1 files changed, 135 insertions, 0 deletions
diff --git a/canvas/source/tools/page.cxx b/canvas/source/tools/page.cxx
new file mode 100644
index 000000000..3537fa0b6
--- /dev/null
+++ b/canvas/source/tools/page.cxx
@@ -0,0 +1,135 @@
+/* -*- 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 "page.hxx"
+
+namespace canvas
+{
+    Page::Page( const std::shared_ptr<IRenderModule> &rRenderModule ) :
+        mpRenderModule(rRenderModule),
+        mpSurface(rRenderModule->createSurface(::basegfx::B2ISize()))
+    {
+    }
+
+    void Page::validate()
+    {
+        if(!(isValid()))
+        {
+            for( const auto& rFragmentPtr : mpFragments )
+                rFragmentPtr->refresh();
+        }
+    }
+
+    bool Page::isValid() const
+    {
+        return mpSurface && mpSurface->isValid();
+    }
+
+    FragmentSharedPtr Page::allocateSpace( const ::basegfx::B2ISize& rSize )
+    {
+        SurfaceRect rect(rSize);
+        if(insert(rect))
+        {
+            FragmentSharedPtr pFragment = std::make_shared<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 )
+    {
+        for( const auto& pFragment : mpFragments )
+        {
+            const SurfaceRect &rect = pFragment->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;
+        }
+
+        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());
+        if( !r.inside(aBoundary) )
+            return false;
+
+        for( const auto& pFragment : mpFragments )
+        {
+            if( r.intersection( pFragment->getRect() ) )
+                return false;
+        }
+
+        return true;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */