Font substitution/fallback does not work for non-embedded font

espresso3389 / pdfrx

pdfrx is yet another PDF viewer implementation that built on the top of pdfium. The plugin currently supports Android, iOS, Windows, macOS, Linux, and Web.

MIT License

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Font substitution/fallback does not work for non-embedded font #140

Closed weiqingiqng closed 1 week ago

weiqingiqng commented 3 weeks ago

iOS： WechatIMG163 Real pdf file: special marks (1).pdf pdf url：https://sign-dev.clinflash.com/api/view-pdf/51f311bef5f1acef012e52f46b233ab7-6edb1654addefc935e18fbd63344dea8.pdf The display is incomplete on the iOS platform, but there is no problem on Android. Version 1.0.55 was introduced.

espresso3389 commented 3 weeks ago

Your problem is just a font issue. Not a problem with iOS. Apparently, the PDF is not viewable on Chrome's PDF viewer on Windows:

Acrobat on Windows can show the PDF file by using font substitution (STSong-Light is substituted by AdobeSongStd-Light).

Currently, pdfrx does not have control on font substition and no workaround for it.

weiqingiqng commented 1 week ago

![Uploading Simulator Screenshot - iPhone 15 Pro Max - 2024-05-08 at 10.33.08.png…]()

Found that it can be fully displayed on the iOS simulator @espresso3389

espresso3389 commented 1 week ago

iOS simulator is a simulator; not an emulator. There are such kind of behavior differences.

On the simulator, it uses the preinstalled fonts on macOS, they are not found on iOS apparently.