1/*
2 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
3 * Copyright (C) 2012 Adobe Systems Incorporated
4 * Copyright (C) 2012, 2016 Igalia S.L.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB. If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22#include "config.h"
23#include "ClipStack.h"
24
25#include "TextureMapperGLHeaders.h"
26
27namespace WebCore {
28
29void ClipStack::push()
30{
31 clipStack.append(clipState);
32 clipStateDirty = true;
33}
34
35void ClipStack::pop()
36{
37 if (clipStack.isEmpty())
38 return;
39 clipState = clipStack.last();
40 clipStack.removeLast();
41 clipStateDirty = true;
42}
43
44void ClipStack::reset(const IntRect& rect, ClipStack::YAxisMode mode)
45{
46 clipStack.clear();
47 size = rect.size();
48 yAxisMode = mode;
49 clipState = State(rect);
50 clipStateDirty = true;
51}
52
53void ClipStack::intersect(const IntRect& rect)
54{
55 clipState.scissorBox.intersect(rect);
56 clipStateDirty = true;
57}
58
59void ClipStack::setStencilIndex(int stencilIndex)
60{
61 clipState.stencilIndex = stencilIndex;
62 clipStateDirty = true;
63}
64
65void ClipStack::apply()
66{
67 if (clipState.scissorBox.isEmpty())
68 return;
69
70 glScissor(clipState.scissorBox.x(),
71 (yAxisMode == YAxisMode::Inverted) ? size.height() - clipState.scissorBox.maxY() : clipState.scissorBox.y(),
72 clipState.scissorBox.width(), clipState.scissorBox.height());
73 glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
74 glStencilFunc(GL_EQUAL, clipState.stencilIndex - 1, clipState.stencilIndex - 1);
75 if (clipState.stencilIndex == 1)
76 glDisable(GL_STENCIL_TEST);
77 else
78 glEnable(GL_STENCIL_TEST);
79}
80
81void ClipStack::applyIfNeeded()
82{
83 if (!clipStateDirty)
84 return;
85
86 clipStateDirty = false;
87 apply();
88}
89
90} // namespace WebCore
91