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119 lines
4.3 KiB
HTML
119 lines
4.3 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>CanvasRenderingContext2D imageSmoothingEnabled test</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#image-smoothing">
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<script>
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function createTestImage() {
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var image = document.createElement('canvas');
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var imgctx = image.getContext('2d');
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imgctx.fillStyle = "#F00";
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imgctx.fillRect(0, 0, 2, 2);
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imgctx.fillStyle = "#0F0";
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imgctx.fillRect(0, 0, 1, 1);
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return image;
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}
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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assert_true(ctx.imageSmoothingEnabled);
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}, "When the canvas context is created, imageSmoothingEnabled must be set to true.");
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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ctx.imageSmoothingEnabled = false;
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assert_false(ctx.imageSmoothingEnabled);
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}, "On getting imageSmoothingEnabled, the user agent must return the last value it was set to.");
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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var image = createTestImage();
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ctx.scale(10, 10);
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ctx.drawImage(image, 0, 0);
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var pixels = ctx.getImageData(9, 9, 1, 1).data;
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assert_not_equals(pixels[0], 0);
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assert_not_equals(pixels[1], 255);
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}, "Test that image smoothing is actually on by default and just the attribute value.");
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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ctx.imageSmoothingEnabled = true;
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var image = createTestImage();
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ctx.scale(10, 10);
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ctx.drawImage(image, 0, 0);
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var pixels = ctx.getImageData(9, 9, 1, 1).data;
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assert_not_equals(pixels[0], 0);
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assert_not_equals(pixels[1], 255);
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}, "Test that image smoothing works when imageSmoothingEnabled is set to true");
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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var image = createTestImage();
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ctx.imageSmoothingEnabled = false;
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ctx.scale(10, 10);
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ctx.drawImage(image, 0, 0);
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var pixels = ctx.getImageData(9, 9, 1, 1).data;
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assert_array_equals(pixels, [0, 255, 0, 255]);
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}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with drawImage().");
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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var image = createTestImage();
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ctx.imageSmoothingEnabled = false;
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ctx.scale(10, 10);
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ctx.fillStyle = ctx.createPattern(image, 'repeat');
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ctx.fillRect(0, 0, 10, 10);
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var pixels = ctx.getImageData(9, 9, 1, 1).data;
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assert_array_equals(pixels, [0, 255, 0, 255]);
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}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with fillRect and createPattern().");
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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var image = createTestImage();
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ctx.imageSmoothingEnabled = false;
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ctx.fillStyle = ctx.createPattern(image, 'repeat');
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ctx.scale(10, 10);
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ctx.rect(0, 0, 10, 10);
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ctx.fill();
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var pixels = ctx.getImageData(9, 9, 1, 1).data;
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assert_array_equals(pixels, [0, 255, 0, 255]);
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}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with fill() and createPattern().");
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test(function() {
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var ctx = document.createElement('canvas').getContext('2d');
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var image = createTestImage();
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ctx.strokeStyle = ctx.createPattern(image, 'repeat');
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ctx.lineWidth = 5;
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ctx.imageSmoothingEnabled = false;
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ctx.scale(10, 10);
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ctx.beginPath();
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ctx.moveTo(0, 0);
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ctx.lineTo(10, 10);
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ctx.stroke();
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var pixels = ctx.getImageData(9, 9, 1, 1).data;
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assert_array_equals(pixels, [0, 255, 0, 255]);
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}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with stroke() and createPattern().");
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test(function() {
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var repaints = 5;
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var ctx = document.createElement('canvas').getContext('2d');
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function draw() {
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ctx.clearRect(0, 0, 10, 10);
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ctx.setTransform(1, 0, 0, 1, 0, 0);
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var image = createTestImage();
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ctx.imageSmoothingEnabled = false;
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ctx.scale(10, 10);
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ctx.drawImage(image, 0, 0);
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var pixels = ctx.getImageData(9, 9, 1, 1).data;
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assert_array_equals(pixels, [0, 255, 0, 255]);
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}
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while (repaints > 0) {
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draw();
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repaints = repaints - 1;
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}
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}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) still works after repaints.");
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</script>
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