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 #define LOG_TAG "Minikin"
18
19 #include <cutils/log.h>
20 #include <stdlib.h>
21 #include <stdint.h>
22
23 #include "MinikinInternal.h"
24 #include <minikin/MinikinFont.h>
25 #include <minikin/AnalyzeStyle.h>
26 #include <minikin/CmapCoverage.h>
27 #include <minikin/FontFamily.h>
28 #include <UniquePtr.h>
29
30 using std::vector;
31
32 namespace android {
33
34 // Parse bcp-47 language identifier into internal structure
FontLanguage(const char * buf,size_t size)35 FontLanguage::FontLanguage(const char* buf, size_t size) {
36 uint32_t bits = 0;
37 size_t i;
38 for (i = 0; i < size; i++) {
39 uint16_t c = buf[i];
40 if (c == '-' || c == '_') break;
41 }
42 if (i == 2) {
43 bits = (uint8_t(buf[0]) << 8) | uint8_t(buf[1]);
44 }
45 size_t next;
46 for (i++; i < size; i = next + 1) {
47 for (next = i; next < size; next++) {
48 uint16_t c = buf[next];
49 if (c == '-' || c == '_') break;
50 }
51 if (next - i == 4 && buf[i] == 'H' && buf[i+1] == 'a' && buf[i+2] == 'n') {
52 if (buf[i+3] == 's') {
53 bits |= kHansFlag;
54 } else if (buf[i+3] == 't') {
55 bits |= kHantFlag;
56 }
57 }
58 // TODO: this might be a good place to infer script from country (zh_TW -> Hant),
59 // but perhaps it's up to the client to do that, before passing a string.
60 }
61 mBits = bits;
62 }
63
getString() const64 std::string FontLanguage::getString() const {
65 char buf[16];
66 size_t i = 0;
67 if (mBits & kBaseLangMask) {
68 buf[i++] = (mBits >> 8) & 0xFFu;
69 buf[i++] = mBits & 0xFFu;
70 }
71 if (mBits & kScriptMask) {
72 if (!i)
73 buf[i++] = 'x';
74 buf[i++] = '-';
75 buf[i++] = 'H';
76 buf[i++] = 'a';
77 buf[i++] = 'n';
78 if (mBits & kHansFlag)
79 buf[i++] = 's';
80 else
81 buf[i++] = 't';
82 }
83 return std::string(buf, i);
84 }
85
match(const FontLanguage other) const86 int FontLanguage::match(const FontLanguage other) const {
87 int result = 0;
88 if ((mBits & kBaseLangMask) == (other.mBits & kBaseLangMask)) {
89 result++;
90 if ((mBits & kScriptMask) != 0 && (mBits & kScriptMask) == (other.mBits & kScriptMask)) {
91 result++;
92 }
93 }
94 return result;
95 }
96
~FontFamily()97 FontFamily::~FontFamily() {
98 for (size_t i = 0; i < mFonts.size(); i++) {
99 mFonts[i].typeface->UnrefLocked();
100 }
101 }
102
addFont(MinikinFont * typeface)103 bool FontFamily::addFont(MinikinFont* typeface) {
104 AutoMutex _l(gMinikinLock);
105 const uint32_t os2Tag = MinikinFont::MakeTag('O', 'S', '/', '2');
106 size_t os2Size = 0;
107 bool ok = typeface->GetTable(os2Tag, NULL, &os2Size);
108 if (!ok) return false;
109 UniquePtr<uint8_t[]> os2Data(new uint8_t[os2Size]);
110 ok = typeface->GetTable(os2Tag, os2Data.get(), &os2Size);
111 if (!ok) return false;
112 int weight;
113 bool italic;
114 if (analyzeStyle(os2Data.get(), os2Size, &weight, &italic)) {
115 //ALOGD("analyzed weight = %d, italic = %s", weight, italic ? "true" : "false");
116 FontStyle style(weight, italic);
117 addFontLocked(typeface, style);
118 return true;
119 } else {
120 ALOGD("failed to analyze style");
121 }
122 return false;
123 }
124
