/// <summary>
/// Clone image.
/// </summary>
///
/// <param name="sourceData">Source image data.</param>
///
/// <returns>Clones image from source image data. The message does not clone pallete in the
/// case if the source image has indexed pixel format.</returns>
///
public static Bitmap Clone(BitmapData sourceData)
{
// get source image size
int width = sourceData.Width;
int height = sourceData.Height;
// create new image
Bitmap destination = new Bitmap(width, height, sourceData.PixelFormat);
// lock destination bitmap data
BitmapData destinationData = destination.LockBits(
new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite, destination.PixelFormat);
SystemTools.CopyUnmanagedMemory(destinationData.Scan0, sourceData.Scan0, height * sourceData.Stride);
// unlock destination image
destination.UnlockBits(destinationData);
return(destination);
}
/// <summary>
/// Draw rectangle on the specified image.
/// </summary>
///
/// <param name="image">Source image to draw on.</param>
/// <param name="rectangle">Rectangle's coordinates to draw.</param>
/// <param name="color">Rectangle's color.</param>
///
/// <exception cref="UnsupportedImageFormatException">The source image has incorrect pixel format.</exception>
///
public static unsafe void Rectangle(UnmanagedImage image, Rectangle rectangle, Color color)
{
CheckPixelFormat(image.PixelFormat);
int pixelSize = System.Drawing.Image.GetPixelFormatSize(image.PixelFormat) / 8;
// image dimension
int imageWidth = image.Width;
int imageHeight = image.Height;
int stride = image.Stride;
// rectangle dimension and position
int rectX1 = rectangle.X;
int rectY1 = rectangle.Y;
int rectX2 = rectangle.X + rectangle.Width - 1;
int rectY2 = rectangle.Y + rectangle.Height - 1;
// check if rectangle is in the image
if ((rectX1 >= imageWidth) || (rectY1 >= imageHeight) || (rectX2 < 0) || (rectY2 < 0))
{
// nothing to draw
return;
}
int startX = Math.Max(0, rectX1);
int stopX = Math.Min(imageWidth - 1, rectX2);
int startY = Math.Max(0, rectY1);
int stopY = Math.Min(imageHeight - 1, rectY2);
if (image.PixelFormat == PixelFormat.Format8bppIndexed)
{
// grayscale image
byte gray = (byte)(0.2125 * color.R + 0.7154 * color.G + 0.0721 * color.B);
// draw top horizontal line
if (rectY1 >= 0)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + rectY1 * stride + startX;
SystemTools.SetUnmanagedMemory(ptr, gray, stopX - startX);
}
// draw bottom horizontal line
if (rectY2 < imageHeight)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + rectY2 * stride + startX;
SystemTools.SetUnmanagedMemory(ptr, gray, stopX - startX);
}
// draw left vertical line
if (rectX1 >= 0)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + startY * stride + rectX1;
for (int y = startY; y <= stopY; y++, ptr += stride)
{
*ptr = gray;
}
}
// draw right vertical line
if (rectX2 < imageWidth)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + startY * stride + rectX2;
for (int y = startY; y <= stopY; y++, ptr += stride)
{
*ptr = gray;
}
}
}
else
{
// color image
byte red = color.R;
byte green = color.G;
byte blue = color.B;
// draw top horizontal line
if (rectY1 >= 0)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + rectY1 * stride + startX * pixelSize;
for (int x = startX; x <= stopX; x++, ptr += pixelSize)
{
ptr[RGB.R] = red;
ptr[RGB.G] = green;
ptr[RGB.B] = blue;
}
}
// draw bottom horizontal line
if (rectY2 < imageHeight)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + rectY2 * stride + startX * pixelSize;
for (int x = startX; x <= stopX; x++, ptr += pixelSize)
{
ptr[RGB.R] = red;
ptr[RGB.G] = green;
ptr[RGB.B] = blue;
}
}
// draw left vertical line
if (rectX1 >= 0)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + startY * stride + rectX1 * pixelSize;
for (int y = startY; y <= stopY; y++, ptr += stride)
{
ptr[RGB.R] = red;
ptr[RGB.G] = green;
ptr[RGB.B] = blue;
}
}
// draw right vertical line
if (rectX2 < imageWidth)
{
byte *ptr = (byte *)image.ImageData.ToPointer() + startY * stride + rectX2 * pixelSize;
for (int y = startY; y <= stopY; y++, ptr += stride)
{
ptr[RGB.R] = red;
ptr[RGB.G] = green;
ptr[RGB.B] = blue;
}
}
}
}