38 lines
1.4 KiB
HTML
38 lines
1.4 KiB
HTML
<!DOCTYPE html>
|
|
<title>PNG test: eXIf chunk</title>
|
|
<link rel="help" href="https://w3c.github.io/PNG-spec/#eXIf">
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<script src="/html/canvas/resources/canvas-tests.js"></script>
|
|
<body>
|
|
|
|
<h1>eXIf chunk</h1>
|
|
<p class="desc">test pixel values of a rotated PNG</p>
|
|
|
|
<p class="output">Actual output:</p>
|
|
<canvas id="c" class="output" width="200" height="200"><p class="fallback">FAIL (fallback content)</p></canvas>
|
|
|
|
<ul id="d"></ul>
|
|
<script>
|
|
var t = async_test("test pixel values of a rotated PNG");
|
|
const img = new Image();
|
|
img.onload = () => {
|
|
_addTest(function(canvas, ctx) {
|
|
ctx.drawImage(img, 0, 0);
|
|
|
|
var pixel = ctx.getImageData(5, 5, 1, 1).data;
|
|
|
|
// The image data stores a 100x100 red block above a 100x100 green block.
|
|
// By rotating the image, we can put the green block on top.
|
|
const pixel_expected = [0, 255, 0, 255];
|
|
const epsilon = 2;
|
|
|
|
_assertSame(pixel.length, pixel_expected.length, "pixel.length", "pixel_expected.length");
|
|
assert_approx_equals(pixel[0], pixel_expected[0], epsilon);
|
|
assert_approx_equals(pixel[1], pixel_expected[1], epsilon);
|
|
assert_approx_equals(pixel[2], pixel_expected[2], epsilon);
|
|
assert_approx_equals(pixel[3], pixel_expected[3], epsilon);
|
|
});
|
|
};
|
|
img.src = "support/exif-orientation-bottom-right.png";
|
|
</script>
|