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Diffstat (limited to 'basegfx/inc/basegfx/polygon/b2dpolypolygonrasterconverter.hxx')
-rw-r--r-- | basegfx/inc/basegfx/polygon/b2dpolypolygonrasterconverter.hxx | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/basegfx/inc/basegfx/polygon/b2dpolypolygonrasterconverter.hxx b/basegfx/inc/basegfx/polygon/b2dpolypolygonrasterconverter.hxx new file mode 100644 index 000000000000..e43a9a57c5bb --- /dev/null +++ b/basegfx/inc/basegfx/polygon/b2dpolypolygonrasterconverter.hxx @@ -0,0 +1,144 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/************************************************************************* + * + * 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. + * + ************************************************************************/ + +#ifndef _BGFX_POLYGON_B2DPOLYPOLYGONRASTERCONVERTER_HXX +#define _BGFX_POLYGON_B2DPOLYPOLYGONRASTERCONVERTER_HXX + +#include <basegfx/point/b2dpoint.hxx> +#include <basegfx/range/b2drectangle.hxx> +#include <basegfx/polygon/b2dpolypolygon.hxx> +#include <basegfx/polygon/b2dpolypolygonfillrule.hxx> +#include <vector> +#include <utility> + +////////////////////////////////////////////////////////////////////////////// + +namespace basegfx +{ + /** Raster-convert a poly-polygon. + + This class can raster-convert a given poly-polygon. Simply + derive from this, and override the span() method, which will + get called for every scanline span of the poly-polygon. + + @derive + Overwrite span() with the render output method of your choice. + */ + class B2DPolyPolygonRasterConverter + { + public: + /** Create raster-converter for given poly-polygon + */ + B2DPolyPolygonRasterConverter(const B2DPolyPolygon& rPolyPolyRaster); + + /** Create raster-converter for given poly-polygon and raster + area. + + @param rPolyPolyRaster + Poly-Polygon to raster convert + + @param rMinUpdateArea + Minimal area to touch when raster-converting. The + rectangle given here is guaranteed to be iterated through + scanline by scanline (but the raster converter might + actually use more scanlines, e.g. if the poly-polygon's + bound rect is larger). One of the cases where this + parameter comes in handy is when rendering in the 'off' + spans, and a certain area must be filled. <em>Do not</em> + use this for clipping, as described above, the touched + area might also be larger. + */ + B2DPolyPolygonRasterConverter(const B2DPolyPolygon& rPolyPolyRaster, + const B2DRectangle& rRasterArea ); + + virtual ~B2DPolyPolygonRasterConverter(); + + /** Raster-convert the contained poly-polygon + + @param eFillRule + Fill rule to use for span filling + */ + void rasterConvert( FillRule eFillRule); + + /** Override this method, to be called for every scanline span + of the poly-polygon + + @param rfXLeft + The left end of the current horizontal span + + @param rfXRight + The right end of the current horizontal span + + @param nY + The y position of the current horizontal span + + @param bOn + Denotes whether this span is on or off, according to the + active fill rule. + */ + virtual void span(const double& rfXLeft, + const double& rfXRight, + sal_Int32 nY, + bool bOn ) = 0; + + /// @internal + struct Vertex + { + inline Vertex(); + inline Vertex( const B2DPoint&, const B2DPoint&, bool ); + + B2DPoint aP1; + B2DPoint aP2; + bool bDownwards; + }; + + private: + // default: disabled copy/assignment + B2DPolyPolygonRasterConverter(const B2DPolyPolygonRasterConverter&); + B2DPolyPolygonRasterConverter& operator=( const B2DPolyPolygonRasterConverter& ); + + void init(); + + typedef ::std::vector<Vertex> VectorOfVertices; + typedef ::std::vector<VectorOfVertices> VectorOfVertexVectors; + + /// The poly-polygon to raster-convert + B2DPolyPolygon maPolyPolygon; + /// Total bound rect of the poly-polygon + const B2DRectangle maPolyPolyRectangle; + + /** Vector containing for each scanline a vector which in turn + contains all vertices that start on the specific scanline + */ + VectorOfVertexVectors maScanlines; + }; +} + +#endif /* _BGFX_POLYGON_B2DPOLYPOLYGONRASTERCONVERTER_HXX */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |