public void BuildDirtyRect(ref int x, int y, out int XStart, out int YStart, out int XEnd, out int YEnd)
{
int LastX = this.numCellsX - x;
DirtyCell curCell = GetCell(x, y);
XStart = (x << GetXCellFactor()) + curCell.coverage.Left;
YStart = (y << GetYCellFactor()) + curCell.coverage.Bottom;
XEnd = (x << GetXCellFactor()) + curCell.coverage.Right;
YEnd = (y << GetYCellFactor()) + curCell.coverage.Top;
int XCellSize = GetXCellSize();
DirtyCell nextCell = GetCell(x + 1, y);
if (curCell.coverage.Right == (int)XCellSize && // it touches the right side of the cell
nextCell != null && nextCell.isDirty && // there is a next cell
nextCell.coverage.Left == 0 && // that touches the left
curCell.coverage.Top == nextCell.coverage.Top && // and they have the same top
curCell.coverage.Bottom == nextCell.coverage.Bottom) // and bottom
{
// get all the ones we can (build a nice big strip rather than every rect)
while (x + 1 < LastX &&
curCell.coverage.Right == (int)XCellSize && // it touches the right side of the cell
nextCell != null && nextCell.isDirty && // there is a next cell
nextCell.coverage.Left == 0 && // that touches the left
curCell.coverage.Top == nextCell.coverage.Top && // and they have the same top
curCell.coverage.Bottom == nextCell.coverage.Bottom) // and bottom
{
x++;
XEnd += nextCell.coverage.Width;
curCell = nextCell;
nextCell = GetCell(x + 1, y);
}
}
}
public void SetDirty(RectangleInt areaToSetDirty)
{
if (areaToSetDirty.Left >= areaToSetDirty.Right || areaToSetDirty.Bottom >= areaToSetDirty.Top)
{
return;
}
RectangleInt BoundRect = new RectangleInt(0, 0, numCellsX << xCellFactor, numCellsY << yCellFactor);
RectangleInt Area = areaToSetDirty;
if (Area.IntersectWithRectangle(BoundRect))
{
Area.Right--;
Area.Top--;
Area.Left = Area.Left >> xCellFactor;
Area.Right = Area.Right >> xCellFactor;
Area.Bottom = Area.Bottom >> yCellFactor;
Area.Top = Area.Top >> yCellFactor;
int offsetForY = yTable[Area.Bottom];
for (int y = Area.Bottom; y <= Area.Top; y++)
{
for (int x = Area.Left; x <= Area.Right; x++)
{
DirtyCell currCell = dirtyCells[offsetForY + x];
// if it's not set or it's not totally covered
RectangleInt CurCellBounds = new RectangleInt((x << xCellFactor), (y << yCellFactor),
((x << xCellFactor) + xCellSize), ((y << yCellFactor) + yCellSize));
// if we are setting it for the first time
if (!currCell.isDirty)
{
currCell.coverage.Left = Math.Max(Math.Min((areaToSetDirty.Left - CurCellBounds.Left), xCellSize), 0);
currCell.coverage.Bottom = Math.Max(Math.Min((areaToSetDirty.Bottom - CurCellBounds.Bottom), yCellSize), 0);
currCell.coverage.Right = Math.Max(Math.Min((areaToSetDirty.Right - CurCellBounds.Left), xCellSize), 0);
currCell.coverage.Top = Math.Max(Math.Min((areaToSetDirty.Top - CurCellBounds.Bottom), yCellSize), 0);
}
else // we are adding to it's coverage
{
currCell.coverage.Left = Math.Max(Math.Min(Math.Min(currCell.coverage.Left, (areaToSetDirty.Left - CurCellBounds.Left)), xCellSize), 0);
currCell.coverage.Bottom = Math.Max(Math.Min(Math.Min(currCell.coverage.Bottom, (areaToSetDirty.Bottom - CurCellBounds.Bottom)), yCellSize), 0);
currCell.coverage.Right = Math.Max(Math.Min(Math.Max(currCell.coverage.Right, (areaToSetDirty.Right - CurCellBounds.Left)), xCellSize), 0);
currCell.coverage.Top = Math.Max(Math.Min(Math.Max(currCell.coverage.Top, (areaToSetDirty.Top - CurCellBounds.Bottom)), yCellSize), 0);
}
currCell.isDirty = true;
}
offsetForY += numCellsX;
}
}
}
