FAILURE MAP
← Case archive

FA-51541 / Raster clipping / Open access

Cohen sutherland pixel window: outside code merge · case 01

The edge to clip is chosen from the union of both outcodes, so an intersection computed for one endpoint is written into the other endpoint.

Verified by executionVariant 1 · 16 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The edge to clip is chosen from the union of both outcodes, so an intersection computed for one endpoint is written into the other endpoint.

THE FAILURE

The edge to clip is chosen from the union of both outcodes, so an intersection computed for one endpoint is written into the other endpoint.

Unsuccessful approach: Using a single endpoint code only when the other is inside repairs one-sided entry but still mixes codes when both endpoints are outside.

Case contract

Each command is a segment [x0,y0,x1,y1] whose endpoints are integers or exact decimal/rational strings in pixel-center coordinates. The window is the closed square [0,size-1]x[0,size-1] of pixel centers. Outcodes use strict outside tests (left 1, right 2, below 4, above 8). Both codes zero accepts; a shared bit rejects; otherwise the outside endpoint (endpoint 0 first) is moved to the highest set edge in above, below, right, left order and its code is recomputed from the new point; a clip against an edge parallel to the segment is treated as a rejection. At most five iterations are allowed; an unresolved or rejected segment returns None. Accepted endpoints round half-up to integer pixels.

