slideshow/source/engine/transitions/combtransition.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.
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   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 #include <basegfx/polygon/b2dpolygon.hxx>
  22 #include <basegfx/polygon/b2dpolygontools.hxx>
  23 #include <basegfx/matrix/b2dhommatrix.hxx>
  24 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  25
  26 #include <cppcanvas/spritecanvas.hxx>
  27
  28 #include "combtransition.hxx"
  29
  30 namespace slideshow {
  31 namespace internal {
  32
  33 namespace {
  34
  35 basegfx::B2DPolyPolygon createClipPolygon(
  36     const ::basegfx::B2DVector& rDirection,
  37     const ::basegfx::B2DSize& rSlideSize,
  38     int nNumStrips, int nOffset )
  39 {
  40     // create clip polygon in standard orientation (will later
  41     // be rotated to match direction vector)
  42     ::basegfx::B2DPolyPolygon aClipPoly;
  43
  44     // create nNumStrips/2 vertical strips
  45     for( int i=nOffset; i<nNumStrips; i+=2 )
  46     {
  47         aClipPoly.append(
  48             ::basegfx::utils::createPolygonFromRect(
  49                 ::basegfx::B2DRectangle( double(i)/nNumStrips, 0.0,
  50                                          double(i+1)/nNumStrips, 1.0) ) );
  51
  52     }
  53
  54     // rotate polygons, such that the strips are parallel to
  55     // the given direction vector
  56     const ::basegfx::B2DVector aUpVec(0.0, 1.0);
  57     basegfx::B2DHomMatrix aMatrix(basegfx::utils::createRotateAroundPoint(0.5, 0.5, aUpVec.angle( rDirection )));
  58
  59     // blow up clip polygon to slide size
  60     aMatrix.scale( rSlideSize.getX(),
  61                    rSlideSize.getY() );
  62
  63     aClipPoly.transform( aMatrix );
  64
  65     return aClipPoly;
  66 }
  67
  68 }
  69
  70 CombTransition::CombTransition(
  71     boost::optional<SlideSharedPtr> const & leavingSlide,
  72     const SlideSharedPtr&                   pEnteringSlide,
  73     const SoundPlayerSharedPtr&             pSoundPlayer,
  74     const UnoViewContainer&                 rViewContainer,
  75     ScreenUpdater&                          rScreenUpdater,
  76     EventMultiplexer&                       rEventMultiplexer,
  77     const ::basegfx::B2DVector&             rPushDirection,
  78     sal_Int32                               nNumStripes )
  79     : SlideChangeBase( leavingSlide, pEnteringSlide, pSoundPlayer,
  80                        rViewContainer, rScreenUpdater, rEventMultiplexer,
  81                        false /* no leaving sprite */,
  82                        false /* no entering sprite */ ),
  83       maPushDirectionUnit( rPushDirection ),
  84       mnNumStripes( nNumStripes )
  85 {
  86 }
  87
  88 void CombTransition::renderComb( double           t,
  89                                  const ViewEntry& rViewEntry ) const
  90 {
  91     const SlideBitmapSharedPtr& pEnteringBitmap = getEnteringBitmap(rViewEntry);
  92     const cppcanvas::CanvasSharedPtr pCanvas_ = rViewEntry.mpView->getCanvas();
  93
  94     if( !pEnteringBitmap || !pCanvas_ )
  95         return;
  96
  97     // calc bitmap offsets. The enter/leaving bitmaps are only
  98     // as large as the actual slides. For scaled-down
  99     // presentations, we have to move the left, top edge of
 100     // those bitmaps to the actual position, governed by the
 101     // given view transform. The aBitmapPosPixel local
 102     // variable is already in device coordinate space
 103     // (i.e. pixel).
 104
 105     // TODO(F2): Properly respect clip here. Might have to be transformed, too.
 106     const basegfx::B2DHomMatrix viewTransform( rViewEntry.mpView->getTransformation() );
 107     const basegfx::B2DPoint pageOrigin( viewTransform * basegfx::B2DPoint() );
 108
 109     // change transformation on cloned canvas to be in
 110     // device pixel
 111     cppcanvas::CanvasSharedPtr pCanvas( pCanvas_->clone() );
 112     basegfx::B2DPoint p;
 113
 114     // TODO(Q2): Use basegfx bitmaps here
 115     // TODO(F1): SlideBitmap is not fully portable between different canvases!
 116
 117     const basegfx::B2DSize enteringSizePixel(
 118         getEnteringSlideSizePixel( rViewEntry.mpView) );
 119
 120     const basegfx::B2DVector aPushDirection = basegfx::B2DVector(
 121         enteringSizePixel * maPushDirectionUnit );
 122     const basegfx::B2DPolyPolygon aClipPolygon1 =
 123         createClipPolygon( maPushDirectionUnit,
 124                            enteringSizePixel,
 125                            mnNumStripes, 0 );
 126     const basegfx::B2DPolyPolygon aClipPolygon2 =
 127         createClipPolygon( maPushDirectionUnit,
 128                            enteringSizePixel,
 129                            mnNumStripes, 1 );
 130
 131     SlideBitmapSharedPtr const & pLeavingBitmap = getLeavingBitmap(rViewEntry);
 132     if( pLeavingBitmap )
 133     {
 134         // render odd strips:
 135         pLeavingBitmap->clip( aClipPolygon1 );
 136         // don't modify bitmap object (no move!):
 137         p = basegfx::B2DPoint( pageOrigin + (t * aPushDirection) );
 138         pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
 139         pLeavingBitmap->draw( pCanvas );
 140
 141         // render even strips:
 142         pLeavingBitmap->clip( aClipPolygon2 );
 143         // don't modify bitmap object (no move!):
 144         p = basegfx::B2DPoint( pageOrigin - (t * aPushDirection) );
 145         pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
 146         pLeavingBitmap->draw( pCanvas );
 147     }
 148
 149     // TODO(Q2): Use basegfx bitmaps here
 150     // TODO(F1): SlideBitmap is not fully portable between different canvases!
 151
 152     // render odd strips:
 153     pEnteringBitmap->clip( aClipPolygon1 );
 154     // don't modify bitmap object (no move!):
 155     p = basegfx::B2DPoint( pageOrigin + ((t - 1.0) * aPushDirection) );
 156     pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
 157     pEnteringBitmap->draw( pCanvas );
 158
 159     // render even strips:
 160     pEnteringBitmap->clip( aClipPolygon2 );
 161     // don't modify bitmap object (no move!):
 162     p = basegfx::B2DPoint( pageOrigin + ((1.0 - t) * aPushDirection) );
 163     pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
 164     pEnteringBitmap->draw( pCanvas );
 165 }
 166
 167 bool CombTransition::operator()( double t )
 168 {
 169     std::for_each( beginViews(),
 170                    endViews(),
 171                    [this, &t]( const ViewEntry& rViewEntry )
 172                    { return this->renderComb( t, rViewEntry ); } );
 173
 174     getScreenUpdater().notifyUpdate();
 175
 176     return true;
 177 }
 178
 179 } // namespace internal
 180 } // namespace presentation
 181
 182 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */