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diff --git a/slideshow/source/engine/shapes/viewbackgroundshape.cxx b/slideshow/source/engine/shapes/viewbackgroundshape.cxx
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+/* -*- 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 .
+ */
+
+
+// must be first
+#include <tools/diagnose_ex.h>
+#include <sal/log.hxx>
+
+#include "viewbackgroundshape.hxx"
+#include <tools.hxx>
+
+#include <basegfx/numeric/ftools.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+
+#include <com/sun/star/rendering/XCanvas.hpp>
+
+#include <canvas/canvastools.hxx>
+#include <cppcanvas/vclfactory.hxx>
+#include <cppcanvas/basegfxfactory.hxx>
+#include <cppcanvas/renderer.hxx>
+#include <cppcanvas/bitmap.hxx>
+
+using namespace ::com::sun::star;
+
+
+namespace slideshow::internal
+{
+
+ bool ViewBackgroundShape::prefetch( const ::cppcanvas::CanvasSharedPtr& rDestinationCanvas,
+ const GDIMetaFileSharedPtr& rMtf ) const
+ {
+ SAL_INFO( "slideshow", "::presentation::internal::ViewBackgroundShape::prefetch()" );
+ ENSURE_OR_RETURN_FALSE( rMtf,
+ "ViewBackgroundShape::prefetch(): no valid metafile!" );
+
+ const ::basegfx::B2DHomMatrix& rCanvasTransform(
+ mpViewLayer->getTransformation() );
+
+ if( !mxBitmap.is() ||
+ rMtf != mpLastMtf ||
+ rCanvasTransform != maLastTransformation )
+ {
+ // buffered bitmap is invalid, re-create
+
+ // determine transformed page bounds
+ ::basegfx::B2DRectangle aTmpRect;
+ ::canvas::tools::calcTransformedRectBounds( aTmpRect,
+ maBounds,
+ rCanvasTransform );
+
+ // determine pixel size of bitmap (choose it one pixel
+ // larger, as polygon rendering takes one pixel more
+ // to the right and to the bottom)
+ const ::basegfx::B2ISize aBmpSizePixel(
+ ::basegfx::fround( aTmpRect.getRange().getX() + 1),
+ ::basegfx::fround( aTmpRect.getRange().getY() + 1) );
+
+ // create a bitmap of appropriate size
+ ::cppcanvas::BitmapSharedPtr pBitmap(
+ ::cppcanvas::BaseGfxFactory::createBitmap(
+ rDestinationCanvas,
+ aBmpSizePixel ) );
+
+ ENSURE_OR_THROW( pBitmap,
+ "ViewBackgroundShape::prefetch(): Cannot create background bitmap" );
+
+ ::cppcanvas::BitmapCanvasSharedPtr pBitmapCanvas( pBitmap->getBitmapCanvas() );
+
+ ENSURE_OR_THROW( pBitmapCanvas,
+ "ViewBackgroundShape::prefetch(): Cannot create background bitmap canvas" );
+
+ // clear bitmap
+ initSlideBackground( pBitmapCanvas,
+ aBmpSizePixel );
+
+ // apply linear part of destination canvas transformation (linear means in this context:
+ // transformation without any translational components)
+ ::basegfx::B2DHomMatrix aLinearTransform( rCanvasTransform );
+ aLinearTransform.set( 0, 2, 0.0 );
+ aLinearTransform.set( 1, 2, 0.0 );
+ pBitmapCanvas->setTransformation( aLinearTransform );
+
+ const basegfx::B2DHomMatrix aShapeTransform(basegfx::utils::createScaleTranslateB2DHomMatrix(
+ maBounds.getWidth(), maBounds.getHeight(),
+ maBounds.getMinX(), maBounds.getMinY()));
+
+ ::cppcanvas::RendererSharedPtr pRenderer(
+ ::cppcanvas::VCLFactory::createRenderer(
+ pBitmapCanvas,
+ *rMtf,
+ ::cppcanvas::Renderer::Parameters() ) );
+
+ ENSURE_OR_RETURN_FALSE( pRenderer,
+ "ViewBackgroundShape::prefetch(): Could not create Renderer" );
+
+ pRenderer->setTransformation( aShapeTransform );
+ pRenderer->draw();
+
+ mxBitmap = pBitmap->getUNOBitmap();
+ }
+
+ mpLastMtf = rMtf;
+ maLastTransformation = rCanvasTransform;
+
+ return mxBitmap.is();
+ }
+
+ ViewBackgroundShape::ViewBackgroundShape( const ViewLayerSharedPtr& rViewLayer,
+ const ::basegfx::B2DRectangle& rShapeBounds ) :
+ mpViewLayer( rViewLayer ),
+ mxBitmap(),
+ mpLastMtf(),
+ maLastTransformation(),
+ maBounds( rShapeBounds )
+ {
+ ENSURE_OR_THROW( mpViewLayer, "ViewBackgroundShape::ViewBackgroundShape(): Invalid View" );
+ ENSURE_OR_THROW( mpViewLayer->getCanvas(), "ViewBackgroundShape::ViewBackgroundShape(): Invalid ViewLayer canvas" );
+ }
+
+ const ViewLayerSharedPtr& ViewBackgroundShape::getViewLayer() const
+ {
+ return mpViewLayer;
+ }
+
+ bool ViewBackgroundShape::render( const GDIMetaFileSharedPtr& rMtf ) const
+ {
+ SAL_INFO( "slideshow", "::presentation::internal::ViewBackgroundShape::draw()" );
+
+ const ::cppcanvas::CanvasSharedPtr& rDestinationCanvas( mpViewLayer->getCanvas() );
+
+ if( !prefetch( rDestinationCanvas, rMtf ) )
+ return false;
+
+ ENSURE_OR_RETURN_FALSE( mxBitmap.is(),
+ "ViewBackgroundShape::draw(): Invalid background bitmap" );
+
+ ::basegfx::B2DHomMatrix aTransform( mpViewLayer->getTransformation() );
+
+ // invert the linear part of the view transformation
+ // (i.e. the view transformation without translational
+ // components), to be able to leave the canvas
+ // transformation intact (would otherwise destroy possible
+ // clippings, as the clip polygon is relative to the view
+ // coordinate system).
+ aTransform.set(0,2, 0.0 );
+ aTransform.set(1,2, 0.0 );
+ aTransform.invert();
+
+ rendering::RenderState aRenderState;
+ ::canvas::tools::initRenderState( aRenderState );
+
+ ::canvas::tools::setRenderStateTransform( aRenderState, aTransform );
+
+ try
+ {
+ rDestinationCanvas->getUNOCanvas()->drawBitmap( mxBitmap,
+ rDestinationCanvas->getViewState(),
+ aRenderState );
+ }
+ catch( uno::Exception& )
+ {
+ TOOLS_WARN_EXCEPTION( "slideshow", "" );
+ return false;
+ }
+
+ return true;
+ }
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */