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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 .
*/
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include "combtransition.hxx"
namespace slideshow::internal {
namespace {
basegfx::B2DPolyPolygon createClipPolygon(
const ::basegfx::B2DVector& rDirection,
const ::basegfx::B2DSize& rSlideSize,
int nNumStrips, int nOffset )
{
// create clip polygon in standard orientation (will later
// be rotated to match direction vector)
::basegfx::B2DPolyPolygon aClipPoly;
// create nNumStrips/2 vertical strips
for( int i=nOffset; i<nNumStrips; i+=2 )
{
aClipPoly.append(
::basegfx::utils::createPolygonFromRect(
::basegfx::B2DRectangle( double(i)/nNumStrips, 0.0,
double(i+1)/nNumStrips, 1.0) ) );
}
// rotate polygons, such that the strips are parallel to
// the given direction vector
const ::basegfx::B2DVector aUpVec(0.0, 1.0);
basegfx::B2DHomMatrix aMatrix(basegfx::utils::createRotateAroundPoint(0.5, 0.5, aUpVec.angle( rDirection )));
// blow up clip polygon to slide size
aMatrix.scale( rSlideSize.getX(),
rSlideSize.getY() );
aClipPoly.transform( aMatrix );
return aClipPoly;
}
}
CombTransition::CombTransition(
std::optional<SlideSharedPtr> const & leavingSlide,
const SlideSharedPtr& pEnteringSlide,
const SoundPlayerSharedPtr& pSoundPlayer,
const UnoViewContainer& rViewContainer,
ScreenUpdater& rScreenUpdater,
EventMultiplexer& rEventMultiplexer,
const ::basegfx::B2DVector& rPushDirection,
sal_Int32 nNumStripes )
: SlideChangeBase( leavingSlide, pEnteringSlide, pSoundPlayer,
rViewContainer, rScreenUpdater, rEventMultiplexer,
false /* no leaving sprite */,
false /* no entering sprite */ ),
maPushDirectionUnit( rPushDirection ),
mnNumStripes( nNumStripes )
{
}
void CombTransition::renderComb( double t,
const ViewEntry& rViewEntry ) const
{
const SlideBitmapSharedPtr& pEnteringBitmap = getEnteringBitmap(rViewEntry);
const cppcanvas::CanvasSharedPtr pCanvas_ = rViewEntry.mpView->getCanvas();
if( !pEnteringBitmap || !pCanvas_ )
return;
// calc bitmap offsets. The enter/leaving bitmaps are only
// as large as the actual slides. For scaled-down
// presentations, we have to move the left, top edge of
// those bitmaps to the actual position, governed by the
// given view transform. The aBitmapPosPixel local
// variable is already in device coordinate space
// (i.e. pixel).
// TODO(F2): Properly respect clip here. Might have to be transformed, too.
const basegfx::B2DHomMatrix viewTransform( rViewEntry.mpView->getTransformation() );
const basegfx::B2DPoint pageOrigin( viewTransform * basegfx::B2DPoint() );
// change transformation on cloned canvas to be in
// device pixel
cppcanvas::CanvasSharedPtr pCanvas( pCanvas_->clone() );
basegfx::B2DPoint p;
// TODO(Q2): Use basegfx bitmaps here
// TODO(F1): SlideBitmap is not fully portable between different canvases!
const basegfx::B2DSize enteringSizePixel(
getEnteringSlideSizePixel( rViewEntry.mpView) );
const basegfx::B2DVector aPushDirection(
enteringSizePixel * maPushDirectionUnit );
const basegfx::B2DPolyPolygon aClipPolygon1 =
createClipPolygon( maPushDirectionUnit,
enteringSizePixel,
mnNumStripes, 0 );
const basegfx::B2DPolyPolygon aClipPolygon2 =
createClipPolygon( maPushDirectionUnit,
enteringSizePixel,
mnNumStripes, 1 );
SlideBitmapSharedPtr const & pLeavingBitmap = getLeavingBitmap(rViewEntry);
if( pLeavingBitmap )
{
// render odd strips:
pLeavingBitmap->clip( aClipPolygon1 );
// don't modify bitmap object (no move!):
p = basegfx::B2DPoint( pageOrigin + (t * aPushDirection) );
pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
pLeavingBitmap->draw( pCanvas );
// render even strips:
pLeavingBitmap->clip( aClipPolygon2 );
// don't modify bitmap object (no move!):
p = basegfx::B2DPoint( pageOrigin - (t * aPushDirection) );
pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
pLeavingBitmap->draw( pCanvas );
}
// TODO(Q2): Use basegfx bitmaps here
// TODO(F1): SlideBitmap is not fully portable between different canvases!
// render odd strips:
pEnteringBitmap->clip( aClipPolygon1 );
// don't modify bitmap object (no move!):
p = basegfx::B2DPoint( pageOrigin + ((t - 1.0) * aPushDirection) );
pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
pEnteringBitmap->draw( pCanvas );
// render even strips:
pEnteringBitmap->clip( aClipPolygon2 );
// don't modify bitmap object (no move!):
p = basegfx::B2DPoint( pageOrigin + ((1.0 - t) * aPushDirection) );
pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY()));
pEnteringBitmap->draw( pCanvas );
}
bool CombTransition::operator()( double t )
{
std::for_each( beginViews(),
endViews(),
[this, &t]( const ViewEntry& rViewEntry )
{ return this->renderComb( t, rViewEntry ); } );
getScreenUpdater().notifyUpdate();
return true;
}
} // namespace slideshow::internal
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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