diff options
Diffstat (limited to 'vcl/source/bitmap/BitmapTools.cxx')
| -rw-r--r-- | vcl/source/bitmap/BitmapTools.cxx | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapTools.cxx b/vcl/source/bitmap/BitmapTools.cxx index f29989b9cab2..e750a63880e5 100644 --- a/vcl/source/bitmap/BitmapTools.cxx +++ b/vcl/source/bitmap/BitmapTools.cxx @@ -26,10 +26,12 @@ #include <vcl/svapp.hxx> #include <vcl/salbtype.hxx> #include <vcl/bitmapaccess.hxx> +#include <vcl/virdev.hxx> #if ENABLE_CAIRO_CANVAS #include <cairo.h> #endif #include <tools/diagnose_ex.h> +#include <tools/fract.hxx> using namespace css; @@ -537,6 +539,94 @@ void DrawAlphaBitmapAndAlphaGradient(BitmapEx & rBitmapEx, bool bFixedTransparen rBitmapEx = BitmapEx(rBitmapEx.GetBitmap(), aOldMask); } + +void DrawAndClipBitmap(const Point& rPos, const Size& rSize, const BitmapEx& rBitmap, BitmapEx & aBmpEx, basegfx::B2DPolyPolygon const & rClipPath) +{ + VclPtrInstance< VirtualDevice > pVDev; + MapMode aMapMode( MapUnit::Map100thMM ); + aMapMode.SetOrigin( Point( -rPos.X(), -rPos.Y() ) ); + const Size aOutputSizePixel( pVDev->LogicToPixel( rSize, aMapMode ) ); + const Size aSizePixel( rBitmap.GetSizePixel() ); + if ( aOutputSizePixel.Width() && aOutputSizePixel.Height() ) + { + aMapMode.SetScaleX( Fraction( aSizePixel.Width(), aOutputSizePixel.Width() ) ); + aMapMode.SetScaleY( Fraction( aSizePixel.Height(), aOutputSizePixel.Height() ) ); + } + pVDev->SetMapMode( aMapMode ); + pVDev->SetOutputSizePixel( aSizePixel ); + pVDev->SetFillColor( COL_BLACK ); + const tools::PolyPolygon aClip( rClipPath ); + pVDev->DrawPolyPolygon( aClip ); + + // #i50672# Extract whole VDev content (to match size of rBitmap) + pVDev->EnableMapMode( false ); + const Bitmap aVDevMask(pVDev->GetBitmap(Point(), aSizePixel)); + + if(aBmpEx.IsTransparent()) + { + // bitmap already uses a Mask or Alpha, we need to blend that with + // the new masking in pVDev + if(aBmpEx.IsAlpha()) + { + // need to blend in AlphaMask quality (8Bit) + AlphaMask fromVDev(aVDevMask); + AlphaMask fromBmpEx(aBmpEx.GetAlpha()); + AlphaMask::ScopedReadAccess pR(fromVDev); + AlphaMask::ScopedWriteAccess pW(fromBmpEx); + + if(pR && pW) + { + const long nWidth(std::min(pR->Width(), pW->Width())); + const long nHeight(std::min(pR->Height(), pW->Height())); + + for(long nY(0); nY < nHeight; nY++) + { + Scanline pScanlineR = pR->GetScanline( nY ); + Scanline pScanlineW = pW->GetScanline( nY ); + for(long nX(0); nX < nWidth; nX++) + { + const sal_uInt8 nIndR(pR->GetIndexFromData(pScanlineR, nX)); + const sal_uInt8 nIndW(pW->GetIndexFromData(pScanlineW, nX)); + + // these values represent transparency (0 == no, 255 == fully transparent), + // so to blend these we have to multiply the inverse (opacity) + // and re-invert the result to transparence + const sal_uInt8 nCombined(0x00ff - (((0x00ff - nIndR) * (0x00ff - nIndW)) >> 8)); + + pW->SetPixelOnData(pScanlineW, nX, BitmapColor(nCombined)); + } + } + } + + pR.reset(); + pW.reset(); + aBmpEx = BitmapEx(aBmpEx.GetBitmap(), fromBmpEx); + } + else + { + // need to blend in Mask quality (1Bit) + Bitmap aMask(aVDevMask.CreateMask(COL_WHITE)); + + if ( rBitmap.GetTransparentColor() == COL_WHITE ) + { + aMask.CombineSimple( rBitmap.GetMask(), BmpCombine::Or ); + } + else + { + aMask.CombineSimple( rBitmap.GetMask(), BmpCombine::And ); + } + + aBmpEx = BitmapEx( rBitmap.GetBitmap(), aMask ); + } + } + else + { + // no mask yet, create and add new mask. For better quality, use Alpha, + // this allows the drawn mask being processed with AntiAliasing (AAed) + aBmpEx = BitmapEx(rBitmap.GetBitmap(), aVDevMask); + } +} + }} // end vcl::bitmap /* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |