Files
qelectrotech-source-mirror/sources
ispyisail 1ad3c8e2b2 Speed up opening .qetz projects with large pictures
A .qetz keeps each folio picture as a PNG file. On opening, join() put
every picture back into the document as base64 text, and the folio then
decoded that text again, twice. On a project with 20 pictures of 7 MB
(140 MB of PNG, the shape of the project on PR #1462) that cost about
8 of the 12 seconds the open took:

  QDomDocument::createTextNode() on the base64   3.9 s
  DiagramImageItem::fromXml(), base64 decoded    3.9 s (2 x 1.9 s)
  the PNG decoding itself                        0.3 s

join() now takes an optional map. Given one, each picture stays a file:
the <image> keeps its qetz-file attribute and the bytes go in the map.
QETProject keeps the map for as long as the project is open, and
Diagram::fromXml() hands a picture's bytes to the new
DiagramImageItem::fromXml(element, picture). Kept, not cleared after
the load, so a folio built later finds its pictures too; the bytes are
shared with the PNG cache of the pictures built from them, so this costs
almost no memory. readDocument() without a map, as the automatic
numbering import uses it, still gives the whole document.

fromXml() of a .qet picture also decodes its base64 once instead of
twice: the first text node, which the PNG cache already used. e.text()
also collects <image_base>'s text, but loadFromData() stops at the end
of the first picture, so the picture shown is the same.

Measured, same file, 3 runs each, offscreen:
  .qetz  11.8 s -> 3.8 s, peak memory 1034 MB -> 655 MB
  .qet   15.7 s -> 13.6 s
Resaving either file with either binary gives the same bytes, a cropped
and colour-keyed picture included, and every folio exports to the same
PNG pixels.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-13 23:02:47 +13:00
..
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-10-03 18:09:33 +02:00
2026-01-16 15:24:35 +01:00
2026-04-26 10:48:47 +02:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-10-12 16:02:26 +02:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-07-17 10:29:13 +02:00
2026-07-17 10:29:13 +02:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00
2026-01-16 15:24:35 +01:00