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Quelle exif-chunk.html Sprache: HTML |
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<!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 c <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.le 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>
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2026-04-02