65 lines
1.8 KiB
Plaintext
65 lines
1.8 KiB
Plaintext
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#!env xonsh
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'''
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Compute the pxs-per-inch (PPI) naively for the local DE.
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NOTE, currently this only supports the `sway`-TWM on wayland.
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!TODO!
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- [ ] support Xorg (and possibly other OSs as well?
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- [ ] conver this to pure py code, dropping the `.xsh` specifics
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instead for `subprocess` API calls?
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- [ ] possibly unify all this with `./qt_screen_info.py` as part of
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a "PPI config wizard" or something, but more then likely we'll
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have lib-ified version inside modden/piker by then?
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'''
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import math
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import json
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# XXX, xonsh part using "subprocess mode"
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disp_infos: list[dict] = json.loads($(wlr-randr --json))
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lappy: dict = disp_infos[0]
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dims: dict[str, int] = lappy['physical_size']
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w_cm: int = dims['width']
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h_cm: int = dims['height']
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# cm per inch
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cpi: float = 25.4
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# compute "diagonal" size (aka hypot)
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diag_inches: float = math.sqrt((h_cm/cpi)**2 + (w_cm/cpi)**2)
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# compute reso-hypot / inches-hypot
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hi_res: dict[str, float|bool] = lappy['modes'][0]
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w_px: int = hi_res['width']
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h_px: int = hi_res['height']
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diag_pxs: float = math.sqrt(h_px**2 + w_px**2)
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unscaled_ppi: float = diag_pxs/diag_inches
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# retrieve TWM info on the display (including scaling info)
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sway_disp_info: dict = json.loads($(swaymsg -r -t get_outputs))[0]
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scale: float = sway_disp_info['scale']
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print(
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f'output: {sway_disp_info["name"]!r}\n'
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f'--- DIMENSIONS ---\n'
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f'w_cm: {w_cm!r}\n'
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f'h_cm: {h_cm!r}\n'
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f'w_px: {w_px!r}\n'
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f'h_cm: {h_px!r}\n'
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f'\n'
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f'--- DIAGONALS ---\n'
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f'diag_inches: {diag_inches!r}\n'
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f'diag_pxs: {diag_pxs!r}\n'
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f'\n'
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f'--- PPI-related-info ---\n'
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f'(DE reported) scale: {scale!r}\n'
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f'unscaled PPI: {unscaled_ppi!r}\n'
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f'|_ =sqrt(h_px**2 + w_px**2) / sqrt(h_in**2 + w_in**2)\n'
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f'scaled PPI: {unscaled_ppi/scale!r}\n'
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f'|_ =unscaled_ppi/scale\n'
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)
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