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Diffstat (limited to 'vendors/uploadify/com/adobe/images/JPGEncoder.as')
| -rw-r--r-- | vendors/uploadify/com/adobe/images/JPGEncoder.as | 648 |
1 files changed, 0 insertions, 648 deletions
diff --git a/vendors/uploadify/com/adobe/images/JPGEncoder.as b/vendors/uploadify/com/adobe/images/JPGEncoder.as deleted file mode 100644 index 100d7e968..000000000 --- a/vendors/uploadify/com/adobe/images/JPGEncoder.as +++ /dev/null @@ -1,648 +0,0 @@ -/*
- 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.
-*/
-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;
- }
- }
-}
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