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/** @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 || //(SOF) Huffman - Baseline DCT
imgData.charCodeAt(i+1) === 0xc1 || //(SOF) Huffman - Extended sequential DCT
imgData.charCodeAt(i+1) === 0xc2 || // Progressive DCT (SOF2)
imgData.charCodeAt(i+1) === 0xc3 || // Spatial (sequential) lossless (SOF3)
imgData.charCodeAt(i+1) === 0xc4 || // Differential sequential DCT (SOF5)
imgData.charCodeAt(i+1) === 0xc5 || // Differential progressive DCT (SOF6)
imgData.charCodeAt(i+1) === 0xc6 || // Differential spatial (SOF7)
imgData.charCodeAt(i+1) === 0xc7) {
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)