Hi Hans,
I tried to get the boundry of Chinese punctuation in the scrp-cjk.lua file. Such as the bounding box information of Chinese comma in the AdobeSongStd-Light.otf font:
bbox[1] = 36,
bbox[2] = -78,
bbox[3] = 963,
bbox[4] = 833
However I got the following result with luatex + plain
bbox[1] = 171,
bbox[2] = -58,
bbox[3] = 370,
bbox[4] = 240
The latter is right.
What's the reason for it?
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Best regards,
Li Yanrui