Typeface.cpp revision a0a4828614edfd633ab86f04408e7f4e55b491dd 
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 != 0) {
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::createWeightAlias(Typeface* src, int weight) {
76    Typeface* resolvedFace = Typeface::resolveDefault(src);
77    Typeface* result = new Typeface;
78    if (result != 0) {
79        result->fFontCollection = resolvedFace->fFontCollection;
80        result->fFontCollection->Ref();
81        result->fSkiaStyle = resolvedFace->fSkiaStyle;
82        result->fBaseWeight = weight;
83        resolveStyle(result);
84    }
85    return result;
86}
87
88Typeface* Typeface::createFromFamilies(const std::vector<minikin::FontFamily*>& families) {
89    Typeface* result = new Typeface;
90    result->fFontCollection = new minikin::FontCollection(families);
91    if (families.empty()) {
92        ALOGW("createFromFamilies creating empty collection");
93        result->fSkiaStyle = SkTypeface::kNormal;
94    } else {
95        const minikin::FontStyle defaultStyle;
96        minikin::FontFamily* firstFamily = reinterpret_cast<minikin::FontFamily*>(families[0]);
97        minikin::MinikinFont* mf = firstFamily->getClosestMatch(defaultStyle).font;
98        if (mf != NULL) {
99            SkTypeface* skTypeface = reinterpret_cast<MinikinFontSkia*>(mf)->GetSkTypeface();
100            // TODO: probably better to query more precise style from family, will be important
101            // when we open up API to access 100..900 weights
102            result->fSkiaStyle = skTypeface->style();
103        } else {
104            result->fSkiaStyle = SkTypeface::kNormal;
105        }
106    }
107    result->fBaseWeight = 400;
108    resolveStyle(result);
109    return result;
110}
111
112void Typeface::unref() {
113    fFontCollection->Unref();
114    delete this;
115}
116
117void Typeface::setDefault(Typeface* face) {
118    gDefaultTypeface = face;
119}
120
121void Typeface::setRobotoTypefaceForTest() {
122    const char* kRobotoFont = "/system/fonts/Roboto-Regular.ttf";
123
124    int fd = open(kRobotoFont, O_RDONLY);
125    LOG_ALWAYS_FATAL_IF(fd == -1, "Failed to open file %s", kRobotoFont);
126    struct stat st = {};
127    LOG_ALWAYS_FATAL_IF(fstat(fd, &st) == -1, "Failed to stat file %s", kRobotoFont);
128    void* data = mmap(nullptr, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
129    std::unique_ptr<SkMemoryStream> fontData(new SkMemoryStream(data, st.st_size));
130    sk_sp<SkTypeface> typeface = SkTypeface::MakeFromStream(fontData.release());
131    LOG_ALWAYS_FATAL_IF(typeface == nullptr, "Failed to make typeface from %s", kRobotoFont);
132
133    minikin::MinikinFont* font = new MinikinFontSkia(std::move(typeface), data, st.st_size, 0);
134    minikin::FontFamily* family = new minikin::FontFamily(
135                 std::vector<minikin::Font>({ minikin::Font(font, minikin::FontStyle()) }));
136    font->Unref();
137
138    std::vector<minikin::FontFamily*> typefaces = { family };
139    minikin::FontCollection *collection = new minikin::FontCollection(typefaces);
140    family->Unref();
141
142    Typeface* hwTypeface = new Typeface();
143    hwTypeface->fFontCollection = collection;
144    hwTypeface->fSkiaStyle = SkTypeface::kNormal;
145    hwTypeface->fBaseWeight = 400;
146    hwTypeface->fStyle = minikin::FontStyle(4 /* weight */, false /* italic */);
147
148    Typeface::setDefault(hwTypeface);
149}
150
151}
152