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
28namespace android {
29
30minikin::MinikinPaint MinikinUtils::prepareMinikinPaint(const Paint* paint,
31                                                        const Typeface* typeface) {
32    const Typeface* resolvedFace = Typeface::resolveDefault(typeface);
33
34    minikin::MinikinPaint minikinPaint(resolvedFace->fFontCollection);
35    /* Prepare minikin Paint */
36    minikinPaint.size =
37            paint->isLinearText() ? paint->getTextSize() : static_cast<int>(paint->getTextSize());
38    minikinPaint.scaleX = paint->getTextScaleX();
39    minikinPaint.skewX = paint->getTextSkewX();
40    minikinPaint.letterSpacing = paint->getLetterSpacing();
41    minikinPaint.wordSpacing = paint->getWordSpacing();
42    minikinPaint.paintFlags = MinikinFontSkia::packPaintFlags(paint);
43    minikinPaint.localeListId = paint->getMinikinLocaleListId();
44    minikinPaint.familyVariant = paint->getFamilyVariant();
45    minikinPaint.fontStyle = resolvedFace->fStyle;
46    minikinPaint.fontFeatureSettings = paint->getFontFeatureSettings();
47    return minikinPaint;
48}
49
50minikin::Layout MinikinUtils::doLayout(const Paint* paint, minikin::Bidi bidiFlags,
51                                       const Typeface* typeface, const uint16_t* buf, size_t start,
52                                       size_t count, size_t bufSize, minikin::MeasuredText* mt) {
53    minikin::MinikinPaint minikinPaint = prepareMinikinPaint(paint, typeface);
54    minikin::Layout layout;
55
56    const minikin::U16StringPiece textBuf(buf, bufSize);
57    const minikin::Range range(start, start + count);
58    const minikin::HyphenEdit hyphenEdit = static_cast<minikin::HyphenEdit>(paint->getHyphenEdit());
59    const minikin::StartHyphenEdit startHyphen = minikin::startHyphenEdit(hyphenEdit);
60    const minikin::EndHyphenEdit endHyphen = minikin::endHyphenEdit(hyphenEdit);
61
62    if (mt == nullptr) {
63        layout.doLayout(textBuf,range, bidiFlags, minikinPaint, startHyphen, endHyphen);
64    } else {
65        mt->buildLayout(textBuf, range, minikinPaint, bidiFlags, startHyphen, endHyphen, &layout);
66    }
67    return layout;
68}
69
70float MinikinUtils::measureText(const Paint* paint, minikin::Bidi bidiFlags,
71                                const Typeface* typeface, const uint16_t* buf, size_t start,
72                                size_t count, size_t bufSize, float* advances) {
73    minikin::MinikinPaint minikinPaint = prepareMinikinPaint(paint, typeface);
74    const minikin::U16StringPiece textBuf(buf, bufSize);
75    const minikin::Range range(start, start + count);
76    const minikin::HyphenEdit hyphenEdit = static_cast<minikin::HyphenEdit>(paint->getHyphenEdit());
77    const minikin::StartHyphenEdit startHyphen = minikin::startHyphenEdit(hyphenEdit);
78    const minikin::EndHyphenEdit endHyphen = minikin::endHyphenEdit(hyphenEdit);
79
80    return minikin::Layout::measureText(textBuf, range, bidiFlags, minikinPaint, startHyphen,
81                                        endHyphen, advances, nullptr /* extent */,
82                                        nullptr /* layout pieces */);
83}
84
85bool 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
90float 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
104float 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