From 88ff873959f7908c9b651e84a18eeba4c2510148 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=90=E5=8B=A4=E6=B0=91?= <xuqinmin@bjca.org.cn>
Date: Tue, 14 Apr 2026 23:00:45 +0800
Subject: [PATCH] =?UTF-8?q?feat(helper):=20=E6=B7=BB=E5=8A=A0=E4=BD=8D?=
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- 实现了采样位图解码功能，支持指定宽高要求
- 添加了计算采样大小的算法，优化内存使用
- 设置位图配置为RGB_565以减少内存占用
- 包含边界检查防止无效参数导致异常
- 提供了高效的图片加载解决方案
---
 .../brain/glass/helper/BitmapDecodeHelper.kt  | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 app/src/main/java/com/nova/brain/glass/helper/BitmapDecodeHelper.kt

diff --git a/app/src/main/java/com/nova/brain/glass/helper/BitmapDecodeHelper.kt b/app/src/main/java/com/nova/brain/glass/helper/BitmapDecodeHelper.kt
new file mode 100644
index 0000000..ff39f15
--- /dev/null
+++ b/app/src/main/java/com/nova/brain/glass/helper/BitmapDecodeHelper.kt
@@ -0,0 +1,41 @@
+package com.nova.brain.glass.helper
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import kotlin.math.max
+
+object BitmapDecodeHelper {
+    fun decodeSampledBitmap(path: String, reqWidth: Int, reqHeight: Int): Bitmap? {
+        val boundsOptions = BitmapFactory.Options().apply {
+            inJustDecodeBounds = true
+        }
+        BitmapFactory.decodeFile(path, boundsOptions)
+
+        val decodeOptions = BitmapFactory.Options().apply {
+            inSampleSize = calculateInSampleSize(boundsOptions, reqWidth, reqHeight)
+            inPreferredConfig = Bitmap.Config.RGB_565
+        }
+        return BitmapFactory.decodeFile(path, decodeOptions)
+    }
+
+    private fun calculateInSampleSize(
+        options: BitmapFactory.Options,
+        reqWidth: Int,
+        reqHeight: Int
+    ): Int {
+        val height = options.outHeight
+        val width = options.outWidth
+        if (height <= 0 || width <= 0 || reqWidth <= 0 || reqHeight <= 0) {
+            return 1
+        }
+        var inSampleSize = 1
+        if (height > reqHeight || width > reqWidth) {
+            val halfHeight = height / 2
+            val halfWidth = width / 2
+            while (halfHeight / inSampleSize >= reqHeight && halfWidth / inSampleSize >= reqWidth) {
+                inSampleSize *= 2
+            }
+        }
+        return max(1, inSampleSize)
+    }
+}