Screenshot/Capture take too long time on MacOS

[cnwangjie]

• Robotgo version (or commit ref): v0.110.8
• Go version: go1.24.4 darwin/arm64
• Gcc version: Apple clang version 16.0.0 (clang-1600.0.26.6)
• Operating system and bit: macOS 15.4.1
• Resolution: 2056x1329
• Can you reproduce the bug at Examples:
  • Yes (provide example code)
  • No
  • Not relevant
• Provide example code:

package main

import (
	"github.com/go-vgo/robotgo"
)

func main() {
	robotgo.CaptureImg()
}

• Log gist:

❯ time go run main.go
go run main.go  0.96s user 0.95s system 12% cpu 15.653 total

Description

Just a CaptureImg call took 15s in my device. I'm not sure if it performs similarly on other OS.

I think the syscall with bitmap spend too much time.

Python's pillow library uses the subprocess method instead of syscall. It has great performance. I think we can refer to their implementation.

https://github.com/python-pillow/Pillow/blob/222b86222ea005936089a7086da24c95bc6cc3db/src/PIL/ImageGrab.py#L33-L116