diff options
Diffstat (limited to 'vcl/source/gdi/bitmapex.cxx')
| -rw-r--r-- | vcl/source/gdi/bitmapex.cxx | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/vcl/source/gdi/bitmapex.cxx b/vcl/source/gdi/bitmapex.cxx index cfcac8851089..4e2ed20a7966 100644 --- a/vcl/source/gdi/bitmapex.cxx +++ b/vcl/source/gdi/bitmapex.cxx @@ -47,6 +47,7 @@ #include <tools/rc.h> #endif #include <vcl/svapp.hxx> +#include <vcl/bmpacc.hxx> // ------------ // - BitmapEx - @@ -761,6 +762,78 @@ void BitmapEx::Draw( OutputDevice* pOutDev, // ------------------------------------------------------------------ +sal_uInt8 BitmapEx::GetTransparency(sal_Int32 nX, sal_Int32 nY) const +{ + sal_uInt8 nTransparency(0xff); + + if(!aBitmap.IsEmpty()) + { + if(nX >= 0 && nX < aBitmapSize.Width() && nY >= 0 && nY < aBitmapSize.Height()) + { + switch(eTransparent) + { + case TRANSPARENT_NONE: + { + // not transparent, ergo all covered + nTransparency = 0x00; + break; + } + case TRANSPARENT_COLOR: + { + Bitmap aTestBitmap(aBitmap); + BitmapReadAccess* pRead = aTestBitmap.AcquireReadAccess(); + + if(pRead) + { + const Color aColor = pRead->GetColor(nY, nX); + + // if color is not equal to TransparentColor, we are not transparent + if(aColor != aTransparentColor) + { + nTransparency = 0x00; + } + + aTestBitmap.ReleaseAccess(pRead); + } + break; + } + case TRANSPARENT_BITMAP: + { + if(!aMask.IsEmpty()) + { + Bitmap aTestBitmap(aMask); + BitmapReadAccess* pRead = aTestBitmap.AcquireReadAccess(); + + if(pRead) + { + const BitmapColor aBitmapColor(pRead->GetPixel(nY, nX)); + + if(bAlpha) + { + nTransparency = aBitmapColor.GetIndex(); + } + else + { + if(0x00 != aBitmapColor.GetIndex()) + { + nTransparency = 0x00; + } + } + + aTestBitmap.ReleaseAccess(pRead); + } + } + break; + } + } + } + } + + return nTransparency; +} + +// ------------------------------------------------------------------ + SvStream& operator<<( SvStream& rOStm, const BitmapEx& rBitmapEx ) { rBitmapEx.aBitmap.Write( rOStm ); |