canvas-strokePath-gradient-shadow.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>
// Ensure correct behavior of canvas with strokePath using a gradient strokeStyle and a shadow.

var canvas = document.createElement('canvas');
document.body.appendChild(canvas);
canvas.setAttribute('width', '600');
canvas.setAttribute('height', '1100');
var ctx = canvas.getContext('2d');

var gradient = ctx.createLinearGradient(0, 0, 300, 0);
gradient.addColorStop(0, 'rgba(0, 0, 255, 0.5)');
gradient.addColorStop(1, 'rgba(0, 0, 255, 0.5)');

ctx.save();
ctx.strokeStyle = gradient;
ctx.shadowColor = 'rgba(255, 0, 0, 0.5)';
ctx.shadowOffsetX = 250;
ctx.lineWidth = 25;

var side = 200;

// Alpha shadow.
ctx.shadowBlur = 0;
ctx.beginPath();
ctx.rect(50, 50, side, side);
ctx.stroke();

// Blurry shadow.
ctx.shadowBlur = 10;
ctx.beginPath();
ctx.rect(50, 300, side, side);
ctx.stroke();

ctx.rotate(Math.PI / 2);

// Rotated alpha shadow.
ctx.shadowBlur = 0;
ctx.beginPath();
ctx.rect(550, -250, side, side);
ctx.stroke();

// Rotated blurry shadow.
ctx.shadowBlur = 10;
ctx.beginPath();
ctx.rect(800, -250, side, side);
ctx.stroke();

ctx.restore();

var imageData, data;
ctx.fillStyle = 'black';

function testPixelAlphaShadow(x, y, color, rgbTolerance)
{
    var data = ctx.getImageData(x, y, 1, 1).data;
    for (i = 0; i < 3; i++)
        assert_approx_equals(data[i]*data[3]/255, color[i]*color[3]/255, rgbTolerance);

    // Plot test point.
    ctx.fillRect(x, y, 3, 3);
}

var rgbTolerance = 4;
var testScenarios = [
    ['Verify alpha shadow 1' , 400, 150, [0, 0, 0, 0], 0],
    ['Verify alpha shadow 2' , 400, 75, [0, 0, 0, 0], 0],
    ['Verify alpha shadow 3' , 400, 225, [0, 0, 0, 0], 0],
    ['Verify alpha shadow 4' , 325, 150, [0, 0, 0, 0], 0],
    ['Verify alpha shadow 5' , 475, 150, [0, 0, 0, 0], 0],
    ['Verify alpha shadow 6' , 400, 50, [255, 0, 0, 64], rgbTolerance],
    ['Verify alpha shadow 7' , 500, 150, [255, 0, 0, 64], rgbTolerance],
    ['Verify alpha shadow 8' , 400, 250, [255, 0, 0, 64], rgbTolerance],
    ['Verify alpha shadow 9' , 300, 150, [255, 0, 0, 64], rgbTolerance],
    ['Verify alpha shadow 10' , 400, 25, [0, 0, 0, 0], 0],
    ['Verify alpha shadow 11' , 525, 150, [0, 0, 0, 0], 0],
    ['Verify alpha shadow 12' , 400, 275, [0, 0, 0, 0], rgbTolerance],
    ['Verify alpha shadow 13' , 275, 150, [0, 0, 0, 0], rgbTolerance],

    ['Verify blurry shadow 1' , 400, 400, [0, 0, 0, 0], 0],
    ['Verify blurry shadow 2' , 400, 325, [0, 0, 0, 0], rgbTolerance],
    ['Verify blurry shadow 3' , 475, 400, [0, 0, 0, 0], rgbTolerance],
    ['Verify blurry shadow 4' , 400, 475, [0, 0, 0, 0], rgbTolerance],
    ['Verify blurry shadow 5' , 325, 400, [0, 0, 0, 0], rgbTolerance],
    ['Verify blurry shadow 6' , 400, 300, [255, 0, 0, 64], rgbTolerance],
    ['Verify blurry shadow 7' , 400, 500, [255, 0, 0, 64], rgbTolerance],
    ['Verify blurry shadow 8' , 300, 400, [255, 0, 0, 64], rgbTolerance],
    ['Verify blurry shadow 9' , 500, 400, [255, 0, 0, 64], rgbTolerance],
    ['Verify blurry shadow 10' , 525, 400, [0, 0, 0, 0], rgbTolerance],
    ['Verify blurry shadow 11' , 275, 400, [0, 0, 0, 0], rgbTolerance],

    ['Verify rotated alpha shadow 1' , 400, 650, [0, 0, 0, 0], 0],
    ['Verify rotated alpha shadow 2' , 400, 575, [0, 0, 0, 0], 0],
    ['Verify rotated alpha shadow 3' , 400, 725, [0, 0, 0, 0], 0],
    ['Verify rotated alpha shadow 4' , 325, 650, [0, 0, 0, 0], 0],
    ['Verify rotated alpha shadow 5' , 475, 650, [0, 0, 0, 0], 0],
    ['Verify rotated alpha shadow 6' , 400, 550, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated alpha shadow 7' , 500, 650, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated alpha shadow 8' , 400, 750, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated alpha shadow 9' , 300, 650, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated alpha shadow 10' , 400, 525, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated alpha shadow 11' , 525, 650, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated alpha shadow 12' , 400, 775, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated alpha shadow 13' , 275, 650, [0, 0, 0, 0], 0],

    ['Verify rotated blurry shadow 1' , 400, 900, [0, 0, 0, 0], 0],
    ['Verify rotated blurry shadow 2' , 400, 825, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated blurry shadow 3' , 475, 900, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated blurry shadow 4' , 400, 975, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated blurry shadow 5' , 325, 900, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated blurry shadow 6' , 400, 800, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated blurry shadow 7' , 400, 1000, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated blurry shadow 8' , 300, 900, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated blurry shadow 9' , 500, 900, [255, 0, 0, 64], rgbTolerance],
    ['Verify rotated blurry shadow 10' , 525, 900, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated blurry shadow 11' , 275, 900, [0, 0, 0, 0], rgbTolerance],
    ['Verify rotated blurry shadow 12' , 400, 1025, [0, 0, 0, 0], rgbTolerance],
];

generate_tests(testPixelAlphaShadow, testScenarios);

</script>
</body>
chromium/third_party/blink/web_tests/fast/canvas/canvas-strokePath-gradient-shadow.html
