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 <tools/diagnose_ex.h>
  23 #include <sal/log.hxx>
  24
  25 #include "viewbackgroundshape.hxx"
  26 #include <tools.hxx>
  27
  28 #include <rtl/math.hxx>
  29
  30 #include <comphelper/anytostring.hxx>
  31 #include <cppuhelper/exc_hlp.hxx>
  32
  33 #include <basegfx/polygon/b2dpolygontools.hxx>
  34 #include <basegfx/polygon/b2dpolygon.hxx>
  35 #include <basegfx/numeric/ftools.hxx>
  36 #include <basegfx/matrix/b2dhommatrix.hxx>
  37 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  38
  39 #include <com/sun/star/rendering/XCanvas.hpp>
  40
  41 #include <canvas/canvastools.hxx>
  42 #include <cppcanvas/vclfactory.hxx>
  43 #include <cppcanvas/basegfxfactory.hxx>
  44 #include <cppcanvas/renderer.hxx>
  45 #include <cppcanvas/bitmap.hxx>
  46
  47 using namespace ::com::sun::star;
  48
  49
  50 namespace slideshow
  51 {
  52     namespace internal
  53     {
  54
  55         bool ViewBackgroundShape::prefetch( const ::cppcanvas::CanvasSharedPtr& rDestinationCanvas,
  56                                             const GDIMetaFileSharedPtr&         rMtf ) const
  57         {
  58             SAL_INFO( "slideshow", "::presentation::internal::ViewBackgroundShape::prefetch()" );
  59             ENSURE_OR_RETURN_FALSE( rMtf,
  60                                "ViewBackgroundShape::prefetch(): no valid metafile!" );
  61
  62             const ::basegfx::B2DHomMatrix& rCanvasTransform(
  63                 mpViewLayer->getTransformation() );
  64
  65             if( !mxBitmap.is() ||
  66                 rMtf != mpLastMtf ||
  67                 rCanvasTransform != maLastTransformation )
  68             {
  69                 // buffered bitmap is invalid, re-create
  70
  71                 // determine transformed page bounds
  72                 ::basegfx::B2DRectangle aTmpRect;
  73                 ::canvas::tools::calcTransformedRectBounds( aTmpRect,
  74                                                             maBounds,
  75                                                             rCanvasTransform );
  76
  77                 // determine pixel size of bitmap (choose it one pixel
  78                 // larger, as polygon rendering takes one pixel more
  79                 // to the right and to the bottom)
  80                 const ::basegfx::B2ISize aBmpSizePixel(
  81                     ::basegfx::fround( aTmpRect.getRange().getX() + 1),
  82                     ::basegfx::fround( aTmpRect.getRange().getY() + 1) );
  83
  84                 // create a bitmap of appropriate size
  85                 ::cppcanvas::BitmapSharedPtr pBitmap(
  86                     ::cppcanvas::BaseGfxFactory::createBitmap(
  87                         rDestinationCanvas,
  88                         aBmpSizePixel ) );
  89
  90                 ENSURE_OR_THROW( pBitmap,
  91                                   "ViewBackgroundShape::prefetch(): Cannot create background bitmap" );
  92
  93                 ::cppcanvas::BitmapCanvasSharedPtr pBitmapCanvas( pBitmap->getBitmapCanvas() );
  94
  95                 ENSURE_OR_THROW( pBitmapCanvas,
  96                                   "ViewBackgroundShape::prefetch(): Cannot create background bitmap canvas" );
  97
  98                 // clear bitmap
  99                 initSlideBackground( pBitmapCanvas,
 100                                      aBmpSizePixel );
 101
 102                 // apply linear part of destination canvas transformation (linear means in this context:
 103                 // transformation without any translational components)
 104                 ::basegfx::B2DHomMatrix aLinearTransform( rCanvasTransform );
 105                 aLinearTransform.set( 0, 2, 0.0 );
 106                 aLinearTransform.set( 1, 2, 0.0 );
 107                 pBitmapCanvas->setTransformation( aLinearTransform );
 108
