public RectInt32 GetDefaultDifferentialMaxBounds(TChanges oldChanges, TChanges newChanges)
{
if (oldChanges.Equals((ReferenceValue)newChanges))
{
return(new RectInt32(newChanges.GetMaxRenderBounds().Location, SizeInt32.Zero));
}
RectInt32 maxRenderBounds = oldChanges.GetMaxRenderBounds();
RectInt32 b = newChanges.GetMaxRenderBounds();
return(RectInt32.Union(maxRenderBounds, b));
}
private void UpdateLayerOverlay()
{
this.tool.VerifyAccess <TTool>();
using (this.updateLayerOverlayRegion.UseEnterScope())
{
TChanges local;
RectInt32?nullable;
RectInt32?nullable2;
RectInt32?nullable3;
RectInt32?nullable4;
BitmapLayerToolLayerOverlay <TTool, TChanges> overlay2;
RectInt32 differentialMaxBounds;
RectInt32 num3;
BitmapLayerToolLayerOverlay <TTool, TChanges> layerOverlay = this.layerOverlay;
if (layerOverlay == null)
{
local = default(TChanges);
nullable = null;
nullable2 = null;
}
else
{
local = layerOverlay.Changes;
nullable = new RectInt32?(local.GetMaxRenderBounds());
nullable2 = new RectInt32?(layerOverlay.AffectedBounds);
}
TChanges changes = this.tool.Changes;
if (changes == null)
{
nullable3 = null;
nullable4 = null;
overlay2 = null;
}
else
{
nullable3 = new RectInt32?(changes.GetMaxRenderBounds());
overlay2 = this.CreateLayerOverlay(this.tool.ActiveLayer, changes);
if (overlay2 == null)
{
ExceptionUtil.ThrowInternalErrorException("CreateLayerOverlay() -> null");
}
nullable4 = new RectInt32?(overlay2.AffectedBounds);
}
RectInt32 num = this.tool.Document.Bounds();
if ((local == null) && (changes != null))
{
differentialMaxBounds = nullable3.Value;
num3 = nullable4.Value;
}
else if ((local != null) && (changes == null))
{
differentialMaxBounds = nullable.Value;
num3 = nullable2.Value;
}
else
{
differentialMaxBounds = this.tool.GetDifferentialMaxBounds(local, changes);
num3 = RectInt32.Union(nullable2.Value, nullable4.Value);
}
RectInt32 num4 = RectInt32.Intersect(differentialMaxBounds, num3);
this.layerOverlay = overlay2;
this.tool.DocumentCanvas.ReplaceLayerOverlay(this.tool.ActiveLayer, layerOverlay, overlay2, new RectInt32?(num4));
}
}