From 9d052c650ba59ddc8132bce881bd487df31c5348 Mon Sep 17 00:00:00 2001 From: Masaya Tojo Date: Sat, 10 Aug 2024 23:08:10 +0900 Subject: Add `image-format` prefix to library name --- image-format/pnm/image.scm | 53 +++++++ image-format/pnm/pbm.scm | 70 +++++++++ image-format/pnm/pgm.scm | 91 +++++++++++ image-format/pnm/ppm.scm | 111 ++++++++++++++ image-format/pnm/private/bitwise.scm | 38 +++++ image-format/pnm/private/checker.scm | 65 ++++++++ image-format/pnm/private/double-byte.scm | 29 ++++ image-format/pnm/read.scm | 253 +++++++++++++++++++++++++++++++ image-format/pnm/write.scm | 123 +++++++++++++++ 9 files changed, 833 insertions(+) create mode 100644 image-format/pnm/image.scm create mode 100644 image-format/pnm/pbm.scm create mode 100644 image-format/pnm/pgm.scm create mode 100644 image-format/pnm/ppm.scm create mode 100644 image-format/pnm/private/bitwise.scm create mode 100644 image-format/pnm/private/checker.scm create mode 100644 image-format/pnm/private/double-byte.scm create mode 100644 image-format/pnm/read.scm create mode 100644 image-format/pnm/write.scm (limited to 'image-format/pnm') diff --git a/image-format/pnm/image.scm b/image-format/pnm/image.scm new file mode 100644 index 0000000..2e64752 --- /dev/null +++ b/image-format/pnm/image.scm @@ -0,0 +1,53 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm image) + (export make-pnm-image + pnm-image? + pnm-image-type + pnm-image-width + pnm-image-height + pnm-image-maxval + pnm-image-data + pnm-image-pixel-getter + pnm-image-pixel-setter + pnm-image-ref + pnm-image-set!) + (import (scheme base) + (scheme case-lambda)) + (begin + (define-record-type + (make-pnm-image type width height maxval data pixel-getter pixel-setter) + pnm-image? + (type pnm-image-type) + (width pnm-image-width) + (height pnm-image-height) + (maxval pnm-image-maxval) + (data pnm-image-data) + (pixel-getter pnm-image-pixel-getter) + (pixel-setter pnm-image-pixel-setter)) + + (define (pnm-image-ref pnm-image x y) + ((pnm-image-pixel-getter pnm-image) x y)) + + (define pnm-image-set! + (case-lambda + ((pnm-image x y v) + ((pnm-image-pixel-setter pnm-image) x y v)) + ((pnm-image x y r g b) + ((pnm-image-pixel-setter pnm-image) x y r g b)))))) diff --git a/image-format/pnm/pbm.scm b/image-format/pnm/pbm.scm new file mode 100644 index 0000000..eda2677 --- /dev/null +++ b/image-format/pnm/pbm.scm @@ -0,0 +1,70 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm pbm) + (export make-pbm-image + %make-pbm-image) + (import (scheme base) + (scheme case-lambda) + (image-format pnm image) + (image-format pnm private checker) + (image-format 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 "(image-format 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))))))))) diff --git a/image-format/pnm/pgm.scm b/image-format/pnm/pgm.scm new file mode 100644 index 0000000..39711e9 --- /dev/null +++ b/image-format/pnm/pgm.scm @@ -0,0 +1,91 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm pgm) + (export make-pgm-image + %make-pgm-image) + (import (scheme base) + (scheme case-lambda) + (image-format pnm image) + (image-format pnm private checker) + (image-format pnm private double-byte)) + (begin + (define make-pgm-image + (case-lambda + ((width height) + (make-pgm-image width height 255 #f)) + ((width height maxval) + (make-pgm-image width height maxval #f)) + ((width height maxval unsafe?) + (when (or (< maxval 0) + (< 65536 maxval)) + (error "(image-format pnm pgm) make-pgm: maxval is out of range")) + (let* ((byte-count (* width height + (if (< maxval 256) + 1 + 2))) + (data (make-bytevector byte-count 0))) + (%make-pgm-image width height maxval data unsafe?))))) + + (define (%make-pgm-image width height maxval data unsafe?) + (define (make-safe-pixel-getter pixel-getter) + (let ((check-xy (make-xy-checker width height))) + (lambda (x y) + (check-xy x y) + (pixel-getter x y)))) + (define (make-safe-pixel-setter pixel-setter) + (let ((check-xy (make-xy-checker width height)) + (check-value (make-value-checker maxval 'v))) + (lambda (x y v) + (check-xy x y) + (check-value v) + (pixel-setter x y v)))) + (when (or (< maxval 0) + (< 65536 maxval)) + (error "(image-format pnm pgm) make-pgm: maxval is out of range")) + (if (< maxval 256) + (let ((byte-count (* width height))) + (define (xy->idx x y) + (+ x (* y width))) + (define (pixel-getter x y) + (let ((idx (xy->idx x y))) + (bytevector-u8-ref data idx))) + (define (pixel-setter x y v) + (let ((idx (xy->idx x y))) + (bytevector-u8-set! data idx v))) + (unless (= byte-count (bytevector-length data)) + (error (string-append "(image-format pnm pbm) make-pbm-image: Invalid bytevector length" byte-count))) + (make-pnm-image 'pgm width height maxval data + (if unsafe? pixel-getter (make-safe-pixel-getter pixel-getter)) + (if unsafe? pixel-setter (make-safe-pixel-setter pixel-setter)))) + (let ((byte-count (* width height 2))) + (define (xy->idx x y) (+ x (* y width))) + (define (pixel-getter x y) + (let ((idx (xy->idx x y))) + (combine-bytes (bytevector-u8-ref data idx) + (bytevector-u8-ref data (+ idx 1))))) + (define (pixel-setter x y v) + (let ((idx (xy->idx x y))) + (let-values (((v1 v2) (split-double-byte v))) + (bytevector-u8-set! data idx v1) + (bytevector-u8-set! data (+ idx 1) v2)))) + (unless (= byte-count (bytevector-length data)) + (error (string-append "(image-format pnm pbm) make-pbm-image: Invalid bytevector length" byte-count))) + (make-pnm-image 'pgm width height maxval data + (if unsafe? pixel-getter (make-safe-pixel-getter pixel-getter)) + (if unsafe? pixel-setter (make-safe-pixel-setter pixel-setter)))))))) diff --git a/image-format/pnm/ppm.scm b/image-format/pnm/ppm.scm new file mode 100644 index 0000000..2a644bf --- /dev/null +++ b/image-format/pnm/ppm.scm @@ -0,0 +1,111 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm ppm) + (export make-ppm-image + %make-ppm-image) + (import (scheme base) + (scheme case-lambda) + (image-format pnm image) + (image-format pnm private checker) + (image-format pnm private double-byte)) + (begin + (define make-ppm-image + (case-lambda + ((width height) + (make-ppm-image width height 255)) + ((width height maxval) + (make-ppm-image width height maxval #f)) + ((width height maxval unsafe?) + (when (or (< maxval 0) + (< 65536 maxval)) + (error "(image-format pnm ppm) make-ppm-image: Maxval is out of range")) + (let ((data (make-bytevector (* width + height + (if (< maxval 256) + 3 + 6)) + 0))) + (%make-ppm-image width height maxval data unsafe?))))) + + (define (%make-ppm-image width height maxval data unsafe?) + (define (make-safe-pixel-getter pixel-getter) + (let ((check-xy (make-xy-checker width height))) + (lambda (x y) + (check-xy x y) + (pixel-getter x y)))) + (define (make-safe-pixel-setter pixel-setter) + (let ((check-xy (make-xy-checker width height)) + (check-value-r (make-value-checker maxval 'r)) + (check-value-g (make-value-checker maxval 'g)) + (check-value-b (make-value-checker maxval 'b))) + (lambda (x y r g b) + (check-xy x y) + (check-value-r r) + (check-value-g g) + (check-value-b b) + (pixel-setter x y r g b)))) + (when (or (< maxval 0) + (< 65536 maxval)) + (error "(image-format pnm ppm) make-ppm-image: Maxval is out of range")) + (if (< maxval 256) + (let* ((w*3 (* width 3)) + (byte-count (* w*3 height))) + (define (xy->idx x y) (+ (* 3 x) (* y w*3))) + (define (pixel-getter x y) + (let ((idx (xy->idx x y))) + (values (bytevector-u8-ref data idx) + (bytevector-u8-ref data (+ idx 1)) + (bytevector-u8-ref data (+ idx 2))))) + (define (pixel-setter x y r g b) + (let ((idx (xy->idx x y))) + (bytevector-u8-set! data idx r) + (bytevector-u8-set! data (+ idx 1) g) + (bytevector-u8-set! data (+ idx 2) b))) + (unless (= byte-count (bytevector-length data)) + (error (string-append "(image-format pnm pbm) make-pbm-image: Invalid bytevector length" byte-count))) + (make-pnm-image 'ppm width height maxval data + (if unsafe? pixel-getter (make-safe-pixel-getter pixel-getter)) + (if unsafe? pixel-setter (make-safe-pixel-setter pixel-setter)))) + (let* ((w*6 (* width 6)) + (byte-count (* w*6 height))) + (define (xy->idx x y) (+ (* 6 x) (* y w*6))) + (define (pixel-getter x y) + (let ((idx (xy->idx x y))) + (values (combine-bytes (bytevector-u8-ref data idx) + (bytevector-u8-ref data (+ idx 1))) + (combine-bytes (bytevector-u8-ref data (+ idx 2)) + (bytevector-u8-ref data (+ idx 3))) + (combine-bytes (bytevector-u8-ref data (+ idx 4)) + (bytevector-u8-ref data (+ idx 5)))))) + (define (pixel-setter x y r g b) + (let ((idx (xy->idx x y))) + (let-values (((r1 r2) (split-double-byte r)) + ((g1 g2) (split-double-byte g)) + ((b1 b2) (split-double-byte b))) + (bytevector-u8-set! data idx r1) + (bytevector-u8-set! data (+ idx 1) r2) + (bytevector-u8-set! data (+ idx 2) g1) + (bytevector-u8-set! data (+ idx 3) g2) + (bytevector-u8-set! data (+ idx 4) b1) + (bytevector-u8-set! data (+ idx 5) b2)))) + (unless (= byte-count (bytevector-length data)) + (error (string-append "(image-format pnm pbm) make-pbm-image: Invalid bytevector length" byte-count))) + (make-pnm-image 'ppm width height maxval data + (if unsafe? pixel-getter (make-safe-pixel-getter pixel-getter)) + (if unsafe? pixel-setter (make-safe-pixel-setter pixel-setter)))))))) diff --git a/image-format/pnm/private/bitwise.scm b/image-format/pnm/private/bitwise.scm new file mode 100644 index 0000000..ffca4e9 --- /dev/null +++ b/image-format/pnm/private/bitwise.scm @@ -0,0 +1,38 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm private bitwise) + (export bitwise-and + bitwise-ior + arithmetic-shift + bit-set? + copy-bit) + (import (scheme base)) + (cond-expand + ((library (scheme bitwise)) + (import (only (scheme bitwise) + bitwise-and bitwise-ior arithmetic-shift + bit-set? copy-bit))) + ((library (srfi 60)) + (import (only (srfi 60) + bitwise-and bitwise-ior arithmetic-shift + bit-set? copy-bit))) + ((library (srfi 151)) + (import (only (srfi 151) + bitwise-and bitwise-ior arithmetic-shift + bit-set? copy-bit))))) diff --git a/image-format/pnm/private/checker.scm b/image-format/pnm/private/checker.scm new file mode 100644 index 0000000..8b7fcb6 --- /dev/null +++ b/image-format/pnm/private/checker.scm @@ -0,0 +1,65 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm private checker) + (export make-xy-checker + make-value-checker + make-boolean-value-checker) + (import (scheme base) + (scheme case-lambda) + (image-format pnm image)) + (begin + (define (make-xy-checker width height) + (lambda (x y) + (when (or (not (exact-integer? x)) + (< x 0) + (<= width x)) + (error (string-append "`x` must be an integer such that 0 <= `x` < " + (number->string width)) + x)) + (when (and (not (exact-integer? y)) + (< y 0) + (<= height y)) + (error (string-append "`y` must be an integer such that 0 <= `y` < " + (number->string width)) + y)))) + + (define (make-value-checker maxval sym) + (define message + (string-append "`" (symbol->string sym) "`" + " must be an integer such that 0 < " + "`" (symbol->string sym) "`" + " < " + (number->string maxval))) + (lambda (v) + (when (or (not (exact-integer? v)) + (< v 0) + (< maxval v)) + (error message v)))) + + (define (make-boolean-value-checker) + (lambda (v) + (when (not (boolean? v)) + (error "`v` must be a boolean value" v)))) + + (define (split-value v) + (values (modulo (quotient v 256) 256) + (modulo v 256))) + + (define (combine-values l r) + (+ (* 256 l) r)))) diff --git a/image-format/pnm/private/double-byte.scm b/image-format/pnm/private/double-byte.scm new file mode 100644 index 0000000..156b409 --- /dev/null +++ b/image-format/pnm/private/double-byte.scm @@ -0,0 +1,29 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm private double-byte) + (export split-double-byte combine-bytes) + (import (scheme base) + (image-format pnm private bitwise)) + (begin + (define (split-double-byte v) + (values (arithmetic-shift v -8) + (bitwise-and v 255))) + + (define (combine-bytes l r) + (bitwise-ior (arithmetic-shift l 8) r)))) diff --git a/image-format/pnm/read.scm b/image-format/pnm/read.scm new file mode 100644 index 0000000..0086113 --- /dev/null +++ b/image-format/pnm/read.scm @@ -0,0 +1,253 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm read) + (export pnm-image-read + pnm-parse-error?) + (import (scheme base) + (scheme case-lambda) + (image-format pnm image) + (image-format pnm pbm) + (image-format pnm pgm) + (image-format pnm ppm)) + (begin + (define pnm-image-read + (case-lambda + ((in) + (pnm-image-read in #f)) + ((in unsafe?) + (define (read-u8*) + (let ((u8 (read-u8 in))) + (when (eof-object? u8) + (unexpected-eof-error)) + u8)) + (define (read-magic-number*) + (let ((magic-number (read-magic-number in))) + (when (eof-object? magic-number) + (unexpected-eof-error)) + (unless magic-number + (unexpected-magic-number-error)) + magic-number)) + (define (read-number*) + (let ((n (read-number in))) + (when (eof-object? n) + (unexpected-eof-error)) + (unless n + (unexpected-character-error)) + n)) + (define (read-whitespaces*) + (let ((result (read-whitespaces in))) + (when (eof-object? result) + (unexpected-eof-error)) + (unless result + (unexpected-character-error)))) + (define (read-single-whitespace*) + (unless (whitespace? (read-u8*)) + (unexpected-character-error))) + + (let ((magic-number (read-magic-number*))) + (read-whitespaces*) + (let ((width (read-number in))) + (read-whitespaces*) + (let ((height (read-number in))) + (case magic-number + ((P4) + (read-single-whitespace*) + (%make-pbm-image width height + (read-bytevector (* (ceiling (/ width 8)) height) in) + unsafe?)) + ((P1) + (let ((byte-width (ceiling (/ width 8))) + (pbm-image (make-pbm-image width height unsafe?))) + (read-text-raster width height #f in + (lambda (x y v) + (pnm-image-set! pbm-image x y (= v 1))) + unexpected-eof-error + unexpected-character-error) + pbm-image)) + (else + (read-whitespaces*) + (let ((maxval (read-number in))) + (case magic-number + ((P6) + (read-single-whitespace*) + (%make-ppm-image width height maxval + (if (< maxval 256) + (read-bytevector (* 3 width height) in) + (read-bytevector (* 6 width height) in)) + unsafe?)) + ((P3) + (let ((ppm-image (make-ppm-image width height maxval unsafe?))) + (read-text-raster width height #t in (pnm-image-pixel-setter ppm-image) + unexpected-eof-error + unexpected-character-error) + ppm-image)) + ((P5) + (read-single-whitespace*) + (%make-pgm-image width height maxval + (if (< maxval 256) + (read-bytevector (* width height) in) + (read-bytevector (* 2 width height) in)) + unsafe?)) + ((P2) + (let ((pgm-image (make-pgm-image width height maxval unsafe?))) + (read-text-raster width height #f in (pnm-image-pixel-setter pgm-image) + unexpected-eof-error + unexpected-character-error) + pgm-image)))))))))))) + + (define (whitespace? u8) + (case (integer->char u8) + ((#\newline + #\return + #\tab + #\space + #\x000B ;; Vertical Tab + #\x000c ;; Form Feed + ) + #t) + (else #f))) + + (define (comment? u8) + (char=? #\# (integer->char u8))) + + (define (newline? u8) + (case (integer->char u8) + ((#\newline) #t) + (else #f))) + + (define (read-comment in) + (let ((u8 (peek-u8 in))) + (cond ((eof-object? u8) (eof-object)) + ((newline? u8) + (read-u8 in) + (skip-whitespace in)) + (else + (read-u8 in) + (read-comment in))))) + + (define (skip-whitespace in) + (let ((u8 (peek-u8 in))) + (cond ((eof-object? u8) #t) + ((whitespace? u8) + (read-u8 in) + (skip-whitespace in)) + ((comment? u8) + (read-u8 in) + (read-comment in)) + (else #t)))) + + (define (digit? u8) + (and (<= 48 u8) + (<= u8 57))) + + (define (u8->integer u8) + (- u8 48)) + + (define (read-magic-number in) + (let* ((P/u8 (char->integer #\P)) + (u8-1 (read-u8 in)) + (u8-2 (read-u8 in)) + (u8-2/int (u8->integer u8-2))) + (cond ((or (eof-object? u8-1) (eof-object? u8-2)) (eof-object)) + ((and (= u8-1 P/u8) (= u8-2/int 6)) 'P6) + ((and (= u8-1 P/u8) (= u8-2/int 5)) 'P5) + ((and (= u8-1 P/u8) (= u8-2/int 4)) 'P4) + ((and (= u8-1 P/u8) (= u8-2/int 3)) 'P3) + ((and (= u8-1 P/u8) (= u8-2/int 2)) 'P2) + ((and (= u8-1 P/u8) (= u8-2/int 1)) 'P1) + (else #f)))) + + (define (read-whitespaces in) + (let ((u8 (peek-u8 in))) + (cond ((eof-object? u8) (eof-object)) + ((whitespace? u8) + (read-u8 in) + (skip-whitespace in)) + (else #f)))) + + (define (read-text-raster width height rgb? in proc fail-eof-object fail-unexpected-char) + (call-with-current-continuation + (lambda (return) + (define (read-whitespaces*) + (let ((result (read-whitespaces in))) + (when (eof-object? result) + (return (fail-eof-object))) + (unless result + (return (fail-unexpected-char))))) + (define (read-number*) + (let ((number (read-number in))) + (when (eof-object? number) + (return (fail-eof-object))) + (unless number + (return (fail-unexpected-char))) + number)) + (let ((size (* width height))) + (do ((y 0 (+ y 1))) + ((= y height)) + (do ((x 0 (+ x 1))) + ((= x width)) + (if rgb? + (let* ((r (begin (read-whitespaces*) (read-number*))) + (g (begin (read-whitespaces*) (read-number*))) + (b (begin (read-whitespaces*) (read-number*)))) + (proc x y r g b)) + (proc x y (begin (read-whitespaces*) (read-number*)))))))))) + + (define (read-number in) + (call-with-current-continuation + (lambda (return) + (let ((u8 (peek-u8 in))) + (when (eof-object? u8) + (return (eof-object))) + (when (not (digit? u8)) + (return #f))) + (let loop ((number 0)) + (let ((u8 (peek-u8 in))) + (cond ((eof-object? u8) (eof-object)) + ((digit? u8) + (read-u8 in) + (loop (+ (* number 10) (u8->integer u8)))) + (else number))))))) + + (define (unexpected-magic-number-error) + (raise (pnm-parse-error "(image-format pnm read) pnm-image-read: Not supported magic number"))) + (define (unexpected-eof-error) + (raise (pnm-parse-error "(image-format pnm read) pnm-image-read: Unexpected end of file"))) + (define (unexpected-character-error) + (raise (pnm-parse-error "(image-format pnm read) pnm-image-read: Unexpected character")))) + (cond-expand + ((library (srfi 35)) + (import (srfi 35)) + (begin + (define-condition-type &pnm-parse-error &error + pnm-parse-error?) + + (define (pnm-parse-error msg) + (raise (condition (&pnm-parse-error) + (&message + (message msg))))))) + (r7rs + (begin + (define-record-type + (make-pnm-parse-error message) + pnm-parse-error? + (message