1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2012-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "AffineTransform.h"
#include "FloatSize.h"
#include <stdint.h>
// X11 headers define a bunch of macros with common terms, interfering with WebCore and WTF enum values.
// As a workaround, we explicitly undef them here.
#if defined(None)
#undef None
#endif
namespace WebCore {
struct ImageOrientation {
enum class Orientation : uint8_t {
FromImage = 0, // Orientation from the image should be respected.
// This range intentionally matches the orientation values from the EXIF spec.
// See JEITA CP-3451, page 18. http://www.exif.org/Exif2-2.PDF
OriginTopLeft = 1, // default
OriginTopRight = 2, // mirror along y-axis
OriginBottomRight = 3, // 180 degree rotation
OriginBottomLeft = 4, // mirror along the x-axis
OriginLeftTop = 5, // mirror along x-axis + 270 degree CW rotation
OriginRightTop = 6, // 90 degree CW rotation
OriginRightBottom = 7, // mirror along x-axis + 90 degree CW rotation
OriginLeftBottom = 8, // 270 degree CW rotation
None = OriginTopLeft
};
constexpr ImageOrientation() = default;
constexpr ImageOrientation(Orientation orientation)
: m_orientation(orientation)
{
}
ImageOrientation(int orientation)
{
RELEASE_ASSERT(isValidOrientation(orientation));
m_orientation = static_cast<Orientation>(orientation);
}
static constexpr Orientation fromEXIFValue(int exifValue)
{
return isValidEXIFOrientation(exifValue) ? static_cast<Orientation>(exifValue) : Orientation::None;
}
constexpr operator int() const { return static_cast<int>(m_orientation); }
friend constexpr bool operator==(const ImageOrientation&, const ImageOrientation&) = default;
constexpr Orientation orientation() const { return m_orientation; }
constexpr bool usesWidthAsHeight() const
{
ASSERT(m_orientation != Orientation::FromImage);
// Values 5 through 8 all flip the width/height.
switch (m_orientation) {
case Orientation::OriginLeftTop:
case Orientation::OriginRightTop:
case Orientation::OriginRightBottom:
case Orientation::OriginLeftBottom:
return true;
default:
return false;
}
}
constexpr AffineTransform transformFromDefault(const FloatSize& drawnSize) const
{
float w = drawnSize.width();
float h = drawnSize.height();
switch (m_orientation) {
case Orientation::FromImage:
ASSERT_NOT_REACHED();
return AffineTransform();
case Orientation::OriginTopLeft:
return AffineTransform();
case Orientation::OriginTopRight:
return AffineTransform(-1, 0, 0, 1, w, 0);
case Orientation::OriginBottomRight:
return AffineTransform(-1, 0, 0, -1, w, h);
case Orientation::OriginBottomLeft:
return AffineTransform( 1, 0, 0, -1, 0, h);
case Orientation::OriginLeftTop:
return AffineTransform( 0, 1, 1, 0, 0, 0);
case Orientation::OriginRightTop:
return AffineTransform( 0, 1, -1, 0, w, 0);
case Orientation::OriginRightBottom:
return AffineTransform( 0, -1, -1, 0, w, h);
case Orientation::OriginLeftBottom:
return AffineTransform( 0, -1, 1, 0, 0, h);
}
ASSERT_NOT_REACHED();
return AffineTransform();
}
constexpr ImageOrientation withFlippedY() const
{
ASSERT(m_orientation != Orientation::FromImage);
switch (m_orientation) {
case Orientation::FromImage:
ASSERT_NOT_REACHED();
return Orientation::None;
case Orientation::OriginTopLeft:
return Orientation::OriginBottomLeft;
case Orientation::OriginTopRight:
return Orientation::OriginBottomRight;
case Orientation::OriginBottomRight:
return Orientation::OriginTopRight;
case Orientation::OriginBottomLeft:
return Orientation::OriginTopLeft;
case Orientation::OriginLeftTop:
return Orientation::OriginLeftBottom;
case Orientation::OriginRightTop:
return Orientation::OriginRightBottom;
case Orientation::OriginRightBottom:
return Orientation::OriginRightTop;
case Orientation::OriginLeftBottom:
return Orientation::OriginLeftTop;
}
ASSERT_NOT_REACHED();
return Orientation::None;
}
private:
static constexpr auto EXIFFirst = Orientation::OriginTopLeft;
static constexpr auto EXIFLast = Orientation::OriginLeftBottom;
static constexpr auto First = Orientation::FromImage;
static constexpr auto Last = EXIFLast;
static constexpr bool isValidOrientation(int orientation)
{
return orientation >= static_cast<int>(First) && orientation <= static_cast<int>(Last);
}
static constexpr bool isValidEXIFOrientation(int orientation)
{
return orientation >= static_cast<int>(EXIFFirst) && orientation <= static_cast<int>(EXIFLast);
}
Orientation m_orientation { Orientation::None };
};
TextStream& operator<<(TextStream&, ImageOrientation::Orientation);
} // namespace WebCore
|
