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