metaClient/Assets/Mega-Fiers/Scripts/MegaGrab/JPGEncoder.cs


#if !UNITY_FLASH && !UNITY_METRO && !UNITY_WP8
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.IO;

public class ByteArray
{
	private MemoryStream	stream;
	private BinaryWriter		writer;

	public ByteArray()
	{
		stream = new MemoryStream();
		writer = new BinaryWriter(stream);
	}

	/**
	* Function from AS3--add a byte to our stream
	*/
	public void writeByte(byte value)
	{
		writer.Write(value);
	}

	/**
	* Spit back all bytes--to either pass via WWW or save to disk
	*/
	public byte[] GetAllBytes()
	{
		byte[] buffer = new byte[stream.Length];
		stream.Position = 0;
		stream.Read(buffer, 0, buffer.Length);

		return buffer;
	}
}

/**
* This should really be a struct--if you care, declare it in C#
*/
class BitString
{
	public int len = 0;
	public int val = 0;
}

/**
* Another flash class--emulating the stuff the encoder uses
*/
public class BitmapData
{
	public int height;
	public int width;

	private Color[] pixels;

	/**
	* Pull all of our pixels off the texture (Unity stuff isn't thread safe, and this is faster)
	*/
	public BitmapData(Color[] _pixels, int _width, int _height)
	{
		height = _height;
		width = _width;

		pixels = _pixels;
	}

	public BitmapData(Texture2D texture)
	{
		height = texture.height;
		width = texture.width;

		pixels = texture.GetPixels();
	}

	/**
	* Mimic the flash function
	*/
	public Color getPixelColor(int x, int y)
	{
		if ( x >= width )
			x = width - 1;

		if ( y >= height )
			y = height - 1;

		if ( x < 0 )
			x = 0;

		if ( y < 0 )
			y = 0;

		return pixels[y * width + x];
	}
}

/**
 * Class that converts BitmapData into a valid JPEG
 */
public class JPGEncoder
{

	// Static table initialization

	public int[] ZigZag = new int[64] {
		 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 int[] YTable = new int[64];
	private int[] UVTable = new int[64];
	private float[] fdtbl_Y = new float[64];
	private float[] fdtbl_UV = new float[64];

	private void initQuantTables(int sf)
	{
		int i;
		float t;
		int[] YQT = new int[64] {
			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 = Mathf.Floor((YQT[i] * sf + 50.0f) / 100.0f);
			if ( t < 1.0f )
			{
				t = 1.0f;
			}
			else if ( t > 255.0f )
			{
				t = 255.0f;
			}
			YTable[ZigZag[i]] = (int)t;
		}

		int[] UVQT = new int[64] {
			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 = Mathf.Floor((UVQT[i] * sf + 50.0f) / 100.0f);
			if ( t < 1.0f )
			{
				t = 1.0f;
			}
			else if ( t > 255.0f )
			{
				t = 255.0f;
			}
			UVTable[ZigZag[i]] = (int)t;
		}

		float[] aasf = new float[8] {
			1.0f, 1.387039845f, 1.306562965f, 1.175875602f,
			1.0f, 0.785694958f, 0.541196100f, 0.275899379f
		};

		i = 0;
		for ( int row  = 0; row < 8; row++ )
		{
			for ( int col = 0; col < 8; col++ )
			{
				fdtbl_Y[i] = (1.0f / (YTable[ZigZag[i]] * aasf[row] * aasf[col] * 8.0f));
				fdtbl_UV[i] = (1.0f / (UVTable[ZigZag[i]] * aasf[row] * aasf[col] * 8.0f));
				i++;
			}
		}
	}

	private BitString[] YDC_HT;
	private BitString[] UVDC_HT;
	private BitString[] YAC_HT;
	private BitString[] UVAC_HT;

	private BitString[] computeHuffmanTbl(int[] nrcodes, int[] std_table)
	{
		int codevalue = 0;
		int pos_in_table = 0;
		BitString[] HT = new BitString[16 * 16];
		for ( int k = 1; k <= 16; k++ )
		{
			for ( int j = 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 int[] std_dc_luminance_nrcodes = new int[17] { 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
	private int[] std_dc_luminance_values = new int[12] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
	private int[] std_ac_luminance_nrcodes = new int[17] { 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
	private int[] std_ac_luminance_values = new int[162] {
		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 int[]  std_dc_chrominance_nrcodes = new int[17] { 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
	private int[]  std_dc_chrominance_values = new int[12] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
	private int[]  std_ac_chrominance_nrcodes = new int[17] { 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
	private int[]  std_ac_chrominance_values = new int[162] {
		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 void 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);
	}


	private BitString[] bitcode = new BitString[65535];
	private int[] category = new int[65535];

	private void initCategoryfloat()
	{
		int nrlower = 1;
		int nrupper = 2;
		int nr;
		BitString bs;

