1 files changed, 148 insertions, 0 deletions
diff --git a/canvas/source/tools/page.hxx b/canvas/source/tools/page.hxx
new file mode 100644
index 0000000000..6af4bf0f6b
--- /dev/null
+++ b/canvas/source/tools/page.hxx
@@ -0,0 +1,148 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <basegfx/vector/b2isize.hxx>
+#include <basegfx/vector/b2ivector.hxx>
+#include <basegfx/range/b2irectangle.hxx>
+#include <rendering/icolorbuffer.hxx>
+#include <rendering/irendermodule.hxx>
+#include <rendering/isurface.hxx>
+
+#include <memory>
+#include <vector>
+#include "surfacerect.hxx"
+
+namespace canvas
+{
+    class PageFragment;
+
+    typedef std::shared_ptr< PageFragment > FragmentSharedPtr;
+
+    /** One page of IRenderModule-provided texture space
+     */
+    class Page
+    {
+    public:
+        explicit Page( const std::shared_ptr<IRenderModule>& rRenderModule );
+
+        FragmentSharedPtr        allocateSpace( const ::basegfx::B2ISize& rSize );
+        bool                     nakedFragment( const FragmentSharedPtr& pFragment );
+        void                     free( const FragmentSharedPtr& pFragment );
+        const std::shared_ptr<ISurface>& getSurface() const { return mpSurface; }
+        bool                     isValid() const;
+        void                     validate();
+
+    private:
+        typedef std::vector<FragmentSharedPtr> FragmentContainer_t;
+
+        std::shared_ptr<IRenderModule>  mpRenderModule;
+        std::shared_ptr<ISurface>       mpSurface;
+        FragmentContainer_t     mpFragments;
+
+        bool insert( SurfaceRect& r );
+        bool isValidLocation( const SurfaceRect& r ) const;
+    };
+
+    typedef std::shared_ptr< Page > PageSharedPtr;
+
+
+    /** A part of a page, which gets allocated to a surface
+     */
+    class PageFragment
+    {
+    public:
+        PageFragment( const SurfaceRect& r,
+                      Page*              pPage ) :
+            mpPage(pPage),
+            maRect(r),
+            mpBuffer(),
+            maSourceOffset()
+        {
+        }
+
+        /// Creates a 'naked' fragment.
+        explicit PageFragment( const ::basegfx::B2ISize& rSize ) :
+            mpPage(nullptr),
+            maRect(rSize),
+            mpBuffer(),
+            maSourceOffset()
+        {
+        }
+
+        bool                        isNaked() const { return (mpPage == nullptr); }
+        const SurfaceRect&          getRect() const { return maRect; }
+        const ::basegfx::B2IPoint&  getPos() const { return maRect.maPos; }
+        const ::basegfx::B2ISize&   getSize() const { return maRect.maSize; }
+        void                        setColorBuffer( const std::shared_ptr<IColorBuffer>& pColorBuffer ) { mpBuffer=pColorBuffer; }
+        void                        setSourceOffset( const ::basegfx::B2IPoint& rOffset ) { maSourceOffset=rOffset; }
+        void                        setPage( Page* pPage ) { mpPage=pPage; }
+
+        void free( const FragmentSharedPtr& pFragment )
+        {
+            if(mpPage)
+                mpPage->free(pFragment);
+
+            mpPage=nullptr;
+        }
+
+        bool select( bool bRefresh )
+        {
+            // request was made to select this fragment,
+            // but this fragment has not been located on any
+            // of the available pages, we need to hurry now.
+            if(!mpPage)
+                return false;
+
+            std::shared_ptr<ISurface> pSurface(mpPage->getSurface());
+
+            // select this surface before wiping the contents
+            // since a specific implementation could trigger
+            // a rendering operation here...
+            if(!(pSurface->selectTexture()))
+                return false;
+
+            // call refresh() if requested, otherwise we're up to date...
+            return !bRefresh || refresh();
+        }
+
+        bool refresh()
+        {
+            if(!mpPage)
+                return false;
+
+            std::shared_ptr<ISurface> pSurface(mpPage->getSurface());
+
+            return pSurface->update( maRect.maPos,
+                                     ::basegfx::B2IRectangle(
+                                         maSourceOffset,
+                                         maSourceOffset + basegfx::B2IVector(maRect.maSize.getWidth(), maRect.maSize.getHeight())),
+                                     *mpBuffer );
+        }
+
+    private:
+        Page*                 mpPage;
+        SurfaceRect           maRect;
+        std::shared_ptr<IColorBuffer> mpBuffer;
+        ::basegfx::B2IPoint   maSourceOffset;
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */