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/*
* Copyright (C) 2013 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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 "platform/graphics/DrawLooperBuilder.h"
#include "platform/geometry/FloatSize.h"
#include "platform/graphics/Color.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/core/SkDrawLooper.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkXfermode.h"
#include "third_party/skia/include/effects/SkBlurMaskFilter.h"
#include "wtf/RefPtr.h"
namespace blink {
DrawLooperBuilder::DrawLooperBuilder() { }
DrawLooperBuilder::~DrawLooperBuilder() { }
PassOwnPtr<DrawLooperBuilder> DrawLooperBuilder::create()
{
return adoptPtr(new DrawLooperBuilder);
}
PassRefPtr<SkDrawLooper> DrawLooperBuilder::detachDrawLooper()
{
return adoptRef(m_skDrawLooperBuilder.detachLooper());
}
void DrawLooperBuilder::addUnmodifiedContent()
{
SkLayerDrawLooper::LayerInfo info;
m_skDrawLooperBuilder.addLayerOnTop(info);
}
// This replicates the old skia behavior when it used to take radius for blur. Now it takes sigma.
static SkScalar RadiusToSigma(SkScalar radius)
{
SkASSERT(radius > 0);
return 0.57735f * radius + 0.5f;
}
void DrawLooperBuilder::addShadow(const FloatSize& offset, float blur, const Color& color,
ShadowTransformMode shadowTransformMode, ShadowAlphaMode shadowAlphaMode)
{
// Detect when there's no effective shadow.
if (!color.alpha())
return;
SkColor skColor = color.rgb();
SkLayerDrawLooper::LayerInfo info;
switch (shadowAlphaMode) {
case ShadowRespectsAlpha:
info.fColorMode = SkXfermode::kDst_Mode;
break;
case ShadowIgnoresAlpha:
info.fColorMode = SkXfermode::kSrc_Mode;
break;
default:
ASSERT_NOT_REACHED();
}
if (blur)
info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; // our blur
info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
info.fOffset.set(offset.width(), offset.height());
info.fPostTranslate = (shadowTransformMode == ShadowIgnoresTransforms);
SkPaint* paint = m_skDrawLooperBuilder.addLayerOnTop(info);
if (blur) {
const SkScalar sigma = RadiusToSigma(blur / 2);
uint32_t mfFlags = SkBlurMaskFilter::kHighQuality_BlurFlag;
if (shadowTransformMode == ShadowIgnoresTransforms)
mfFlags |= SkBlurMaskFilter::kIgnoreTransform_BlurFlag;
RefPtr<SkMaskFilter> mf = adoptRef(SkBlurMaskFilter::Create(kNormal_SkBlurStyle, sigma, mfFlags));
paint->setMaskFilter(mf.get());
}
RefPtr<SkColorFilter> cf = adoptRef(SkColorFilter::CreateModeFilter(skColor, SkXfermode::kSrcIn_Mode));
paint->setColorFilter(cf.get());
}
} // namespace blink
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