public Region(ScratchBuffer sb, Graphics graphics, Rectangle region)
{
var minWidth = (int)Math.Ceiling(region.Width / 16.0f) * 16;
var minHeight = (int)Math.Ceiling(region.Height / 16.0f) * 16;
var needNewBitmap =
(sb._ScratchBuffer == null) || (sb._ScratchBuffer.Width < minWidth) ||
(sb._ScratchBuffer.Height < minHeight);
if (needNewBitmap && sb._ScratchBuffer != null)
{
DeleteObject(sb._ScratchHDC);
DeleteObject(sb._ScratchHBitmap);
sb._ScratchBuffer.Dispose();
}
if (needNewBitmap && sb._ScratchGraphics != null)
{
sb._ScratchGraphics.Dispose();
}
if (needNewBitmap)
{
Bitmap = sb._ScratchBuffer = new Bitmap(
minWidth, minHeight, System.Drawing.Imaging.PixelFormat.Format32bppRgb
);
HBitmap = sb._ScratchHBitmap = Bitmap.GetHbitmap();
var tempDC = graphics.GetHdc();
HDC = sb._ScratchHDC = CreateCompatibleDC(tempDC);
graphics.ReleaseHdc(tempDC);
SelectObject(HDC, HBitmap);
Graphics = sb._ScratchGraphics = Graphics.FromHdc(HDC);
}
else
{
HDC = sb._ScratchHDC;
HBitmap = sb._ScratchHBitmap;
Bitmap = sb._ScratchBuffer;
Graphics = sb._ScratchGraphics;
}
Graphics.ResetTransform();
Graphics.TranslateTransform(-region.X, -region.Y, System.Drawing.Drawing2D.MatrixOrder.Prepend);
Graphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;
Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;
DestinationGraphics = graphics;
DestinationRegion = region;
Cancelled = false;
}
