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opticl.lisp
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opticl.lisp
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;;; Copyright (c) 2011 Cyrus Harmon, All rights reserved.
;;; See COPYRIGHT file for details.
(in-package :opticl)
(deftype image (&key channels element-type)
`(simple-array ,element-type
,(if (numberp channels)
(if (= channels 1)
`(* *)
`(* * ,channels))
channels)))
(deftype gray-image (&key element-type)
`(simple-array ,element-type (* *)))
(deftype rgb-image (&key element-type)
`(simple-array ,element-type (* * 3)))
(deftype rgba-image (&key element-type)
`(simple-array ,element-type (* * 4)))
(eval-when (:compile-toplevel :load-toplevel :execute)
(defparameter *image-types*
'((single-float-image :element-type single-float)
(double-float-image :element-type double-float)
(1-bit-gray-image :channels 1 :element-type (unsigned-byte 1))
(2-bit-gray-image :channels 1 :element-type (unsigned-byte 2))
(4-bit-gray-image :channels 1 :element-type (unsigned-byte 4))
(8-bit-gray-image :channels 1 :element-type (unsigned-byte 8))
(16-bit-gray-image :channels 1 :element-type (unsigned-byte 16))
(32-bit-gray-image :channels 1 :element-type (unsigned-byte 32))
(fixnum-gray-image :channels 1 :element-type fixnum)
(single-float-gray-image :channels 1 :element-type single-float)
(double-float-gray-image :channels 1 :element-type double-float)
(4-bit-rgb-image :channels 3 :element-type (unsigned-byte 4))
(8-bit-rgb-image :channels 3 :element-type (unsigned-byte 8))
(16-bit-rgb-image :channels 3 :element-type (unsigned-byte 16))
(single-float-rgb-image :channels 3 :element-type single-float)
(double-float-rgb-image :channels 3 :element-type double-float)
(4-bit-rgba-image :channels 4 :element-type (unsigned-byte 4))
(8-bit-rgba-image :channels 4 :element-type (unsigned-byte 8))
(16-bit-rgba-image :channels 4 :element-type (unsigned-byte 16))
(single-float-rgba-image :channels 4 :element-type single-float)
(double-float-rgba-image :channels 4 :element-type double-float)
)))
(macrolet
((frob-image (name &key channels element-type)
(let ((type (read-from-string (format nil "~A" name))))
(let ((ctor-function
(read-from-string (format nil "make-~A" type))))
`(progn
(deftype ,type () ',(list* 'image
(append
(when channels
`(:channels ,channels))
(when element-type
`(:element-type ,element-type)))))
(defun ,ctor-function
(height width &key (initial-element nil initial-element-p)
(initial-contents nil initial-contents-p))
(apply #'make-array (append (list height width)
(when ,(and channels
(> channels 1))
(list ,channels)))
:element-type ',element-type
(append
(when initial-element-p
`(:initial-element ,initial-element))
(when initial-contents-p
`(:initial-contents ,initial-contents)))))))))
(frobber ()
`(progn
,@(loop for image-spec in *image-types*
collect
(destructuring-bind (name &key channels element-type)
image-spec
`(frob-image ,name
,@(if channels
`(:channels ,channels))
,@(if element-type
`(:element-type ,element-type))))))))
(frobber))
;;; support functions/constants for the pixel setf-expander need to
;;; exist at compile time
(eval-when (:compile-toplevel :load-toplevel :execute)
(defun %get-array-dimensions-from-type-decl (type-decl)
"Extract the array dimension specifier from type declaration TYPE-DECL."
#+(or sbcl ccl)
(and type-decl
;; here we expect e.g. (TYPE SIMPLE-ARRAY (UNSIGNED-BYTE 8) (* * 3))
(listp type-decl)
(= (length type-decl) 4)
(fourth type-decl))
#+allegro
(and type-decl
;; here we expect e.g. (TYPE (SIMPLE-ARRAY (INTEGER 0 255) (* * 3)))
(listp type-decl)
(= (length type-decl) 2)
(= (length (second type-decl)) 3)
(third (second type-decl))))
(defun %get-image-dimensions (image-var env)
#+(or sbcl ccl allegro)
(when (symbolp image-var)
(multiple-value-bind (binding-type localp declarations)
(opticl-cltl2:variable-information image-var env)
(declare (ignore binding-type localp))
(let ((type-decl (find 'type declarations :key #'car)))
(%get-array-dimensions-from-type-decl type-decl)))))
(defconstant +max-image-channels+ 4))
(define-setf-expander pixel (image-var y x &environment env)
"Sets the (possibly multiple) image intensity value(s) at position
y, x to the provided value(s). For example, to set pixel [0,0] in an
rgb-image to R20, G40, B60, one would do (setf (pixel img 0 0) (values
20 40 60)). With proper type declarations for images, use of this
macro should yield non-consing setting of image intensity data. "
(multiple-value-bind (dummies vals newval setter getter)
(get-setf-expansion image-var env)
(declare (ignore newval setter))
(let ((image-dimensions (%get-image-dimensions getter env)))
(if image-dimensions
(let ((arity (or (and (= (length image-dimensions) 3)
(third image-dimensions))
1))
(temp-y (gensym))
(temp-x (gensym)))
(if (= arity 1)
(let ((store (gensym)))
(values `(,@dummies ,temp-y ,temp-x)
`(,@vals ,y ,x)
`(,store)
`(setf (aref ,getter ,temp-y ,temp-x) ,store)
`(aref ,getter ,temp-y ,temp-x)))
(let ((stores (map-into (make-list arity) #'gensym)))
(values `(,@dummies ,temp-y ,temp-x)
`(,@vals ,y ,x)
stores
`(progn (setf ,@(loop for i from 0
for store in stores
collect `(aref ,getter ,temp-y ,temp-x ,i)
collect store))
(values ,@stores))
`(values ,@(loop for i from 0 below (length stores)
collect `(aref ,getter ,temp-y ,temp-x ,i)))))))
(let ((syms (map-into (make-list +max-image-channels+) #'gensym)))
(let ((temp-y (gensym))
(temp-x (gensym)))
(values `(,@dummies ,temp-y ,temp-x)
`(,@vals ,y ,x)
syms
`(ecase (array-rank ,getter)
(3 (let ((d (array-dimension ,getter 2)))
(case d
(1
(values
(setf (aref ,getter ,temp-y ,temp-x 0) ,(elt syms 0))))
(2
(values
(setf (aref ,getter ,temp-y ,temp-x 0) ,(elt syms 0))
(setf (aref ,getter ,temp-y ,temp-x 1) ,(elt syms 1))))
(3
(values
(setf (aref ,getter ,temp-y ,temp-x 0) ,(elt syms 0))
(setf (aref ,getter ,temp-y ,temp-x 1) ,(elt syms 1))
(setf (aref ,getter ,temp-y ,temp-x 2) ,(elt syms 2))))
(4
(values
(setf (aref ,getter ,temp-y ,temp-x 0) ,(elt syms 0))
(setf (aref ,getter ,temp-y ,temp-x 1) ,(elt syms 1))
(setf (aref ,getter ,temp-y ,temp-x 2) ,(elt syms 2))
(setf (aref ,getter ,temp-y ,temp-x 3) ,(elt syms 3))))
(t (loop for i below d
collect (setf (aref ,getter ,temp-y ,temp-x i) (elt (list ,@syms) i)))))))
(2 (setf (aref ,getter ,temp-y ,temp-x) ,(elt syms 0))))
`(ecase (array-rank ,getter)
(3
(let ((d (array-dimension ,getter 2)))
(case d
(1
(values
(aref ,getter ,temp-y ,temp-x 0)))
(2
(values
(aref ,getter ,temp-y ,temp-x 0)
(aref ,getter ,temp-y ,temp-x 1)))
(3
(values
(aref ,getter ,temp-y ,temp-x 0)
(aref ,getter ,temp-y ,temp-x 1)
(aref ,getter ,temp-y ,temp-x 2)))
(4
(values
(aref ,getter ,temp-y ,temp-x 0)
(aref ,getter ,temp-y ,temp-x 1)
(aref ,getter ,temp-y ,temp-x 2)
(aref ,getter ,temp-y ,temp-x 3)))
(t (values-list
(loop for i below d
collect (aref ,getter ,temp-y ,temp-x i)))))))
(2 (aref ,getter ,temp-y ,temp-x))))))))))
(defmacro pixel (image-var y x &environment env)
"Returns the (possibly multiple) image intensity value(s) at
position y, x. With proper type declarations for images, use of this
macro should yield non-consing access to image intensity data. "
(let ((image-dimensions (%get-image-dimensions image-var env)))
(if image-dimensions
(progn
(ecase (length image-dimensions)
(2 `(aref ,image-var ,y ,x))
(3 `(values ,@(loop for i below (third image-dimensions)
collect `(aref ,image-var ,y ,x ,i))))))
`(ecase (array-rank ,image-var)
(2 (aref ,image-var ,y ,x))
(3 (ecase (array-dimension ,image-var 2)
(1 (values
(aref ,image-var ,y ,x 0)))
(2 (values
(aref ,image-var ,y ,x 0)
(aref ,image-var ,y ,x 1)))
(3 (values
(aref ,image-var ,y ,x 0)
(aref ,image-var ,y ,x 1)
(aref ,image-var ,y ,x 2)))
(4 (values
(aref ,image-var ,y ,x 0)
(aref ,image-var ,y ,x 1)
(aref ,image-var ,y ,x 2)
(aref ,image-var ,y ,x 3)))))))))
(defun pixel* (image y x)
"pixel* returns the value(s) at position y, x as a list. This
function conses, but occasionally one wants the image intensity values
as a list, rather than as multiple values. This is a convenience
function to provide this, largely to provide symmetry
with (setf (pixel* ...) ...)"
(multiple-value-list (pixel image y x)))
(defmacro set-pixel* (image y x list)
`(setf (pixel ,image ,y ,x) (values-list ,list)))
(defsetf pixel* set-pixel*
"(setf (pixel* img y x) list) sets the values of pixel y, x in img
to the values contained in list. (setf (pixel ...) ...) is the more
efficient way to do this, but if one wants to pass a set of values as
a list instead of as multiple-values (for named colors perhaps), this
function does that.")
;; Note: CLH 2016-08-21
;;
;; We used to gensym a channels variable that could be used without
;; passsing it into with-image-bounds. That was a bad idea and by not
;; setting channels, we don't try to take the array-dimension that the
;; compiler might know does not exist. Also, channels should really be
;; named sosmething like num-channels.
;;
(defmacro with-image-bounds ((ymax-var xmax-var &optional channels) img
&body body
&environment env)
(let ((image-dimensions (%get-image-dimensions img env)))
`(let ((,ymax-var (array-dimension ,img 0))
(,xmax-var (array-dimension ,img 1))
,@(when channels
`((,channels ,(when (or (not image-dimensions)
(> (length image-dimensions) 2))
`(when (= (array-rank ,img) 3)
(array-dimension ,img 2)))))))
(declare ,@(when channels
`((ignorable ,channels)))
(type fixnum ,ymax-var)
(type fixnum ,xmax-var))
,@body)))
(defmacro do-pixels ((i-var j-var) image &body body)
(alexandria:with-gensyms (height width)
`(with-image-bounds (,height ,width)
,image
(loop for ,i-var fixnum below ,height
do (loop for ,j-var fixnum below ,width
do ,@body)))))
(defmacro set-pixels ((i-var j-var) image &body body)
(alexandria:with-gensyms (height width)
`(with-image-bounds (,height ,width)
,image
(loop for ,i-var fixnum below ,height
do (loop for ,j-var fixnum below ,width
do (setf (pixel ,image ,i-var ,j-var)
(progn ,@body)))))))
(defmacro do-region-pixels ((i-var j-var y1 x1 y2 x2) image &body body)
(declare (ignorable image))
`(loop for ,i-var fixnum from ,y1 below ,y2
do (loop for ,j-var fixnum from ,x1 below ,x2
do ,@body)))
(defmacro set-region-pixels ((i-var j-var y1 x1 y2 x2) image &body body)
(declare (ignorable image))
`(loop for ,i-var fixnum from ,y1 below ,y2
do (loop for ,j-var fixnum from ,x1 below ,x2
do (setf (pixel ,image ,i-var ,j-var)
(progn
,@body)))))
(defun clear-image (image)
(with-image-bounds (height width channels)
image
(declare (ignore height width))
(if channels
(ecase channels
(2 (set-pixels (i j) image (values 0 0)))
(3 (set-pixels (i j) image (values 0 0 0)))
(4 (set-pixels (i j) image (values 0 0 0 0))))
(set-pixels (i j) image 0)))
image)
(defun copy-array (src &key (element-type (array-element-type src))
(fill-pointer (and (array-has-fill-pointer-p src)
(fill-pointer src)))
(adjustable (adjustable-array-p src)))
"Returns an undisplaced copy of ARRAY, with same fill-pointer and
adjustability (if any) as the original, unless overridden by the keyword
arguments."
(let ((dims (array-dimensions src)))
;; Dictionary entry for ADJUST-ARRAY requires adjusting a
;; displaced array to a non-displaced one to make a copy.
(let* ((src-displaced (make-array (reduce #'* dims)
:displaced-to src
:element-type element-type))
(dest (make-array dims :element-type element-type
:fill-pointer fill-pointer
:adjustable adjustable))
(dest-displaced (make-array (reduce #'* dims)
:displaced-to dest
:element-type element-type)))
(replace dest-displaced src-displaced)
dest)))