private void ConvertToDiff_Click(object sender, System.EventArgs e)
{
if (FilesList.SelectedIndices.Count == 0)
{
return;
}
int firstIdx = FilesList.SelectedIndices[0];
Sprite firstSprite = (Sprite)SPack.Sprites[firstIdx];
foreach (int idx in FilesList.SelectedIndices)
{
if (idx <= 0)
{
continue;
}
Sprite sprite = (Sprite)SPack.Sprites[idx];
sprite.Subtract(ref firstSprite);
}
}
