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-rw-r--r--vcl/source/bitmap/BitmapTools.cxx1307
1 files changed, 1307 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapTools.cxx b/vcl/source/bitmap/BitmapTools.cxx
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index 000000000..da9a88bf6
--- /dev/null
+++ b/vcl/source/bitmap/BitmapTools.cxx
@@ -0,0 +1,1307 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#include <sal/config.h>
+
+#include <array>
+#include <utility>
+
+#include <tools/helpers.hxx>
+#include <vcl/BitmapTools.hxx>
+
+#include <sal/log.hxx>
+#include <comphelper/processfactory.hxx>
+#include <comphelper/seqstream.hxx>
+#include <vcl/canvastools.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+
+#include <com/sun/star/graphic/SvgTools.hpp>
+#include <com/sun/star/graphic/Primitive2DTools.hpp>
+
+#include <drawinglayer/primitive2d/baseprimitive2d.hxx>
+
+#include <com/sun/star/rendering/XIntegerReadOnlyBitmap.hpp>
+
+#include <vcl/dibtools.hxx>
+#include <vcl/settings.hxx>
+#include <vcl/svapp.hxx>
+#include <vcl/virdev.hxx>
+#if ENABLE_CAIRO_CANVAS
+#include <cairo.h>
+#endif
+#include <tools/diagnose_ex.h>
+#include <tools/fract.hxx>
+#include <tools/stream.hxx>
+#include <bitmap/BitmapWriteAccess.hxx>
+
+using namespace css;
+
+using drawinglayer::primitive2d::Primitive2DSequence;
+using drawinglayer::primitive2d::Primitive2DReference;
+
+namespace vcl::bitmap
+{
+
+BitmapEx loadFromName(const OUString& rFileName, const ImageLoadFlags eFlags)
+{
+ bool bSuccess = true;
+ OUString aIconTheme;
+ BitmapEx aBitmapEx;
+ try
+ {
+ aIconTheme = Application::GetSettings().GetStyleSettings().DetermineIconTheme();
+ ImageTree::get().loadImage(rFileName, aIconTheme, aBitmapEx, true, eFlags);
+ }
+ catch (...)
+ {
+ bSuccess = false;
+ }
+
+ SAL_WARN_IF(!bSuccess, "vcl", "vcl::bitmap::loadFromName : could not load image " << rFileName << " via icon theme " << aIconTheme);
+
+ return aBitmapEx;
+}
+
+void loadFromSvg(SvStream& rStream, const OUString& sPath, BitmapEx& rBitmapEx, double fScalingFactor)
+{
+ uno::Reference<uno::XComponentContext> xContext(comphelper::getProcessComponentContext());
+ const uno::Reference<graphic::XSvgParser> xSvgParser = graphic::SvgTools::create(xContext);
+
+ std::size_t nSize = rStream.remainingSize();
+ std::vector<sal_Int8> aBuffer(nSize + 1);
+ rStream.ReadBytes(aBuffer.data(), nSize);
+ aBuffer[nSize] = 0;
+
+ uno::Sequence<sal_Int8> aData(aBuffer.data(), nSize + 1);
+ uno::Reference<io::XInputStream> aInputStream(new comphelper::SequenceInputStream(aData));
+
+ const Primitive2DSequence aPrimitiveSequence = xSvgParser->getDecomposition(aInputStream, sPath);
+
+ if (!aPrimitiveSequence.hasElements())
+ return;
+
+ uno::Sequence<beans::PropertyValue> aViewParameters;
+
+ geometry::RealRectangle2D aRealRect;
+ basegfx::B2DRange aRange;
+ for (css::uno::Reference<css::graphic::XPrimitive2D> const & xReference : aPrimitiveSequence)
+ {
+ if (xReference.is())
+ {
+ aRealRect = xReference->getRange(aViewParameters);
+ aRange.expand(basegfx::B2DRange(aRealRect.X1, aRealRect.Y1, aRealRect.X2, aRealRect.Y2));
+ }
+ }
+
+ aRealRect.X1 = aRange.getMinX();
+ aRealRect.Y1 = aRange.getMinY();
+ aRealRect.X2 = aRange.getMaxX();
+ aRealRect.Y2 = aRange.getMaxY();
+
+ double nDPI = 96 * fScalingFactor;
+
+ const css::uno::Reference<css::graphic::XPrimitive2DRenderer> xPrimitive2DRenderer = css::graphic::Primitive2DTools::create(xContext);
+ const css::uno::Reference<css::rendering::XBitmap> xBitmap(
+ xPrimitive2DRenderer->rasterize(aPrimitiveSequence, aViewParameters, nDPI, nDPI, aRealRect, 256*256));
+
+ if (xBitmap.is())
+ {
+ const css::uno::Reference<css::rendering::XIntegerReadOnlyBitmap> xIntBmp(xBitmap, uno::UNO_QUERY_THROW);
+ rBitmapEx = vcl::unotools::bitmapExFromXBitmap(xIntBmp);
+ }
+
+}
+
+/** Copy block of image data into the bitmap.
+ Assumes that the Bitmap has been constructed with the desired size.
+
+ @param pData
+ The block of data to copy
+ @param nStride
+ The number of bytes in a scanline, must >= (width * nBitCount / 8)
+ @param bReversColors
+ In case the endianness of pData is wrong, you could reverse colors
+*/
+BitmapEx CreateFromData(sal_uInt8 const *pData, sal_Int32 nWidth, sal_Int32 nHeight,
+ sal_Int32 nStride, vcl::PixelFormat ePixelFormat,
+ bool bReversColors, bool bReverseAlpha)
+{
+ auto nBitCount = sal_uInt16(ePixelFormat);
+
+ assert(nStride >= (nWidth * nBitCount / 8));
+ assert(nBitCount == 1 || nBitCount == 24 || nBitCount == 32);
+
+ Bitmap aBmp(Size(nWidth, nHeight), ePixelFormat);
+
+ BitmapScopedWriteAccess pWrite(aBmp);
+ assert(pWrite.get());
+ if( !pWrite )
+ return BitmapEx();
+ std::unique_ptr<AlphaMask> pAlphaMask;
+ AlphaScopedWriteAccess xMaskAcc;
+ if (nBitCount == 32)
+ {
+ pAlphaMask.reset( new AlphaMask( Size(nWidth, nHeight) ) );
+ xMaskAcc = AlphaScopedWriteAccess(*pAlphaMask);
+ }
+ if (nBitCount == 1)
+ {
+ for( tools::Long y = 0; y < nHeight; ++y )
+ {
+ sal_uInt8 const *p = pData + y * nStride / 8;
+ Scanline pScanline = pWrite->GetScanline(y);
+ for (tools::Long x = 0; x < nWidth; ++x)
+ {
+ int bitIndex = (y * nStride + x) % 8;
+
+ pWrite->SetPixelOnData(pScanline, x, BitmapColor((*p >> bitIndex) & 1));
+ }
+ }
+ }
+ else
+ {
+ for( tools::Long y = 0; y < nHeight; ++y )
+ {
+ sal_uInt8 const *p = pData + (y * nStride);
+ Scanline pScanline = pWrite->GetScanline(y);
+ for (tools::Long x = 0; x < nWidth; ++x)
+ {
+ BitmapColor col;
+ if ( bReversColors )
+ col = BitmapColor( p[2], p[1], p[0] );
+ else
+ col = BitmapColor( p[0], p[1], p[2] );
+ pWrite->SetPixelOnData(pScanline, x, col);
+ p += nBitCount/8;
+ }
+ if (nBitCount == 32)
+ {
+ p = pData + (y * nStride) + 3;
+ Scanline pMaskScanLine = xMaskAcc->GetScanline(y);
+ for (tools::Long x = 0; x < nWidth; ++x)
+ {
+ const sal_uInt8 nValue = bReverseAlpha ? 0xff - *p : *p;
+ xMaskAcc->SetPixelOnData(pMaskScanLine, x, BitmapColor(nValue));
+ p += 4;
+ }
+ }
+ }
+ }
+ if (nBitCount == 32)
+ return BitmapEx(aBmp, *pAlphaMask);
+ else
+ return BitmapEx(aBmp);
+}
+
+/** Copy block of image data into the bitmap.
+ Assumes that the Bitmap has been constructed with the desired size.
+*/
+BitmapEx CreateFromData( RawBitmap&& rawBitmap )
+{
+ auto nBitCount = rawBitmap.GetBitCount();
+ assert( nBitCount == 24 || nBitCount == 32);
+
+ auto ePixelFormat = vcl::PixelFormat::INVALID;
+
+ if (nBitCount == 24)
+ ePixelFormat = vcl::PixelFormat::N24_BPP;
+ else if (nBitCount == 32)
+ ePixelFormat = vcl::PixelFormat::N32_BPP;
+
+ assert(ePixelFormat != vcl::PixelFormat::INVALID);
+
+ Bitmap aBmp(rawBitmap.maSize, ePixelFormat);
+
+ BitmapScopedWriteAccess pWrite(aBmp);
+ assert(pWrite.get());
+ if( !pWrite )
+ return BitmapEx();
+ std::unique_ptr<AlphaMask> pAlphaMask;
+ AlphaScopedWriteAccess xMaskAcc;
+ if (nBitCount == 32)
+ {
+ pAlphaMask.reset( new AlphaMask( rawBitmap.maSize ) );
+ xMaskAcc = AlphaScopedWriteAccess(*pAlphaMask);
+ }
+
+ auto nHeight = rawBitmap.maSize.getHeight();
+ auto nWidth = rawBitmap.maSize.getWidth();
+ auto nStride = nWidth * nBitCount / 8;
+ for( tools::Long y = 0; y < nHeight; ++y )
+ {
+ sal_uInt8 const *p = rawBitmap.mpData.get() + (y * nStride);
+ Scanline pScanline = pWrite->GetScanline(y);
+ for (tools::Long x = 0; x < nWidth; ++x)
+ {
+ BitmapColor col(p[0], p[1], p[2]);
+ pWrite->SetPixelOnData(pScanline, x, col);
+ p += nBitCount/8;
+ }
+ if (nBitCount == 32)
+ {
+ p = rawBitmap.mpData.get() + (y * nStride) + 3;
+ Scanline pMaskScanLine = xMaskAcc->GetScanline(y);
+ for (tools::Long x = 0; x < nWidth; ++x)
+ {
+ xMaskAcc->SetPixelOnData(pMaskScanLine, x, BitmapColor(255 - *p));
+ p += 4;
+ }
+ }
+ }
+ if (nBitCount == 32)
+ return BitmapEx(aBmp, *pAlphaMask);
+ else
+ return BitmapEx(aBmp);
+}
+
+#if ENABLE_CAIRO_CANVAS
+BitmapEx* CreateFromCairoSurface(Size aSize, cairo_surface_t * pSurface)
+{
+ // FIXME: if we could teach VCL/ about cairo handles, life could
+ // be significantly better here perhaps.
