canvas/source/tools/page.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <boost/mem_fn.hpp>
  21 #include "page.hxx"
  22
  23 namespace canvas
  24 {
  25     Page::Page( const IRenderModuleSharedPtr &rRenderModule ) :
  26         mpRenderModule(rRenderModule),
  27         mpSurface(rRenderModule->createSurface(::basegfx::B2ISize()))
  28     {
  29     }
  30
  31     void Page::validate()
  32     {
  33         if(!(isValid()))
  34         {
  35             ::std::for_each( mpFragments.begin(),
  36                              mpFragments.end(),
  37                              ::boost::mem_fn(&PageFragment::refresh));
  38         }
  39     }
  40
  41     bool Page::isValid() const
  42     {
  43         return mpSurface && mpSurface->isValid();
  44     }
  45
  46     FragmentSharedPtr Page::allocateSpace( const ::basegfx::B2ISize& rSize )
  47     {
  48         SurfaceRect rect(rSize);
  49         if(insert(rect))
  50         {
  51             FragmentSharedPtr pFragment(new PageFragment(rect,this));
  52             mpFragments.push_back(pFragment);
  53             return pFragment;
  54         }
  55
  56         return FragmentSharedPtr();
  57     }
  58
  59     bool Page::nakedFragment( const FragmentSharedPtr& pFragment )
  60     {
  61         SurfaceRect rect(pFragment->getSize());
  62         if(insert(rect))
  63         {
  64             pFragment->setPage(this);
  65             mpFragments.push_back(pFragment);
  66             return true;
  67         }
  68
  69         return false;
  70     }
  71
  72     void Page::free( const FragmentSharedPtr& pFragment )
  73     {
  74         // the fragment passes as argument is no longer
  75         // dedicated to this page. either it is about to
  76         // be relocated to some other page or it will
  77         // currently be deleted. in either case, simply
  78         // remove the reference from our internal storage.
  79         FragmentContainer_t::iterator it(
  80             std::remove(
  81                 mpFragments.begin(),mpFragments.end(),pFragment));
  82         mpFragments.erase(it,mpFragments.end());
  83     }
  84
  85     bool Page::insert( SurfaceRect& r )
  86     {
  87         const FragmentContainer_t::const_iterator aEnd(mpFragments.end());
  88         FragmentContainer_t::const_iterator       it(mpFragments.begin());
  89         while(it != aEnd)
  90         {
  91             const SurfaceRect &rect = (*it)->getRect();
  92             const sal_Int32 x = rect.maPos.getX();
  93             const sal_Int32 y = rect.maPos.getY();
  94             // to avoid interpolation artifacts from other textures,
  95             // one pixel gap between them
  96             const sal_Int32 w = rect.maSize.getX()+1;
  97             const sal_Int32 h = rect.maSize.getY()+1;
  98
  99             // probe location to the right
 100             r.maPos.setX(x+w);
 101             r.maPos.setY(y);
 102             if(isValidLocation(r))
 103                 return true;
 104
 105             // probe location at bottom
 106             r.maPos.setX(x);
 107             r.maPos.setY(y+h);
 108             if(isValidLocation(r))
 109                 return true;
 110
 111             ++it;
 112         }
 113
 114         r.maPos.setX(0);
 115         r.maPos.setY(0);
 116
 117         return isValidLocation(r);
 118     }
 119
 120     bool Page::isValidLocation( const SurfaceRect& r ) const
 121     {
 122         // the rectangle passed as argument has a valid
 123         // location if and only if there's no intersection
 124         // with existing areas.
 125         SurfaceRect aBoundary(mpRenderModule->getPageSize()-basegfx::B2IVector(1,1));
 126         if( !r.inside(aBoundary) )
 127             return false;
 128
 129         const FragmentContainer_t::const_iterator aEnd(mpFragments.end());
 130         FragmentContainer_t::const_iterator       it(mpFragments.begin());
 131         while(it != aEnd)
 132         {
 133             if(r.intersection((*it)->getRect()))
 134                 return false;
 135
 136             ++it;
 137         }
 138
 139         return true;
 140     }
 141 }
 142
 143 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */