blob: 4354b9ac4188cd904f7e941001e724f78b0bde54 [file] [log] [blame]
<!DOCTYPE html>
<meta charset="utf-8">
<title>Canvas's ImageBitmapRenderingContext test</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context">
<script>
var width = 10;
var height = 10;
function testCanvas(ctx, r, g, b, a)
{
var color = ctx.getImageData(5, 5, 1, 1).data;
assert_array_equals(color, [r, g, b, a]);
}
function consumeImageBitmap(image, alphaVal, expectedR, expectedG, expectedB, expectedA)
{
var dstCanvas = document.createElement('canvas');
dstCanvas.width = width;
dstCanvas.height = height;
var dstCtx;
if (alphaVal == 'true')
dstCtx = dstCanvas.getContext('bitmaprenderer', { alpha: true });
else if (alphaVal == 'false')
dstCtx = dstCanvas.getContext('bitmaprenderer', { alpha: false });
else
dstCtx = dstCanvas.getContext('bitmaprenderer');
dstCtx.transferFromImageBitmap(image);
var myCanvas = document.createElement('canvas');
myCanvas.width = width;
myCanvas.height = height;
var myCtx = myCanvas.getContext('2d');
myCtx.drawImage(dstCanvas, 0, 0);
testCanvas(myCtx, expectedR, expectedG, expectedB, expectedA);
}
promise_test(function() {
var srcCanvas = document.createElement('canvas');
srcCanvas.width = width;
srcCanvas.height = height;
var ctx = srcCanvas.getContext('2d');
ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, width, height);
return createImageBitmap(srcCanvas).then(function(image) {
consumeImageBitmap(image, 'false', 0, 127, 0, 255);
});
}, "Test that an ImageBitmapRenderingContext with alpha disabled makes the canvas opaque");
promise_test(function() {
var srcCanvas = document.createElement('canvas');
srcCanvas.width = width;
srcCanvas.height = height;
var ctx = srcCanvas.getContext('2d');
ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, width, height);
return createImageBitmap(srcCanvas).then(function(image) {
consumeImageBitmap(image, 'true', 0, 255, 0, 127);
});
}, "Test that an ImageBitmapRenderingContext with alpha enabled preserves the alpha");
promise_test(function() {
var srcCanvas = document.createElement('canvas');
srcCanvas.width = width;
srcCanvas.height = height;
var ctx = srcCanvas.getContext('2d');
ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, width, height);
return createImageBitmap(srcCanvas).then(function(image) {
consumeImageBitmap(image, '', 0, 255, 0, 127);
});
}, "Test that the 'alpha' context creation attribute is true by default");
</script>