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/*
* Copyright (C) 2010 Sencha, Inc.
* Copyright (C) 2010 Igalia S.L.
*
* All rights reserved.
*
* 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 "ContextShadow.h"
#include "CairoUtilities.h"
#include "Timer.h"
#include <cairo.h>
namespace WebCore {
static cairo_surface_t* scratchBuffer = 0;
static void purgeScratchBuffer()
{
cairo_surface_destroy(scratchBuffer);
scratchBuffer = 0;
}
// ContextShadow needs a scratch image as the buffer for the blur filter.
// Instead of creating and destroying the buffer for every operation,
// we create a buffer which will be automatically purged via a timer.
class PurgeScratchBufferTimer : public TimerBase {
private:
virtual void fired() { purgeScratchBuffer(); }
};
static PurgeScratchBufferTimer purgeScratchBufferTimer;
static void scheduleScratchBufferPurge()
{
if (purgeScratchBufferTimer.isActive())
purgeScratchBufferTimer.stop();
purgeScratchBufferTimer.startOneShot(2);
}
static cairo_surface_t* getScratchBuffer(const IntSize& size)
{
int width = size.width();
int height = size.height();
int scratchWidth = scratchBuffer ? cairo_image_surface_get_width(scratchBuffer) : 0;
int scratchHeight = scratchBuffer ? cairo_image_surface_get_height(scratchBuffer) : 0;
// We do not need to recreate the buffer if the current buffer is large enough.
if (scratchBuffer && scratchWidth >= width && scratchHeight >= height)
return scratchBuffer;
purgeScratchBuffer();
// Round to the nearest 32 pixels so we do not grow the buffer for similar sized requests.
width = (1 + (width >> 5)) << 5;
height = (1 + (height >> 5)) << 5;
scratchBuffer = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
return scratchBuffer;
}
PlatformContext ContextShadow::beginShadowLayer(PlatformContext context, const FloatRect& layerArea)
{
double x1, x2, y1, y2;
cairo_clip_extents(context, &x1, &y1, &x2, &y2);
calculateLayerBoundingRect(layerArea, IntRect(x1, y1, x2 - x1, y2 - y1));
// Don't paint if we are totally outside the clip region.
if (m_layerRect.isEmpty())
return 0;
m_layerImage = getScratchBuffer(m_layerRect.size());
m_layerContext = cairo_create(m_layerImage);
// Always clear the surface first.
cairo_set_operator(m_layerContext, CAIRO_OPERATOR_CLEAR);
cairo_paint(m_layerContext);
cairo_set_operator(m_layerContext, CAIRO_OPERATOR_OVER);
cairo_translate(m_layerContext, m_offset.width(), m_offset.height());
cairo_translate(m_layerContext, -m_layerRect.x(), -m_layerRect.y());
return m_layerContext;
}
void ContextShadow::endShadowLayer(cairo_t* cr)
{
cairo_destroy(m_layerContext);
m_layerContext = 0;
if (m_type == BlurShadow)
blurLayerImage(cairo_image_surface_get_data(m_layerImage),
IntSize(cairo_image_surface_get_width(m_layerImage), cairo_image_surface_get_height(m_layerImage)),
cairo_image_surface_get_stride(m_layerImage));
cairo_save(cr);
setSourceRGBAFromColor(cr, m_color);
cairo_mask_surface(cr, m_layerImage, m_layerRect.x(), m_layerRect.y());
cairo_restore(cr);
// Schedule a purge of the scratch buffer. We do not need to destroy the surface.
scheduleScratchBufferPurge();
}
}
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