libs/hwui/hwui/Typeface.cpp

   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 #include <utils/MathUtils.h>
  40
  41 namespace android {
  42
  43 static SkTypeface::Style computeSkiaStyle(int weight, bool italic) {
  44     // This bold detection comes from SkTypeface.h
  45     if (weight >= SkFontStyle::kSemiBold_Weight) {
  46         return italic ? SkTypeface::kBoldItalic : SkTypeface::kBold;
  47     } else {
  48         return italic ? SkTypeface::kItalic : SkTypeface::kNormal;
  49     }
  50 }
  51
  52 static minikin::FontStyle computeMinikinStyle(int weight, bool italic) {
  53     // TODO: Better to use raw base weight value for font selection instead of dividing by 100.
  54     const int minikinWeight = uirenderer::MathUtils::clamp((weight + 50) / 100, 1, 10);
  55     return minikin::FontStyle(minikinWeight, italic);
  56 }
  57
  58 // Resolve the relative weight from the baseWeight and target style.
  59 static minikin::FontStyle computeRelativeStyle(int baseWeight, SkTypeface::Style relativeStyle) {
  60     int weight = baseWeight;
  61     if ((relativeStyle & SkTypeface::kBold) != 0) {
  62         weight += 300;
  63     }
  64     bool italic = (relativeStyle & SkTypeface::kItalic) != 0;
  65     return computeMinikinStyle(weight, italic);
  66 }
  67
  68 Typeface* gDefaultTypeface = NULL;
  69
  70 Typeface* Typeface::resolveDefault(Typeface* src) {
  71     LOG_ALWAYS_FATAL_IF(src == nullptr && gDefaultTypeface == nullptr);
  72     return src == nullptr ? gDefaultTypeface : src;
  73 }
  74
  75 Typeface* Typeface::createRelative(Typeface* src, SkTypeface::Style style) {
  76     Typeface* resolvedFace = Typeface::resolveDefault(src);
  77     Typeface* result = new Typeface;
  78     if (result != nullptr) {
  79         result->fFontCollection = resolvedFace->fFontCollection;
  80         result->fBaseWeight = resolvedFace->fBaseWeight;
  81         result->fSkiaStyle = style;
  82         result->fStyle = computeRelativeStyle(result->fBaseWeight, style);
  83     }
  84     return result;
  85 }
  86
  87 Typeface* Typeface::createAbsolute(Typeface* base, int weight, bool italic) {
  88     Typeface* resolvedFace = Typeface::resolveDefault(base);
  89     Typeface* result = new Typeface();
  90     if (result != nullptr) {
  91         result->fFontCollection = resolvedFace->fFontCollection;
  92         result->fBaseWeight = resolvedFace->fBaseWeight;
  93         result->fSkiaStyle = computeSkiaStyle(weight, italic);
  94         result->fStyle = computeMinikinStyle(weight, italic);
  95     }
  96     return result;
  97 }
  98
  99 Typeface* Typeface::createFromTypefaceWithVariation(Typeface* src,
 100         const std::vector<minikin::FontVariation>& variations) {
 101     Typeface* resolvedFace = Typeface::resolveDefault(src);
 102     Typeface* result = new Typeface();
 103     if (result != nullptr) {
 104         result->fFontCollection =
 105                 resolvedFace->fFontCollection->createCollectionWithVariation(variations);
 106         if (result->fFontCollection == nullptr) {
 107             // None of passed axes are supported by this collection.
 108             // So we will reuse the same collection with incrementing reference count.
 109             result->fFontCollection = resolvedFace->fFontCollection;
 110         }
 111         // Do not update styles.
 112         // TODO: We may want to update base weight if the 'wght' is specified.
