BitmapImage.cs

/**
Copyright 2014-2024 Robert McNeel and Associates

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
**/

using Rhino.Display;
using Rhino.Render;
using Rhino.Runtime.InteropWrappers;
using System;
using System.Drawing;

namespace RhinoCyclesCore
{
	public abstract class BitmapImage<T> : IDisposable
	{
		internal object Original;   //StdVectorByte or StdVectorFloat
		internal object Corrected;  //StdVectorByte or StdVectorFloat

		protected int W;
		protected int H;
		private bool disposedValue;

		public uint Id { get; }

		public bool IsLinear { get; }

		internal BitmapImage() { }

		protected static int ColorClamp(int ch)
		{
			if (ch < 0) return 0;
			return ch > 255 ? 255 : ch;
		}

		internal bool GammaApplied { get; set; }

		internal float GammaValueApplied { get; set; }

		public BitmapImage(uint id, object data, int w, int h, bool linear)
		{
			Id = id;

			W = w;
			H = h;

			IsLinear = linear;

			Original = data;
		}

		virtual public void ApplyGamma(float gamma)
		{
		}

		public object Data => IsLinear || !GammaApplied ? Original : Corrected;

		public void SaveBitmaps()
		{
			SavePixels(Original, $"{Id}_original");
			if (!IsLinear && Corrected != null)
			{
				SavePixels(Corrected, $"{Id}_corrected");
			}
		}

		protected virtual void SavePixels(object pixels, string name) {}

		protected abstract void CustomDispose();

		protected virtual void Dispose(bool disposing)
		{
			if (!disposedValue)
			{
				if (disposing)
				{
				}

				CustomDispose();
				disposedValue = true;
			}
		}

		~BitmapImage()
		{
			Dispose(disposing: false);
		}

		public void Dispose()
		{
			Dispose(disposing: true);
			GC.SuppressFinalize(this);
		}
	}

	public class ByteBitmap : BitmapImage<byte>
	{

		public ByteBitmap(uint id, StdVectorByte data, int w, int h, bool linear) : base(id, data, w, h, linear)
		{ }

		override public void ApplyGamma(float gamma)
		{
			if (!IsLinear && Math.Abs(gamma - 1.0f) > float.Epsilon)
			{
				if (null == Corrected || Math.Abs(gamma - GammaValueApplied) > float.Epsilon)
				{
					if (Corrected == null)
					{
						Corrected = new StdVectorByte(Original as StdVectorByte);
					}

					(Original as StdVectorByte).CopyTo(Corrected as StdVectorByte);

					ccl.CSycles.apply_gamma_to_byte_buffer((Corrected as StdVectorByte).Memory(), W*H*4, gamma);
				}
				GammaApplied = true;
				GammaValueApplied = gamma;
			}
			else
			{
				GammaApplied = false;
				Corrected = null;
			}
		}

		protected override void CustomDispose()
		{
			(Corrected as StdVectorByte)?.Dispose();
			(Original as StdVectorByte)?.Dispose();
		}

		protected override void SavePixels(object oPixels, string name)
		{
			Eto.Forms.Application.Instance.AsyncInvoke(() => {
				var pixels = (oPixels as StdVectorByte).ToArray();

				using (var rw = RenderWindow.Create(new Size(W, H)))
				{
					using (var ch = rw.OpenChannel(RenderWindow.StandardChannels.RGBA))
					{
						for (var x = 0; x < W; x++)
						{
							for (var y = 0; y < H; y++)
							{
								var i = y * W * 4 + x * 4;
								ch.SetValue(x, y, Color4f.FromArgb(pixels[i + 3] / 255.0f, pixels[i] / 255.0f, pixels[i + 1] / 255.0f, pixels[i + 2] / 255.0f));
							}
						}
					}
					var tmpfhdr = RenderEngine.TempPathForFile($"byte_{name}.exr");
					rw.SaveRenderImageAs(tmpfhdr, true);
				}
			});
		}
	}

	public class FloatBitmap : BitmapImage<float>
	{
		public FloatBitmap(uint id, StdVectorFloat data, int w, int h, bool linear) : base(id, data, w, h, linear)
		{ }

		override public void ApplyGamma(float gamma)
		{
			if (!IsLinear && Math.Abs(gamma - 1.0f) > float.Epsilon)
			{
				if (null == Corrected || Math.Abs(gamma - GammaValueApplied) > float.Epsilon)
				{
					if (Corrected == null)
					{
						Corrected = new StdVectorFloat(Original as StdVectorFloat);
					}
					(Original as StdVectorFloat).CopyTo(Corrected as StdVectorFloat);

					ccl.CSycles.apply_gamma_to_float_buffer((Corrected as StdVectorFloat).Memory(), W*H*4*4, gamma);

				}
				GammaApplied = true;
				GammaValueApplied = gamma;
			}
			else
			{
				GammaApplied = false;
				Corrected = null;
			}
		}

		protected override void CustomDispose()
		{
			(Original as StdVectorFloat)?.Dispose();
			(Corrected as StdVectorFloat)?.Dispose();
		}

		protected override void SavePixels(object oPixels, string name)
		{
			Eto.Forms.Application.Instance.AsyncInvoke(() =>
			{
				var pixels = (oPixels as StdVectorFloat).ToArray();

				using (var rw = RenderWindow.Create(new Size(W, H)))
				{
					using (var ch = rw.OpenChannel(RenderWindow.StandardChannels.RGBA))
					{
						for (var x = 0; x < W; x++)
						{
							for (var y = 0; y < H; y++)
							{
								var i = y * W * 4 + x * 4;
								ch.SetValue(x, y, Color4f.FromArgb(pixels[i + 3], pixels[i], pixels[i + 1], pixels[i + 2]));
							}
						}
					}
					var tmpfhdr = RenderEngine.TempPathForFile($"float_{ name}.exr");
					rw.SaveRenderImageAs(tmpfhdr, true);
				}
			});
		}

	}
}