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FA-52331 / Raster memory layout / Open access

Field Separated Scanlines: Field pixel address loses byte width or mirrors horizontal order · case 01

The returned physical layout descriptor disagrees with the declared buffer mapping at address.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Field pixel address loses byte width or mirrors horizontal order The faulty expression is row_origin+p["x"].

THE FAILURE

Field pixel address loses byte width or mirrors horizontal order The faulty expression is row_origin+p["x"].

Unsuccessful approach: The attempted repair uses row_origin+(p["w"]-1-p["x"])*p["b"] and still violates the layout contract.

Case contract

Even scanlines precede odd scanlines in two separately tagged fields. Each field starts with its own three-byte tag. Field rows use a two-byte guard and store x-fastest pixels. Return the named intermediate layout descriptor and final address fields; all quantities are integer byte offsets unless explicitly stated.

Why this case matters

Offline raster resource, upload, readback, and storage-layout regression model.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(p):
    p = dict(p)
    even_rows = (p["h"]+1)//2
    odd_rows = p["h"]//2
    field = p["y"]%2
    field_row = p["y"]//2
    row_pitch = p["w"]*p["b"]+2
    odd_start = p["base"]+3+even_rows*row_pitch
    field_start = p["base"] if field==0 else odd_start
    row_origin = field_start+3+field_row*row_pitch
    address = row_origin+p["x"]
    allocation_end = odd_start+3+odd_rows*row_pitch
    return {'even_rows': even_rows, 'odd_rows': odd_rows, 'field': field, 'field_row': field_row, 'row_pitch': row_pitch, 'odd_start': odd_start, 'field_start': field_start, 'row_origin': row_origin, 'address': address, 'allocation_end': allocation_end}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 2, 'base': 11}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 4, 'odd_start': 18, 'field_start': 11, 'row_origin': 14, 'address': 14, 'allocation_end': 21}), ({'w': 6, 'h': 4, 'x': 1, 'y': 2, 'b': 2, 'base': 11}, {'even_rows': 2, 'odd_rows': 2, 'field': 0, 'field_row': 1, 'row_pitch': 14, 'odd_start': 42, 'field_start': 11, 'row_origin': 28, 'address': 30, 'allocation_end': 73}), ({'w': 10, 'h': 8, 'x': 8, 'y': 6, 'b': 2, 'base': 11}, {'even_rows': 4, 'odd_rows': 4, 'field': 0, 'field_row': 3, 'row_pitch': 22, 'odd_start': 102, 'field_start': 11, 'row_origin': 80, 'address': 96, 'allocation_end': 193}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 2, 'base': 11}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 34, 'odd_start': 150, 'field_start': 150, 'row_origin': 255, 'address': 285, 'allocation_end': 289}), ({'w': 18, 'h': 10, 'x': 16, 'y': 8, 'b': 2, 'base': 11}, {'even_rows': 5, 'odd_rows': 5, 'field': 0, 'field_row': 4, 'row_pitch': 38, 'odd_start': 204, 'field_start': 11, 'row_origin': 166, 'address': 198, 'allocation_end': 397}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 2, 'base': 11}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 16, 'odd_start': 126, 'field_start': 11, 'row_origin': 110, 'address': 116, 'allocation_end': 225})], 2: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 3, 'base': 22}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 5, 'odd_start': 30, 'field_start': 22, 'row_origin': 25, 'address': 25, 'allocation_end': 33}), ({'w': 7, 'h': 5, 'x': 1, 'y': 2, 'b': 3, 'base': 22}, {'even_rows': 3, 'odd_rows': 2, 'field': 0, 'field_row': 1, 'row_pitch': 23, 'odd_start': 94, 'field_start': 22, 'row_origin': 48, 'address': 51, 'allocation_end': 143}), ({'w': 