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function createImageWithMetadata({
width,
height,
preferredWidth,
preferredHeight,
resolutionX,
resolutionY,
resolutionUnit,
orientation
}) {
const canvas = document.createElement('canvas')
canvas.width = width || 100
canvas.height = height || 100
const ctx = canvas.getContext('2d')
ctx.fillColor = 'green'
ctx.fillRect(0, 0, canvas.width, canvas.height)
const original = canvas.toDataURL('image/jpeg')
const root = {}
const exif = {}
if (orientation !== undefined)
root[piexif.ExifIFD.Orientation] = orientation
if (resolutionX !== undefined)
root[piexif.ImageIFD.XResolution] = Array.isArray(resolutionX) ? resolutionX : [resolutionX, 1]
if (resolutionY !== undefined)
root[piexif.ImageIFD.YResolution] = Array.isArray(resolutionY) ? resolutionY : [resolutionY, 1]
if (resolutionUnit !== undefined)
root[piexif.ImageIFD.ResolutionUnit] = resolutionUnit
if (preferredWidth !== undefined)
exif[piexif.ExifIFD.PixelXDimension] = preferredWidth
if (preferredHeight !== undefined)
exif[piexif.ExifIFD.PixelYDimension] = preferredHeight
const exifString = piexif.dump({'0th': root, 'Exif': exif})
const newDataUrl = piexif.insert(exifString, original)
const image = new Image()
image.src = newDataUrl
return new Promise(resolve => {
image.onload = () => resolve(image);
})
}
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