Support CanvasPattern.setTransform

LayoutTests/fast/canvas/script-tests/canvas-pattern-set-transform.js

+description("Test for supporting setTransform on canvas patterns");
+
+function pixelValueAt(context, x, y) {
+    var imageData = context.getImageData(x, y, 1, 1);
+    return imageData.data;
+}
+
+function pixelToString(p) {
+    return "[" + p[0] + ", " + p[1] + ", " + p[2] + ", " + p[3] + "]"
+}
+
+function pixelShouldBe(context, x, y, expectedPixelString) {
+    var pixel = pixelValueAt(context, x, y);
+    var expectedPixel = eval(expectedPixelString);
+
+    var pixelString = "pixel " + x + ", " + y;
+    if (areArraysEqual(pixel, expectedPixel)) {
+        testPassed(pixelString + " is " + pixelToString(pixel));
+    } else {
+        testFailed(pixelString + " should be " + pixelToString(expectedPixel) + " was " + pixelToString(pixel));
+    }
+}
+
+function fillWithColor(context, canvas, color1, color2) {
+    context.save();
+    context.fillStyle = color1;
+    context.fillRect(0, 0, canvas.width / 2, canvas.height);
+    context.fillStyle = color2;
+    context.fillRect(canvas.width / 2, 0, canvas.width / 2, canvas.height);
+    context.restore();
+}
+
+var canvas = document.createElement("canvas");
+canvas.height = 100;
+canvas.width = 100;
+canvas.style.height = "100";
+canvas.style.width = "100";
+
+document.body.appendChild(canvas);
+
+var patternImage = document.createElement("canvas");
+patternImage.height = 10;
+patternImage.width = 20;
+var patternImageCtx = patternImage.getContext('2d');
+fillWithColor(patternImageCtx, patternImage, "red", "green");
+var greenPixel = pixelValueAt(patternImageCtx, 10, 0);
+
+
+var ctx = canvas.getContext('2d');
+var pattern = ctx.createPattern(patternImage, "repeat-x");
+var svgElement = document.createElementNS("http://www.w3.org/2000/svg", "svg");
+var matrix = svgElement.createSVGMatrix();
+matrix = matrix.translate(10, 0);
+pattern.setTransform(matrix);
+
+fillWithColor(ctx, canvas, "blue", "blue");
+
+ctx.fillStyle = pattern;
+ctx.translate(20, 20);
+ctx.fillRect(0, 0, 10, 10);
+pixelShouldBe(ctx, 20, 20, "greenPixel");