tdf#157164 Vertical Position preview does not show red line for baseline

regression from
    commit f510ea2d7962a4325055c6380a0032331b4e87cf
    Author: Noel Grandin <noel.grandin@collabora.co.uk>
    Date:   Wed Jan 12 11:49:35 2022 +0200
    don't bother trying to draw stuff which is effectively invisible

Change-Id: Idc947163521ebfb65b27204fb5c65b1f59fe6de3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/157481
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 10 insertions, 5 deletions

diff --git a/vcl/headless/CairoCommon.cxx b/vcl/headless/CairoCommon.cxx
index 954e29a2026d..abd024293314 100644
--- a/vcl/headless/CairoCommon.cxx
+++ b/vcl/headless/CairoCommon.cxx
@@ -886,11 +886,16 @@ void CairoCommon::drawPolyPolygon(const basegfx::B2DHomMatrix& rObjectToDevice,
         return;
     }
 
-    // don't bother trying to draw stuff which is effectively invisible
-    basegfx::B2DRange aPolygonRange = rPolyPolygon.getB2DRange();
-    aPolygonRange.transform(rObjectToDevice);
-    if (aPolygonRange.getWidth() < 0.1 || aPolygonRange.getHeight() < 0.1)
-        return;
+    if (!bHasLine)
+    {
+        // don't bother trying to draw stuff which is effectively invisible, speeds up
+        // drawing some complex drawings. This optimisation is not valid when we do
+        // the pixel offset thing (i.e. bHasLine)
+        basegfx::B2DRange aPolygonRange = rPolyPolygon.getB2DRange();
+        aPolygonRange.transform(rObjectToDevice);
+        if (aPolygonRange.getWidth() < 0.1 || aPolygonRange.getHeight() < 0.1)
+            return;
+    }
 
     cairo_t* cr = getCairoContext(true, bAntiAlias);
     if (cairo_status(cr) != CAIRO_STATUS_SUCCESS)