(dump_image): If FILTER is "-", print the image to

stdout.

diff --git a/example/mdump.c b/example/mdump.c
index 3a5bfad..76c8416 100644 (file)
--- a/example/mdump.c
+++ b/example/mdump.c
@@ -88,6 +88,8 @@
     So, the default behaviour is the same as specifying "cat >
     %s.png" as FILTER.
 
+    If FILTER is just "-", the PNG image is written to stdout.
+
     <li> -a
 
     Enable anti-alias drawing.
@@ -184,6 +186,8 @@
     ¤Î¥Ù¡¼¥¹¥Í¡¼¥à¤ËÃÖ¤­´¹¤¨¤é¤ì¤ë¡£¤³¤Î¥×¥í¥°¥é¥à¤Î¥Ç¥Õ¥©¥ë¥È¤Î¿¶Éñ¤¤
     ¤È¡¢FILTER ¤Ë "cat > %s.png" ¤ò»ØÄꤷ¤¿¾ì¹ç¤Î¿¶Éñ¤ÏƱ°ì¤Ç¤¢¤ë¡£
 
+    ¤â¤· FILTER ¤¬Ã±¤Ë "-" ¤Ç¤¢¤ì¤Ð¡¢ PNG ²èÁü¤Ï stdout ¤Ë½ÐÎϤµ¤ì¤ë¡£
+
     <li> -a
 
     ¥¢¥ó¥Á¥¨¥¤¥ê¥¢¥¹½èÍý¤ò¹Ô¤¦¡£
@@ -388,14 +392,19 @@ dump_image (gdImagePtr image, char *filename, char *filter,
 
   if (filter)
     {
-      char *command = alloca (strlen (filename) + strlen (filter) + 1);
+      if (filter[0] == '-' && filter[1] == '\0')
+       fp = stdout;
+      else
+       {
+         char *command = alloca (strlen (filename) + strlen (filter) + 1);
 
-      sprintf (command, filter, filename);
-      fp = popen (command, "w");
-      if (! fp)
-       FATAL_ERROR ("Can't run the command \"%s\"\n", command);
-      if (! quiet_mode)
-       printf ("Running \"%s\" ... ", command);
+         sprintf (command, filter, filename);
+         fp = popen (command, "w");
+         if (! fp)
+           FATAL_ERROR ("Can't run the command \"%s\"\n", command);
+         if (! quiet_mode)
+           printf ("Running \"%s\" ... ", command);
+       }
     }
   else
     {
@@ -411,7 +420,8 @@ dump_image (gdImagePtr image, char *filename, char *filter,
 
   /* Generate PNG.  */
   gdImagePng (image, fp);
-  fclose (fp);
+  if (fp != stderr)
+    fclose (fp);
   if (! quiet_mode)
     printf (" done (%dx%d)\n", image->sx, image->sy);
 }