+
+#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 12, 0)
+ cairo_surface_t *pPixels = cairo_surface_create_similar_image(pSurface,
+#else
+ cairo_surface_t *pPixels = cairo_image_surface_create(
+#endif
+ CAIRO_FORMAT_ARGB32, aSize.Width(), aSize.Height());
+ cairo_t *pCairo = cairo_create( pPixels );
+ if( !pPixels || !pCairo || cairo_status(pCairo) != CAIRO_STATUS_SUCCESS )
+ return nullptr;
+
+ // suck ourselves from the X server to this buffer so then we can fiddle with
+ // Alpha to turn it into the ultra-lame vcl required format and then push it
+ // all back again later at vast expense [ urgh ]
+ cairo_set_source_surface( pCairo, pSurface, 0, 0 );
+ cairo_set_operator( pCairo, CAIRO_OPERATOR_SOURCE );
+ cairo_paint( pCairo );
+
+ Bitmap aRGB(aSize, vcl::PixelFormat::N24_BPP);
+ ::AlphaMask aMask( aSize );
+
+ BitmapScopedWriteAccess pRGBWrite(aRGB);
+ assert(pRGBWrite);
+ if (!pRGBWrite)
+ return nullptr;
+
+ AlphaScopedWriteAccess pMaskWrite(aMask);
+ assert(pMaskWrite);
+ if (!pMaskWrite)
+ return nullptr;
+
+ cairo_surface_flush(pPixels);
+ unsigned char *pSrc = cairo_image_surface_get_data( pPixels );
+ unsigned int nStride = cairo_image_surface_get_stride( pPixels );
+#if !ENABLE_WASM_STRIP_PREMULTIPLY
+ vcl::bitmap::lookup_table const & unpremultiply_table = vcl::bitmap::get_unpremultiply_table();
+#endif
+ for( tools::Long y = 0; y < aSize.Height(); y++ )
+ {
+ sal_uInt32 *pPix = reinterpret_cast<sal_uInt32 *>(pSrc + nStride * y);
+ for( tools::Long x = 0; x < aSize.Width(); x++ )
+ {
+#if defined OSL_BIGENDIAN
+ sal_uInt8 nB = (*pPix >> 24);
+ sal_uInt8 nG = (*pPix >> 16) & 0xff;
+ sal_uInt8 nR = (*pPix >> 8) & 0xff;
+ sal_uInt8 nAlpha = *pPix & 0xff;
+#else
+ sal_uInt8 nAlpha = (*pPix >> 24);
+ sal_uInt8 nR = (*pPix >> 16) & 0xff;
+ sal_uInt8 nG = (*pPix >> 8) & 0xff;
+ sal_uInt8 nB = *pPix & 0xff;
+#endif
+ if( nAlpha != 0 && nAlpha != 255 )
+ {
+ // Cairo uses pre-multiplied alpha - we do not => re-multiply
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ nR = vcl::bitmap::unpremultiply(nAlpha, nR);
+ nG = vcl::bitmap::unpremultiply(nAlpha, nG);
+ nB = vcl::bitmap::unpremultiply(nAlpha, nB);
+#else
+ nR = unpremultiply_table[nAlpha][nR];
+ nG = unpremultiply_table[nAlpha][nG];
+ nB = unpremultiply_table[nAlpha][nB];
+#endif
+ }
+ pRGBWrite->SetPixel( y, x, BitmapColor( nR, nG, nB ) );
+ pMaskWrite->SetPixelIndex( y, x, 255 - nAlpha );
+ pPix++;
+ }
+ }
+
+ // ignore potential errors above. will get caller a
+ // uniformly white bitmap, but not that there would
+ // be error handling in calling code ...
+ ::BitmapEx *pBitmapEx = new ::BitmapEx( aRGB, aMask );
+
+ cairo_destroy( pCairo );
+ cairo_surface_destroy( pPixels );
+ return pBitmapEx;
+}
+#endif
+
+BitmapEx CanvasTransformBitmap( const BitmapEx& rBitmap,
+ const ::basegfx::B2DHomMatrix& rTransform,
+ ::basegfx::B2DRectangle const & rDestRect,
+ ::basegfx::B2DHomMatrix const & rLocalTransform )
+{
+ const Size aBmpSize( rBitmap.GetSizePixel() );
+ Bitmap aSrcBitmap( rBitmap.GetBitmap() );
+ Bitmap aSrcAlpha;
+
+ // differentiate mask and alpha channel (on-off
+ // vs. multi-level transparency)
+ if( rBitmap.IsAlpha() )
+ {
+ aSrcAlpha = rBitmap.GetAlpha().GetBitmap();
+ }
+
+ Bitmap::ScopedReadAccess pReadAccess( aSrcBitmap );
+ Bitmap::ScopedReadAccess pAlphaReadAccess( rBitmap.IsAlpha() ?
+ aSrcAlpha.AcquireReadAccess() :
+ nullptr,
+ aSrcAlpha );
+
+ if( pReadAccess.get() == nullptr ||
+ (pAlphaReadAccess.get() == nullptr && rBitmap.IsAlpha()) )
+ {
+ // TODO(E2): Error handling!
+ ENSURE_OR_THROW( false,
+ "transformBitmap(): could not access source bitmap" );
+ }
+
+ // mapping table, to translate pAlphaReadAccess' pixel
+ // values into destination alpha values (needed e.g. for
+ // paletted 1-bit masks).
+ sal_uInt8 aAlphaMap[256];
+
+ if( rBitmap.IsAlpha() )
+ {
+ // source already has alpha channel - 1:1 mapping,
+ // i.e. aAlphaMap[0]=0,...,aAlphaMap[255]=255.
+ sal_uInt8 val=0;
+ sal_uInt8* pCur=aAlphaMap;
+ sal_uInt8* const pEnd=&aAlphaMap[256];
+ while(pCur != pEnd)
+ *pCur++ = val++;
+ }
+ // else: mapping table is not used
+
+ const Size aDestBmpSize( ::basegfx::fround( rDestRect.getWidth() ),
+ ::basegfx::fround( rDestRect.getHeight() ) );
+
+ if( aDestBmpSize.IsEmpty() )
+ return BitmapEx();
+
+ Bitmap aDstBitmap(aDestBmpSize, aSrcBitmap.getPixelFormat(), &pReadAccess->GetPalette());
+ Bitmap aDstAlpha( AlphaMask( aDestBmpSize ).GetBitmap() );
+
+ {
+ // just to be on the safe side: let the
+ // ScopedAccessors get destructed before
+ // copy-constructing the resulting bitmap. This will
+ // rule out the possibility that cached accessor data
+ // is not yet written back.
+ BitmapScopedWriteAccess pWriteAccess( aDstBitmap );
+ BitmapScopedWriteAccess pAlphaWriteAccess( aDstAlpha );
+
+
+ if( pWriteAccess.get() != nullptr &&
+ pAlphaWriteAccess.get() != nullptr &&
+ rTransform.isInvertible() )
+ {
+ // we're doing inverse mapping here, i.e. mapping
+ // points from the destination bitmap back to the
+ // source
+ ::basegfx::B2DHomMatrix aTransform( rLocalTransform );
+ aTransform.invert();
+
+ // for the time being, always read as ARGB
+ for( tools::Long y=0; y<aDestBmpSize.Height(); ++y )
+ {
+ // differentiate mask and alpha channel (on-off
+ // vs. multi-level transparency)
+ if( rBitmap.IsAlpha() )
+ {
+ Scanline pScan = pWriteAccess->GetScanline( y );
+ Scanline pScanAlpha = pAlphaWriteAccess->GetScanline( y );
+ // Handling alpha and mask just the same...
+ for( tools::Long x=0; x<aDestBmpSize.Width(); ++x )
+ {
+ ::basegfx::B2DPoint aPoint(x,y);
+ aPoint *= aTransform;
+
+ const int nSrcX( ::basegfx::fround( aPoint.getX() ) );
+ const int nSrcY( ::basegfx::fround( aPoint.getY() ) );
+ if( nSrcX < 0 || nSrcX >= aBmpSize.Width() ||
+ nSrcY < 0 || nSrcY >= aBmpSize.Height() )
+ {
+ pAlphaWriteAccess->SetPixelOnData( pScanAlpha, x, BitmapColor(255) );
+ }
+ else
+ {
+ const sal_uInt8 cAlphaIdx = pAlphaReadAccess->GetPixelIndex( nSrcY, nSrcX );
+ pAlphaWriteAccess->SetPixelOnData( pScanAlpha, x, BitmapColor(aAlphaMap[ cAlphaIdx ]) );
+ pWriteAccess->SetPixelOnData( pScan, x, pReadAccess->GetPixel( nSrcY, nSrcX ) );
+ }
+ }
+ }
+ else
+ {
+ Scanline pScan = pWriteAccess->GetScanline( y );
+ Scanline pScanAlpha = pAlphaWriteAccess->GetScanline( y );
+ for( tools::Long x=0; x<aDestBmpSize.Width(); ++x )
+ {
+ ::basegfx::B2DPoint aPoint(x,y);
+ aPoint *= aTransform;
+
+ const int nSrcX( ::basegfx::fround( aPoint.getX() ) );
+ const int nSrcY( ::basegfx::fround( aPoint.getY() ) );
+ if( nSrcX < 0 || nSrcX >= aBmpSize.Width() ||
+ nSrcY < 0 || nSrcY >= aBmpSize.Height() )
+ {
+ pAlphaWriteAccess->SetPixelOnData( pScanAlpha, x, BitmapColor(255) );
+ }
+ else
+ {
+ pAlphaWriteAccess->SetPixelOnData( pScanAlpha, x, BitmapColor(0) );
+ pWriteAccess->SetPixelOnData( pScan, x, pReadAccess->GetPixel( nSrcY,
+ nSrcX ) );
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+ // TODO(E2): Error handling!
+ ENSURE_OR_THROW( false,
+ "transformBitmap(): could not access bitmap" );
+ }
+ }
+
+ return BitmapEx(aDstBitmap, AlphaMask(aDstAlpha));
+}
+
+
+void DrawAlphaBitmapAndAlphaGradient(BitmapEx & rBitmapEx, bool bFixedTransparence, float fTransparence, AlphaMask & rNewMask)
+{
+ // mix existing and new alpha mask
+ AlphaMask aOldMask;
+
+ if(rBitmapEx.IsAlpha())
+ {
+ aOldMask = rBitmapEx.GetAlpha();
+ }
+
+ {
+ AlphaScopedWriteAccess pOld(aOldMask);
+
+ assert(pOld && "Got no access to old alpha mask (!)");
+
+ const double fFactor(1.0 / 255.0);
+
+ if(bFixedTransparence)
+ {
+ const double fOpNew(1.0 - fTransparence);
+
+ for(tools::Long y(0); y < pOld->Height(); y++)
+ {
+ Scanline pScanline = pOld->GetScanline( y );
+ for(tools::Long x(0); x < pOld->Width(); x++)
+ {
+ const double fOpOld(1.0 - (pOld->GetIndexFromData(pScanline, x) * fFactor));
+ const sal_uInt8 aCol(basegfx::fround((1.0 - (fOpOld * fOpNew)) * 255.0));
+
+ pOld->SetPixelOnData(pScanline, x, BitmapColor(aCol));
+ }
+ }
+ }
+ else
+ {
+ AlphaMask::ScopedReadAccess pNew(rNewMask);
+
+ assert(pNew && "Got no access to new alpha mask (!)");
+
+ assert(pOld->Width() == pNew->Width() && pOld->Height() == pNew->Height() &&
+ "Alpha masks have different sizes (!)");
+
+ for(tools::Long y(0); y < pOld->Height(); y++)
+ {
+ Scanline pScanline = pOld->GetScanline( y );
+ for(tools::Long x(0); x < pOld->Width(); x++)
+ {
+ const double fOpOld(1.0 - (pOld->GetIndexFromData(pScanline, x) * fFactor));
+ const double fOpNew(1.0 - (pNew->GetIndexFromData(pScanline, x) * fFactor));
+ const sal_uInt8 aCol(basegfx::fround((1.0 - (fOpOld * fOpNew)) * 255.0));
+
+ pOld->SetPixelOnData(pScanline, x, BitmapColor(aCol));
+ }
+ }
+ }
+
+ }
+
+ // apply combined bitmap as mask
+ rBitmapEx = BitmapEx(rBitmapEx.GetBitmap(), aOldMask);
+}
+
+
+void DrawAndClipBitmap(const Point& rPos, const Size& rSize, const BitmapEx& rBitmap, BitmapEx & aBmpEx, basegfx::B2DPolyPolygon const & rClipPath)
+{
+ ScopedVclPtrInstance< 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.IsAlpha())
+ {
+ // bitmap already uses a Mask or Alpha, we need to blend that with
+ // the new masking in pVDev.
+ // need to blend in AlphaMask quality (8Bit)
+ AlphaMask fromVDev(aVDevMask);
+ AlphaMask fromBmpEx(aBmpEx.GetAlpha());
+ AlphaMask::ScopedReadAccess pR(fromVDev);
+ AlphaScopedWriteAccess pW(fromBmpEx);
+
+ if(pR && pW)
+ {
+ const tools::Long nWidth(std::min(pR->Width(), pW->Width()));
+ const tools::Long nHeight(std::min(pR->Height(), pW->Height()));
+
+ for(tools::Long nY(0); nY < nHeight; nY++)
+ {
+ Scanline pScanlineR = pR->GetScanline( nY );
+ Scanline pScanlineW = pW->GetScanline( nY );
+ for(tools::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
+ {
+ // 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);
+ }
+}
+
+
+css::uno::Sequence< sal_Int8 > GetMaskDIB(BitmapEx const & aBmpEx)
+{
+ if ( aBmpEx.IsAlpha() )
+ {
+ SvMemoryStream aMem;
+ WriteDIB(aBmpEx.GetAlpha().GetBitmap(), aMem, false, true);
+ return css::uno::Sequence< sal_Int8 >( static_cast<sal_Int8 const *>(aMem.GetData()), aMem.Tell() );
+ }
+
+ return css::uno::Sequence< sal_Int8 >();
+}
+
+static bool readAlpha( BitmapReadAccess const * pAlphaReadAcc, tools::Long nY, const tools::Long nWidth, unsigned char* data, tools::Long nOff )
+{
+ bool bIsAlpha = false;
+ tools::Long nX;
+ int nAlpha;
+ Scanline pReadScan;
+
+ nOff += 3;
+
+ switch( pAlphaReadAcc->GetScanlineFormat() )
+ {
+ case ScanlineFormat::N8BitPal:
+ pReadScan = pAlphaReadAcc->GetScanline( nY );
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+ BitmapColor const& rColor(
+ pAlphaReadAcc->GetPaletteColor(*pReadScan));
+ pReadScan++;
+ nAlpha = data[ nOff ] = 255 - rColor.GetIndex();
+ if( nAlpha != 255 )
+ bIsAlpha = true;
+ nOff += 4;
+ }
+ break;
+ default:
+ SAL_INFO( "canvas.cairo", "fallback to GetColor for alpha - slow, format: " << static_cast<int>(pAlphaReadAcc->GetScanlineFormat()) );
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+ nAlpha = data[ nOff ] = 255 - pAlphaReadAcc->GetColor( nY, nX ).GetIndex();
+ if( nAlpha != 255 )
+ bIsAlpha = true;
+ nOff += 4;
+ }
+ }
+
+ return bIsAlpha;
+}
+
+
+
+/**
+ * @param data will be filled with alpha data, if xBitmap is alpha/transparent image
+ * @param bHasAlpha will be set to true if resulting surface has alpha
+ **/
+void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, unsigned char*& data, bool& bHasAlpha, tools::Long& rnWidth, tools::Long& rnHeight )
+{
+ AlphaMask aAlpha = aBmpEx.GetAlpha();
+
+ ::BitmapReadAccess* pBitmapReadAcc = aBitmap.AcquireReadAccess();
+ ::BitmapReadAccess* pAlphaReadAcc = nullptr;
+ const tools::Long nWidth = rnWidth = pBitmapReadAcc->Width();
+ const tools::Long nHeight = rnHeight = pBitmapReadAcc->Height();
+ tools::Long nX, nY;
+ bool bIsAlpha = false;
+
+ if( aBmpEx.IsAlpha() )
+ pAlphaReadAcc = aAlpha.AcquireReadAccess();
+
+ data = static_cast<unsigned char*>(malloc( nWidth*nHeight*4 ));
+
+ tools::Long nOff = 0;
+ ::Color aColor;
+ unsigned int nAlpha = 255;
+
+#if !ENABLE_WASM_STRIP_PREMULTIPLY
+ vcl::bitmap::lookup_table const & premultiply_table = vcl::bitmap::get_premultiply_table();
+#endif
+ for( nY = 0; nY < nHeight; nY++ )
+ {
+ ::Scanline pReadScan;
+
+ switch( pBitmapReadAcc->GetScanlineFormat() )
+ {
+ case ScanlineFormat::N8BitPal:
+ pReadScan = pBitmapReadAcc->GetScanline( nY );
+ if( pAlphaReadAcc )
+ if( readAlpha( pAlphaReadAcc, nY, nWidth, data, nOff ) )
+ bIsAlpha = true;
+
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+#ifdef OSL_BIGENDIAN
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff++ ];
+ else
+ nAlpha = data[ nOff++ ] = 255;
+#else
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff + 3 ];
+ else
+ nAlpha = data[ nOff + 3 ] = 255;
+#endif
+ aColor = pBitmapReadAcc->GetPaletteColor(*pReadScan++);
+
+#ifdef OSL_BIGENDIAN
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetRed());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetGreen());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetBlue());
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
+#endif
+#else
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetBlue());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetGreen());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetRed());
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
+#endif
+ nOff++;
+#endif
+ }
+ break;
+ case ScanlineFormat::N24BitTcBgr:
+ pReadScan = pBitmapReadAcc->GetScanline( nY );
+ if( pAlphaReadAcc )
+ if( readAlpha( pAlphaReadAcc, nY, nWidth, data, nOff ) )
+ bIsAlpha = true;
+
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+#ifdef OSL_BIGENDIAN
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff ];
+ else
+ nAlpha = data[ nOff ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff + 3 ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff + 2 ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff + 1 ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+#else
+ data[ nOff + 3 ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff + 2 ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff + 1 ] = premultiply_table[nAlpha][*pReadScan++];
+#endif
+ nOff += 4;
+#else
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff + 3 ];
+ else
+ nAlpha = data[ nOff + 3 ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+#endif
+ nOff++;
+#endif
+ }
+ break;
+ case ScanlineFormat::N24BitTcRgb:
+ pReadScan = pBitmapReadAcc->GetScanline( nY );
+ if( pAlphaReadAcc )
+ if( readAlpha( pAlphaReadAcc, nY, nWidth, data, nOff ) )
+ bIsAlpha = true;
+
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+#ifdef OSL_BIGENDIAN
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff++ ];
+ else
+ nAlpha = data[ nOff++ ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+#endif
+#else
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff + 3 ];
+ else
+ nAlpha = data[ nOff + 3 ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 2 ]);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 1 ]);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 0 ]);
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 2 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 1 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 0 ]];
+#endif
+ pReadScan += 3;
+ nOff++;
+#endif
+ }
+ break;
+ case ScanlineFormat::N32BitTcBgra:
+ pReadScan = pBitmapReadAcc->GetScanline( nY );
+ if( pAlphaReadAcc )
+ if( readAlpha( pAlphaReadAcc, nY, nWidth, data, nOff ) )
+ bIsAlpha = true;
+
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+#ifdef OSL_BIGENDIAN
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff++ ];
+ else
+ nAlpha = data[ nOff++ ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 2 ]);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 1 ]);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 0 ]);
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 2 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 1 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 0 ]];
+#endif
+ pReadScan += 4;
+#else
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff + 3 ];
+ else
+ nAlpha = data[ nOff + 3 ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+#endif
+ pReadScan++;
+ nOff++;
+#endif
+ }
+ break;
+ case ScanlineFormat::N32BitTcRgba:
+ pReadScan = pBitmapReadAcc->GetScanline( nY );
+ if( pAlphaReadAcc )
+ if( readAlpha( pAlphaReadAcc, nY, nWidth, data, nOff ) )
+ bIsAlpha = true;
+
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+#ifdef OSL_BIGENDIAN
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff ++ ];
+ else
+ nAlpha = data[ nOff ++ ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, *pReadScan++);
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+#endif
+ pReadScan++;
+#else
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff + 3 ];
+ else
+ nAlpha = data[ nOff + 3 ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 2 ]);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 1 ]);
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, pReadScan[ 0 ]);
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 2 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 1 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 0 ]];
+#endif
+ pReadScan += 4;
+ nOff++;
+#endif
+ }
+ break;
+ default:
+ SAL_INFO( "canvas.cairo", "fallback to GetColor - slow, format: " << static_cast<int>(pBitmapReadAcc->GetScanlineFormat()) );
+
+ if( pAlphaReadAcc )
+ if( readAlpha( pAlphaReadAcc, nY, nWidth, data, nOff ) )
+ bIsAlpha = true;
+
+ for( nX = 0; nX < nWidth; nX++ )
+ {
+ aColor = pBitmapReadAcc->GetColor( nY, nX );
+
+ // cairo need premultiplied color values
+ // TODO(rodo) handle endianness
+#ifdef OSL_BIGENDIAN
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff++ ];
+ else
+ nAlpha = data[ nOff++ ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetRed());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetGreen());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetBlue());
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
+#endif
+#else
+ if( pAlphaReadAcc )
+ nAlpha = data[ nOff + 3 ];
+ else
+ nAlpha = data[ nOff + 3 ] = 255;
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetBlue());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetGreen());
+ data[ nOff++ ] = vcl::bitmap::premultiply(nAlpha, aColor.GetRed());
+#else
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
+#endif
+ nOff ++;
+#endif
+ }
+ }
+ }
+
+ ::Bitmap::ReleaseAccess( pBitmapReadAcc );
+ if( pAlphaReadAcc )
+ aAlpha.ReleaseAccess( pAlphaReadAcc );
+
+ bHasAlpha = bIsAlpha;
+
+}
+
+ uno::Sequence< sal_Int8 > CanvasExtractBitmapData(BitmapEx const & rBitmapEx, const geometry::IntegerRectangle2D& rect)
+ {
+ Bitmap aBitmap( rBitmapEx.GetBitmap() );
+ Bitmap aAlpha( rBitmapEx.GetAlpha().GetBitmap() );
+
+ Bitmap::ScopedReadAccess pReadAccess( aBitmap );
+ Bitmap::ScopedReadAccess pAlphaReadAccess( aAlpha.IsEmpty() ?
+ nullptr : aAlpha.AcquireReadAccess(),
+ aAlpha );
+
+ assert( pReadAccess );
+
+ // TODO(F1): Support more formats.
