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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
* Copyright (C) 2013 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_AREA_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_AREA_H_
#include "third_party/blink/renderer/core/style/grid_positions_resolver.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
// Recommended maximum size for both explicit and implicit grids. Note that this
// actually allows a [-999,999] range. The limit is low on purpouse because
// higher values easly trigger OOM situations. That will definitely improve once
// we switch from a vector of vectors based grid representation to a more
// efficient one memory-wise.
const int kGridMaxTracks = 1000;
// A span in a single direction (either rows or columns). Note that |start_line|
// and |end_line| are grid lines' indexes.
// Despite line numbers in the spec start in "1", the indexes here start in "0".
struct GridSpan {
USING_FAST_MALLOC(GridSpan);
public:
static GridSpan UntranslatedDefiniteGridSpan(int start_line, int end_line) {
return GridSpan(start_line, end_line, kUntranslatedDefinite);
}
static GridSpan TranslatedDefiniteGridSpan(size_t start_line,
size_t end_line) {
return GridSpan(start_line, end_line, kTranslatedDefinite);
}
static GridSpan IndefiniteGridSpan() { return GridSpan(0, 1, kIndefinite); }
bool operator==(const GridSpan& o) const {
return type_ == o.type_ && start_line_ == o.start_line_ &&
end_line_ == o.end_line_;
}
bool operator<(const GridSpan& o) const {
DCHECK(IsTranslatedDefinite());
return start_line_ < o.start_line_ ||
(start_line_ == o.start_line_ && end_line_ < o.end_line_);
}
bool operator<=(const GridSpan& o) const {
DCHECK(IsTranslatedDefinite());
return *this < o || *this == o;
}
size_t IntegerSpan() const {
DCHECK(IsTranslatedDefinite());
DCHECK_GT(end_line_, start_line_);
return end_line_ - start_line_;
}
int UntranslatedStartLine() const {
DCHECK_EQ(type_, kUntranslatedDefinite);
return start_line_;
}
int UntranslatedEndLine() const {
DCHECK_EQ(type_, kUntranslatedDefinite);
return end_line_;
}
size_t StartLine() const {
DCHECK(IsTranslatedDefinite());
DCHECK_GE(start_line_, 0);
return start_line_;
}
size_t EndLine() const {
DCHECK(IsTranslatedDefinite());
DCHECK_GT(end_line_, 0);
return end_line_;
}
struct GridSpanIterator {
GridSpanIterator(size_t v) : value(v) {}
size_t operator*() const { return value; }
size_t operator++() { return value++; }
bool operator!=(GridSpanIterator other) const {
return value != other.value;
}
size_t value;
};
GridSpanIterator begin() const {
DCHECK(IsTranslatedDefinite());
return start_line_;
}
GridSpanIterator end() const {
DCHECK(IsTranslatedDefinite());
return end_line_;
}
bool IsUntranslatedDefinite() const { return type_ == kUntranslatedDefinite; }
bool IsTranslatedDefinite() const { return type_ == kTranslatedDefinite; }
bool IsIndefinite() const { return type_ == kIndefinite; }
void Translate(size_t offset) {
DCHECK_EQ(type_, kUntranslatedDefinite);
type_ = kTranslatedDefinite;
start_line_ += offset;
end_line_ += offset;
DCHECK_GE(start_line_, 0);
DCHECK_GT(end_line_, 0);
}
private:
enum GridSpanType { kUntranslatedDefinite, kTranslatedDefinite, kIndefinite };
template <typename T>
GridSpan(T start_line, T end_line, GridSpanType type) : type_(type) {
#if DCHECK_IS_ON()
DCHECK_LT(start_line, end_line);
if (type == kTranslatedDefinite) {
DCHECK_GE(start_line, static_cast<T>(0));
DCHECK_GT(end_line, static_cast<T>(0));
}
#endif
start_line_ = clampTo<int>(start_line, -kGridMaxTracks, kGridMaxTracks - 1);
end_line_ = clampTo<int>(end_line, -kGridMaxTracks + 1, kGridMaxTracks);
}
int start_line_;
int end_line_;
GridSpanType type_;
};
// This represents a grid area that spans in both rows' and columns' direction.
struct GridArea {
USING_FAST_MALLOC(GridArea);
public:
// HashMap requires a default constuctor.
GridArea()
: columns(GridSpan::IndefiniteGridSpan()),
rows(GridSpan::IndefiniteGridSpan()) {}
GridArea(const GridSpan& r, const GridSpan& c) : columns(c), rows(r) {}
bool operator==(const GridArea& o) const {
return columns == o.columns && rows == o.rows;
}
bool operator!=(const GridArea& o) const { return !(*this == o); }
GridSpan columns;
GridSpan rows;
};
typedef HashMap<String, GridArea> NamedGridAreaMap;
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_AREA_H_
|
