/*
    Adobe Systems Incorporated(r) Source Code License Agreement
    Copyright(c) 2005 Adobe Systems Incorporated. All rights reserved.
    
    Please read this Source Code License Agreement carefully before using
    the source code.
    
    Adobe Systems Incorporated grants to you a perpetual, worldwide, non-exclusive, 
    no-charge, royalty-free, irrevocable copyright license, to reproduce,
    prepare derivative works of, publicly display, publicly perform, and
    distribute this source code and such derivative works in source or 
    object code form without any attribution requirements.  
    
    The name "Adobe Systems Incorporated" must not be used to endorse or promote products
    derived from the source code without prior written permission.
    
    You agree to indemnify, hold harmless and defend Adobe Systems Incorporated from and
    against any loss, damage, claims or lawsuits, including attorney's 
    fees that arise or result from your use or distribution of the source 
    code.
    
    THIS SOURCE CODE IS PROVIDED "AS IS" AND "WITH ALL FAULTS", WITHOUT 
    ANY TECHNICAL SUPPORT OR ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
    BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
    FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ALSO, THERE IS NO WARRANTY OF 
    NON-INFRINGEMENT, TITLE OR QUIET ENJOYMENT.  IN NO EVENT SHALL MACROMEDIA
    OR ITS SUPPLIERS 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 SOURCE CODE, EVEN IF
    ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.adobe.images
{
    import flash.geom.*;
    import flash.display.*;
    import flash.utils.*;
    
    /**
     * Class that converts BitmapData into a valid JPEG
     */        
    public class JPGEncoder
    {

        // Static table initialization
    
        private var ZigZag:Array = [
             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
        ];
    
        private var YTable:Array = new Array(64);
        private var UVTable:Array = new Array(64);
        private var fdtbl_Y:Array = new Array(64);
        private var fdtbl_UV:Array = new Array(64);
    
        private function initQuantTables(sf:int):void
        {
            var i:int;
            var t:Number;
            var YQT:Array = [
                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 (i = 0; i < 64; i++) {
                t = Math.floor((YQT[i]*sf+50)/100);
                if (t < 1) {
                    t = 1;
                } else if (t > 255) {
                    t = 255;
                }
                YTable[ZigZag[i]] = t;
            }
            var UVQT:Array = [
                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 (i = 0; i < 64; i++) {
                t = Math.floor((UVQT[i]*sf+50)/100);
                if (t < 1) {
                    t = 1;
                } else if (t > 255) {
                    t = 255;
                }
                UVTable[ZigZag[i]] = t;
            }
            var aasf:Array = [
                1.0, 1.387039845, 1.306562965, 1.175875602,
                1.0, 0.785694958, 0.541196100, 0.275899379
            ];
            i = 0;
            for (var row:int = 0; row < 8; row++)
            {
                for (var col:int = 0; col < 8; col++)
                {
                    fdtbl_Y[i]  = (1.0 / (YTable [ZigZag[i]] * aasf[row] * aasf[col] * 8.0));
                    fdtbl_UV[i] = (1.0 / (UVTable[ZigZag[i]] * aasf[row] * aasf[col] * 8.0));
                    i++;
                }
            }
        }
    
        private var YDC_HT:Array;
        private var UVDC_HT:Array;
        private var YAC_HT:Array;
        private var UVAC_HT:Array;
    
        private function computeHuffmanTbl(nrcodes:Array, std_table:Array):Array
        {
            var codevalue:int = 0;
            var pos_in_table:int = 0;
            var HT:Array = new Array();
            for (var k:int=1; k<=16; k++) {
                for (var j:int=1; j<=nrcodes[k]; j++) {
                    HT[std_table[pos_in_table]] = new BitString();
                    HT[std_table[pos_in_table]].val = codevalue;
                    HT[std_table[pos_in_table]].len = k;
                    pos_in_table++;
                    codevalue++;
                }
                codevalue*=2;
            }
            return HT;
        }
    
        private var std_dc_luminance_nrcodes:Array = [0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0];
        private var std_dc_luminance_values:Array = [0,1,2,3,4,5,6,7,8,9,10,11];
        private var std_ac_luminance_nrcodes:Array = [0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d];
        private var std_ac_luminance_values:Array = [
            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
        ];
    
