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/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2012 Adobe Systems Incorporated
* Copyright (C) 2012, 2016 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "ClipStack.h"
#include "GraphicsContext3D.h"
namespace WebCore {
void ClipStack::push()
{
clipStack.append(clipState);
clipStateDirty = true;
}
void ClipStack::pop()
{
if (clipStack.isEmpty())
return;
clipState = clipStack.last();
clipStack.removeLast();
clipStateDirty = true;
}
void ClipStack::reset(const IntRect& rect, ClipStack::YAxisMode mode)
{
clipStack.clear();
size = rect.size();
yAxisMode = mode;
clipState = State(rect);
clipStateDirty = true;
}
void ClipStack::intersect(const IntRect& rect)
{
clipState.scissorBox.intersect(rect);
clipStateDirty = true;
}
void ClipStack::setStencilIndex(int stencilIndex)
{
clipState.stencilIndex = stencilIndex;
clipStateDirty = true;
}
void ClipStack::apply(GraphicsContext3D& context)
{
if (clipState.scissorBox.isEmpty())
return;
context.scissor(clipState.scissorBox.x(),
(yAxisMode == YAxisMode::Inverted) ? size.height() - clipState.scissorBox.maxY() : clipState.scissorBox.y(),
clipState.scissorBox.width(), clipState.scissorBox.height());
context.stencilOp(GraphicsContext3D::KEEP, GraphicsContext3D::KEEP, GraphicsContext3D::KEEP);
context.stencilFunc(GraphicsContext3D::EQUAL, clipState.stencilIndex - 1, clipState.stencilIndex - 1);
if (clipState.stencilIndex == 1)
context.disable(GraphicsContext3D::STENCIL_TEST);
else
context.enable(GraphicsContext3D::STENCIL_TEST);
}
void ClipStack::applyIfNeeded(GraphicsContext3D& context)
{
if (!clipStateDirty)
return;
clipStateDirty = false;
apply(context);
}
} // namespace WebCore
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