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Add an SVG export option to store pictures smaller

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An SVG keeps every picture at full resolution, whatever size it is
drawn at: a folio with 22 phone photos shown at a tenth of their size
gave a 270 MB SVG and took 65 s to write, most of it compressing the
photos again.

The export dialog gets "SVG: smaller pictures" (off by default, kept
with the other export settings), and --export-svg gets
--svg-small-pictures. With it, a picture is stored at four times the
size it is drawn at when that is smaller than the picture; smaller
pictures stay whole. Four times is about 375 dpi on a printed folio.

The exporter sets Diagram::smallPictures() for its own drawing only,
so screen, print, PDF and PNG are unchanged. It is not part of
applyProperties(), which every format uses.

On that project: --export-svg 84.9 s -> 34.5 s (opening is 20 s of
both), 270 MB -> 57 MB, peak memory 2.45 -> 1.86 GB. Rendered at twice
the folio size, the two SVGs differ by more than 32/255 on 0.23 % of
pixels, along photo detail.

tst_svgsmallpictures: an 800x600 picture drawn at 0.1 is stored at
320x240 with the option, through --export-svg and through the
dialog's QPicture route, and at 800x600 without it; a 40x30 picture
stays whole. It fails when the factor is changed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
ispyisail
2026-10-14 13:12:38 +13:00
parent 8b680af938
commit da6eb83035
12 changed files with 252 additions and 4 deletions
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sources/cli_export.h
+4 -1
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@@ -44,7 +44,7 @@ namespace CLIExport {
Usage:
qelectrotech --export-pdf <project.qet> <output.pdf> [--show-terminals]
qelectrotech --export-png <project.qet> <output_dir> [--show-terminals]
qelectrotech --export-svg <project.qet> <output_dir> [--show-terminals]
qelectrotech --export-svg <project.qet> <output_dir> [--show-terminals] [--svg-small-pictures]
qelectrotech --export-dxf <project.qet> <output_dir> [--show-terminals] [--dxf-blocks] [--dxf-attributes]
qelectrotech --export-cables <project.qet> <output.csv>
qelectrotech --export-wires <project.qet> <output.csv>
@@ -71,6 +71,9 @@ namespace CLIExport {
--dxf-attributes: as --dxf-blocks, and a symbol's texts (its label,
function...) are attributes of its INSERT. LibreCAD does not
show attributes.
--svg-small-pictures: in an SVG, each picture at most four times the
size it is drawn at instead of its full resolution: a much
smaller file, still sharp when printed.
cables: wiring list (one row per conductor) as CSV.
wires: list of distinct wire numbers as CSV.
bom: bill of materials (one row per element) as CSV.