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pic-imag.scm
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1999-01-02
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#| -*-Scheme-*-
$Id: pic-imag.scm,v 1.10 1999/01/02 06:06:43 cph Exp $
Copyright (c) 1991-1999 Massachusetts Institute of Technology
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|#
;;;; 6.001 Images
(declare (usual-integrations))
;;; Procedure to build an image given a picture and the magnification factors
(define (build-image pic window h-sf v-sf pic-min pic-max)
(let* ((gray-map (n-gray-map window))
(pic-height (picture-height pic)) ;py
(pic-width (picture-width pic)) ;x
(pic-data (picture-data pic))
(image-width (fix:* h-sf pic-width)) ;x
(image-height (fix:* v-sf pic-height)) ;iy
(use-string?
(for-all? (vector->list gray-map)
(lambda (n)
(<= 0 n 255))))
(image (image/create window image-width image-height))
(pixels
(if use-string?
(make-string (fix:* image-width image-height))
(make-vector (fix:* image-width image-height))))
(write-pixel (if use-string? vector-8b-set! vector-set!))
(py-max (- pic-height 1))
(rect-index-height (fix:* v-sf image-width))
(binner
(cutoff-binner .01 pic-min pic-max (vector-length gray-map)))
(gray-pixel
(lambda (pixel-value)
(vector-ref gray-map (binner pixel-value)))))
(cond ((and (fix:= 1 h-sf) (fix:= 1 v-sf))
(let y-loop ((py py-max) (iy-index 0))
(if (fix:<= 0 py)
(begin
(let ((pic-row (vector-ref pic-data py)))
(let x-loop ((px 0))
(if (fix:< px pic-width)
(begin
(write-pixel
pixels
(fix:+ px iy-index)
(gray-pixel (flo:vector-ref pic-row px)))
(x-loop (fix:+ px 1))))))
(y-loop (fix:- py 1) (fix:+ iy-index rect-index-height))))))
((and (fix:= 2 h-sf) (fix:= 2 v-sf))
(let y-loop ((py py-max) (iy-index 0))
(if (fix:<= 0 py)
(let ((pic-row (vector-ref pic-data py)))
(let x-loop ((px 0) (ix 0))
(if (fix:< px pic-width)
(let* ((n-is-0 (fix:+ ix iy-index))
(n-is-1 (fix:+ n-is-0 image-width))
(v (gray-pixel (flo:vector-ref pic-row px))))
(write-pixel pixels n-is-0 v)
(write-pixel pixels (fix:+ n-is-0 1) v)
(write-pixel pixels n-is-1 v)
(write-pixel pixels (fix:+ n-is-1 1) v)
(x-loop (fix:+ px 1) (fix:+ ix h-sf)))
(y-loop (fix:- py 1)
(fix:+ iy-index rect-index-height))))))))
((and (fix:= 3 h-sf) (fix:= 3 v-sf))
(let y-loop ((py py-max) (iy-index 0))
(if (fix:<= 0 py)
(let ((pic-row (vector-ref pic-data py)))
(let x-loop ((px 0) (ix 0))
(if (fix:< px pic-width)
(let* ((row0 (fix:+ ix iy-index))
(row1 (fix:+ row0 image-width))
(row2 (fix:+ row1 image-width))
(v (gray-pixel (flo:vector-ref pic-row px))))
(write-pixel pixels row0 v)
(write-pixel pixels (fix:+ row0 1) v)
(write-pixel pixels (fix:+ row0 2) v)
(write-pixel pixels row1 v)
(write-pixel pixels (fix:+ row1 1) v)
(write-pixel pixels (fix:+ row1 2) v)
(write-pixel pixels row2 v)
(write-pixel pixels (fix:+ row2 1) v)
(write-pixel pixels (fix:+ row2 2) v)
(x-loop (fix:+ px 1) (fix:+ ix h-sf)))
(y-loop (fix:- py 1)
(fix:+ iy-index rect-index-height))))))))
((and (fix:= 4 h-sf) (fix:= 4 v-sf))
(let y-loop ((py py-max) (iy-index 0))
(if (fix:<= 0 py)
(let ((pic-row (vector-ref pic-data py)))
(let x-loop ((px 0) (ix 0))
(if (fix:< px pic-width)
(let* ((row0 (fix:+ ix iy-index))
(row1 (fix:+ row0 image-width))
(row2 (fix:+ row1 image-width))
(row3 (fix:+ row2 image-width))
(v (gray-pixel (flo:vector-ref pic-row px))))
(write-pixel pixels row0 v)
(write-pixel pixels (fix:+ row0 1) v)
(write-pixel pixels (fix:+ row0 2) v)
(write-pixel pixels (fix:+ row0 3) v)
(write-pixel pixels row1 v)
(write-pixel pixels (fix:+ row1 1) v)
(write-pixel pixels (fix:+ row1 2) v)
(write-pixel pixels (fix:+ row1 3) v)
(write-pixel pixels row2 v)
(write-pixel pixels (fix:+ row2 1) v)
(write-pixel pixels (fix:+ row2 2) v)
(write-pixel pixels (fix:+ row2 3) v)
(write-pixel pixels row3 v)
(write-pixel pixels (fix:+ row3 1) v)
(write-pixel pixels (fix:+ row3 2) v)
(write-pixel pixels (fix:+ row3 3) v)
(x-loop (fix:+ px 1) (fix:+ ix h-sf)))
(y-loop (fix:- py 1)
(fix:+ iy-index rect-index-height))))))))
(else
(let y-loop ((py py-max) (iy-index 0))
(if (fix:<= 0 py)
(let ((pic-row (vector-ref pic-data py)))
(let x-loop ((px 0) (ix 0))
(if (fix:< px pic-width)
(let* ((v (gray-pixel (flo:vector-ref pic-row px)))
(n-start (fix:+ ix iy-index))
(n-end (fix:+ n-start rect-index-height)))
(let n-loop ((n n-start))
(if (fix:< n n-end)
(let ((m-end (fix:+ n h-sf)))
(let m-loop ((m n))
(if (fix:< m m-end)
(begin
(write-pixel pixels m v)
(m-loop (fix:+ m 1)))
(n-loop (fix:+ n image-width)))))
(x-loop (fix:+ px 1) (fix:+ ix h-sf)))))
(y-loop (fix:- py 1)
(fix:+ iy-index rect-index-height)))))))))
;; Kludge: IMAGE/FILL-FROM-BYTE-VECTOR should take an argument
;; that specifies what color a given byte in PIXELS maps to.
;; OS/2 requires this information, so we supply it here.
(if (eq? 'OS/2 microcode-id/operating-system)
(os2-image/set-colormap image (os2-image-colormap)))
(image/fill-from-byte-vector image pixels)
(1d-table/put! (graphics-device/properties window) image (cons h-sf v-sf))
image))