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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_drawinglayer.hxx"
#include <drawinglayer/primitive2d/unifiedalphaprimitive2d.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/color/bcolor.hxx>
#include <drawinglayer/primitive2d/polypolygonprimitive2d.hxx>
#include <drawinglayer/primitive2d/alphaprimitive2d.hxx>
#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>
#include <drawinglayer/primitive2d/polygonprimitive2d.hxx>
//////////////////////////////////////////////////////////////////////////////
using namespace com::sun::star;
//////////////////////////////////////////////////////////////////////////////
namespace drawinglayer
{
namespace primitive2d
{
UnifiedAlphaPrimitive2D::UnifiedAlphaPrimitive2D(
const Primitive2DSequence& rChildren,
double fAlpha)
: GroupPrimitive2D(rChildren),
mfAlpha(fAlpha)
{
}
bool UnifiedAlphaPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
{
if(GroupPrimitive2D::operator==(rPrimitive))
{
const UnifiedAlphaPrimitive2D& rCompare = (UnifiedAlphaPrimitive2D&)rPrimitive;
return (getAlpha() == rCompare.getAlpha());
}
return false;
}
Primitive2DSequence UnifiedAlphaPrimitive2D::get2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const
{
if(0.0 == getAlpha())
{
// no transparence used, so just use the content
return getChildren();
}
else if(getAlpha() > 0.0 && getAlpha() < 1.0)
{
// The idea is to create a AlphaPrimitive2D with alpha content using a fill color
// corresponding to the alpha value. Problem is that in most systems, the right
// and bottom pixel array is not filled when filling polygons, thus this would not
// always produce a complete alpha bitmap. There are some solutions:
//
// - Grow the used polygon range by one discrete unit in X and Y. This
// will make the decomposition view-dependent.
//
// - For all filled polygon renderings, dra wthe polygon outline extra. This
// would lead to unwanted side effects when using concatenated polygons.
//
// - At this decomposition, add a filled polygon and a hairline polygon. This
// solution stays view-independent.
//
// I will take the last one here. The small overhead of two primitives will only be
// used when UnifiedAlphaPrimitive2D is not handled directly.
const basegfx::B2DRange aPolygonRange(getB2DRangeFromPrimitive2DSequence(getChildren(), rViewInformation));
const basegfx::B2DPolygon aPolygon(basegfx::tools::createPolygonFromRect(aPolygonRange));
const basegfx::BColor aGray(getAlpha(), getAlpha(), getAlpha());
Primitive2DSequence aAlphaContent(2);
aAlphaContent[0] = Primitive2DReference(new PolyPolygonColorPrimitive2D(basegfx::B2DPolyPolygon(aPolygon), aGray));
aAlphaContent[1] = Primitive2DReference(new PolygonHairlinePrimitive2D(aPolygon, aGray));
// create sub-transparence group with a gray-colored rectangular fill polygon
const Primitive2DReference xRefB(new AlphaPrimitive2D(getChildren(), aAlphaContent));
return Primitive2DSequence(&xRefB, 1L);
}
else
{
// completely transparent or invalid definition, add nothing
return Primitive2DSequence();
}
}
// provide unique ID
ImplPrimitrive2DIDBlock(UnifiedAlphaPrimitive2D, PRIMITIVE2D_ID_UNIFIEDALPHAPRIMITIVE2D)
} // end of namespace primitive2d
} // end of namespace drawinglayer
//////////////////////////////////////////////////////////////////////////////
// eof
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