Connected to previous image handling updates: images were not exported at all to dxf. In this

update instead of the image a placeholder box is drawn and a warning is given during export.

Current dxf version is extremely old and does not support any image embedding. Future possible
update is the introduction of a newer dxf version export option which would allow to embed a link to an external
image file.

sources/dxfpaintdevice.cpp

@@ -200,18 +200,35 @@ void DxfPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)
 
 /**
 	@brief DxfPaintEngine::drawPixmap
-	Not implemented in v1 - out of scope per the design note in the
+	No DXF dialect this old (AC1006, AutoCAD R10 from 1988) has any
-	header (CrossRefItem, the only item exported through this engine so
+	raster image representation at all -- IMAGE/IMAGEDEF wasn't
-	far, never draws a pixmap). qWarning() rather than a hard failure, so
+	introduced until R2000, over a decade later, and even there the
-	an item that does call this in the future degrades to "one entity
+	pixels are never embedded, only referenced by external file path.
-	missing" instead of crashing the whole export.
+	Actually supporting images means upgrading the DXF version target
+	and managing a second file alongside the DXF; until then, this
+	draws a placeholder rectangle outline (the item's own destination
+	rect, mapped through m_world_transform exactly like drawRects()
+	does) instead of silently dropping the item -- so its position,
+	size, rotation, and skew all survive the export even though the
+	picture itself can't yet. A fixed, plain pen, not m_pen: an image
+	item has no meaningful pen of its own for this engine to have
+	picked up from a prior updateState().
 */
 void DxfPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr)
 {
-	Q_UNUSED(r)
 	Q_UNUSED(pm)
 	Q_UNUSED(sr)
-	qWarning() << "DxfPaintEngine::drawPixmap: not supported, entity skipped";
+
+	QPolygonF corners;
+	corners << r.topLeft() << r.topRight() << r.bottomRight() << r.bottomLeft();
+
+	QPolygonF mapped;
+	mapped.reserve(corners.size() + 1);
+	for (const QPointF &p : corners)
+		mapped << toDxf(p);
+	mapped << mapped.first();
+
+	Createdxf::drawPolyline(m_filepath, mapped, Createdxf::dxfColor(QPen(Qt::black)));
 }
 
 /**
@@ -261,8 +278,21 @@ int DxfPaintDevice::metric(PaintDeviceMetric metric) const
 		case PdmDepth:
 			return 24;
 		case PdmDevicePixelRatio:
-		case PdmDevicePixelRatioScaled:
 			return 1;
+		case PdmDevicePixelRatioScaled:
+			// Not just 1: Qt's own convention (see QPaintDevice's docs)
+			// is that this metric equals PdmDevicePixelRatio scaled by
+			// devicePixelRatioFScale() -- a large constant (65536)
+			// used internally for sub-integer precision. Returning the
+			// plain, unscaled ratio here (as this used to) meant
+			// QPainter's own transform bookkeeping divided by it
+			// expecting the scaled value, silently shrinking every
+			// drawPixmap() destination rect by a factor of 65536 --
+			// this is what was actually behind the placeholder
+			// rectangle rendering at a barely-visible fraction of its
+			// real size instead of the size the item's own
+			// sceneTransform() correctly specified.
+			return int(1 * QPaintDevice::devicePixelRatioFScale());
 		default:
 			return 0;
 	}

sources/dxfpaintdevice.h

@@ -56,11 +56,18 @@
 	  - fillPath       -> same outline-only handling as drawRects; no HATCH
 	                       support in v1 (see design note in the PR)
 
-	Anything outside this list (images, gradients, etc.) is intentionally
+	  - drawPixmap     -> no raster image entity exists in this DXF
-	unimplemented and asserts in debug builds rather than silently
+	                       dialect at all (see drawPixmap()'s own
-	producing an incomplete drawing - callers should know immediately if
+	                       comment) -- draws a placeholder rectangle
-	an item they're exporting uses something this engine doesn't cover
+	                       outline instead, preserving the item's
-	yet, rather than getting a DXF file quietly missing content.
+	                       position/size/rotation/skew even though the
+	                       picture itself can't be included yet
+
+	Anything else outside this list (gradients, etc.) is intentionally
+	unimplemented and logs a warning rather than silently producing an
+	incomplete drawing - callers should know immediately if an item
+	they're exporting uses something this engine doesn't cover yet,
+	rather than getting a DXF file quietly missing content.
 */
 class DxfPaintEngine : public QPaintEngine
 {

