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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 <canvas/debug.hxx>
22 : #include <tools/diagnose_ex.h>
23 : #include "clippingfunctor.hxx"
24 : #include "transitiontools.hxx"
25 :
26 : #include <basegfx/polygon/b2dpolypolygoncutter.hxx>
27 : #include <basegfx/polygon/b2dpolygonclipper.hxx>
28 : #include <basegfx/polygon/b2dpolygontools.hxx>
29 : #include <basegfx/matrix/b2dhommatrixtools.hxx>
30 :
31 : namespace slideshow
32 : {
33 : namespace internal
34 : {
35 0 : ClippingFunctor::ClippingFunctor(const ParametricPolyPolygonSharedPtr& rPolygon,
36 : const TransitionInfo& rTransitionInfo,
37 : bool bDirectionForward,
38 : bool bModeIn ) :
39 : mpParametricPoly( rPolygon ),
40 : maStaticTransformation(),
41 : mbForwardParameterSweep( true ),
42 : mbSubtractPolygon( false ),
43 : mbScaleIsotrophically( rTransitionInfo.mbScaleIsotrophically ),
44 0 : mbFlip(false)
45 : {
46 0 : ENSURE_OR_THROW( rPolygon,
47 : "ClippingFunctor::ClippingFunctor(): Invalid parametric polygon" );
48 :
49 : // maBackgroundRect serves as the minuent when
50 : // subtracting a given clip polygon from the
51 : // background. To speed up the clipper algo, avoid
52 : // actual intersections of the generated
53 : // poly-polygon with the minuent - i.e. choose the
54 : // polygon to subtract from sufficiently large.
55 :
56 : // blow up unit rect to (-1,-1),(2,2)
57 : // AW: Not needed, just use range
58 : // ::basegfx::B2DHomMatrix aMatrix;
59 : // aMatrix.scale(3.0,3.0);
60 : // aMatrix.translate(-1.0,-1.0);
61 : // maBackgroundRect.transform( aMatrix );
62 :
63 : // extract modification info from maTransitionInfo
64 :
65 :
66 : // perform general transformations _before_ the reverse
67 : // mode changes. This allows the Transition table to be
68 : // filled more constitently (otherwise, when e.g. rotating
69 : // a clip 90 degrees, the REVERSEMETHOD_FLIP_X becomes
70 : // REVERSEMETHOD_FLIP_Y instead)
71 0 : if (rTransitionInfo.mnRotationAngle != 0.0 ||
72 0 : rTransitionInfo.mnScaleX != 1.0 ||
73 0 : rTransitionInfo.mnScaleY != 1.0)
74 : {
75 0 : maStaticTransformation.translate( -0.5, -0.5 );
76 : // apply further transformations:
77 0 : if (rTransitionInfo.mnRotationAngle != 0.0)
78 : {
79 : maStaticTransformation.rotate(
80 0 : basegfx::deg2rad(rTransitionInfo.mnRotationAngle) );
81 : }
82 0 : if (rTransitionInfo.mnScaleX != 1.0 ||
83 0 : rTransitionInfo.mnScaleY != 1.0)
84 : {
85 : maStaticTransformation.scale(
86 : rTransitionInfo.mnScaleX,
87 0 : rTransitionInfo.mnScaleY );
88 : }
89 0 : maStaticTransformation.translate( 0.5, 0.5 );
90 : }
91 :
92 0 : if( !bDirectionForward )
93 : {
94 : // Client has requested reversed
95 : // direction. Apply TransitionInfo's choice
96 : // for that
97 0 : switch( rTransitionInfo.meReverseMethod )
98 : {
99 : default:
100 0 : ENSURE_OR_THROW(
101 : false,
102 : "TransitionFactory::TransitionFactory(): Unexpected reverse method" );
103 : break;
104 :
105 : case TransitionInfo::REVERSEMETHOD_IGNORE:
106 0 : break;
107 :
108 : case TransitionInfo::REVERSEMETHOD_INVERT_SWEEP:
109 0 : mbForwardParameterSweep = !mbForwardParameterSweep;
110 0 : break;
111 :
112 : case TransitionInfo::REVERSEMETHOD_SUBTRACT_POLYGON:
113 0 : mbSubtractPolygon = !mbSubtractPolygon;
114 0 : break;
115 :
116 : case TransitionInfo::REVERSEMETHOD_SUBTRACT_AND_INVERT:
117 0 : mbForwardParameterSweep = !mbForwardParameterSweep;
118 0 : mbSubtractPolygon = !mbSubtractPolygon;
119 0 : break;
120 :
121 : case TransitionInfo::REVERSEMETHOD_ROTATE_180:
122 0 : maStaticTransformation = basegfx::tools::createRotateAroundPoint(0.5, 0.5, M_PI)
123 0 : * maStaticTransformation;
124 0 : break;
125 :
126 : case TransitionInfo::REVERSEMETHOD_FLIP_X:
127 0 : maStaticTransformation = basegfx::tools::createScaleTranslateB2DHomMatrix(-1.0, 1.0, 1.0, 0.0)
128 0 : * maStaticTransformation;
129 0 : mbFlip = true;
130 0 : break;
131 :
132 : case TransitionInfo::REVERSEMETHOD_FLIP_Y:
133 0 : maStaticTransformation = basegfx::tools::createScaleTranslateB2DHomMatrix(1.0, -1.0, 0.0, 1.0)
134 0 : * maStaticTransformation;
135 0 : mbFlip = true;
136 0 : break;
137 : }
138 : }
139 :
140 0 : if( !bModeIn )
141 : {
142 : // client has requested 'out' mode. Apply
143 : // TransitionInfo's method of choice
144 0 : if( rTransitionInfo.mbOutInvertsSweep )
145 0 : mbForwardParameterSweep = !mbForwardParameterSweep;
146 : else
147 0 : mbSubtractPolygon = !mbSubtractPolygon;
148 : }
149 0 : }
150 :
151 0 : ::basegfx::B2DPolyPolygon ClippingFunctor::operator()( double nValue,
152 : const ::basegfx::B2DSize& rTargetSize )
153 : {
154 : // modify clip polygon according to static
155 : // transformation plus current shape size
156 0 : ::basegfx::B2DHomMatrix aMatrix( maStaticTransformation );
157 :
158 : // retrieve current clip polygon
159 0 : ::basegfx::B2DPolyPolygon aClipPoly = (*mpParametricPoly)(
160 0 : mbForwardParameterSweep ? nValue : 1.0 - nValue );
161 :
162 : // TODO(Q4): workaround here, better be fixed in cppcanvas
163 0 : if (aClipPoly.count() == 0)
164 0 : aClipPoly.append( basegfx::B2DPolygon() );
165 :
166 0 : if (mbFlip)
167 0 : aClipPoly.flip();
168 :
169 : // currently, clipper cannot cope with curves. Subdivide first
170 : // AW: Should be no longer necessary; clipping tools are now bezier-safe
171 : // if( aClipPoly.areControlPointsUsed() )
172 : // aClipPoly = ::basegfx::tools::adaptiveSubdivideByAngle(aClipPoly);
173 :
174 0 : if( mbSubtractPolygon )
175 : {
176 : // subtract given polygon from background
177 : // rect. Do that before any transformations.
178 :
179 : // calc maBackgroundRect \ aClipPoly
180 : // =================================
181 :
182 : // AW: Simplified
183 : // use a range with fixed size (-1,-1),(2,2)
184 0 : const basegfx::B2DRange aBackgroundRange(-1, -1, 2, 2);
185 0 : const basegfx::B2DRange aClipPolyRange(aClipPoly.getB2DRange());
186 :
187 0 : if(aBackgroundRange.isInside(aClipPolyRange))
188 : {
189 : // combine polygons; make the clip polygon the hole
190 0 : aClipPoly = ::basegfx::tools::correctOrientations(aClipPoly);
191 0 : aClipPoly.flip();
192 0 : aClipPoly.insert(0, basegfx::tools::createPolygonFromRect(aBackgroundRange));
193 : }
194 : else
195 : {
196 : // when not completely inside aBackgroundRange clipping is needed
197 : // subtract aClipPoly from aBackgroundRange
198 0 : const basegfx::B2DPolyPolygon aBackgroundPolyPoly(basegfx::tools::createPolygonFromRect(aBackgroundRange));
199 0 : aClipPoly = basegfx::tools::solvePolygonOperationDiff(aBackgroundPolyPoly, aClipPoly);
200 : }
201 : }
202 :
203 : // scale polygon up to current shape size
204 0 : if( mbScaleIsotrophically )
205 : {
206 0 : const double nScale( ::std::max( rTargetSize.getX(),
207 0 : rTargetSize.getY() ) );
208 0 : aMatrix.scale( nScale, nScale );
209 0 : aMatrix.translate( -(nScale-rTargetSize.getX())/2.0,
210 0 : -(nScale-rTargetSize.getY())/2.0 );
211 : }
212 : else
213 : {
214 : aMatrix.scale( rTargetSize.getX(),
215 0 : rTargetSize.getY() );
216 : }
217 :
218 : // apply cumulative transformation to clip polygon
219 0 : aClipPoly.transform( aMatrix );
220 :
221 0 : return aClipPoly;
222 : }
223 :
224 : }
225 : }
226 :
227 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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