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original commit: dc78e0ac1f66687158c3c4d7c26b71595adec1fd

collects/mrlib/bitmap-constant.ss

@@ -0,0 +1,99 @@
+(module bitmap-constant mzscheme
+  (require (lib "mred.ss" "mred")
+	   (lib "class.ss")
+	   (lib "file.ss"))
+  (require-for-syntax (lib "stx.ss" "syntax"))
+
+  (provide bitmap-constant)
+
+  (define-syntax (bitmap-constant stx)
+    (syntax-case stx ()
+      [(_ floc)
+       (let* ([loc #'floc]
+	      [file 
+	       (syntax-case* loc (lib build-path) module-or-top-identifier=?
+		 [_
+		  (and (string? (syntax-e loc))
+		       (or (relative-path? (syntax-e loc))
+			   (absolute-path? (syntax-e loc))))
+		  (syntax-e loc)]
+		 [(build-path elem1 elem ...)
+		  (apply build-path (syntax-object->datum (syntax (elem1 elem ...))))]
+		 [(lib filename coll ...)
+		  (let ([l (syntax-object->datum (syntax (filename coll ...)))])
+		    (unless (andmap string? l)
+		      (raise-syntax-error
+		       #f
+		       "`lib' keyword is not followed by a sequence of string datums"
+		       stx
+		       loc))
+		    (build-path (if (null? (cdr l))
+				    (collection-path "mzlib")
+				    (apply collection-path (cdr l)))
+				(car l)))]
+		 [else
+		  (raise-syntax-error
+		   #f
+		   "not a pathname string, `build-path' form, or `lib' form for file"
+		   stx
+		   loc)])]
+	      [c-file
+	       (if (complete-path? file)
+		   file
+		   (path->complete-path
+		    file
+		    (cond
+		     ;; Src of include expression is a path?
+		     [(and (string? (syntax-source loc))
+			   (complete-path? (syntax-source loc)))
+		      (let-values ([(base name dir?) 
+				    (split-path (syntax-source loc))])
+			(if dir?
+			    (syntax-source loc)
+			    base))]
+		     ;; Load relative?
+		     [(current-load-relative-directory)]
+		     ;; Current directory
+		     [(current-directory)]
+		     [else (raise-syntax-error
+			    #f
+			    "can't determine a base path"
+			    stx)])))])
+	 (let ([content
+		(with-handlers ([not-break-exn?
+				 (lambda (exn)
+				   (error 'bitmap-constant
+					  "could not load ~e: ~a"
+					  c-file
+					  (if (exn? exn)
+					      (exn-message exn)
+					      (format "~e" exn))))])
+		  (with-input-from-file c-file
+		    (lambda ()
+		      (read-string (file-size c-file)))))])
+	   (with-syntax ([content content]
+			 [c-file c-file])
+	     (syntax/loc stx
+	       (get-or-load-bitmap-constant content c-file)))))]))
+
+  (define cached (make-hash-table 'equal))
+
+  (define (get-or-load-bitmap-constant content orig)
+    (hash-table-get cached content
+		    (lambda ()
+		      (let ([bm (let ([fn (make-temporary-file)])
+				  (dynamic-wind
+				      void
+				      (lambda ()
+					(with-output-to-file fn
+					  (lambda () (display content))
+					  'truncate)
+					(make-object bitmap% fn 'unknown/mask))
+				      (lambda ()
+					(delete-file fn))))])
+			(unless (send bm ok?)
+			  (error 'bitmap-constant
+				 "unable to parse image, originated from: ~a"
+				 orig))
+			(hash-table-put! cached content bm)
+			bm)))))