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FA-52401 / Raster memory layout / Open access

Indexed Nibble Records: Scanline checksum omitted or mistaken for per-byte data · case 01

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

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

ROOT CAUSE

Scanline checksum omitted or mistaken for per-byte data The faulty expression is packed_bytes.

THE FAILURE

Scanline checksum omitted or mistaken for per-byte data The faulty expression is packed_bytes.

Unsuccessful approach: The attempted repair uses packed_bytes*2 and still violates the layout contract.

Case contract

An indexed image has a palette of three-byte entries, a two-byte palette-count field, and high-nibble-first pixels. Each scanline starts with a one-byte checksum. Odd final low nibbles are padding. 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)
    palette_bytes = 2+p["colors"]*3
    packed_bytes = (p["w"]+1)//2
    row_pitch = packed_bytes
    image_origin = p["base"]+palette_bytes
    byte_address = image_origin+p["y"]*row_pitch+1+p["x"]//2
    shift = 4 if p["x"]%2==0 else 0
    keep_mask = 255 ^ (15<<shift)
    written_byte = (p["old"]&keep_mask)|((p["value"]&15)<<shift)
    tail_mask = 240 if p["w"]%2 else 255
    allocation_end = image_origin+p["h"]*row_pitch
    return {'palette_bytes': palette_bytes, 'packed_bytes': packed_bytes, 'row_pitch': row_pitch, 'image_origin': image_origin, 'byte_address': byte_address, 'shift': shift, 'keep_mask': keep_mask, 'written_byte': written_byte, 'tail_mask': tail_mask, 'allocation_end': allocation_end}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [({'w': 4, 'h': 2, 'x': 0, 'y': 0, 'colors': 5, 'base': 17, 'value': 1, 'old': 35}, {'palette_bytes': 17, 'packed_bytes': 2, 'row_pitch': 3, 'image_origin': 34, 'byte_address': 35, 'shift': 4, 'keep_mask': 15, 'written_byte': 19, 'tail_mask': 255, 'allocation_end': 40}), ({'w': 5, 'h': 3, 'x': 1, 'y': 1, 'colors': 5, 'base': 17, 'value': 2, 'old': 36}, {'palette_bytes': 17, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 34, 'byte_address': 39, 'shift': 0, 'keep_mask': 240, 'written_byte': 34, 'tail_mask': 240, 'allocation_end': 46}), ({'w': 6, 'h': 4, 'x': 2, 'y': 2, 'colors': 5, 'base': 17, 'value': 3, 'old': 37}, {'palette_bytes': 17, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 34, 'byte_address': 44, 'shift': 4, 'keep_mask': 15, 'written_byte': 53, 'tail_mask': 255, 'allocation_end': 50}), ({'w': 7, 'h': 5, 'x': 3, 'y': 3, 'colors': 5, 'base': 17, 'value': 4, 'old': 38}, {'palette_bytes': 17, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 34, 'byte_address': 51, 'shift': 0, 'keep_mask': 240, 'written_byte': 36, 'tail_mask': 240, 'allocation_end': 59}), ({'w': 8, 'h': 6, 'x': 4, 'y': 4, 'colors': 5, 'base': 17, 'value': 5, 'old': 39}, {'palette_bytes': 17, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 34, 'byte_address': 57, 'shift': 4, 'keep_mask': 15, 'written_byte': 87, 'tail_mask': 255, 'allocation_end': 64}), ({'w': 9, 'h': 7, 'x': 5, 'y': 5, 'colors': 5, 'base': 17, 'value': 6, 'old': 40}, {'palette_bytes': 17, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 34, 'byte_address': 67, 'shift': 0, 'keep_mask': 240, 'written_byte': 38, 'tail_mask': 240, 'allocation_end': 76})], 2: [({'w': 5, 'h': 2, 'x': 0, 'y': 0, 'colors': 6, 'base': 34, 'value': 2, 'old': 35}, {'palette_bytes': 20, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 54, 'byte_address': 55, 'shift': 4, 'keep_mask': 15, 'written_byte': 35, 'tail_mask': 240, 'allocation_end': 62}), ({'w': 6, 'h': 3, 'x': 1, 'y': 1, 'colors': 6, 'base': 34, 'value': 3, 'old': 36}, {'palette_bytes': 20, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 54, 'byte_address': 59, 'shift': 0, 'keep_mask': 240, 'written_byte': 35, 'tail_mask': 255, 'allocation_end': 66}), ({'w': 7, 'h': 4, 'x': 2, 'y': 2, 'colors': 6, 'base': 34, 'value': 4, 'old': 37}, {'palette_bytes': 20, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 54, 'byte_address': 66, 'shift': 4, 'keep_mask': 15, 'written_byte': 69, 'tail_mask': 240, 'allocation_end': 74}), ({'w': 8, 'h': 5, 'x': 3, 'y': 3, 'colors': 6, 'base': 34, 'value': 5, 'old': 38}, {'palette_bytes': 20, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 54, 'byte_address': 71, 'shift': 0, 'keep_mask': 240, 'written_byte': 37, 'tail_mask': 255, 'allocation_end': 79}), ({'w': 9, 'h': 6, 'x': 4, 'y': 4, 'colors': 6, 'base': 34, 'value': 6, 'old': 39}, {'palette_bytes': 20, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 54, 'byte_address': 81, 'shift': 4, 'keep_mask': 15, 'written_byte': 103, 'tail_mask': 240, 'allocation_end': 90}), ({'w': 10, 'h': 7, 'x': 5, 'y': 5, 'colors': 6, 'base': 34, 'value': 7, 'old': 40}, {'palette_bytes': 20, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 54, 'byte_address': 87, 'shift': 0, 'keep_mask': 240, 'written_byte': 39, 'tail_mask': 255, 'allocation_end': 96})], 3: [({'w': 6, 'h': 2, 'x': 0, 'y': 0, 'colors': 7, 'base': 51, 'value': 3, 'old': 35}, {'palette_bytes': 23, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 74, 'byte_address': 75, 'shift': 4, 'keep_mask': 15, 'written_byte': 51, 'tail_mask': 255, 'allocation_end': 82}), ({'w': 7, 'h': 3, 'x': 1, 'y': 1, 'colors': 7, 'base': 51, 'value': 4, 'old': 36}, {'palette_bytes': 23, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 74, 'byte_address': 80, 'shift': 0, 'keep_mask': 240, 'written_byte': 36, 'tail_mask': 240, 'allocation_end': 89}), ({'w': 8, 'h': 4, 'x': 2, 'y': 2, 'colors': 7, 'base': 51, 'value': 5, 'old': 37}, {'palette_bytes': 23, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 74, 'byte_address': 86, 'shift': 4, 'keep_mask': 15, 'written_byte': 85, 'tail_mask': 255, 'allocation_end': 94}), ({'w': 9, 'h': 5, 'x': 3, 'y': 3, 'colors': 7, 'base': 51, 'value': 6, 'old': 38}, {'palette_bytes': 23, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 74, 'byte_address': 94, 'shift': 0, 'keep_mask': 240, 'written_byte': 38, 'tail_mask': 240, 'allocation_end': 104}), ({'w': 10, 'h': 6, 'x': 4, 'y': 4, 'colors': 7, 'base': 51, 'value': 7, 'old': 39}, {'palette_bytes': 23, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 74, 'byte_address': 101, 'shift': 4, 'keep_mask': 15, 'written_byte': 119, 'tail_mask': 255, 'allocation_end': 110}), ({'w': 11, 'h': 7, 'x': 5, 'y': 5, 'colors': 7, 'base': 51, 'value': 8, 'old': 40}, {'palette_bytes': 23, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 74, 'byte_address': 112, 'shift': 0, 'keep_mask': 240, 'written_byte': 40, 'tail_mask': 240, 'allocation_end': 123})], 4: [({'w': 7, 'h': 2, 'x': 0, 'y': 0, 'colors': 8, 'base': 68, 'value': 4, 'old': 35}, {'palette_bytes': 26, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 94, 'byte_address': 95, 'shift': 4, 'keep_mask': 15, 'written_byte': 67, 'tail_mask': 240, 'allocation_end': 104}), ({'w': 8, 'h': 3, 'x': 1, 'y': 1, 'colors': 8, 'base': 68, 'value': 5, 'old': 36}, {'palette_bytes': 26, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 94, 'byte_address': 100, 'shift': 0, 'keep_mask': 240, 'written_byte': 37, 'tail_mask': 255, 'allocation_end': 109}), ({'w': 9, 'h': 4, 'x': 2, 'y': 2, 'colors': 8, 'base': 68, 'value': 6, 'old': 37}, {'palette_bytes': 26, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 94, 'byte_address': 108, 'shift': 4, 'keep_mask': 15, 'written_byte': 101, 'tail_mask': 240, 'allocation_end': 118}), ({'w': 10, 'h': 5, 'x': 3, 'y': 3, 'colors': 8, 'base': 68, 'value': 7, 'old': 38}, {'palette_bytes': 26, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 94, 'byte_address': 114, 'shift': 0, 'keep_mask': 240, 'written_byte': 39, 'tail_mask': 255, 'allocation_end': 124}), ({'w': 11, 'h': 6, 'x': 4, 'y': 4, 'colors': 8, 'base': 68, 'value': 8, 'old': 39}, {'palette_bytes': 26, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 94, 'byte_address': 125, 'shift': 4, 'keep_mask': 15, 'written_byte': 135, 'tail_mask': 240, 'allocation_end': 136}), ({'w': 12, 'h': 7, 'x': 5, 'y': 5, 'colors': 8, 'base': 68, 'value': 9, 'old': 40}, {'palette_bytes': 26, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 94, 'byte_address': 132, 'shift': 0, 'keep_mask': 240, 'written_byte': 41, 'tail_mask': 255, 'allocation_end': 143})], 5: [({'w': 8, 'h': 2, 'x': 0, 'y': 0, 'colors': 9, 'base': 85, 'value': 5, 'old': 35}, {'palette_bytes': 29, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 114, 'byte_address': 115, 'shift': 4, 'keep_mask': 15, 'written_byte': 83, 'tail_mask': 255, 'allocation_end': 124}), ({'w': 9, 'h': 3, 'x': 1, 'y': 1, 'colors': 9, 'base': 85, 'value': 6, 'old': 36}, {'palette_bytes': 29, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 114, 'byte_address': 121, 'shift': 0, 'keep_mask': 240, 'written_byte': 38, 'tail_mask': 240, 'allocation_end': 132}), ({'w': 10, 'h': 4, 'x': 2, 'y': 2, 'colors': 9, 'base': 85, 'value': 7, 'old': 37}, {'palette_bytes': 29, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 114, 'byte_address': 128, 'shift': 4, 'keep_mask': 15, 'written_byte': 117, 'tail_mask': 255, 'allocation_end': 138}), ({'w': 11, 'h': 5, 'x': 3, 'y': 3, 'colors': 9, 'base': 85, 'value': 8, 'old': 38}, {'palette_bytes': 29, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 114, 'byte_address': 137, 'shift': 0, 'keep_mask': 240, 'written_byte': 40, 'tail_mask': 240, 'allocation_end': 149}), ({'w': 12, 'h': 6, 'x': 4, 'y': 4, 'colors': 9, 'base': 85, 'value': 9, 'old': 39}, {'palette_bytes': 29, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 114, 'byte_address': 145, 'shift': 4, 'keep_mask': 15, 'written_byte': 151, 'tail_mask': 255, 'allocation_end': 156}), ({'w': 13, 'h': 7, 'x': 5, 'y': 5, 'colors': 9, 'base': 85, 'value': 10, 'old': 40}, {'palette_bytes': 29, 'packed_bytes': 7, 'row_pitch': 8, 'image_origin': 114, 'byte_address': 157, 'shift': 0, 'keep_mask': 240, 'written_byte': 42, 'tail_mask': 240, 'allocation_end': 170})]}
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{'allocation_end': 38, 'byte_address': 35, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 2, 'palette_bytes': 17, 'row_pitch': 2, 'shift': 4, 'tail_mask': 255, 'written_byte': 19}{'allocation_end': 40, 'byte_address': 35, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 2, 'palette_bytes': 17, 'row_pitch': 3, 'shift': 4, 'tail_mask': 255, 'written_byte': 19}Failed
layout fixture 2{'allocation_end': 43, 'byte_address': 38, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 3, 'shift': 0, 'tail_mask': 240, 'written_byte': 34}{'allocation_end': 46, 'byte_address': 39, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 4, 'shift': 0, 'tail_mask': 240, 'written_byte': 34}Failed
layout fixture 3{'allocation_end': 46, 'byte_address': 42, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 3, 'shift': 4, 'tail_mask': 255, 'written_byte': 53}{'allocation_end': 50, 'byte_address': 44, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 4, 'shift': 4, 'tail_mask': 255, 'written_byte': 53}Failed
layout fixture 4{'allocation_end': 54, 'byte_address': 48, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 4, 'shift': 0, 'tail_mask': 240, 'written_byte': 36}{'allocation_end': 59, 'byte_address': 51, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 5, 'shift': 0, 'tail_mask': 240, 'written_byte': 36}Failed
layout fixture 5{'allocation_end': 58, 'byte_address': 53, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 4, 'shift': 4, 'tail_mask': 255, 'written_byte': 87}{'allocation_end': 64, 'byte_address': 57, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 5, 'shift': 4, 'tail_mask': 255, 'written_byte': 87}Failed
layout fixture 6{'allocation_end': 69, 'byte_address': 62, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 5, 'palette_bytes': 17, 'row_pitch': 5, 'shift': 0, 'tail_mask': 240, 'written_byte': 38}{'allocation_end': 76, 'byte_address': 67, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 5, 'palette_bytes': 17, 'row_pitch': 6, 'shift': 0, 'tail_mask': 240, 'written_byte': 38}Failed

