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Merge pull request #481 from gedoor/antecer

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添加TTF字体解析器
pull/487/head^2
Antecer 4 years ago committed by GitHub
parent 88779ee756 93b80d65f5
commit 98511982ff
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      app/src/main/java/io/legado/app/model/analyzeRule/QueryTTF.kt

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app/src/main/java/io/legado/app/model/analyzeRule/QueryTTF.kt
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package io.legado.app.model.analyzeRule
import io.legado.app.help.JsExtensions
import kotlin.experimental.and
@ExperimentalUnsignedTypes
/**
* 解析TTF字体
* @see <a href="https://docs.microsoft.com/en-us/typography/opentype/spec/">获取详情</a>
* @see <a href="https://photopea.github.io/Typr.js/demo/index.html">基于Javascript的TTF解析器</a>
*/
class QueryTTF(var font: ByteArray) : JsExtensions {
data class Index(var num: Int)
class FileHeader {
var majorVersion: UShort = 0u
var minorVersion: UShort = 0u
var numOfTables: UShort = 0u
var searchRange: UShort = 0u
var entrySelector: UShort = 0u
var rangeShift: UShort = 0u
}
class TableDirectory {
var tag: String = ""
var checkSum: UInt = 0u
var offset: UInt = 0u
var length: UInt = 0u
lateinit var data: ByteArray
}
class NameTable {
var format: UShort = 0u
var count: UShort = 0u
var stringOffset: UShort = 0u
var Records = ArrayList<NameRecord>()
}
class NameRecord {
var platformID: UShort = 0u
var encodingID: UShort = 0u
var languageID: UShort = 0u
var nameID: UShort = 0u
var length: UShort = 0u
var offset: UShort = 0u
lateinit var nameBuffer: ByteArray
}
class HeadTable {
var majorVersion: UShort = 0u
var minorVersion: UShort = 0u
var fontRevision: UInt = 0u
var checkSumAdjustment: UInt = 0u
var magicNumber: UInt = 0u
var flags: UShort = 0u
var unitsPerEm: UShort = 0u
var created: ULong = 0u
var modified: ULong = 0u
var xMin: Short = 0
var yMin: Short = 0
var xMax: Short = 0
var yMax: Short = 0
var macStyle: UShort = 0u
var lowestRecPPEM: UShort = 0u
var fontDirectionHint: Short = 0
var indexToLocFormat: Short = 0
var glyphDataFormat: Short = 0
}
class MaxpTable {
var majorVersion: UShort = 0u
var minorVersion: UShort = 0u
var numGlyphs: UShort = 0u // 字体中的字形数量
var maxPoints: UShort = 0u
var maxContours: UShort = 0u
var maxCompositePoints: UShort = 0u
var maxCompositeContours: UShort = 0u
var maxZones: UShort = 0u
var maxTwilightPoints: UShort = 0u
var maxStorage: UShort = 0u
var maxFunctionDefs: UShort = 0u
var maxInstructionDefs: UShort = 0u
var maxStackElements: UShort = 0u
var maxSizeOfInstructions: UShort = 0u
var maxComponentElements: UShort = 0u
var maxComponentDepth: UShort = 0u
}
class CmapTable {
var version: UShort = 0u
var numTables: UShort = 0u
var records = ArrayList<EncodingRecord>()
var tables = mutableMapOf<Int, Any>()
}
class EncodingRecord {
var platformID: UShort = 0u
var encodingID: UShort = 0u
var offset: UInt = 0u
}
class Format0 {
var format: UShort = 0u
var length: UShort = 0u
var language: UShort = 0u
var glyphIdArray = ByteArray(256)
}
class Format4 {
var format: UShort = 0u
var length: UShort = 0u
var language: UShort = 0u
var segCountX2: UShort = 0u
var searchRange: UShort = 0u
var entrySelector: UShort = 0u
var rangeShift: UShort = 0u
lateinit var endCode: IntArray // UInt16[]
var reservedPad: UShort = 0u
lateinit var startCode: IntArray // UInt16[]
lateinit var idDelta: ShortArray
lateinit var idRangeOffset: IntArray // UInt16[]
var glyphIdArray = ArrayList<UShort>()
}
class GlyfTable {
var numberOfContours: Short = 0
var xMin: Short = 0
var yMin: Short = 0
var xMax: Short = 0
var yMax: Short = 0
