Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Imaging / BitmapSizeOptions.cs / 1 / BitmapSizeOptions.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, All rights reserved. // // File: BitmapSizeOptions.cs // //----------------------------------------------------------------------------- using System; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using MS.Internal; using System.Diagnostics; using System.Windows.Media; using System.Globalization; using System.Runtime.InteropServices; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Media.Imaging { #region BitmapSizeOptions ////// Sizing options for an bitmap. The resulting bitmap /// will be scaled based on these options. /// public class BitmapSizeOptions { ////// Construct an BitmapSizeOptions object. Still need to set the Width and Height Properties. /// private BitmapSizeOptions() { } ////// Whether or not to preserve the aspect ratio of the original /// bitmap. If so, then the PixelWidth and PixelHeight are /// maximum values for the bitmap size. The resulting bitmap /// is only guaranteed to have either its width or its height /// match the specified values. For example, if you want to /// specify the height, while preserving the aspect ratio for /// the width, then set the height to the desired value, and /// set the width to Int32.MaxValue. /// /// If we are not to preserve aspect ratio, then both the /// specified width and the specified height are used, and /// the bitmap will be stretched to fit both those values. /// public bool PreservesAspectRatio { get { return _preservesAspectRatio; } } ////// PixelWidth of the resulting bitmap. See description of /// PreserveAspectRatio for how this value is used. /// /// PixelWidth must be set to a value greater than zero to be valid. /// public int PixelWidth { get { return _pixelWidth; } } ////// PixelHeight of the resulting bitmap. See description of /// PreserveAspectRatio for how this value is used. /// /// PixelHeight must be set to a value greater than zero to be valid. /// public int PixelHeight { get { return _pixelHeight; } } ////// Rotation to rotate the bitmap. Only multiples of 90 are supported. /// public Rotation Rotation { get { return _rotationAngle; } } ////// Constructs an identity BitmapSizeOptions (when passed to a TransformedBitmap, the /// input is the same as the output). /// public static BitmapSizeOptions FromEmptyOptions() { BitmapSizeOptions sizeOptions = new BitmapSizeOptions(); sizeOptions._rotationAngle = Rotation.Rotate0; sizeOptions._preservesAspectRatio = true; sizeOptions._pixelHeight = 0; sizeOptions._pixelWidth = 0; return sizeOptions; } ////// Constructs an BitmapSizeOptions that preserves the aspect ratio and enforces a height of pixelHeight. /// /// Height of the resulting Bitmap public static BitmapSizeOptions FromHeight(int pixelHeight) { if (pixelHeight <= 0) { throw new System.ArgumentOutOfRangeException("pixelHeight", SR.Get(SRID.ParameterMustBeGreaterThanZero)); } BitmapSizeOptions sizeOptions = new BitmapSizeOptions(); sizeOptions._rotationAngle = Rotation.Rotate0; sizeOptions._preservesAspectRatio = true; sizeOptions._pixelHeight = pixelHeight; sizeOptions._pixelWidth = 0; return sizeOptions; } ////// Constructs an BitmapSizeOptions that preserves the aspect ratio and enforces a width of pixelWidth. /// /// Width of the resulting Bitmap public static BitmapSizeOptions FromWidth(int pixelWidth) { if (pixelWidth <= 0) { throw new System.ArgumentOutOfRangeException("pixelWidth", SR.Get(SRID.ParameterMustBeGreaterThanZero)); } BitmapSizeOptions sizeOptions = new BitmapSizeOptions(); sizeOptions._rotationAngle = Rotation.Rotate0; sizeOptions._preservesAspectRatio = true; sizeOptions._pixelWidth = pixelWidth; sizeOptions._pixelHeight = 0; return sizeOptions; } ////// Constructs an BitmapSizeOptions that does not preserve the aspect ratio and /// instead uses dimensions pixelWidth x pixelHeight. /// /// Width of the resulting Bitmap /// Height of the resulting Bitmap public static BitmapSizeOptions FromWidthAndHeight(int pixelWidth, int pixelHeight) { if (pixelWidth <= 0) { throw new System.ArgumentOutOfRangeException("pixelWidth", SR.Get(SRID.ParameterMustBeGreaterThanZero)); } if (pixelHeight <= 0) { throw new System.ArgumentOutOfRangeException("pixelHeight", SR.Get(SRID.ParameterMustBeGreaterThanZero)); } BitmapSizeOptions sizeOptions = new BitmapSizeOptions(); sizeOptions._rotationAngle = Rotation.Rotate0; sizeOptions._preservesAspectRatio = false; sizeOptions._pixelWidth = pixelWidth; sizeOptions._pixelHeight = pixelHeight; return sizeOptions; } ////// Constructs an BitmapSizeOptions that does not preserve the aspect ratio and /// instead uses dimensions pixelWidth x pixelHeight. /// /// Angle to rotate public static BitmapSizeOptions FromRotation(Rotation rotation) { switch(rotation) { case Rotation.Rotate0: case Rotation.Rotate90: case Rotation.Rotate180: case Rotation.Rotate270: break; default: throw new ArgumentException(SR.Get(SRID.Image_SizeOptionsAngle), "rotationAngle"); } BitmapSizeOptions sizeOptions = new BitmapSizeOptions(); sizeOptions._rotationAngle = rotation; sizeOptions._preservesAspectRatio = true; sizeOptions._pixelWidth = 0; sizeOptions._pixelHeight = 0; return sizeOptions; } // Note: In this method, newWidth, newHeight are not affected by the // rotation angle. internal void GetScaledWidthAndHeight( uint width, uint height, out uint newWidth, out uint newHeight) { if (_pixelWidth == 0 && _pixelHeight != 0) { Debug.Assert(_preservesAspectRatio == true); newWidth = (uint)((_pixelHeight * width)/height); newHeight = (uint)_pixelHeight; } else if (_pixelWidth != 0 && _pixelHeight == 0) { Debug.Assert(_preservesAspectRatio == true); newWidth = (uint)_pixelWidth; newHeight = (uint)((_pixelWidth * height)/width); } else if (_pixelWidth != 0 && _pixelHeight != 0) { Debug.Assert(_preservesAspectRatio == false); newWidth = (uint)_pixelWidth; newHeight = (uint)_pixelHeight; } else { newWidth = width; newHeight = height; } } internal bool DoesScale { get { return (_pixelWidth != 0 || _pixelHeight != 0); } } internal WICBitmapTransformOptions WICTransformOptions { get { WICBitmapTransformOptions options = 0; switch (_rotationAngle) { case Rotation.Rotate0: options = WICBitmapTransformOptions.WICBitmapTransformRotate0; break; case Rotation.Rotate90: options = WICBitmapTransformOptions.WICBitmapTransformRotate90; break; case Rotation.Rotate180: options = WICBitmapTransformOptions.WICBitmapTransformRotate180; break; case Rotation.Rotate270: options = WICBitmapTransformOptions.WICBitmapTransformRotate270; break; default: Debug.Assert(false); break; } return options; } } private bool _preservesAspectRatio; private int _pixelWidth; private int _pixelHeight; private Rotation _rotationAngle; } #endregion // BitmapSizeOptions } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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