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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 : #ifndef _CPPCANVAS_CANVASGRAPHIC_HXX
21 : #define _CPPCANVAS_CANVASGRAPHIC_HXX
22 :
23 : #include <sal/types.h>
24 :
25 : #include <boost/shared_ptr.hpp>
26 : #include <cppcanvas/color.hxx>
27 : #include <cppcanvas/canvas.hxx>
28 :
29 : namespace basegfx
30 : {
31 : class B2DHomMatrix;
32 : class B2DPolyPolygon;
33 : }
34 :
35 :
36 : /* Definition of CanvasGraphic interface */
37 :
38 : namespace cppcanvas
39 : {
40 : // forward declaration, since PolyPolygon also derives from CanvasGraphic
41 : typedef ::boost::shared_ptr< class PolyPolygon > PolyPolygonSharedPtr;
42 :
43 :
44 : /** This interface defines basic properties of
45 : objects that can be painted on a Canvas
46 : */
47 0 : class CanvasGraphic
48 : {
49 : public:
50 :
51 : /** These enums determine how the primitive color is combined
52 : with the background. When performing this calculations, it
53 : is assumed that all color values are premultiplied with
54 : the corresponding alpha values (if no alpha is specified,
55 : 1.0 is assumed). Then, the following general compositing
56 : operation is performed:
57 :
58 : C = Ca * Fa + Cb * Fb
59 :
60 : where C is the result color, Ca and Cb are the input
61 : colors, premultiplied with alpha, and Fa and Fb are
62 : described for the different composite modes (wherein Aa
63 : and Ab denote source and destination alpha, respectively).
64 : */
65 : enum CompositeOp
66 : {
67 : /// Clear destination. Fa = Fb = 0.
68 : CLEAR,
69 :
70 : /// Copy source as-is to destination. Fa = 1, Fb = 0.
71 : SOURCE,
72 :
73 : /// Leave destination as-is. Fa = 0, Fb = 1.
74 : DESTINATION,
75 :
76 : /// Copy source over destination. Fa = 1, Fb = 1-Aa.
77 : OVER,
78 :
79 : /// Copy source under destination. Fa = 1-Ab, Fb = 1.
80 : UNDER,
81 :
82 : /// Copy source to destination, but limited to where the destination is. Fa = Ab, Fb = 0.
83 : INSIDE,
84 :
85 : /// Leave destination as is, but only where source was. Fa = 0, Fb = Aa.
86 : INSIDE_REVERSE,
87 :
88 : /// Copy source to destination, but limited to where destination is not. Fa = 1-Ab, Fb = 0.
89 : OUTSIDE,
90 :
91 : /// Leave destination as is, but only where source has not been. Fa = 0, Fb = 1-Aa.
92 : OUTSIDE_REVERSE,
93 :
94 : /// Copy source over destination, but only where destination is. Keep destination. Fa = Ab, Fb = 1-Aa.
95 : ATOP,
96 :
97 : /// Copy destination over source, but only where source is. Keep source. Fa = 1-Ab, Fb = Aa.
98 : ATOP_REVERSE,
99 :
100 : /// Take only parts where either source or destination, but not both are. Fa = 1-Ab, Fb = 1-Aa.
101 : XOR,
102 :
103 : /** simply add contributions of both source and destination. The
104 : resulting color values are limited to the permissible color
105 : range, and clipped to the maximal value, if exceeded. Fa = 1, Fb = 1.
106 : */
107 : ADD,
108 :
109 : /// Fa = min(1,(1-Ab)/Aa), Fb = 1
110 : SATURATE
111 : };
112 :
113 0 : virtual ~CanvasGraphic() {}
114 :
115 : /** Set object transformation matrix
116 : */
117 : virtual void setTransformation( const ::basegfx::B2DHomMatrix& rMatrix ) = 0;
118 : /** Get object transformation matrix
119 : */
120 : virtual ::basegfx::B2DHomMatrix getTransformation() const = 0;
121 :
122 : /** Set object clipping polygon
123 : */
124 : virtual void setClip( const ::basegfx::B2DPolyPolygon& rClipPoly ) = 0;
125 : /** Clear object clipping polygon
126 : */
127 : virtual void setClip() = 0;
128 : /** Get object clipping polygon
129 :
130 : @return NULL, if no clip is set; otherwise, the current clip poly-polygon is returned
131 : */
132 : virtual ::basegfx::B2DPolyPolygon const* getClip() const = 0;
133 :
134 : /** Set object composite mode
135 : */
136 : virtual void setCompositeOp( CompositeOp aOp ) = 0;
137 : /** Get object composite mode
138 : */
139 : virtual CompositeOp getCompositeOp() const = 0;
140 :
141 : /** Render to parent canvas
142 :
143 : This method renders the content to the parent canvas,
144 : i.e. the canvas this object was constructed for.
145 :
146 : @return whether the rendering finished successfully.
147 : */
148 : virtual bool draw() const = 0;
149 :
150 : };
151 :
152 : typedef ::boost::shared_ptr< ::cppcanvas::CanvasGraphic > CanvasGraphicSharedPtr;
153 : }
154 :
155 : #endif /* _CPPCANVAS_CANVASGRAPHIC_HXX */
156 :
157 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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