canvas-clip-rule.html | Explore in Territory

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>
var tmpimg = document.createElement('canvas');
tmpimg.width = 200;
tmpimg.height = 200;
ctx = tmpimg.getContext('2d');
    
// Create the image for blending test with images.
var img = document.createElement('canvas');
img.width = 100;
img.height = 100;
var imgCtx = img.getContext('2d');

function checkResult(expectedColors, sigma) {
    var data = ctx.getImageData(50, 50, 1, 1).data;
    for (var i = 0; i < 4; i++)
        assert_approx_equals(data[i], expectedColors[i], sigma);
}
    
test(function(t) {
    ctx.fillStyle = 'rgb(255,0,0)';
    ctx.fillRect(0, 0, 100, 100);
    ctx.fillStyle = 'rgb(0,255,0)';
    ctx.beginPath();
    ctx.rect(0, 0, 100, 100);
    ctx.rect(25, 25, 50, 50);
    ctx.clip();
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    checkResult([0, 255, 0, 255], 5);            
    
    ctx.fillStyle = 'rgb(255,0,0)';
    ctx.fillRect(0, 0, 100, 100);
    ctx.fillStyle = 'rgb(0,255,0)';
    ctx.beginPath();
    ctx.rect(0, 0, 100, 100);
    ctx.rect(25, 25, 50, 50);
    ctx.clip('nonzero');
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    checkResult([0, 255, 0, 255], 5);
    
    ctx.fillStyle = 'rgb(255,0,0)';
    ctx.fillRect(0, 0, 100, 100);
    ctx.fillStyle = 'rgb(0,255,0)';
    ctx.beginPath();
    ctx.rect(0, 0, 100, 100);
    ctx.rect(25, 25, 50, 50);
    ctx.clip('evenodd');
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    checkResult([255, 0, 0, 255], 5);            
}, "Series of tests to ensure correct results of the winding rule.");
</script>
</body>
chromium/third_party/blink/web_tests/fast/canvas/canvas-clip-rule.html
