togif: -E flag to read animation from stdin

[plan9front.git] / sys / src / cmd / jpg / togif.c

diff --git a/sys/src/cmd/jpg/togif.c b/sys/src/cmd/jpg/togif.c
index 353368830bde7fb757e2a4d8c17597defbe08f7a..2a5e186274c1b9a421aa9a6a9e209af01d811eb3 100644 (file)
--- a/sys/src/cmd/jpg/togif.c
+++ b/sys/src/cmd/jpg/togif.c
@@ -9,7 +9,7 @@
 void
 usage(void)
 {
-       fprint(2, "usage: togif [-l loopcount] [-c 'comment'] [-d Δt (ms)] [-t transparency-index] [file ... [-d Δt] file ...]\n");
+       fprint(2, "usage: togif [-l loopcount] [-c 'comment'] [-d Δt (ms)] [-t transparency-index] [file ... [-d Δt] file ... | -E]\n");
        exits("usage");
 }
 
@@ -20,7 +20,7 @@ main(int argc, char *argv[])
 {
        Biobuf bout;
        Memimage *i, *ni;
-       int fd, j, dt, trans, loop;
+       int fd, j, dt, trans, loop, eof;
        char buf[256];
        char *err, *comment, *s;
 
@@ -28,6 +28,7 @@ main(int argc, char *argv[])
        dt = -1;
        trans = -1;
        loop = UNSET;
+       eof = 0;
        ARGBEGIN{
        case 'l':
                s = ARGF();
@@ -54,6 +55,9 @@ main(int argc, char *argv[])
                if(trans > 255)
                        usage();
                break;
+       case 'E':
+               eof++;
+               break;
        default:
                usage();
        }ARGEND
@@ -65,7 +69,34 @@ main(int argc, char *argv[])
 
        err = nil;
 
-       if(argc == 0){
+       if(eof){
+               if(argc != 0) usage();
+               for(j = 0;;j++){
+                       i = readmemimage(0);
+                       if(i == nil) break;
+                       ni = memonechan(i);
+                       if(ni == nil)
+                               sysfatal("converting image to RGBV: %r");
+                       if(i != nil){
+                               freememimage(i);
+                               i = ni;
+                       }
+                       if(j == 0){
+                               err = memstartgif(&bout, i, loop);
+                               if(err != nil)
+                                       break;
+                       }
+                       if(comment)
+                               err = memwritegif(&bout, i, comment, dt, trans);
+                       else{
+                               snprint(buf, sizeof buf, "Converted by Plan 9 from <stdin>");
+                               err = memwritegif(&bout, i, buf, dt, trans);
+                       }
+                       if(err != nil) break;
+                       freememimage(i);
+                       comment = nil;
+               }
+       }else if(argc == 0){
                i = readmemimage(0);
                if(i == nil)
                        sysfatal("reading input: %r");