11, 'h': 9, 'x': 8, 'y': 6, 'b': 3, 'base': 22}, {'even_rows': 5, 'odd_rows': 4, 'field': 0, 'field_row': 3, 'row_pitch': 35, 'odd_start': 200, 'field_start': 22, 'row_origin': 130, 'address': 154, 'allocation_end': 343}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 3, 'base': 22}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 50, 'odd_start': 225, 'field_start': 225, 'row_origin': 378, 'address': 423, 'allocation_end': 428}), ({'w': 19, 'h': 11, 'x': 16, 'y': 8, 'b': 3, 'base': 22}, {'even_rows': 6, 'odd_rows': 5, 'field': 0, 'field_row': 4, 'row_pitch': 59, 'odd_start': 379, 'field_start': 22, 'row_origin': 261, 'address': 309, 'allocation_end': 677}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 3, 'base': 22}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 23, 'odd_start': 186, 'field_start': 22, 'row_origin': 163, 'address': 172, 'allocation_end': 327})], 3: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 4, 'base': 33}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 6, 'odd_start': 42, 'field_start': 33, 'row_origin': 36, 'address': 36, 'allocation_end': 45}), ({'w': 8, 'h': 6, 'x': 1, 'y': 2, 'b': 4, 'base': 33}, {'even_rows': 3, 'odd_rows': 3, 'field': 0, 'field_row': 1, 'row_pitch': 34, 'odd_start': 138, 'field_start': 33, 'row_origin': 70, 'address': 74, 'allocation_end': 243}), ({'w': 12, 'h': 10, 'x': 8, 'y': 6, 'b': 4, 'base': 33}, {'even_rows': 5, 'odd_rows': 5, 'field': 0, 'field_row': 3, 'row_pitch': 50, 'odd_start': 286, 'field_start': 33, 'row_origin': 186, 'address': 218, 'allocation_end': 539}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 4, 'base': 33}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 66, 'odd_start': 300, 'field_start': 300, 'row_origin': 501, 'address': 561, 'allocation_end': 567}), ({'w': 20, 'h': 12, 'x': 16, 'y': 8, 'b': 4, 'base': 33}, {'even_rows': 6, 'odd_rows': 6, 'field': 0, 'field_row': 4, 'row_pitch': 82, 'odd_start': 528, 'field_start': 33, 'row_origin': 364, 'address': 428, 'allocation_end': 1023}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 4, 'base': 33}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 30, 'odd_start': 246, 'field_start': 33, 'row_origin': 216, 'address': 228, 'allocation_end': 429})], 4: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 5, 'base': 44}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 7, 'odd_start': 54, 'field_start': 44, 'row_origin': 47, 'address': 47, 'allocation_end': 57}), ({'w': 9, 'h': 7, 'x': 1, 'y': 2, 'b': 5, 'base': 44}, {'even_rows': 4, 'odd_rows': 3, 'field': 0, 'field_row': 1, 'row_pitch': 47, 'odd_start': 235, 'field_start': 44, 'row_origin': 94, 'address': 99, 'allocation_end': 379}), ({'w': 13, 'h': 11, 'x': 8, 'y': 6, 'b': 5, 'base': 44}, {'even_rows': 6, 'odd_rows': 5, 'field': 0, 'field_row': 3, 'row_pitch': 67, 'odd_start': 449, 'field_start': 44, 'row_origin': 248, 'address': 288, 'allocation_end': 787}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 5, 'base': 44}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 82, 'odd_start': 375, 'field_start': 375, 'row_origin': 624, 'address': 699, 'allocation_end': 706}), ({'w': 21, 'h': 13, 'x': 16, 'y': 8, 'b': 5, 'base': 44}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 4, 'row_pitch': 107, 'odd_start': 796, 'field_start': 44, 'row_origin': 475, 'address': 555, 'allocation_end': 1441}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 5, 'base': 44}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 37, 'odd_start': 306, 'field_start': 44, 'row_origin': 269, 'address': 284, 'allocation_end': 531})], 5: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 