From 620abe646800ce90f909d918248e26fd05ab75f1 Mon Sep 17 00:00:00 2001
From: tsm <2418639820@qq.com>
Date: Wed, 22 May 2024 16:30:02 +0800
Subject: [PATCH] =?UTF-8?q?=E9=99=8D=E9=87=87=E6=A0=B7=E9=80=82=E9=85=8D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: tsm <2418639820@qq.com>
---
 .../downsampling/DownsampleStartegy.ets       | 67 ++-----------------
 1 file changed, 7 insertions(+), 60 deletions(-)

diff --git a/library/src/main/ets/components/imageknife/downsampling/DownsampleStartegy.ets b/library/src/main/ets/components/imageknife/downsampling/DownsampleStartegy.ets
index c0ae2a9..8223d1e 100644
--- a/library/src/main/ets/components/imageknife/downsampling/DownsampleStartegy.ets
+++ b/library/src/main/ets/components/imageknife/downsampling/DownsampleStartegy.ets
@@ -24,30 +24,13 @@ export class FitCenter implements BaseDownsampling {
 
   //实现 getScaleFactor 方法
   getScaleFactor(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number): number {
-    const IS_BITMAP_FACTORY_SCALING_SUPPORTED = false; //这里需要根据实际情况设置这个值
-    if (IS_BITMAP_FACTORY_SCALING_SUPPORTED) {
-      const widthPercentage = requestedWidth / sourceWidth
-      const heightPercentage = requestedHeight / sourceHeight
-      return Math.min(widthPercentage, heightPercentage)
-    } else {
-      //类似 AT_LEAST,但只要求一个维度或另一个维度大于等于请求的尺寸
-      const maxIntegerFactor = Math.max(sourceHeight / requestedHeight, sourceWidth / requestedWidth);
-      const a = maxIntegerFactor === 0 ? 1 : 1 / highestOneBit(maxIntegerFactor)
-      return a;
-    }
+    const maxIntegerFactor = Math.max(sourceHeight / requestedHeight, sourceWidth / requestedWidth);
+    const a = maxIntegerFactor === 0 ? 1 : 1 / highestOneBit(maxIntegerFactor)
+    return a;
   }
 
-  //实现 getSampleSizeRounding 方法
   getSampleSizeRounding(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number): number {
-    const IS_BITMAP_FACTORY_SCALING_SUPPORTED = true; //这里需要根据实际情况设置这个值
 
-    // if (!IS_BITMAP_FACTORY_SCALING_SUPPORTED) {
-    //   return 0;
-    // } else {
-    //   TODO: 这个逻辑可能不正确，但是如果不这样做，我们可能会跳过一个采样尺寸，因为 QUALITY 更喜欢宽度和高度缩放因子中比较小的那个
-    //    MEMORY 折中方案,他让我们更喜欢两者中较大的那个
-    //
-    // }
     return SampleSizeRounding.MEMORY;
   }
 }
@@ -131,16 +114,10 @@ export class AtMost implements BaseDownsampling {
     const maxIntegerFactor = Math.ceil(Math.max(sourceHeight / requestedHeight, sourceWidth / requestedWidth));
     let lesserOrEqualSampleSize = Math.max(1, highestOneBit(maxIntegerFactor));
     let greaterOrEqualSampleSize = lesserOrEqualSampleSize
-    // if (lesserOrEqualSampleSize < maxIntegerFactor) {
-    //   let greaterOrEqualSampleSize = lesserOrEqualSampleSize <<= 1; // lest shift by 1
-    // }
     greaterOrEqualSampleSize = lesserOrEqualSampleSize << (lesserOrEqualSampleSize < maxIntegerFactor ? 1 : 0)
     //返回缩放因子
     return 1 / greaterOrEqualSampleSize
   }
-
-
-
   //实现 getSampleSizeRounding 方法
   getSampleSizeRounding(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestHeight: number): SampleSizeRounding {
     //根据 AtMost 的逻辑，总是返回 MEMORY
@@ -159,25 +136,15 @@ export class CenterInside implements BaseDownsampling {
   getScaleFactor(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number): number {
     //获取 FIT_CENTER 的缩放因子
     const fitCenterScaleFactor: ESObject = this.getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight);
-    //实现 getScaleFactor 方法
     //返回不超过 1 的缩放因子，即尽量缩小图像以适应目标尺寸，但不会放大
     return Math.min(1, fitCenterScaleFactor);
 
   }
 
   getScale(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number): number {
-    const IS_BITMAP_FACTORY_SCALING_SUPPORTED = false; //这里需要根据实际情况设置这个值
-    if (IS_BITMAP_FACTORY_SCALING_SUPPORTED) {
-      const widthPercentage = requestedWidth / sourceWidth
-      const heightPercentage = requestedHeight / sourceHeight
-      return Math.min(widthPercentage, heightPercentage)
-    } else {
-      //类似 AT_LEAST,但只要求一个维度或另一个维度大于等于请求的尺寸
-      const maxIntegerFactor = Math.max(sourceHeight / requestedHeight, sourceWidth / requestedWidth);
-
-      return maxIntegerFactor === 0 ? 1 : 1 / highestOneBit(maxIntegerFactor);
-
-    }
+    //类似 AT_LEAST
+    const maxIntegerFactor = Math.max(sourceHeight / requestedHeight, sourceWidth / requestedWidth);
+    return maxIntegerFactor === 0 ? 1 : 1 / highestOneBit(maxIntegerFactor);
   }
 
 
@@ -190,27 +157,7 @@ export class CenterInside implements BaseDownsampling {
     //否则，使用 FIL_CENTER 的 SampleSizeRounding 值
     return this.getSampleSize(sourceWidth, sourceHeight, requestedWidth, requestedHeight);
   }
-  //实现 getSampleSizeRounding 方法
   getSampleSize(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number): SampleSizeRounding {
-    const IS_BITMAP_FACTORY_SCALING_SUPPORTED = true; //这里需要根据实际情况设置这个值
-
-    if (IS_BITMAP_FACTORY_SCALING_SUPPORTED) {
-      return 0;
-    } else {
-      //   TODO: 这个逻辑可能不正确，但是如果不这样做，我们可能会跳过一个采样尺寸，因为 QUALITY 更喜欢宽度和高度缩放因子中比较小的那个
-      //    MEMORY 折中方案,他让我们更喜欢两者中较大的那个
-      //
-      // }
-      return SampleSizeRounding.MEMORY;
-    }
+    return SampleSizeRounding.MEMORY;
   }
-}
-
-export enum DownsampleStrategy {
-  AT_LEAST,
-  AT_MOST,
-  FIT_CENTER,
-  CENTER_INSIDE,
-  CENTER_OUTSIDE,
-  NONE,
 }
\ No newline at end of file