ColorTransformHelper.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / ColorTransformHelper.cs / 1 / ColorTransformHelper.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Windows Client Platform
//  Copyright (c) Microsoft Corporation, 2001, 2002, 2003
//
//  File: ColorTransformHelper.cs 
//-----------------------------------------------------------------------------
using System; 
using System.IO; 
using System.Runtime.InteropServices;
using System.Windows.Media; 
using System.Windows.Media.Imaging;
using MS.Internal;
using MS.Win32;
using System.Security; 
using System.Security.Permissions;
using System.Collections; 
using System.ComponentModel; 
using System.ComponentModel.Design.Serialization;
using System.Reflection; 
using System.Diagnostics;
using System.Globalization;
using Microsoft.Win32.SafeHandles;
using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID;
using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; 
 
namespace System.Windows.Media
{ 
    #region ColorTransformHandle

    internal class ColorTransformHandle : SafeHandleZeroOrMinusOneIsInvalid
    { 
        /// 
        /// Use this constructor if the handle exists at construction time. 
        ///  
        /// 
        ///    Critical: The ctor of the base class requires SecurityPermission 
        /// 
        [SecurityCritical]
        internal ColorTransformHandle()
            : base(true) 
        {
        } 
 
        /// 
        /// Use this constructor if the handle exists at construction time. 
        /// 
        /// 
        ///    Critical: The ctor of the base class requires SecurityPermission
        ///              This code calls SetHandle 
        /// 
        [SecurityCritical] 
        internal ColorTransformHandle(IntPtr profile) 
            : base(true)
        { 
            SetHandle(profile);
        }

        ///  
        /// Critical - calls unmanaged code, not treat as safe because you must
        ///            validate that handle is a valid color transform handle. 
        ///  
        [SecurityCritical]
        protected override bool ReleaseHandle() 
        {
            if (!UnsafeNativeMethods.Mscms.DeleteColorTransform(handle))
            {
                HRESULT.Check(Marshal.GetHRForLastWin32Error()); 
            }
 
            return true; 
        }
    } 

    #endregion

    #region ColorTransformHelper 

    ///  
    /// Class to call into MSCMS color transform APIs 
    /// 
    internal class ColorTransformHelper 
    {
        /// Constructor
        internal ColorTransformHelper()
        { 
        }
 
        /// Creates an ICM Profile Transform 
        /// Retrieves a standard color space profile
        ///  
        /// SecurityCritical: Calls unmanaged code, accepts SafeHandles as input.
        /// 
        [SecurityCritical]
        internal void CreateTransform(SafeProfileHandle sourceProfile, SafeProfileHandle destinationProfile) 
        {
            if (sourceProfile == null || sourceProfile.IsInvalid) 
            { 
                throw new ArgumentNullException("sourceProfile");
            } 

            if (destinationProfile == null || destinationProfile.IsInvalid)
            {
                throw new ArgumentNullException("destinationProfile"); 
            }
 
            IntPtr[] handles = new IntPtr[2]; 
            bool success = true;
 
            sourceProfile.DangerousAddRef(ref success);
            Debug.Assert(success);
            destinationProfile.DangerousAddRef(ref success);
            Debug.Assert(success); 

            try 
            { 
                handles[0] = sourceProfile.DangerousGetHandle();
                handles[1] = destinationProfile.DangerousGetHandle(); 

                UInt32[] dwIntents = new UInt32[2] {INTENT_PERCEPTUAL, INTENT_PERCEPTUAL};

                // No need to get rid of the old handle as it will get GC'ed 
                _transformHandle = UnsafeNativeMethods.Mscms.CreateMultiProfileTransform(
                    handles, 
                    (UInt32)handles.Length, 
                    dwIntents,
                    (UInt32)dwIntents.Length, 
                    BEST_MODE | USE_RELATIVE_COLORIMETRIC,
                    0
                    );
            } 
            finally
            { 
                sourceProfile.DangerousRelease(); 
                destinationProfile.DangerousRelease();
            } 

            if (_transformHandle == null || _transformHandle.IsInvalid)
            {
                HRESULT.Check(Marshal.GetHRForLastWin32Error()); 
            }
        } 
 
        /// Translates the colors
        /// Retrieves a standard color space profile 
        /// 
        /// SecurityCritical: Calls unmanaged code, accepts IntPtr/unverified data.
        /// 
        [SecurityCritical] 
        internal void TranslateColors(IntPtr paInputColors, UInt32 numColors, UInt32 inputColorType, IntPtr paOutputColors, UInt32 outputColorType)
        { 
            if (_transformHandle == null || _transformHandle.IsInvalid) 
            {
                throw new InvalidOperationException(SR.Get(SRID.Image_ColorTransformInvalid)); 
            }

            HRESULT.Check(UnsafeNativeMethods.Mscms.TranslateColors(
                _transformHandle, 
                paInputColors,
                numColors, 
                inputColorType, 
                paOutputColors,
                outputColorType)); 
        }


        #region Data members 

        /// Handle for the ICM Color Transform 
        private ColorTransformHandle _transformHandle; 

        /// Intents 
        private const UInt32 INTENT_PERCEPTUAL = 0;
        private const UInt32 INTENT_RELATIVE_COLORIMETRIC = 1;
        private const UInt32 INTENT_SATURATION = 2;
        private const UInt32 INTENT_ABSOLUTE_COLORIMETRIC = 3; 

        /// Flags for create color transform 
        private const UInt32 PROOF_MODE = 0x00000001; 
        private const UInt32 NORMAL_MODE = 0x00000002;
        private const UInt32 BEST_MODE = 0x00000003; 
        private const UInt32 ENABLE_GAMUT_CHECKING = 0x00010000;
        private const UInt32 USE_RELATIVE_COLORIMETRIC = 0x00020000;
        private const UInt32 FAST_TRANSLATE = 0x00040000;
 
        #endregion
    } 
 
    #endregion
} 



// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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