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-/**
- * @license
- Copyright (c) 2008, Adobe Systems Incorporated
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
-
- * Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
-
- * Neither the name of Adobe Systems Incorporated nor the names of its
- contributors may be used to endorse or promote products derived from
- this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-/**
- * @license
-JPEG encoder ported to JavaScript and optimized by Andreas Ritter, www.bytestrom.eu, 11/2009
-
-Basic GUI blocking jpeg encoder
-
-v 0.9
-*/
-
-/**
- * @fileoverview This code was ported from
- * http://www.bytestrom.eu/blog/2009/1120a_jpeg_encoder_for_javascript and
- * modified slightly for Closure.
- */
-
-goog.provide('goog.crypt.JpegEncoder');
-
-goog.require('goog.crypt.base64');
-
-/**
- * Initializes the JpegEncoder.
- *
- * @constructor
- * @param {number=} opt_quality The compression quality. Default 50.
- */
-goog.crypt.JpegEncoder = function(opt_quality) {
- var self = this;
- var fround = Math.round;
- var ffloor = Math.floor;
- var YTable = new Array(64);
- var UVTable = new Array(64);
- var fdtbl_Y = new Array(64);
- var fdtbl_UV = new Array(64);
- var YDC_HT;
- var UVDC_HT;
- var YAC_HT;
- var UVAC_HT;
-
- var bitcode = new Array(65535);
- var category = new Array(65535);
- var outputfDCTQuant = new Array(64);
- var DU = new Array(64);
- var byteout = [];
- var bytenew = 0;
- var bytepos = 7;
-
- var YDU = new Array(64);
- var UDU = new Array(64);
- var VDU = new Array(64);
- var clt = new Array(256);
- var RGB_YUV_TABLE = new Array(2048);
- var currentQuality;
-
- var ZigZag = [
- 0, 1, 5, 6,14,15,27,28,
- 2, 4, 7,13,16,26,29,42,
- 3, 8,12,17,25,30,41,43,
- 9,11,18,24,31,40,44,53,
- 10,19,23,32,39,45,52,54,
- 20,22,33,38,46,51,55,60,
- 21,34,37,47,50,56,59,61,
- 35,36,48,49,57,58,62,63
- ];
-
- var std_dc_luminance_nrcodes = [0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0];
- var std_dc_luminance_values = [0,1,2,3,4,5,6,7,8,9,10,11];
- var std_ac_luminance_nrcodes = [0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d];
- var std_ac_luminance_values = [
- 0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,
- 0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,
- 0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08,
- 0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,
- 0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,
- 0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28,
- 0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,
- 0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,
- 0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59,
- 0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,
- 0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,
- 0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89,
- 0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,
- 0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,
- 0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6,
- 0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,