Why this case matters

Raster clipping decides which pixels a primitive may touch; a single wrong clip decision writes outside the target or scissor, or silently drops visible coverage.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
from fractions import Fraction
N = 1
observations = []
def solve(commands, size):
    lo=0
    hi=size-1
    def code(x,y):
        c=0
        if x<lo: c|=1
        elif x>hi: c|=2
        if y<lo: c|=4
        elif y>hi: c|=8
        return c
    out=[]
    for x0,y0,x1,y1 in commands:
        x0,y0,x1,y1=[Fraction(v) for v in (x0,y0,x1,y1)]
        c0,c1=code(x0,y0),code(x1,y1)
        result=None
        for _ in range(5):
            if not (c0|c1):
                result=[int((v+Fraction(1,2))//1) for v in (x0,y0,x1,y1)]
                break
            if c0&c1: break
            c=c0|c1
            if c&12 and y1==y0 or c&3 and x1==x0: break
            if c&8: x,y=x0+(x1-x0)*(hi-y0)/(y1-y0),Fraction(hi)
            elif c&4: x,y=x0+(x1-x0)*(lo-y0)/(y1-y0),Fraction(lo)
            elif c&2: x,y=Fraction(hi),y0+(y1-y0)*(hi-x0)/(x1-x0)
            else: x,y=Fraction(lo),y0+(y1-y0)*(lo-x0)/(x1-x0)
            if c==c0:
                x0,y0=x,y
                c0=code(x0,y0)
            else:
                x1,y1=x,y
                c1=code(x1,y1)
        out.append(result)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit case 0', solve([[1, 1, 4, 3]], 6), [[1, 1, 4, 3]])
    check('explicit case 1', solve([[-3, 2, 8, 2]], 6), [[0, 2, 5, 2]])
    check('explicit case 2', solve([[-2, -2, 7, 7]], 6), [[0, 0, 5, 5]])
    check('explicit case 3', solve([[-3, 0, -1, 5]], 6), [None])
    check('explicit case 4', solve([[0, 0, 5, 5]], 6), [[0, 0, 5, 5]])
    check('explicit case 5', solve([[0, 0, '5.8', 0]], 6), [[0, 0, 5, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 6), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 6), [None])
    check('explicit case 8', solve([[-2, 1, 4, 10]], 6), [[0, 4, 1, 5]])
    check('explicit case 9', solve([[0, '2.5', 5, '2.5']], 6), [[0, 3, 5, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 6), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 9, 0]], 6), [[0, 0, 5, 0]])
    check('explicit case 12', solve([['-5', '-7/2', '10', '17/2']], 6), [[0, 1, 5, 5]])
    check('explicit case 13', solve([[2, 1, 4, 11]], 6), [[2, 1, 3, 5]])
    check('explicit case 14', solve([[3, 8, 1, -2]], 6), [[2, 5, 1, 0]])
    check('explicit case 15', solve([[8, 1, 1, 9]], 6), [[5, 4, 5, 5]])
if N == 2:
    check('explicit case 0', solve([[1, 1, 5, 4]], 7), [[1, 1, 5, 4]])
    check('explicit case 1', solve([[-3, 2, 9, 2]], 7), [[0, 2, 6, 2]])
    check('explicit case 2', solve([[-2, -2, 8, 8]], 7), [[0, 0, 6, 6]])
    check('explicit case 3', solve([[-3, 0, -1, 6]], 7), [None])
    check('explicit case 4', solve([[0, 0, 6, 6]], 7), [[0, 0, 6, 6]])
    check('explicit case 5', solve([[0, 0, '6.8', 0]], 7), [[0, 0, 6, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 7), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 7), [None])
    check('explicit case 8', solve([[-2, 1, 4, 11]], 7), [[0, 4, 1, 6]])
    check('explicit case 9', solve([[0, '2.5', 6, '2.5']], 7), [[0, 3, 6, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 7), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 10, 0]], 7), [[0, 0, 6, 0]])
    check('explicit case 12', solve([['-6', '-9/2', '12', '21/2']], 7), [[0, 1, 6, 6]])
    check('explicit case 13', solve([[2, 1, 4, 12]], 7), [[2, 1, 3, 6]])
    check('explicit case 14', solve([[3, 9, 1, -2]], 7), [[2, 6, 1, 0]])
    check('explicit case 15', solve([[9, 1, 1, 10]], 7), [[6, 4, 5, 6]])
if N == 3:
    check('explicit case 0', solve([[1, 1, 6, 5]], 8), [[1, 1, 6, 5]])
    check('explicit case 1', solve([[-3, 2, 10, 2]], 8), [[0, 2, 7, 2]])
    check('explicit case 2', solve([[-2, -2, 9, 9]], 8), [[0, 0, 7, 7]])
    check('explicit case 3', solve([[-3, 0, -1, 7]], 8), [None])
