private bool EnsureBuffersCompatible(PipeFrame frame)
{
if (_mappedFile1 != null && _mapView1 != null &&
_mappedFile2 != null && _mapView2 != null &&
_buffer1 != null && _buffer2 != null &&
_buffersSize.Width == frame.Width && _buffersSize.Height == frame.Height)
{
return(true);
}
try {
ReleaseHandles();
lock (mapViewLock) {
_mappedFile1 = MemoryMappedFile.OpenExisting("cnc_buffer_spy1", MemoryMappedFileRights.Read);
_mapView1 = _mappedFile1.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read);
_mappedFile2 = MemoryMappedFile.OpenExisting("cnc_buffer_spy2", MemoryMappedFileRights.Read);
_mapView2 = _mappedFile2.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read);
}
lock (canvas.ImageLock) {
canvas.Image = null;
_buffer1 = new Bitmap((int)frame.Width, (int)frame.Height, PixelFormat.Format24bppRgb);
_buffer2 = new Bitmap((int)frame.Width, (int)frame.Height, PixelFormat.Format24bppRgb);
}
_buffersSize = new Size((int)frame.Width, (int)frame.Height);
return(true);
}
catch {
return(false);
}
}
private unsafe Bitmap ImageFromMappedFileView(PipeFrame frame)
{
if (!EnsureBuffersCompatible(frame))
{
return(null);
}
var view = frame.DestBuffer == DestinationBuffer.Buffer1 ? _mapView1 : _mapView2;
var bm = frame.DestBuffer == DestinationBuffer.Buffer1 ? _buffer1 : _buffer2;
// Debug.Assert(bm != canvas.Image); // this assert would only work under a lock {}
byte *ptr = null;
view.SafeMemoryMappedViewHandle.AcquirePointer(ref ptr);
var bmd = bm.LockBits(new Rectangle(0, 0, bm.Width, bm.Height), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
bool jet = ckbJetColormap.Checked;
int anchorX = (int)((frame.SourceBufferAnchor / 2) % frame.Width);
int anchorY = (int)((frame.SourceBufferAnchor / 2) / frame.Width);
if (frame.PixelFormat == BufferPixelFormat.Format16bppGrayscale)
{
Blit16bppGrayscale(frame, ptr, bmd, anchorY, anchorX, jet);
}
if (frame.PixelFormat == BufferPixelFormat.Format16bppRGB)
{
Blit16bppRGB(frame, ptr, bmd, anchorY, anchorX);
}
else if (frame.PixelFormat == BufferPixelFormat.Format8bpp)
{
Blit8bpp(frame, ptr, bmd, anchorX, anchorY);
}
view.SafeMemoryMappedViewHandle.ReleasePointer();
bm.UnlockBits(bmd);
lock (mapViewLock)
_mapViewOfShownImage = view;
_lastFrame = frame;
return(bm);
}
private unsafe void Blit8bpp(PipeFrame frame, byte *ptr, BitmapData bmd, int anchorX, int anchorY)
{
for (int row = 0; row < bmd.Height; row++)
{
byte *w = (byte *)bmd.Scan0.ToPointer() + row * bmd.Stride;
byte *r = ptr + ((row + anchorY) % frame.Height) * frame.Width;
int endCol = (int)((anchorX + frame.Width - 1) % frame.Width);
for (int col = anchorX; col != endCol;)
{
// low byte
*w++ = r[col];
*w++ = r[col];
*w++ = r[col];
col++;
if (col == frame.Width)
{
col = 0;
}
}
}
}
private static unsafe void Blit16bppRGB(PipeFrame frame, byte *ptr, BitmapData bmd, int anchorY, int anchorX)
{
for (int row = 0; row < bmd.Height; row++)
{
byte * w = (byte *)bmd.Scan0.ToPointer() + row * bmd.Stride;
ushort *scan = (ushort *)(ptr + 2 * ((row + anchorY) % frame.Height) * frame.Width);
int endCol = (int)((anchorX + frame.Width - 1) % frame.Width);
for (int col = anchorX; col != endCol;)
{
ushort bgr565 = scan[col];
* w++ = (byte)((bgr565 & 0x001F) << 3); // b
* w++ = (byte)((bgr565 & 0x07E0) >> 3); // g
* w++ = (byte)((bgr565 & 0xF800) >> 8); // r
col++;
if (col == frame.Width)
{
col = 0;
}
}
}
}
private static unsafe void Blit16bppGrayscale(PipeFrame frame, byte *ptr, BitmapData bmd, int anchorY, int anchorX, bool jet)
{
// determine range
ushort *p = (ushort *)ptr;
ushort min = 65535;
ushort max = 0;
if (jet)
{
ushort *end = p + frame.Width * frame.Height;
while (p != end)
{
if (min > *p)
{
min = *p;
}
if (max < *p)
{
max = *p;
}
++p;
}
}
float range = max - min;
for (int row = 0; row < bmd.Height; row++)
{
byte *w = (byte *)bmd.Scan0.ToPointer() + row * bmd.Stride;
byte *scan = ptr + 2 * ((row + anchorY) % frame.Height) * frame.Width;
int endCol = (int)((anchorX + frame.Width - 1) % frame.Width);
for (int col = anchorX; col != endCol;)
{
if (jet)
{
ushort u = (ushort)((scan[col * 2 + 1] << 8) | scan[col * 2]);
float v = 2 * (u - min) / range;
byte b = (byte)Math.Max(0, 255 * (1 - v));
byte r = (byte)Math.Max(0, 255 * (v - 1));
byte g = (byte)(255 - b - r);
* w++ = g;
* w++ = b;
* w++ = r;
}
else
{
// low byte
*w++ = scan[col * 2 + 0];
*w++ = scan[col * 2 + 0];
*w++ = scan[col * 2 + 0];
}
col++;
if (col == frame.Width)
{
col = 0;
}
}
}
}