- 0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,
- 0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2,
- 0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,
- 0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,
- 0xf9,0xfa
- ];
-
- var std_dc_chrominance_nrcodes = [0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0];
- var std_dc_chrominance_values = [0,1,2,3,4,5,6,7,8,9,10,11];
- var std_ac_chrominance_nrcodes = [0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77];
- var std_ac_chrominance_values = [
- 0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,
- 0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,
- 0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91,
- 0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,
- 0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,
- 0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26,
- 0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,
- 0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,
- 0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,
- 0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,
- 0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,
- 0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87,
- 0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,
- 0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,
- 0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,
- 0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,
- 0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,
- 0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,
- 0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,
- 0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,
- 0xf9,0xfa
- ];
-
- function initQuantTables(sf){
- var YQT = [
- 16, 11, 10, 16, 24, 40, 51, 61,
- 12, 12, 14, 19, 26, 58, 60, 55,
- 14, 13, 16, 24, 40, 57, 69, 56,
- 14, 17, 22, 29, 51, 87, 80, 62,
- 18, 22, 37, 56, 68,109,103, 77,
- 24, 35, 55, 64, 81,104,113, 92,
- 49, 64, 78, 87,103,121,120,101,
- 72, 92, 95, 98,112,100,103, 99
- ];
-
- for (var i = 0; i < 64; i++) {
- var t = ffloor((YQT[i]*sf+50)/100);
- if (t < 1) {
- t = 1;
- } else if (t > 255) {
- t = 255;
- }
- YTable[ZigZag[i]] = t;
- }
- var UVQT = [
- 17, 18, 24, 47, 99, 99, 99, 99,
- 18, 21, 26, 66, 99, 99, 99, 99,
- 24, 26, 56, 99, 99, 99, 99, 99,
- 47, 66, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99
- ];
- for (var j = 0; j < 64; j++) {
- var u = ffloor((UVQT[j]*sf+50)/100);
- if (u < 1) {
- u = 1;
- } else if (u > 255) {
- u = 255;
- }
- UVTable[ZigZag[j]] = u;
- }
- var aasf = [
- 1.0, 1.387039845, 1.306562965, 1.175875602,
- 1.0, 0.785694958, 0.541196100, 0.275899379
- ];
- var k = 0;
- for (var row = 0; row < 8; row++)
- {
- for (var col = 0; col < 8; col++)
- {
- fdtbl_Y[k] = (1.0 / (YTable [ZigZag[k]] * aasf[row] * aasf[col] * 8.0));
- fdtbl_UV[k] = (1.0 / (UVTable[ZigZag[k]] * aasf[row] * aasf[col] * 8.0));
- k++;
- }
- }
- }
-
- function computeHuffmanTbl(nrcodes, std_table){
- var codevalue = 0;
- var pos_in_table = 0;
- var HT = new Array();
- for (var k = 1; k <= 16; k++) {
- for (var j = 1; j <= nrcodes[k]; j++) {
- HT[std_table[pos_in_table]] = [];