+ const Size aBmpSize( aBitmap.GetSizePixel() );
+
+ // for the time being, always return as BGRA
+ uno::Sequence< sal_Int8 > aRes( 4*aBmpSize.Width()*aBmpSize.Height() );
+ sal_Int8* pRes = aRes.getArray();
+
+ int nCurrPos(0);
+ for( tools::Long y=rect.Y1;
+ y<aBmpSize.Height() && y<rect.Y2;
+ ++y )
+ {
+ if( pAlphaReadAccess.get() != nullptr )
+ {
+ Scanline pScanlineReadAlpha = pAlphaReadAccess->GetScanline( y );
+ for( tools::Long x=rect.X1;
+ x<aBmpSize.Width() && x<rect.X2;
+ ++x )
+ {
+ pRes[ nCurrPos++ ] = pReadAccess->GetColor( y, x ).GetRed();
+ pRes[ nCurrPos++ ] = pReadAccess->GetColor( y, x ).GetGreen();
+ pRes[ nCurrPos++ ] = pReadAccess->GetColor( y, x ).GetBlue();
+ pRes[ nCurrPos++ ] = pAlphaReadAccess->GetIndexFromData( pScanlineReadAlpha, x );
+ }
+ }
+ else
+ {
+ for( tools::Long x=rect.X1;
+ x<aBmpSize.Width() && x<rect.X2;
+ ++x )
+ {
+ pRes[ nCurrPos++ ] = pReadAccess->GetColor( y, x ).GetRed();
+ pRes[ nCurrPos++ ] = pReadAccess->GetColor( y, x ).GetGreen();
+ pRes[ nCurrPos++ ] = pReadAccess->GetColor( y, x ).GetBlue();
+ pRes[ nCurrPos++ ] = sal_uInt8(255);
+ }
+ }
+ }
+ return aRes;
+ }
+
+ BitmapEx createHistorical8x8FromArray(std::array<sal_uInt8,64> const & pArray, Color aColorPix, Color aColorBack)
+ {
+ BitmapPalette aPalette(2);
+
+ aPalette[0] = BitmapColor(aColorBack);
+ aPalette[1] = BitmapColor(aColorPix);
+
+ Bitmap aBitmap(Size(8, 8), vcl::PixelFormat::N1_BPP, &aPalette);
+ BitmapScopedWriteAccess pContent(aBitmap);
+
+ for(sal_uInt16 a(0); a < 8; a++)
+ {
+ for(sal_uInt16 b(0); b < 8; b++)
+ {
+ if(pArray[(a * 8) + b])
+ {
+ pContent->SetPixelIndex(a, b, 1);
+ }
+ else
+ {
+ pContent->SetPixelIndex(a, b, 0);
+ }
+ }
+ }
+
+ return BitmapEx(aBitmap);
+ }
+
+ bool isHistorical8x8(const BitmapEx& rBitmapEx, Color& o_rBack, Color& o_rFront)
+ {
+ bool bRet(false);
+
+ if(!rBitmapEx.IsAlpha())
+ {
+ Bitmap aBitmap(rBitmapEx.GetBitmap());
+
+ if(8 == aBitmap.GetSizePixel().Width() && 8 == aBitmap.GetSizePixel().Height())
+ {
+ if (aBitmap.getPixelFormat() == vcl::PixelFormat::N1_BPP)
+ {
+ BitmapReadAccess* pRead = aBitmap.AcquireReadAccess();
+
+ if(pRead)
+ {
+ if(pRead->HasPalette() && 2 == pRead->GetPaletteEntryCount())
+ {
+ const BitmapPalette& rPalette = pRead->GetPalette();
+ o_rFront = rPalette[1];
+ o_rBack = rPalette[0];
+
+ bRet = true;
+ }
+
+ Bitmap::ReleaseAccess(pRead);
+ }
+ }
+ else
+ {
+ // Historical 1bpp images are getting really historical,
+ // even to the point that e.g. the png loader actually loads
+ // them as RGB. But the pattern code in svx relies on this
+ // assumption that any 2-color 1bpp bitmap is a pattern, and so it would
+ // get confused by RGB. Try to detect if this image is really
+ // just two colors and say it's a pattern bitmap if so.
+ Bitmap::ScopedReadAccess access(aBitmap);
+ o_rBack = access->GetColor(0,0);
+ bool foundSecondColor = false;;
+ for(tools::Long y = 0; y < access->Height(); ++y)
+ for(tools::Long x = 0; x < access->Width(); ++x)
+ {
+ if(!foundSecondColor)
+ {
+ if( access->GetColor(y,x) != o_rBack )
+ {
+ o_rFront = access->GetColor(y,x);
+ foundSecondColor = true;
+ // Hard to know which of the two colors is the background,
+ // select the lighter one.
+ if( o_rFront.GetLuminance() > o_rBack.GetLuminance())
+ std::swap( o_rFront, o_rBack );
+ }
+ }
+ else
+ {
+ if( access->GetColor(y,x) != o_rBack && access->GetColor(y,x) != o_rFront)
+ return false;
+ }
+ }
+ return true;
+ }
+ }
+ }
+
+ return bRet;
+ }
+
+#if ENABLE_WASM_STRIP_PREMULTIPLY
+ sal_uInt8 unpremultiply(sal_uInt8 c, sal_uInt8 a)
+ {
+ return (a == 0) ? 0 : (c * 255 + a / 2) / a;
+ }
+
+ sal_uInt8 premultiply(sal_uInt8 c, sal_uInt8 a)
+ {
+ return (c * a + 127) / 255;
+ }
+#else
+ sal_uInt8 unpremultiply(sal_uInt8 c, sal_uInt8 a)
+ {
+ return get_unpremultiply_table()[a][c];
+ }
+
+ static constexpr sal_uInt8 unpremultiplyImpl(sal_uInt8 c, sal_uInt8 a)
+ {
+ return (a == 0) ? 0 : (c * 255 + a / 2) / a;
+ }
+
+ sal_uInt8 premultiply(sal_uInt8 c, sal_uInt8 a)
+ {
+ return get_premultiply_table()[a][c];
+ }
+
+ static constexpr sal_uInt8 premultiplyImpl(sal_uInt8 c, sal_uInt8 a)
+ {
+ return (c * a + 127) / 255;
+ }
+
+ template<int... Is> static constexpr std::array<sal_uInt8, 256> make_unpremultiply_table_row_(
+ int a, std::integer_sequence<int, Is...>)
+ {
+ return {unpremultiplyImpl(Is, a)...};
+ }
+
