MinikinSkia.cpp revision 296bf8c55aaba0025f3e5b904fda3b6e15686753
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 mTypeface(typeface), mFontData(fontData), mFontSize(fontSize), mTtcIndex(ttcIndex) { 28} 29 30MinikinFontSkia::~MinikinFontSkia() { 31 SkSafeUnref(mTypeface); 32} 33 34static void MinikinFontSkia_SetSkiaPaint(const MinikinFont* font, SkPaint* skPaint, const 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 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(MinikinRect* bounds, uint32_t glyph_id, 58 const 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 70const void* MinikinFontSkia::GetTable(uint32_t tag, size_t* size, MinikinDestroyFunc* destroy) { 71 // we don't have a buffer to the font data, copy to own buffer 72 const size_t tableSize = mTypeface->getTableSize(tag); 73 *size = tableSize; 74 if (tableSize == 0) { 75 return nullptr; 76 } 77 void* buf = malloc(tableSize); 78 if (buf == nullptr) { 79 return nullptr; 80 } 81 mTypeface->getTableData(tag, 0, tableSize, buf); 82 *destroy = free; 83 return buf; 84} 85 86SkTypeface *MinikinFontSkia::GetSkTypeface() const { 87 return mTypeface; 88} 89 90const void* MinikinFontSkia::GetFontData() const { 91 return mFontData; 92} 93 94size_t MinikinFontSkia::GetFontSize() const { 95 return mFontSize; 96} 97 98int MinikinFontSkia::GetFontIndex() const { 99 return mTtcIndex; 100} 101 102int32_t MinikinFontSkia::GetUniqueId() const { 103 return mTypeface->uniqueID(); 104} 105 106uint32_t MinikinFontSkia::packPaintFlags(const SkPaint* paint) { 107 uint32_t flags = paint->getFlags(); 108 SkPaint::Hinting hinting = paint->getHinting(); 109 // select only flags that might affect text layout 110 flags &= (SkPaint::kAntiAlias_Flag | SkPaint::kFakeBoldText_Flag | SkPaint::kLinearText_Flag | 111 SkPaint::kSubpixelText_Flag | SkPaint::kDevKernText_Flag | 112 SkPaint::kEmbeddedBitmapText_Flag | SkPaint::kAutoHinting_Flag | 113 SkPaint::kVerticalText_Flag); 114 flags |= (hinting << 16); 115 return flags; 116} 117 118void MinikinFontSkia::unpackPaintFlags(SkPaint* paint, uint32_t paintFlags) { 119 paint->setFlags(paintFlags & SkPaint::kAllFlags); 120 paint->setHinting(static_cast<SkPaint::Hinting>(paintFlags >> 16)); 121} 122 123void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, FontFakery fakery) { 124 paint->setTypeface(reinterpret_cast<const MinikinFontSkia*>(font)->GetSkTypeface()); 125 paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold()); 126 if (fakery.isFakeItalic()) { 127 paint->setTextSkewX(paint->getTextSkewX() - 0.25f); 128 } 129} 130 131} 132