1 /*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "platform/graphics/DrawLooper.h"
33
34 #include "platform/geometry/FloatSize.h"
35 #include "platform/graphics/Color.h"
36 #include "third_party/skia/include/core/SkColor.h"
37 #include "third_party/skia/include/core/SkColorFilter.h"
38 #include "third_party/skia/include/core/SkDrawLooper.h"
39 #include "third_party/skia/include/core/SkPaint.h"
40 #include "third_party/skia/include/core/SkXfermode.h"
41 #include "third_party/skia/include/effects/SkBlurMaskFilter.h"
42 #include "third_party/skia/include/effects/SkLayerDrawLooper.h"
43
44 namespace WebCore {
45
DrawLooper()46 DrawLooper::DrawLooper() : m_skDrawLooper(adoptRef(new SkLayerDrawLooper)) { }
47
~DrawLooper()48 DrawLooper::~DrawLooper() { }
49
skDrawLooper() const50 SkDrawLooper* DrawLooper::skDrawLooper() const
51 {
52 return m_skDrawLooper.get();
53 }
54
addUnmodifiedContent()55 void DrawLooper::addUnmodifiedContent()
56 {
57 SkLayerDrawLooper::LayerInfo info;
58 m_skDrawLooper->addLayerOnTop(info);
59 }
60
addShadow(const FloatSize & offset,float blur,const Color & color,ShadowTransformMode shadowTransformMode,ShadowAlphaMode shadowAlphaMode)61 void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& color,
62 ShadowTransformMode shadowTransformMode, ShadowAlphaMode shadowAlphaMode)
63 {
64 // Detect when there's no effective shadow.
65 if (!color.isValid() || !color.alpha())
66 return;
67
68 SkColor skColor;
69 if (color.isValid())
70 skColor = color.rgb();
71 else
72 skColor = SkColorSetARGB(0xFF / 3, 0, 0, 0); // "std" apple shadow color.
73
74 SkLayerDrawLooper::LayerInfo info;
75
76 switch (shadowAlphaMode) {
77 case ShadowRespectsAlpha:
78 info.fColorMode = SkXfermode::kDst_Mode;
79 break;
80 case ShadowIgnoresAlpha:
81 info.fColorMode = SkXfermode::kSrc_Mode;
82 break;
83 default:
84 ASSERT_NOT_REACHED();
85 }
86
87 if (blur)
88 info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; // our blur
89 info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
90 info.fOffset.set(offset.width(), offset.height());
91 info.fPostTranslate = (shadowTransformMode == ShadowIgnoresTransforms);
92
93 SkPaint* paint = m_skDrawLooper->addLayerOnTop(info);
94
95 if (blur) {
96 uint32_t mfFlags = SkBlurMaskFilter::kHighQuality_BlurFlag;
97 if (shadowTransformMode == ShadowIgnoresTransforms)
98 mfFlags |= SkBlurMaskFilter::kIgnoreTransform_BlurFlag;
99 RefPtr<SkMaskFilter> mf = adoptRef(SkBlurMaskFilter::Create(
100 (double)blur / 2.0, SkBlurMaskFilter::kNormal_BlurStyle, mfFlags));
101 paint->setMaskFilter(mf.get());
102 }
103
104 RefPtr<SkColorFilter> cf = adoptRef(SkColorFilter::CreateModeFilter(skColor, SkXfermode::kSrcIn_Mode));
105 paint->setColorFilter(cf.get());
106 }
107
108 } // namespace WebCore
109