1 files changed, 152 insertions, 0 deletions
diff --git a/canvas/source/tools/page.cxx b/canvas/source/tools/page.cxx
new file mode 100644
index 000000000000..5035c0e81916
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+++ b/canvas/source/tools/page.cxx
@@ -0,0 +1,152 @@
+/*************************************************************************
+ *
+ * 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_canvas.hxx"
+
+#include <boost/bind.hpp>
+#include "page.hxx"
+
+namespace canvas
+{
+    Page::Page( const IRenderModuleSharedPtr &rRenderModule ) :
+        mpRenderModule(rRenderModule),
+        mpSurface(rRenderModule->createSurface(::basegfx::B2ISize()))
+    {
+    }
+
+    void Page::validate()
+    {
+        if(!(isValid()))
+        {
+            ::std::for_each( mpFragments.begin(),
+                             mpFragments.end(),
+                             ::boost::mem_fn(&PageFragment::refresh));
+        }
+    }
+
+    bool Page::isValid() const
+    {
+        return mpSurface && mpSurface->isValid();
+    }
+
+    FragmentSharedPtr Page::allocateSpace( const ::basegfx::B2ISize& rSize )
+    {
+        SurfaceRect rect(rSize);
+        if(insert(rect))
+        {
+            FragmentSharedPtr pFragment(new PageFragment(rect,this));
+            mpFragments.push_back(pFragment);
+            return pFragment;
+        }
+
+        return FragmentSharedPtr();
+    }
+
+    bool Page::nakedFragment( const FragmentSharedPtr& pFragment )
+    {
+        SurfaceRect rect(pFragment->getSize());
+        if(insert(rect))
+        {
+            pFragment->setPage(this);
+            mpFragments.push_back(pFragment);
+            return true;
+        }
+
+        return false;
+    }
+
+    void Page::free( const FragmentSharedPtr& pFragment )
+    {
+        // the fragment passes as argument is no longer
+        // dedicated to this page. either it is about to
+        // be relocated to some other page or it will
+        // currently be deleted. in either case, simply
+        // remove the reference from our internal storage.
+        FragmentContainer_t::iterator it(
+            std::remove(
+                mpFragments.begin(),mpFragments.end(),pFragment));
+        mpFragments.erase(it,mpFragments.end());
+    }
+
+    bool Page::insert( SurfaceRect& r )
+    {
+        const FragmentContainer_t::const_iterator aEnd(mpFragments.end());
+        FragmentContainer_t::const_iterator       it(mpFragments.begin());
+        while(it != aEnd)
+        {
+            const SurfaceRect &rect = (*it)->getRect();
+            const sal_Int32 x = rect.maPos.getX();
+            const sal_Int32 y = rect.maPos.getY();
+            // to avoid interpolation artifacts from other textures,
+            // one pixel gap between them
+            const sal_Int32 w = rect.maSize.getX()+1;
+            const sal_Int32 h = rect.maSize.getY()+1;
+
+            // probe location to the right
+            r.maPos.setX(x+w);
+            r.maPos.setY(y);
+            if(isValidLocation(r))
+                return true;
+
+            // probe location at bottom
+            r.maPos.setX(x);
+            r.maPos.setY(y+h);
+            if(isValidLocation(r))
+                return true;
+
+            ++it;
+        }
+
+        r.maPos.setX(0);
+        r.maPos.setY(0);
+
+        return isValidLocation(r);
+    }
+
+    bool Page::isValidLocation( const SurfaceRect& r ) const
+    {
+        // the rectangle passed as argument has a valid
+        // location if and only if there's no intersection
+        // with existing areas.
+        SurfaceRect aBoundary(mpRenderModule->getPageSize()-basegfx::B2IVector(1,1));
+        if( !r.inside(aBoundary) )
+            return false;
+
+        const FragmentContainer_t::const_iterator aEnd(mpFragments.end());
+        FragmentContainer_t::const_iterator       it(mpFragments.begin());
+        while(it != aEnd)
+        {
+            if(r.intersection((*it)->getRect()))
+                return false;
+
+            ++it;
+        }
+
+        return true;
+    }
+}