/// <summary>
/// Creates a new, blank EditableBitmap with the specified width, height, and pixel format.
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="format"></param>
public EditableBitmap(int width, int height, PixelFormat format)
{
pixelFormatSize = Image.GetPixelFormatSize(format) / 8;
stride = width * pixelFormatSize;
int padding = (stride % 4);
stride += padding == 0?0:4 - padding;//pad out to multiple of 4
byteArray = new SharedPinnedByteArray(stride * height);
bitmap = new Bitmap(width, height, stride, format, byteArray.bitPtr);
}
/// <summary>
/// Creates an <see cref="EditableBitmap"/> as a view on a section of an existing <see cref="EditableBitmap"/>.
/// </summary>
/// <param name="source"></param>
/// <param name="viewArea"></param>
protected EditableBitmap(EditableBitmap source, Rectangle viewArea)
{
owner = source;
pixelFormatSize = source.pixelFormatSize;
byteArray = source.byteArray;
byteArray.AddReference();
stride = source.stride;
try
{
startOffset = source.startOffset + (stride * viewArea.Y) + (viewArea.X * pixelFormatSize);
bitmap = new Bitmap(viewArea.Width, viewArea.Height, stride, source.Bitmap.PixelFormat,
(IntPtr)(((int)byteArray.bitPtr) + startOffset));
}
finally
{
if (bitmap == null)
{
byteArray.ReleaseReference();
}
}
}