sources/exportdialog.cpp

@@ -744,6 +744,25 @@ void ExportDialog::generateDxf(
 		painter.end();
 	}
 
+	//Draw images -- collected above (list_images) but never actually
+	//drawn until now, an existing gap this reuses the same paint()
+	//-replay approach to fix: DiagramImageItem::paint() has no
+	//viewport-dependent logic (unlike CrossRefItem, which needs its own
+	//paintForExport() for that reason), so it's called directly with a
+	//default QStyleOptionGraphicsItem rather than needing an export-
+	//specific variant of its own. DxfPaintEngine::drawPixmap() is what
+	//actually turns the drawPixmap() call inside paint() into a
+	//placeholder outline, since this DXF dialect has no raster image
+	//entity to draw instead.
+	for (DiagramImageItem *image : std::as_const(list_images))
+	{
+		DxfPaintDevice dxf_device(file_path);
+		QPainter painter(&dxf_device);
+		painter.setWorldTransform(image->sceneTransform());
+		image->paintForExport(&painter);
+		painter.end();
+	}
+
 	Createdxf::dxfEnd(file_path);
 
 	saveReloadDiagramParameters(diagram, false);
@@ -818,6 +837,42 @@ void ExportDialog::slot_export()
 		return;
 	}
 	
+	// Warn once, up front, rather than per-diagram: this DXF dialect
+	// (AC1006, AutoCAD R10) has no raster image representation at all
+	// (IMAGE/IMAGEDEF wasn't introduced until R2000, over a decade
+	// later, and even there the picture is never embedded, only
+	// referenced by external file path) -- so any image ends up as a
+	// placeholder rectangle outline instead (see DxfPaintEngine::
+	// drawPixmap()), with its position/size/rotation/skew preserved but
+	// not its actual content.
+	if (epw -> exportProperties().format.compare(QLatin1String("dxf"), Qt::CaseInsensitive) == 0)
+	{
+		bool any_images = false;
+		for (ExportDiagramLine *diagram_line : std::as_const(diagrams_to_export))
+		{
+			for (QGraphicsItem *item : diagram_line->diagram->items())
+			{
+				if (qgraphicsitem_cast<DiagramImageItem *>(item)) {
+					any_images = true;
+					break;
+				}
+			}
+			if (any_images) break;
+		}
+
+		if (any_images)
+		{
+			QET::QetMessageBox::warning(
+				this,
+				tr("Images non incluses dans l'export DXF", "message box title"),
+				tr("Le format DXF utilisé ici (AC1006) ne permet pas d'inclure d'image. "
+				   "Les images seront représentées uniquement par un rectangle de contour "
+				   "(position, taille, rotation et inclinaison conservées), sans le contenu de l'image.",
+				   "message box content")
+			);
+		}
+	}
+	
 	// exporte chaque schema a exporter
 	foreach(ExportDiagramLine *diagram_line, diagrams_to_export) {
 		exportDiagram(diagram_line);

sources/qetgraphicsitem/diagramimageitem.h

@@ -24,6 +24,7 @@
 
 #include <QColor>
 #include <QList>
+#include <QStyleOptionGraphicsItem>
 #include <QVector>
 
 class QDomElement;
@@ -96,6 +97,19 @@ class DiagramImageItem : public QetGraphicsItem {
 	QRectF boundingRect() const override;
 	QString name() const override;
 
+	/// DXF export: replay this item's paint() on an arbitrary QPainter
+	/// (e.g. one targeting DxfPaintDevice). paint() itself stays
+	/// protected, as it should for the normal
+	/// QGraphicsScene/QGraphicsView paint contract - this is a
+	/// deliberate, narrow escape hatch for exporters, not a general
+	/// relaxation of that contract. Matches CrossRefItem::paintForExport()
+	/// exactly, for the identical reason.
+	void paintForExport(QPainter *painter)
+	{
+		QStyleOptionGraphicsItem option;
+		paint(painter, &option, nullptr);
+	}
+
 	qreal scaleFactorX() const { return m_transform.scaleX; }
 	qreal scaleFactorY() const { return m_transform.scaleY; }
 	void setScaleFactorX(qreal factor);