SHA-256 / 6f5c4c2cb678ab1a434d96cb25f0511fc52ef9c99bacc1b1fc4e0ff36a2eafda

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)
    palette_bytes = 2+p["colors"]*3
    packed_bytes = (p["w"]+1)//2
    row_pitch = packed_bytes*2
    image_origin = p["base"]+palette_bytes
    byte_address = image_origin+p["y"]*row_pitch+1+p["x"]//2
    shift = 4 if p["x"]%2==0 else 0
    keep_mask = 255 ^ (15<<shift)
    written_byte = (p["old"]&keep_mask)|((p["value"]&15)<<shift)
    tail_mask = 240 if p["w"]%2 else 255
    allocation_end = image_origin+p["h"]*row_pitch
    return {'palette_bytes': palette_bytes, 'packed_bytes': packed_bytes, 'row_pitch': row_pitch, 'image_origin': image_origin, 'byte_address': byte_address, 'shift': shift, 'keep_mask': keep_mask, 'written_byte': written_byte, 'tail_mask': tail_mask, 'allocation_end': allocation_end}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [({'w': 4, 'h': 2, 'x': 0, 'y': 0, 'colors': 5, 'base': 17, 'value': 1, 'old': 35}, {'palette_bytes': 17, 'packed_bytes': 2, 'row_pitch': 3, 'image_origin': 34, 'byte_address': 35, 'shift': 4, 'keep_mask': 15, 'written_byte': 19, 'tail_mask': 255, 'allocation_end': 40}), ({'w': 5, 'h': 3, 'x': 1, 'y': 1, 'colors': 5, 'base': 17, 'value': 2, 'old': 36}, {'palette_bytes': 17, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 34, 'byte_address': 39, 'shift': 0, 'keep_mask': 240, 'written_byte': 34, 'tail_mask': 240, 'allocation_end': 46}), ({'w': 6, 'h': 4, 'x': 2, 'y': 2, 'colors': 5, 'base': 17, 'value': 3, 'old': 37}, {'palette_bytes': 17, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 34, 'byte_address': 44, 'shift': 4, 'keep_mask': 15, 'written_byte': 53, 'tail_mask': 255, 'allocation_end': 50}), ({'w': 7, 'h': 5, 'x': 3, 'y': 3, 'colors': 5, 'base': 17, 'value': 4, 'old': 38}, {'palette_bytes': 17, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 34, 'byte_address': 51, 'shift': 0, 'keep_mask': 240, 'written_byte': 36, 'tail_mask': 240, 'allocation_end': 59}), ({'w': 8, 'h': 6, 'x': 4, 'y': 4, 'colors': 5, 'base': 17, 'value': 5, 'old': 39}, {'palette_bytes': 17, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 34, 'byte_address': 57, 'shift': 4, 'keep_mask': 15, 'written_byte': 87, 'tail_mask': 255, 'allocation_end': 64}), ({'w': 9, 'h': 7, 'x': 5, 'y': 5, 'colors': 5, 'base': 17, 'value': 6, 'old': 40}, {'palette_bytes': 17, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 34, 'byte_address': 67, 'shift': 0, 'keep_mask': 240, 'written_byte': 38, 'tail_mask': 240, 'allocation_end': 76})], 2: [({'w': 5, 'h': 2, 'x': 0, 'y': 0, 'colors': 6, 'base': 34, 'value': 2, 'old': 35}, {'palette_bytes': 20, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 54, 'byte_address': 55, 'shift': 4, 'keep_mask': 15, 'written_byte': 35, 'tail_mask': 240, 'allocation_end': 62}), ({'w': 6, 'h': 3, 'x': 1, 'y': 1, 'colors': 6, 'base': 34, 'value': 3, 'old': 36}, {'palette_bytes': 20, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 54, 'byte_address': 59, 'shift': 0, 'keep_mask': 240, 'written_byte': 35, 'tail_mask': 255, 'allocation_end': 66}), ({'w': 7, 'h': 4, 'x': 2, 'y': 2, 'colors': 6, 'base': 34, 'value': 4, 'old': 37}, {'palette_bytes': 20, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 54, 'byte_address': 66, 'shift': 4, 'keep_mask': 15, 'written_byte': 69, 'tail_mask': 240, 'allocation_end': 74}), ({'w': 8, 'h': 5, 'x': 3, 'y': 3, 'colors': 6, 'base': 34, 'value': 5, 'old': 38}, {'palette_bytes': 20, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 54, 'byte_address': 71, 'shift': 0, 'keep_mask': 240, 'written_byte': 37, 'tail_mask': 255, 'allocation_end': 79}), ({'w': 9, 'h': 6, 'x': 4, 'y': 4, 'colors': 6, 'base': 34, 'value': 6, 'old': 39}, {'palette_bytes': 20, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 54, 'byte_address': 81, 'shift': 4, 'keep_mask': 15, 'written_byte': 103, 'tail_mask': 240, 'allocation_end': 90}), ({'w': 10, 'h': 7, 'x': 5, 'y': 5, 'colors': 6, 'base': 34, 'value': 7, 'old': 40}, {'palette_bytes': 20, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 54, 'byte_address': 87, 'shift': 0, 'keep_mask': 240, 'written_byte': 39, 'tail_mask': 255, 'allocation_end': 96})], 3: [({'w': 6, 'h': 2, 'x': 0, 'y': 0, 'colors': 7, 'base': 51, 'value': 3, 'old': 35}, {'palette_bytes': 23, 'packed_bytes': 3, 'row_pitch': 4, 'image_origin': 74, 'byte_address': 75, 'shift': 4, 'keep_mask': 15, 'written_byte': 51, 'tail_mask': 255, 'allocation_end': 82}), ({'w': 7, 'h': 3, 'x': 1, 'y': 1, 'colors': 7, 'base': 51, 'value': 4, 'old': 36}, {'palette_bytes': 23, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 74, 'byte_address': 80, 'shift': 0, 'keep_mask': 240, 'written_byte': 36, 'tail_mask': 240, 'allocation_end': 89}), ({'w': 8, 'h': 4, 'x': 2, 'y': 2, 'colors': 7, 'base': 51, 'value': 5, 'old': 37}, {'palette_bytes': 23, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 74, 'byte_address': 86, 'shift': 4, 'keep_mask': 15, 'written_byte': 85, 'tail_mask': 255, 'allocation_end': 94}), ({'w': 9, 'h': 5, 'x': 3, 'y': 3, 'colors': 7, 'base': 51, 'value': 6, 'old': 38}, {'palette_bytes': 23, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 74, 'byte_address': 94, 'shift': 0, 'keep_mask': 240, 'written_byte': 38, 'tail_mask': 240, 'allocation_end': 104}), ({'w': 10, 'h': 6, 'x': 4, 'y': 4, 'colors': 7, 'base': 51, 'value': 7, 'old': 39}, {'palette_bytes': 23, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 74, 'byte_address': 101, 'shift': 4, 'keep_mask': 15, 'written_byte': 119, 'tail_mask': 255, 'allocation_end': 110}), ({'w': 11, 'h': 7, 'x': 5, 'y': 5, 'colors': 7, 'base': 51, 'value': 8, 'old': 40}, {'palette_bytes': 23, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 74, 'byte_address': 112, 'shift': 0, 'keep_mask': 240, 'written_byte': 