 109                 const basegfx::B2DHomMatrix aShapeTransform(basegfx::utils::createScaleTranslateB2DHomMatrix(
 110                     maBounds.getWidth(), maBounds.getHeight(),
 111                     maBounds.getMinX(), maBounds.getMinY()));
 112
 113                 ::cppcanvas::RendererSharedPtr pRenderer(
 114                     ::cppcanvas::VCLFactory::createRenderer(
 115                         pBitmapCanvas,
 116                         *rMtf,
 117                         ::cppcanvas::Renderer::Parameters() ) );
 118
 119                 ENSURE_OR_RETURN_FALSE( pRenderer,
 120                                    "ViewBackgroundShape::prefetch(): Could not create Renderer" );
 121
 122                 pRenderer->setTransformation( aShapeTransform );
 123                 pRenderer->draw();
 124
 125                 mxBitmap = pBitmap->getUNOBitmap();
 126             }
 127
 128             mpLastMtf            = rMtf;
 129             maLastTransformation = rCanvasTransform;
 130
 131             return mxBitmap.is();
 132         }
 133
 134         ViewBackgroundShape::ViewBackgroundShape( const ViewLayerSharedPtr&         rViewLayer,
 135                                                   const ::basegfx::B2DRectangle&    rShapeBounds ) :
 136             mpViewLayer( rViewLayer ),
 137             mxBitmap(),
 138             mpLastMtf(),
 139             maLastTransformation(),
 140             maBounds( rShapeBounds )
 141         {
 142             ENSURE_OR_THROW( mpViewLayer, "ViewBackgroundShape::ViewBackgroundShape(): Invalid View" );
 143             ENSURE_OR_THROW( mpViewLayer->getCanvas(), "ViewBackgroundShape::ViewBackgroundShape(): Invalid ViewLayer canvas" );
 144         }
 145
 146         const ViewLayerSharedPtr& ViewBackgroundShape::getViewLayer() const
 147         {
 148             return mpViewLayer;
 149         }
 150
 151         bool ViewBackgroundShape::render( const GDIMetaFileSharedPtr& rMtf ) const
 152         {
 153             SAL_INFO( "slideshow", "::presentation::internal::ViewBackgroundShape::draw()" );
 154
 155             const ::cppcanvas::CanvasSharedPtr& rDestinationCanvas( mpViewLayer->getCanvas() );
 156
 157             if( !prefetch( rDestinationCanvas, rMtf ) )
 158                 return false;
 159
 160             ENSURE_OR_RETURN_FALSE( mxBitmap.is(),
 161                                "ViewBackgroundShape::draw(): Invalid background bitmap" );
 162
 163             ::basegfx::B2DHomMatrix aTransform( mpViewLayer->getTransformation() );
 164
 165             // invert the linear part of the view transformation
 166             // (i.e. the view transformation without translational
 167             // components), to be able to leave the canvas
 168             // transformation intact (would otherwise destroy possible
 169             // clippings, as the clip polygon is relative to the view
 170             // coordinate system).
 171             aTransform.set(0,2, 0.0 );
 172             aTransform.set(1,2, 0.0 );
 173             aTransform.invert();
 174
 175             rendering::RenderState aRenderState;
 176             ::canvas::tools::initRenderState( aRenderState );
 177
 178             ::canvas::tools::setRenderStateTransform( aRenderState, aTransform );
 179
 180             try
 181             {
 182                 rDestinationCanvas->getUNOCanvas()->drawBitmap( mxBitmap,
 183                                                                 rDestinationCanvas->getViewState(),
 184                                                                 aRenderState );
 185             }
 186             catch( uno::Exception& )
 187             {
 188                 TOOLS_WARN_EXCEPTION( "slideshow", "" );
 189                 return false;
 190             }
 191
 192             return true;
 193         }
 194
 195     }
 196 }
 197
 198 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */