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/*
* Copyright (C) 2011 Igalia S.L.
*
* 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"
#include "PlatformContextCairo.h"
#include <cairo.h>
namespace WebCore {
PlatformContextCairo::PlatformContextCairo(cairo_t* cr)
: m_cr(cr)
{
}
void PlatformContextCairo::restore()
{
const ImageMaskInformation& maskInformation = m_maskImageStack.last();
if (maskInformation.isValid()) {
const FloatRect& maskRect = maskInformation.maskRect();
cairo_pop_group_to_source(m_cr.get());
cairo_mask_surface(m_cr.get(), maskInformation.maskSurface(), maskRect.x(), maskRect.y());
}
m_maskImageStack.removeLast();
cairo_restore(m_cr.get());
}
void PlatformContextCairo::save()
{
m_maskImageStack.append(ImageMaskInformation());
cairo_save(m_cr.get());
}
void PlatformContextCairo::pushImageMask(cairo_surface_t* surface, const FloatRect& rect)
{
// We must call savePlatformState at least once before we can use image masking,
// since we actually apply the mask in restorePlatformState.
ASSERT(!m_maskImageStack.isEmpty());
m_maskImageStack.last().update(surface, rect);
// Cairo doesn't support the notion of an image clip, so we push a group here
// and then paint it to the surface with an image mask (which is an immediate
// operation) during restorePlatformState.
// We want to allow the clipped elements to composite with the surface as it
// is now, but they are isolated in another group. To make this work, we're
// going to blit the current surface contents onto the new group once we push it.
cairo_surface_t* currentTarget = cairo_get_target(m_cr.get());
cairo_surface_flush(currentTarget);
// Pushing a new group ensures that only things painted after this point are clipped.
cairo_push_group(m_cr.get());
cairo_set_operator(m_cr.get(), CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface(m_cr.get(), currentTarget, 0, 0);
cairo_rectangle(m_cr.get(), rect.x(), rect.y(), rect.width(), rect.height());
cairo_fill(m_cr.get());
}
} // namespace WebCore
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