    check('explicit case 4', solve([[0, 0, 7, 7]], 8), [[0, 0, 7, 7]])
    check('explicit case 5', solve([[0, 0, '7.8', 0]], 8), [[0, 0, 7, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 8), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 8), [None])
    check('explicit case 8', solve([[-2, 1, 4, 12]], 8), [[0, 5, 1, 7]])
    check('explicit case 9', solve([[0, '2.5', 7, '2.5']], 8), [[0, 3, 7, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 8), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 11, 0]], 8), [[0, 0, 7, 0]])
    check('explicit case 12', solve([['-7', '-11/2', '14', '25/2']], 8), [[0, 1, 7, 7]])
    check('explicit case 13', solve([[2, 1, 4, 13]], 8), [[2, 1, 3, 7]])
    check('explicit case 14', solve([[3, 10, 1, -2]], 8), [[3, 7, 1, 0]])
    check('explicit case 15', solve([[10, 1, 1, 11]], 8), [[7, 4, 5, 7]])
if N == 4:
    check('explicit case 0', solve([[1, 1, 7, 6]], 9), [[1, 1, 7, 6]])
    check('explicit case 1', solve([[-3, 2, 11, 2]], 9), [[0, 2, 8, 2]])
    check('explicit case 2', solve([[-2, -2, 10, 10]], 9), [[0, 0, 8, 8]])
    check('explicit case 3', solve([[-3, 0, -1, 8]], 9), [None])
    check('explicit case 4', solve([[0, 0, 8, 8]], 9), [[0, 0, 8, 8]])
    check('explicit case 5', solve([[0, 0, '8.8', 0]], 9), [[0, 0, 8, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 9), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 9), [None])
    check('explicit case 8', solve([[-2, 1, 4, 13]], 9), [[0, 5, 2, 8]])
    check('explicit case 9', solve([[0, '2.5', 8, '2.5']], 9), [[0, 3, 8, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 9), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 12, 0]], 9), [[0, 0, 8, 0]])
    check('explicit case 12', solve([['-8', '-13/2', '16', '29/2']], 9), [[0, 1, 8, 8]])
    check('explicit case 13', solve([[2, 1, 4, 14]], 9), [[2, 1, 3, 8]])
    check('explicit case 14', solve([[3, 11, 1, -2]], 9), [[3, 8, 1, 0]])
    check('explicit case 15', solve([[11, 1, 1, 12]], 9), [[8, 4, 5, 8]])
if N == 5:
    check('explicit case 0', solve([[1, 1, 8, 7]], 10), [[1, 1, 8, 7]])
    check('explicit case 1', solve([[-3, 2, 12, 2]], 10), [[0, 2, 9, 2]])
    check('explicit case 2', solve([[-2, -2, 11, 11]], 10), [[0, 0, 9, 9]])
    check('explicit case 3', solve([[-3, 0, -1, 9]], 10), [None])
    check('explicit case 4', solve([[0, 0, 9, 9]], 10), [[0, 0, 9, 9]])
    check('explicit case 5', solve([[0, 0, '9.8', 0]], 10), [[0, 0, 9, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 10), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 10), [None])
    check('explicit case 8', solve([[-2, 1, 4, 14]], 10), [[0, 5, 2, 9]])
    check('explicit case 9', solve([[0, '2.5', 9, '2.5']], 10), [[0, 3, 9, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 10), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 13, 0]], 10), [[0, 0, 9, 0]])
    check('explicit case 12', solve([['-9', '-15/2', '18', '33/2']], 10), [[0, 1, 9, 9]])
    check('explicit case 13', solve([[2, 1, 4, 15]], 10), [[2, 1, 3, 9]])
    check('explicit case 14', solve([[3, 12, 1, -2]], 10), [[3, 9, 1, 0]])
    check('explicit case 15', solve([[12, 1, 1, 13]], 10), [[9, 4, 5, 9]])
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
explicit case 0[[1, 1, 4, 3]][[1, 1, 4, 3]]Passed
explicit case 1[[0, 2, 5, 2]][[0, 2, 5, 2]]Passed
explicit case 2[[0, 0, 5, 5]][[0, 0, 5, 5]]Passed
explicit case 3[None][None]Passed
explicit case 4[[0, 0, 5, 5]][[0, 0, 5, 5]]Passed
explicit case 5[[0, 0, 5, 0]][[0, 0, 5, 0]]Passed
explicit case 6[None][None]Passed
explicit case 7[None][None]Passed
explicit case 8[[0, 4, 1, 5]][[0, 4, 1, 5]]Passed
explicit case 9[[0, 3, 5, 3]][[0, 3, 5, 3]]Passed
explicit case 10[[0, 2, 2, 2]][[0, 2, 2, 2]]Passed
explicit case 11[[0, 0, 5, 0]][[0, 0, 5, 0]]Passed
explicit case 12[None][[0, 1, 5, 5]]Failed
explicit case 13[[2, 1, 3, 5]][[2, 1, 3, 5]]Passed
explicit case 14[[2, 5, 2, 5]][[2, 5, 1, 0]]Failed
explicit case 15[[5, 4, 5, 5]][[5, 4, 5, 5]]Passed

