feat: 优化代码

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

@@ -1,8 +1,6 @@
 package io.legado.app.ui.book.read.page.delegate
 
 import android.graphics.*
-import android.graphics.drawable.BitmapDrawable
-import android.graphics.drawable.ColorDrawable
 import android.graphics.drawable.GradientDrawable
 import android.os.Build
 import io.legado.app.help.ReadBookConfig
@@ -271,13 +269,7 @@ class SimulationPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageVi
         mMatrix.setValues(mMatrixArray)
         mMatrix.preTranslate(-mBezierControl1.x, -mBezierControl1.y)
         mMatrix.postTranslate(mBezierControl1.x, mBezierControl1.y)
-        ReadBookConfig.bg?.let {
-            if (it is BitmapDrawable) {
-                canvas.drawBitmap(it.bitmap, 0f, 0f, mPaint)
-            } else if (it is ColorDrawable) {
-                canvas.drawColor(it.color)
-            }
-        }
+        canvas.drawColor(ReadBookConfig.bgMeanColor)
         canvas.drawBitmap(bitmap, mMatrix, mPaint)
         mPaint.colorFilter = null
         canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y)