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 <sal/config.h>
  21
  22 #include "page.hxx"
  23
  24 namespace canvas
  25 {
  26     Page::Page( const std::shared_ptr<IRenderModule> &rRenderModule ) :
  27         mpRenderModule(rRenderModule),
  28         mpSurface(rRenderModule->createSurface(::basegfx::B2ISize()))
  29     {
  30     }
  31
  32     void Page::validate()
  33     {
  34         if(!(isValid()))
  35         {
  36             for( const auto& rFragmentPtr : mpFragments )
  37                 rFragmentPtr->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 = std::make_shared<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         for( const auto& pFragment : mpFragments )
  88         {
  89             const SurfaceRect &rect = pFragment->getRect();
  90             const sal_Int32 x = rect.maPos.getX();
  91             const sal_Int32 y = rect.maPos.getY();
  92             // to avoid interpolation artifacts from other textures,
  93             // one pixel gap between them
  94             const sal_Int32 w = rect.maSize.getX()+1;
  95             const sal_Int32 h = rect.maSize.getY()+1;
  96
  97             // probe location to the right
  98             r.maPos.setX(x+w);
  99             r.maPos.setY(y);
 100             if(isValidLocation(r))
 101                 return true;
 102
 103             // probe location at bottom
 104             r.maPos.setX(x);
 105             r.maPos.setY(y+h);
 106             if(isValidLocation(r))
 107                 return true;
 108         }
 109
 110         r.maPos.setX(0);
 111         r.maPos.setY(0);
 112
 113         return isValidLocation(r);
 114     }
 115
 116     bool Page::isValidLocation( const SurfaceRect& r ) const
 117     {
 118         // the rectangle passed as argument has a valid
 119         // location if and only if there's no intersection
 120         // with existing areas.
 121         SurfaceRect aBoundary(mpRenderModule->getPageSize());
 122         if( !r.inside(aBoundary) )
 123             return false;
 124
 125         for( const auto& pFragment : mpFragments )
 126         {
 127             if( r.intersection( pFragment->getRect() ) )
 128                 return false;
 129         }
 130
 131         return true;
 132     }
 133 }
 134
 135 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */