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      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 #include "Typeface.h"
     18 
     19 #include <fcntl.h>  // For tests.
     20 #include <pthread.h>
     21 #include <sys/mman.h>  // For tests.
     22 #include <sys/stat.h>  // For tests.
     23 
     24 #include "MinikinSkia.h"
     25 #include "SkPaint.h"
     26 #include "SkStream.h"  // Fot tests.
     27 #include "SkTypeface.h"
     28 
     29 #include <minikin/FontCollection.h>
     30 #include <minikin/FontFamily.h>
     31 #include <minikin/Layout.h>
     32 #include <utils/Log.h>
     33 #include <utils/MathUtils.h>
     34 
     35 namespace android {
     36 
     37 static Typeface::Style computeAPIStyle(int weight, bool italic) {
     38     // This bold detection comes from SkTypeface.h
     39     if (weight >= SkFontStyle::kSemiBold_Weight) {
     40         return italic ? Typeface::kBoldItalic : Typeface::kBold;
     41     } else {
     42         return italic ? Typeface::kItalic : Typeface::kNormal;
     43     }
     44 }
     45 
     46 static minikin::FontStyle computeMinikinStyle(int weight, bool italic) {
     47     return minikin::FontStyle(uirenderer::MathUtils::clamp(weight, 1, 1000),
     48                               static_cast<minikin::FontStyle::Slant>(italic));
     49 }
     50 
     51 // Resolve the relative weight from the baseWeight and target style.
     52 static minikin::FontStyle computeRelativeStyle(int baseWeight, Typeface::Style relativeStyle) {
     53     int weight = baseWeight;
     54     if ((relativeStyle & Typeface::kBold) != 0) {
     55         weight += 300;
     56     }
     57     bool italic = (relativeStyle & Typeface::kItalic) != 0;
     58     return computeMinikinStyle(weight, italic);
     59 }
     60 
     61 const Typeface* gDefaultTypeface = NULL;
     62 
     63 const Typeface* Typeface::resolveDefault(const Typeface* src) {
     64     LOG_ALWAYS_FATAL_IF(src == nullptr && gDefaultTypeface == nullptr);
     65     return src == nullptr ? gDefaultTypeface : src;
     66 }
     67 
     68 Typeface* Typeface::createRelative(Typeface* src, Typeface::Style style) {
     69     const Typeface* resolvedFace = Typeface::resolveDefault(src);
     70     Typeface* result = new Typeface;
     71     if (result != nullptr) {
     72         result->fFontCollection = resolvedFace->fFontCollection;
     73         result->fBaseWeight = resolvedFace->fBaseWeight;
     74         result->fAPIStyle = style;
     75         result->fStyle = computeRelativeStyle(result->fBaseWeight, style);
     76     }
     77     return result;
     78 }
     79 
     80 Typeface* Typeface::createAbsolute(Typeface* base, int weight, bool italic) {
     81     const Typeface* resolvedFace = Typeface::resolveDefault(base);
     82     Typeface* result = new Typeface();
     83     if (result != nullptr) {
     84         result->fFontCollection = resolvedFace->fFontCollection;
     85         result->fBaseWeight = resolvedFace->fBaseWeight;
     86         result->fAPIStyle = computeAPIStyle(weight, italic);
     87         result->fStyle = computeMinikinStyle(weight, italic);
     88     }
     89     return result;
     90 }
     91 
     92 Typeface* Typeface::createFromTypefaceWithVariation(
     93         Typeface* src, const std::vector<minikin::FontVariation>& variations) {
     94     const Typeface* resolvedFace = Typeface::resolveDefault(src);
     95     Typeface* result = new Typeface();
     96     if (result != nullptr) {
     97         result->fFontCollection =
     98                 resolvedFace->fFontCollection->createCollectionWithVariation(variations);
     99         if (result->fFontCollection == nullptr) {
    100             // None of passed axes are supported by this collection.
    101             // So we will reuse the same collection with incrementing reference count.
    102             result->fFontCollection = resolvedFace->fFontCollection;
    103         }
    104         // Do not update styles.
    105         // TODO: We may want to update base weight if the 'wght' is specified.
    106         result->fBaseWeight = resolvedFace->fBaseWeight;
    107         result->fAPIStyle = resolvedFace->fAPIStyle;
    108         result->fStyle = resolvedFace->fStyle;
    109     }
    110     return result;
    111 }
    112 
    113 Typeface* Typeface::createWithDifferentBaseWeight(Typeface* src, int weight) {
    114     const Typeface* resolvedFace = Typeface::resolveDefault(src);
    115     Typeface* result = new Typeface;
    116     if (result != nullptr) {
    117         result->fFontCollection = resolvedFace->fFontCollection;
    118         result->fBaseWeight = weight;
    119         result->fAPIStyle = resolvedFace->fAPIStyle;
    120         result->fStyle = computeRelativeStyle(weight, result->fAPIStyle);
    121     }
    122     return result;
    123 }
    124 
    125 Typeface* Typeface::createFromFamilies(std::vector<std::shared_ptr<minikin::FontFamily>>&& families,
    126                                        int weight, int italic) {
    127     Typeface* result = new Typeface;
    128     result->fFontCollection.reset(new minikin::FontCollection(families));
    129 
    130     if (weight == RESOLVE_BY_FONT_TABLE || italic == RESOLVE_BY_FONT_TABLE) {
    131         int weightFromFont;
    132         bool italicFromFont;
    133 
    134         const minikin::FontStyle defaultStyle;
    135         const minikin::MinikinFont* mf = families.empty() ? nullptr
    136                 : families[0]->getClosestMatch(defaultStyle).font->typeface().get();
    137         if (mf != nullptr) {
    138             SkTypeface* skTypeface = reinterpret_cast<const MinikinFontSkia*>(mf)->GetSkTypeface();
    139             const SkFontStyle& style = skTypeface->fontStyle();
    140             weightFromFont = style.weight();
    141             italicFromFont = style.slant() != SkFontStyle::kUpright_Slant;
    142         } else {
    143             // We can't obtain any information from fonts. Just use default values.
    144             weightFromFont = SkFontStyle::kNormal_Weight;
    145             italicFromFont = false;
    146         }
    147 
    148         if (weight == RESOLVE_BY_FONT_TABLE) {
    149             weight = weightFromFont;
    150         }
    151         if (italic == RESOLVE_BY_FONT_TABLE) {
    152             italic = italicFromFont ? 1 : 0;
    153         }
    154     }
    155 
    156     // Sanitize the invalid value passed from public API.
    157     if (weight < 0) {
    158         weight = SkFontStyle::kNormal_Weight;
    159     }
    160 
    161     result->fBaseWeight = weight;
    162     result->fAPIStyle = computeAPIStyle(weight, italic);
    163     result->fStyle = computeMinikinStyle(weight, italic);
    164     return result;
    165 }
    166 
    167 void Typeface::setDefault(const Typeface* face) {
    168     gDefaultTypeface = face;
    169 }
    170 
    171 void Typeface::setRobotoTypefaceForTest() {
    172     const char* kRobotoFont = "/system/fonts/Roboto-Regular.ttf";
    173 
    174     int fd = open(kRobotoFont, O_RDONLY);
    175     LOG_ALWAYS_FATAL_IF(fd == -1, "Failed to open file %s", kRobotoFont);
    176     struct stat st = {};
    177     LOG_ALWAYS_FATAL_IF(fstat(fd, &st) == -1, "Failed to stat file %s", kRobotoFont);
    178     void* data = mmap(nullptr, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
    179     std::unique_ptr<SkMemoryStream> fontData(new SkMemoryStream(data, st.st_size));
    180     sk_sp<SkTypeface> typeface = SkTypeface::MakeFromStream(fontData.release());
    181     LOG_ALWAYS_FATAL_IF(typeface == nullptr, "Failed to make typeface from %s", kRobotoFont);
    182 
    183     std::shared_ptr<minikin::MinikinFont> font = std::make_shared<MinikinFontSkia>(
    184             std::move(typeface), data, st.st_size, 0, std::vector<minikin::FontVariation>());
    185     std::vector<minikin::Font> fonts;
    186     fonts.push_back(minikin::Font::Builder(font).build());
    187 
    188     std::shared_ptr<minikin::FontCollection> collection = std::make_shared<minikin::FontCollection>(
    189             std::make_shared<minikin::FontFamily>(std::move(fonts)));
    190 
    191     Typeface* hwTypeface = new Typeface();
    192     hwTypeface->fFontCollection = collection;
    193     hwTypeface->fAPIStyle = Typeface::kNormal;
    194     hwTypeface->fBaseWeight = SkFontStyle::kNormal_Weight;
    195     hwTypeface->fStyle = minikin::FontStyle();
    196 
    197     Typeface::setDefault(hwTypeface);
    198 }
    199 }  // namespace android
    200