/vcl/win/source/gdi/gdiimpl.cxx
@@ -2252,6 +2252,22 @@ bool WinSalGraphicsImpl::tryDrawBitmapGdiPlus(const SalTwoRect& rTR, const SalBi
     return false;
 }
 
+bool WinSalGraphicsImpl::blendBitmap(
+    const SalTwoRect&,
+    const SalBitmap&)
+{
+    return false;
+}
+
+bool WinSalGraphicsImpl::blendAlphaBitmap(
+    const SalTwoRect&,
+    const SalBitmap&,
+    const SalBitmap&,
+    const SalBitmap&)
+{
+    return false;
+}
+
 bool WinSalGraphicsImpl::drawAlphaBitmap(
     const SalTwoRect& rTR,
     const SalBitmap& rSrcBitmap,
diff --git a/vcl/win/source/gdi/gdiimpl.hxx b/vcl/win/source/gdi/gdiimpl.hxx
index a1c781a36676..ded35ac85041 100644
--- a/vcl/win/source/gdi/gdiimpl.hxx
+++ b/vcl/win/source/gdi/gdiimpl.hxx
@@ -172,6 +172,16 @@ public:
                 void* pPtr,
                 sal_uLong nSize ) SAL_OVERRIDE;
 
+    virtual bool blendBitmap(
+                const SalTwoRect&,
+                const SalBitmap& rBitmap ) SAL_OVERRIDE;
+
+    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/win/source/gdi/salgdi_gdiplus.cxx b/vcl/win/source/gdi/salgdi_gdiplus.cxx
index 65dbdd84acec..094a05c62b16 100644
--- a/vcl/win/source/gdi/salgdi_gdiplus.cxx
+++ b/vcl/win/source/gdi/salgdi_gdiplus.cxx
@@ -43,6 +43,22 @@ bool WinSalGraphics::drawPolyLine(
             eLineJoin, eLineCap);
 }
 
+bool WinSalGraphics::blendBitmap(
+    const SalTwoRect& rTR,
+    const SalBitmap& rBmp)
+{
+    return mpImpl->blendBitmap(rTR, rBmp);
+}
+
+bool WinSalGraphics::blendAlphaBitmap(
+    const SalTwoRect& rTR,
+    const SalBitmap& rSrcBmp,
+    const SalBitmap& rMaskBmp,
+    const SalBitmap& rAlphaBmp)
+{
+    return mpImpl->blendAlphaBitmap(rTR, rSrcBmp, rMaskBmp, rAlphaBmp);
+}
+
 bool WinSalGraphics::drawAlphaBitmap(
     const SalTwoRect& rTR,
     const SalBitmap& rSrcBitmap,