Created
November 5, 2023 06:57
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Tauri read pdf and extract images
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readBinaryFile(event.payload[0]).then(async (data) => { | |
pdfjsLib.getDocument(data.buffer).promise.then((pdf) => { | |
pdf.getPage(1).then((page) => { | |
page.getOperatorList().then((ops) => { | |
const fns = ops.fnArray; | |
const args = ops.argsArray; | |
const validObjectTypes = [ | |
pdfjsLib.OPS.paintImageXObject, // 85 | |
pdfjsLib.OPS.paintImageXObjectRepeat, // 88, | |
]; | |
args.forEach((arg, i) => { | |
if (!validObjectTypes.includes(fns[i])) { | |
return; | |
} | |
page.objs.get(arg[0], async (image: any) => { | |
const imageUnit8Array = image.data; | |
const imageWidth = image.width; | |
const imageHeight = image.height; | |
const imageUint8ArrayWithAlphaChanel = addAlphaChannelToUnit8ClampedArray(imageUnit8Array, imageWidth, imageHeight); | |
const imageData = new ImageData(imageUint8ArrayWithAlphaChanel, imageWidth, imageHeight); | |
const canvas = document.createElement('canvas'); | |
const ctx = canvas.getContext('2d'); | |
canvas.width = imageWidth; | |
canvas.height = imageHeight; | |
if (ctx) { | |
ctx.putImageData(imageData, 0, 0); | |
const data = ctx.canvas.toDataURL(); | |
setImgList((imgList) => [...imgList, data]); | |
} | |
}); | |
}); | |
}); | |
// | |
// const scale = 1; | |
// const viewport = page.getViewport({ scale }); | |
// | |
// page.getOperatorList().then((opList) => { | |
// const svgGfx = new pdfjsLib.SVGGraphics(page.commonObjs, page.objs); | |
// | |
// svgGfx.getSVG(opList, viewport).then((svg) => { | |
// // @ts-ignore | |
// document.body.appendChild(svg); | |
// }); | |
// }); | |
}); | |
}); | |
}); |
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