lateinit var endPtsOfContours: IntArray // UInt16[]
var instructionLength: Int = 0 // UInt16
lateinit var instructions: ByteArray
lateinit var flags: ByteArray
lateinit var xCoordinates: Array<Short>
lateinit var yCoordinates: Array<Short>
}
var Header = FileHeader()
var Tables = mutableMapOf<String, TableDirectory>()
var name = NameTable()
var head = HeadTable()
var maxp = MaxpTable()
var loca = ArrayList<UInt>()
var cmap = CmapTable()
var glyf = ArrayList<GlyfTable>()
// ByteArray转Long整数
private fun byteArrToUintx(buff: ByteArray): Long {
var result: Long = 0
var n: Int = 0
var i: Int = buff.size
while (i > 0) {
result = result or buff[--i].toLong().shl(n)
n += 8
}
return result
}
// 索引变量
var index = 0
// 从索引index开始拷贝指定长度的数组
private fun ByteArray.copyOfIndex(length: Int): ByteArray {
val fromIndex = index
index += length
return this.copyOfRange(fromIndex, fromIndex + length)
}
// 从索引fromIndex开始拷贝指定长度的数组
private fun ByteArray.copyOfIndex(fromIndex: Int, length: Int): ByteArray {
return this.copyOfRange(fromIndex, fromIndex + length)
}
init {
// 解析文件头
Header = FileHeader()
// 跳过不需要的数据条目
index = 4
Header.numOfTables = byteArrToUintx(font.copyOfIndex(2)).toUShort()
// 获取数据表
index = 12
for (i in 0 until Header.numOfTables.toInt()) {
val table = TableDirectory()
table.tag = font.copyOfIndex(4).toString(Charsets.US_ASCII)
table.checkSum = byteArrToUintx(font.copyOfIndex(4)).toUInt()
table.offset = byteArrToUintx(font.copyOfIndex(4)).toUInt()
table.length = byteArrToUintx(font.copyOfIndex(4)).toUInt()
table.data = font.copyOfIndex(table.offset.toInt(), table.length.toInt())
Tables[table.tag] = table
}
// 解析表 name (字体信息,包含版权、名称、作者等...)
run {
val data = Tables["name"]!!.data
index = 0
name.format = byteArrToUintx(data.copyOfIndex(2)).toUShort()
name.count = byteArrToUintx(data.copyOfIndex(2)).toUShort()
name.stringOffset = byteArrToUintx(data.copyOfIndex(2)).toUShort()
for (i in 0 until name.count.toInt()) {
val record = NameRecord()
record.platformID = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.encodingID = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.languageID = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.nameID = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.length = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.offset = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.nameBuffer = data.copyOfIndex((name.stringOffset + record.offset).toInt(), record.length.toInt())
name.Records.add(record)
}
}
// 解析表 head (获取 head.indexToLocFormat)
run {
val data = Tables["head"]!!.data
index = 0
head.majorVersion = byteArrToUintx(data.copyOfIndex(2)).toUShort()
head.minorVersion = byteArrToUintx(data.copyOfIndex(2)).toUShort()
head.fontRevision = byteArrToUintx(data.copyOfIndex(4)).toUInt()
head.checkSumAdjustment = byteArrToUintx(data.copyOfIndex(4)).toUInt()
head.magicNumber = byteArrToUintx(data.copyOfIndex(4)).toUInt()
head.flags = byteArrToUintx(data.copyOfIndex(2)).toUShort()
head.unitsPerEm = byteArrToUintx(data.copyOfIndex(2)).toUShort()
head.created = byteArrToUintx(data.copyOfIndex(8)).toULong()
head.modified = byteArrToUintx(data.copyOfIndex(8)).toULong()
head.xMin = byteArrToUintx(data.copyOfIndex(2)).toShort()
head.yMin = byteArrToUintx(data.copyOfIndex(2)).toShort()
head.xMax = byteArrToUintx(data.copyOfIndex(2)).toShort()
head.yMax = byteArrToUintx(data.copyOfIndex(2)).toShort()
head.macStyle = byteArrToUintx(data.copyOfIndex(2)).toUShort()
head.lowestRecPPEM = byteArrToUintx(data.copyOfIndex(2)).toUShort()
head.fontDirectionHint = byteArrToUintx(data.copyOfIndex(2)).toShort()
head.indexToLocFormat = byteArrToUintx(data.copyOfIndex(2)).toShort()
head.glyphDataFormat = byteArrToUintx(data.copyOfIndex(2)).toShort()
