1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 * Copyright (C) 2013 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef HTMLSrcsetParser_h
33#define HTMLSrcsetParser_h
34
35#include <wtf/text/StringView.h>
36
37namespace WebCore {
38
39const int UninitializedDescriptor = -1;
40const float DefaultDensityValue = 1.0;
41
42class DescriptorParsingResult {
43public:
44    DescriptorParsingResult()
45        : m_density(UninitializedDescriptor)
46        , m_resourceWidth(UninitializedDescriptor)
47        , m_resourceHeight(UninitializedDescriptor)
48    {
49    }
50
51    bool hasDensity() const { return m_density >= 0; }
52    bool hasWidth() const { return m_resourceWidth >= 0; }
53    bool hasHeight() const { return m_resourceHeight >= 0; }
54
55    float density() const { ASSERT(hasDensity()); return m_density; }
56    unsigned resourceWidth() const { ASSERT(hasWidth()); return m_resourceWidth; }
57    unsigned resourceHeight() const { ASSERT(hasHeight()); return m_resourceHeight; }
58
59    void setResourceWidth(int width) { ASSERT(width >= 0); m_resourceWidth = (unsigned)width; }
60    void setResourceHeight(int height) { ASSERT(height >= 0); m_resourceHeight = (unsigned)height; }
61    void setDensity(float densityToSet) { ASSERT(densityToSet >= 0); m_density = densityToSet; }
62
63private:
64    float m_density;
65    int m_resourceWidth;
66    int m_resourceHeight;
67};
68
69struct ImageCandidate {
70    enum OriginAttribute {
71        SrcsetOrigin,
72        SrcOrigin
73    };
74
75    ImageCandidate()
76        : density(DefaultDensityValue)
77        , resourceWidth(UninitializedDescriptor)
78        , originAttribute(SrcsetOrigin)
79    {
80    }
81
82    ImageCandidate(const StringView& source, const DescriptorParsingResult& result, OriginAttribute originAttribute)
83        : string(source)
84        , density(result.hasDensity() ? result.density() : UninitializedDescriptor)
85        , resourceWidth(result.hasWidth() ? result.resourceWidth() : UninitializedDescriptor)
86        , originAttribute(originAttribute)
87    {
88    }
89
90    bool srcOrigin() const
91    {
92        return (originAttribute == SrcOrigin);
93    }
94
95    StringView string;
96    float density;
97    int resourceWidth;
98    OriginAttribute originAttribute;
99};
100
101ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, const AtomicString& srcAttribute, const AtomicString& srcsetAttribute
102#if ENABLE(PICTURE_SIZES)
103    , unsigned sourceSize
104#endif
105    );
106
107}
108
109#endif
110