        private var std_dc_chrominance_nrcodes:Array = [0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0];
        private var std_dc_chrominance_values:Array = [0,1,2,3,4,5,6,7,8,9,10,11];
        private var std_ac_chrominance_nrcodes:Array = [0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77];
        private var std_ac_chrominance_values:Array = [
            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
        ];
    
        private function initHuffmanTbl():void
        {
            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);
        }
    
        private var bitcode:Array = new Array(65535);
        private var category:Array = new Array(65535);
    
        private function initCategoryNumber():void
        {
            var nrlower:int = 1;
            var nrupper:int = 2;
            var nr:int;
            for (var cat:int=1; cat<=15; cat++) {
                //Positive numbers
                for (nr=nrlower; nr<nrupper; nr++) {
                    category[32767+nr] = cat;
                    bitcode[32767+nr] = new BitString();
                    bitcode[32767+nr].len = cat;
                    bitcode[32767+nr].val = nr;
                }
                //Negative numbers
                for (nr=-(nrupper-1); nr<=-nrlower; nr++) {
                    category[32767+nr] = cat;
                    bitcode[32767+nr] = new BitString();
                    bitcode[32767+nr].len = cat;
                    bitcode[32767+nr].val = nrupper-1+nr;
                }
                nrlower <<= 1;
                nrupper <<= 1;
            }
        }
    
        // IO functions
    
        private var byteout:ByteArray;
        private var bytenew:int = 0;
        private var bytepos:int = 7;
    
        private function writeBits(bs:BitString):void
        {
            var value:int = bs.val;
            var posval:int = bs.len-1;
            while ( posval >= 0 ) {
                if (value & uint(1 << posval) ) {
                    bytenew |= uint(1 << bytepos);
                }
                posval--;
                bytepos--;
                if (bytepos < 0) {
                    if (bytenew == 0xFF) {
                        writeByte(0xFF);
                        writeByte(0);
                    }
                    else {
                        writeByte(bytenew);
                    }
                    bytepos=7;
                    bytenew=0;
                }
            }
        }
    
        private function writeByte(value:int):void
        {
            byteout.writeByte(value);
        }
    
        private function writeWord(value:int):void
        {
            writeByte((value>>8)&0xFF);
            writeByte((value   )&0xFF);
        }
    
        // DCT & quantization core
    
        private function fDCTQuant(data:Array, fdtbl:Array):Array
        {
            var tmp0:Number, tmp1:Number, tmp2:Number, tmp3:Number, tmp4:Number, tmp5:Number, tmp6:Number, tmp7:Number;
            var tmp10:Number, tmp11:Number, tmp12:Number, tmp13:Number;
            var z1:Number, z2:Number, z3:Number, z4:Number, z5:Number, z11:Number, z13:Number;
            var i:int;
            /* Pass 1: process rows. */
            var dataOff:int=0;
            for (i=0; i<8; i++) {
                tmp0 = data[dataOff+0] + data[dataOff+7];
                tmp7 = data[dataOff+0] - data[dataOff+7];
                tmp1 = data[dataOff+1] + data[dataOff+6];
                tmp6 = data[dataOff+1] - data[dataOff+6];
                tmp2 = data[dataOff+2] + data[dataOff+5];
                tmp5 = data[dataOff+2] - data[dataOff+5];
                tmp3 = data[dataOff+3] + data[dataOff+4];
                tmp4 = data[dataOff+3] - data[dataOff+4];
    
                /* Even part */
                tmp10 = tmp0 + tmp3;    /* phase 2 */
                tmp13 = tmp0 - tmp3;
                tmp11 = tmp1 + tmp2;
                tmp12 = tmp1 - tmp2;
    
                data[dataOff+0] = tmp10 + tmp11; /* phase 3 */
                data[dataOff+4] = tmp10 - tmp11;
    
                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. */
                z5 = (tmp10 - tmp12) * 0.382683433; /* c6 */
                z2 = 0.541196100 * tmp10 + z5; /* c2-c6 */
                z4 = 1.306562965 * tmp12 + z5; /* c2+c6 */
                z3 = tmp11 * 0.707106781; /* c4 */
    
                z11 = tmp7 + z3;    /* phase 5 */
                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<8; i++) {
                tmp0 = data[dataOff+ 0] + data[dataOff+56];
                tmp7 = data[dataOff+ 0] - data[dataOff+56];
                tmp1 = data[dataOff+ 8] + data[dataOff+48];
                tmp6 = data[dataOff+ 8] - data[dataOff+48];
                tmp2 = data[dataOff+16] + data[dataOff+40];
                tmp5 = data[dataOff+16] - data[dataOff+40];
                tmp3 = data[dataOff+24] + data[dataOff+32];
                tmp4 = data[dataOff+24] - data[dataOff+32];
    
