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Code Activity

BUGFIX use correct image-orientation

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This commit is contained in:
thomasrosen 2021-01-22 08:40:31 +01:00
parent f1cccb6879
commit 14757887e0
1 changed files with 94 additions and 10 deletions
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102
src/App.js
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@ -8,6 +8,44 @@ import mergeImages from 'merge-images'
const frameSize = 1080
function getOrientation(file, callback) {
// Source: http://stackoverflow.com/a/32490603
var reader = new FileReader();
reader.onload = function (event) {
var view = new DataView(event.target.result);
if (view.getUint16(0, false) !== 0xFFD8) return callback(-2);
var length = view.byteLength,
offset = 2;
while (offset < length) {
var marker = view.getUint16(offset, false);
offset += 2;
if (marker === 0xFFE1) {
if (view.getUint32(offset += 2, false) !== 0x45786966) {
return callback(-1);
}
var little = view.getUint16(offset += 6, false) === 0x4949;
offset += view.getUint32(offset + 4, little);
var tags = view.getUint16(offset, little);
offset += 2;
for (var i = 0; i < tags; i++)
if (view.getUint16(offset + (i * 12), little) === 0x0112)
return callback(view.getUint16(offset + (i * 12) + 8, little));
}
else if ((marker & 0xFF00) !== 0xFF00) break;
else offset += view.getUint16(offset, false);
}
return callback(-1);
};
reader.readAsArrayBuffer(file.slice(0, 64 * 1024));
};
function App() {
const [frameURL, setFrameURL] = useState(null)
const [originalPhoto, setOriginalPhoto] = useState(null)
@ -43,16 +81,62 @@ function App() {
width = (img.width / img.height) * frameSize
}
ctx.drawImage(
img,
(frameSize - width) / 2,
(frameSize - height) / 2,
width,
height,
)
getOrientation(file, orientation => {
// use the correct image orientation
switch (orientation) {
// Source: https://stackoverflow.com/a/30242954/2387277
// Source: https://stackoverflow.com/questions/19463126/how-to-draw-photo-with-correct-orientation-in-canvas-after-capture-photo-by-usin
case 2:
// horizontal flip
ctx.translate(canvas.width, 0)
ctx.scale(-1, 1)
break
case 3:
// 180° rotate left
ctx.translate(canvas.width, canvas.height)
ctx.rotate(Math.PI)
break
case 4:
// vertical flip
ctx.translate(0, canvas.height)
ctx.scale(1, -1)
break
case 5:
// vertical flip + 90 rotate right
ctx.rotate(0.5 * Math.PI)
ctx.scale(1, -1)
break
case 6:
// 90° rotate right
ctx.rotate(0.5 * Math.PI)
ctx.translate(0, -canvas.height)
break
case 7:
// horizontal flip + 90 rotate right
ctx.rotate(0.5 * Math.PI)
ctx.translate(canvas.width, -canvas.height)
ctx.scale(-1, 1)
break
case 8:
// 90° rotate left
ctx.rotate(-0.5 * Math.PI)
ctx.translate(-canvas.width, 0)
break
default:
break
}
const pngUrl = canvas.toDataURL()
setPhoto(pngUrl)
ctx.drawImage(
img,
(frameSize - width) / 2,
(frameSize - height) / 2,
width,
height,
)
const pngUrl = canvas.toDataURL()
setPhoto(pngUrl)
})
}
img.src = reader_event.target.result
setOriginalPhoto(reader_event.target.result)