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diff --git a/fltk/fltk/PixelType.h b/fltk/fltk/PixelType.h
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+// "$Id: PixelType.h 1399 2006-08-11 02:15:20Z spitzak $"
+//
+// Copyright 1998-2006 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems to "fltk-bugs@fltk.org".
+
+#ifndef fltk_PixelType_h
+#define fltk_PixelType_h
+
+namespace fltk {
+
+/// \name fltk/PixelType.h
+//@{
+
+/**
+  Enumeration describing how colors are stored in an array of bytes
+  that is a pixel. This is used as an argument for fltk::drawimage(),
+  fltk::readimage(), and fltk::Image.
+
+  Notice that the order of the bytes in memory of ARGB32 or RGB32 is
+  a,r,g,b on a little-endian machine and b,g,r,a on a big-endian
+  machine. Due to the use of these types by Windows, this is often
+  the fastest form of data, if you have a choice. To convert an
+  fltk::Color to RGB32, shift it right by 8 (for ARGB32 shift the
+  alpha left 24 and or it in).
+
+  More types may be added in the future. The set is as minimal as
+  possible while still covering the types I have actually encountered.
+*/
+enum PixelType {
+  MASK	= 0,	//!< 1 byte of inverted mask, filled with current color
+  MONO	= 1,	//!< 1 byte of gray scale
+  RGBx	= 2,	//!< bytes in r,g,b,a,r,g,b,a... order, a byte is ignored
+  RGB	= 3, 	//!< bytes in r,g,b,r,g,b... order
+  RGBA	= 4,	//!< bytes in r,g,b,a,r,g,b,a... order
+  RGB32 = 5,	//!< 32-bit words containiing 0xaarrggbb (aa is ignored)
+  ARGB32= 6,	//!< 32-bit words containing 0xaarrggbb
+  // unpremulitplied is not yet implemented, acts like RGBA/ARGB32:
+  RGBM	= 7,	//!< unpremultiplied bytes in r,g,b,a order
+  MRGB32= 8	//!< unpremultiplied 0xaarrggbb
+};
+
+/**
+   Turn a PixelType into the number of bytes needed to hold a pixel.
+*/
+inline int depth(PixelType t) {return (t<2 ? 1 : t==3 ? 3 : 4);}
+
+//@}
+
+}
+
+#endif