优化

app/src/main/java/io/legado/app/help/ReadBookConfig.kt

@@ -92,7 +92,7 @@ object ReadBookConfig {
         val height = dm.heightPixels
         bg = durConfig.curBgDrawable(width, height).apply {
             if (this is BitmapDrawable) {
-                bgMeanColor = BitmapUtils.getMeanColor(bitmap)
+                bgMeanColor = bitmap.getMeanColor()
             } else if (this is ColorDrawable) {
                 bgMeanColor = color
             }

app/src/main/java/io/legado/app/help/ThemeConfig.kt

@@ -63,7 +63,7 @@ object ThemeConfig {
         if (bgCfg.second == 0) {
             return bgImage
         }
-        return BitmapUtils.stackBlur(bgImage, bgCfg.second.toFloat())
+        return bgImage.stackBlur(bgCfg.second.toFloat())
     }
 
     fun upConfig() {

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

@@ -1,3 +1,5 @@
+@file:Suppress("unused")
+
 package io.legado.app.utils
 
 import android.content.Context
@@ -14,7 +16,7 @@ import java.io.IOException
 import kotlin.math.*
 
 
-@Suppress("unused", "WeakerAccess", "MemberVisibilityCanBePrivate")
+@Suppress("WeakerAccess", "MemberVisibilityCanBePrivate")
 object BitmapUtils {
 
     /**
@@ -142,7 +144,6 @@ object BitmapUtils {
         return BitmapFactory.decodeStream(inputStream, null, op)
     }
 
-
     //图片不被压缩
     fun convertViewToBitmap(view: View, bitmapWidth: Int, bitmapHeight: Int): Bitmap {
         val bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Config.ARGB_8888)
@@ -150,7 +151,6 @@ object BitmapUtils {
         return bitmap
     }
 
-
     /**
      * @param options
      * @param minSideLength
@@ -220,10 +220,11 @@ object BitmapUtils {
         }
     }
 
-    fun changeBitmapSize(bitmap: Bitmap, newWidth: Int, newHeight: Int): Bitmap {
+}
 
-        val width = bitmap.width
-        val height = bitmap.height
+fun Bitmap.changeSize(newWidth: Int, newHeight: Int): Bitmap {
+    val width = this.width
+    val height = this.height
 
     //计算压缩的比率
     var scaleWidth = newWidth.toFloat() / width
@@ -240,17 +241,16 @@ object BitmapUtils {
     matrix.postScale(scaleWidth, scaleHeight)
 
     //获取新的bitmap
-        return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true)
+    return Bitmap.createBitmap(this, 0, 0, width, height, matrix, true)
 
 }
 
 /**
  * 高斯模糊
  */
-    fun stackBlur(srcBitmap: Bitmap?, radius: Float = 8f): Bitmap? {
-        if (srcBitmap == null) return null
+fun Bitmap.stackBlur(radius: Float = 8f): Bitmap? {
     val rs = RenderScript.create(appCtx)
-        val blurredBitmap = srcBitmap.copy(Config.ARGB_8888, true)
+    val blurredBitmap = this.copy(Config.ARGB_8888, true)
 
     //分配用于渲染脚本的内存
     val input = Allocation.createFromBitmap(
@@ -277,16 +277,19 @@ object BitmapUtils {
     return blurredBitmap
 }
 
-    fun getMeanColor(bitmap: Bitmap): Int {
-        val width: Int = bitmap.width
-        val height: Int = bitmap.height
+/**
+ * 取平均色
+ */
+fun Bitmap.getMeanColor(): Int {
+    val width: Int = this.width
+    val height: Int = this.height
     var pixel: Int
     var pixelSumRed = 0
     var pixelSumBlue = 0
     var pixelSumGreen = 0
     for (i in 0..99) {
         for (j in 70..99) {
-                pixel = bitmap.getPixel(
+            pixel = this.getPixel(
                 (i * width / 100.toFloat()).roundToInt(),
                 (j * height / 100.toFloat()).roundToInt()
             )
@@ -304,5 +307,3 @@ object BitmapUtils {
         averagePixelBlue + 3
     )
 }
-
-}

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

@@ -182,7 +182,7 @@ object QRCodeUtils {
         hints: Map<DecodeHintType?, Any?> = DecodeFormatManager.ALL_HINTS
     ): Result? {
         if (bitmap.width > reqWidth || bitmap.height > reqHeight) {
-            val bm = BitmapUtils.changeBitmapSize(bitmap, reqWidth, reqHeight)
+            val bm = bitmap.changeSize(reqWidth, reqHeight)
             return parseCodeResult(getRGBLuminanceSource(bm), hints)
         }
         return parseCodeResult(getRGBLuminanceSource(bitmap), hints)