}
// 解析表 maxp (获取 maxp.numGlyphs)
run {
val data = Tables["maxp"]!!.data
index = 0
index = 0
maxp.majorVersion = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.minorVersion = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.numGlyphs = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxPoints = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxContours = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxCompositePoints = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxCompositeContours = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxZones = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxTwilightPoints = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxStorage = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxFunctionDefs = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxInstructionDefs = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxStackElements = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxSizeOfInstructions = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxComponentElements = byteArrToUintx(data.copyOfIndex(2)).toUShort()
maxp.maxComponentDepth = byteArrToUintx(data.copyOfIndex(2)).toUShort()
}
// 解析表 loca (轮廓数据偏移地址表)
run {
val data = Tables["maxp"]!!.data
val offset = if (head.indexToLocFormat.equals(0)) 2 else 4
index = 0
while (index < data.size) {
loca.add((byteArrToUintx(data.copyOfIndex(offset)) * (if (offset == 4) 1 else 2)).toUInt())
index += offset
}
}
// 解析表 cmap (Unicode编码轮廓索引对照表)
run {
val data = Tables["cmap"]!!.data
index = 0
cmap.version = byteArrToUintx(data.copyOfIndex(2)).toUShort()
cmap.numTables = byteArrToUintx(data.copyOfIndex(2)).toUShort()
for (i in 0 until cmap.numTables.toInt()) {
val record = EncodingRecord()
record.platformID = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.encodingID = byteArrToUintx(data.copyOfIndex(2)).toUShort()
record.offset = byteArrToUintx(data.copyOfIndex(4)).toUInt()
cmap.records.add(record)
val tmpIndex = index; // 缓存索引
index = record.offset.toInt()
val fmt = byteArrToUintx(data.copyOfIndex(2)).toUShort()
val len = byteArrToUintx(data.copyOfIndex(2)).toUShort()
val lang = byteArrToUintx(data.copyOfIndex(2)).toUShort()
if (fmt.equals(0)) {
val ft = Format0()
ft.format = fmt
ft.length = len
ft.language = lang
ft.glyphIdArray = data.copyOfIndex(index, len.toInt() - 6)
cmap.tables[fmt.toInt()] = ft
} else if (fmt.equals(4)) {
val ft = Format4()
ft.format = fmt
ft.length = len
ft.language = lang
ft.segCountX2 = byteArrToUintx(data.copyOfIndex(2)).toUShort()
val segCount = ft.segCountX2.toInt() / 2
ft.searchRange = byteArrToUintx(data.copyOfIndex(2)).toUShort()
ft.entrySelector = byteArrToUintx(data.copyOfIndex(2)).toUShort()
ft.rangeShift = byteArrToUintx(data.copyOfIndex(2)).toUShort()
ft.endCode = IntArray(segCount)
for (n in 0 until segCount) {
ft.endCode[n] = byteArrToUintx(data.copyOfIndex(2)).toInt()
}
ft.reservedPad = byteArrToUintx(data.copyOfIndex(2)).toUShort()
ft.startCode = IntArray(segCount)
for (n in 0 until segCount) {
ft.startCode[n] = byteArrToUintx(data.copyOfIndex(2)).toInt()
}
ft.idDelta = ShortArray(segCount)
for (n in 0 until segCount) {
ft.idDelta[n] = byteArrToUintx(data.copyOfIndex(2)).toShort()
}
ft.idRangeOffset = IntArray(segCount)
for (n in 0 until segCount) {
ft.idRangeOffset[n] = byteArrToUintx(data.copyOfIndex(2)).toInt()
}
while (index < len.toInt()) {
ft.glyphIdArray.add(byteArrToUintx(data.copyOfIndex(2)).toUShort())
}
cmap.tables[fmt.toInt()] = ft
}
index = tmpIndex; // 读取缓存的索引
}
}
// 解析表 glyf (字体轮廓数据表)
run {
val data = Tables["glyf"]!!.data
for (i in 0 until maxp.numGlyphs.toInt()) {
index = loca[i].toInt()
val numberOfContours = byteArrToUintx(data.copyOfIndex(2)).toShort()
