Provide a toggle in the document properties to optionally turn off

antialiasing for display and export.
Fixes a nearly 10 year old bug #170356

Fixed bugs:
  - https://launchpad.net/bugs/170356

(bzr r13144)

1 files changed, 17 insertions, 0 deletions

diff --git a/src/display/drawing-group.cpp b/src/display/drawing-group.cpp
index 38ace001f..c03e0f3ba 100644
--- a/src/display/drawing-group.cpp
+++ b/src/display/drawing-group.cpp
@@ -22,6 +22,7 @@ DrawingGroup::DrawingGroup(Drawing &drawing)
     : DrawingItem(drawing)
     , _style(NULL)
     , _child_transform(NULL)
+    , _uses_antialiasing(true)
 {}
 
 DrawingGroup::~DrawingGroup()
@@ -47,6 +48,15 @@ DrawingGroup::setStyle(SPStyle *style)
     _setStyleCommon(_style, style);
 }
 
+void
+DrawingGroup::setAntialiasing(bool a)
+{
+    if (_uses_antialiasing != a) {
+        _uses_antialiasing = a;
+        _markForUpdate(STATE_ALL, true);
+    }
+}
+
 /**
  * Set additional transform for the group.
  * This is applied after the normal transform and mainly useful for
@@ -100,6 +110,13 @@ DrawingGroup::_updateItem(Geom::IntRect const &area, UpdateContext const &ctx, u
 unsigned
 DrawingGroup::_renderItem(DrawingContext &dc, Geom::IntRect const &area, unsigned flags, DrawingItem *stop_at)
 {
+    DrawingContext::Save aa_save;
+
+    if (!_uses_antialiasing) {
+        aa_save.save(dc);
+        cairo_set_antialias(dc.raw(), CAIRO_ANTIALIAS_NONE);
+    }
+        
     if (stop_at == NULL) {
         // normal rendering
         for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {