SculptMap.cs

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/*
 * Copyright (c) Contributors
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * 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
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 *       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 DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// to build without references to System.Drawing, comment this out
#define SYSTEM_DRAWING

using System;
using System.Collections.Generic;
using System.Text;

#if SYSTEM_DRAWING
using System.Drawing;
using System.Drawing.Imaging;

namespace PrimMesher
{
    public class SculptMap
    {
        public int width;
        public int height;
        public byte[] redBytes;
        public byte[] greenBytes;
        public byte[] blueBytes;

        public SculptMap()
        {
        }

        public SculptMap(Bitmap bm, int lod)
        {
            int bmW = bm.Width;
            int bmH = bm.Height;

            if (bmW == 0 || bmH == 0)
                throw new Exception("SculptMap: bitmap has no data");

            int numLodPixels = lod * lod;  // (32 * 2)^2  = 64^2 pixels for default sculpt map image

            bool smallMap = bmW * bmH <= numLodPixels;
            bool needsScaling = false;

            width = bmW;
            height = bmH;
            while (width * height > numLodPixels * 4)
            {
                width >>= 1;
                height >>= 1;
                needsScaling = true;
            }

            try
            {
                if (needsScaling)
                    bm = ScaleImage(bm, width, height);
            }

            catch (Exception e)
            {
                throw new Exception("Exception in ScaleImage(): e: " + e.ToString());
            }

            if (width * height > numLodPixels)
            {
                width >>= 1;
                height >>= 1;
            }

            int numBytes = (width + 1) * (height + 1);
            redBytes = new byte[numBytes];
            greenBytes = new byte[numBytes];
            blueBytes = new byte[numBytes];

            int byteNdx = 0;

            try
            {
                for (int y = 0; y <= height; y++)
                {
                    for (int x = 0; x <= width; x++)
                    {
                        Color c;

                        if (smallMap)
                            c = bm.GetPixel(x < width ? x : x - 1,
                                            y < height ? y : y - 1);
                        else
                            c = bm.GetPixel(x < width ? x * 2 : x * 2 - 1,
                                            y < height ? y * 2 : y * 2 - 1);

                        redBytes[byteNdx] = c.R;
                        greenBytes[byteNdx] = c.G;
                        blueBytes[byteNdx] = c.B;

                        ++byteNdx;
                    }
                }
            }
            catch (Exception e)
            {
                throw new Exception("Caught exception processing byte arrays in SculptMap(): e: " + e.ToString());
            }

            width++;
            height++;
        }

        public List<List<Coord>> ToRows(bool mirror)
        {
            int numRows = height;
            int numCols = width;

            List<List<Coord>> rows = new List<List<Coord>>(numRows);

            float pixScale = 1.0f / 255;

            int rowNdx, colNdx;
            int smNdx = 0;


            for (rowNdx = 0; rowNdx < numRows; rowNdx++)
            {
                List<Coord> row = new List<Coord>(numCols);
                for (colNdx = 0; colNdx < numCols; colNdx++)
                {

                    if (mirror)
                        row.Add(new Coord(-((float)redBytes[smNdx] * pixScale - 0.5f), ((float)greenBytes[smNdx] * pixScale - 0.5f), (float)blueBytes[smNdx] * pixScale - 0.5f));
                    else
                        row.Add(new Coord((float)redBytes[smNdx] * pixScale - 0.5f, (float)greenBytes[smNdx] * pixScale - 0.5f, (float)blueBytes[smNdx] * pixScale - 0.5f));

                    ++smNdx;
                }
                rows.Add(row);
            }
            return rows;
        }

        private Bitmap ScaleImage(Bitmap srcImage, int destWidth, int destHeight)
        {

            Bitmap scaledImage = new Bitmap(destWidth, destHeight, PixelFormat.Format24bppRgb);
            
            Color c;
            float xscale = srcImage.Width / destWidth;
            float yscale = srcImage.Height / destHeight;
            
            float sy = 0.5f;
            for (int y = 0; y < destHeight; y++)
            {
                float sx = 0.5f;
                for (int x = 0; x < destWidth; x++)
                {
                    try
                    {
                        c = srcImage.GetPixel((int)(sx), (int)(sy));
                        scaledImage.SetPixel(x, y, Color.FromArgb(c.R, c.G, c.B));
                    }
                    catch (IndexOutOfRangeException)
                    {
                    }

                    sx += xscale;
                }
                sy += yscale;
            }
            srcImage.Dispose();
            return scaledImage;
        }

    }        
    
    }
#endif