95 lines
3.8 KiB
C#
95 lines
3.8 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Runtime.InteropServices;
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using System.IO;
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using System.Drawing;
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using System.Drawing.Imaging;
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namespace LibwebpSharp
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{
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/// <summary>
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///
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/// </summary>
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public static class Utilities
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{
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/// <summary>
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/// Copy data from managed to unmanaged memory
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/// </summary>
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/// <param name="data">The data you want to copy</param>
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/// <returns>Pointer to the location of the unmanaged data</returns>
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public static IntPtr CopyDataToUnmanagedMemory(byte[] data)
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{
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// Initialize unmanged memory to hold the array
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int size = Marshal.SizeOf(data[0]) * data.Length;
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IntPtr pnt = Marshal.AllocHGlobal(size);
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// Copy the array to unmanaged memory
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Marshal.Copy(data, 0, pnt, data.Length);
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return pnt;
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}
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/// <summary>
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/// Get data from unmanaged memory back to managed memory
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/// </summary>
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/// <param name="source">A Pointer where the data lifes</param>
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/// <param name="lenght">How many bytes you want to copy</param>
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/// <returns></returns>
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public static byte[] GetDataFromUnmanagedMemory(IntPtr source, int lenght)
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{
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// Initialize managed memory to hold the array
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byte[] data = new byte[lenght];
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// Copy the array back to managed memory
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Marshal.Copy(source, data, 0, lenght);
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return data;
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}
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/// <summary>
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/// Get a file from the disk and copy it into a managed byte array
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/// </summary>
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/// <param name="path">The path to the file</param>
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/// <returns>A byte array containing the file</returns>
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public static byte[] CopyFileToManagedArray(string path)
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{
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// Load file from disk and copy it into a byte array
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FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
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byte[] data = new byte[fs.Length];
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fs.Read(data, 0, (int)fs.Length);
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fs.Close();
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return data;
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}
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/// <summary>
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/// Convert raw image data into a Bitmap object
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/// </summary>
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/// <param name="data">The byte array containing the image data</param>
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/// <param name="imgWidth">The width of your image</param>
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/// <param name="imgHeight">The height of your image</param>
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/// <param name="format">The PixelFormat the Bitmap should use</param>
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/// <returns>The Bitmap object conating you image</returns>
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public static Bitmap ConvertDataToBitmap(byte[] data, int imgWidth, int imgHeight, PixelFormat format)
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{
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// Create the Bitmap to the know height, width and format
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Bitmap bmp = new Bitmap(imgWidth, imgHeight, format);
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// Create a BitmapData and Lock all pixels to be written
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BitmapData bmpData = bmp.LockBits( new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.WriteOnly, bmp.PixelFormat);
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//Copy the data from the byte array into BitmapData.Scan0
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Marshal.Copy(data, 0, bmpData.Scan0, data.Length);
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//Unlock the pixels
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bmp.UnlockBits(bmpData);
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//Return the bitmap
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return bmp;
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}
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/// <summary>
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/// Calculate the needed size for a bitmap
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/// </summary>
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/// <param name="imgWidth">The image width</param>
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/// <param name="imgHeight">The image height</param>
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/// <param name="format">The pixel format you want to use</param>
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/// <returns>The bitmap size in bytes</returns>
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public static int CalculateBitmapSize(int imgWidth, int imgHeight, PixelFormat format)
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{
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return imgWidth * imgHeight * Image.GetPixelFormatSize(format) / 8;
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}
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}
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}
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