WebCore/platform/graphics/svg/cairo/SVGResourceClipperCairo.cpp

/*
 * Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"

#if ENABLE(SVG)
#include "SVGResourceClipper.h"
#include "AffineTransform.h"
#include "GraphicsContext.h"

#include <cairo.h>

namespace WebCore {

void SVGResourceClipper::applyClip(GraphicsContext* context, const FloatRect& boundingBox) const
{
    Vector<ClipData> data = m_clipData.clipData();
    unsigned int count = data.size();
    if (!count)
        return;

    cairo_t* cr = context->platformContext();
    cairo_reset_clip(cr);

    for (unsigned int x = 0; x < count; x++) {
        Path path = data[x].path;
        if (path.isEmpty())
            continue;
        path.closeSubpath();

        if (data[x].bboxUnits) {
            // Make use of the clipping units
            AffineTransform transform;
            transform.translate(boundingBox.x(), boundingBox.y());
            transform.scale(boundingBox.width(), boundingBox.height());
            path.transform(transform);
        }

        cairo_set_fill_rule(cr, data[x].windRule == RULE_EVENODD ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);

        // TODO: review this code, clipping may not be having the desired effect
        context->clip(path);
    }
}

} // namespace WebCore

#endif