1 /*

     2  * Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #include "config.h"

    27 

    28 #if ENABLE(SVG)

    29 #include "SVGResourceClipper.h"

    30 #include "AffineTransform.h"

    31 #include "GraphicsContext.h"

    32 

    33 #include <cairo.h>

    34 

    35 namespace WebCore {

    36 

    37 void SVGResourceClipper::applyClip(GraphicsContext* context, const FloatRect& boundingBox) const

    38 {

    39     Vector<ClipData> data = m_clipData.clipData();

    40     unsigned int count = data.size();

    41     if (!count)

    42         return;

    43 

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

    45     cairo_reset_clip(cr);

    46 

    47     for (unsigned int x = 0; x < count; x++) {

    48         Path path = data[x].path;

    49         if (path.isEmpty())

    50             continue;

    51         path.closeSubpath();

    52 

    53         if (data[x].bboxUnits) {

    54             // Make use of the clipping units

    55             AffineTransform transform;

    56             transform.translate(boundingBox.x(), boundingBox.y());

    57             transform.scale(boundingBox.width(), boundingBox.height());

    58             path.transform(transform);

    59         }

    60 

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

    62 

    63         // TODO: review this code, clipping may not be having the desired effect

    64         context->clip(path);

    65     }

    66 }

    67 

    68 } // namespace WebCore

    69 

    70 #endif