public override void DrawRectangle(Brush brush, Pen pen, Rect rectangle)
{
if (brush == null && pen == null)
{
return;
}
unsafe
{
EnsureContent();
if (!this.content.ReadRecord(out DrawRectangleCommand record))
{//different record type: append new record
record.BrushIndex = this.content.AddDependentResource(brush);
record.PenIndex = this.content.AddDependentResource(pen);
record.Rectangle = rectangle;
this.content.WriteRecord(RecordType.DrawRectangle, (byte *)&record, sizeof(DrawRectangleCommand));
return;
}
//same type: update record if different
bool recordNeedOverwrite = false;
if (!Rect.AlmostEqual(record.Rectangle, rectangle))
{
record.Rectangle = rectangle;
recordNeedOverwrite = true;
}
if (this.content.ReadDependentResource(record.PenIndex, out Pen oldPen))
{
if (!oldPen.Equals(pen))
{
record.PenIndex = this.content.AddDependentResource(pen);
recordNeedOverwrite = true;
}
}
else
{
record.PenIndex = this.content.AddDependentResource(pen);
recordNeedOverwrite = true;
}
if (this.content.ReadDependentResource(record.BrushIndex, out Brush oldBrush))
{
if (!oldBrush.Equals(brush))
{
record.BrushIndex = this.content.AddDependentResource(brush);
recordNeedOverwrite = true;
}
}
else
{
record.BrushIndex = this.content.AddDependentResource(brush);
recordNeedOverwrite = true;
}
if (recordNeedOverwrite)
{
content.WriteRecord(RecordType.DrawRectangle, (byte *)&record, sizeof(DrawRectangleCommand));
}
}
}
