88 lines
3.0 KiB
C#
88 lines
3.0 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="WbmpConverter.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.UI.Design.MobileControls.Util
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{
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using System;
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using System.Drawing;
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using System.Diagnostics;
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[
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System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand,
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Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)
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]
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[Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
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internal class WbmpConverter
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{
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private static int ExtractMultiByte(Byte[] buffer, ref int cursor)
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{
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int sum = 0;
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do
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{
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sum <<= 7;
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sum += buffer[cursor] & 0x7F;
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}
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while((buffer[cursor++] & 0x80) != 0);
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return sum;
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}
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internal static Bitmap Convert(Byte[] buffer)
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{
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try
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{
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int cursor = 0;
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int type = buffer[cursor++];
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if(type != 0)
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{
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Debug.Fail("Wbmp is not type 0. (Unsupported)");
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return null;
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}
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int header = buffer[cursor++];
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int width = ExtractMultiByte(buffer, ref cursor);
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int height = ExtractMultiByte(buffer, ref cursor);
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Bitmap bitmap = new Bitmap(width, height);
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Byte mask = 0x80;
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for(int y = 0; y < height; y++)
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{
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for(int x = 0; x < width; x++)
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{
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if((buffer[cursor] & mask) == 0)
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{
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bitmap.SetPixel(x, y, Color.Black);
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}
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else
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{
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bitmap.SetPixel(x, y, Color.White);
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}
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mask >>= 1;
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if(mask == 0)
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{
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mask = 0x80;
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cursor++;
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}
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}
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// each row starts at the beginning of an octet
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if(mask != 0x80)
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{
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mask = 0x80;
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cursor++;
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}
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}
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return bitmap;
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}
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catch
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{
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Debug.Fail("Wbmp file appears to be corrupt.");
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return null;
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}
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}
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}
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}
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