Typeface.cpp revision 7a18b799617465a0a27dde1cf0c5f48c52db7980 
1/*
2 * Copyright (C) 2013 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/**
18 * This is the implementation of the Typeface object. Historically, it has
19 * just been SkTypeface, but we are migrating to Minikin. For the time
20 * being, that choice is hidden under the USE_MINIKIN compile-time flag.
21 */
22
23#include "Typeface.h"
24
25#include <pthread.h>
26#include <fcntl.h>  // For tests.
27#include <sys/stat.h>  // For tests.
28#include <sys/mman.h>  // For tests.
29
30#include "MinikinSkia.h"
31#include "SkTypeface.h"
32#include "SkPaint.h"
33#include "SkStream.h"  // Fot tests.
34
35#include <minikin/FontCollection.h>
36#include <minikin/FontFamily.h>
37#include <minikin/Layout.h>
38#include <utils/Log.h>
39
40namespace android {
41
42// Resolve the 1..9 weight based on base weight and bold flag
43static void resolveStyle(Typeface* typeface) {
44    int weight = typeface->fBaseWeight / 100;
45    if (typeface->fSkiaStyle & SkTypeface::kBold) {
46        weight += 3;
47    }
48    if (weight > 9) {
49        weight = 9;
50    }
51    bool italic = (typeface->fSkiaStyle & SkTypeface::kItalic) != 0;
52    typeface->fStyle = minikin::FontStyle(weight, italic);
53}
54
55Typeface* gDefaultTypeface = NULL;
56
57Typeface* Typeface::resolveDefault(Typeface* src) {
58    LOG_ALWAYS_FATAL_IF(gDefaultTypeface == nullptr);
59    return src == nullptr ? gDefaultTypeface : src;
60}
61
62Typeface* Typeface::createFromTypeface(Typeface* src, SkTypeface::Style style) {
63    Typeface* resolvedFace = Typeface::resolveDefault(src);
64    Typeface* result = new Typeface;
65    if (result != nullptr) {
66        result->fFontCollection = resolvedFace->fFontCollection;
67        result->fFontCollection->Ref();
68        result->fSkiaStyle = style;
69        result->fBaseWeight = resolvedFace->fBaseWeight;
70        resolveStyle(result);
71    }
72    return result;
73}
74
75Typeface* Typeface::createFromTypefaceWithVariation(Typeface* src,
76        const std::vector<minikin::FontVariation>& variations) {
77    Typeface* resolvedFace = Typeface::resolveDefault(src);
78    Typeface* result = new Typeface();
79    if (result != nullptr) {
80        result->fFontCollection =
81                resolvedFace->fFontCollection->createCollectionWithVariation(variations);
82        if (result->fFontCollection == nullptr) {
83            // None of passed axes are supported by this collection.
84            // So we will reuse the same collection with incrementing reference count.
85            result->fFontCollection = resolvedFace->fFontCollection;
86            result->fFontCollection->Ref();
87        }
88        result->fSkiaStyle = resolvedFace->fSkiaStyle;
89        result->fBaseWeight = resolvedFace->fBaseWeight;
90        resolveStyle(result);
91    }
92    return result;
93}
94
95Typeface* Typeface::createWeightAlias(Typeface* src, int weight) {
96    Typeface* resolvedFace = Typeface::resolveDefault(src);
97    Typeface* result = new Typeface;
98    if (result != nullptr) {
99        result->fFontCollection = resolvedFace->fFontCollection;
100        result->fFontCollection->Ref();
101        result->fSkiaStyle = resolvedFace->fSkiaStyle;
102        result->fBaseWeight = weight;
103        resolveStyle(result);
104    }
105    return result;
106}
107
108Typeface* Typeface::createFromFamilies(const std::vector<minikin::FontFamily*>& families) {
109    Typeface* result = new Typeface;
110    result->fFontCollection = new minikin::FontCollection(families);
111    if (families.empty()) {
112        ALOGW("createFromFamilies creating empty collection");
113        result->fSkiaStyle = SkTypeface::kNormal;
114    } else {
115        const minikin::FontStyle defaultStyle;
116        minikin::FontFamily* firstFamily = reinterpret_cast<minikin::FontFamily*>(families[0]);
117        minikin::MinikinFont* mf = firstFamily->getClosestMatch(defaultStyle).font;
118        if (mf != NULL) {
119            SkTypeface* skTypeface = reinterpret_cast<MinikinFontSkia*>(mf)->GetSkTypeface();
120            // TODO: probably better to query more precise style from family, will be important
121            // when we open up API to access 100..900 weights
122            result->fSkiaStyle = skTypeface->style();
123        } else {
124            result->fSkiaStyle = SkTypeface::kNormal;
125        }
126    }
127    result->fBaseWeight = 400;
128    resolveStyle(result);
129    return result;
130}
131
132void Typeface::unref() {
133    fFontCollection->Unref();
134    delete this;
135}
136
137void Typeface::setDefault(Typeface* face) {
138    gDefaultTypeface = face;
139}
140
141void Typeface::setRobotoTypefaceForTest() {
142    const char* kRobotoFont = "/system/fonts/Roboto-Regular.ttf";
143
144    int fd = open(kRobotoFont, O_RDONLY);
145    LOG_ALWAYS_FATAL_IF(fd == -1, "Failed to open file %s", kRobotoFont);
146    struct stat st = {};
147    LOG_ALWAYS_FATAL_IF(fstat(fd, &st) == -1, "Failed to stat file %s", kRobotoFont);
148    void* data = mmap(nullptr, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
149    std::unique_ptr<SkMemoryStream> fontData(new SkMemoryStream(data, st.st_size));
150    sk_sp<SkTypeface> typeface = SkTypeface::MakeFromStream(fontData.release());
151    LOG_ALWAYS_FATAL_IF(typeface == nullptr, "Failed to make typeface from %s", kRobotoFont);
152
153    minikin::MinikinFont* font = new MinikinFontSkia(std::move(typeface), data, st.st_size, 0,
154            std::vector<minikin::FontVariation>());
155    minikin::FontFamily* family = new minikin::FontFamily(
156                 std::vector<minikin::Font>({ minikin::Font(font, minikin::FontStyle()) }));
157    font->Unref();
158
159    std::vector<minikin::FontFamily*> typefaces = { family };
160    minikin::FontCollection *collection = new minikin::FontCollection(typefaces);
161    family->Unref();
162
163    Typeface* hwTypeface = new Typeface();
164    hwTypeface->fFontCollection = collection;
165    hwTypeface->fSkiaStyle = SkTypeface::kNormal;
166    hwTypeface->fBaseWeight = 400;
167    hwTypeface->fStyle = minikin::FontStyle(4 /* weight */, false /* italic */);
168
169    Typeface::setDefault(hwTypeface);
170}
171
172}
173