slideshow/source/engine/shapes/viewbackgroundshape.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
  21 // must be first
  22 #include <comphelper/diagnose_ex.hxx>
  23 #include <sal/log.hxx>
  24
  25 #include "viewbackgroundshape.hxx"
  26 #include <tools.hxx>
  27
  28 #include <basegfx/numeric/ftools.hxx>
  29 #include <basegfx/matrix/b2dhommatrix.hxx>
  30 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  31
  32 #include <com/sun/star/rendering/XCanvas.hpp>
  33
  34 #include <canvas/canvastools.hxx>
  35 #include <cppcanvas/vclfactory.hxx>
  36 #include <cppcanvas/basegfxfactory.hxx>
  37 #include <cppcanvas/renderer.hxx>
  38 #include <cppcanvas/bitmap.hxx>
  39 #include <utility>
  40
  41 using namespace ::com::sun::star;
  42
  43
  44 namespace slideshow::internal
  45 {
  46
  47         bool ViewBackgroundShape::prefetch( const ::cppcanvas::CanvasSharedPtr& rDestinationCanvas,
  48                                             const GDIMetaFileSharedPtr&         rMtf ) const
  49         {
  50             SAL_INFO( "slideshow", "::presentation::internal::ViewBackgroundShape::prefetch()" );
  51             ENSURE_OR_RETURN_FALSE( rMtf,
  52                                "ViewBackgroundShape::prefetch(): no valid metafile!" );
  53
  54             const ::basegfx::B2DHomMatrix& rCanvasTransform(
  55                 mpViewLayer->getTransformation() );
  56
  57             if( !mxBitmap.is() ||
  58                 rMtf != mpLastMtf ||
  59                 rCanvasTransform != maLastTransformation )
  60             {
  61                 // buffered bitmap is invalid, re-create
  62
  63                 // determine transformed page bounds
  64                 ::basegfx::B2DRectangle aTmpRect;
  65                 ::canvas::tools::calcTransformedRectBounds( aTmpRect,
  66                                                             maBounds,
  67                                                             rCanvasTransform );
  68
  69                 // determine pixel size of bitmap (choose it one pixel
  70                 // larger, as polygon rendering takes one pixel more
  71                 // to the right and to the bottom)
  72                 const ::basegfx::B2ISize aBmpSizePixel(
  73                     ::basegfx::fround( aTmpRect.getRange().getX() + 1),
  74                     ::basegfx::fround( aTmpRect.getRange().getY() + 1) );
  75
  76                 // create a bitmap of appropriate size
  77                 ::cppcanvas::BitmapSharedPtr pBitmap(
  78                     ::cppcanvas::BaseGfxFactory::createBitmap(
  79                         rDestinationCanvas,
  80                         aBmpSizePixel ) );
  81
  82                 ENSURE_OR_THROW( pBitmap,
  83                                   "ViewBackgroundShape::prefetch(): Cannot create background bitmap" );
  84
  85                 ::cppcanvas::BitmapCanvasSharedPtr pBitmapCanvas( pBitmap->getBitmapCanvas() );
  86
  87                 ENSURE_OR_THROW( pBitmapCanvas,
  88                                   "ViewBackgroundShape::prefetch(): Cannot create background bitmap canvas" );
  89
  90                 // clear bitmap
  91                 initSlideBackground( pBitmapCanvas,
  92                                      aBmpSizePixel );
  93
  94                 // apply linear part of destination canvas transformation (linear means in this context:
  95                 // transformation without any translational components)
  96                 ::basegfx::B2DHomMatrix aLinearTransform( rCanvasTransform );
  97                 aLinearTransform.set( 0, 2, 0.0 );
  98                 aLinearTransform.set( 1, 2, 0.0 );
  99                 pBitmapCanvas->setTransformation( aLinearTransform );
 100
 101                 const basegfx::B2DHomMatrix aShapeTransform(basegfx::utils::createScaleTranslateB2DHomMatrix(
 102                     maBounds.getWidth(), maBounds.getHeight(),
 103                     maBounds.getMinX(), maBounds.getMinY()));
 104
 105                 ::cppcanvas::RendererSharedPtr pRenderer(
 106                     ::cppcanvas::VCLFactory::createRenderer(
 107                         pBitmapCanvas,
 108                         *rMtf,
 109                         ::cppcanvas::Renderer::Parameters() ) );
 110
 111                 ENSURE_OR_RETURN_FALSE( pRenderer,
 112                                    "ViewBackgroundShape::prefetch(): Could not create Renderer" );
 113
 114                 pRenderer->setTransformation( aShapeTransform );
 115                 pRenderer->draw();
 116
 117                 mxBitmap = pBitmap->getUNOBitmap();
 118             }
 119
 120             mpLastMtf            = rMtf;
 121             maLastTransformation = rCanvasTransform;
 122
 123             return mxBitmap.is();
 124         }
 125
 126         ViewBackgroundShape::ViewBackgroundShape( ViewLayerSharedPtr                xViewLayer,
 127                                                   const ::basegfx::B2DRectangle&    rShapeBounds ) :
 128             mpViewLayer(std::move( xViewLayer )),
 129             mxBitmap(),
 130             mpLastMtf(),
 131             maLastTransformation(),
 132             maBounds( rShapeBounds )
 133         {
 134             ENSURE_OR_THROW( mpViewLayer, "ViewBackgroundShape::ViewBackgroundShape(): Invalid View" );
 135             ENSURE_OR_THROW( mpViewLayer->getCanvas(), "ViewBackgroundShape::ViewBackgroundShape(): Invalid ViewLayer canvas" );
 136         }
 137
 138         const ViewLayerSharedPtr& ViewBackgroundShape::getViewLayer() const
 139         {
 140             return mpViewLayer;
 141         }
 142
 143         bool ViewBackgroundShape::render( const GDIMetaFileSharedPtr& rMtf ) const
 144         {
 145             SAL_INFO( "slideshow", "::presentation::internal::ViewBackgroundShape::draw()" );
 146
 147             const ::cppcanvas::CanvasSharedPtr& rDestinationCanvas( mpViewLayer->getCanvas() );
 148
 149             if( !prefetch( rDestinationCanvas, rMtf ) )
 150                 return false;
 151
 152             ENSURE_OR_RETURN_FALSE( mxBitmap.is(),
 153                                "ViewBackgroundShape::draw(): Invalid background bitmap" );
 154
 155             ::basegfx::B2DHomMatrix aTransform( mpViewLayer->getTransformation() );
 156
 157             // invert the linear part of the view transformation
 158             // (i.e. the view transformation without translational
 159             // components), to be able to leave the canvas
 160             // transformation intact (would otherwise destroy possible
 161             // clippings, as the clip polygon is relative to the view
 162             // coordinate system).
 163             aTransform.set(0,2, 0.0 );
 164             aTransform.set(1,2, 0.0 );
 165             aTransform.invert();
 166
 167             rendering::RenderState aRenderState;
 168             ::canvas::tools::initRenderState( aRenderState );
 169
 170             ::canvas::tools::setRenderStateTransform( aRenderState, aTransform );
 171
 172             try
 173             {
 174                 rDestinationCanvas->getUNOCanvas()->drawBitmap( mxBitmap,
 175                                                                 rDestinationCanvas->getViewState(),
 176                                                                 aRenderState );
 177             }
 178             catch( uno::Exception& )
 179             {
 180                 TOOLS_WARN_EXCEPTION( "slideshow", "" );
 181                 return false;
 182             }
 183
 184             return true;
 185         }
 186
 187 }
 188
 189 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */