public void SaveRegion(GeometryRegion saveMeRegion, Rectangle saveMeBounds)
{
var activeLayer = (BitmapLayer)ActiveLayer;
if (_savedTiles == null)
{
_savedTiles = new BitVector2D(
(activeLayer.Width + SaveTileGranularity - 1) / SaveTileGranularity,
(activeLayer.Height + SaveTileGranularity - 1) / SaveTileGranularity);
_savedTiles.Clear(false);
}
Rectangle regionBounds;
if (saveMeRegion == null)
{
regionBounds = saveMeBounds;
}
else
{
regionBounds = saveMeRegion.GetBoundsInt();
}
Rectangle bounds = Rectangle.Union(regionBounds, saveMeBounds);
bounds.Intersect(activeLayer.Bounds);
int leftTile = bounds.Left / SaveTileGranularity;
int topTile = bounds.Top / SaveTileGranularity;
int rightTile = (bounds.Right - 1) / SaveTileGranularity;
int bottomTile = (bounds.Bottom - 1) / SaveTileGranularity;
for (int tileY = topTile; tileY <= bottomTile; ++tileY)
{
Rectangle rowAccumBounds = Rectangle.Empty;
for (int tileX = leftTile; tileX <= rightTile; ++tileX)
{
if (!_savedTiles.Get(tileX, tileY))
{
Rectangle tileBounds = new Rectangle(tileX * SaveTileGranularity, tileY * SaveTileGranularity,
SaveTileGranularity, SaveTileGranularity);
tileBounds.Intersect(activeLayer.Bounds);
if (rowAccumBounds == Rectangle.Empty)
{
rowAccumBounds = tileBounds;
}
else
{
rowAccumBounds = Rectangle.Union(rowAccumBounds, tileBounds);
}
_savedTiles.Set(tileX, tileY, true);
}
else
{
if (rowAccumBounds != Rectangle.Empty)
{
using (Surface dst = ScratchSurface.CreateWindow(rowAccumBounds),
src = activeLayer.Surface.CreateWindow(rowAccumBounds))
{
dst.CopySurface(src);
}
rowAccumBounds = Rectangle.Empty;
}
}
}
if (rowAccumBounds != Rectangle.Empty)
{
using (Surface dst = ScratchSurface.CreateWindow(rowAccumBounds),
src = activeLayer.Surface.CreateWindow(rowAccumBounds))
{
dst.CopySurface(src);
}
rowAccumBounds = Rectangle.Empty;
}
}
if (this._saveRegion != null)
{
this._saveRegion.Dispose();
this._saveRegion = null;
}
if (saveMeRegion != null)
{
this._saveRegion = saveMeRegion.Clone();
}
}
