Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Imaging / JpegBitmapEncoder.cs / 1 / JpegBitmapEncoder.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, All Rights Reserved // // File: JpegBitmapEncoder.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; using System.Windows.Media.Imaging; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Media.Imaging { #region JpegBitmapEncoder ////// Built-in Encoder for Jpeg files. /// public sealed class JpegBitmapEncoder : BitmapEncoder { #region Constructors ////// Constructor for JpegBitmapEncoder /// ////// Critical - will eventually create unmanaged resources /// PublicOK - all inputs are verified /// [SecurityCritical ] public JpegBitmapEncoder() : base(true) { _supportsPreview = false; _supportsGlobalThumbnail = false; _supportsGlobalMetadata = false; _supportsFrameThumbnails = true; _supportsMultipleFrames = false; _supportsFrameMetadata = true; } #endregion #region Public Properties ////// Set the quality level for the encoding. /// The quality level must be between 1-100, inclusive. /// This property is mutually exclusive with doing lossless encoding. /// public int QualityLevel { get { return _qualityLevel; } set { if ((value < 1) || (value > 100)) { throw new System.ArgumentOutOfRangeException("value", SR.Get(SRID.ParameterMustBeBetween, 1, 100)); } _qualityLevel = value; } } ////// Set a lossless rotation value of Rotation degrees. /// This replaces any previous lossless transformation. /// public Rotation Rotation { get { if (Rotate90) { return Rotation.Rotate90; } else if (Rotate180) { return Rotation.Rotate180; } else if (Rotate270) { return Rotation.Rotate270; } else { return Rotation.Rotate0; } } set { Rotate90 = false; Rotate180 = false; Rotate270 = false; switch(value) { case(Rotation.Rotate0): // do nothing, we reset everything above // case statement is here for clearness break; case(Rotation.Rotate90): Rotate90 = true; break; case(Rotation.Rotate180): Rotate180 = true; break; case(Rotation.Rotate270): Rotate270 = true; break; } } } ////// Set a lossless horizontal flip. /// This replaces any previous lossless transformation. /// public bool FlipHorizontal { get { return (Convert.ToBoolean((int)_transformation & (int)WICBitmapTransformOptions.WICBitmapTransformFlipHorizontal)); } set { if (value != this.FlipHorizontal) { if (value) { _transformation |= WICBitmapTransformOptions.WICBitmapTransformFlipHorizontal; } else { _transformation &= ~WICBitmapTransformOptions.WICBitmapTransformFlipHorizontal; } } } } ////// Set a lossless vertical flip. /// This replaces any previous lossless transformation. /// public bool FlipVertical { get { return (Convert.ToBoolean((int)_transformation & (int)WICBitmapTransformOptions.WICBitmapTransformFlipVertical)); } set { if (value != this.FlipVertical) { if (value) { _transformation |= WICBitmapTransformOptions.WICBitmapTransformFlipVertical; } else { _transformation &= ~WICBitmapTransformOptions.WICBitmapTransformFlipVertical; } } } } #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 are only two encoder options supported here: if (_transformation != c_defaultTransformation) { try { propBag.Init("BitmapTransform"); propValue.Init((byte) _transformation); HRESULT.Check(UnsafeNativeMethods.IPropertyBag2.Write( encoderOptions, 1, ref propBag, ref propValue)); } finally { propBag.Clear(); propValue.Clear(); } } if (_qualityLevel != c_defaultQualityLevel) { try { propBag.Init("ImageQuality"); propValue.Init( ((float)_qualityLevel) / 100.0f); HRESULT.Check(UnsafeNativeMethods.IPropertyBag2.Write( encoderOptions, 1, ref propBag, ref propValue)); } finally { propBag.Clear(); propValue.Clear(); } } HRESULT.Check(UnsafeNativeMethods.WICBitmapFrameEncode.Initialize( frameEncodeHandle, encoderOptions )); } ////// Set a lossless rotation value of 90 degrees. /// This replaces any previous lossless transformation. /// We can coexist with Flip operation /// private bool Rotate90 { get { return ((Convert.ToBoolean((int)_transformation & (int)WICBitmapTransformOptions.WICBitmapTransformRotate90) && (!Rotate270))); } set { if (value != this.Rotate90) { bool IsFlipH = FlipHorizontal; bool IsFlipV = FlipVertical; if (value) { _transformation = WICBitmapTransformOptions.WICBitmapTransformRotate90; } else { _transformation = WICBitmapTransformOptions.WICBitmapTransformRotate0; } FlipHorizontal = IsFlipH; FlipVertical = IsFlipV; } } } ////// Set a lossless rotation value of 180 degrees. /// This replaces any previous lossless transformation. /// We can coexist with Flip operation /// private bool Rotate180 { get { return ((Convert.ToBoolean((int)_transformation & (int)WICBitmapTransformOptions.WICBitmapTransformRotate180) && (!Rotate270))); } set { if (value != this.Rotate180) { bool IsFlipH = FlipHorizontal; bool IsFlipV = FlipVertical; if (value) { _transformation = WICBitmapTransformOptions.WICBitmapTransformRotate180; } else { _transformation = WICBitmapTransformOptions.WICBitmapTransformRotate0; } FlipHorizontal = IsFlipH; FlipVertical = IsFlipV; } } } ////// Set a lossless rotation value of 270 degrees. /// This replaces any previous lossless transformation. /// We can coexist with Flip operation /// private bool Rotate270 { get { return (Convert.ToBoolean(((int)_transformation & (int)WICBitmapTransformOptions.WICBitmapTransformRotate270) == (int)WICBitmapTransformOptions.WICBitmapTransformRotate270)); } set { if (value != this.Rotate270) { bool IsFlipH = FlipHorizontal; bool IsFlipV = FlipVertical; if (value) { _transformation = WICBitmapTransformOptions.WICBitmapTransformRotate270; } else { _transformation = WICBitmapTransformOptions.WICBitmapTransformRotate0; } FlipHorizontal = IsFlipH; FlipVertical = IsFlipV; } } } #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_ContainerFormatJpeg; // This happens to be the default used by the jpeg lib. private const int c_defaultQualityLevel = 75; private int _qualityLevel = c_defaultQualityLevel; private const WICBitmapTransformOptions c_defaultTransformation = WICBitmapTransformOptions.WICBitmapTransformRotate0; private WICBitmapTransformOptions _transformation = c_defaultTransformation; #endregion } #endregion // JpegBitmapEncoder } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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