public override void DrawImage(ITexture image, Rect rectangle, Point uvMin, Point uvMax)
{
if (image == null)
{
return;
}
EnsureContent();
unsafe
{
if (!this.content.ReadRecord(out DrawImageCommand record))
{//different record type: append new record
record.ImageSourceIndex = this.content.AddDependentResource(image);
record.rectangle = rectangle;
record.UVMin = uvMin;
record.UVMax = uvMax;
this.content.WriteRecord(RecordType.DrawImage, (byte *)&record, sizeof(DrawImageCommand));
return;
}
//same type: update record if different
bool recordNeedOverwrite = false;
if (this.content.ReadDependentResource(record.ImageSourceIndex, out ITexture oldImage))
{
if (!image.Equals(oldImage))
{
record.ImageSourceIndex = this.content.AddDependentResource(image);
recordNeedOverwrite = true;
}
}
else
{
record.ImageSourceIndex = this.content.AddDependentResource(image);
recordNeedOverwrite = true;
}
if (!Point.AlmostEqual(record.UVMin, uvMin))
{
record.UVMin = uvMin;
recordNeedOverwrite = true;
}
if (!Point.AlmostEqual(record.UVMax, uvMax))
{
record.UVMax = uvMax;
recordNeedOverwrite = true;
}
if (recordNeedOverwrite)
{
content.WriteRecord(RecordType.DrawImage, (byte *)&record, sizeof(DrawImageCommand));
}
}
}