firefox/testing/web-platform/tests/css/geometry/DOMMatrix2DInit-validate-fixup.html

<!DOCTYPE html>
<title>Geometry Interfaces: DOMMatrix2DInit validate and fixup</title>
<link rel="help" href="https://drafts.fxtf.org/geometry/#dommatrixinit-dictionary">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-context-2d-settransform">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/dommatrix-test-util.js"></script>
<canvas id=canvas hidden></canvas>
<script>
setup(() => {
  window.canvas = document.getElementById('canvas');
  window.ctx = canvas.getContext('2d');
  window.ctx.fillStyle = '#000';
});

function clearCanvas(ctx) {
  ctx.resetTransform();
  ctx.clearRect(0, 0, window.canvas.width, window.canvas.height);
}

function drawRectWithSetTransform(ctx, transform) {
  clearCanvas(ctx);
  ctx.setTransform(transform);
  ctx.fillRect(20, 20, 30, 30);
  return window.canvas.toDataURL();
}

function drawRectWithAddPathTransform(ctx, transform) {
  clearCanvas(ctx);
  var path = new Path2D();
  path.rect(20, 20, 30, 30);
  var transformedPath = new Path2D();
  if (transform === undefined) {
    transformedPath.addPath(path);
  } else {
    transformedPath.addPath(path, transform);
  }
  ctx.fill(transformedPath);
  return window.canvas.toDataURL();
}

var emptyCanvasURL = window.canvas.toDataURL();

[
  {a: 1, m11: 2},
  {b: 0, m12: -1},
  {c: Infinity, m21: -Infinity},
  {d: 0, m22: NaN},
  {e: 1, m41: 1.00000001},
  {f: 0, m42: Number.MIN_VALUE},
].forEach(dict => {
  test(() => {
    ctx.resetTransform();
    assert_throws_js(TypeError, () => ctx.setTransform(dict));
  }, `setTransform(${format_dict(dict)}) (invalid)`);

  test(() => {
    assert_throws_js(TypeError, () => drawRectWithAddPathTransform(ctx, dict));
  }, `addPath(${format_dict(dict)}) (invalid)`);
});

test(() => {
  ctx.resetTransform();
  ctx.setTransform(1, 2, 3, 4, 5, 6);
  const matrix = ctx.getTransform();
  checkMatrix(matrix, matrix2D({m11: 1, m12: 2, m21: 3, m22: 4, m41: 5, m42: 6}));
}, `setTransform (Sanity check without dictionary)`);

test(() => {
  var ident = matrix2D({});
  var expectedResultURL = drawRectWithSetTransform(ctx, ident);
  var actualResultURL = drawRectWithAddPathTransform(ctx);
  assert_equals(actualResultURL, expectedResultURL);
}, `addPath (Sanity check without second parameter)`);

[
  // Input dict that are 2D
  [{},                             matrix2D({})],
  [{is2D: undefined},              matrix2D({})],
  [{a: 1, m11: 1},                 matrix2D({m11: 1})],
  [{b: 0, m12: undefined},         matrix2D({m12: 0})],
  [{c: 0, m21: 0},                 matrix2D({m21: 0})],
  [{c: 0, m21: -0},                matrix2D({m21: -0})],
  [{c: -0, m21: 0},                matrix2D({m21: 0})],
  [{c: -0, m21: -0},               matrix2D({m21: -0})],
  [{d: Infinity, m22: Infinity},   null], // setTransform: silently ignore / addPath: silently halt
  [{e: -Infinity, m41: -Infinity}, null], // setTransform: silently ignore / addPath: silently halt
  [{f: NaN, m42: NaN},             null], // setTransform: silently ignore / addPath: silently halt
  [{f: NaN, m42: NaN, is2D: true}, null], // setTransform: silently ignore / addPath: silently halt
  [{f: 0, m42: null},              matrix2D({m42: 0})], // null is converted to 0
  [{f: -0, m42: null},             matrix2D({m42: 0})], // null is converted to 0
  [{a: 2},                         matrix2D({m11: 2})],
  [{b: 2},                         matrix2D({m12: 2})],
  [{c: 2},                         matrix2D({m21: 2})],
  [{d: 2},                         matrix2D({m22: 2})],
  [{e: 2},                         matrix2D({m41: 2})],
  [{f: 2},                         matrix2D({m42: 2})],
  [{a: -0, b: -0, c: -0, d: -0, e: -0, f: -0},
                                   matrix2D({m11: -0, m12: -0, m21: -0, m22: -0, m41: -0, m42: -0})],
  [{a: -0, b: -0, c: -0, d: -0, e: -0, f: -0, is2D: true},
                                   matrix2D({m11: -0, m12: -0, m21: -0, m22: -0, m41: -0, m42: -0})],
  [{m11:2},                        matrix2D({m11: 2})],
  [{m12:2},                        matrix2D({m12: 2})],
  [{m21:2},                        matrix2D({m21: 2})],
  [{m22:2},                        matrix2D({m22: 2})],
  [{m41:2},                        matrix2D({m41: 2})],
  [{m42:2},                        matrix2D({m42: 2})],
  [{m11: -0, m12: -0, m21: -0, m22: -0, m41: -0, m42: -0},
                                   matrix2D({m11: -0, m12: -0, m21: -0, m22: -0, m41: -0, m42: -0})],
  [{m11: -0, m12: -0, m21: -0, m22: -0, m41: -0, m42: -0, is2D: true},
                                   matrix2D({m11: -0, m12: -0, m21: -0, m22: -0, m41: -0, m42: -0})],
  [{m13: 0, is2D: true},           matrix2D({})],
  [{m13: -0, is2D: true},          matrix2D({})],
  [{m14: 0, is2D: true},           matrix2D({})],
  [{m14: -0, is2D: true},          matrix2D({})],
  [{m23: 0, is2D: true},           matrix2D({})],
  [{m23: -0, is2D: true},          matrix2D({})],
  [{m24: 0, is2D: true},           matrix2D({})],
  [{m24: -0, is2D: true},          matrix2D({})],
  [{m31: 0, is2D: true},           matrix2D({})],
  [{m31: -0, is2D: true},          matrix2D({})],
  [{m32: 0, is2D: true},           matrix2D({})],
  [{m32: -0, is2D: true},          matrix2D({})],
  [{m33: 1, is2D: true},           matrix2D({})],
  [{m34: 0, is2D: true},           matrix2D({})],
  [{m34: -0, is2D: true},          matrix2D({})],
  [{m43: 0, is2D: true},           matrix2D({})],
  [{m43: -0, is2D: true},          matrix2D({})],
  [{m44: 1, is2D: true},           matrix2D({})],
  [{is2D: true},                   matrix2D({})],
].forEach(([dict, expected]) => {
  test(() => {
    ctx.resetTransform();
    ctx.setTransform(dict);
    const matrix = ctx.getTransform();
    checkMatrix(matrix, expected || matrix2D({}));
  }, `setTransform(${format_dict(dict)})`);

  test(() => {
    var expectedResultURL = expected ?
      drawRectWithSetTransform(ctx, expected) :
      emptyCanvasURL;
    var actualResultURL = drawRectWithAddPathTransform(ctx, dict);
    assert_equals(actualResultURL, expectedResultURL);
  }, `addPath(${format_dict(dict)})`);
 });
</script>