adapt better to available drawing and GUI libraries on Unix variants

collects/mred/private/wx/gtk/utils.rkt

@@ -56,19 +56,19 @@
      (ffi-lib "libgio-2.0-0")
      (ffi-lib "libgdk_pixbuf-2.0-0")
      (ffi-lib "libgdk-win32-2.0-0")]
-    [else (ffi-lib "libgdk-x11-2.0" '("0"))]))
+    [else (ffi-lib "libgdk-x11-2.0" '("0" ""))]))
 (define gdk_pixbuf-lib 
   (case (system-type)
     [(windows)
      (ffi-lib "libgdk_pixbuf-2.0-0")]
     [(unix)
-     (ffi-lib "libgdk_pixbuf-2.0" '("0"))]
+     (ffi-lib "libgdk_pixbuf-2.0" '("0" ""))]
     [else gdk-lib]))
 (define gtk-lib
   (case (system-type)
     [(windows) 
      (ffi-lib "libgtk-win32-2.0-0")]
-    [else (ffi-lib "libgtk-x11-2.0" '("0"))]))
+    [else (ffi-lib "libgtk-x11-2.0" '("0" ""))]))
 
 (define-ffi-definer define-gtk gtk-lib)
 (define-ffi-definer define-gdk gdk-lib)

collects/racket/draw/unsafe/cairo.rkt

@@ -7,7 +7,7 @@
          "../private/utils.rkt")
 
 (define-runtime-lib cairo-lib
-  [(unix) (ffi-lib "libcairo" '("2"))]
+  [(unix) (ffi-lib "libcairo" '("2" ""))]
   [(macosx) 
    (ffi-lib "libpixman-1.0.dylib")
    (ffi-lib "libpng14.14.dylib")

collects/racket/draw/unsafe/glib.rkt

@@ -9,12 +9,12 @@
           define-gobj))
 
 (define-runtime-lib glib-lib 
-  [(unix) (ffi-lib "libglib-2.0" '("0"))]
+  [(unix) (ffi-lib "libglib-2.0" '("0" ""))]
   [(macosx) (ffi-lib "libglib-2.0.0")]
   [(windows) (ffi-lib "libglib-2.0-0.dll")])
 
 (define-runtime-lib gmodule-lib 
-  [(unix) (ffi-lib "libgmodule-2.0" '("0"))]
+  [(unix) (ffi-lib "libgmodule-2.0" '("0" ""))]
   [(macosx) 
    (ffi-lib "libgmodule-2.0.0.dylib")]
   [(win32) 
@@ -24,7 +24,7 @@
    (ffi-lib "libgmodule-2.0-0.dll")])
 
 (define-runtime-lib gobj-lib 
-  [(unix) (ffi-lib "libgobject-2.0" '("0"))]
+  [(unix) (ffi-lib "libgobject-2.0" '("0" ""))]
   [(macosx) (ffi-lib "libgobject-2.0.0")]
   [(windows) (ffi-lib "libgobject-2.0-0.dll")])
 

collects/racket/draw/unsafe/jpeg.rkt

@@ -8,22 +8,13 @@
          "../private/utils.rkt"
          "../private/libs.rkt")
 
-(define-runtime-lib jpeg-lib 
+(define-runtime-lib jpeg-lib
   [(unix) (ffi-lib "libjpeg" '("62" ""))]
   [(macosx) 
    ;; for PPC, it's actually version 8!
    (ffi-lib "libjpeg.62.dylib")]
   [(windows) (ffi-lib "libjpeg-7.dll")])
 
-(define JPEG_LIB_VERSION
-  (case (system-type)
-    [(macosx) (if (string=? "ppc-macosx" 
-                            (path->string (system-library-subpath #f)))
-                  80
-                  62)]
-    [(unix) 62]
-    [(windows) 70]))
-
 (define-ffi-definer define-jpeg jpeg-lib
   #:provide provide)
 (define-ffi-definer define-jpeg/private jpeg-lib)
@@ -70,19 +61,58 @@
                                   ;; and more
                                   ))
 
+(define-cstruct _jpeg_any_struct ([err _jpeg_error_mgr-pointer]))
+
+(define (error-exit m) 
+  (let ([bstr (make-bytes JMSG_LENGTH_MAX)])
+    ((jpeg_error_mgr-format_message
+      (jpeg_any_struct-err (cast m _pointer _jpeg_any_struct-pointer)))
+     m
+     bstr)
+    (error 'jpeg "~a" (bytes->string/latin-1 (subbytes bstr 0 (let loop ([i 0])
+                                                                (if (zero? (bytes-ref bstr i))
+                                                                    i
+                                                                    (loop (add1 i)))))))))
+
+(define-jpeg/private jpeg_std_error (_fun _jpeg_error_mgr-pointer -> _jpeg_error_mgr-pointer))
+
+(define-jpeg/private jpeg_CreateDecompress/test (_fun _pointer _int _int -> _void)
+  #:c-id jpeg_CreateDecompress)
+
+;; jpeglib offers no way to get the library version number dynamically,
+;; so we hack it by intercepting an error from jpeg_CreateDecompress:
+(define JPEG_LIB_VERSION
+  (let ([dummy-size 4096])
+    (let ([m (cast (malloc dummy-size 'raw) _pointer _jpeg_any_struct-pointer)]
+          [e (cast (malloc sizeof_jpeg_error_mgr 'raw) _pointer _jpeg_error_mgr-pointer)])
+      (set-jpeg_any_struct-err! m (jpeg_std_error e))
+      (set-jpeg_error_mgr-error_exit! e error-exit)
+      (let ([s (with-handlers ([exn:fail? (lambda (exn) (exn-message exn))])
+                 (jpeg_CreateDecompress/test m 0 dummy-size)
+                 "")])
+        (free m)
+        (free e)
+        (let ([m (regexp-match #rx"version: library is ([0-9]+)" s)])
+          (if m
+              (string->number (cadr m))
+              "unknown"))))))
+
+(unless (member JPEG_LIB_VERSION '(62 64 70 80))
+  (error 'jpeg "unsupported library version: ~e" JPEG_LIB_VERSION))
+
 (define _scaled_size
   (case JPEG_LIB_VERSION
-    [(62) _int]
+    [(62 64) _int]
     [else (make-cstruct-type (list _int _int))]))
 