SHA-256 / 3ea7bb3cf827bceb7101d49361e8a16a144c8020cac2b8ba3b54c1f9c8189e7d

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
from fractions import Fraction
N = 1
observations = []
def solve(commands, size):
    lo=0
    hi=size-1
    def code(x,y):
        c=0
        if x<lo: c|=1
        elif x>hi: c|=2
        if y<lo: c|=4
        elif y>hi: c|=8
        return c
    out=[]
    for x0,y0,x1,y1 in commands:
        x0,y0,x1,y1=[Fraction(v) for v in (x0,y0,x1,y1)]
        c0,c1=code(x0,y0),code(x1,y1)
        result=None
        for _ in range(5):
            if not (c0|c1):
                result=[int((v+Fraction(1,2))//1) for v in (x0,y0,x1,y1)]
                break
            if c0&c1: break
            c=c0|c1 if c0 and c1 else c0 or c1
            if c&12 and y1==y0 or c&3 and x1==x0: break
            if c&8: x,y=x0+(x1-x0)*(hi-y0)/(y1-y0),Fraction(hi)
            elif c&4: x,y=x0+(x1-x0)*(lo-y0)/(y1-y0),Fraction(lo)
            elif c&2: x,y=Fraction(hi),y0+(y1-y0)*(hi-x0)/(x1-x0)
            else: x,y=Fraction(lo),y0+(y1-y0)*(lo-x0)/(x1-x0)
            if c==c0:
                x0,y0=x,y
                c0=code(x0,y0)
            else:
                x1,y1=x,y
                c1=code(x1,y1)
        out.append(result)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit case 0', solve([[1, 1, 4, 3]], 6), [[1, 1, 4, 3]])
    check('explicit case 1', solve([[-3, 2, 8, 2]], 6), [[0, 2, 5, 2]])
    check('explicit case 2', solve([[-2, -2, 7, 7]], 6), [[0, 0, 5, 5]])
    check('explicit case 3', solve([[-3, 0, -1, 5]], 6), [None])
    check('explicit case 4', solve([[0, 0, 5, 5]], 6), [[0, 0, 5, 5]])
    check('explicit case 5', solve([[0, 0, '5.8', 0]], 6), [[0, 0, 5, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 6), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 6), [None])
    check('explicit case 8', solve([[-2, 1, 4, 10]], 6), [[0, 4, 1, 5]])
    check('explicit case 9', solve([[0, '2.5', 5, '2.5']], 6), [[0, 3, 5, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 6), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 9, 0]], 6), [[0, 0, 5, 0]])
    check('explicit case 12', solve([['-5', '-7/2', '10', '17/2']], 6), [[0, 1, 5, 5]])
    check('explicit case 13', solve([[2, 1, 4, 11]], 6), [[2, 1, 3, 5]])
    check('explicit case 14', solve([[3, 8, 1, -2]], 6), [[2, 5, 1, 0]])
    check('explicit case 15', solve([[8, 1, 1, 9]], 6), [[5, 4, 5, 5]])
if N == 2:
    check('explicit case 0', solve([[1, 1, 5, 4]], 7), [[1, 1, 5, 4]])
    check('explicit case 1', solve([[-3, 2, 9, 2]], 7), [[0, 2, 6, 2]])
    check('explicit case 2', solve([[-2, -2, 8, 8]], 7), [[0, 0, 6, 6]])
    check('explicit case 3', solve([[-3, 0, -1, 6]], 7), [None])
    check('explicit case 4', solve([[0, 0, 6, 6]], 7), [[0, 0, 6, 6]])
    check('explicit case 5', solve([[0, 0, '6.8', 0]], 7), [[0, 0, 6, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 7), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 7), [None])
    check('explicit case 8', solve([[-2, 1, 4, 11]], 7), [[0, 4, 1, 6]])
    check('explicit case 9', solve([[0, '2.5', 6, '2.5']], 7), [[0, 3, 6, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 7), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 10, 0]], 7), [[0, 0, 6, 0]])
    check('explicit case 12', solve([['-6', '-9/2', '12', '21/2']], 7), [[0, 1, 6, 6]])
    check('explicit case 13', solve([[2, 1, 4, 12]], 7), [[2, 1, 3, 6]])
    check('explicit case 14', solve([[3, 9, 1, -2]], 7), [[2, 6, 1, 0]])
    check('explicit case 15', solve([[9, 1, 1, 10]], 7), [[6, 4, 5, 6]])
if N == 3:
    check('explicit case 0', solve([[1, 1, 6, 5]], 8), [[1, 1, 6, 5]])
    check('explicit case 1', solve([[-3, 2, 10, 2]], 8), [[0, 2, 7, 2]])
    check('explicit case 2', solve([[-2, -2, 9, 9]], 8), [[0, 0, 7, 7]])
    check('explicit case 3', solve([[-3, 0, -1, 7]], 8), [None])
    check('explicit case 4', solve([[0, 0, 7, 7]], 8), [[0, 0, 7, 7]])
    check('explicit case 5', solve([[0, 0, '7.8', 0]], 8), [[0, 0, 7, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 8), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 8), [None])
    check('explicit case 8', solve([[-2, 1, 4, 12]], 8), [[0, 5, 1, 7]])
