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/// Copyright (c) 2008 Jeffrey Powers for Fluxcapacity Open Source.
/// Under the MIT License, details: License.txt.
using System;
#if SILVERLIGHT
#else
using System.Drawing;
using System.Drawing.Imaging;
#endif
namespace FluxJpeg.Core {
public struct ColorModel {
public ColorSpace colorspace;
public bool Opaque;
}
public enum ColorSpace { Gray, YCbCr, RGB }
public class Image {
private ColorModel _cm;
private byte[][,] _raster;
public byte[][,] Raster { get { return _raster; } }
public ColorModel ColorModel { get { return _cm; } }
/// <summary> X density (dots per inch).</summary>
public double DensityX { get; set; }
/// <summary> Y density (dots per inch).</summary>
public double DensityY { get; set; }
public int ComponentCount { get { return _raster.Length; } }
/// <summary>
/// Converts the colorspace of an image (in-place)
/// </summary>
/// <param name="cs">Colorspace to convert into</param>
/// <returns>Self</returns>
public Image ChangeColorSpace(ColorSpace cs) {
// Colorspace is already correct
if (_cm.colorspace == cs) return this;
byte[] ycbcr = new byte[3];
byte[] rgb = new byte[3];
if (_cm.colorspace == ColorSpace.RGB && cs == ColorSpace.YCbCr) {
/*
* Y' = + 0.299 * R'd + 0.587 * G'd + 0.114 * B'd
Cb = 128 - 0.168736 * R'd - 0.331264 * G'd + 0.5 * B'd
Cr = 128 + 0.5 * R'd - 0.418688 * G'd - 0.081312 * B'd
*
*/
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++) {
YCbCr.fromRGB(ref _raster[0][x, y], ref _raster[1][x, y], ref _raster[2][x, y]);
}
_cm.colorspace = ColorSpace.YCbCr;
} else if (_cm.colorspace == ColorSpace.YCbCr && cs == ColorSpace.RGB) {
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++) {
// 0 is LUMA
// 1 is BLUE
// 2 is RED
YCbCr.toRGB(ref _raster[0][x, y], ref _raster[1][x, y], ref _raster[2][x, y]);
}
_cm.colorspace = ColorSpace.RGB;
} else if (_cm.colorspace == ColorSpace.Gray && cs == ColorSpace.YCbCr) {
// To convert to YCbCr, we just add two 128-filled chroma channels
byte[,] Cb = new byte[width, height];
byte[,] Cr = new byte[width, height];
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++) {
Cb[x, y] = 128; Cr[x, y] = 128;
}
_raster = new byte[][,] { _raster[0], Cb, Cr };
_cm.colorspace = ColorSpace.YCbCr;
} else if (_cm.colorspace == ColorSpace.Gray && cs == ColorSpace.RGB) {
ChangeColorSpace(ColorSpace.YCbCr);
ChangeColorSpace(ColorSpace.RGB);
} else {
throw new Exception("Colorspace conversion not supported.");
}
return this;
}
private int width; private int height;
public int Width { get { return width; } }
public int Height { get { return height; } }
public Image(ColorModel cm, byte[][,] raster) {
width = raster[0].GetLength(0);
height = raster[0].GetLength(1);
_cm = cm;
_raster = raster;
}
public static byte[][,] CreateRaster(int width, int height, int bands) {
// Create the raster
byte[][,] raster = new byte[bands][,];
for (int b = 0; b < bands; b++)
raster[b] = new byte[width, height];
return raster;
}
delegate void ConvertColor(ref byte c1, ref byte c2, ref byte c3);
#if SILVERLIGHT
#else
public Bitmap ToBitmap()
{
ConvertColor ColorConverter;
switch(_cm.colorspace)
{
case ColorSpace.YCbCr:
ColorConverter = YCbCr.toRGB;
break;
default:
throw new Exception("Colorspace not supported yet.");
}
int _width = width;
int _height = height;
Bitmap bitmap = new Bitmap(_width, _height, PixelFormat.Format32bppArgb);
BitmapData bmData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height),
System.Drawing.Imaging.ImageLockMode.WriteOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
byte[] outColor = new byte[3];
byte[] inColor = new byte[3];
unsafe
{
int i = 0;
byte* ptrBitmap = (byte*)bmData.Scan0;
for (int y = 0; y < _height; y++)
{
for (int x = 0; x < _width; x++)
{
ptrBitmap[0] = (byte)_raster[0][x, y];
ptrBitmap[1] = (byte)_raster[1][x, y];
ptrBitmap[2] = (byte)_raster[2][x, y];
ColorConverter(ref ptrBitmap[0], ref ptrBitmap[1], ref ptrBitmap[2]);
// Swap RGB --> BGR
byte R = ptrBitmap[0];
ptrBitmap[0] = ptrBitmap[2];
ptrBitmap[2] = R;
ptrBitmap[3] = 255; /* 100% opacity */
ptrBitmap += 4; // advance to the next pixel
i++; // "
}
}
}
bitmap.UnlockBits(bmData);
return bitmap;
}
#endif
}
}
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