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#ifndef DrawLooperBuilder_h
32#define DrawLooperBuilder_h
33
34#include "platform/PlatformExport.h"
35#include "third_party/skia/include/effects/SkLayerDrawLooper.h"
36#include "wtf/Noncopyable.h"
37#include "wtf/PassOwnPtr.h"
38#include "wtf/PassRefPtr.h"
39
40class SkDrawLooper;
41
42namespace blink {
43
44class Color;
45class FloatSize;
46
47class PLATFORM_EXPORT DrawLooperBuilder FINAL {
48    // Implementing the copy constructor properly would require writing code to
49    // copy the underlying SkLayerDrawLooper::Builder.
50    WTF_MAKE_NONCOPYABLE(DrawLooperBuilder);
51
52public:
53    enum ShadowTransformMode {
54        ShadowRespectsTransforms,
55        ShadowIgnoresTransforms
56    };
57    enum ShadowAlphaMode {
58        ShadowRespectsAlpha,
59        ShadowIgnoresAlpha
60    };
61
62    DrawLooperBuilder();
63    ~DrawLooperBuilder();
64
65    static PassOwnPtr<DrawLooperBuilder> create();
66
67    // Creates the SkDrawLooper and passes ownership to the caller. The builder
68    // should not be used any more after calling this method.
69    PassRefPtr<SkDrawLooper> detachDrawLooper();
70
71    void addUnmodifiedContent();
72    void addShadow(const FloatSize& offset, float blur, const Color&,
73        ShadowTransformMode = ShadowRespectsTransforms,
74        ShadowAlphaMode = ShadowRespectsAlpha);
75
76private:
77    SkLayerDrawLooper::Builder m_skDrawLooperBuilder;
78};
79
80} // namespace blink
81
82#endif // DrawLooperBuilder_h
83