6, 'base': 55}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 8, 'odd_start': 66, 'field_start': 55, 'row_origin': 58, 'address': 58, 'allocation_end': 69}), ({'w': 10, 'h': 8, 'x': 1, 'y': 2, 'b': 6, 'base': 55}, {'even_rows': 4, 'odd_rows': 4, 'field': 0, 'field_row': 1, 'row_pitch': 62, 'odd_start': 306, 'field_start': 55, 'row_origin': 120, 'address': 126, 'allocation_end': 557}), ({'w': 14, 'h': 12, 'x': 8, 'y': 6, 'b': 6, 'base': 55}, {'even_rows': 6, 'odd_rows': 6, 'field': 0, 'field_row': 3, 'row_pitch': 86, 'odd_start': 574, 'field_start': 55, 'row_origin': 316, 'address': 364, 'allocation_end': 1093}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 6, 'base': 55}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 98, 'odd_start': 450, 'field_start': 450, 'row_origin': 747, 'address': 837, 'allocation_end': 845}), ({'w': 22, 'h': 14, 'x': 16, 'y': 8, 'b': 6, 'base': 55}, {'even_rows': 7, 'odd_rows': 7, 'field': 0, 'field_row': 4, 'row_pitch': 134, 'odd_start': 996, 'field_start': 55, 'row_origin': 594, 'address': 690, 'allocation_end': 1937}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 6, 'base': 55}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 44, 'odd_start': 366, 'field_start': 55, 'row_origin': 322, 'address': 340, 'allocation_end': 633})]}
for i, (p, expected) in enumerate(cases[N]):
    check("layout fixture " + str(i + 1), solve(p), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
layout fixture 1{'address': 14, 'allocation_end': 21, 'even_rows': 1, 'field': 0, 'field_row': 0, 'field_start': 11, 'odd_rows': 0, 'odd_start': 18, 'row_origin': 14, 'row_pitch': 4}{'address': 14, 'allocation_end': 21, 'even_rows': 1, 'field': 0, 'field_row': 0, 'field_start': 11, 'odd_rows': 0, 'odd_start': 18, 'row_origin': 14, 'row_pitch': 4}Passed
layout fixture 2{'address': 29, 'allocation_end': 73, 'even_rows': 2, 'field': 0, 'field_row': 1, 'field_start': 11, 'odd_rows': 2, 'odd_start': 42, 'row_origin': 28, 'row_pitch': 14}{'address': 30, 'allocation_end': 73, 'even_rows': 2, 'field': 0, 'field_row': 1, 'field_start': 11, 'odd_rows': 2, 'odd_start': 42, 'row_origin': 28, 'row_pitch': 14}Failed
layout fixture 3{'address': 88, 'allocation_end': 193, 'even_rows': 4, 'field': 0, 'field_row': 3, 'field_start': 11, 'odd_rows': 4, 'odd_start': 102, 'row_origin': 80, 'row_pitch': 22}{'address': 96, 'allocation_end': 193, 'even_rows': 4, 'field': 0, 'field_row': 3, 'field_start': 11, 'odd_rows': 4, 'odd_start': 102, 'row_origin': 80, 'row_pitch': 22}Failed
layout fixture 4{'address': 270, 'allocation_end': 289, 'even_rows': 4, 'field': 1, 'field_row': 3, 'field_start': 150, 'odd_rows': 4, 'odd_start': 150, 'row_origin': 255, 'row_pitch': 34}{'address': 285, 'allocation_end': 289, 'even_rows': 4, 'field': 1, 'field_row': 3, 'field_start': 150, 'odd_rows': 4, 'odd_start': 150, 'row_origin': 255, 'row_pitch': 34}Failed
layout fixture 5{'address': 182, 'allocation_end': 397, 'even_rows': 5, 'field': 0, 'field_row': 4, 'field_start': 11, 'odd_rows': 5, 'odd_start': 204, 'row_origin': 166, 'row_pitch': 38}{'address': 198, 'allocation_end': 397, 'even_rows': 5, 'field': 0, 'field_row': 4, 'field_start': 11, 'odd_rows': 5, 'odd_start': 204, 'row_origin': 166, 'row_pitch': 38}Failed
layout fixture 6{'address': 113, 'allocation_end': 225, 'even_rows': 7, 'field': 0, 'field_row': 6, 'field_start': 11, 'odd_rows': 6, 'odd_start': 126, 'row_origin': 110, 'row_pitch': 16}{'address': 116, 'allocation_end': 225, 'even_rows': 7, 'field': 0, 'field_row': 6, 'field_start': 11, 'odd_rows': 6, 'odd_start': 126, 'row_origin': 110, 'row_pitch': 16}Failed

