ref: d71d5fc296e01ce3c2189087c5ff190676b7564f
parent: 75872eff709f3d02bac21f1943f7432be7654ebb
author: Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com>
date: Wed Jan 20 04:03:29 EST 2021
forgot to add convert.c; update readme
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@
save it as `b.img`.
"Channels" (`-c` argument) are defined at `/sys/include/draw.h:133`.
+`rgb16`, `RGB16`, `r5g6b5` and `R5G6B5` mean the same thing
+(case-insensitive).
## resample
--- /dev/null
+++ b/convert.c
@@ -1,0 +1,72 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <memdraw.h>
+
+static struct {+ char *name[2];
+ ulong chan;
+}chans[] = {+ {{"grey1", "k1"}, GREY1},+ {{"grey2", "k2"}, GREY2},+ {{"grey4", "k4"}, GREY4},+ {{"grey8", "k8"}, GREY8},+ {{"cmap8", "m8"}, CMAP8},+ {{"rgb15", "x1r5g5b5"}, RGB15},+ {{"rgb16", "r5g6b5"}, RGB16},+ {{"rgb24", "r8g8b8"}, RGB24},+ {{"rgba32", "r8g8b8a8"}, RGBA32},+ {{"argb32", "a8r8g8b8"}, ARGB32},+ {{"xrgb32", "x8r8g8b8"}, XRGB32},+ {{"bgr24", "b8g8r8"}, BGR24},+ {{"abgr32", "a8b8g8r8"}, ABGR32},+ {{"xbgr32", "x8b8g8r8"}, XBGR32},+};
+
+static void
+usage(void)
+{+ fprint(2, "usage: %s [-c CHAN]\n", argv0);
+ exits("usage");+}
+
+void
+main(int argc, char **argv)
+{+ Memimage *a, *b;
+ char *s;
+ int ci;
+
+ ci = -1;
+ ARGBEGIN{+ case 'c':
+ s = EARGF(usage());
+ for(ci = 0;
+ ci < nelem(chans) &&
+ cistrcmp(chans[ci].name[0], s) != 0 &&
+ cistrcmp(chans[ci].name[1], s) != 0;
+ ci++)
+ ;
+ if(ci >= nelem(chans)){+ fprint(2, "invalid chan %s\n", s);
+ sysfatal("chan");+ }
+ break;
+ default:
+ usage();
+ }ARGEND
+
+ memimageinit();
+ if((a = readmemimage(0)) == nil)
+ sysfatal("memory");+ if(ci >= 0 && a->chan != chans[ci].chan){+ if((b = allocmemimage(a->r, chans[ci].chan)) == nil)
+ sysfatal("memory");+ memimagedraw(b, a->r, a, ZP, nil, ZP, S);
+ freememimage(a);
+ a = b;
+ }
+ writememimage(1, a);
+
+ exits(nil);
+}