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docs(webui): update the compression numbers for the merged bundle

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The bundle merge brings the Web UI to 28,200 bytes gzip (25.3 % of the
raw 111,280); the table of embedded files now has 18 entries.
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eraiza0816 committed 2026-08-11 05:40:58 +09:00
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doc/webui-compression.md
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@@ -17,7 +17,12 @@ html/ --(minify.py)--> output/html_min/ --(fileadder -z)--> flash image
for development; the minified copy in `output/` is a pure build for development; the minified copy in `output/` is a pure build
artifact. Comments and indentation are pure overhead for the served artifact. Comments and indentation are pure overhead for the served
bytes, so minification alone already reduces the transfer size from bytes, so minification alone already reduces the transfer size from
113,015 to 101,498 bytes, independent of gzip. 111,280 to 99,715 bytes, independent of gzip.
- The per-page scripts are consolidated into a single `html/main.js`
bundle (i18n, shared helpers, navigation and the page scripts). Every
page loads only this one script, so the browser fetches it once and
gzip can compress across all of it. The page-specific initialisation
runs only when the matching page elements are present.
- `fileadder -z` gzip-compresses every file (zlib, gzip format, - `fileadder -z` gzip-compresses every file (zlib, gzip format,
`Z_BEST_COMPRESSION`) when it generates the file table `Z_BEST_COMPRESSION`) when it generates the file table
(`html_data.c`/`html_data.h`) and when it embeds the files into the (`html_data.c`/`html_data.h`) and when it embeds the files into the
@@ -36,21 +41,27 @@ Build on any machine (the Web UI is machine-independent):
| | bytes | | | bytes |
|---|---:| |---|---:|
| raw sources | 113,015 | | raw sources | 111,280 |
| minified (comments and indentation removed) | 101,498 | | minified (comments and indentation removed) | 99,715 |
| gzip (flash + wire) | 34,784 (30.8 %) | | gzip (flash + wire) | 28,200 (25.3 %) |
The minified assets are also what the browser receives when gzip support The minified assets are also what the browser receives when gzip support
is missing or disabled, so the transfer size drops in both stages: is missing or disabled, so the transfer size drops in both stages:
113,015 → 101,498 bytes from minification, then → 34,784 bytes from gzip. 111,280 → 99,715 bytes from minification, then → 28,200 bytes from gzip.
The embedded data block ends at `0x5b977` without compression and at The embedded data block ends at `0x5b977` without compression and at
`0x487e0` with it, freeing ~78 KB of the 512 KB image. `0x46e28` with it, freeing ~83 KB of the 512 KB image.
Merging the JS files into one bundle is worth more than the minifier and
gzip combined: served per file, the 17 scripts gzip to 23,302 bytes; as
one `main.js` bundle they gzip to 16,948 bytes, because the gzip
dictionary spans all scripts and every page fetches the bundle only
once.
## Notes ## Notes
- The files stay well below the `uint16_t` size limit of the file table - The files stay well below the `uint16_t` size limit of the file table
(largest gzip output: 5.4 KB for `i18n.js`). (largest gzip output: 16.9 KB for the merged `main.js`).
- `fileadder` terminates the embedded files with a NUL directly after the - `fileadder` terminates the embedded files with a NUL directly after the
content (previously at `data_read + 1`), so the `strlen()`-based size content (previously at `data_read + 1`), so the `strlen()`-based size
computation no longer depends on uninitialised buffer content. computation no longer depends on uninitialised buffer content.