+ template<int... Is> static constexpr lookup_table make_unpremultiply_table_(
+ std::integer_sequence<int, Is...>)
+ {
+ return {make_unpremultiply_table_row_(Is, std::make_integer_sequence<int, 256>{})...};
+ }
+
+ lookup_table const & get_unpremultiply_table()
+ {
+ static constexpr auto unpremultiply_table = make_unpremultiply_table_(
+ std::make_integer_sequence<int, 256>{});
+ return unpremultiply_table;
+ }
+
+ template<int... Is> static constexpr std::array<sal_uInt8, 256> make_premultiply_table_row_(
+ int a, std::integer_sequence<int, Is...>)
+ {
+ return {premultiplyImpl(Is, a)...};
+ }
+
+ template<int... Is> static constexpr lookup_table make_premultiply_table_(
+ std::integer_sequence<int, Is...>)
+ {
+ return {make_premultiply_table_row_(Is, std::make_integer_sequence<int, 256>{})...};
+ }
+
+ lookup_table const & get_premultiply_table()
+ {
+ static constexpr auto premultiply_table = make_premultiply_table_(
+ std::make_integer_sequence<int, 256>{});
+ return premultiply_table;
+ }
+#endif
+
+bool convertBitmap32To24Plus8(BitmapEx const & rInput, BitmapEx & rResult)
+{
+ Bitmap aBitmap(rInput.GetBitmap());
+ if (aBitmap.getPixelFormat() != vcl::PixelFormat::N32_BPP)
+ return false;
+
+ Size aSize = aBitmap.GetSizePixel();
+ Bitmap aResultBitmap(aSize, vcl::PixelFormat::N24_BPP);
+ AlphaMask aResultAlpha(aSize);
+ {
+ BitmapScopedWriteAccess pResultBitmapAccess(aResultBitmap);
+ AlphaScopedWriteAccess pResultAlphaAccess(aResultAlpha);
+
+ Bitmap::ScopedReadAccess pReadAccess(aBitmap);
+
+ for (tools::Long nY = 0; nY < aSize.Height(); ++nY)
+ {
+ Scanline aResultScan = pResultBitmapAccess->GetScanline(nY);
+ Scanline aResultScanAlpha = pResultAlphaAccess->GetScanline(nY);
+
+ Scanline aReadScan = pReadAccess->GetScanline(nY);
+
+ for (tools::Long nX = 0; nX < aSize.Width(); ++nX)
+ {
+ const BitmapColor aColor = pReadAccess->GetPixelFromData(aReadScan, nX);
+ BitmapColor aResultColor(aColor.GetRed(), aColor.GetGreen(), aColor.GetBlue());
+ BitmapColor aResultColorAlpha(255 - aColor.GetAlpha(), 255 - aColor.GetAlpha(), 255 - aColor.GetAlpha());
+
+ pResultBitmapAccess->SetPixelOnData(aResultScan, nX, aResultColor);
+ pResultAlphaAccess->SetPixelOnData(aResultScanAlpha, nX, aResultColorAlpha);
+ }
+ }
+ }
+ if (rInput.IsAlpha())
+ rResult = BitmapEx(aResultBitmap, rInput.GetAlpha());
+ else
+ rResult = BitmapEx(aResultBitmap, aResultAlpha);
+ return true;
+}
+
+Bitmap GetDownsampledBitmap(Size const& rDstSizeTwip, Point const& rSrcPt, Size const& rSrcSz,
+ Bitmap const& rBmp, tools::Long nMaxBmpDPIX, tools::Long nMaxBmpDPIY)
+{
+ Bitmap aBmp(rBmp);
+
+ if (!aBmp.IsEmpty())
+ {
+ const tools::Rectangle aBmpRect( Point(), aBmp.GetSizePixel() );
+ tools::Rectangle aSrcRect( rSrcPt, rSrcSz );
+
+ // do cropping if necessary
+ if( aSrcRect.Intersection( aBmpRect ) != aBmpRect )
+ {
+ if( !aSrcRect.IsEmpty() )
+ aBmp.Crop( aSrcRect );
+ else
+ aBmp.SetEmpty();
+ }
+
+ if( !aBmp.IsEmpty() )
+ {
+ // do downsampling if necessary
+ // #103209# Normalize size (mirroring has to happen outside of this method)
+ Size aDstSizeTwip(std::abs(rDstSizeTwip.Width()), std::abs(rDstSizeTwip.Height()));
+
+ const Size aBmpSize( aBmp.GetSizePixel() );
+ const double fBmpPixelX = aBmpSize.Width();
+ const double fBmpPixelY = aBmpSize.Height();
+ const double fMaxPixelX
+ = o3tl::convert<double>(aDstSizeTwip.Width(), o3tl::Length::twip, o3tl::Length::in)
+ * nMaxBmpDPIX;
+ const double fMaxPixelY
+ = o3tl::convert<double>(aDstSizeTwip.Height(), o3tl::Length::twip, o3tl::Length::in)
+ * nMaxBmpDPIY;
+
+ // check, if the bitmap DPI exceeds the maximum DPI (allow 4 pixel rounding tolerance)
+ if (((fBmpPixelX > (fMaxPixelX + 4)) ||
+ (fBmpPixelY > (fMaxPixelY + 4))) &&
+ (fBmpPixelY > 0.0) && (fMaxPixelY > 0.0))
+ {
+ // do scaling
+ Size aNewBmpSize;
+ const double fBmpWH = fBmpPixelX / fBmpPixelY;
+ const double fMaxWH = fMaxPixelX / fMaxPixelY;
+
+ if (fBmpWH < fMaxWH)
+ {
+ aNewBmpSize.setWidth(FRound(fMaxPixelY * fBmpWH));
+ aNewBmpSize.setHeight(FRound(fMaxPixelY));
+ }
+ else if (fBmpWH > 0.0)
+ {
+ aNewBmpSize.setWidth(FRound(fMaxPixelX));
+ aNewBmpSize.setHeight(FRound(fMaxPixelX / fBmpWH));
+ }
+
+ if( aNewBmpSize.Width() && aNewBmpSize.Height() )
+ aBmp.Scale(aNewBmpSize);
+ else
+ aBmp.SetEmpty();
+ }
+ }
+ }
+
+ return aBmp;
+}
+
+} // end vcl::bitmap
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 13:51:33 +0000