SHA-256 / 4ea37b586369f4168817d5479b6e18dfd3ae3ee3371d6488021f61d5ac7bec30

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(p):
    p = dict(p)
    even_rows = (p["h"]+1)//2
    odd_rows = p["h"]//2
    field = p["y"]%2
    field_row = p["y"]//2
    row_pitch = p["w"]*p["b"]+2
    odd_start = p["base"]+3+even_rows*row_pitch
    field_start = p["base"] if field==0 else odd_start
    row_origin = field_start+3+field_row*row_pitch
    address = row_origin+(p["w"]-1-p["x"])*p["b"]
    allocation_end = odd_start+3+odd_rows*row_pitch
    return {'even_rows': even_rows, 'odd_rows': odd_rows, 'field': field, 'field_row': field_row, 'row_pitch': row_pitch, 'odd_start': odd_start, 'field_start': field_start, 'row_origin': row_origin, 'address': address, 'allocation_end': allocation_end}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 2, 'base': 11}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 4, 'odd_start': 18, 'field_start': 11, 'row_origin': 14, 'address': 14, 'allocation_end': 21}), ({'w': 6, 'h': 4, 'x': 1, 'y': 2, 'b': 2, 'base': 11}, {'even_rows': 2, 'odd_rows': 2, 'field': 0, 'field_row': 1, 'row_pitch': 14, 'odd_start': 42, 'field_start': 11, 'row_origin': 28, 'address': 30, 'allocation_end': 73}), ({'w': 10, 'h': 8, 'x': 8, 'y': 6, 'b': 2, 'base': 11}, {'even_rows': 4, 'odd_rows': 4, 'field': 0, 'field_row': 3, 'row_pitch': 22, 'odd_start': 102, 'field_start': 11, 'row_origin': 80, 'address': 96, 'allocation_end': 193}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 2, 'base': 11}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 34, 'odd_start': 150, 'field_start': 150, 'row_origin': 255, 'address': 285, 'allocation_end': 289}), ({'w': 18, 'h': 10, 'x': 16, 'y': 8, 'b': 2, 'base': 11}, {'even_rows': 5, 'odd_rows': 5, 'field': 0, 'field_row': 4, 'row_pitch': 38, 'odd_start': 204, 'field_start': 11, 'row_origin': 166, 'address': 198, 'allocation_end': 397}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 2, 'base': 11}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 16, 'odd_start': 126, 'field_start': 11, 'row_origin': 110, 'address': 116, 'allocation_end': 225})], 2: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 3, 'base': 22}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 5, 'odd_start': 30, 'field_start': 22, 'row_origin': 25, 'address': 25, 'allocation_end': 33}), ({'w': 7, 'h': 5, 'x': 1, 'y': 2, 'b': 3, 'base': 22}, {'even_rows': 3, 'odd_rows': 2, 'field': 0, 'field_row': 1, 'row_pitch': 23, 'odd_start': 94, 'field_start': 22, 'row_origin': 48, 'address': 51, 'allocation_end': 143}), ({'w': 11, 'h': 9, 'x': 8, 'y': 6, 'b': 3, 'base': 22}, {'even_rows': 5, 'odd_rows': 4, 'field': 0, 'field_row': 3, 'row_pitch': 35, 'odd_start': 200, 'field_start': 22, 'row_origin': 130, 'address': 154, 'allocation_end': 343}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 3, 'base': 22}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 50, 'odd_start': 225, 'field_start': 225, 'row_origin': 378, 'address': 423, 'allocation_end': 428}), ({'w': 19, 'h': 11, 'x': 16, 'y': 8, 'b': 3, 'base': 22}, {'even_rows': 6, 'odd_rows': 5, 'field': 0, 'field_row': 4, 'row_pitch': 59, 'odd_start': 379, 'field_start': 22, 'row_origin': 261, 'address': 309, 'allocation_end': 677}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 3, 'base': 22}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 23, 'odd_start': 186, 'field_start': 22, 'row_origin': 163, 'address': 172, 'allocation_end': 