                /* Even part */
                tmp10 = tmp0 + tmp3;    /* phase 2 */
                tmp13 = tmp0 - tmp3;
                tmp11 = tmp1 + tmp2;
                tmp12 = tmp1 - tmp2;
    
                data[dataOff+ 0] = tmp10 + tmp11; /* phase 3 */
                data[dataOff+32] = tmp10 - tmp11;
    
                z1 = (tmp12 + tmp13) * 0.707106781; /* c4 */
                data[dataOff+16] = tmp13 + z1; /* phase 5 */
                data[dataOff+48] = 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. */
                z5 = (tmp10 - tmp12) * 0.382683433; /* c6 */
                z2 = 0.541196100 * tmp10 + z5; /* c2-c6 */
                z4 = 1.306562965 * tmp12 + z5; /* c2+c6 */
                z3 = tmp11 * 0.707106781; /* c4 */
    
                z11 = tmp7 + z3;    /* phase 5 */
                z13 = tmp7 - z3;
    
                data[dataOff+40] = z13 + z2; /* phase 6 */
                data[dataOff+24] = z13 - z2;
                data[dataOff+ 8] = z11 + z4;
                data[dataOff+56] = z11 - z4;
    
                dataOff++; /* advance pointer to next column */
            }
    
            // Quantize/descale the coefficients
            for (i=0; i<64; i++) {
                // Apply the quantization and scaling factor & Round to nearest integer
                data[i] = Math.round((data[i]*fdtbl[i]));
            }
            return data;
        }
    
        // Chunk writing
    
        private function writeAPP0():void
        {
            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
        }
    
        private function writeSOF0(width:int, height:int):void
        {
            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
        }
    
        private function writeDQT():void
        {
            writeWord(0xFFDB); // marker
            writeWord(132);       // length
            writeByte(0);
            var i:int;
            for (i=0; i<64; i++) {
                writeByte(YTable[i]);
            }
            writeByte(1);
            for (i=0; i<64; i++) {
                writeByte(UVTable[i]);
            }
        }
    
        private function writeDHT():void
        {
            writeWord(0xFFC4); // marker
            writeWord(0x01A2); // length
            var i:int;
    
            writeByte(0); // HTYDCinfo
            for (i=0; i<16; i++) {
                writeByte(std_dc_luminance_nrcodes[i+1]);
            }
            for (i=0; i<=11; i++) {
                writeByte(std_dc_luminance_values[i]);
            }
    
            writeByte(0x10); // HTYACinfo
            for (i=0; i<16; i++) {
                writeByte(std_ac_luminance_nrcodes[i+1]);
            }
            for (i=0; i<=161; i++) {
                writeByte(std_ac_luminance_values[i]);
            }
    
            writeByte(1); // HTUDCinfo
            for (i=0; i<16; i++) {
                writeByte(std_dc_chrominance_nrcodes[i+1]);
            }
            for (i=0; i<=11; i++) {
                writeByte(std_dc_chrominance_values[i]);
            }
    
            writeByte(0x11); // HTUACinfo
            for (i=0; i<16; i++) {
                writeByte(std_ac_chrominance_nrcodes[i+1]);
            }
            for (i=0; i<=161; i++) {
                writeByte(std_ac_chrominance_values[i]);
            }
        }
    
        private function writeSOS():void
        {
            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
        }
    
