dtourolle and Claude Opus 5
e000068384
Cache word widths and glyph bitmaps to cut page render time ~3.5x
...
Rendering a page re-measured and re-rasterised the same words constantly: at
1404x1872 a page issued ~2800 textlength calls and ~2500 draw.text calls for
fewer than 1000 distinct (font, string) pairs. Profiling a page turn showed
FreeType glyph rendering at 57% of total time and width measurement at 38% of
layout.
Both are now cached. Measured on Crime and Punishment at 1404x1872, one page:
layout 35ms -> 19ms
render 84ms -> 41ms
total 120ms -> 60ms
Eviction ranks by use count rather than recency. Word frequency in prose is
Zipfian and stationary, so the words worth keeping are the ones used most, and
unlike recency this lets a document's own frequencies be seeded up front --
see prewarm_caches(). Two details keep the policy from costing more than it
saves, since get() runs once per word drawn:
- counting is O(1) with no reordering, because structures that reorder on
every hit measured 3-5ms/page slower than the hit rate they bought;
- eviction samples 8 entries and drops the least used of those, rather than
maintaining a global order.
Aging (halving all counts periodically) is on by default. Without it a font
size change drove the hit rate to 0% on a real access trace: every key was new
and the previous size's entries held counts nothing could beat.
Both caches are bounded, since the glyph bitmaps reach ~19MB over a long
session and the target is a 512MB Pi Zero 2. Defaults are 4MB of bitmaps and
8192 widths; configure_text_caches() tunes them. Cache size barely affects
speed (2MB is within 13% of unbounded) because a miss costs only one ~44us
rasterisation, so the bound can be set for memory, not throughput.
EreaderLayoutManager.prewarm_caches() counts the book's word frequencies and
preloads the most common ones, seeding each with its document frequency. This
moves that rasterisation to open time and cut misses by 27%, for ~15% faster
page turns at a one-off ~300ms cost. It is opt-in; nothing calls it yet.
Rendering is no longer bit-identical. PIL positions text at sub-pixel offsets,
so the cache buckets that phase, defaulting to 2 buckets per axis. Total ink
per page is unchanged and the mean pixel difference is 3.6/255 -- a fifth of
one step of a 16-level e-ink panel. subpixel_steps=4 halves that if wanted.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com >
2026-08-06 20:49:32 +02:00
dtourolle
2a543d0319
reduced redundant code
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2025-11-11 21:19:41 +01:00
dtourolle
23d3278b50
update docs and gitignore
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2025-11-11 18:19:49 +01:00
dtourolle
3bcd1bffb5
Tables now use ""dynamic page" allowing the contents to be anything that can be rendered ion a page.
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2025-11-11 18:10:47 +01:00
dtourolle
889f27e1a3
added fotn change API and examples
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2025-11-11 12:44:18 +01:00
dtourolle
9de67d958e
cell height now dynamic in tables
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2025-11-10 22:06:05 +01:00
dtourolle
41dc904755
fixed issue where last word was counted for spacing
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2025-11-10 15:22:18 +01:00
dtourolle
8e720d4037
fix table in cell wrapping
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2025-11-10 15:15:03 +01:00
dtourolle
5afad2ca07
added line wrapping to table
2025-11-10 14:33:30 +01:00
dtourolle
303179865d
tests for author names and metadata extraction
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2025-11-10 13:54:36 +01:00
dtourolle
fb52178cc6
fix for regresssion in fw/bw navigation
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2025-11-10 13:25:04 +01:00
dtourolle
890a0e768b
fix for reverse redering on restart
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2025-11-10 13:17:20 +01:00
dtourolle
a8e459bce5
fixed issue with cover and image rendering
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2025-11-10 13:06:21 +01:00
dtourolle
9fb6792e10
fix missing images in paras
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2025-11-09 22:25:23 +01:00
dtourolle
40c1b913ec
doc updates
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2025-11-09 22:06:42 +01:00
dtourolle
cc34c79495
more examples
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2025-11-09 21:40:59 +01:00
dtourolle
12ebddaa79
more examples
2025-11-09 21:40:50 +01:00
dtourolle
2b14517344
adding more fonts
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2025-11-09 21:17:26 +01:00
dtourolle
849ba2f60f
Added press state, fixed font registry
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2025-11-09 17:45:53 +01:00
dtourolle
9ae8ddddca
fixed example
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2025-11-09 17:21:17 +01:00
dtourolle
50b9aa5431
fixed issue with bounding box height being wrong
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2025-11-09 17:10:50 +01:00
dtourolle
56c2c21021
fix backwards rendering
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2025-11-09 15:56:00 +01:00
dtourolle
73700baf87
CI fix
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2025-11-09 09:16:10 +01:00
dtourolle
8b833eef0b
more fstring fixes
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2025-11-09 00:15:25 +01:00
dtourolle
78745c4e29
more fstring fixes
2025-11-09 00:15:07 +01:00
dtourolle
10612fefae
undoing more autoflake8 damage
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2025-11-09 00:11:48 +01:00
dtourolle
ce7293824e
fixing unterminated fsting
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2025-11-09 00:09:04 +01:00
dtourolle
8dce1569c0
fixed typo
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2025-11-09 00:05:14 +01:00
dtourolle
f070121e5c
bumpy version
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2025-11-08 23:59:53 +01:00
dtourolle
4c99282aef
setup cfg file
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2025-11-08 23:46:28 +01:00
dtourolle
781a9b6c08
auto flake and corrections
2025-11-08 23:46:15 +01:00
dtourolle
1ea870eef5
yet more tests
2025-11-08 19:52:19 +01:00
dtourolle
00314c9b4f
ADDITIOANL TEST
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2025-11-08 19:39:10 +01:00
dtourolle
af18b1794a
update readme
2025-11-08 19:25:32 +01:00
dtourolle
13d20c28c5
Api for changing sizes dynamically
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2025-11-08 18:22:58 +01:00
dtourolle
f8baf155e9
ereader manager tests
2025-11-08 12:59:57 +01:00
dtourolle
b65c35d96d
Add missing tests
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2025-11-08 12:43:39 +01:00
dtourolle
5c0b22569a
fix tests
2025-11-08 12:42:17 +01:00
dtourolle
39622c7dd7
integration of functional elements
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2025-11-08 10:17:01 +01:00
dtourolle
ea93681aaf
refactoring the mixin system
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2025-11-08 08:08:02 +01:00
dtourolle
49d4e551f8
Some clean up and added interactable images.
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2025-11-07 22:56:35 +01:00
dtourolle
15305011dc
moved gestures to application
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2025-11-07 22:18:24 +01:00
dtourolle
9bc9c96e14
clean up examples
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2025-11-07 21:35:43 +01:00
dtourolle
496f3bf334
end2end table layouter
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2025-11-07 21:13:01 +01:00
dtourolle
5fe4db4cbe
more refactoring
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2025-11-07 20:34:28 +01:00
dtourolle
03918fc716
complete the table rendering
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2025-11-07 19:45:47 +01:00
dtourolle
b1553f1628
refactor continues
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2025-11-07 19:26:32 +01:00
dtourolle
f72c6015c6
more reorg
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2025-11-07 19:14:37 +01:00
dtourolle
33e2cbc363
remove application from library
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2025-11-07 18:48:36 +01:00
dtourolle
6bb43db8d5
fix examples
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2025-11-06 18:01:22 +01:00
dtourolleandClaude Opus 5