优化

app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt

@@ -90,6 +90,15 @@ object ChapterProvider {
     @JvmStatic
     private var titleBottomSpacing = 0
 
+    @JvmStatic
+    private var indentCharWidth = 0f
+
+    @JvmStatic
+    private var titlePaintTextHeight = 0f
+
+    @JvmStatic
+    private var  contentPaintTextHeight = 0f
+
     @JvmStatic
     var typeface: Typeface? = Typeface.DEFAULT
         private set
@@ -136,6 +145,7 @@ object ChapterProvider {
                     textPages,
                     stringBuilder,
                     titlePaint,
+                    titlePaintTextHeight,
                     isTitle = true,
                     emptyContent = contents.isEmpty(),
                     isVolumeTitle = bookChapter.isVolume
@@ -162,7 +172,14 @@ object ChapterProvider {
                 matcher.appendTail(sb)
                 text = sb.toString()
                 setTypeText(
-                    book, absStartX, durY, text, textPages, stringBuilder, contentPaint,
+                    book,
+                    absStartX,
+                    durY,
+                    text,
+                    textPages,
+                    stringBuilder,
+                    contentPaint,
+                    contentPaintTextHeight,
                     srcList = srcList
                 ).let {
                     absStartX = it.first
@@ -175,7 +192,14 @@ object ChapterProvider {
                     val text = content.substring(start, matcher.start())
                     if (text.isNotBlank()) {
                         setTypeText(
-                            book, absStartX, durY, text, textPages, stringBuilder, contentPaint
+                            book,
+                            absStartX,
+                            durY,
+                            text,
+                            textPages,
+                            stringBuilder,
+                            contentPaint,
+                            contentPaintTextHeight
                         ).let {
                             absStartX = it.first
                             durY = it.second
@@ -195,7 +219,8 @@ object ChapterProvider {
                             if (AppConfig.enableReview) text + reviewChar else text,
                             textPages,
                             stringBuilder,
-                            contentPaint
+                            contentPaint,
+                            contentPaintTextHeight
                         ).let {
                             absStartX = it.first
                             durY = it.second
@@ -305,6 +330,7 @@ object ChapterProvider {
         textPages: ArrayList<TextPage>,
         stringBuilder: StringBuilder,
         textPaint: TextPaint,
+        textHeight: Float,
         isTitle: Boolean = false,
         emptyContent: Boolean = false,
         isVolumeTitle: Boolean = false,
@@ -321,10 +347,10 @@ object ChapterProvider {
             emptyContent && textPages.size == 1 -> {
                 val textPage = textPages.last()
                 if (textPage.lineSize == 0) {
-                    val ty = (visibleHeight - layout.lineCount * textPaint.textHeight) / 2
+                    val ty = (visibleHeight - layout.lineCount * textHeight) / 2
                     if (ty > titleTopSpacing) ty else titleTopSpacing.toFloat()
                 } else {
-                    var textLayoutHeight = layout.lineCount * textPaint.textHeight
+                    var textLayoutHeight = layout.lineCount * textHeight
                     val fistLine = textPage.getLine(0)
                     if (fistLine.lineTop < textLayoutHeight + titleTopSpacing) {
                         textLayoutHeight = fistLine.lineTop - titleTopSpacing
@@ -430,16 +456,17 @@ object ChapterProvider {
                 else -> lastLine.paragraphNum
             }
             textLine.paragraphNum = paragraphNum
-            textLine.chapterPosition = textPages.foldIndexed(sbLength) { index, acc, textPage ->
-                acc + if (index == textPages.lastIndex) 0 else textPage.text.length
-            }
+            textLine.chapterPosition =
+                (textPages.getOrNull(textPages.lastIndex - 1)?.lines?.last()?.run {
+                    chapterPosition + charSize + if (isParagraphEnd) 1 else 0
+                } ?: 0) + sbLength
             textLine.pagePosition = sbLength
             textPages.last().addLine(textLine)
             textLine.upTopBottom(durY, textPaint)
-            durY += textPaint.textHeight * lineSpacingExtra
+            durY += textHeight * lineSpacingExtra
             textPages.last().height = durY
         }
-        durY += textPaint.textHeight * paragraphSpacing / 10f
+        durY += textHeight * paragraphSpacing / 10f
         return Pair(absStartX, durY)
     }
 
@@ -465,9 +492,8 @@ object ChapterProvider {
             return
         }
         val bodyIndent = ReadBookConfig.paragraphIndent
-        val icw = StaticLayout.getDesiredWidth(bodyIndent, textPaint) / bodyIndent.length
         for (char in bodyIndent.toStringArray()) {
-            val x1 = x + icw
+            val x1 = x + indentCharWidth
             textLine.addColumn(
                 TextColumn(
                     charData = char,
@@ -649,6 +675,10 @@ object ChapterProvider {
         paragraphSpacing = ReadBookConfig.paragraphSpacing
         titleTopSpacing = ReadBookConfig.titleTopSpacing.dpToPx()
         titleBottomSpacing = ReadBookConfig.titleBottomSpacing.dpToPx()
+        val bodyIndent = ReadBookConfig.paragraphIndent
+        indentCharWidth = StaticLayout.getDesiredWidth(bodyIndent, contentPaint) / bodyIndent.length
+        titlePaintTextHeight = titlePaint.textHeight
+        contentPaintTextHeight = contentPaint.textHeight
         upLayout()
     }
 

app/src/main/java/io/legado/app/utils/PaintExtensions.kt

@@ -3,4 +3,4 @@ package io.legado.app.utils
 import android.text.TextPaint
 
 val TextPaint.textHeight: Float
-    get() = fontMetrics.descent - fontMetrics.ascent + fontMetrics.leading
+    get() = fontMetrics.run { descent - ascent + leading }

modules/book/src/main/java/me/ag2s/epublib/domain/MediaTypes.java

@@ -53,10 +53,11 @@ public class MediaTypes {
             "application/adobe-page-template+xml", ".xpgt");
     public static final MediaType PLS = new MediaType("application/pls+xml",
             ".pls");
+    public static final MediaType UNKNOWN = new MediaType("application/octet-stream", "");
 
     public static final MediaType[] mediaTypes = new MediaType[]{
             XHTML, EPUB, JPG, PNG, GIF, CSS, SVG, TTF, NCX, XPGT, OPENTYPE, WOFF,
-            SMIL, PLS, JAVASCRIPT, MP3, MP4, OGG
+            SMIL, PLS, JAVASCRIPT, MP3, MP4, OGG, UNKNOWN
     };
 
     public static final Map<String, MediaType> mediaTypesByName = new HashMap<>();