Implement ImageData constructors.

LayoutTests/fast/canvas/script-tests/canvas-ImageData.js

Index: LayoutTests/fast/canvas/script-tests/canvas-ImageData.js
diff --git a/LayoutTests/fast/canvas/script-tests/canvas-ImageData.js b/LayoutTests/fast/canvas/script-tests/canvas-ImageData.js
new file mode 100644
index 0000000000000000000000000000000000000000..bc9568b13374c10745e183cc84aa7c52d2de1ba4
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+++ b/LayoutTests/fast/canvas/script-tests/canvas-ImageData.js
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+description("Test ImageData constructor");
+
+function setRGBA(imageData, i, rgba) {
+    var s = i * 4;
+    imageData[s] = rgba[0];
+    imageData[s + 1] = rgba[1];
+    imageData[s + 2] = rgba[2];
+    imageData[s + 3] = rgba[3];
+}
+
+function getRGBA(imageData, i) {
+    var result = [];
+    var s = i * 4;
+    for (var j = 0; j < 4; j++) {
+        result[j] = imageData[s + j];
+    }
+    return result;
+}
+
+shouldBeDefined("ImageData");
+shouldBe("ImageData.length", "2");
+
+imageData = new ImageData(100, 50);
+
+shouldBeNonNull("imageData");
+shouldBeNonNull("imageData.data");
+shouldBe("imageData.width", "100");
+shouldBe("imageData.height", "50");
+shouldBe("getRGBA(imageData.data, 4)", "[0, 0, 0, 0]");
+
+var testColor = [0, 255, 255, 128];
+setRGBA(imageData.data, 4, testColor);
+shouldBe("getRGBA(imageData.data, 4)", "testColor");
+
+shouldThrow("new ImageData(10)");
+shouldThrow("new ImageData(0, 10)");
+shouldThrow("new ImageData(10, 0)");
+shouldThrow("new ImageData('width', 'height')");
+shouldThrow("new ImageData(1 << 31, 1 << 31)");
+
+shouldThrow("new ImageData(new Uint8ClampedArray(0))");
+shouldThrow("new ImageData(new Uint8Array(100), 25)");
+shouldThrow("new ImageData(new Uint8ClampedArray(27), 2)");
+shouldThrow("new ImageData(new Uint8ClampedArray(104), 14)");
+shouldThrow("new ImageData(imageData.data, 0)");
+shouldThrow("new ImageData(imageData.data, 13)");
+shouldThrow("new ImageData(imageData.data, 1 << 31)");
+shouldThrow("new ImageData(imageData.data, 'biggish')");
+shouldThrow("new ImageData(imageData.data, 1 << 24, 1 << 31)");
+
+imageDataFromData = new ImageData(imageData.data, 100);
+shouldBe("imageDataFromData.width", "100");
+shouldBe("imageDataFromData.height", "50");
+shouldBe("imageDataFromData.data", "imageData.data");
+shouldBe("getRGBA(imageDataFromData.data, 10)", "getRGBA(imageData.data, 10)");
+setRGBA(imageData.data, 10, testColor);
+shouldBe("getRGBA(imageDataFromData.data, 10)", "getRGBA(imageData.data, 10)");
+
+var data = new Uint8ClampedArray(400);
+data[22] = 129;
+imageDataFromData = new ImageData(data, 20, 5);
+shouldBe("imageDataFromData.width", "20");
+shouldBe("imageDataFromData.height", "5");
+shouldBe("imageDataFromData.data", "data");
+shouldBe("getRGBA(imageDataFromData.data, 2)", "getRGBA(data, 2)");
+setRGBA(imageDataFromData.data, 2, testColor);
+shouldBe("getRGBA(imageDataFromData.data, 2)", "getRGBA(data, 2)");