计算Y分量平均值

app/src/main/cpp/camera2/ndkcamera.cpp

@@ -740,11 +740,11 @@ void NdkCamera::onImageAvailable(AImageReader* reader)
     AImage_getPlaneData(image, 2, &v_data, &v_len);
 
 #if __cplusplus >= 201703L
-    uint64_t avgy = std::reduce(y_data, y_data + y_len, 0) / y_len;
+    uint64_t avgy = std::reduce(y_data, y_data + y_len, 0);
 #else
-    uint64_t avgy = std::accumulate(y_data, y_data + y_len, 0) / y_len;
+    uint64_t avgy = std::accumulate(y_data, y_data + y_len, 0);
 #endif
-    mResult.avgY = avgy;
+    mResult.avgY = avgy / y_len;
 
     if (u_data == v_data + 1 && v_data == y_data + width * height && y_pixelStride == 1 && u_pixelStride == 2 && v_pixelStride == 2 && y_rowStride == width && u_rowStride == width && v_rowStride == width)
     {