- HT[std_table[pos_in_table]][0] = codevalue;
- HT[std_table[pos_in_table]][1] = k;
- pos_in_table++;
- codevalue++;
- }
- codevalue*=2;
- }
- return HT;
- }
-
- function initHuffmanTbl()
- {
- YDC_HT = computeHuffmanTbl(std_dc_luminance_nrcodes,std_dc_luminance_values);
- UVDC_HT = computeHuffmanTbl(std_dc_chrominance_nrcodes,std_dc_chrominance_values);
- YAC_HT = computeHuffmanTbl(std_ac_luminance_nrcodes,std_ac_luminance_values);
- UVAC_HT = computeHuffmanTbl(std_ac_chrominance_nrcodes,std_ac_chrominance_values);
- }
-
- function initCategoryNumber()
- {
- var nrlower = 1;
- var nrupper = 2;
- for (var cat = 1; cat <= 15; cat++) {
- //Positive numbers
- for (var nr = nrlower; nr<nrupper; nr++) {
- category[32767+nr] = cat;
- bitcode[32767+nr] = [];
- bitcode[32767+nr][1] = cat;
- bitcode[32767+nr][0] = nr;
- }
- //Negative numbers
- for (var nrneg =-(nrupper-1); nrneg<=-nrlower; nrneg++) {
- category[32767+nrneg] = cat;
- bitcode[32767+nrneg] = [];
- bitcode[32767+nrneg][1] = cat;
- bitcode[32767+nrneg][0] = nrupper-1+nrneg;
- }
- nrlower <<= 1;
- nrupper <<= 1;
- }
- }
-
- function initRGBYUVTable() {
- for(var i = 0; i < 256;i++) {
- RGB_YUV_TABLE[i] = 19595 * i;
- RGB_YUV_TABLE[(i+ 256)>>0] = 38470 * i;
- RGB_YUV_TABLE[(i+ 512)>>0] = 7471 * i + 0x8000;
- RGB_YUV_TABLE[(i+ 768)>>0] = -11059 * i;
- RGB_YUV_TABLE[(i+1024)>>0] = -21709 * i;
- RGB_YUV_TABLE[(i+1280)>>0] = 32768 * i + 0x807FFF;
- RGB_YUV_TABLE[(i+1536)>>0] = -27439 * i;
- RGB_YUV_TABLE[(i+1792)>>0] = - 5329 * i;
- }
- }
-
- // IO functions
- function writeBits(bs)
- {
- var value = bs[0];
- var posval = bs[1]-1;
- while ( posval >= 0 ) {
- if (value & (1 << posval) ) {
- bytenew |= (1 << bytepos);
- }
- posval--;
- bytepos--;
- if (bytepos < 0) {
- if (bytenew == 0xFF) {
- writeByte(0xFF);
- writeByte(0);
- }
- else {
- writeByte(bytenew);
- }
- bytepos=7;
- bytenew=0;
- }
- }
- }
-
- function writeByte(value)
- {
- byteout.push(clt[value]); // write char directly instead of converting later
- }
-
- function writeWord(value)
- {
- writeByte((value>>8)&0xFF);
- writeByte((value )&0xFF);
- }
-
- // DCT & quantization core
- function fDCTQuant(data, fdtbl)
- {
- var d0, d1, d2, d3, d4, d5, d6, d7;
- /* Pass 1: process rows. */
- var dataOff=0;
- var i;
- var I8 = 8;
- var I64 = 64;
- for (i=0; i<I8; ++i)
- {
- d0 = data[dataOff];
- d1 = data[dataOff+1];
- d2 = data[dataOff+2];
- d3 = data[dataOff+3];
- d4 = data[dataOff+4];
- d5 = data[dataOff+5];
- d6 = data[dataOff+6];
- d7 = data[dataOff+7];
-
- var tmp0 = d0 + d7;
- var tmp7 = d0 - d7;
- var tmp1 = d1 + d6;
- var tmp6 = d1 - d6;
- var tmp2 = d2 + d5;
- var tmp5 = d2 - d5;
- var tmp3 = d3 + d4;
- var tmp4 = d3 - d4;
-
- /* Even part */
- var tmp10 = tmp0 + tmp3; /* phase 2 */
- var tmp13 = tmp0 - tmp3;
- var tmp11 = tmp1 + tmp2;
- var tmp12 = tmp1 - tmp2;
-
- data[dataOff] = tmp10 + tmp11; /* phase 3 */
- data[dataOff+4] = tmp10 - tmp11;
-
- var z1 = (tmp12 + tmp13) * 0.707106781; /* c4 */
- data[dataOff+2] = tmp13 + z1; /* phase 5 */
- data[dataOff+6] = tmp13 - z1;
-
- /* Odd part */
- tmp10 = tmp4 + tmp5; /* phase 2 */
- tmp11 = tmp5 + tmp6;
