46 lines
2.8 KiB
Markdown
46 lines
2.8 KiB
Markdown
# Developing PdfCraft
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Working instructions for agents and contributors are in `AGENTS.md` and `CLAUDE.md`. This page
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collects what the desktop app reads from its environment and where it writes its diagnostics.
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## Logs
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The desktop app writes its `log` records to standard error and to `logs/pdfcraft.log` in its
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settings folder, next to `app.ron`: Linux and FreeBSD `~/.local/share/pdfcraft/logs/` (or
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`$XDG_DATA_HOME/pdfcraft/logs/`), macOS `~/Library/Application Support/PdfCraft/logs/`, Windows
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`%APPDATA%\PdfCraft\data\logs\`. In portable mode (a `portable.txt` file next to the executable, as
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the Windows portable zip ships) the settings folder is `PdfCraftData\` beside the executable, and
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crash recovery and new digital IDs go there too. A start from a desktop menu, Finder or the Start
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menu has no terminal, so this file is what to attach to a bug report: a failed autosave, a page that
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would not render, a render worker that could not start and the report of an internal error all land
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there.
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Each launch moves the previous log to `pdfcraft.1.log` (and that one to `pdfcraft.2.log`), so the
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log of a run that crashed survives the next start. The file stops growing at 16 MiB. `--version`
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writes no file.
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By default PdfCraft's own crates (`pdfcraft*`) log at `info` and everything else at `warn`.
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`RUST_LOG` replaces that with env_logger-style directives, for example `RUST_LOG=debug`,
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`RUST_LOG=warn,pdfcraft_render=trace` or `RUST_LOG=info,wgpu_core=warn`; a directive ending in `*`
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covers every target starting with it (`pdfcraft*=debug`). The logger is
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`apps/pdfcraft/src/logging.rs`. It never records the control-channel token or document passwords.
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## GPU surface limits
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The desktop renderer enables the selected adapter's supported 2D texture extent, while keeping
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egui-wgpu's other device requirements. Restored windows on mixed-DPI monitors can exceed its
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default 8192-pixel extent even when the GPU supports a larger surface (#577). The enabled extent
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never exceeds the adapter's capability; this does not make surfaces larger than the hardware
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limit renderable.
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## Environment variables
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| Variable | Effect |
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| `RUST_LOG` | Log levels for standard error and the log file (see [Logs](#logs)) |
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| `RUST_BACKTRACE` | `1` adds a backtrace to the report of an internal error |
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| `XDG_DATA_HOME` | Linux/FreeBSD: base of the settings folder (`pdfcraft/`), the log folder and crash recovery |
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| `WGPU_POWER_PREF` | GPU choice; by default PdfCraft prefers the low-power (integrated) GPU |
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| `WGPU_BACKEND` | Graphics backend; by default Windows uses Direct3D 12, falling back to OpenGL |
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| `CRAFT_FONTS_DIR` | Build time: a [craft-fonts](https://github.com/storytold/craft-fonts) checkout to embed (Japanese fonts) |
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| `PDFCRAFT_SYSTEM_FONTS` | `0` stops the desktop app from using an installed font for characters its embedded fonts lack (`cargo xtask screenshots` sets it) |
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