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-rw-r--r--pnm/pbm.scm70
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diff --git a/pnm/pbm.scm b/pnm/pbm.scm
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-;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS
-;;; Copyright © 2024 Masaya Tojo <masaya@tojo.tokyo>
-;;;
-;;; This file is part of R7RS-PNM.
-;;;
-;;; R7RS-PNM is free software: you can redistribute it and/or modify it
-;;; under the terms of the GNU Lesser General Public License as published
-;;; by the Free Software Foundation, either version 3 of the License, or
-;;; (at your option) any later version.
-;;;
-;;; R7RS-PNM 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 Lesser General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU Lesser General Public License
-;;; along with R7RS-PNM. If not, see <https://www.gnu.org/licenses/>.
-
-(define-library (pnm pbm)
- (export make-pbm-image
- %make-pbm-image)
- (import (scheme base)
- (scheme case-lambda)
- (pnm image)
- (pnm private checker)
- (pnm private bitwise))
- (begin
- (define make-pbm-image
- (case-lambda
- ((width height)
- (make-pbm-image width height #f))
- ((width height unsafe?)
- (let* ((byte-width (ceiling (/ width 8)))
- (byte-count (* byte-width height))
- (data (make-bytevector byte-count 0)))
- (%make-pbm-image width height data unsafe?)))))
-
- (define (%make-pbm-image width height data unsafe?)
- (let* ((byte-width (ceiling (/ width 8)))
- (byte-count (* byte-width height)))
- (define (xy->byte-idx+bit-idx x y)
- (let-values (((byte-x bit-x) (floor/ x 8)))
- (values (+ (* y byte-width)
- byte-x)
- bit-x)))
- (define (pixel-getter x y)
- (let-values (((byte-idx bit-idx) (xy->byte-idx+bit-idx x y)))
- (let ((byte (bytevector-u8-ref data byte-idx)))
- (bit-set? (- 7 bit-idx) byte))))
- (define (pixel-setter x y b)
- (let-values (((byte-idx bit-idx) (xy->byte-idx+bit-idx x y)))
- (let ((byte (bytevector-u8-ref data byte-idx)))
- (bytevector-u8-set! data byte-idx
- (copy-bit (- 7 bit-idx) byte b)))))
- (unless (= byte-count (bytevector-length data))
- (error (string-append "(pnm pbm) make-pbm-image: Invalid bytevector length" byte-count)))
- (let ((check-xy (make-xy-checker width height))
- (check-boolean-value (make-boolean-value-checker)))
- (make-pnm-image 'pbm width height #t data
- (if unsafe?
- pixel-getter
- (lambda (x y)
- (check-xy x y)
- (pixel-getter x y)))
- (if unsafe?
- pixel-setter
- (lambda (x y v)
- (check-xy x y)
- (check-boolean-value v)
- (pixel-setter x y v)))))))))