Subversion-Projekte lars-tiefland.cienc

/** @preserve

jsPDF addImage plugin (JPEG only at this time)

Copyright (c) 2012 https://github.com/siefkenj/

*/

/**

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 * ====================================================================

 */

;(function(jsPDFAPI) {

'use strict'

var namespace = 'addImage_'

// takes a string imgData containing the raw bytes of

// a jpeg image and returns [width, height]

// Algorithm from: http://www.64lines.com/jpeg-width-height

var getJpegSize = function(imgData) {

	'use strict'

	var width, height;

	// Verify we have a valid jpeg header 0xff,0xd8,0xff,0xe0,?,?,'J','F','I','F',0x00

	if (!imgData.charCodeAt(0) === 0xff ||

		!imgData.charCodeAt(1) === 0xd8 ||

		!imgData.charCodeAt(2) === 0xff ||

		!imgData.charCodeAt(3) === 0xe0 ||

		!imgData.charCodeAt(6) === 'J'.charCodeAt(0) ||

		!imgData.charCodeAt(7) === 'F'.charCodeAt(0) ||

		!imgData.charCodeAt(8) === 'I'.charCodeAt(0) ||

		!imgData.charCodeAt(9) === 'F'.charCodeAt(0) ||

		!imgData.charCodeAt(10) === 0x00) {

			throw new Error('getJpegSize requires a binary jpeg file')

	}

	var blockLength = imgData.charCodeAt(4)*256 + imgData.charCodeAt(5);

	var i = 4, len = imgData.length;

	while ( i < len ) {

		i += blockLength;

		if (imgData.charCodeAt(i) !== 0xff) {

			throw new Error('getJpegSize could not find the size of the image');

		}

		if (imgData.charCodeAt(i+1) === 0xc0) {

			height = imgData.charCodeAt(i+5)*256 + imgData.charCodeAt(i+6);

			width = imgData.charCodeAt(i+7)*256 + imgData.charCodeAt(i+8);

			return [width, height];

		} else {

			i += 2;

			blockLength = imgData.charCodeAt(i)*256 + imgData.charCodeAt(i+1)

		}

	}

}

// Image functionality ported from pdf.js

, putImage = function(img) {

	var objectNumber = this.internal.newObject()

	, out = this.internal.write

	, putStream = this.internal.putStream

	img['n'] = objectNumber

	out('<</Type /XObject')

	out('/Subtype /Image')

	out('/Width ' + img['w'])

	out('/Height ' + img['h'])

	if (img['cs'] === 'Indexed') {

		out('/ColorSpace [/Indexed /DeviceRGB '

				+ (img['pal'].length / 3 - 1) + ' ' + (objectNumber + 1)

				+ ' 0 R]');

	} else {

		out('/ColorSpace /' + img['cs']);

		if (img['cs'] === 'DeviceCMYK') {

			out('/Decode [1 0 1 0 1 0 1 0]');

		}

	}

	out('/BitsPerComponent ' + img['bpc']);

	if ('f' in img) {

		out('/Filter /' + img['f']);

	}

	if ('dp' in img) {

		out('/DecodeParms <<' + img['dp'] + '>>');

	}

	if ('trns' in img && img['trns'].constructor == Array) {

		var trns = '';

		for ( var i = 0; i < img['trns'].length; i++) {

			trns += (img[trns][i] + ' ' + img['trns'][i] + ' ');

			out('/Mask [' + trns + ']');

		}

	}

	if ('smask' in img) {

		out('/SMask ' + (objectNumber + 1) + ' 0 R');

	}

	out('/Length ' + img['data'].length + '>>');

	putStream(img['data']);

	out('endobj');

}

, putResourcesCallback = function() {

	var images = this.internal.collections[namespace + 'images']

	for ( var i in images ) {

		putImage.call(this, images[i])

	}

}

, putXObjectsDictCallback = function(){

	var images = this.internal.collections[namespace + 'images']

	, out = this.internal.write

	, image

	for (var i in images) {

		image = images[i]

		out(

			'/I' + image['i']

			, image['n']

			, '0'

			, 'R'

		)

	}

}

jsPDFAPI.addImage = function(imageData, format, x, y, w, h) {

	'use strict'

	if (typeof imageData === 'object' && imageData.nodeType === 1) {

        var canvas = document.createElement('canvas');

        canvas.width = imageData.clientWidth;

	    canvas.height = imageData.clientHeight;

        var ctx = canvas.getContext('2d');

        if (!ctx) {

            throw ('addImage requires canvas to be supported by browser.');

        }

        ctx.drawImage(imageData, 0, 0, canvas.width, canvas.height);

        imageData = canvas.toDataURL('image/jpeg');

	    format = "JPEG";

	}

	if (format.toUpperCase() !== 'JPEG') {

		throw new Error('addImage currently only supports format \'JPEG\', not \''+format+'\'');

	}

	var imageIndex

	, images = this.internal.collections[namespace + 'images']

	, coord = this.internal.getCoordinateString

	, vcoord = this.internal.getVerticalCoordinateString;

	// Detect if the imageData is raw binary or Data URL

	if (imageData.substring(0, 23) === 'data:image/jpeg;base64,') {

		imageData = atob(imageData.replace('data:image/jpeg;base64,', ''));

	}

	if (images){

		// this is NOT the first time this method is ran on this instance of jsPDF object.

		imageIndex = Object.keys ?

		Object.keys(images).length :

		(function(o){

			var i = 0

			for (var e in o){if(o.hasOwnProperty(e)){ i++ }}

			return i

		})(images)

	} else {

		// this is the first time this method is ran on this instance of jsPDF object.

		imageIndex = 0

		this.internal.collections[namespace + 'images'] = images = {}

		this.internal.events.subscribe('putResources', putResourcesCallback)

		this.internal.events.subscribe('putXobjectDict', putXObjectsDictCallback)

	}

	var dims = getJpegSize(imageData);

	var info = {

		w : dims[0],

		h : dims[1],

		cs : 'DeviceRGB',

		bpc : 8,

		f : 'DCTDecode',

		i : imageIndex,

		data : imageData

		// n: objectNumber will be added by putImage code

	};

	images[imageIndex] = info

	if (!w && !h) {

		w = -96;

		h = -96;

	}

	if (w < 0) {

		w = (-1) * info['w'] * 72 / w / this.internal.scaleFactor;

	}

	if (h < 0) {

		h = (-1) * info['h'] * 72 / h / this.internal.scaleFactor;

	}

	if (w === 0) {

		w = h * info['w'] / info['h'];

	}

	if (h === 0) {

		h = w * info['h'] / info['w'];

	}

	this.internal.write(

		'q'

		, coord(w)

		, '0 0'

		, coord(h) // TODO: check if this should be shifted by vcoord

		, coord(x)

		, vcoord(y + h)

		, 'cm /I'+info['i']

		, 'Do Q'

	)

	return this

}

})(jsPDF.API)