92 lines
2.7 KiB
Plaintext
92 lines
2.7 KiB
Plaintext
;;;;
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;;;; i m a g e . s t k -- Images functions for STk
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;;;;
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;;;; Copyright © 1996-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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;;;;
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;;;; Permission to use, copy, and/or distribute this software and its
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;;;; documentation for any purpose and without fee is hereby granted, provided
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;;;; that both the above copyright notice and this permission notice appear in
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;;;; all copies and derived works. Fees for distribution or use of this
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;;;; software or derived works may only be charged with express written
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;;;; permission of the copyright holder.
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;;;; This software is provided ``as is'' without express or implied warranty.
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;;;;
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;;;; Author: Erick Gallesio [eg@unice.fr]
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;;;; Creation date: 15-Oct-1996 14:25
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;;;; Last file update: 22-Jan-1999 12:10
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(require "hash")
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(select-module Tk)
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(define find-image #f)
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(define make-image #f)
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(define change-image #f)
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(define delete-image #f)
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;;
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;; Images are cached in a local cache variable. Each image is given a key
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;; so that multple use of the same image share the same copy
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;;
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(let* ((image-cache (make-hash-table string=?))
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(image-name (lambda (key) (& "*Img " key "*")))
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(mk-image (lambda (name opt)
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(let ((img #f)
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(name (image-name name))) ; to avoid breaking globals
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;; Try to create a bitmap then a pixmap else a photo image.
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(and (catch (set! img (apply image 'cre 'bitmap name opt)))
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(catch (set! img (apply image 'cre 'pixmap name opt)))
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(catch (set! img (apply image 'cre 'photo name opt))))
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img)))
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(create (lambda (key opt)
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(let ((img #f))
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(if (null? opt)
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;; No option given. Take the key as the file name
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(let loop ((l *image-path*))
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(if (null? l)
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#f
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(let ((f (string-append (car l) "/" key)))
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(set! img (mk-image key (list :file f)))
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(unless img (Loop (cdr l))))))
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;. Use option given
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(set! img (mk-image key opt)))
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(when img
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;; Found an image; Register it
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(hash-table-put! image-cache key img))
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img))))
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;;
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;; make-image
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;;
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(set! make-image (lambda (key . opt)
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(or (find-image key) (create key opt))))
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;;
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;; find-image
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;;
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(set! find-image (lambda (key)
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(hash-table-get image-cache key #f)))
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;;
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;; change-image
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;;
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(set! change-image (lambda (key . opt)
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(let ((img (find-image key)))
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(if img
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(create key opt)
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(error "change-image: no image with name ~S" key)))))
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;;
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;; delete-image
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;;
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(set! delete-image (lambda (key)
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(let ((img (find-image key)))
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(if img
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(begin
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(image 'delete (image-name key))
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(hash-table-remove! image-cache key))
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(error "free-image: no image with name ~S" key)))))
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)
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(provide "image")
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