1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "MinikinUtils.h"
18
19 #include <string>
20
21 #include <log/log.h>
22
23 #include <minikin/MeasuredText.h>
24 #include "Paint.h"
25 #include "SkPathMeasure.h"
26 #include "Typeface.h"
27
28 namespace android {
29
prepareMinikinPaint(const Paint * paint,const Typeface * typeface)30 minikin::MinikinPaint MinikinUtils::prepareMinikinPaint(const Paint* paint,
31 const Typeface* typeface) {
32 const Typeface* resolvedFace = Typeface::resolveDefault(typeface);
33 const SkFont& font = paint->getSkFont();
34
35 minikin::MinikinPaint minikinPaint(resolvedFace->fFontCollection);
36 /* Prepare minikin Paint */
37 minikinPaint.size =
38 font.isLinearMetrics() ? font.getSize() : static_cast<int>(font.getSize());
39 minikinPaint.scaleX = font.getScaleX();
40 minikinPaint.skewX = font.getSkewX();
41 minikinPaint.letterSpacing = paint->getLetterSpacing();
42 minikinPaint.wordSpacing = paint->getWordSpacing();
43 minikinPaint.fontFlags = MinikinFontSkia::packFontFlags(font);
44 minikinPaint.localeListId = paint->getMinikinLocaleListId();
45 minikinPaint.familyVariant = paint->getFamilyVariant();
46 minikinPaint.fontStyle = resolvedFace->fStyle;
47 minikinPaint.fontFeatureSettings = paint->getFontFeatureSettings();
48 return minikinPaint;
49 }
50
doLayout(const Paint * paint,minikin::Bidi bidiFlags,const Typeface * typeface,const uint16_t * buf,size_t bufSize,size_t start,size_t count,size_t contextStart,size_t contextCount,minikin::MeasuredText * mt)51 minikin::Layout MinikinUtils::doLayout(const Paint* paint, minikin::Bidi bidiFlags,
52 const Typeface* typeface, const uint16_t* buf,
53 size_t bufSize, size_t start, size_t count,
54 size_t contextStart, size_t contextCount,
55 minikin::MeasuredText* mt) {
56 minikin::MinikinPaint minikinPaint = prepareMinikinPaint(paint, typeface);
57
58 const minikin::U16StringPiece textBuf(buf, bufSize);
59 const minikin::Range range(start, start + count);
60 const minikin::Range contextRange(contextStart, contextStart + contextCount);
61 const minikin::StartHyphenEdit startHyphen = paint->getStartHyphenEdit();
62 const minikin::EndHyphenEdit endHyphen = paint->getEndHyphenEdit();
63
64 if (mt == nullptr) {
65 return minikin::Layout(textBuf.substr(contextRange), range - contextStart, bidiFlags,
66 minikinPaint, startHyphen, endHyphen);
67 } else {
68 return mt->buildLayout(textBuf, range, contextRange, minikinPaint, startHyphen, endHyphen);
69 }
70 }
71
measureText(const Paint * paint,minikin::Bidi bidiFlags,const Typeface * typeface,const uint16_t * buf,size_t start,size_t count,size_t bufSize,float * advances)72 float MinikinUtils::measureText(const Paint* paint, minikin::Bidi bidiFlags,
73 const Typeface* typeface, const uint16_t* buf, size_t start,
74 size_t count, size_t bufSize, float* advances) {
75 minikin::MinikinPaint minikinPaint = prepareMinikinPaint(paint, typeface);
76 const minikin::U16StringPiece textBuf(buf, bufSize);
77 const minikin::Range range(start, start + count);
78 const minikin::StartHyphenEdit startHyphen = paint->getStartHyphenEdit();
79 const minikin::EndHyphenEdit endHyphen = paint->getEndHyphenEdit();
80
81 return minikin::Layout::measureText(textBuf, range, bidiFlags, minikinPaint, startHyphen,
82 endHyphen, advances);
83 }
84
hasVariationSelector(const Typeface * typeface,uint32_t codepoint,uint32_t vs)85 bool MinikinUtils::hasVariationSelector(const Typeface* typeface, uint32_t codepoint, uint32_t vs) {
86 const Typeface* resolvedFace = Typeface::resolveDefault(typeface);
87 return resolvedFace->fFontCollection->hasVariationSelector(codepoint, vs);
88 }
89
xOffsetForTextAlign(Paint * paint,const minikin::Layout & layout)90 float MinikinUtils::xOffsetForTextAlign(Paint* paint, const minikin::Layout& layout) {
91 switch (paint->getTextAlign()) {
92 case Paint::kCenter_Align:
93 return layout.getAdvance() * -0.5f;
94 break;
95 case Paint::kRight_Align:
96 return -layout.getAdvance();
97 break;
98 default:
99 break;
100 }
101 return 0;
102 }
103
hOffsetForTextAlign(Paint * paint,const minikin::Layout & layout,const SkPath & path)104 float MinikinUtils::hOffsetForTextAlign(Paint* paint, const minikin::Layout& layout,
105 const SkPath& path) {
106 float align = 0;
107 switch (paint->getTextAlign()) {
108 case Paint::kCenter_Align:
109 align = -0.5f;
110 break;
111 case Paint::kRight_Align:
112 align = -1;
113 break;
114 default:
115 return 0;
116 }
117 SkPathMeasure measure(path, false);
118 return align * (layout.getAdvance() - measure.getLength());
119 }
120 } // namespace android
121