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- This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/the-canvas-state/2d.state.saverestore.globalCompositeOperation.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<meta charset="UTF-8">
<title>Canvas test: 2d.state.saverestore.globalCompositeOperation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<h1>2d.state.saverestore.globalCompositeOperation</h1>
<script>
test(t => {
const canvas = document.createElement('canvas');
canvas.width = 300;
canvas.height = 150;
const ctx = canvas.getContext('2d');
const old = ctx.globalCompositeOperation;
ctx.save();
ctx.globalCompositeOperation = "copy";
ctx.restore();
_assertSame(ctx.globalCompositeOperation, old, "ctx.globalCompositeOperation", "old");
}, "save()/restore() restores globalCompositeOperation, for a canvas of size (300, 150).");
test(t => {
const canvas = document.createElement('canvas');
canvas.width = 300;
canvas.height = 150;
const ctx = canvas.getContext('2d');
ctx.globalCompositeOperation = "copy";
const old = ctx.globalCompositeOperation;
// We're not interested in failures caused by get(set(x)) != x (e.g.
// from rounding), so compare against `old` instead of "copy".
ctx.save();
_assertSame(ctx.globalCompositeOperation, old, "ctx.globalCompositeOperation", "old");
ctx.restore();
}, "save() does not modify globalCompositeOperation, for a canvas of size (300, 150).");
test(t => {
const canvas = document.createElement('canvas');
canvas.width = 0;
canvas.height = 0;
const ctx = canvas.getContext('2d');
const old = ctx.globalCompositeOperation;
ctx.save();
ctx.globalCompositeOperation = "copy";
ctx.restore();
_assertSame(ctx.globalCompositeOperation, old, "ctx.globalCompositeOperation", "old");
}, "save()/restore() restores globalCompositeOperation, for a canvas of size (0, 0).");
test(t => {
const canvas = document.createElement('canvas');
canvas.width = 0;
canvas.height = 0;
const ctx = canvas.getContext('2d');
ctx.globalCompositeOperation = "copy";
const old = ctx.globalCompositeOperation;
// We're not interested in failures caused by get(set(x)) != x (e.g.
// from rounding), so compare against `old` instead of "copy".
ctx.save();
_assertSame(ctx.globalCompositeOperation, old, "ctx.globalCompositeOperation", "old");
ctx.restore();
}, "save() does not modify globalCompositeOperation, for a canvas of size (0, 0).");
</script>