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language: node_js | ||
node_js: | ||
- node | ||
- "10" | ||
cache: | ||
directories: | ||
- node_modules | ||
|
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<!DOCTYPE html> | ||
<!-- | ||
Copyright 2018 Mozilla Foundation | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
--> | ||
<html dir="ltr" mozdisallowselectionprint> | ||
<head> | ||
<meta charset="utf-8"> | ||
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> | ||
<meta name="google" content="notranslate"> | ||
<title>PDF.js standalone JpegImage parser</title> | ||
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<style> | ||
body { | ||
background-color: #808080; | ||
margin: 0; | ||
padding: 0; | ||
} | ||
</style> | ||
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<script src="../../node_modules/pdfjs-dist/image_decoders/pdf.image_decoders.js"></script> | ||
</head> | ||
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<body tabindex="1"> | ||
<canvas id="jpegCanvas" width="0" height="0"></canvas> | ||
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<script src="jpeg_viewer.js"></script> | ||
</body> | ||
</html> |
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/* Copyright 2018 Mozilla Foundation | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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'use strict'; | ||
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if (!pdfjsImageDecoders.JpegImage) { | ||
alert('Please build the pdfjs-dist library using `gulp dist-install`'); | ||
} | ||
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var JPEG_IMAGE = 'fish.jpg'; | ||
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var jpegCanvas = document.getElementById('jpegCanvas'); | ||
var jpegCtx = jpegCanvas.getContext('2d'); | ||
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// Load the image data, and convert it to a Uint8Array. | ||
// | ||
var nonBinaryRequest = false; | ||
var request = new XMLHttpRequest(); | ||
request.open('GET', JPEG_IMAGE, false); | ||
try { | ||
request.responseType = 'arraybuffer'; | ||
nonBinaryRequest = request.responseType !== 'arraybuffer'; | ||
} catch (e) { | ||
nonBinaryRequest = true; | ||
} | ||
if (nonBinaryRequest && request.overrideMimeType) { | ||
request.overrideMimeType('text/plain; charset=x-user-defined'); | ||
} | ||
request.send(null); | ||
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var typedArrayImage; | ||
if (nonBinaryRequest) { | ||
var str = request.responseText, length = str.length; | ||
var bytes = new Uint8Array(length); | ||
for (var i = 0; i < length; ++i) { | ||
bytes[i] = str.charCodeAt(i) & 0xFF; | ||
} | ||
typedArrayImage = bytes; | ||
} else { | ||
typedArrayImage = new Uint8Array(request.response); | ||
} | ||
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// Parse the image data using `JpegImage`. | ||
// | ||
var jpegImage = new pdfjsImageDecoders.JpegImage(); | ||
jpegImage.parse(typedArrayImage); | ||
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var width = jpegImage.width, height = jpegImage.height; | ||
var jpegData = jpegImage.getData({ | ||
width, | ||
height, | ||
forceRGB: true, | ||
}); | ||
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// Render the JPEG image on a <canvas>. | ||
// | ||
var imageData = jpegCtx.createImageData(width, height); | ||
var imageBytes = imageData.data; | ||
for (var i = 0, j = 0, ii = width * height * 4; i < ii;) { | ||
imageBytes[i++] = jpegData[j++]; | ||
imageBytes[i++] = jpegData[j++]; | ||
imageBytes[i++] = jpegData[j++]; | ||
imageBytes[i++] = 255; | ||
} | ||
jpegCanvas.width = width, jpegCanvas.height = height; | ||
jpegCtx.putImageData(imageData, 0, 0); | ||
|
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