        // Core processing
        private var DU:Array = new Array(64);
    
        private function processDU(CDU:Array, fdtbl:Array, DC:Number, HTDC:Array, HTAC:Array):Number
        {
            var EOB:BitString = HTAC[0x00];
            var M16zeroes:BitString = HTAC[0xF0];
            var i:int;
    
            var DU_DCT:Array = fDCTQuant(CDU, fdtbl);
            //ZigZag reorder
            for (i=0;i<64;i++) {
                DU[ZigZag[i]]=DU_DCT[i];
            }
            var Diff:int = DU[0] - DC; DC = DU[0];
            //Encode DC
            if (Diff==0) {
                writeBits(HTDC[0]); // Diff might be 0
            } else {
                writeBits(HTDC[category[32767+Diff]]);
                writeBits(bitcode[32767+Diff]);
            }
            //Encode ACs
            var end0pos:int = 63;
            for (; (end0pos>0)&&(DU[end0pos]==0); end0pos--) {
            };
            //end0pos = first element in reverse order !=0
            if ( end0pos == 0) {
                writeBits(EOB);
                return DC;
            }
            i = 1;
            while ( i <= end0pos ) {
                var startpos:int = i;
                for (; (DU[i]==0) && (i<=end0pos); i++) {
                }
                var nrzeroes:int = i-startpos;
                if ( nrzeroes >= 16 ) {
                    for (var nrmarker:int=1; nrmarker <= nrzeroes/16; nrmarker++) {
                        writeBits(M16zeroes);
                    }
                    nrzeroes = int(nrzeroes&0xF);
                }
                writeBits(HTAC[nrzeroes*16+category[32767+DU[i]]]);
                writeBits(bitcode[32767+DU[i]]);
                i++;
            }
            if ( end0pos != 63 ) {
                writeBits(EOB);
            }
            return DC;
        }
    
        private var YDU:Array = new Array(64);
        private var UDU:Array = new Array(64);
        private var VDU:Array = new Array(64);
    
        private function RGB2YUV(img:BitmapData, xpos:int, ypos:int):void
        {
            var pos:int=0;
            for (var y:int=0; y<8; y++) {
                for (var x:int=0; x<8; x++) {
                    var P:uint = img.getPixel32(xpos+x,ypos+y);
                    var R:Number = Number((P>>16)&0xFF);
                    var G:Number = Number((P>> 8)&0xFF);
                    var B:Number = Number((P    )&0xFF);
                    YDU[pos]=((( 0.29900)*R+( 0.58700)*G+( 0.11400)*B))-128;
                    UDU[pos]=(((-0.16874)*R+(-0.33126)*G+( 0.50000)*B));
                    VDU[pos]=((( 0.50000)*R+(-0.41869)*G+(-0.08131)*B));
                    pos++;
                }
            }
        }
    
        /**
         * Constructor for JPEGEncoder class
         *
         * @param quality The quality level between 1 and 100 that detrmines the
         * level of compression used in the generated JPEG
         * @langversion ActionScript 3.0
         * @playerversion Flash 9.0
         * @tiptext
         */        
        public function JPGEncoder(quality:Number = 50)
        {
            if (quality <= 0) {
                quality = 1;
            }
            if (quality > 100) {
                quality = 100;
            }
            var sf:int = 0;
            if (quality < 50) {
                sf = int(5000 / quality);
            } else {
                sf = int(200 - quality*2);
            }
            // Create tables
            initHuffmanTbl();
            initCategoryNumber();
            initQuantTables(sf);
        }
    
        /**
         * Created a JPEG image from the specified BitmapData
         *
         * @param image The BitmapData that will be converted into the JPEG format.
         * @return a ByteArray representing the JPEG encoded image data.
         * @langversion ActionScript 3.0
         * @playerversion Flash 9.0
         * @tiptext
         */    
        public function encode(image:BitmapData):ByteArray
        {
            // Initialize bit writer
            byteout = new ByteArray();
            bytenew=0;
            bytepos=7;
    
            // Add JPEG headers
            writeWord(0xFFD8); // SOI
            writeAPP0();
            writeDQT();
            writeSOF0(image.width,image.height);
            writeDHT();
            writeSOS();

    
            // Encode 8x8 macroblocks
            var DCY:Number=0;
            var DCU:Number=0;
            var DCV:Number=0;
            bytenew=0;
            bytepos=7;
            for (var ypos:int=0; ypos<image.height; ypos+=8) {
                for (var xpos:int=0; xpos<image.width; xpos+=8) {
                    RGB2YUV(image, xpos, ypos);
                    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);
                }
            }
    
            // Do the bit alignment of the EOI marker
            if ( bytepos >= 0 ) {
                var fillbits:BitString = new BitString();
                fillbits.len = bytepos+1;
                fillbits.val = (1<<(bytepos+1))-1;
                writeBits(fillbits);
            }
    
            writeWord(0xFFD9); //EOI
            return byteout;
        }
    }
}