    check('explicit case 9', solve([[0, '2.5', 7, '2.5']], 8), [[0, 3, 7, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 8), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 11, 0]], 8), [[0, 0, 7, 0]])
    check('explicit case 12', solve([['-7', '-11/2', '14', '25/2']], 8), [[0, 1, 7, 7]])
    check('explicit case 13', solve([[2, 1, 4, 13]], 8), [[2, 1, 3, 7]])
    check('explicit case 14', solve([[3, 10, 1, -2]], 8), [[3, 7, 1, 0]])
    check('explicit case 15', solve([[10, 1, 1, 11]], 8), [[7, 4, 5, 7]])
if N == 4:
    check('explicit case 0', solve([[1, 1, 7, 6]], 9), [[1, 1, 7, 6]])
    check('explicit case 1', solve([[-3, 2, 11, 2]], 9), [[0, 2, 8, 2]])
    check('explicit case 2', solve([[-2, -2, 10, 10]], 9), [[0, 0, 8, 8]])
    check('explicit case 3', solve([[-3, 0, -1, 8]], 9), [None])
    check('explicit case 4', solve([[0, 0, 8, 8]], 9), [[0, 0, 8, 8]])
    check('explicit case 5', solve([[0, 0, '8.8', 0]], 9), [[0, 0, 8, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 9), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 9), [None])
    check('explicit case 8', solve([[-2, 1, 4, 13]], 9), [[0, 5, 2, 8]])
    check('explicit case 9', solve([[0, '2.5', 8, '2.5']], 9), [[0, 3, 8, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 9), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 12, 0]], 9), [[0, 0, 8, 0]])
    check('explicit case 12', solve([['-8', '-13/2', '16', '29/2']], 9), [[0, 1, 8, 8]])
    check('explicit case 13', solve([[2, 1, 4, 14]], 9), [[2, 1, 3, 8]])
    check('explicit case 14', solve([[3, 11, 1, -2]], 9), [[3, 8, 1, 0]])
    check('explicit case 15', solve([[11, 1, 1, 12]], 9), [[8, 4, 5, 8]])
if N == 5:
    check('explicit case 0', solve([[1, 1, 8, 7]], 10), [[1, 1, 8, 7]])
    check('explicit case 1', solve([[-3, 2, 12, 2]], 10), [[0, 2, 9, 2]])
    check('explicit case 2', solve([[-2, -2, 11, 11]], 10), [[0, 0, 9, 9]])
    check('explicit case 3', solve([[-3, 0, -1, 9]], 10), [None])
    check('explicit case 4', solve([[0, 0, 9, 9]], 10), [[0, 0, 9, 9]])
    check('explicit case 5', solve([[0, 0, '9.8', 0]], 10), [[0, 0, 9, 0]])
    check('explicit case 6', solve([[1, -4, -2, 2]], 10), [None])
    check('explicit case 7', solve([[-2, 1, 3, -4]], 10), [None])
    check('explicit case 8', solve([[-2, 1, 4, 14]], 10), [[0, 5, 2, 9]])
    check('explicit case 9', solve([[0, '2.5', 9, '2.5']], 10), [[0, 3, 9, 3]])
    check('explicit case 10', solve([[0, '1.5', 2, '1.5']], 10), [[0, 2, 2, 2]])
    check('explicit case 11', solve([[0, 0, 13, 0]], 10), [[0, 0, 9, 0]])
    check('explicit case 12', solve([['-9', '-15/2', '18', '33/2']], 10), [[0, 1, 9, 9]])
    check('explicit case 13', solve([[2, 1, 4, 15]], 10), [[2, 1, 3, 9]])
    check('explicit case 14', solve([[3, 12, 1, -2]], 10), [[3, 9, 1, 0]])
    check('explicit case 15', solve([[12, 1, 1, 13]], 10), [[9, 4, 5, 9]])
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
explicit case 0[[1, 1, 4, 3]][[1, 1, 4, 3]]Passed
explicit case 1[[0, 2, 5, 2]][[0, 2, 5, 2]]Passed
explicit case 2[[0, 0, 5, 5]][[0, 0, 5, 5]]Passed
explicit case 3[None][None]Passed
explicit case 4[[0, 0, 5, 5]][[0, 0, 5, 5]]Passed
explicit case 5[[0, 0, 5, 0]][[0, 0, 5, 0]]Passed
explicit case 6[None][None]Passed
explicit case 7[None][None]Passed
explicit case 8[[0, 4, 1, 5]][[0, 4, 1, 5]]Passed
explicit case 9[[0, 3, 5, 3]][[0, 3, 5, 3]]Passed
explicit case 10[[0, 2, 2, 2]][[0, 2, 2, 2]]Passed
explicit case 11[[0, 0, 5, 0]][[0, 0, 5, 0]]Passed
explicit case 12[None][[0, 1, 5, 5]]Failed
explicit case 13[[2, 1, 3, 5]][[2, 1, 3, 5]]Passed
explicit case 14[[2, 5, 2, 5]][[2, 5, 1, 0]]Failed
explicit case 15[[5, 4, 5, 5]][[5, 4, 5, 5]]Passed

SHA-256 / 031f4bcf6f62aa4c381fd264e746477964a1ffc51b77ade827ae41d744a7e517

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 16 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.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

Sign in to the archive ↗

Verification & scope

Exact integer/rational arithmetic on small stipulated fixtures models the clipping decision only; no memory layout, GPU pipeline, graphics API or standards conformance is claimed. 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 2026-09-29T14:45:20.153806+00:00.

Case digest / fa91a0d632dc6a1b13a5669fa3b70fa1ef3b1fcbf906276ac9e3c04cedd71d12