MinikinSkia.cpp revision c7064146f959caec058980ced144942c8044a169
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 <log/log.h> 20#include <SkFontDescriptor.h> 21#include <SkFontMgr.h> 22#include <SkPaint.h> 23#include <SkTypeface.h> 24 25namespace android { 26 27MinikinFontSkia::MinikinFontSkia(sk_sp<SkTypeface> typeface, const void* fontData, size_t fontSize, 28 int ttcIndex, const std::vector<minikin::FontVariation>& axes) : 29 minikin::MinikinFont(typeface->uniqueID()), mTypeface(std::move(typeface)), mFontData(fontData), 30 mFontSize(fontSize), mTtcIndex(ttcIndex), mAxes(axes) { 31} 32 33static void MinikinFontSkia_SetSkiaPaint(const minikin::MinikinFont* font, SkPaint* skPaint, 34 const minikin::MinikinPaint& paint) { 35 skPaint->setTextEncoding(SkPaint::kGlyphID_TextEncoding); 36 skPaint->setTextSize(paint.size); 37 skPaint->setTextScaleX(paint.scaleX); 38 skPaint->setTextSkewX(paint.skewX); 39 MinikinFontSkia::unpackPaintFlags(skPaint, paint.paintFlags); 40 // Apply font fakery on top of user-supplied flags. 41 MinikinFontSkia::populateSkPaint(skPaint, font, paint.fakery); 42} 43 44float MinikinFontSkia::GetHorizontalAdvance(uint32_t glyph_id, 45 const minikin::MinikinPaint &paint) const { 46 SkPaint skPaint; 47 uint16_t glyph16 = glyph_id; 48 SkScalar skWidth; 49 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint); 50 skPaint.getTextWidths(&glyph16, sizeof(glyph16), &skWidth, NULL); 51#ifdef VERBOSE 52 ALOGD("width for typeface %d glyph %d = %f", mTypeface->uniqueID(), glyph_id, skWidth); 53#endif 54 return skWidth; 55} 56 57void MinikinFontSkia::GetBounds(minikin::MinikinRect* bounds, uint32_t glyph_id, 58 const minikin::MinikinPaint& paint) const { 59 SkPaint skPaint; 60 uint16_t glyph16 = glyph_id; 61 SkRect skBounds; 62 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint); 63 skPaint.getTextWidths(&glyph16, sizeof(glyph16), NULL, &skBounds); 64 bounds->mLeft = skBounds.fLeft; 65 bounds->mTop = skBounds.fTop; 66 bounds->mRight = skBounds.fRight; 67 bounds->mBottom = skBounds.fBottom; 68} 69 70SkTypeface *MinikinFontSkia::GetSkTypeface() const { 71 return mTypeface.get(); 72} 73 74sk_sp<SkTypeface> MinikinFontSkia::RefSkTypeface() const { 75 return mTypeface; 76} 77 78const void* MinikinFontSkia::GetFontData() const { 79 return mFontData; 80} 81 82size_t MinikinFontSkia::GetFontSize() const { 83 return mFontSize; 84} 85 86int MinikinFontSkia::GetFontIndex() const { 87 return mTtcIndex; 88} 89 90const std::vector<minikin::FontVariation>& MinikinFontSkia::GetAxes() const { 91 return mAxes; 92} 93 94std::shared_ptr<minikin::MinikinFont> MinikinFontSkia::createFontWithVariation( 95 const std::vector<minikin::FontVariation>& variations) const { 96 SkFontMgr::FontParameters params; 97 98 int ttcIndex; 99 SkStreamAsset* stream = mTypeface->openStream(&ttcIndex); 100 LOG_ALWAYS_FATAL_IF(stream == nullptr, "openStream failed"); 101 102 params.setCollectionIndex(ttcIndex); 103 std::vector<SkFontMgr::FontParameters::Axis> skAxes; 104 skAxes.resize(variations.size()); 105 for (size_t i = 0; i < variations.size(); i++) { 106 skAxes[i].fTag = variations[i].axisTag; 107 skAxes[i].fStyleValue = SkFloatToScalar(variations[i].value); 108 } 109 params.setAxes(skAxes.data(), skAxes.size()); 110 sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault()); 111 sk_sp<SkTypeface> face(fm->createFromStream(stream, params)); 112 113 return std::make_shared<MinikinFontSkia>(std::move(face), mFontData, mFontSize, ttcIndex, 114 variations); 115} 116 117uint32_t MinikinFontSkia::packPaintFlags(const SkPaint* paint) { 118 uint32_t flags = paint->getFlags(); 119 SkPaint::Hinting hinting = paint->getHinting(); 120 // select only flags that might affect text layout 121 flags &= (SkPaint::kAntiAlias_Flag | SkPaint::kFakeBoldText_Flag | SkPaint::kLinearText_Flag | 122 SkPaint::kSubpixelText_Flag | SkPaint::kDevKernText_Flag | 123 SkPaint::kEmbeddedBitmapText_Flag | SkPaint::kAutoHinting_Flag | 124 SkPaint::kVerticalText_Flag); 125 flags |= (hinting << 16); 126 return flags; 127} 128 129void MinikinFontSkia::unpackPaintFlags(SkPaint* paint, uint32_t paintFlags) { 130 paint->setFlags(paintFlags & SkPaint::kAllFlags); 131 paint->setHinting(static_cast<SkPaint::Hinting>(paintFlags >> 16)); 132} 133 134void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, 135 minikin::FontFakery fakery) { 136 paint->setTypeface(reinterpret_cast<const MinikinFontSkia*>(font)->RefSkTypeface()); 137 paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold()); 138 if (fakery.isFakeItalic()) { 139 paint->setTextSkewX(paint->getTextSkewX() - 0.25f); 140 } 141} 142 143} 144