summaryrefslogtreecommitdiffstats
path: root/slideshow/source/engine/transitions/clippingfunctor.cxx
diff options
context:
space:
mode:
Diffstat (limited to 'slideshow/source/engine/transitions/clippingfunctor.cxx')
-rw-r--r--slideshow/source/engine/transitions/clippingfunctor.cxx209
1 files changed, 209 insertions, 0 deletions
diff --git a/slideshow/source/engine/transitions/clippingfunctor.cxx b/slideshow/source/engine/transitions/clippingfunctor.cxx
new file mode 100644
index 000000000..be592ac49
--- /dev/null
+++ b/slideshow/source/engine/transitions/clippingfunctor.cxx
@@ -0,0 +1,209 @@
+/* -*- 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 <tools/diagnose_ex.h>
+#include "clippingfunctor.hxx"
+
+#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
+#include <basegfx/polygon/b2dpolypolygontools.hxx>
+#include <basegfx/polygon/b2dpolygontools.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+
+namespace slideshow::internal
+{
+ ClippingFunctor::ClippingFunctor(const ParametricPolyPolygonSharedPtr& rPolygon,
+ const TransitionInfo& rTransitionInfo,
+ bool bDirectionForward,
+ bool bModeIn ) :
+ mpParametricPoly( rPolygon ),
+ maStaticTransformation(),
+ mbForwardParameterSweep( true ),
+ mbSubtractPolygon( false ),
+ mbScaleIsotrophically( rTransitionInfo.mbScaleIsotrophically ),
+ mbFlip(false)
+ {
+ ENSURE_OR_THROW( rPolygon,
+ "ClippingFunctor::ClippingFunctor(): Invalid parametric polygon" );
+
+ // maBackgroundRect serves as the minuent when
+ // subtracting a given clip polygon from the
+ // background. To speed up the clipper algo, avoid
+ // actual intersections of the generated
+ // poly-polygon with the minuent - i.e. choose the
+ // polygon to subtract from sufficiently large.
+
+ // blow up unit rect to (-1,-1),(2,2)
+ // AW: Not needed, just use range
+ // ::basegfx::B2DHomMatrix aMatrix;
+ // aMatrix.scale(3.0,3.0);
+ // aMatrix.translate(-1.0,-1.0);
+ // maBackgroundRect.transform( aMatrix );
+
+ // extract modification info from maTransitionInfo
+
+
+ // perform general transformations _before_ the reverse
+ // mode changes. This allows the Transition table to be
+ // filled more consistently (otherwise, when e.g. rotating
+ // a clip 90 degrees, the ReverseMethod::FlipX becomes
+ // ReverseMethod::FlipY instead)
+ if (rTransitionInfo.mnRotationAngle != 0.0 ||
+ rTransitionInfo.mnScaleX != 1.0 ||
+ rTransitionInfo.mnScaleY != 1.0)
+ {
+ maStaticTransformation.translate( -0.5, -0.5 );
+ // apply further transformations:
+ if (rTransitionInfo.mnRotationAngle != 0.0)
+ {
+ maStaticTransformation.rotate(
+ basegfx::deg2rad(rTransitionInfo.mnRotationAngle) );
+ }
+ if (rTransitionInfo.mnScaleX != 1.0 ||
+ rTransitionInfo.mnScaleY != 1.0)
+ {
+ maStaticTransformation.scale(
+ rTransitionInfo.mnScaleX,
+ rTransitionInfo.mnScaleY );
+ }
+ maStaticTransformation.translate( 0.5, 0.5 );
+ }
+
+ if( !bDirectionForward )
+ {
+ // Client has requested reversed
+ // direction. Apply TransitionInfo's choice
+ // for that
+ switch( rTransitionInfo.meReverseMethod )
+ {
+ default:
+ ENSURE_OR_THROW(
+ false,
+ "TransitionFactory::TransitionFactory(): Unexpected reverse method" );
+ break;
+
