1/*
2 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
3 * Copyright (C) 2015, 2016 Igalia S.L.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21#ifndef ClipStack_h
22#define ClipStack_h
23
24#include "IntRect.h"
25#include "IntSize.h"
26#include <wtf/Vector.h>
27
28namespace WebCore {
29
30class ClipStack {
31public:
32 struct State {
33 State(const IntRect& scissors = IntRect(), int stencil = 1)
34 : scissorBox(scissors)
35 , stencilIndex(stencil)
36 { }
37
38 IntRect scissorBox;
39 int stencilIndex;
40 };
41
42 // Y-axis should be inverted only when painting into the window.
43 enum class YAxisMode {
44 Default,
45 Inverted,
46 };
47
48 void push();
49 void pop();
50 State& current() { return clipState; }
51
52 void reset(const IntRect&, YAxisMode);
53 void intersect(const IntRect&);
54 void setStencilIndex(int);
55 int getStencilIndex() const { return clipState.stencilIndex; }
56
57 void apply();
58 void applyIfNeeded();
59
60 bool isCurrentScissorBoxEmpty() const { return clipState.scissorBox.isEmpty(); }
61
62private:
63 Vector<State> clipStack;
64 State clipState;
65 IntSize size;
66 bool clipStateDirty { false };
67 YAxisMode yAxisMode { YAxisMode::Default };
68};
69
70} // namespace WebCore
71
72#endif // ClipStack_h
73