40, 'tail_mask': 240, 'allocation_end': 123})], 4: [({'w': 7, 'h': 2, 'x': 0, 'y': 0, 'colors': 8, 'base': 68, 'value': 4, 'old': 35}, {'palette_bytes': 26, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 94, 'byte_address': 95, 'shift': 4, 'keep_mask': 15, 'written_byte': 67, 'tail_mask': 240, 'allocation_end': 104}), ({'w': 8, 'h': 3, 'x': 1, 'y': 1, 'colors': 8, 'base': 68, 'value': 5, 'old': 36}, {'palette_bytes': 26, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 94, 'byte_address': 100, 'shift': 0, 'keep_mask': 240, 'written_byte': 37, 'tail_mask': 255, 'allocation_end': 109}), ({'w': 9, 'h': 4, 'x': 2, 'y': 2, 'colors': 8, 'base': 68, 'value': 6, 'old': 37}, {'palette_bytes': 26, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 94, 'byte_address': 108, 'shift': 4, 'keep_mask': 15, 'written_byte': 101, 'tail_mask': 240, 'allocation_end': 118}), ({'w': 10, 'h': 5, 'x': 3, 'y': 3, 'colors': 8, 'base': 68, 'value': 7, 'old': 38}, {'palette_bytes': 26, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 94, 'byte_address': 114, 'shift': 0, 'keep_mask': 240, 'written_byte': 39, 'tail_mask': 255, 'allocation_end': 124}), ({'w': 11, 'h': 6, 'x': 4, 'y': 4, 'colors': 8, 'base': 68, 'value': 8, 'old': 39}, {'palette_bytes': 26, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 94, 'byte_address': 125, 'shift': 4, 'keep_mask': 15, 'written_byte': 135, 'tail_mask': 240, 'allocation_end': 136}), ({'w': 12, 'h': 7, 'x': 5, 'y': 5, 'colors': 8, 'base': 68, 'value': 9, 'old': 40}, {'palette_bytes': 26, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 94, 'byte_address': 132, 'shift': 0, 'keep_mask': 240, 'written_byte': 41, 'tail_mask': 255, 'allocation_end': 143})], 5: [({'w': 8, 'h': 2, 'x': 0, 'y': 0, 'colors': 9, 'base': 85, 'value': 5, 'old': 35}, {'palette_bytes': 29, 'packed_bytes': 4, 'row_pitch': 5, 'image_origin': 114, 'byte_address': 115, 'shift': 4, 'keep_mask': 15, 'written_byte': 83, 'tail_mask': 255, 'allocation_end': 124}), ({'w': 9, 'h': 3, 'x': 1, 'y': 1, 'colors': 9, 'base': 85, 'value': 6, 'old': 36}, {'palette_bytes': 29, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 114, 'byte_address': 121, 'shift': 0, 'keep_mask': 240, 'written_byte': 38, 'tail_mask': 240, 'allocation_end': 132}), ({'w': 10, 'h': 4, 'x': 2, 'y': 2, 'colors': 9, 'base': 85, 'value': 7, 'old': 37}, {'palette_bytes': 29, 'packed_bytes': 5, 'row_pitch': 6, 'image_origin': 114, 'byte_address': 128, 'shift': 4, 'keep_mask': 15, 'written_byte': 117, 'tail_mask': 255, 'allocation_end': 138}), ({'w': 11, 'h': 5, 'x': 3, 'y': 3, 'colors': 9, 'base': 85, 'value': 8, 'old': 38}, {'palette_bytes': 29, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 114, 'byte_address': 137, 'shift': 0, 'keep_mask': 240, 'written_byte': 40, 'tail_mask': 240, 'allocation_end': 149}), ({'w': 12, 'h': 6, 'x': 4, 'y': 4, 'colors': 9, 'base': 85, 'value': 9, 'old': 