Merge branch 'feat/liujie'

src/utils/processImage.ts

@@ -0,0 +1,33 @@
+export async function getTextColorOnImage(url) {
+  let canvas
+  const width = 100
+  const height = 50
+  try {
+    // 1. 创建离屏Canvas
+    canvas = wx.createOffscreenCanvas({ type: '2d', width, height })
+    const ctx = canvas.getContext('2d')
+
+    // 2. 加载图片
+    const img = canvas.createImage()
+    await new Promise((resolve) => {
+      img.onload = resolve
+      img.src = url
+    })
+
+    // 3. 绘制并分析图像
+    ctx.drawImage(img, 0, 0, width, height)
+
+    // TODO: 增加取样，提高精确性
+    const pixelData = ctx.getImageData(10, 10, 1, 1).data
+
+    // 4. 计算文字颜色
+    const brightness = (pixelData[0] * 2126 + pixelData[1] * 7152 + pixelData[2] * 722) / 10000
+    return { textColor: brightness > 128 ? 'black' : 'white' }
+  } finally {
+    // 释放资源
+    if (canvas) {
+      canvas.width = 0;
+      canvas.height = 0;
+    }
+  }
+}