327})], 3: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 4, 'base': 33}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 6, 'odd_start': 42, 'field_start': 33, 'row_origin': 36, 'address': 36, 'allocation_end': 45}), ({'w': 8, 'h': 6, 'x': 1, 'y': 2, 'b': 4, 'base': 33}, {'even_rows': 3, 'odd_rows': 3, 'field': 0, 'field_row': 1, 'row_pitch': 34, 'odd_start': 138, 'field_start': 33, 'row_origin': 70, 'address': 74, 'allocation_end': 243}), ({'w': 12, 'h': 10, 'x': 8, 'y': 6, 'b': 4, 'base': 33}, {'even_rows': 5, 'odd_rows': 5, 'field': 0, 'field_row': 3, 'row_pitch': 50, 'odd_start': 286, 'field_start': 33, 'row_origin': 186, 'address': 218, 'allocation_end': 539}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 4, 'base': 33}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 66, 'odd_start': 300, 'field_start': 300, 'row_origin': 501, 'address': 561, 'allocation_end': 567}), ({'w': 20, 'h': 12, 'x': 16, 'y': 8, 'b': 4, 'base': 33}, {'even_rows': 6, 'odd_rows': 6, 'field': 0, 'field_row': 4, 'row_pitch': 82, 'odd_start': 528, 'field_start': 33, 'row_origin': 364, 'address': 428, 'allocation_end': 1023}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 4, 'base': 33}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 30, 'odd_start': 246, 'field_start': 33, 'row_origin': 216, 'address': 228, 'allocation_end': 429})], 4: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 5, 'base': 44}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 7, 'odd_start': 54, 'field_start': 44, 'row_origin': 47, 'address': 47, 'allocation_end': 57}), ({'w': 9, 'h': 7, 'x': 1, 'y': 2, 'b': 5, 'base': 44}, {'even_rows': 4, 'odd_rows': 3, 'field': 0, 'field_row': 1, 'row_pitch': 47, 'odd_start': 235, 'field_start': 44, 'row_origin': 94, 'address': 99, 'allocation_end': 379}), ({'w': 13, 'h': 11, 'x': 8, 'y': 6, 'b': 5, 'base': 44}, {'even_rows': 6, 'odd_rows': 5, 'field': 0, 'field_row': 3, 'row_pitch': 67, 'odd_start': 449, 'field_start': 44, 'row_origin': 248, 'address': 288, 'allocation_end': 787}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 5, 'base': 44}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 82, 'odd_start': 375, 'field_start': 375, 'row_origin': 624, 'address': 699, 'allocation_end': 706}), ({'w': 21, 'h': 13, 'x': 16, 'y': 8, 'b': 5, 'base': 44}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 4, 'row_pitch': 107, 'odd_start': 796, 'field_start': 44, 'row_origin': 475, 'address': 555, 'allocation_end': 1441}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 5, 'base': 44}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 37, 'odd_start': 306, 'field_start': 44, 'row_origin': 269, 'address': 284, 'allocation_end': 531})], 5: [({'w': 1, 'h': 1, 'x': 0, 'y': 0, 'b': 6, 'base': 55}, {'even_rows': 1, 'odd_rows': 0, 'field': 0, 'field_row': 0, 'row_pitch': 8, 'odd_start': 66, 'field_start': 55, 'row_origin': 58, 'address': 58, 'allocation_end': 69}), ({'w': 10, 'h': 8, 'x': 1, 'y': 2, 'b': 6, 'base': 55}, {'even_rows': 4, 'odd_rows': 4, 'field': 0, 'field_row': 1, 'row_pitch': 62, 'odd_start': 306, 'field_start': 55, 'row_origin': 120, 'address': 126, 'allocation_end': 557}), ({'w': 14, 'h': 12, 'x': 8, 'y': 6, 'b': 6, 'base': 55}, {'even_rows': 6, 'odd_rows': 6, 'field': 0, 'field_row': 3, 'row_pitch': 86, 'odd_start': 574, 'field_start': 55, 'row_origin': 316, 'address': 364, 'allocation_end': 1093}), ({'w': 16, 'h': 8, 'x': 15, 'y': 7, 'b': 6, 'base': 55}, {'even_rows': 4, 