- tmp12 = tmp6 + tmp7;
-
- /* The rotator is modified from fig 4-8 to avoid extra negations. */
- var z5 = (tmp10 - tmp12) * 0.382683433; /* c6 */
- var z2 = 0.541196100 * tmp10 + z5; /* c2-c6 */
- var z4 = 1.306562965 * tmp12 + z5; /* c2+c6 */
- var z3 = tmp11 * 0.707106781; /* c4 */
-
- var z11 = tmp7 + z3; /* phase 5 */
- var z13 = tmp7 - z3;
-
- data[dataOff+5] = z13 + z2; /* phase 6 */
- data[dataOff+3] = z13 - z2;
- data[dataOff+1] = z11 + z4;
- data[dataOff+7] = z11 - z4;
-
- dataOff += 8; /* advance pointer to next row */
- }
-
- /* Pass 2: process columns. */
- dataOff = 0;
- for (i=0; i<I8; ++i)
- {
- d0 = data[dataOff];
- d1 = data[dataOff + 8];
- d2 = data[dataOff + 16];
- d3 = data[dataOff + 24];
- d4 = data[dataOff + 32];
- d5 = data[dataOff + 40];
- d6 = data[dataOff + 48];
- d7 = data[dataOff + 56];
-
- var tmp0p2 = d0 + d7;
- var tmp7p2 = d0 - d7;
- var tmp1p2 = d1 + d6;
- var tmp6p2 = d1 - d6;
- var tmp2p2 = d2 + d5;
- var tmp5p2 = d2 - d5;
- var tmp3p2 = d3 + d4;
- var tmp4p2 = d3 - d4;
-
- /* Even part */
- var tmp10p2 = tmp0p2 + tmp3p2; /* phase 2 */
- var tmp13p2 = tmp0p2 - tmp3p2;
- var tmp11p2 = tmp1p2 + tmp2p2;
- var tmp12p2 = tmp1p2 - tmp2p2;
-
- data[dataOff] = tmp10p2 + tmp11p2; /* phase 3 */
- data[dataOff+32] = tmp10p2 - tmp11p2;
-
- var z1p2 = (tmp12p2 + tmp13p2) * 0.707106781; /* c4 */
- data[dataOff+16] = tmp13p2 + z1p2; /* phase 5 */
- data[dataOff+48] = tmp13p2 - z1p2;
-
- /* Odd part */
- tmp10p2 = tmp4p2 + tmp5p2; /* phase 2 */
- tmp11p2 = tmp5p2 + tmp6p2;
- tmp12p2 = tmp6p2 + tmp7p2;
-
- /* The rotator is modified from fig 4-8 to avoid extra negations. */
- var z5p2 = (tmp10p2 - tmp12p2) * 0.382683433; /* c6 */
- var z2p2 = 0.541196100 * tmp10p2 + z5p2; /* c2-c6 */
- var z4p2 = 1.306562965 * tmp12p2 + z5p2; /* c2+c6 */
- var z3p2 = tmp11p2 * 0.707106781; /* c4 */
-
- var z11p2 = tmp7p2 + z3p2; /* phase 5 */
- var z13p2 = tmp7p2 - z3p2;
-
- data[dataOff+40] = z13p2 + z2p2; /* phase 6 */
- data[dataOff+24] = z13p2 - z2p2;
- data[dataOff+ 8] = z11p2 + z4p2;
- data[dataOff+56] = z11p2 - z4p2;
-
- dataOff++; /* advance pointer to next column */
- }
-
- // Quantize/descale the coefficients
- var fDCTQuant;
- for (i=0; i<I64; ++i)
- {
- // Apply the quantization and scaling factor & Round to nearest integer
- fDCTQuant = data[i]*fdtbl[i];
- outputfDCTQuant[i] = (fDCTQuant > 0.0) ? ((fDCTQuant + 0.5)|0) : ((fDCTQuant - 0.5)|0);
- //outputfDCTQuant[i] = fround(fDCTQuant);
-
- }
- return outputfDCTQuant;
- }
-
- function writeAPP0()
- {
- writeWord(0xFFE0); // marker
- writeWord(16); // length
- writeByte(0x4A); // J
- writeByte(0x46); // F
- writeByte(0x49); // I
- writeByte(0x46); // F
- writeByte(0); // = "JFIF",'\0'
- writeByte(1); // versionhi
- writeByte(1); // versionlo
- writeByte(0); // xyunits
- writeWord(1); // xdensity
- writeWord(1); // ydensity
- writeByte(0); // thumbnwidth
- writeByte(0); // thumbnheight
- }
-
- function writeSOF0(width, height)
- {
- writeWord(0xFFC0); // marker
- writeWord(17); // length, truecolor YUV JPG
- writeByte(8); // precision
- writeWord(height);
- writeWord(width);
- writeByte(3); // nrofcomponents
- writeByte(1); // IdY
