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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
Download Patch File Download Diff File Expand all files Collapse all files
sources/exportpropertieswidget.cpp
+11
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@@ -68,6 +68,7 @@ ExportProperties ExportPropertiesWidget::exportProperties() const
export_properties.draw_colored_conductors = draw_colored_conductors -> isChecked();
export_properties.dxf_blocks = dxf_blocks -> isChecked();
export_properties.dxf_attributes = dxf_attributes -> isChecked();
export_properties.svg_small_pictures = svg_small_pictures -> isChecked();
export_properties.exported_area = export_border -> isChecked() ? QET::BorderArea : QET::ElementsArea;
return(export_properties);
@@ -94,6 +95,7 @@ void ExportPropertiesWidget::setExportProperties(const ExportProperties &export_
dxf_blocks -> setChecked(export_properties.dxf_blocks);
dxf_attributes -> setChecked(export_properties.dxf_attributes);
dxf_attributes -> setEnabled(export_properties.dxf_blocks);
svg_small_pictures -> setChecked(export_properties.svg_small_pictures);
if (export_properties.exported_area == QET::BorderArea) {
export_border -> setChecked(true);
@@ -125,6 +127,7 @@ void ExportPropertiesWidget::setPrintingMode(bool mode) {
export_border -> setVisible(!mode);
export_elements -> setVisible(!mode);
draw_bg_transparent -> setVisible(!mode);
svg_small_pictures -> setVisible(!mode);
}
/**
@@ -235,6 +238,11 @@ void ExportPropertiesWidget::build()
dxf_attributes -> setToolTip(tr("A symbol's texts (label, function...) become attributes of its block. LibreCAD does not show attributes."));
optionshlayout -> addWidget(dxf_attributes, 5, 1);
connect(dxf_blocks, &QCheckBox::toggled, dxf_attributes, &QCheckBox::setEnabled);
// pictures not at full resolution in an SVG: a much smaller file
svg_small_pictures = new QCheckBox(tr("SVG: smaller pictures"), groupbox_options);
svg_small_pictures -> setToolTip(tr("Pictures are stored at four times the size they have on the folio instead of their full resolution: a much smaller file, still sharp when printed"));
optionshlayout -> addWidget(svg_small_pictures, 5, 0);
vboxLayout -> addWidget(groupbox_options);
@@ -252,6 +260,7 @@ void ExportPropertiesWidget::build()
setTabOrder(draw_colored_conductors, draw_bg_transparent);
setTabOrder(draw_bg_transparent, dxf_blocks);
setTabOrder(dxf_blocks, dxf_attributes);
setTabOrder(draw_bg_transparent, svg_small_pictures);
// connexion du bouton permettant le choix du repertoire
connect(button_browse, &QPushButton::released, this, &ExportPropertiesWidget::slot_chooseADirectory);
@@ -269,6 +278,7 @@ void ExportPropertiesWidget::build()
connect(draw_colored_conductors, &QCheckBox::stateChanged, this, &ExportPropertiesWidget::optionChanged);
connect(dxf_blocks, &QCheckBox::stateChanged, this, &ExportPropertiesWidget::optionChanged);
connect(dxf_attributes, &QCheckBox::stateChanged, this, &ExportPropertiesWidget::optionChanged);
connect(svg_small_pictures, &QCheckBox::stateChanged, this, &ExportPropertiesWidget::optionChanged);
#else
connect(draw_grid, &QCheckBox::checkStateChanged, this, &ExportPropertiesWidget::optionChanged);
connect(draw_border, &QCheckBox::checkStateChanged, this, &ExportPropertiesWidget::optionChanged);
@@ -279,5 +289,6 @@ void ExportPropertiesWidget::build()
connect(draw_colored_conductors, &QCheckBox::checkStateChanged, this, &ExportPropertiesWidget::optionChanged);
connect(dxf_blocks, &QCheckBox::checkStateChanged, this, &ExportPropertiesWidget::optionChanged);
connect(dxf_attributes, &QCheckBox::checkStateChanged, this, &ExportPropertiesWidget::optionChanged);
connect(svg_small_pictures, &QCheckBox::checkStateChanged, this, &ExportPropertiesWidget::optionChanged);
#endif
}