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description("Ensure correct behavior of canvas with image shadow. A square with a cut-out top-right corner should be displayed with solid shadow (top) and blur shadow (bottom).");
function print(message, color)
{
var paragraph = document.createElement("div");
paragraph.appendChild(document.createTextNode(message));
paragraph.style.fontFamily = "monospace";
if (color)
paragraph.style.color = color;
document.getElementById("console").appendChild(paragraph);
}
function shouldNotBe(a, b)
{
var evalA;
try {
evalA = eval(a);
} catch(e) {
evalA = e;
}
if (evalA != b)
print("PASS " + a + " should not be " + b + " and it's not.", "green")
else
print("FAIL " + a + " should not be " + b + " but it is.", "red");
}
// Create auxiliary canvas to draw to and create an image from.
// This is done instead of simply loading an image from the file system
// because that would throw a SECURITY_ERR DOM Exception.
var aCanvas = document.createElement('canvas');
aCanvas.setAttribute('width', '200');
aCanvas.setAttribute('height', '200');
var aCtx = aCanvas.getContext('2d');
// Draw a circle on the same canvas.
aCtx.beginPath();
aCtx.fillStyle = 'green';
aCtx.arc(100, 100, 150, 0, -Math.PI/2, false);
aCtx.fill();
// Create the image object to be drawn on the master canvas.
var img = new Image();
img.onload = drawImageToCanvasAndCheckPixels;
img.src = aCanvas.toDataURL(); // set a data URI of the base64 enconded image as the source
// Create master canvas.
var canvas = document.createElement('canvas');
document.body.appendChild(canvas);
canvas.setAttribute('width', '600');
canvas.setAttribute('height', '600');
var ctx = canvas.getContext('2d');
function drawImageToCanvasAndCheckPixels() {
ctx.shadowOffsetX = 250;
ctx.shadowColor = 'rgba(240, 50, 50, 1.0)';
ctx.drawImage(img, 50, 50);
ctx.shadowOffsetX = 250;
ctx.shadowBlur = 6;
ctx.shadowColor = 'rgba(50, 50, 200, 0.9)';
ctx.shadowColor = 'rgba(0, 0, 255, 1.0)';
ctx.drawImage(img, 50, 300);
checkPixels();
}
function checkPixels() {
var imageData, data;
// Verify solid shadow.
imageData = ctx.getImageData(260, 300, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '0');
imageData = ctx.getImageData(350, 100, 1, 1);
d = imageData.data;
shouldBe('d[0]', '240');
shouldBe('d[1]', '50');
shouldBe('d[2]', '50');
shouldBe('d[3]', '255');
imageData = ctx.getImageData(400, 200, 1, 1);
d = imageData.data;
shouldBe('d[0]', '240');
shouldBe('d[1]', '50');
shouldBe('d[2]', '50');
shouldBe('d[3]', '255');
imageData = ctx.getImageData(490, 65, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '0');
imageData = ctx.getImageData(485, 65, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '0');
// Verify blurry shadow.
imageData = ctx.getImageData(260, 400, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '0');
imageData = ctx.getImageData(350, 300, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '255');
shouldNotBe('d[3]', '255');
imageData = ctx.getImageData(300, 400, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '255');
shouldNotBe('d[3]', '255');
imageData = ctx.getImageData(300, 500, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '255');
shouldNotBe('d[3]', '255');
imageData = ctx.getImageData(400, 500, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '255');
shouldNotBe('d[3]', '255');
imageData = ctx.getImageData(400, 400, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '255');
imageData = ctx.getImageData(490, 315, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '0');
imageData = ctx.getImageData(485, 320, 1, 1);
d = imageData.data;
shouldBe('d[0]', '0');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '0');
finishJSTest();
}
window.jsTestIsAsync = true;
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