ekklesiaandClaude Opus 5
8bed3d186a
UI_SCALE only ever reached the surfaces we draw ourselves. Chrome stayed tiny — its tabs, omnibox and menus are Chrome's own pixels, and Ctrl+ only scales page content, which is no use to a volunteer reading a toolbar from across the room. UI_SCALE is a property of the television, not of one program, so it now sets sway's output scale, which every client is measured against. classroom-scale runs first in the session and applies it. The display mode is untouched: the panel stays at 1920x1080 and only the logical coordinate space shrinks, which is what makes everything in it larger. Our own surfaces stop scaling themselves. They are measured in the same logical pixels sway is already scaling, so applying UI_SCALE again would double it. SHELL_SCALE is that decision in one named place, and setting it back to ui_scale(config) would restore per-surface scaling without touching a template. Measured at 1920x1080 with Chrome 152. Chrome's tab strip 40 -> 49 -> 59px against 1.0, 1.25, 1.5; sway's title bar 25 -> 31 -> 38px; the classroom dock 74 -> 92 -> 110px. Everything scales once, together, and 1.0 is identical to no scaling at all. Two tradeoffs, both measured rather than assumed. GTK 3 has no fractional scaling, so at 1.5 it renders at 2x and sway scales down — very slightly softer, invisible at classroom distance. XWayland is softer too: terminal text at 1.5 showed about 50% more intermediate-tone pixels than at 1.0. VLC is the only XWayland application here, and in DVD mode none of its interface is on screen, only video from a 720x480 disc that is being upscaled regardless. Chrome is a native Wayland client and stays sharp, which is what matters for reading. Co-Authored-By: Claude Opus 5 <[email protected]>
58 lines
1.6 KiB
Python
Executable File
58 lines
1.6 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Apply the room's UI scale to the whole classroom session.
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UI_SCALE is a property of the television, not of one program, so it is
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applied where it reaches everything: sway's output scale. Chrome's tabs
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and omnibox, its menus, VLC, and the classroom's own dock and
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notifications are then all measured in the same scaled logical pixels.
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The display mode is untouched — the panel stays at its native
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resolution. Only the logical coordinate space shrinks, which is what
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makes everything drawn in it larger.
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Run from the sway config before anything else starts, so surfaces come
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up at the right size rather than being resized underneath themselves.
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"""
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import os
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import subprocess
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import sys
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sys.path.insert(0, "/usr/local/lib/ekklesia-classroom")
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sys.path.insert(
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0,
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os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "lib"),
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)
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from classroom_config import read_device_config, ui_scale # noqa: E402
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def main():
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scale = ui_scale(read_device_config())
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try:
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result = subprocess.run(
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["swaymsg", "output", "*", "scale", f"{scale:g}"],
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capture_output=True,
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text=True,
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)
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except OSError as error:
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print(f"classroom-scale: {error}", file=sys.stderr)
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return 1
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if result.returncode != 0:
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print(
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f"classroom-scale: {result.stderr.strip() or 'sway refused the scale'}",
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file=sys.stderr,
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)
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return 1
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print(f"classroom-scale: session scale {scale:g}")
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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