#include "config.h"
#include "ClipStack.h"
#include "TextureMapperGLHeaders.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()
{
if (clipState.scissorBox.isEmpty())
return;
glScissor(clipState.scissorBox.x(),
(yAxisMode == YAxisMode::Inverted) ? size.height() - clipState.scissorBox.maxY() : clipState.scissorBox.y(),
clipState.scissorBox.width(), clipState.scissorBox.height());
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilFunc(GL_EQUAL, clipState.stencilIndex - 1, clipState.stencilIndex - 1);
if (clipState.stencilIndex == 1)
glDisable(GL_STENCIL_TEST);
else
glEnable(GL_STENCIL_TEST);
}
void ClipStack::applyIfNeeded()
{
if (!clipStateDirty)
return;
clipStateDirty = false;
apply();
}
}