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Diffstat (limited to 'canvas/source/tools/surfaceproxy.cxx')
| -rw-r--r-- | canvas/source/tools/surfaceproxy.cxx | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/canvas/source/tools/surfaceproxy.cxx b/canvas/source/tools/surfaceproxy.cxx new file mode 100644 index 0000000000..af76b8b3c3 --- /dev/null +++ b/canvas/source/tools/surfaceproxy.cxx @@ -0,0 +1,141 @@ +/* -*- 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/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <sal/config.h> +#include <sal/log.hxx> + +#include <basegfx/polygon/b2dpolypolygon.hxx> +#include <basegfx/polygon/b2dpolygontriangulator.hxx> +#include <basegfx/polygon/b2dpolypolygontools.hxx> +#include <utility> + +#include "surfaceproxy.hxx" + +namespace canvas +{ + SurfaceProxy::SurfaceProxy( std::shared_ptr<canvas::IColorBuffer> xBuffer, + PageManagerSharedPtr xPageManager ) : + mpPageManager(std::move( xPageManager )), + mpBuffer(std::move( xBuffer )) + { + const ::basegfx::B2ISize aImageSize(mpBuffer->getWidth(),mpBuffer->getHeight()); + const ::basegfx::B2ISize aPageSize(mpPageManager->getPageSize()); + const sal_Int32 aPageSizeX(aPageSize.getWidth()); + const sal_Int32 aPageSizeY(aPageSize.getHeight()); + const sal_Int32 aImageSizeX(aImageSize.getWidth()); + const sal_Int32 aImageSizeY(aImageSize.getHeight()); + + // see if the size of the colorbuffer is larger than the size + // of a single page. if this is the case we divide the + // colorbuffer into as many surfaces as we need to get the + // whole area distributed. otherwise (the colorbuffer is + // smaller than the size of a single page) we search for free + // pages or create a new one. + // the incoming image is too large to fit into a single + // page. strategy: we split the image into rectangular + // areas that are as large as the maximum page size + // dictates and follow the strategy for fitting images. + size_t dwNumSurfaces(0); + for(sal_Int32 y=0; y<aImageSizeY; y+=aPageSizeY) + for(sal_Int32 x=0; x<aImageSizeX; x+=aPageSizeX) + ++dwNumSurfaces; + maSurfaceList.reserve(dwNumSurfaces); + + for(sal_Int32 y=0; y<aImageSizeY; y+=aPageSizeY) + { + for(sal_Int32 x=0; x<aImageSizeX; x+=aPageSizeX) + { + // the current surface is located at the position [x,y] + // and has the size [min(restx,pagesizex),min(resty,pagesizey) + ::basegfx::B2IPoint aOffset(x,y); + ::basegfx::B2ISize aSize( std::min( aImageSize.getWidth()-x, + aPageSize.getWidth() ), + std::min( aImageSize.getHeight()-y, + aPageSize.getHeight() ) ); + + maSurfaceList.push_back( + std::make_shared<Surface>( + mpPageManager, + mpBuffer, + aOffset, + aSize)); + } + } + } + + void SurfaceProxy::setColorBufferDirty() + { + for( const auto& rSurfacePtr : maSurfaceList ) + rSurfacePtr->setColorBufferDirty(); + } + + bool SurfaceProxy::draw( double fAlpha, + const ::basegfx::B2DPoint& rPos, + const ::basegfx::B2DHomMatrix& rTransform ) + { + for( const auto& rSurfacePtr : maSurfaceList ) + rSurfacePtr->draw( fAlpha, rPos, rTransform ); + + return true; + } + + bool SurfaceProxy::draw( double fAlpha, + const ::basegfx::B2DPoint& rPos, + const ::basegfx::B2DRange& rArea, + const ::basegfx::B2DHomMatrix& rTransform ) + { + for( const auto& rSurfacePtr : maSurfaceList ) + rSurfacePtr->drawRectangularArea( fAlpha, rPos, rArea, rTransform ); + + return true; + } + + bool SurfaceProxy::draw( double fAlpha, + const ::basegfx::B2DPoint& rPos, + const ::basegfx::B2DPolyPolygon& rClipPoly, + const ::basegfx::B2DHomMatrix& rTransform ) + { + const ::basegfx::triangulator::B2DTriangleVector& rTriangulatedVector( + ::basegfx::triangulator::triangulate(rClipPoly)); + + // we have now an explicit ::B2DTriangle and ::B2DTriangleVector, + // but I do not know enough about 'drawWithClip' or 'clipTriangleListOnRange' + // to adapt to that. Convert back to old three-point-in-polygon convention + ::basegfx::B2DPolygon aTriangulatedPolygon; + aTriangulatedPolygon.reserve(rTriangulatedVector.size() * 3); + + for(const auto& rCandidate : rTriangulatedVector) + { + aTriangulatedPolygon.append(rCandidate.getA()); + aTriangulatedPolygon.append(rCandidate.getB()); + aTriangulatedPolygon.append(rCandidate.getC()); + } + + // dump polygons + SAL_INFO("canvas", "Original clip polygon: " << basegfx::utils::exportToSvgD( rClipPoly, true, true, false )); + SAL_INFO("canvas", "Triangulated polygon: " << basegfx::utils::exportToSvgD(basegfx::B2DPolyPolygon(aTriangulatedPolygon), true, true, false )); + + for( const auto& rSurfacePtr : maSurfaceList ) + rSurfacePtr->drawWithClip( fAlpha, rPos, aTriangulatedPolygon, rTransform ); + + return true; + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |