2 <title>Canvas.drawImage with narrow destination.</title>
3 <script src="../resources/js-test.js"></script>
5 function verifyCovered(imgData, offset, stride, length) {
7 if (imgData[offset + 3] === 0)
15 ImageData.prototype.pixelOffset = function(x, y) {
16 return (x + y * this.width) * 4;
19 var sourceImage = document.createElement("canvas");
20 sourceImage.height = sourceImage.width = 1;
21 sourceImage.getContext("2d").fillRect(0, 0, 1, 1);
23 var c = document.createElement("canvas");
24 c.width = c.height = 100;
25 var ctx = c.getContext("2d");
27 // Thin horizontal image.
28 ctx.drawImage(sourceImage, 10, 5.5, 10, 0.95);
30 // Thin vertical image.
31 ctx.drawImage(sourceImage, 5.5, 5, 0.95, 10);
35 ctx.translate(20, 15);
36 ctx.rotate(Math.PI / 2);
37 ctx.drawImage(sourceImage, 0, -.5, 10, 0.95);
40 // Rotated -90 degrees
42 ctx.translate(25, 15);
43 ctx.rotate(-Math.PI / 2);
44 ctx.drawImage(sourceImage, -.5, 0, 0.95, 10);
47 imgData = ctx.getImageData(0, 0, c.width, c.height);
48 shouldBeTrue("verifyCovered(imgData.data, imgData.pixelOffset(10, 5), 1, 10)");
49 shouldBeTrue("verifyCovered(imgData.data, imgData.pixelOffset(5, 5), imgData.width, 10)");
50 shouldBeTrue("verifyCovered(imgData.data, imgData.pixelOffset(25, 15), 1, 10)");
51 shouldBeTrue("verifyCovered(imgData.data, imgData.pixelOffset(20, 15), imgData.width, 10)");
53 successfullyParsed = true;