Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Imaging / PngBitmapEncoder.cs / 1 / PngBitmapEncoder.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, All Rights Reserved // // File: PngBitmapEncoder.cs // //----------------------------------------------------------------------------- using System; using System.Security; using System.Security.Permissions; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using MS.Internal; using MS.Win32.PresentationCore; using System.Diagnostics; using System.Windows.Media; using System.Globalization; using System.Runtime.InteropServices; namespace System.Windows.Media.Imaging { #region PngInterlaceOption ////// Possibile options for the interlaced setting. /// public enum PngInterlaceOption : int { ////// Let the encoder decide what is best. /// Default = 0, ////// Save as an interlaced bitmap. /// On = 1, ////// Do not save as an interlaced bitmap. /// Off = 2, } #endregion #region PngBitmapEncoder ////// Built-in Encoder for Png files. /// public sealed class PngBitmapEncoder : BitmapEncoder { #region Constructors ////// Constructor for PngBitmapEncoder /// ////// Critical - will eventually create unmanaged resources /// PublicOK - all inputs are verified /// [SecurityCritical ] public PngBitmapEncoder() : base(true) { _supportsPreview = false; _supportsGlobalThumbnail = false; _supportsGlobalMetadata = false; _supportsFrameThumbnails = false; _supportsMultipleFrames = false; _supportsFrameMetadata = true; } #endregion #region Public Properties ////// Encode this bitmap as interlaced. /// public PngInterlaceOption Interlace { get { return _interlaceOption; } set { _interlaceOption = value; } } #endregion #region Internal Properties / Methods ////// Returns the container format for this encoder /// ////// Critical - uses guid to create unmanaged resources /// internal override Guid ContainerFormat { [SecurityCritical] get { return _containerFormat; } } ////// Setups the encoder and other properties before encoding each frame /// ////// Critical - calls Critical Initialize() /// [SecurityCritical] internal override void SetupFrame(SafeMILHandle frameEncodeHandle, SafeMILHandle encoderOptions) { PROPBAG2 propBag = new PROPBAG2(); PROPVARIANT propValue = new PROPVARIANT(); // There is only one encoder option supported here: if (_interlaceOption != c_defaultInterlaceOption) { try { propBag.Init("InterlaceOption"); propValue.Init(_interlaceOption == PngInterlaceOption.On); HRESULT.Check(UnsafeNativeMethods.IPropertyBag2.Write( encoderOptions, 1, ref propBag, ref propValue)); } finally { propBag.Clear(); propValue.Clear(); } } HRESULT.Check(UnsafeNativeMethods.WICBitmapFrameEncode.Initialize( frameEncodeHandle, encoderOptions )); } #endregion #region Internal Abstract /// Need to implement this to derive from the "sealed" object internal override void SealObject() { throw new NotImplementedException(); } #endregion #region Data Members ////// Critical - CLSID used for creation of critical resources /// [SecurityCritical] private Guid _containerFormat = MILGuidData.GUID_ContainerFormatPng; private const PngInterlaceOption c_defaultInterlaceOption = PngInterlaceOption.Default; private PngInterlaceOption _interlaceOption = c_defaultInterlaceOption; #endregion } #endregion // PngBitmapEncoder } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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