addWeighted outputs incorrectly when any element in src2 is zero

[willSapgreen]

Expected behaviour

For each pixel, the output should follow dst = src1 * alpha + src2 * beta + gamma

Actual behaviour

If a pixel's value in src2 is zero, dst = src1

For example, given alpha = 0.5 src1 [110 126 239] src2 [0 0 0] dst [110 126 239]

Steps to reproduce

• example code

alpha = 0.5
beta = 1.0 - alpha
dst = cv2.addWeighted(src1, alpha, src2, beta, 0.0)

• operating system: Ubuntu 20.04.6 LTS

• architecture: x86

• opencv-python version: 4.10.0

Issue submission checklist

• [ ] This is not a generic OpenCV usage question (looking for help for coding, other usage questions, homework etc.)
• [x] I have read the README of this repository and understand that this repository provides only an automated build toolchain for OpenCV Python packages (there is no actual OpenCV code here)
• [x] The issue is related to the build scripts in this repository, to the pre-built binaries or is a feature request (such as "please enable this additional dependency")
• [x] I'm using the latest version of opencv-python