ImageCodecInfo.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Advanced / ImageCodecInfo.cs / 1 / ImageCodecInfo.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/*************************************************************************\ 
* 
* Copyright (c) 1998-1999, Microsoft Corp.  All Rights Reserved.
* 
* Module Name:
*
*   ImageCodecInfo.cs
* 
* Abstract:
* 
*   Native GDI+ ImageCodecInfo structure. 
*
* Revision History: 
*
*   9/22/1999 [....]
*       Created it.
* 
\**************************************************************************/
 
namespace System.Drawing.Imaging { 
    using System.Text;
    using System.Runtime.InteropServices; 
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System;
    using System.Drawing; 
    using System.Drawing.Internal;
 
    // sdkinc\imaging.h 
    /// 
    ///  
    ///    [To be supplied.]
    /// 
    public sealed class ImageCodecInfo {
         Guid clsid; 
         Guid formatID;
         string codecName; 
         string dllName; 
         string formatDescription;
         string filenameExtension; 
         string mimeType;
         ImageCodecFlags flags;
         int version;
         byte[][] signaturePatterns; 
         byte[][] signatureMasks;
 
         internal ImageCodecInfo() { 
         }
 
         /// 
         /// 
         ///    [To be supplied.]
         ///  
         public Guid Clsid {
             get { return clsid; } 
             set { clsid = value; } 
         }
         ///  
         /// 
         ///    [To be supplied.]
         /// 
         public Guid FormatID { 
             get { return formatID; }
             set { formatID = value; } 
         } 
         /// 
         ///  
         ///    [To be supplied.]
         /// 
         public string CodecName {
             get { return codecName; } 
             set { codecName = value; }
         } 
         ///  
         /// 
         ///    [To be supplied.] 
         /// 
         public string DllName {
             [SuppressMessage("Microsoft.Security", "CA2103:ReviewImperativeSecurity")]
             get { 
                 if (dllName != null) {
                     //a valid path is a security concern, demand 
                     //path discovery permission.... 
                     new System.Security.Permissions.FileIOPermission(System.Security.Permissions.FileIOPermissionAccess.PathDiscovery, dllName).Demand();
                 } 
                 return dllName;
             }
             [SuppressMessage("Microsoft.Security", "CA2103:ReviewImperativeSecurity")]
             set { 
                 if (value != null) {
                     //a valid path is a security concern, demand 
                     //path discovery permission.... 
                     new System.Security.Permissions.FileIOPermission(System.Security.Permissions.FileIOPermissionAccess.PathDiscovery, value).Demand();
                 } 
                 dllName = value;
             }
         }
         ///  
         /// 
         ///    [To be supplied.] 
         ///  
         public string FormatDescription {
             get { return formatDescription; } 
             set { formatDescription = value; }
         }
         /// 
         ///  
         ///    [To be supplied.]
         ///  
         public string FilenameExtension { 
             get { return filenameExtension; }
             set { filenameExtension = value; } 
         }
         /// 
         /// 
         ///    [To be supplied.] 
         /// 
         public string MimeType { 
             get { return mimeType; } 
             set { mimeType = value; }
         } 
         /// 
         /// 
         ///    [To be supplied.]
         ///  
         public ImageCodecFlags Flags {
             get { return flags; } 
             set { flags = value; } 
         }
         ///  
         /// 
         ///    [To be supplied.]
         /// 
         public int Version { 
             get { return version; }
             set { version = value; } 
         } 
         /// 
         ///  
         ///    [To be supplied.]
         /// 
         [CLSCompliant(false)]
         public byte[][] SignaturePatterns { 
             get { return signaturePatterns; }
             set { signaturePatterns = value; } 
         } 
         /// 
         ///  
         ///    [To be supplied.]
         /// 
         [CLSCompliant(false)]
         public byte[][] SignatureMasks { 
             get { return signatureMasks; }
             set { signatureMasks = value; } 
         } 

         // Encoder/Decoder selection APIs 

         /// 
         /// 
         ///    [To be supplied.] 
         /// 
         public static ImageCodecInfo[] GetImageDecoders() { 
             ImageCodecInfo[] imageCodecs; 
             int numDecoders;
             int size; 

             int status = SafeNativeMethods.Gdip.GdipGetImageDecodersSize(out numDecoders, out size);

             if (status != SafeNativeMethods.Gdip.Ok) { 
                 throw SafeNativeMethods.Gdip.StatusException(status);
             } 
 
             IntPtr memory = Marshal.AllocHGlobal(size);
 
             try {
                 status = SafeNativeMethods.Gdip.GdipGetImageDecoders(numDecoders, size, memory);

                 if (status != SafeNativeMethods.Gdip.Ok) { 
                     throw SafeNativeMethods.Gdip.StatusException(status);
                 } 
 
                 imageCodecs = ImageCodecInfo.ConvertFromMemory(memory, numDecoders);
             } 
             finally {
                 Marshal.FreeHGlobal(memory);
             }
 
             return imageCodecs;
         } 
 
         /// 
         ///  
         ///    [To be supplied.]
         /// 
         public static ImageCodecInfo[] GetImageEncoders() {
             ImageCodecInfo[] imageCodecs; 
             int numEncoders;
             int size; 
 
             int status = SafeNativeMethods.Gdip.GdipGetImageEncodersSize(out numEncoders, out size);
 
             if (status != SafeNativeMethods.Gdip.Ok) {
                 throw SafeNativeMethods.Gdip.StatusException(status);
             }
 
             IntPtr memory = Marshal.AllocHGlobal(size);
 
             try { 
                 status = SafeNativeMethods.Gdip.GdipGetImageEncoders(numEncoders, size, memory);
 
                 if (status != SafeNativeMethods.Gdip.Ok) {
                     throw SafeNativeMethods.Gdip.StatusException(status);
                 }
 
                 imageCodecs = ImageCodecInfo.ConvertFromMemory(memory, numEncoders);
             } 
             finally { 
                 Marshal.FreeHGlobal(memory);
             } 

             return imageCodecs;
         }
 
        /* FxCop rule 'AvoidBuildingNonCallableCode' - Left here in case it is needed in the future.
         internal static ImageCodecInfoPrivate ConvertToMemory(ImageCodecInfo imagecs) 
         { 
             ImageCodecInfoPrivate imagecsp = new ImageCodecInfoPrivate();
 
             imagecsp.Clsid = imagecs.Clsid;
             imagecsp.FormatID = imagecs.FormatID;

             imagecsp.CodecName = Marshal.StringToHGlobalUni(imagecs.CodecName); 
             imagecsp.DllName = Marshal.StringToHGlobalUni(imagecs.DllName);
             imagecsp.FormatDescription = Marshal.StringToHGlobalUni(imagecs.FormatDescription); 
             imagecsp.FilenameExtension = Marshal.StringToHGlobalUni(imagecs.FilenameExtension); 
             imagecsp.MimeType = Marshal.StringToHGlobalUni(imagecs.MimeType);
 
             imagecsp.Flags = (int)imagecs.Flags;
             imagecsp.Version = (int)imagecs.Version;
             imagecsp.SigCount = imagecs.SignaturePatterns.Length;
             imagecsp.SigSize = imagecs.SignaturePatterns[0].Length; 

             imagecsp.SigPattern = Marshal.AllocHGlobal(imagecsp.SigCount*imagecsp.SigSize); 
             imagecsp.SigMask = Marshal.AllocHGlobal(imagecsp.SigCount*imagecsp.SigSize); 

             for (int i=0; i

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