addFont(MinikinFont * typeface,FontStyle style)125 void FontFamily::addFont(MinikinFont* typeface, FontStyle style) {
126 AutoMutex _l(gMinikinLock);
127 addFontLocked(typeface, style);
128 }
129
addFontLocked(MinikinFont * typeface,FontStyle style)130 void FontFamily::addFontLocked(MinikinFont* typeface, FontStyle style) { typeface->RefLocked();
131 mFonts.push_back(Font(typeface, style));
132 mCoverageValid = false;
133 }
134
135 // Compute a matching metric between two styles - 0 is an exact match
computeMatch(FontStyle style1,FontStyle style2)136 static int computeMatch(FontStyle style1, FontStyle style2) {
137 if (style1 == style2) return 0;
138 int score = abs(style1.getWeight() - style2.getWeight());
139 if (style1.getItalic() != style2.getItalic()) {
140 score += 2;
141 }
142 return score;
143 }
144
computeFakery(FontStyle wanted,FontStyle actual)145 static FontFakery computeFakery(FontStyle wanted, FontStyle actual) {
146 // If desired weight is semibold or darker, and 2 or more grades
147 // higher than actual (for example, medium 500 -> bold 700), then
148 // select fake bold.
149 int wantedWeight = wanted.getWeight();
150 bool isFakeBold = wantedWeight >= 6 && (wantedWeight - actual.getWeight()) >= 2;
151 bool isFakeItalic = wanted.getItalic() && !actual.getItalic();
152 return FontFakery(isFakeBold, isFakeItalic);
153 }
154
getClosestMatch(FontStyle style) const155 FakedFont FontFamily::getClosestMatch(FontStyle style) const {
156 const Font* bestFont = NULL;
157 int bestMatch = 0;
158 for (size_t i = 0; i < mFonts.size(); i++) {
159 const Font& font = mFonts[i];
160 int match = computeMatch(font.style, style);
161 if (i == 0 || match < bestMatch) {
162 bestFont = &font;
163 bestMatch = match;
164 }
165 }
166 FakedFont result;
167 if (bestFont == NULL) {
168 result.font = NULL;
169 } else {
170 result.font = bestFont->typeface;
171 result.fakery = computeFakery(style, bestFont->style);
172 }
173 return result;
174 }
175
getNumFonts() const176 size_t FontFamily::getNumFonts() const {
177 return mFonts.size();
178 }
179
getFont(size_t index) const180 MinikinFont* FontFamily::getFont(size_t index) const {
181 return mFonts[index].typeface;
182 }
183
getStyle(size_t index) const184 FontStyle FontFamily::getStyle(size_t index) const {
185 return mFonts[index].style;
186 }
187
getCoverage()188 const SparseBitSet* FontFamily::getCoverage() {
189 if (!mCoverageValid) {
190 const FontStyle defaultStyle;
191 MinikinFont* typeface = getClosestMatch(defaultStyle).font;
192 const uint32_t cmapTag = MinikinFont::MakeTag('c', 'm', 'a', 'p');
193 size_t cmapSize = 0;
194 bool ok = typeface->GetTable(cmapTag, NULL, &cmapSize);
195 UniquePtr<uint8_t[]> cmapData(new uint8_t[cmapSize]);
196 ok = typeface->GetTable(cmapTag, cmapData.get(), &cmapSize);
197 CmapCoverage::getCoverage(mCoverage, cmapData.get(), cmapSize);
198 #ifdef VERBOSE_DEBUG
199 ALOGD("font coverage length=%d, first ch=%x\n", mCoverage->length(),
200 mCoverage->nextSetBit(0));
201 #endif
202 mCoverageValid = true;
203 }
204 return &mCoverage;
205 }
206
207 } // namespace android
208