- writeByte(0x11); // HVY
- writeByte(0); // QTY
- writeByte(2); // IdU
- writeByte(0x11); // HVU
- writeByte(1); // QTU
- writeByte(3); // IdV
- writeByte(0x11); // HVV
- writeByte(1); // QTV
- }
-
- function writeDQT()
- {
- writeWord(0xFFDB); // marker
- writeWord(132); // length
- writeByte(0);
- for (var i=0; i<64; i++) {
- writeByte(YTable[i]);
- }
- writeByte(1);
- for (var j=0; j<64; j++) {
- writeByte(UVTable[j]);
- }
- }
-
- function writeDHT()
- {
- writeWord(0xFFC4); // marker
- writeWord(0x01A2); // length
-
- writeByte(0); // HTYDCinfo
- for (var i=0; i<16; i++) {
- writeByte(std_dc_luminance_nrcodes[i+1]);
- }
- for (var j=0; j<=11; j++) {
- writeByte(std_dc_luminance_values[j]);
- }
-
- writeByte(0x10); // HTYACinfo
- for (var k=0; k<16; k++) {
- writeByte(std_ac_luminance_nrcodes[k+1]);
- }
- for (var l=0; l<=161; l++) {
- writeByte(std_ac_luminance_values[l]);
- }
-
- writeByte(1); // HTUDCinfo
- for (var m=0; m<16; m++) {
- writeByte(std_dc_chrominance_nrcodes[m+1]);
- }
- for (var n=0; n<=11; n++) {
- writeByte(std_dc_chrominance_values[n]);
- }
-
- writeByte(0x11); // HTUACinfo
- for (var o=0; o<16; o++) {
- writeByte(std_ac_chrominance_nrcodes[o+1]);
- }
- for (var p=0; p<=161; p++) {
- writeByte(std_ac_chrominance_values[p]);
- }
- }
-
- function writeSOS()
- {
- writeWord(0xFFDA); // marker
- writeWord(12); // length
- writeByte(3); // nrofcomponents
- writeByte(1); // IdY
- writeByte(0); // HTY
- writeByte(2); // IdU
- writeByte(0x11); // HTU
- writeByte(3); // IdV
- writeByte(0x11); // HTV
- writeByte(0); // Ss
- writeByte(0x3f); // Se
- writeByte(0); // Bf
- }
-
- function processDU(CDU, fdtbl, DC, HTDC, HTAC){
- var EOB = HTAC[0x00];
- var M16zeroes = HTAC[0xF0];
- var pos;
- var I16 = 16;
- var I63 = 63;
- var I64 = 64;
- var DU_DCT = fDCTQuant(CDU, fdtbl);
- //ZigZag reorder
- for (var j=0;j<I64;++j) {
- DU[ZigZag[j]]=DU_DCT[j];
- }
- var Diff = DU[0] - DC; DC = DU[0];
- //Encode DC
- if (Diff==0) {
- writeBits(HTDC[0]); // Diff might be 0
- } else {
- pos = 32767+Diff;
- writeBits(HTDC[category[pos]]);
- writeBits(bitcode[pos]);
- }
- //Encode ACs
- var end0pos = 63; // was const... which is crazy
- for (; (end0pos>0)&&(DU[end0pos]==0); end0pos--) {};
- //end0pos = first element in reverse order !=0
- if ( end0pos == 0) {
- writeBits(EOB);
- return DC;
- }
- var i = 1;
- var lng;
- while ( i <= end0pos ) {
- var startpos = i;
- for (; (DU[i]==0) && (i<=end0pos); ++i) {}
- var nrzeroes = i-startpos;
- if ( nrzeroes >= I16 ) {
- lng = nrzeroes>>4;
- for (var nrmarker=1; nrmarker <= lng; ++nrmarker)
- writeBits(M16zeroes);
- nrzeroes = nrzeroes&0xF;
- }
- pos = 32767+DU[i];
- writeBits(HTAC[(nrzeroes<<4)+category[pos]]);
- writeBits(bitcode[pos]);
- i++;
- }
- if ( end0pos != I63 ) {
- writeBits(EOB);
- }
- return DC;
- }
-
- function initCharLookupTable(){
- var sfcc = String.fromCharCode;
- for(var i=0; i < 256; i++){ ///// ACHTUNG // 255
- clt[i] = sfcc(i);
- }
- }
-
-/**
- * Encodes ImageData to JPEG.
- *
- * @param {ImageData} image
- * @param {number=} opt_quality The compression quality.
- * @return {string} base64-encoded JPEG data.