'odd_rows': 4, 'field': 1, 'field_row': 3, 'row_pitch': 98, 'odd_start': 450, 'field_start': 450, 'row_origin': 747, 'address': 837, 'allocation_end': 845}), ({'w': 22, 'h': 14, 'x': 16, 'y': 8, 'b': 6, 'base': 55}, {'even_rows': 7, 'odd_rows': 7, 'field': 0, 'field_row': 4, 'row_pitch': 134, 'odd_start': 996, 'field_start': 55, 'row_origin': 594, 'address': 690, 'allocation_end': 1937}), ({'w': 7, 'h': 13, 'x': 3, 'y': 12, 'b': 6, 'base': 55}, {'even_rows': 7, 'odd_rows': 6, 'field': 0, 'field_row': 6, 'row_pitch': 44, 'odd_start': 366, 'field_start': 55, 'row_origin': 322, 'address': 340, 'allocation_end': 633})]}
for i, (p, expected) in enumerate(cases[N]):
    check("layout fixture " + str(i + 1), solve(p), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
layout fixture 1{'address': 14, 'allocation_end': 21, 'even_rows': 1, 'field': 0, 'field_row': 0, 'field_start': 11, 'odd_rows': 0, 'odd_start': 18, 'row_origin': 14, 'row_pitch': 4}{'address': 14, 'allocation_end': 21, 'even_rows': 1, 'field': 0, 'field_row': 0, 'field_start': 11, 'odd_rows': 0, 'odd_start': 18, 'row_origin': 14, 'row_pitch': 4}Passed
layout fixture 2{'address': 36, 'allocation_end': 73, 'even_rows': 2, 'field': 0, 'field_row': 1, 'field_start': 11, 'odd_rows': 2, 'odd_start': 42, 'row_origin': 28, 'row_pitch': 14}{'address': 30, 'allocation_end': 73, 'even_rows': 2, 'field': 0, 'field_row': 1, 'field_start': 11, 'odd_rows': 2, 'odd_start': 42, 'row_origin': 28, 'row_pitch': 14}Failed
layout fixture 3{'address': 82, 'allocation_end': 193, 'even_rows': 4, 'field': 0, 'field_row': 3, 'field_start': 11, 'odd_rows': 4, 'odd_start': 102, 'row_origin': 80, 'row_pitch': 22}{'address': 96, 'allocation_end': 193, 'even_rows': 4, 'field': 0, 'field_row': 3, 'field_start': 11, 'odd_rows': 4, 'odd_start': 102, 'row_origin': 80, 'row_pitch': 22}Failed
layout fixture 4{'address': 255, 'allocation_end': 289, 'even_rows': 4, 'field': 1, 'field_row': 3, 'field_start': 150, 'odd_rows': 4, 'odd_start': 150, 'row_origin': 255, 'row_pitch': 34}{'address': 285, 'allocation_end': 289, 'even_rows': 4, 'field': 1, 'field_row': 3, 'field_start': 150, 'odd_rows': 4, 'odd_start': 150, 'row_origin': 255, 'row_pitch': 34}Failed
layout fixture 5{'address': 168, 'allocation_end': 397, 'even_rows': 5, 'field': 0, 'field_row': 4, 'field_start': 11, 'odd_rows': 5, 'odd_start': 204, 'row_origin': 166, 'row_pitch': 38}{'address': 198, 'allocation_end': 397, 'even_rows': 5, 'field': 0, 'field_row': 4, 'field_start': 11, 'odd_rows': 5, 'odd_start': 204, 'row_origin': 166, 'row_pitch': 38}Failed
layout fixture 6{'address': 116, 'allocation_end': 225, 'even_rows': 7, 'field': 0, 'field_row': 6, 'field_start': 11, 'odd_rows': 6, 'odd_start': 126, 'row_origin': 110, 'row_pitch': 16}{'address': 116, 'allocation_end': 225, 'even_rows': 7, 'field': 0, 'field_row': 6, 'field_start': 11, 'odd_rows': 6, 'odd_start': 126, 'row_origin': 110, 'row_pitch': 16}Passed

SHA-256 / 98c64ec08a3aa69634547f11f56d641fd27a54addce9e5a3d5ab33701f520794

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 6 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

Stipulated deterministic toy buffer layout; not a graphics API, codec, GPU vendor tiling specification, or hardware-conformance claim. Inputs satisfy the dimensions and bounds stated by the model. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:45:27.994471+00:00.

Case digest / fd558b2dde0c53a8cadb5fc0f220083e1485fc5975f0408f08222d3254c54b6b