val xMin = byteArrToUintx(data.copyOfIndex(2)).toShort()
val yMin = byteArrToUintx(data.copyOfIndex(2)).toShort()
val xMax = byteArrToUintx(data.copyOfIndex(2)).toShort()
val yMax = byteArrToUintx(data.copyOfIndex(2)).toShort()
if (numberOfContours > 0) {
val g = GlyfTable()
g.numberOfContours = numberOfContours
g.xMin = xMin
g.yMin = yMin
g.xMax = xMax
g.yMax = yMax
g.endPtsOfContours = IntArray(numberOfContours.toInt())
for (n in 0 until numberOfContours) {
g.endPtsOfContours[n] = byteArrToUintx(data.copyOfIndex(2)).toInt(); // 这里数据源为UShort
}
g.instructionLength = byteArrToUintx(data.copyOfIndex(2)).toInt(); // 这里数据源为UShort
g.instructions = data.copyOfIndex(g.instructionLength)
val flagLength = g.endPtsOfContours.last() + 1
g.flags = ByteArray(flagLength)
var n = 0
while (n < flagLength) {
val flag = data.copyOfIndex(1).first()
g.flags[n] = flag
if (!(flag and 0x08).equals(0)) {
var j = data.copyOfIndex(1).first()
while (j > 0) {
--j
g.flags[++n] = flag
}
}
++n
}
// 获取x轴相对坐标
g.xCoordinates = Array(flagLength) { 0 }
for (n in 0 until flagLength) {
val xByte = !(g.flags[n] and 0x02).equals(0)
val xSame = !(g.flags[n] and 0x10).equals(0)
if (xByte) {
g.xCoordinates[n] = ((if (xSame) 1 else -1) * data.copyOfIndex(1).first()).toShort()
} else {
if (xSame) g.xCoordinates[n] = 0
else {
g.xCoordinates[n] = byteArrToUintx(data.copyOfIndex(2)).toShort()
}
}
}
// 获取y轴相对坐标
g.yCoordinates = Array(flagLength) { 0 }
for (n in 0 until flagLength) {
val yByte = !(g.flags[n] and 0x04).equals(0)
val ySame = !(g.flags[n] and 0x20).equals(0)
if (yByte) {
g.yCoordinates[n] = ((if (ySame) 1 else -1) * data.copyOfIndex(1).first()).toShort()
} else {
if (ySame) g.yCoordinates[n] = 0
else {
g.yCoordinates[n] = byteArrToUintx(data.copyOfIndex(2)).toShort()
}
}
}
/*
PS:因为不需要绘制字体，转换就省了
// 相对坐标转绝对坐标
for (n in 0 until flagLength) {
g.xCoordinates[n] = (g.xCoordinates[n] + g.xCoordinates[n - 1]).toShort()
g.yCoordinates[n] = (g.yCoordinates[n] + g.yCoordinates[n - 1]).toShort()
}
*/
glyf.add(g)
} else {
// 复合字体暂不处理,以后用到再加
}
}
}
}
/**
* 获取字体信息（默认获取字体名称）
* @see <a href="https://docs.microsoft.com/en-us/typography/opentype/spec/name#name-ids">获取详情</a>
*/
fun GetName(nameID: Int = 1): String {
for (record in name.Records) {
if (!record.nameID.equals(nameID)) continue
if (record.platformID.equals(1) && record.encodingID.equals(0)) {
return record.nameBuffer.toString(Charsets.UTF_8)
} else if (record.platformID.equals(3) && record.encodingID.equals(1)) {
return record.nameBuffer.toString(Charsets.UTF_16BE)
}
}
return "error"
}
/**
* 获取字体轮廓 (fontCode:十进制Unicode字符编码)
*/
fun GetGlyf(fontCode: Int): ArrayList<Short> {
var fontIndex = -1; // 轮廓索引
val fmt4 = cmap.tables.getOrDefault(4, null)
if (fmt4 != null) {
val fmt = (fmt4 as Format4)
val endCode = fmt.endCode
for (i in endCode.indices) {
if (endCode[i] == fontCode) {
fontIndex = i
break
}
}
if (fontIndex == -1) fontIndex = 0
else if (fontCode < fmt.startCode[fontIndex]) fontIndex = 0
else {
if (fmt.idRangeOffset[fontIndex] != 0) {
fontIndex =
fmt.glyphIdArray[fontCode - fmt.startCode[fontIndex] + fmt.idRangeOffset[fontIndex].ushr(1) - (fmt.idRangeOffset.size - fontIndex)].toInt()
} else fontIndex = fontCode + fmt.idDelta[fontIndex]
fontIndex = fontIndex and 0xFFFF
}
} else {
val fmt0 = cmap.tables.getOrDefault(0, null)
if (fmt0 != null) {
val fmt = (fmt0 as Format0)
val glyphs = fmt.glyphIdArray
fontIndex = if (fontCode > glyphs.size) 0 else glyphs[fontCode].toInt()
}
}
val glyph = ArrayList<Short>()
if (fontIndex > -1) {
// 将字体的轮廓坐标合并到一起返回，方便使用
glyph.addAll(glyf[fontIndex].xCoordinates)
glyph.addAll(glyf[fontIndex].yCoordinates)
}
return glyph
}
}
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