- */
- this.encode = function(image,opt_quality) // image data object
- {
- if(opt_quality) setQuality(opt_quality);
-
- // Initialize bit writer
- byteout = new Array();
- bytenew=0;
- bytepos=7;
-
- // Add JPEG headers
- writeWord(0xFFD8); // SOI
- writeAPP0();
- writeDQT();
- writeSOF0(image.width,image.height);
- writeDHT();
- writeSOS();
-
-
- // Encode 8x8 macroblocks
- var _DCY=0;
- var _DCU=0;
- var _DCV=0;
-
- bytenew=0;
- bytepos=7;
-
-
- this.encode.displayName = "_encode_";
-
- var imageData = image.data;
- var width = image.width;
- var height = image.height;
-
- var quadWidth = width*4;
- var tripleWidth = width*3;
-
- var x, y = 0;
- var r, g, b;
- var start,p, col,row,pos;
- while(y < height){
- x = 0;
- while(x < quadWidth){
- start = quadWidth * y + x;
- p = start;
- col = -1;
- row = 0;
-
- for(pos=0; pos < 64; pos++){
- row = pos >> 3;// /8
- col = ( pos & 7 ) * 4; // %8
- p = start + ( row * quadWidth ) + col;
-
- if(y+row >= height){ // padding bottom
- p-= (quadWidth*(y+1+row-height));
- }
-
- if(x+col >= quadWidth){ // padding right
- p-= ((x+col) - quadWidth +4)
- }
-
- r = imageData[ p++ ];
- g = imageData[ p++ ];
- b = imageData[ p++ ];
-
-
- /* // calculate YUV values dynamically
- YDU[pos]=((( 0.29900)*r+( 0.58700)*g+( 0.11400)*b))-128; //-0x80
- UDU[pos]=(((-0.16874)*r+(-0.33126)*g+( 0.50000)*b));
- VDU[pos]=((( 0.50000)*r+(-0.41869)*g+(-0.08131)*b));
- */
-
- // use lookup table (slightly faster)
- YDU[pos] = ((RGB_YUV_TABLE[r] + RGB_YUV_TABLE[(g + 256)>>0] + RGB_YUV_TABLE[(b + 512)>>0]) >> 16)-128;
- UDU[pos] = ((RGB_YUV_TABLE[(r + 768)>>0] + RGB_YUV_TABLE[(g + 1024)>>0] + RGB_YUV_TABLE[(b + 1280)>>0]) >> 16)-128;
- VDU[pos] = ((RGB_YUV_TABLE[(r + 1280)>>0] + RGB_YUV_TABLE[(g + 1536)>>0] + RGB_YUV_TABLE[(b + 1792)>>0]) >> 16)-128;
-
- }
-
- _DCY = processDU(YDU, fdtbl_Y, _DCY, YDC_HT, YAC_HT);
- _DCU = processDU(UDU, fdtbl_UV, _DCU, UVDC_HT, UVAC_HT);
- _DCV = processDU(VDU, fdtbl_UV, _DCV, UVDC_HT, UVAC_HT);
- x+=32;
- }
- y+=8;
- }
-
-
- ////////////////////////////////////////////////////////////////
-
- // Do the bit alignment of the EOI marker
- if ( bytepos >= 0 ) {
- var fillbits = [];
- fillbits[1] = bytepos+1;
- fillbits[0] = (1<<(bytepos+1))-1;
- writeBits(fillbits);
- }
-
- writeWord(0xFFD9); //EOI
-
- var jpegDataUri = 'data:image/jpeg;base64,'
- + goog.crypt.base64.encodeString(byteout.join(''));
-
- byteout = [];
-
- return jpegDataUri
- }
-
- function setQuality(quality){
- if (quality <= 0) {
- quality = 1;
- }
- if (quality > 100) {
- quality = 100;
- }
-
- if(currentQuality == quality) return // don't recalc if unchanged
-
- var sf = 0;
- if (quality < 50) {
- sf = Math.floor(5000 / quality);
- } else {
- sf = Math.floor(200 - quality*2);
- }
-
- initQuantTables(sf);
- currentQuality = quality;
- }
-
- function init(){
- if(!opt_quality) opt_quality = 50;
- // Create tables
- initCharLookupTable()
- initHuffmanTbl();
- initCategoryNumber();
- initRGBYUVTable();
-
- setQuality(opt_quality);
- }
-
- init();
-
-};
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-30 10:34:37 +0000