优化图片text的效果

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

@@ -165,9 +165,12 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         lineBottom: Float,
     ) {
         ReadBook.book?.let { book ->
-            val rectF = RectF(textChar.start, lineTop, textChar.end, lineBottom)
             ImageProvider.getImage(book, textPage.chapterIndex, textChar.charData, true)
                 ?.let {
+                    /*以宽度为基准保持图片的原始比例叠加，当div为负数时，允许高度比字符更高*/
+                    val h = (textChar.end - textChar.start) / it.width * it.height
+                    val div = (lineBottom - lineTop - h) / 2
+                    val rectF = RectF(textChar.start, lineTop + div, textChar.end, lineBottom - div)
                     canvas.drawBitmap(it, null, rectF, null)
                 }
         }

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

@@ -69,7 +69,8 @@ object ChapterProvider {
     @JvmStatic
     lateinit var contentPaint: TextPaint
 
-    private const val srcReplaceChar = "🖼"
+    /*🖼字符长度是2，做自定义排版等一些处理时会异常，用卍取代*/
+    private const val srcReplaceChar = "卍"
 
     init {
         upStyle()