 113         result->fBaseWeight = resolvedFace->fBaseWeight;
 114         result->fSkiaStyle = resolvedFace->fSkiaStyle;
 115         result->fStyle = resolvedFace->fStyle;
 116     }
 117     return result;
 118 }
 119
 120 Typeface* Typeface::createWithDifferentBaseWeight(Typeface* src, int weight) {
 121     Typeface* resolvedFace = Typeface::resolveDefault(src);
 122     Typeface* result = new Typeface;
 123     if (result != nullptr) {
 124         result->fFontCollection = resolvedFace->fFontCollection;
 125         result->fBaseWeight = weight;
 126         result->fSkiaStyle = resolvedFace->fSkiaStyle;
 127         result->fStyle = computeRelativeStyle(weight, result->fSkiaStyle);
 128     }
 129     return result;
 130 }
 131
 132 Typeface* Typeface::createFromFamilies(
 133         std::vector<std::shared_ptr<minikin::FontFamily>>&& families,
 134         int weight, int italic) {
 135     Typeface* result = new Typeface;
 136     result->fFontCollection.reset(new minikin::FontCollection(families));
 137
 138     if (weight == RESOLVE_BY_FONT_TABLE || italic == RESOLVE_BY_FONT_TABLE) {
 139         int weightFromFont;
 140         bool italicFromFont;
 141
 142         const minikin::FontStyle defaultStyle;
 143         const minikin::MinikinFont* mf =
 144                 families.empty() ?  nullptr : families[0]->getClosestMatch(defaultStyle).font;
 145         if (mf != nullptr) {
 146             SkTypeface* skTypeface = reinterpret_cast<const MinikinFontSkia*>(mf)->GetSkTypeface();
 147             const SkFontStyle& style = skTypeface->fontStyle();
 148             weightFromFont = style.weight();
 149             italicFromFont = style.slant() != SkFontStyle::kUpright_Slant;
 150         } else {
 151             // We can't obtain any information from fonts. Just use default values.
 152             weightFromFont = SkFontStyle::kNormal_Weight;
 153             italicFromFont = false;
 154         }
 155
 156         if (weight == RESOLVE_BY_FONT_TABLE) {
 157             weight = weightFromFont;
 158         }
 159         if (italic == RESOLVE_BY_FONT_TABLE) {
 160             italic = italicFromFont? 1 : 0;
 161         }
 162     }
 163
 164     // Sanitize the invalid value passed from public API.
 165     if (weight < 0) {
 166         weight = SkFontStyle::kNormal_Weight;
 167     }
 168
 169     result->fBaseWeight = weight;
 170     result->fSkiaStyle = computeSkiaStyle(weight, italic);
 171     result->fStyle = computeMinikinStyle(weight, italic);
 172     return result;
 173 }
 174
 175 void Typeface::setDefault(Typeface* face) {
 176     gDefaultTypeface = face;
 177 }
 178
 179 void Typeface::setRobotoTypefaceForTest() {
 180     const char* kRobotoFont = "/system/fonts/Roboto-Regular.ttf";
 181
 182     int fd = open(kRobotoFont, O_RDONLY);
 183     LOG_ALWAYS_FATAL_IF(fd == -1, "Failed to open file %s", kRobotoFont);
 184     struct stat st = {};
 185     LOG_ALWAYS_FATAL_IF(fstat(fd, &st) == -1, "Failed to stat file %s", kRobotoFont);
 186     void* data = mmap(nullptr, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
 187     std::unique_ptr<SkMemoryStream> fontData(new SkMemoryStream(data, st.st_size));
 188     sk_sp<SkTypeface> typeface = SkTypeface::MakeFromStream(fontData.release());
 189     LOG_ALWAYS_FATAL_IF(typeface == nullptr, "Failed to make typeface from %s", kRobotoFont);
 190
 191     std::shared_ptr<minikin::MinikinFont> font = std::make_shared<MinikinFontSkia>(
 192             std::move(typeface), data, st.st_size, 0, std::vector<minikin::FontVariation>());
 193     std::shared_ptr<minikin::FontFamily> family = std::make_shared<minikin::FontFamily>(
 194             std::vector<minikin::Font>({ minikin::Font(std::move(font), minikin::FontStyle()) }));
 195     std::shared_ptr<minikin::FontCollection> collection =
 196             std::make_shared<minikin::FontCollection>(std::move(family));
 197
 198     Typeface* hwTypeface = new Typeface();
 199     hwTypeface->fFontCollection = collection;
 200     hwTypeface->fSkiaStyle = SkTypeface::kNormal;
 201     hwTypeface->fBaseWeight = SkFontStyle::kNormal_Weight;
 202     hwTypeface->fStyle = minikin::FontStyle(4 /* weight */, false /* italic */);
 203
 204     Typeface::setDefault(hwTypeface);
 205 }
 206
 207 }