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 "MinikinSkia.h"
18
19 #include <SkFontDescriptor.h>
20 #include <SkFont.h>
21 #include <SkFontMetrics.h>
22 #include <SkFontMgr.h>
23 #include <SkTypeface.h>
24 #include <log/log.h>
25
26 #include <minikin/Font.h>
27 #include <minikin/MinikinExtent.h>
28 #include <minikin/MinikinPaint.h>
29 #include <minikin/MinikinRect.h>
30
31 namespace android {
32
MinikinFontSkia(sk_sp<SkTypeface> typeface,const void * fontData,size_t fontSize,std::string_view filePath,int ttcIndex,const std::vector<minikin::FontVariation> & axes)33 MinikinFontSkia::MinikinFontSkia(sk_sp<SkTypeface> typeface, const void* fontData, size_t fontSize,
34 std::string_view filePath, int ttcIndex,
35 const std::vector<minikin::FontVariation>& axes)
36 : minikin::MinikinFont(typeface->uniqueID())
37 , mTypeface(std::move(typeface))
38 , mFontData(fontData)
39 , mFontSize(fontSize)
40 , mTtcIndex(ttcIndex)
41 , mAxes(axes)
42 , mFilePath(filePath) {}
43
MinikinFontSkia_SetSkiaFont(const minikin::MinikinFont * font,SkFont * skFont,const minikin::MinikinPaint & paint,const minikin::FontFakery & fakery)44 static void MinikinFontSkia_SetSkiaFont(const minikin::MinikinFont* font, SkFont* skFont,
45 const minikin::MinikinPaint& paint,
46 const minikin::FontFakery& fakery) {
47 skFont->setSize(paint.size);
48 skFont->setScaleX(paint.scaleX);
49 skFont->setSkewX(paint.skewX);
50 MinikinFontSkia::unpackFontFlags(skFont, paint.fontFlags);
51 // Apply font fakery on top of user-supplied flags.
52 MinikinFontSkia::populateSkFont(skFont, font, fakery);
53 }
54
GetHorizontalAdvance(uint32_t glyph_id,const minikin::MinikinPaint & paint,const minikin::FontFakery & fakery) const55 float MinikinFontSkia::GetHorizontalAdvance(uint32_t glyph_id, const minikin::MinikinPaint& paint,
56 const minikin::FontFakery& fakery) const {
57 SkFont skFont;
58 uint16_t glyph16 = glyph_id;
59 SkScalar skWidth;
60 MinikinFontSkia_SetSkiaFont(this, &skFont, paint, fakery);
61 skFont.getWidths(&glyph16, 1, &skWidth);
62 #ifdef VERBOSE
63 ALOGD("width for typeface %d glyph %d = %f", mTypeface->uniqueID(), glyph_id, skWidth);
64 #endif
65 return skWidth;
66 }
67
GetHorizontalAdvances(uint16_t * glyph_ids,uint32_t count,const minikin::MinikinPaint & paint,const minikin::FontFakery & fakery,float * outAdvances) const68 void MinikinFontSkia::GetHorizontalAdvances(uint16_t* glyph_ids, uint32_t count,
69 const minikin::MinikinPaint& paint,
70 const minikin::FontFakery& fakery,
71 float* outAdvances) const {
72 SkFont skFont;
73 MinikinFontSkia_SetSkiaFont(this, &skFont, paint, fakery);
74 skFont.getWidths(glyph_ids, count, outAdvances);
75 }
76
GetBounds(minikin::MinikinRect * bounds,uint32_t glyph_id,const minikin::MinikinPaint & paint,const minikin::FontFakery & fakery) const77 void MinikinFontSkia::GetBounds(minikin::MinikinRect* bounds, uint32_t glyph_id,
78 const minikin::MinikinPaint& paint,
79 const minikin::FontFakery& fakery) const {
80 SkFont skFont;
81 uint16_t glyph16 = glyph_id;
82 SkRect skBounds;
83 MinikinFontSkia_SetSkiaFont(this, &skFont, paint, fakery);
84 skFont.getWidths(&glyph16, 1, nullptr, &skBounds);
85 bounds->mLeft = skBounds.fLeft;
86 bounds->mTop = skBounds.fTop;
87 bounds->mRight = skBounds.fRight;
88 bounds->mBottom = skBounds.fBottom;
89 }
90
GetFontExtent(minikin::MinikinExtent * extent,const minikin::MinikinPaint & paint,const minikin::FontFakery & fakery) const91 void MinikinFontSkia::GetFontExtent(minikin::MinikinExtent* extent,
92 const minikin::MinikinPaint& paint,
93 const minikin::FontFakery& fakery) const {
94 SkFont skFont;
95 MinikinFontSkia_SetSkiaFont(this, &skFont, paint, fakery);