+ case TransitionInfo::ReverseMethod::Ignore:
+ break;
+
+ case TransitionInfo::ReverseMethod::SubtractAndInvert:
+ mbForwardParameterSweep = !mbForwardParameterSweep;
+ mbSubtractPolygon = !mbSubtractPolygon;
+ break;
+
+ case TransitionInfo::ReverseMethod::Rotate180:
+ maStaticTransformation = basegfx::utils::createRotateAroundPoint(0.5, 0.5, M_PI)
+ * maStaticTransformation;
+ break;
+
+ case TransitionInfo::ReverseMethod::FlipX:
+ maStaticTransformation = basegfx::utils::createScaleTranslateB2DHomMatrix(-1.0, 1.0, 1.0, 0.0)
+ * maStaticTransformation;
+ mbFlip = true;
+ break;
+
+ case TransitionInfo::ReverseMethod::FlipY:
+ maStaticTransformation = basegfx::utils::createScaleTranslateB2DHomMatrix(1.0, -1.0, 0.0, 1.0)
+ * maStaticTransformation;
+ mbFlip = true;
+ break;
+ }
+ }
+
+ if( !bModeIn )
+ {
+ // client has requested 'out' mode. Apply
+ // TransitionInfo's method of choice
+ if( rTransitionInfo.mbOutInvertsSweep )
+ mbForwardParameterSweep = !mbForwardParameterSweep;
+ else
+ mbSubtractPolygon = !mbSubtractPolygon;
+ }
+ }
+
+ ::basegfx::B2DPolyPolygon ClippingFunctor::operator()( double nValue,
+ const ::basegfx::B2DSize& rTargetSize )
+ {
+ // modify clip polygon according to static
+ // transformation plus current shape size
+ ::basegfx::B2DHomMatrix aMatrix( maStaticTransformation );
+
+ // retrieve current clip polygon
+ ::basegfx::B2DPolyPolygon aClipPoly = (*mpParametricPoly)(
+ mbForwardParameterSweep ? nValue : 1.0 - nValue );
+
+ // TODO(Q4): workaround here, better be fixed in cppcanvas
+ if (aClipPoly.count() == 0)
+ aClipPoly.append( basegfx::B2DPolygon() );
+
+ if (mbFlip)
+ aClipPoly.flip();
+
+ if( mbSubtractPolygon )
+ {
+ // subtract given polygon from background
+ // rect. Do that before any transformations.
+
+ // calc maBackgroundRect \ aClipPoly
+ // =================================
+
+ // AW: Simplified
+ // use a range with fixed size (-1,-1),(2,2)
+ const basegfx::B2DRange aBackgroundRange(-1, -1, 2, 2);
+ const basegfx::B2DRange aClipPolyRange(aClipPoly.getB2DRange());
+
+ if(aBackgroundRange.isInside(aClipPolyRange))
+ {
+ // combine polygons; make the clip polygon the hole
+ aClipPoly = ::basegfx::utils::correctOrientations(aClipPoly);
+ aClipPoly.flip();
+ aClipPoly.insert(0, basegfx::utils::createPolygonFromRect(aBackgroundRange));
+ }
+ else
+ {
+ // when not completely inside aBackgroundRange clipping is needed
+ // subtract aClipPoly from aBackgroundRange
+ const basegfx::B2DPolyPolygon aBackgroundPolyPoly(basegfx::utils::createPolygonFromRect(aBackgroundRange));
+ aClipPoly = basegfx::utils::solvePolygonOperationDiff(aBackgroundPolyPoly, aClipPoly);
+ }
+ }
+
+ // scale polygon up to current shape size
+ if( mbScaleIsotrophically )
+ {
+ const double nScale( ::std::max( rTargetSize.getX(),
+ rTargetSize.getY() ) );
+ aMatrix.scale( nScale, nScale );
+ aMatrix.translate( -(nScale-rTargetSize.getX())/2.0,
+ -(nScale-rTargetSize.getY())/2.0 );
+ }
+ else
+ {
+ aMatrix.scale( rTargetSize.getX(),
+ rTargetSize.getY() );
+ }
+
+ // apply cumulative transformation to clip polygon
+ aClipPoly.transform( aMatrix );
+
+ return aClipPoly;
+ }
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */