[mcclim-cvs] CVS mcclim/Extensions/Bitmap-formats

[rstrandh]

Update of /project/mcclim/cvsroot/mcclim/Extensions/Bitmap-formats
In directory cl-net:/tmp/cvs-serv26572/Extensions/Bitmap-formats

Added Files:
	tiff.lisp 
Log Message:
Tiff bitmap formats from Cyrus Harmon.



--- /project/mcclim/cvsroot/mcclim/Extensions/Bitmap-formats/tiff.lisp	2009/06/08 14:39:57	NONE
+++ /project/mcclim/cvsroot/mcclim/Extensions/Bitmap-formats/tiff.lisp	2009/06/08 14:39:57	1.1
;;; -*- Mode: Lisp; Package: MCCLIM-IMAGES -*-

;;;  (c) copyright 2009 by 
;;;           Cyrus Harmon (ch-lisp at bobobeach.com)
;;;
;;; 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.

(in-package :clim-internals)

(define-bitmap-file-reader :tiff (pathname)
  (let ((tiff-image (tiff:read-tiff-file pathname)))
    (with-accessors ((height tiff:tiff-image-length)
                     (width tiff:tiff-image-width)
                     (ncomp tiff:tiff-image-samples-per-pixel)
                     (data tiff:tiff-image-data))
        tiff-image
      (let* ((array (make-array (list height width)
                                :element-type '(unsigned-byte 32))))
        (case ncomp
          (3
           (dotimes (x width)
             (dotimes (y height)
               (let ((red (aref data (+ (* x 3) (* y width 3))))
                     (green (aref data (+ (* x 3) (* y width 3) 1)))
                     (blue (aref data (+ (* x 3) (* y width 3) 2))))
                 (setf (aref array y x)
                       (dpb red (byte 8 0)
                            (dpb green (byte 8 8)
                                 (dpb blue (byte 8 16)
                                      (dpb (- 255 0) (byte 8 24) 0)))))))))
          (1
           (dotimes (x width)
             (dotimes (y height)
               (let ((gray (aref data (+ x (* y width)))))
                 (setf (aref array y x)
                       (dpb gray (byte 8 0)
                            (dpb gray (byte 8 8)
                                 (dpb gray (byte 8 16)
                                      (dpb (- 255 0) (byte 8 24) 0))))))))))
        array))))

(define-bitmap-file-reader :tif (pathname)
  (read-bitmap-file pathname :format :tiff))