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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: */