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115 lines
4.2 KiB
C++
115 lines
4.2 KiB
C++
/*
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* Copyright (C) 2013 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "flutter/sky/engine/platform/graphics/DrawLooperBuilder.h"
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#include "flutter/sky/engine/platform/geometry/FloatSize.h"
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#include "flutter/sky/engine/platform/graphics/Color.h"
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#include "flutter/sky/engine/platform/graphics/skia/SkiaUtils.h"
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#include "flutter/sky/engine/wtf/RefPtr.h"
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#include "third_party/skia/include/core/SkColor.h"
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#include "third_party/skia/include/core/SkColorFilter.h"
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#include "third_party/skia/include/core/SkDrawLooper.h"
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#include "third_party/skia/include/core/SkPaint.h"
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#include "third_party/skia/include/core/SkXfermode.h"
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#include "third_party/skia/include/effects/SkBlurMaskFilter.h"
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namespace blink {
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DrawLooperBuilder::DrawLooperBuilder() { }
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DrawLooperBuilder::~DrawLooperBuilder() { }
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PassOwnPtr<DrawLooperBuilder> DrawLooperBuilder::create()
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{
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return adoptPtr(new DrawLooperBuilder);
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}
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sk_sp<SkDrawLooper> DrawLooperBuilder::detachDrawLooper()
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{
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return m_skDrawLooperBuilder.detach();
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}
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void DrawLooperBuilder::addUnmodifiedContent()
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{
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SkLayerDrawLooper::LayerInfo info;
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m_skDrawLooperBuilder.addLayerOnTop(info);
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}
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// This replicates the old skia behavior when it used to take radius for blur. Now it takes sigma.
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static SkScalar RadiusToSigma(SkScalar radius)
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{
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SkASSERT(radius > 0);
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return 0.57735f * radius + 0.5f;
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}
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void DrawLooperBuilder::addShadow(const FloatSize& offset, float blur, const Color& color,
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ShadowTransformMode shadowTransformMode, ShadowAlphaMode shadowAlphaMode)
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{
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// Detect when there's no effective shadow.
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if (!color.alpha())
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return;
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SkColor skColor = color.rgb();
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SkLayerDrawLooper::LayerInfo info;
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switch (shadowAlphaMode) {
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case ShadowRespectsAlpha:
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info.fColorMode = SkXfermode::kDst_Mode;
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break;
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case ShadowIgnoresAlpha:
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info.fColorMode = SkXfermode::kSrc_Mode;
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break;
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default:
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ASSERT_NOT_REACHED();
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}
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if (blur)
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info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; // our blur
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info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
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info.fOffset.set(offset.width(), offset.height());
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info.fPostTranslate = (shadowTransformMode == ShadowIgnoresTransforms);
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SkPaint* paint = m_skDrawLooperBuilder.addLayerOnTop(info);
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if (blur) {
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const SkScalar sigma = RadiusToSigma(blur / 2);
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uint32_t mfFlags = SkBlurMaskFilter::kHighQuality_BlurFlag;
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if (shadowTransformMode == ShadowIgnoresTransforms)
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mfFlags |= SkBlurMaskFilter::kIgnoreTransform_BlurFlag;
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paint->setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, sigma, mfFlags));
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}
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paint->setColorFilter(SkColorFilter::MakeModeFilter(skColor, SkXfermode::kSrcIn_Mode));
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}
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} // namespace blink
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