mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
/*
|
|
* 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 "flutter/sky/engine/platform/graphics/DrawLooperBuilder.h"
|
|
|
|
#include "flutter/sky/engine/platform/geometry/FloatSize.h"
|
|
#include "flutter/sky/engine/platform/graphics/Color.h"
|
|
#include "flutter/sky/engine/platform/graphics/skia/SkiaUtils.h"
|
|
#include "flutter/sky/engine/wtf/RefPtr.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/SkMaskFilter.h"
|
|
#include "third_party/skia/include/core/SkPaint.h"
|
|
|
|
namespace blink {
|
|
|
|
DrawLooperBuilder::DrawLooperBuilder() {}
|
|
|
|
DrawLooperBuilder::~DrawLooperBuilder() {}
|
|
|
|
PassOwnPtr<DrawLooperBuilder> DrawLooperBuilder::create() {
|
|
return adoptPtr(new DrawLooperBuilder);
|
|
}
|
|
|
|
sk_sp<SkDrawLooper> DrawLooperBuilder::detachDrawLooper() {
|
|
return m_skDrawLooperBuilder.detach();
|
|
}
|
|
|
|
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 = SkBlendMode::kDst;
|
|
break;
|
|
case ShadowIgnoresAlpha:
|
|
info.fColorMode = SkBlendMode::kSrc;
|
|
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);
|
|
bool respectCTM = (shadowTransformMode != ShadowIgnoresTransforms);
|
|
paint->setMaskFilter(
|
|
SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, sigma, respectCTM));
|
|
}
|
|
|
|
paint->setColorFilter(
|
|
SkColorFilter::MakeModeFilter(skColor, SkBlendMode::kSrcIn));
|
|
}
|
|
|
|
} // namespace blink
|