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/*
* Copyright (C) 2012 Google Inc. 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 "OpaqueRectTrackingContentLayerDelegate.h"
#include "AffineTransform.h"
#include "FloatRect.h"
#include "GraphicsContext.h"
#include "IntRect.h"
#include "PlatformContextSkia.h"
#include <public/WebFloatRect.h>
#include <public/WebRect.h>
using WebKit::WebFloatRect;
using WebKit::WebRect;
namespace WebCore {
OpaqueRectTrackingContentLayerDelegate::OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter* painter)
: m_painter(painter)
, m_opaque(false)
{
}
OpaqueRectTrackingContentLayerDelegate::~OpaqueRectTrackingContentLayerDelegate()
{
}
void OpaqueRectTrackingContentLayerDelegate::paintContents(SkCanvas* canvas, const WebRect& clip, bool canPaintLCDText, WebFloatRect& opaque)
{
PlatformContextSkia platformContext(canvas);
#if defined(SK_SUPPORT_HINTING_SCALE_FACTOR)
if (canvas)
platformContext.setHintingScaleFactor(canvas->getTotalMatrix().getScaleX());
#endif
platformContext.setTrackOpaqueRegion(!m_opaque);
// FIXME: Rename PlatformContextSkia::setDrawingToImageBuffer to setCanPaintLCDText.
// I also suspect that a function on PlatformContextSkia is not really needed.
// GraphicsContext::setAllowsFontSmoothing can be used for this purpose.
platformContext.setDrawingToImageBuffer(!(canPaintLCDText && m_opaque));
GraphicsContext context(&platformContext);
// Record transform prior to painting, as all opaque tracking will be
// relative to this current value.
AffineTransform canvasToContentTransform = context.getCTM().inverse();
m_painter->paint(context, clip);
// Transform tracked opaque paints back to our layer's content space.
ASSERT(canvasToContentTransform.isInvertible());
ASSERT(canvasToContentTransform.preservesAxisAlignment());
opaque = canvasToContentTransform.mapRect(platformContext.opaqueRegion().asRect());
}
}
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