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
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "Minikin"
#include "minikin/Layout.h"
#include <cmath>
#include <iostream>
#include <mutex>
#include <string>
#include <vector>
#include <hb-icu.h>
#include <hb-ot.h>
#include <log/log.h>
#include <unicode/ubidi.h>
#include <unicode/utf16.h>
#include <utils/LruCache.h>
#include "minikin/Emoji.h"
#include "minikin/HbUtils.h"
#include "minikin/LayoutCache.h"
#include "minikin/LayoutPieces.h"
#include "minikin/Macros.h"
#include "BidiUtils.h"
#include "LayoutSplitter.h"
#include "LayoutUtils.h"
#include "LocaleListCache.h"
#include "MinikinInternal.h"
namespace minikin {
void Layout::doLayout(const U16StringPiece& textBuf, const Range& range, Bidi bidiFlags,
const MinikinPaint& paint, StartHyphenEdit startHyphen,
EndHyphenEdit endHyphen) {
const uint32_t count = range.getLength();
mAdvances.resize(count, 0);
mGlyphs.reserve(count);
for (const BidiText::RunInfo& runInfo : BidiText(textBuf, range, bidiFlags)) {
doLayoutRunCached(textBuf, runInfo.range, runInfo.isRtl, paint, range.getStart(),
startHyphen, endHyphen, this, nullptr);
}
}
float Layout::measureText(const U16StringPiece& textBuf, const Range& range, Bidi bidiFlags,
const MinikinPaint& paint, StartHyphenEdit startHyphen,
EndHyphenEdit endHyphen, float* advances) {
float advance = 0;
for (const BidiText::RunInfo& runInfo : BidiText(textBuf, range, bidiFlags)) {
const size_t offset = range.toRangeOffset(runInfo.range.getStart());
float* advancesForRun = advances ? advances + offset : nullptr;
advance += doLayoutRunCached(textBuf, runInfo.range, runInfo.isRtl, paint, 0, startHyphen,
endHyphen, nullptr, advancesForRun);
}
return advance;
}
float Layout::doLayoutRunCached(const U16StringPiece& textBuf, const Range& range, bool isRtl,
const MinikinPaint& paint, size_t dstStart,
StartHyphenEdit startHyphen, EndHyphenEdit endHyphen,
Layout* layout, float* advances) {
if (!range.isValid()) {
return 0.0f; // ICU failed to retrieve the bidi run?
}
float advance = 0;
for (const auto[context, piece] : LayoutSplitter(textBuf, range, isRtl)) {
// Hyphenation only applies to the start/end of run.
const StartHyphenEdit pieceStartHyphen =
(piece.getStart() == range.getStart()) ? startHyphen : StartHyphenEdit::NO_EDIT;
const EndHyphenEdit pieceEndHyphen =
(piece.getEnd() == range.getEnd()) ? endHyphen : EndHyphenEdit::NO_EDIT;
float* advancesForRun =
advances ? advances + (piece.getStart() - range.getStart()) : nullptr;
advance += doLayoutWord(textBuf.data() + context.getStart(),
piece.getStart() - context.getStart(), piece.getLength(),
context.getLength(), isRtl, paint, piece.getStart() - dstStart,
pieceStartHyphen, pieceEndHyphen, layout, advancesForRun);
}
return advance;
}
class LayoutAppendFunctor {
public:
LayoutAppendFunctor(Layout* layout, float* advances, float* totalAdvance, uint32_t outOffset,
float wordSpacing)
: mLayout(layout),
mAdvances(advances),
mTotalAdvance(totalAdvance),
mOutOffset(outOffset),
mWordSpacing(wordSpacing) {}
void operator()(const LayoutPiece& layoutPiece, const MinikinPaint& /* paint */) {
if (mLayout) {
mLayout->appendLayout(layoutPiece, mOutOffset, mWordSpacing);
}
if (mAdvances) {
const std::vector<float>& advances = layoutPiece.advances();
std::copy(advances.begin(), advances.end(), mAdvances);
}
if (mTotalAdvance) {
*mTotalAdvance = layoutPiece.advance();
}
}
private:
Layout* mLayout;
float* mAdvances;
float* mTotalAdvance;
const uint32_t mOutOffset;
const float mWordSpacing;
};
float Layout::doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
bool isRtl, const MinikinPaint& paint, size_t bufStart,
StartHyphenEdit startHyphen, EndHyphenEdit endHyphen, Layout* layout,
float* advances) {
float wordSpacing = count == 1 && isWordSpace(buf[start]) ? paint.wordSpacing : 0;
float totalAdvance = 0;
const U16StringPiece textBuf(buf, bufSize);
const Range range(start, start + count);
LayoutAppendFunctor f(layout, advances, &totalAdvance, bufStart, wordSpacing);
LayoutCache::getInstance().getOrCreate(textBuf, range, paint, isRtl, startHyphen, endHyphen, f);
if (wordSpacing != 0) {
totalAdvance += wordSpacing;
if (advances) {
advances[0] += wordSpacing;
}
}
return totalAdvance;
}
void Layout::appendLayout(const LayoutPiece& src, size_t start, float extraAdvance) {
for (size_t i = 0; i < src.glyphCount(); i++) {
mGlyphs.emplace_back(src.fontAt(i), src.glyphIdAt(i), mAdvance + src.pointAt(i).x,
src.pointAt(i).y);
}
const std::vector<float>& advances = src.advances();
for (size_t i = 0; i < advances.size(); i++) {
mAdvances[i + start] = advances[i];
if (i == 0) {
mAdvances[start] += extraAdvance;
}
}
mAdvance += src.advance() + extraAdvance;
}
void Layout::purgeCaches() {
LayoutCache::getInstance().clear();
}
} // namespace minikin
|