		for ( int cat = 1; cat <= 15; cat++ )
		{
			//Positive numbers
			for ( nr = nrlower; nr < nrupper; nr++ )
			{
				category[32767 + nr] = cat;

				bs = new BitString();
				bs.len = cat;
				bs.val = nr;
				bitcode[32767 + nr] = bs;
			}
			//Negative numbers
			for ( nr = -(nrupper - 1); nr <= -nrlower; nr++ )
			{
				category[32767 + nr] = cat;

				bs = new BitString();
				bs.len = cat;
				bs.val = nrupper - 1 + nr;
				bitcode[32767 + nr] = bs;
			}
			nrlower <<= 1;
			nrupper <<= 1;
		}
	}

	// IO functions
	private int bytenew = 0;
	private int bytepos = 7;
	public ByteArray byteout = new ByteArray();

	/**
	* Get the result
	*/
	public byte[] GetBytes()
	{
		if ( !isDone )
		{
			Debug.LogError("JPEGEncoder not complete, cannot get bytes!");
			return new byte[1];
		}

		return byteout.GetAllBytes();
	}

	private void writeBits(BitString bs)
	{
		int value = bs.val;
		int posval = bs.len - 1;
		while ( posval >= 0 )
		{
			if ( ((uint)value & System.Convert.ToUInt32(1 << posval)) != 0 )
			{
				bytenew |= (int)(System.Convert.ToUInt32(1 << bytepos));
			}
			posval--;
			bytepos--;
			if ( bytepos < 0 )
			{
				if ( bytenew == 0xFF )
				{
					writeByte(0xFF);
					writeByte(0);
				}
				else
				{
					writeByte((byte)bytenew);
				}
				bytepos = 7;
				bytenew = 0;
			}
		}
	}

	private void writeByte(byte value)
	{
		byteout.writeByte(value);
	}

	private void writeWord(int value)
	{
		writeByte((byte)((value >> 8) & 0xFF));
		writeByte((byte)((value) & 0xFF));
	}

	// DCT & quantization core

	private float[] fDCTQuant(float[] data, float[] fdtbl)
	{
		float tmp0; float tmp1; float tmp2; float tmp3; float tmp4; float tmp5; float tmp6; float tmp7;
		float tmp10; float tmp11; float tmp12; float tmp13;

		float z1; float z2; float z3; float z4; float z5; float z11; float z13;

		int i;

		/* Pass 1: process rows. */
		int dataOff = 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) * 0.707106781f; /* 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) * 0.382683433f; /* c6 */
			z2 = 0.541196100f * tmp10 + z5; /* c2-c6 */
			z4 = 1.306562965f * tmp12 + z5; /* c2+c6 */
			z3 = tmp11 * 0.707106781f; /* 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) * 0.707106781f; /* 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) * 0.382683433f; /* c6 */
			z2 = 0.541196100f * tmp10 + z5; /* c2-c6 */
			z4 = 1.306562965f * tmp12 + z5; /* c2+c6 */
			z3 = tmp11 * 0.707106781f; /* 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] = Mathf.Round((data[i] * fdtbl[i]));
		}
		return data;
	}

	// Chunk writing

	private void 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
	}

	private void writeSOF0(int width, int 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
	}

	private void writeDQT()
	{
		writeWord(0xFFDB); // marker
		writeWord(132);	   // length
		writeByte(0);
		int i;
		for ( i = 0; i < 64; i++ )
		{
			writeByte((byte)(YTable[i]));
		}
		writeByte(1);
		for ( i = 0; i < 64; i++ )
		{
			writeByte((byte)(UVTable[i]));
		}
	}

	private void writeDHT()
	{
		writeWord(0xFFC4); // marker
		writeWord(0x01A2); // length
		int i;

		writeByte(0); // HTYDCinfo
		for ( i = 0; i < 16; i++ )
		{
			writeByte((byte)(std_dc_luminance_nrcodes[i + 1]));
		}
		for ( i = 0; i <= 11; i++ )
		{
			writeByte((byte)(std_dc_luminance_values[i]));
		}

		writeByte(0x10); // HTYACinfo
		for ( i = 0; i < 16; i++ )
		{
			writeByte((byte)(std_ac_luminance_nrcodes[i + 1]));
		}
		for ( i = 0; i <= 161; i++ )
		{
			writeByte((byte)(std_ac_luminance_values[i]));
		}

		writeByte(1); // HTUDCinfo
		for ( i = 0; i < 16; i++ )
		{
			writeByte((byte)(std_dc_chrominance_nrcodes[i + 1]));
		}
		for ( i = 0; i <= 11; i++ )
		{
			writeByte((byte)(std_dc_chrominance_values[i]));
		}

		writeByte(0x11); // HTUACinfo
		for ( i = 0; i < 16; i++ )
		{
			writeByte((byte)(std_ac_chrominance_nrcodes[i + 1]));
		}
		for ( i = 0; i <= 161; i++ )
		{
			writeByte((byte)(std_ac_chrominance_values[i]));
		}
	}

	private void 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
	}

	// Core processing
	private int[] DU = new int[64];

	private float processDU(float[] CDU, float[] fdtbl, float DC, BitString[] HTDC, BitString[] HTAC)
	{
		BitString EOB = HTAC[0x00];
		BitString M16zeroes = HTAC[0xF0];
		int i;

		float[] DU_DCT = fDCTQuant(CDU, fdtbl);