96 SkFontMetrics metrics;
97 skFont.getMetrics(&metrics);
98 extent->ascent = metrics.fAscent;
99 extent->descent = metrics.fDescent;
100 }
101
GetSkTypeface() const102 SkTypeface* MinikinFontSkia::GetSkTypeface() const {
103 return mTypeface.get();
104 }
105
RefSkTypeface() const106 sk_sp<SkTypeface> MinikinFontSkia::RefSkTypeface() const {
107 return mTypeface;
108 }
109
GetFontData() const110 const void* MinikinFontSkia::GetFontData() const {
111 return mFontData;
112 }
113
GetFontSize() const114 size_t MinikinFontSkia::GetFontSize() const {
115 return mFontSize;
116 }
117
GetFontIndex() const118 int MinikinFontSkia::GetFontIndex() const {
119 return mTtcIndex;
120 }
121
GetAxes() const122 const std::vector<minikin::FontVariation>& MinikinFontSkia::GetAxes() const {
123 return mAxes;
124 }
125
createFontWithVariation(const std::vector<minikin::FontVariation> & variations) const126 std::shared_ptr<minikin::MinikinFont> MinikinFontSkia::createFontWithVariation(
127 const std::vector<minikin::FontVariation>& variations) const {
128 SkFontArguments params;
129
130 int ttcIndex;
131 std::unique_ptr<SkStreamAsset> stream(mTypeface->openStream(&ttcIndex));
132 LOG_ALWAYS_FATAL_IF(stream == nullptr, "openStream failed");
133
134 params.setCollectionIndex(ttcIndex);
135 std::vector<SkFontArguments::Axis> skAxes;
136 skAxes.resize(variations.size());
137 for (size_t i = 0; i < variations.size(); i++) {
138 skAxes[i].fTag = variations[i].axisTag;
139 skAxes[i].fStyleValue = SkFloatToScalar(variations[i].value);
140 }
141 params.setAxes(skAxes.data(), skAxes.size());
142 sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
143 sk_sp<SkTypeface> face(fm->makeFromStream(std::move(stream), params));
144
145 return std::make_shared<MinikinFontSkia>(std::move(face), mFontData, mFontSize, mFilePath,
146 ttcIndex, variations);
147 }
148
149 // hinting<<16 | edging<<8 | bools:5bits
packFontFlags(const SkFont & font)150 uint32_t MinikinFontSkia::packFontFlags(const SkFont& font) {
151 uint32_t flags = (unsigned)font.getHinting() << 16;
152 flags |= (unsigned)font.getEdging() << 8;
153 flags |= font.isEmbolden() << minikin::Embolden_Shift;
154 flags |= font.isLinearMetrics() << minikin::LinearMetrics_Shift;
155 flags |= font.isSubpixel() << minikin::Subpixel_Shift;
156 flags |= font.isEmbeddedBitmaps() << minikin::EmbeddedBitmaps_Shift;
157 flags |= font.isForceAutoHinting() << minikin::ForceAutoHinting_Shift;
158 return flags;
159 }
160
unpackFontFlags(SkFont * font,uint32_t flags)161 void MinikinFontSkia::unpackFontFlags(SkFont* font, uint32_t flags) {
162 // We store hinting in the top 16 bits (only need 2 of them)
163 font->setHinting((SkFontHinting)(flags >> 16));
164 // We store edging in bits 8:15 (only need 2 of them)
165 font->setEdging((SkFont::Edging)((flags >> 8) & 0xFF));
166 font->setEmbolden( (flags & minikin::Embolden_Flag) != 0);
167 font->setLinearMetrics( (flags & minikin::LinearMetrics_Flag) != 0);
168 font->setSubpixel( (flags & minikin::Subpixel_Flag) != 0);
169 font->setEmbeddedBitmaps( (flags & minikin::EmbeddedBitmaps_Flag) != 0);
170 font->setForceAutoHinting((flags & minikin::ForceAutoHinting_Flag) != 0);
171 }
172
populateSkFont(SkFont * skFont,const MinikinFont * font,minikin::FontFakery fakery)173 void MinikinFontSkia::populateSkFont(SkFont* skFont, const MinikinFont* font,
174 minikin::FontFakery fakery) {
175 skFont->setTypeface(reinterpret_cast<const MinikinFontSkia*>(font)->RefSkTypeface());
176 skFont->setEmbolden(skFont->isEmbolden() || fakery.isFakeBold());
177 if (fakery.isFakeItalic()) {
178 skFont->setSkewX(skFont->getSkewX() - 0.25f);
179 }
180 }
181 }
182