 (define _prog_scan_size
   (case JPEG_LIB_VERSION
-    [(62 70) (make-cstruct-type (list _int _int _int _int))]
+    [(62 64 70) (make-cstruct-type (list _int _int _int _int))]
     [else (make-cstruct-type (list _int _int _int _int _int _pointer _int))]))
 
 (define _comp_info_size
   (case JPEG_LIB_VERSION
-    [(62 70) _pointer]
+    [(62 64 70) _pointer]
     [else (make-cstruct-type (list _pointer _jbool))]))
 
 (define-cstruct _jpeg_decompress_struct ([err _jpeg_error_mgr-pointer]
@@ -294,7 +324,7 @@
 					   [data_precision _int]))
 (define _compression_params_t
   (case JPEG_LIB_VERSION
-    [(62) _int] ; just data_precission
+    [(62 64) _int] ; just data_precission
     [else _jpeg7_compression_params]))
 
 (define-cstruct _quant_tbl_62_t ([quant_tbl_ptrs_1 _pointer]
@@ -308,12 +338,12 @@
 
 (define _quant_tbl_t
   (case JPEG_LIB_VERSION
-    [(62) _quant_tbl_62_t]
+    [(62 64) _quant_tbl_62_t]
     [else _quant_tbl_70_t]))
 
 (define _sampling_t
   (case JPEG_LIB_VERSION
-    [(62) _jbool] ; just CCIR601_sampling
+    [(62 64) _jbool] ; just CCIR601_sampling
     [else (make-cstruct-type (list _jbool _jbool))])) ; CCIR601_sampling and do_fancy_downsampling
 
 (define-cstruct _factors_62_t ([max_h_samp_factor _int]
@@ -321,7 +351,7 @@
 (define-cstruct (_factors_70_t _factors_62_t) ([scaled _scaled_size]))
 (define _factors_t
   (case JPEG_LIB_VERSION
-    [(62) _factors_62_t]
+    [(62 64) _factors_62_t]
     [else _factors_70_t]))
 
 
@@ -551,17 +581,6 @@
     (let ([in (ptr-ref (jpeg_decompress_struct-client_data m) _scheme)])
       (close-input-port in))))
 
-(define (error-exit m) 
-  (let ([bstr (make-bytes JMSG_LENGTH_MAX)])
-    ((jpeg_error_mgr-format_message
-      (jpeg_decompress_struct-err (ptr-cast m _jpeg_decompress_struct-pointer)))
-     m
-     bstr)
-    (error 'jpeg "~a" (bytes->string/latin-1 (subbytes bstr 0 (let loop ([i 0])
-                                                                (if (zero? (bytes-ref bstr i))
-                                                                    i
-                                                                    (loop (add1 i)))))))))
-
 (define (ptr-cast p t) (cast p _pointer t))
 
 (define destroy-decompress
@@ -634,8 +653,6 @@
                 1)])
     (values samps (scheme_make_sized_byte_string (ptr-ref samps _pointer) len 0))))
 
-(define-jpeg/private jpeg_std_error (_fun _jpeg_error_mgr-pointer -> _jpeg_error_mgr-pointer))
-
 (define-jpeg/private jpeg_CreateDecompress (_fun _j_decompress_ptr _int _int -> _void))
 (define-jpeg/private jpeg_resync_to_restart (_fun _j_decompress_ptr _int -> _jbool))
 (define-jpeg jpeg_read_header (_fun _j_decompress_ptr _jbool -> _void))

collects/racket/draw/unsafe/pango.rkt

@@ -10,7 +10,7 @@
          "../private/libs.rkt")
 
 (define-runtime-lib pango-lib 
-  [(unix) (ffi-lib "libpango-1.0" '("0"))]
+  [(unix) (ffi-lib "libpango-1.0" '("0" ""))]
   [(macosx) 
    (ffi-lib "libintl.8.dylib")
    (ffi-lib "libpango-1.0.0.dylib")]
@@ -24,7 +24,7 @@
    (ffi-lib "libpangowin32-1.0-0.dll")])
 
 (define-runtime-lib pangocairo-lib 
-  [(unix) (ffi-lib "libpangocairo-1.0" '("0"))]
+  [(unix) (ffi-lib "libpangocairo-1.0" '("0" ""))]
   [(macosx)
    (ffi-lib "libpangocairo-1.0.0.dylib")]
   [(win32) 

collects/racket/draw/unsafe/png.rkt

@@ -10,10 +10,11 @@
 
 (define-runtime-lib png-lib 
   [(unix) 
-   (case (string->symbol (path->string (system-library-subpath #f)))
-     [(i386-freebsd) (ffi-lib "libpng")]
-     [else
-      (ffi-lib "libpng12" '("0" ""))])]
+   ;; Most Linux distros supply "libpng12", while other Unix
+   ;; variants often have just "libpng":
+   (with-handlers ([exn:fail:filesystem?
+                    (lambda (exn) (ffi-lib "libpng"))])
+     (ffi-lib "libpng12" '("0" "")))]
   [(macosx) (ffi-lib "libpng14.14.dylib")]
   [(windows) 
    (ffi-lib "zlib1.dll")