		//ZigZag reorder
		for ( i = 0; i < 64; i++ )
		{
			DU[ZigZag[i]] = (int)(DU_DCT[i]);
		}
		int 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
		int end0pos = 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 )
		{
			int startpos = i;
			for ( ; (DU[i] == 0) && (i <= end0pos); i++ )
			{
			}
			int nrzeroes = i - startpos;
			if ( nrzeroes >= 16 )
			{
				for ( int nrmarker =1; nrmarker <= nrzeroes / 16; nrmarker++ )
				{
					writeBits(M16zeroes);
				}
				nrzeroes = (nrzeroes & 0xF);
			}
			writeBits(HTAC[nrzeroes * 16 + category[32767 + DU[i]]]);
			writeBits(bitcode[32767 + DU[i]]);
			i++;
		}
		if ( end0pos != 63 )
		{
			writeBits(EOB);
		}
		return DC;
	}

	private float[] YDU = new float[64];
	private float[] UDU = new float[64];
	private float[] VDU = new float[64];

	private void RGB2YUV(BitmapData img, int xpos, int ypos)
	{
		int pos = 0;
		for ( int y=0; y < 8; y++ )
		{
			for ( int x=0; x < 8; x++ )
			{
				Color C = img.getPixelColor(xpos + x, img.height - (ypos + y));
				float R = C.r * 255.0f;
				float G = C.g * 255.0f;
				float B = C.b * 255.0f;
				YDU[pos] = (((0.29900f) * R + (0.58700f) * G + (0.11400f) * B)) - 128.0f;
				UDU[pos] = (((-0.16874f) * R + (-0.33126f) * G + (0.50000f) * B));
				VDU[pos] = (((0.50000f) * R + (-0.41869f) * G + (-0.08131f) * 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 flag--other scripts must watch this to know when they can safely get data out
	public	bool isDone = false;
	private	BitmapData image;
	private	int sf = 0;

	public JPGEncoder(Color[] pixels, int width, int height, float quality)
	{
		// save out texture data to our own data structure
		image = new BitmapData(pixels, width, height);

		if ( quality <= 0.0f )
			quality = 1.0f;

		if ( quality > 100.0f )
			quality = 100.0f;

		if ( quality < 50.0f )
			sf = (int)(5000.0f / quality);
		else
			sf = (int)(200.0f - quality * 2.0f);
	}

	/**
	* Handle our initialization and encoding
	*/
	public void doEncoding()
	{
		isDone = false;

		// Create tables -- technically we could only do this once for multiple encodes
		initHuffmanTbl();
		initCategoryfloat();
		initQuantTables(sf);

		// Do actual encoding
		encode();

		// signal that our data is ok to use now
		isDone = true;

		// tell the thread to stop--not sure if this is actually needed
		image = null;
	}

	/**
	 * 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
	 */
	private void encode()
	{
		// 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
		float DCY =0.0f;
		float DCU =0.0f;
		float DCV =0.0f;
		bytenew = 0;
		bytepos = 7;
		for ( int ypos=0; ypos < image.height; ypos += 8 )
		{
			for ( int xpos =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);

				// let other threads do stuff too
				//Thread.Sleep(0);
			}
		}

		// Do the bit alignment of the EOI marker
		if ( bytepos >= 0 )
		{
			BitString fillbits = new BitString();
			fillbits.len = bytepos + 1;
			fillbits.val = (1 << (bytepos + 1)) - 1;
			writeBits(fillbits);
		}

		writeWord(0xFFD9); //EOI
		//return byteout;
		isDone = true;
	}
}

/*
* Ported to UnityScript by Matthew Wegner, Flashbang Studios
* 
* Original code is from as3corelib, found here:
* http://code.google.com/p/as3corelib/source/browse/trunk/src/com/adobe/images/JPGEncoder.as
* 
* Original copyright notice is below:
*/

/*
* Ported to C# by Tony McBride
*
* C# version isnt threaded so just call like this:
* JPGEncoder NewEncoder = new JPGEncoder( MyTexture , 75.0f );
* NewEncoder.doEncoding();
* byte[] TexData = NewEncoder.GetBytes();
*/
#endif