pnm-parse-error-message)) + + (define (pnm-parse-error msg) + (raise (make-pnm-parse-error msg))))))) diff --git a/image-format/pnm/write.scm b/image-format/pnm/write.scm new file mode 100644 index 0000000..b2f807c --- /dev/null +++ b/image-format/pnm/write.scm @@ -0,0 +1,123 @@ +;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS +;;; Copyright © 2024 Masaya Tojo +;;; +;;; 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 . + +(define-library (image-format pnm write) + (export pnm-image-write) + (import (scheme base) + (scheme case-lambda) + (image-format pnm image)) + (begin + (define pnm-image-write + (case-lambda + ((pnm-image out) + (case (pnm-image-type pnm-image) + ((ppm) + (write-string-u8 "P6\n" out)) + ((pgm) + (write-string-u8 "P5\n" out)) + ((pbm) + (write-string-u8 "P4\n" out)) + (else + (error "(image-format pnm write) pnm-image-write: Not supported type" (pnm-image-type pnm-image)))) + (write-string-u8 (number->string (pnm-image-width pnm-image)) out) + (write-string-u8 " " out) + (write-string-u8 (number->string (pnm-image-height pnm-image)) out) + (write-string-u8 "\n" out) + (case (pnm-image-type pnm-image) + ((pgm ppm) + (write-string-u8 (number->string (pnm-image-maxval pnm-image)) out) + (write-string-u8 "\n" out))) + (write-bytevector (pnm-image-data pnm-image) out)) + ((pnm-image out plain?) + (if plain? + (pnm-image-write/plan pnm-image out) + (pnm-image-write pnm-image out))))) + + (define (pnm-image-write/plan pnm-image out) + (case (pnm-image-type pnm-image) + ((ppm) + (write-string-u8 "P3\n" out)) + ((pgm) + (write-string-u8 "P2\n" out)) + ((pbm) + (write-string-u8 "P1\n" out)) + (else + (error "(image-format pnm write) image-write: Not supported type" (pnm-image-type pnm-image)))) + (write-string-u8 (number->string (pnm-image-width pnm-image)) out) + (write-string-u8 " " out) + (write-string-u8 (number->string (pnm-image-height pnm-image)) out) + (write-string-u8 "\n" out) + (case (pnm-image-type pnm-image) + ((pgm ppm) + (write-string-u8 (number->string (pnm-image-maxval pnm-image)) out) + (write-string-u8 "\n" out))) + (let-values (((write-token write-newline) + (limit-line-length-writer 70 out))) + (let ((width (pnm-image-width pnm-image)) + (height (pnm-image-height pnm-image))) + (define (write-raster write-pixel) + (do ((y 0 (+ y 1))) + ((= y height)) + (write-pixel 0 y) + (do ((x 1 (+ x 1))) + ((= x width)) + (write-pixel x y)) + (write-newline))) + (case (pnm-image-type pnm-image) + ((ppm) + (write-raster + (lambda (x y) + (let-values (((r g b) (pnm-image-ref pnm-image x y))) + (write-token (number->string r)) + (write-token (number->string g)) + (write-token (number->string b)))))) + ((pgm) + (write-raster + (lambda (x y) + (let ((v (pnm-image-ref pnm-image x y))) + (write-token (number->string v)))))) + ((pbm) + (write-raster + (lambda (x y) + (let ((b (pnm-image-ref pnm-image x y))) + (write-token (if b "1" "0")))))))))) + + (define (write-string-u8 str out) + (string-for-each (lambda (c) (write-u8 (char->integer c) out)) + str)) + + (define (limit-line-length-writer limit out) + (let ((current-length 0)) + (define (write-token str) + (let ((str-len (string-length str))) + (cond ((zero? current-length) + (write-string-u8 str out) + (set! current-length str-len)) + ((<= (+ current-length str-len 1) limit) + (write-string-u8 " " out) + (write-string-u8 str out) + (set! current-length (+ current-length 1 str-len))) + (else + (write-string-u8 "\n" out) + (write-string-u8 str out) + (set! current-length str-len))))) + (define (write-newline) + (write-string-u8 "\n" out) + (set! current-length 0)) + (values write-token + write-newline))))) -- cgit v1.2.3