39}, {'palette_bytes': 29, 'packed_bytes': 6, 'row_pitch': 7, 'image_origin': 114, 'byte_address': 145, 'shift': 4, 'keep_mask': 15, 'written_byte': 151, 'tail_mask': 255, 'allocation_end': 156}), ({'w': 13, 'h': 7, 'x': 5, 'y': 5, 'colors': 9, 'base': 85, 'value': 10, 'old': 40}, {'palette_bytes': 29, 'packed_bytes': 7, 'row_pitch': 8, 'image_origin': 114, 'byte_address': 157, 'shift': 0, 'keep_mask': 240, 'written_byte': 42, 'tail_mask': 240, 'allocation_end': 170})]}
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{'allocation_end': 42, 'byte_address': 35, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 2, 'palette_bytes': 17, 'row_pitch': 4, 'shift': 4, 'tail_mask': 255, 'written_byte': 19}{'allocation_end': 40, 'byte_address': 35, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 2, 'palette_bytes': 17, 'row_pitch': 3, 'shift': 4, 'tail_mask': 255, 'written_byte': 19}Failed
layout fixture 2{'allocation_end': 52, 'byte_address': 41, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 6, 'shift': 0, 'tail_mask': 240, 'written_byte': 34}{'allocation_end': 46, 'byte_address': 39, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 4, 'shift': 0, 'tail_mask': 240, 'written_byte': 34}Failed
layout fixture 3{'allocation_end': 58, 'byte_address': 48, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 6, 'shift': 4, 'tail_mask': 255, 'written_byte': 53}{'allocation_end': 50, 'byte_address': 44, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 3, 'palette_bytes': 17, 'row_pitch': 4, 'shift': 4, 'tail_mask': 255, 'written_byte': 53}Failed
layout fixture 4{'allocation_end': 74, 'byte_address': 60, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 8, 'shift': 0, 'tail_mask': 240, 'written_byte': 36}{'allocation_end': 59, 'byte_address': 51, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 5, 'shift': 0, 'tail_mask': 240, 'written_byte': 36}Failed
layout fixture 5{'allocation_end': 82, 'byte_address': 69, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 8, 'shift': 4, 'tail_mask': 255, 'written_byte': 87}{'allocation_end': 64, 'byte_address': 57, 'image_origin': 34, 'keep_mask': 15, 'packed_bytes': 4, 'palette_bytes': 17, 'row_pitch': 5, 'shift': 4, 'tail_mask': 255, 'written_byte': 87}Failed
layout fixture 6{'allocation_end': 104, 'byte_address': 87, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 5, 'palette_bytes': 17, 'row_pitch': 10, 'shift': 0, 'tail_mask': 240, 'written_byte': 38}{'allocation_end': 76, 'byte_address': 67, 'image_origin': 34, 'keep_mask': 240, 'packed_bytes': 5, 'palette_bytes': 17, 'row_pitch': 6, 'shift': 0, 'tail_mask': 240, 'written_byte': 38}Failed

SHA-256 / d2fb1203db211d2b25b3f7070982e0fe19021934756b30b8d5b0bce5da6bd84d

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 2026-09-29T14:45:28.847815+00:00.

Case digest / dcae31322b9e38aba21204f45f5f7d6e07988bf8a20d8add699adbb175169164