pyautogui.size() on OS X Retina Macbook Pro about pyautogui

[asweigart]

What's the version of OS X you have? (The specific version, like Mavericks 10.0.4 or such.)

[dsiah]

Yosemite version 10.10.1

[jeremygray]

Related, not sure if you'd like a separate issue for this: On Mac 10.9.5 with a retina display 1440 x 900, I get screenshot() sizes that are exactly twice as large as expected. This appears to carry through to the locate() family of functions, and return coordinates that are off by a factor of 2.

>>>> pyautogui.screenshot()
<PIL.PngImagePlugin.PngImageFile image mode=RGB size=2880x1800 at 0x106CFCF80>

[faurehu]

I ran a tracer to follow the interpretation of pyautogui and apparently it gets stuck here:
pyautogui/__init__.py:122 line return platformModule._size()

platformModule being pyautogui._pyautogui_osx I looked into it and the _size() method makes use of Quartz.CGDisplayPixelsWide(0). Tracing that function gave me this:

        Quartz/__init__.py:79    return            mod.QuickLookUI = m
                                 ...       return value: None
        Quartz/__init__.py:83    return    _load()
                                 ...       return value: None

Looking at the init file, m is supposed to be QuickLookUI, also in the Quartz folder. I can't tell why the return value is None.

[aaruff]

I also experienced the same issue (MacBook Pro 10.10.3 (Retina, 13-inch, Late 2013)). Though I remedied the issue by replace 0 with Quartz.CGMainDisplayID() in the _size function. Further investigation is required to determine why exactly this issue arose in the first place.

def _size():
    return Quartz.CGDisplayPixelsWide(Quartz.CGMainDisplayID()), Quartz.CGDisplayPixelsHigh(Quartz.CGMainDisplayID())