code wiki / _hdl_build / nx_struct_diff.nx

nx_struct_diff.nx

buildroot/runtime/_hdl_build/nx_struct_diff.nx

4666 B107 linesdepth 9pulls 12 transitivereach 0 importersview sourcekind tool
docsdependenciesstructsconstsfunctions

about

nx_struct_diff.nx -- STRUCTURAL exactness differ (the operator ratchet's metric, 2026-07-28): extracts TEXT-LINE BANDS (consecutive inky rows) from two screenshots of the same page region (oracle vs nishi), matches bands by vertical proximity, and reports the numbers OCR cannot see: band counts, matched permille, mean |dy| (vertical drift), mean |dx| (line-start drift). Exact structural match (the bar) = matched 1000 with dy/dx ~ 0; every miss is a nameable layout defect. usage: nx_struct_diff <oracle.png> <nishi.png> <ay> <by> <h>

dependencies 2 imports · 0 importers

nx_syscalls.nx nx_visual_diff.nx nx_struct_diff.nx

imports: nx_syscalls.nxnx_visual_diff.nx

imported by: nobody (leaf or entry point)

call flow from main pre-order; caps 40 nodes / depth 6 declared; ↻ = already shown

main sdw sys_write sys_exit vd_load sys_mmap sys_read_file sys_openat_rd sys_lseek sys_mmap ↻ sys_read sys_close nx_png_decode sys_mmap ↻ _png_check_signature _png_read_u32_be nx_crc32 nx_crc32_update nx_crc32_init nx_crc32_table_at _png_n_channels _png_bytes_per_pixel _png_n_channels ↻ _png_a7_expected _png_a7_col0 _png_a7_coli _png_a7_row0 _png_a7_rowi nx_zlib_inflate sys_mmap ↻ nx_deflate_inflate sys_mmap ↻ nx_bitstream_alloc sys_mmap ↻ _deflate_inflate_block nx_bitstream_read_lsb nx_bitstream_byte_align nx_bitstream_read_byte_ali _deflate_build_static_litl _deflate_build_static_dist

structs

none

consts

9const SD_MAGIC_100000: i64 = 100000
15const SD_MAXBANDS: i64 = 2048

functions

11func sdw(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 }
called by 2: sdnmain calls 1: sys_write
12func sdn(v: i64) -> i64 { let b: *u8=sys_mmap(28); var m: i64=v; if m<0{sdw("-" 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 }
called by 1: main calls 3: sys_mmapsdwsys_write
13func sd_atoi(s: *u8) -> i64 { var v: i64=0; var i: i64=0; while (s[i]&0xff)>=48 { if (s[i]&0xff)<=57 { v=v*10+((s[i]&0xff)-48); i=i+1 } else { return v } } return v }
called by 1: main
18func sd_bands(im: *VdImg, off: i64, h: i64, ymid: *i64, xs: *i64) -> i64
called by 1: main
52func main(argc: i64, argv: *i64) -> i64
calls 7: sdwsys_exitvd_loadsd_atoisys_mmapsd_bands+1