GlyphCache.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / GlyphCache.cs / 2 / GlyphCache.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
//--------------------------------------------------------------------------- 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Diagnostics;
using System.Security;
using System.Text; 
using System.Windows;
using System.Windows.Media; 
using System.Windows.Media.Composition; 
using System.Runtime.InteropServices;
using MS.Internal; 
using MS.Internal.FontCache;

using SR = MS.Internal.PresentationCore.SR;
using SRID = MS.Internal.PresentationCore.SRID; 
using UnsafeNativeMethods = MS.Win32.PresentationCore.UnsafeNativeMethods;
 
namespace System.Windows.Media 
{
    ///  
    /// Master Glyph Cache class
    /// 
    internal class GlyphCache
    { 
        /// 
        /// Callback delegate. 
        ///  
        public delegate int CreateGlyphsCallbackDelegate(
            IntPtr /*CMilSlaveGlyphCache | CMilSlaveGlyphRun* */ nativeObject, 
            IntPtr /*GLYPH_BITMAP_CREATE_REQUEST | GLYPH_GEOMETRY_CREATE_REQUEST* */ request,
            ushort       isGeometryRequest);

        private DUCE.Resource _duceResource = new DUCE.Resource(); 
        private SafeReversePInvokeWrapper _reversePInvokeWrapper;
 
        internal DUCE.ResourceHandle Handle 
        {
            get 
            {
                return _duceResource.Handle;
            }
        } 

 
        // Service channel that serves for both 
        // pre-commit and post-commit actions
        internal DUCE.Channel _channel; 

        internal void RemoveFromChannel()
        {
            if (_channel != null) 
            {
                _duceResource.ReleaseOnChannel(_channel); 
            } 
        }
 
        /// 
        ///
        /// 
        ///  
        /// 
        /// Critical - calls critical code 
        ///  
        [SecurityCritical]
        internal GlyphCache(DUCE.Channel channel) 
        {
            _channel = channel;

            Debug.Assert(_channel != null); 
            _duceResource.CreateOrAddRefOnChannel(_channel, DUCE.ResourceType.TYPE_GLYPHCACHE);
            SendCallbackEntryPoint(); 
        } 

        ///  
        /// Sends a callback pointer to this glyphcache for glyph generation requests.
        /// 
        /// 
        /// Critical - This code sends a pointer to unmanaged code 
        /// 
        [SecurityCritical] 
        private unsafe void SendCallbackEntryPoint() 
        {
            _createGlyphBitmapsCallbackDelegate = new CreateGlyphsCallbackDelegate(FontCacheAccessor.CreateGlyphsCallback); 

            IntPtr fcn = Marshal.GetFunctionPointerForDelegate(_createGlyphBitmapsCallbackDelegate);
            _reversePInvokeWrapper = new SafeReversePInvokeWrapper(fcn);
 
            DUCE.MILCMD_GLYPHCACHE_SETCALLBACK cmd;
            cmd.Type = MILCMD.MilCmdGlyphCacheSetCallback; 
            cmd.Handle = Handle; 

            // AddRef the reverse p-invoke wrapper while it is being transferred across the channel. There is a 
            // small chance we would leak the wrapper. More specifically, if the app domain is shut down before
            // the wrapper is picked up by the composition engine.
            UnsafeNativeMethods.MILUnknown.AddRef(_reversePInvokeWrapper);
            cmd.CallbackPointer = (UInt64)_reversePInvokeWrapper.DangerousGetHandle(); 

            _channel.SendSecurityCriticalCommand((byte*)&cmd, sizeof(DUCE.MILCMD_GLYPHCACHE_SETCALLBACK)); 
        } 

        private CreateGlyphsCallbackDelegate _createGlyphBitmapsCallbackDelegate; 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
//--------------------------------------------------------------------------- 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Diagnostics;
using System.Security;
using System.Text; 
using System.Windows;
using System.Windows.Media; 
using System.Windows.Media.Composition; 
using System.Runtime.InteropServices;
using MS.Internal; 
using MS.Internal.FontCache;

using SR = MS.Internal.PresentationCore.SR;
using SRID = MS.Internal.PresentationCore.SRID; 
using UnsafeNativeMethods = MS.Win32.PresentationCore.UnsafeNativeMethods;
 
namespace System.Windows.Media 
{
    ///  
    /// Master Glyph Cache class
    /// 
    internal class GlyphCache
    { 
        /// 
        /// Callback delegate. 
        ///  
        public delegate int CreateGlyphsCallbackDelegate(
            IntPtr /*CMilSlaveGlyphCache | CMilSlaveGlyphRun* */ nativeObject, 
            IntPtr /*GLYPH_BITMAP_CREATE_REQUEST | GLYPH_GEOMETRY_CREATE_REQUEST* */ request,
            ushort       isGeometryRequest);

        private DUCE.Resource _duceResource = new DUCE.Resource(); 
        private SafeReversePInvokeWrapper _reversePInvokeWrapper;
 
        internal DUCE.ResourceHandle Handle 
        {
            get 
            {
                return _duceResource.Handle;
            }
        } 

 
        // Service channel that serves for both 
        // pre-commit and post-commit actions
        internal DUCE.Channel _channel; 

        internal void RemoveFromChannel()
        {
            if (_channel != null) 
            {
                _duceResource.ReleaseOnChannel(_channel); 
            } 
        }
 
        /// 
        ///
        /// 
        ///  
        /// 
        /// Critical - calls critical code 
        ///  
        [SecurityCritical]
        internal GlyphCache(DUCE.Channel channel) 
        {
            _channel = channel;

            Debug.Assert(_channel != null); 
            _duceResource.CreateOrAddRefOnChannel(_channel, DUCE.ResourceType.TYPE_GLYPHCACHE);
            SendCallbackEntryPoint(); 
        } 

        ///  
        /// Sends a callback pointer to this glyphcache for glyph generation requests.
        /// 
        /// 
        /// Critical - This code sends a pointer to unmanaged code 
        /// 
        [SecurityCritical] 
        private unsafe void SendCallbackEntryPoint() 
        {
            _createGlyphBitmapsCallbackDelegate = new CreateGlyphsCallbackDelegate(FontCacheAccessor.CreateGlyphsCallback); 

            IntPtr fcn = Marshal.GetFunctionPointerForDelegate(_createGlyphBitmapsCallbackDelegate);
            _reversePInvokeWrapper = new SafeReversePInvokeWrapper(fcn);
 
            DUCE.MILCMD_GLYPHCACHE_SETCALLBACK cmd;
            cmd.Type = MILCMD.MilCmdGlyphCacheSetCallback; 
            cmd.Handle = Handle; 

            // AddRef the reverse p-invoke wrapper while it is being transferred across the channel. There is a 
            // small chance we would leak the wrapper. More specifically, if the app domain is shut down before
            // the wrapper is picked up by the composition engine.
            UnsafeNativeMethods.MILUnknown.AddRef(_reversePInvokeWrapper);
            cmd.CallbackPointer = (UInt64)_reversePInvokeWrapper.DangerousGetHandle(); 

            _channel.SendSecurityCriticalCommand((byte*)&cmd, sizeof(DUCE.MILCMD_GLYPHCACHE_SETCALLBACK)); 
        } 

        private CreateGlyphsCallbackDelegate _createGlyphBitmapsCallbackDelegate; 
    }
}

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