nx_image_symmetry_lib.nx source

1// nx_image_symmetry_lib.nx -- shared ImageBeauty core (NO main), so both the nx_image_beauty tool AND the nx_gen_rank 2// tool score with ONE source of truth (OO/DRY, per the consolidate-via-atlas directive). go_image_symmetry = the 3// objective_beauty.py _bilateral_symmetry integer port on the proven nx_png_decode. Object model: companion_arch.md. 4// license_tier: ORIGINAL 5import "nx_syscalls.nx" 6import "nx_png_decoder.nx" 7const K_MAGIC_1024: i64 = 1024 8 9func ib_itoa(dst: *u8, off: i64, v: i64) -> i64 { let t: *u8=sys_mmap(28); var m: i64=v; var neg: i64=0; if m<0 {neg=1; m=0-m} 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 o: i64=off; if neg==1 {dst[o]=45 as u8; o=o+1} var q: i64=k-1; while q>=0{dst[o]=t[q];o=o+1;q=q-1} return o } 10func ib_cat(dst: *u8, off: i64, s: *u8) -> i64 { var o: i64=off; var i: i64=0; while s[i]!=(0 as u8){dst[o]=s[i]; o=o+1; i=i+1} return o } 11 12// bilateral symmetry Q1000 (1000 = perfect mirror). returns -1 decode-null, -2 decode-error. 13func go_image_symmetry(png: *u8, plen: i64) -> i64 { 14 let r: *NxPngResult = nx_png_decode(png, plen) 15 if (r as i64) == 0 { return 0 - 1 } 16 if r.error_code != NX_PNG_OK { return 0 - 2 } 17 let w: i64 = r.header.width 18 let h: i64 = r.header.height 19 let ch: i64 = r.n_channels 20 let px: *u8 = r.pixels 21 if w < 2 { return 1000 } 22 var totaldiff: i64 = 0; var count: i64 = 0 23 let half: i64 = w / 2 24 var y: i64 = 0 25 while y < h { 26 var x: i64 = 0 27 while x < half { 28 let xr: i64 = w - 1 - x 29 var c: i64 = 0 30 while c < ch { 31 var a: i64 = px[(y*w+x)*ch+c] & 0xff 32 var b: i64 = px[(y*w+xr)*ch+c] & 0xff 33 var d: i64 = a - b; if d < 0 { d = 0 - d } 34 totaldiff = totaldiff + d; count = count + 1 35 c = c + 1 36 } 37 x = x + 1 38 } 39 y = y + 1 40 } 41 if count == 0 { return 1000 } 42 let meandiff: i64 = totaldiff / count 43 var score: i64 = 1000 - meandiff * 1000 / 80 44 if score < 0 { score = 0 } 45 return score 46} 47// score a gallery image BY CID (traversal-safe: fixed prefix + [A-Za-z0-9-] cid + .png). returns Q1000, or <0 on error. 48func go_score_cid(cid: *u8) -> i64 { 49 let path: *u8 = sys_mmap(K_MAGIC_1024); var po: i64 = ib_cat(path, 0, "/volume1/ai/gen/blob-" as *u8) 50 var ci: i64 = 0 51 while cid[ci]!=(0 as u8) { 52 let c: i64 = cid[ci]&0xff 53 var ok: i64 = 0 54 if c>=48 { if c<=57 { ok=1 } } 55 if c>=65 { if c<=90 { ok=1 } } 56 if c>=97 { if c<=122 { ok=1 } } 57 if c==45 { ok=1 } 58 if ok==1 { if po < 1000 { path[po]=cid[ci]; po=po+1 } } 59 ci=ci+1 60 } 61 po = ib_cat(path, po, ".png" as *u8); path[po]=0 as u8 62 let lp: *i64 = sys_mmap(16) as *i64 63 let png: *u8 = sys_read_file(path, lp) 64 if (png as i64) == 0 { return 0 - 3 } 65 return go_image_symmetry(png, lp[0]) 66}