1 /*
2 * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
3 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
4 * reserved.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB. If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 *
21 */
22
23 #include "third_party/blink/renderer/core/style/shadow_data.h"
24
25 #include "third_party/blink/renderer/platform/animation/animation_utilities.h"
26 #include "third_party/blink/renderer/platform/graphics/color_blend.h"
27 #include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h"
28
29 namespace blink {
30
operator ==(const ShadowData & o) const31 bool ShadowData::operator==(const ShadowData& o) const {
32 return location_ == o.location_ && blur_ == o.blur_ && spread_ == o.spread_ &&
33 style_ == o.style_ && color_ == o.color_;
34 }
35
NeutralValue()36 ShadowData ShadowData::NeutralValue() {
37 return ShadowData(FloatPoint(0, 0), 0, 0, ShadowStyle::kNormal,
38 StyleColor(Color::kTransparent));
39 }
40
RectOutsets() const41 FloatRectOutsets ShadowData::RectOutsets() const {
42 // 3 * sigma is how Skia computes the box blur extent.
43 // See also https://crbug.com/624175.
44 // TODO(fmalita): since the blur extent must reflect rasterization bounds,
45 // its value should be queried from Skia (pending API availability).
46 float blur_and_spread = ceil(3 * BlurRadiusToStdDev(Blur())) + Spread();
47 return FloatRectOutsets(
48 blur_and_spread - Y() /* top */, blur_and_spread + X() /* right */,
49 blur_and_spread + Y() /* bottom */, blur_and_spread - X() /* left */);
50 }
51
52 } // namespace blink
53