code wiki / _hdl_build / nx_gif_dump.nx
nx_gif_dump.nx source
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1// nx_gif_dump.nx -- probe: decode a GIF through the DISPLAY entry (gif_decode_rgb) and write the
2// raw RGB to _build/gif_ours.rgb for diffing against _ops/gif_ref.py. license_tier: ORIGINAL
3import "nx_syscalls.nx"
4import "nx_gif_decode.nx"
5
6func pw(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 }
7func pn(v: i64) -> i64 { let b: *u8=sys_mmap(28); var m: i64=v; if m<0{pw("-\x00" as *u8);m=0-m} let t: *u8=sys_mmap(28); var k: i64=0; if m==0{t[0]=48 as u8;k=1} while m>0{t[k]=(48+(m%10)) as u8;m=m/10;k=k+1} var i: i64=0; while i<k{b[i]=t[k-1-i];i=i+1} sys_write(1,b,k); return 0 }
8
9func main(argc: i64, argv: *i64) -> i64 {
10 if argc < 2 { pw("usage: nx_gif_dump <gif>\n\x00" as *u8); sys_exit(2) }
11 let lp: *i64 = sys_mmap(16) as *i64
12 let raw: *u8 = sys_read_file(argv[1] as *u8, lp)
13 if (raw as i64) == 0 { pw("READ-FAIL\n\x00" as *u8); sys_exit(2) }
14 let wh: *i64 = sys_mmap(16) as *i64
15 let rgb: *u8 = gif_decode_rgb(raw, lp[0], wh)
16 if (rgb as i64) == 0 { pw("DECLINE\n\x00" as *u8); sys_exit(3) }
17 let fd: i64 = sys_openat_wr("_build/gif_ours.rgb\x00" as *u8, 420)
18 if fd < 0 { sys_exit(4) }
19 sys_write(fd, rgb, wh[0] * wh[1] * 3)
20 sys_close(fd)
21 pw("DECODED w=\x00" as *u8); pn(wh[0])
22 pw(" h=\x00" as *u8); pn(wh[1])
23 pw("\n\x00" as *u8)
24 sys_exit(0)
25 return 0
26}