<!DOCTYPE html>
<meta charset="UTF-8">
<title>transform composition</title>
<link rel="help" href="https://drafts.csswg.org/css-transforms/#transform-property">
<meta name="assert" content="transform supports animation as a transform list">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<body>
<script>
// This file contains tests for the composition behavior of transforms that is
// unrelated to the individual transform functions. For the transform functions
// themselves, see the transform-*-composition.html subtests.

// ------------------ Addition -----------------
test_composition({
  property: 'transform',
  underlying: 'rotateX(100deg) rotateY(100deg)',
  addFrom: 'translate(10px, 20px)',
  replaceTo: 'rotateX(200deg) rotateY(200deg) translate(110px, 220px)',
}, [
  {at: -0.5, expect: 'rotateX(50deg) rotateY(50deg) translate(-40px, -80px)'},
  {at: 0, expect: 'rotateX(100deg) rotateY(100deg) translate(10px, 20px)'},
  {at: 0.25, expect: 'rotateX(125deg) rotateY(125deg) translate(35px, 70px)'},
  {at: 0.5, expect: 'rotateX(150deg) rotateY(150deg) translate(60px, 120px)'},
  {at: 0.75, expect: 'rotateX(175deg) rotateY(175deg) translate(85px, 170px)'},
  {at: 1, expect: 'rotateX(200deg) rotateY(200deg) translate(110px, 220px)'},
  {at: 1.5, expect: 'rotateX(250deg) rotateY(250deg) translate(160px, 320px)'},
]);

// Shorter list is extended with corresponding identity transforms for pairwise
// interpolation.
test_composition({
  property: 'transform',
  underlying: 'rotateX(45deg)',
  addFrom: 'none',
  addTo: 'rotateY(360deg)',
}, [
  {at: -0.5, expect: 'rotateX(45deg) rotateY(-180deg)'},
  {at: 0, expect: 'rotateX(45deg) rotateY(0deg)'},
  {at: 0.25, expect: 'rotateX(45deg) rotateY(90deg)'},
  {at: 0.5, expect: 'rotateX(45deg) rotateY(180deg)'},
  {at: 0.75, expect: 'rotateX(45deg) rotateY(270deg)'},
  {at: 1, expect: 'rotateX(45deg) rotateY(360deg)'},
  {at: 1.5, expect: 'rotateX(45deg) rotateY(540deg)'},
]);

// Matrix decomposition cases
test_composition({
  property: 'transform',
  underlying: 'rotateX(90deg)',
  addFrom: 'translate(100px, 100px)',
  addTo: 'scale(2)',
}, [
  {at: -0.5, expect: 'matrix3d(0.5, 0, 0, 0, 0, 1.11022e-16, 0.5, 0, 0, -1, 2.22045e-16, 0, 150, 9.18485e-15, 150, 1)'},
  {at: 0, expect: 'matrix3d(1, 0, 0, 0, 0, 6.12323e-17, 1, 0, 0, -1, 6.12323e-17, 0, 100, 6.12323e-15, 100, 1)'},
  {at: 0.25, expect: 'matrix3d(1.25, 0, 0, 0, 0, 2.77556e-16, 1.25, 0, 0, -1, 2.22045e-16, 0, 75, 4.59243e-15, 75, 1)'},
  {at: 0.5, expect: 'matrix3d(1.5, 0, 0, 0, 0, 3.33067e-16, 1.5, 0, 0, -1, 2.22045e-16, 0, 50, 3.06162e-15, 50, 1)'},
  {at: 0.75, expect: 'matrix3d(1.75, 0, 0, 0, 0, 3.88578e-16, 1.75, 0, 0, -1, 2.22045e-16, 0, 25, 1.53081e-15, 25, 1)'},
  {at: 1, expect: 'matrix3d(2, 0, 0, 0, 0, 1.22465e-16, 2, 0, 0, -1, 6.12323e-17, 0, 0, 0, 0, 1)'},
  {at: 1.5, expect: 'matrix3d(2.5, 0, 0, 0, 0, 5.55112e-16, 2.5, 0, 0, -1, 2.22045e-16, 0, -50, -3.06162e-15, -50, 1)'},
]);

// Force a fallback to matrix interpolation.
test_composition({
  property: 'transform',
  underlying: 'rotateX(45deg)',
  addFrom: 'scaleX(1)',
  addTo: 'rotateY(360deg)',
}, [
  {at: -0.5, expect: 'rotateX(45deg)'},
  {at: 0, expect: 'rotateX(45deg)'},
  {at: 0.25, expect: 'rotateX(45deg)'},
  {at: 0.5, expect: 'rotateX(45deg)'},
  {at: 0.75, expect: 'rotateX(45deg)'},
  {at: 1, expect: 'rotateX(45deg)'},
  {at: 1.5, expect: 'rotateX(45deg)'},
]);

// ------------------ Accumulation -----------------

// TODO(smcgruer): Add tests for accumulation behaviors.
</script>
</body>
