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Use multiple drawing workers for image_with_options rendering #2386

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Use multiple drawing workers for image_with_options rendering #2386

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4 changes: 3 additions & 1 deletion src/laybasic/laybasic/layLayoutCanvas.cc
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Expand Up @@ -855,7 +855,9 @@ LayoutCanvas::image_with_options (unsigned int width, unsigned int height, int l
lay::RedrawThread redraw_thread (&rd_canvas, mp_view);

// render the layout
redraw_thread.start (0 /*synchronous*/, m_layers, vp, resolution, font_resolution, true);
int workers = mp_view->synchronous () ? 0 : mp_view->drawing_workers ();
redraw_thread.start (workers, m_layers, vp, resolution, font_resolution, true);
redraw_thread.wait ();
redraw_thread.stop (); // safety

// paint the background objects. It uses "img" to paint on.
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