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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/manual/imagebitmap/createImageBitmap-exif-orientation.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>Test that createImageBitmap honors EXIF orientation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>canvas { outline: 1px solid black; margin-right: 1em; }</style>
<body>
<script>
function loadImage(src) {
return new Promise(function(resolve) {
const image = new Image();
image.addEventListener("load", () => resolve(image), { once: true });
image.src = src;
});
}
function checkColors(ctx, w, h, tileW, tileH, expectedColors) {
let data = ctx.getImageData(0, 0, w, h).data;
for (let [row, col, r, g, b, a] of expectedColors) {
let x = col * tileW + tileW / 2;
let y = row * tileH + tileH / 2;
let i = (x + y * w) * 4;
let expected = [r, g, b, a];
let actual = [data[i], data[i + 1], data[i + 2], data[i + 3]];
assert_array_approx_equals(actual, expected, 1, `Pixel value at (${x},${y}) ${expected} =~ ${actual}.`);
}
}
async_test(function(t) {
const canvas = document.createElement("canvas");
canvas.width = 320;
canvas.height = 160;
document.body.append(canvas);
const ctx = canvas.getContext("2d");
loadImage("resources/squares_6.jpg")
.then((image) => createImageBitmap(image))
.then(t.step_func_done(function(imageBitmap) {
ctx.drawImage(imageBitmap, 0, 0);
checkColors(ctx, canvas.width, canvas.height, 80, 80, [
// row, col, r, g, b, a
[0, 0, 255, 0, 0, 255],
[0, 1, 0, 255, 0, 255],
[0, 2, 0, 0, 255, 255],
[0, 3, 0, 0, 0, 255],
[1, 0, 255, 128, 128, 255],
[1, 1, 128, 255, 128, 255],
[1, 2, 128, 128, 255, 255],
[1, 3, 128, 128, 128, 255],
]);
}));
}, "createImageBitmap with EXIF rotation, imageOrientation from-image, and no cropping");
async_test(function(t) {
const canvas = document.createElement("canvas");
canvas.width = 320;
canvas.height = 160;
document.body.append(canvas);
const ctx = canvas.getContext("2d");
loadImage("resources/squares_6.jpg")
.then((image) => createImageBitmap(image, { imageOrientation: "flipY" }))
.then(t.step_func_done(function(imageBitmap) {
ctx.drawImage(imageBitmap, 0, 0);
checkColors(ctx, canvas.width, canvas.height, 80, 80, [
// row, col, r, g, b, a
[0, 0, 255, 128, 128, 255],
[0, 1, 128, 255, 128, 255],
[0, 2, 128, 128, 255, 255],
[0, 3, 128, 128, 128, 255],
[1, 0, 255, 0, 0, 255],
[1, 1, 0, 255, 0, 255],
[1, 2, 0, 0, 255, 255],
[1, 3, 0, 0, 0, 255],
]);
}));
}, "createImageBitmap with EXIF rotation, imageOrientation flipY, and no cropping");
async_test(function(t) {
const canvas = document.createElement("canvas");
canvas.width = 160;
canvas.height = 160;
document.body.append(canvas);
const ctx = canvas.getContext("2d");
loadImage("resources/squares_6.jpg")
.then(image => createImageBitmap(image, 80, 0, 160, 160))
.then(t.step_func_done(function(imageBitmap) {
ctx.drawImage(imageBitmap, 0, 0);
checkColors(ctx, canvas.width, canvas.height, 80, 80, [
// row, col, r, g, b, a
[0, 0, 0, 255, 0, 255],
[0, 1, 0, 0, 255, 255],
[1, 0, 128, 255, 128, 255],
[1, 1, 128, 128, 255, 255],
]);
}));
}, "createImageBitmap with EXIF rotation, imageOrientation from-image, and cropping");
async_test(function(t) {
const canvas = document.createElement("canvas");
canvas.width = 160;
canvas.height = 160;
document.body.append(canvas);
const ctx = canvas.getContext("2d");
loadImage("resources/squares_6.jpg")
.then(image => createImageBitmap(image, 80, 0, 160, 160, { imageOrientation: "flipY" }))
.then(t.step_func_done(function(imageBitmap) {
ctx.drawImage(imageBitmap, 0, 0);
checkColors(ctx, canvas.width, canvas.height, 80, 80, [
// row, col, r, g, b, a
[0, 0, 128, 255, 128, 255],
[0, 1, 128, 128, 255, 255],
[1, 0, 0, 255, 0, 255],
[1, 1, 0, 0, 255, 255],
]);
}));
}, "createImageBitmap with EXIF rotation, imageOrientation flipY, and cropping");
async_test(function(t) {
const canvas = document.createElement("canvas");
canvas.width = 160;
canvas.height = 80;
document.body.append(canvas);
const ctx = canvas.getContext("2d");
loadImage("resources/squares_6.jpg")
.then((image) => createImageBitmap(image, { resizeWidth:160, resizeHeight:80} ))
.then(t.step_func_done(function(imageBitmap) {
ctx.drawImage(imageBitmap, 0, 0);
checkColors(ctx, canvas.width, canvas.height, 40, 40, [
// row, col, r, g, b, a
[0, 0, 255, 0, 0, 255],
[0, 1, 0, 255, 0, 255],
[0, 2, 0, 0, 255, 255],
[0, 3, 0, 0, 0, 255],
[1, 0, 255, 128, 128, 255],
[1, 1, 128, 255, 128, 255],
[1, 2, 128, 128, 255, 255],
[1, 3, 128, 128, 128, 255],
]);
}));
}, "createImageBitmap with EXIF rotation, imageOrientation from-image, no cropping, and resize");
async_test(function(t) {
const canvas = document.createElement("canvas");
canvas.width = 80;
canvas.height = 80;
document.body.append(canvas);
const ctx = canvas.getContext("2d");
loadImage("resources/squares_6.jpg")
.then(image => createImageBitmap(image, 80, 0, 160, 160, { imageOrientation: "flipY", resizeWidth:80, resizeHeight:80 }))
.then(t.step_func_done(function(imageBitmap) {
ctx.drawImage(imageBitmap, 0, 0);
checkColors(ctx, canvas.width, canvas.height, 40, 40, [
// row, col, r, g, b, a
[0, 0, 128, 255, 128, 255],
[0, 1, 128, 128, 255, 255],
[1, 0, 0, 255, 0, 255],
[1, 1, 0, 0, 255, 255],
]);
}));
}, "createImageBitmap with EXIF rotation, imageOrientation flipY, cropping, and resize");
async_test(function(t) {
const canvas = document.createElement("canvas");
canvas.width = 80;
canvas.height = 40;
document.body.append(canvas);
const ctx = canvas.getContext("2d");
loadImage("resources/squares_6.jpg")
.then(image => createImageBitmap(image, 80, 0, 160, 160, { imageOrientation: "flipY", resizeWidth:80, resizeHeight:40 }))
.then(t.step_func_done(function(imageBitmap) {
ctx.drawImage(imageBitmap, 0, 0);
checkColors(ctx, canvas.width, canvas.height, 40, 20, [
// row, col, r, g, b, a
[0, 0, 128, 255, 128, 255],
[0, 1, 128, 128, 255, 255],
[1, 0, 0, 255, 0, 255],
[1, 1, 0, 0, 255, 255],
]);
}));
}, "createImageBitmap with EXIF rotation, imageOrientation flipY, cropping, and nonuniform resize");
</script>