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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 "core/platform/graphics/DrawLooper.h" | |
33 | |
34 #include "core/platform/graphics/Color.h" | |
35 #include "platform/geometry/FloatSize.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 | |
46 DrawLooper::DrawLooper() : m_skDrawLooper(adoptRef(new SkLayerDrawLooper)) { } | |
47 | |
48 DrawLooper::~DrawLooper() { } | |
49 | |
50 SkDrawLooper* DrawLooper::skDrawLooper() const | |
51 { | |
52 return m_skDrawLooper.get(); | |
53 } | |
54 | |
55 void DrawLooper::addUnmodifiedContent() | |
56 { | |
57 SkLayerDrawLooper::LayerInfo info; | |
58 m_skDrawLooper->addLayerOnTop(info); | |
59 } | |
60 | |
61 void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& col
or, | |
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 | |
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