/// <summary> Initialize local ressources for all constructors. </summary>
/// <param name="bmp"> The bitmap associated with this graphic. <see cref="Bitmap"/> </param>
private void InitializeGraphicRessources(Bitmap bmp)
{
IntPtr visual = X11lib.XDefaultVisual(_display, _screenNumber);
if (visual == IntPtr.Zero)
{
throw new OperationCanceledException("Failed to investigate default visual.");
}
_width = bmp.Width;
_height = bmp.Height;
// Prepare bitmap conversion.
int colorPixelBytes = 4;
int maskLineBytes = (int)((_width + (int)IMAGE_PADDING - 1) / (int)IMAGE_PADDING);
_graphicDepth = (int)X11lib.XDefaultDepth(_display, _screenNumber);
if (_graphicDepth > 16)
{
colorPixelBytes = 4;
}
else if (_graphicDepth > 8)
{
colorPixelBytes = 2;
}
else
{
colorPixelBytes = 1;
}
// ### Allocate bitmap conversion data.
// The bitmap color data. Use a temporary managed byte array for speed.
byte[] graphicData = new byte[_height * _width * colorPixelBytes];
// The bitmap transparency data. Use a temporary managed byte array for speed.
byte[] maskData = new byte[_height * maskLineBytes];
// Quick access to current line's color pixel.
int graphicPixelIndex = 0;
// Quick access to current line's mask pixel.
int maskPixelIndex = 0;
// Reduce slow calls to bmp.GetPixel (x,y).
Color pixelColor = Color.Black;
// Determine whether transparency is required.
bool transparency = false;
// ### Convert bitmap.
for (int y = 0; y < _height; y++)
{
for (int x = 0; x < _width; x++)
{
graphicPixelIndex = (y * _width + x) << 2;
maskPixelIndex = y * maskLineBytes + (x >> 3);
pixelColor = bmp.GetPixel(x, y);
graphicData[graphicPixelIndex + 0] = pixelColor.B; // B
graphicData[graphicPixelIndex + 1] = pixelColor.G; // G
graphicData[graphicPixelIndex + 2] = pixelColor.R; // R
graphicData[graphicPixelIndex + 3] = pixelColor.A; // A
if (pixelColor.B == 255 && pixelColor.G == 255 && pixelColor.R == 255)
{
byte summand = (byte)(1 << (x % 8));
maskData[maskPixelIndex] = (byte)(maskData[maskPixelIndex] + summand);
transparency = true;
}
}
}
// ### Create XImage.
// The bitmap color data.
IntPtr graphicDataHandle = Marshal.AllocHGlobal(graphicData.Length);
// Allocate not movable memory.
Marshal.Copy(graphicData, 0, graphicDataHandle, graphicData.Length);
// Client side XImage storage.
_graphicXImage = X11lib.XCreateImage(_display, visual, (TUint)_graphicDepth,
X11lib.TImageFormat.ZPixmap, (TInt)0,
graphicDataHandle, (TUint)_width, (TUint)_height,
IMAGE_PADDING, ASSUME_CONTIGUOUS);
if (_graphicXImage == IntPtr.Zero)
{
throw new OperationCanceledException("Image creation for graphic failed.");
}
if (transparency == true)
{
IntPtr maskDataHandle = Marshal.AllocHGlobal(maskData.Length); // The bitmap bitmap transparency data.
Marshal.Copy(maskData, 0, maskDataHandle, maskData.Length); // Allocate not movable memory.
// Client side storage.
_transpXImage = X11lib.XCreateImage(_display, visual, (TUint)_clipDepth, X11lib.TImageFormat.XYBitmap, (TInt)0,
maskDataHandle, (TUint)_width, (TUint)_height, IMAGE_PADDING, ASSUME_CONTIGUOUS);
if (_transpXImage == IntPtr.Zero)
{
throw new OperationCanceledException("Image creation for transparency mask failed.");
}
}
}