import

DSTexCompress/FreeImage/Wrapper/FreeImage.NET/cs/Samples/Sample 06 - Converting/MainForm.cs

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+using System;
+using System.Drawing;
+using System.Windows.Forms;
+using FreeImageAPI;
+using System.Drawing.Imaging;
+
+namespace Sample06
+{
+	public partial class MainForm : Form
+	{
+		[STAThread]
+		static void Main()
+		{
+			Application.EnableVisualStyles();
+			Application.SetCompatibleTextRenderingDefault(false);
+			Application.Run(new MainForm());
+		}
+
+		public MainForm()
+		{
+			InitializeComponent();
+		}
+
+		private void bExample01_Click(object sender, EventArgs e)
+		{
+			// Load bitmap
+			FIBITMAP dib = FreeImage.LoadEx("Sample.jpg");
+
+			// Check success
+			if (dib.IsNull)
+			{
+				MessageBox.Show("Could not load Sample.jpg", "Error");
+				return;
+			}
+
+			// Check whether bitmap is 24-bit
+			if (FreeImage.GetBPP(dib) != 24)
+			{
+				MessageBox.Show("Sample.jpg is not 24-bit.", "Error");
+				FreeImage.UnloadEx(ref dib);
+				return;
+			}
+
+			// Convert the 24-bit bitmap to 8-bit and forcing the result will be greyscale
+			dib = FreeImage.ConvertColorDepth(dib, FREE_IMAGE_COLOR_DEPTH.FICD_08_BPP | FREE_IMAGE_COLOR_DEPTH.FICD_FORCE_GREYSCALE, true);
+
+			if (FreeImage.GetBPP(dib) == 8)
+			{
+				// Convert the FreeImage-Bitmap into a .NET bitmap
+				Bitmap bitmap = FreeImage.GetBitmap(dib);
+
+				// Dispose the bitmap of the pictureBox
+				if (picBox.Image != null)
+				{
+					picBox.Image.Dispose();
+				}
+
+				// Assign the bitmap to the picturebox
+				picBox.Image = bitmap;
+			}
+
+			// Unload source bitmap
+			FreeImage.UnloadEx(ref dib);
+		}
+
+		private void bOriginal_Click(object sender, EventArgs e)
+		{
+			// Load bitmap
+			FIBITMAP dib = FreeImage.LoadEx("Sample.jpg");
+
+			// Check success
+			if (dib.IsNull)
+			{
+				MessageBox.Show("Could not load Sample.jpg", "Error");
+				return;
+			}
+
+			// Convert the FreeImage-Bitmap into a .NET bitmap
+			Bitmap bitmap = FreeImage.GetBitmap(dib);
+
+			// Check success
+			if (bitmap != null)
+			{
+				// Dispose old bitmap
+				if (picBox.Image != null)
+				{
+					picBox.Image.Dispose();
+				}
+
+				// Assign new bitmap
+				picBox.Image = bitmap;
+			}
+
+			// Unload bitmap
+			FreeImage.UnloadEx(ref dib);
+		}
+
+		private void bExample02_Click(object sender, EventArgs e)
+		{
+			FIBITMAP dib = FreeImage.LoadEx("Sample.jpg");
+
+			// Check success
+			if (dib.IsNull)
+			{
+				MessageBox.Show("Could not load Sample.jpg", "Error");
+				return;
+			}
+
+			// Convert bitmap to 8 bit
+			dib = FreeImage.ConvertColorDepth(dib, FREE_IMAGE_COLOR_DEPTH.FICD_08_BPP, true);
+
+			// Check whether conversion succeeded
+			if (FreeImage.GetBPP(dib) != 8)
+			{
+				MessageBox.Show("Converting Sample.jpg to 8-bit failed.", "Error");
+				FreeImage.UnloadEx(ref dib);
+				return;
+			}
+
+			// Convert the FreeImage-Bitmap into a .NET bitmap
+			Bitmap bitmap = FreeImage.GetBitmap(dib);
+
+			// Dispose old bitmap
+			if (picBox.Image != null)
+			{
+				picBox.Image.Dispose();
+			}
+
+			// Assign new bitmap
+			picBox.Image = bitmap;
+
+			// Unload bitmap
+			FreeImage.UnloadEx(ref dib);
+		}
+
+		private void bExample03_Click(object sender, EventArgs e)
+		{
+			// Load bitmap
+			Bitmap bitmap = (Bitmap)Bitmap.FromFile("Sample.jpg");
+
+			// Convert the .NET bitmap into a FreeImage-Bitmap
+			FIBITMAP dib = FreeImage.CreateFromBitmap(bitmap);
+
+			// Unload bitmap
+			bitmap.Dispose();
+
+			// Rescale the bitmap
+			FIBITMAP temp = FreeImage.Rescale(dib, 300, 300, FREE_IMAGE_FILTER.FILTER_BICUBIC);
+
+			// Unload bitmap
+			FreeImage.UnloadEx(ref dib);
+
+			Random rand = new Random();
+
+			// Rotate the bitmap
+			dib = FreeImage.Rotate(temp, rand.NextDouble() * 360d);
+
+			// Unload bitmap
+			FreeImage.UnloadEx(ref temp);
+
+			// Convert the FreeImage-Bitmap into a .NET bitmap
+			bitmap = FreeImage.GetBitmap(dib);
+
+			// Unload bitmap
+			FreeImage.UnloadEx(ref dib);
+
+			// Unload bitmap
+			if (picBox.Image != null)
+			{
+				picBox.Image.Dispose();
+			}
+
+			// Assign new bitmap
+			picBox.Image = bitmap;
+		}
+	}
+}