MinikinSkia.cpp revision b93872ad64afaafa1799a293850f48a96708182e
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 <SkPaint.h> 20#include <SkTypeface.h> 21#include <cutils/log.h> 22 23namespace android { 24 25MinikinFontSkia::MinikinFontSkia(SkTypeface* typeface, const void* fontData, size_t fontSize, 26 int ttcIndex) : 27 MinikinFont(typeface->uniqueID()), mTypeface(typeface), mFontData(fontData), 28 mFontSize(fontSize), mTtcIndex(ttcIndex) { 29} 30 31MinikinFontSkia::~MinikinFontSkia() { 32 SkSafeUnref(mTypeface); 33} 34 35static void MinikinFontSkia_SetSkiaPaint(const MinikinFont* font, SkPaint* skPaint, const MinikinPaint& paint) { 36 skPaint->setTextEncoding(SkPaint::kGlyphID_TextEncoding); 37 skPaint->setTextSize(paint.size); 38 skPaint->setTextScaleX(paint.scaleX); 39 skPaint->setTextSkewX(paint.skewX); 40 MinikinFontSkia::unpackPaintFlags(skPaint, paint.paintFlags); 41 // Apply font fakery on top of user-supplied flags. 42 MinikinFontSkia::populateSkPaint(skPaint, font, paint.fakery); 43} 44 45float MinikinFontSkia::GetHorizontalAdvance(uint32_t glyph_id, 46 const MinikinPaint &paint) const { 47 SkPaint skPaint; 48 uint16_t glyph16 = glyph_id; 49 SkScalar skWidth; 50 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint); 51 skPaint.getTextWidths(&glyph16, sizeof(glyph16), &skWidth, NULL); 52#ifdef VERBOSE 53 ALOGD("width for typeface %d glyph %d = %f", mTypeface->uniqueID(), glyph_id, skWidth); 54#endif 55 return skWidth; 56} 57 58void MinikinFontSkia::GetBounds(MinikinRect* bounds, uint32_t glyph_id, 59 const MinikinPaint& paint) const { 60 SkPaint skPaint; 61 uint16_t glyph16 = glyph_id; 62 SkRect skBounds; 63 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint); 64 skPaint.getTextWidths(&glyph16, sizeof(glyph16), NULL, &skBounds); 65 bounds->mLeft = skBounds.fLeft; 66 bounds->mTop = skBounds.fTop; 67 bounds->mRight = skBounds.fRight; 68 bounds->mBottom = skBounds.fBottom; 69} 70 71const void* MinikinFontSkia::GetTable(uint32_t tag, size_t* size, MinikinDestroyFunc* destroy) { 72 // we don't have a buffer to the font data, copy to own buffer 73 const size_t tableSize = mTypeface->getTableSize(tag); 74 *size = tableSize; 75 if (tableSize == 0) { 76 return nullptr; 77 } 78 void* buf = malloc(tableSize); 79 if (buf == nullptr) { 80 return nullptr; 81 } 82 mTypeface->getTableData(tag, 0, tableSize, buf); 83 *destroy = free; 84 return buf; 85} 86 87SkTypeface *MinikinFontSkia::GetSkTypeface() const { 88 return mTypeface; 89} 90 91const void* MinikinFontSkia::GetFontData() const { 92 return mFontData; 93} 94 95size_t MinikinFontSkia::GetFontSize() const { 96 return mFontSize; 97} 98 99int MinikinFontSkia::GetFontIndex() const { 100 return mTtcIndex; 101} 102 103uint32_t MinikinFontSkia::packPaintFlags(const SkPaint* paint) { 104 uint32_t flags = paint->getFlags(); 105 SkPaint::Hinting hinting = paint->getHinting(); 106 // select only flags that might affect text layout 107 flags &= (SkPaint::kAntiAlias_Flag | SkPaint::kFakeBoldText_Flag | SkPaint::kLinearText_Flag | 108 SkPaint::kSubpixelText_Flag | SkPaint::kDevKernText_Flag | 109 SkPaint::kEmbeddedBitmapText_Flag | SkPaint::kAutoHinting_Flag | 110 SkPaint::kVerticalText_Flag); 111 flags |= (hinting << 16); 112 return flags; 113} 114 115void MinikinFontSkia::unpackPaintFlags(SkPaint* paint, uint32_t paintFlags) { 116 paint->setFlags(paintFlags & SkPaint::kAllFlags); 117 paint->setHinting(static_cast<SkPaint::Hinting>(paintFlags >> 16)); 118} 119 120void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, FontFakery fakery) { 121 paint->setTypeface(reinterpret_cast<const MinikinFontSkia*>(font)->GetSkTypeface()); 122 paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold()); 123 if (fakery.isFakeItalic()) { 124 paint->setTextSkewX(paint->getTextSkewX() - 0.25f); 125 } 126} 127 128} 129