Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / TileBrush.cs / 1305600 / TileBrush.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: TileBrush.cs // // Description: This file contains the implementation of TileBrush. // The TileBrush is an abstract class of Brushes which describes // a way to fill a region by tiling. The contents of the tiles // are described by classes derived from TileBrush. // // History: // 04/29/2003 : [....] - Created it. // //--------------------------------------------------------------------------- using System; using System.ComponentModel; using System.Diagnostics; using System.Security; using System.Windows; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Media.Composition; using MS.Internal; using System.Runtime.InteropServices; namespace System.Windows.Media { ////// TileBrush /// The TileBrush is an abstract class of Brushes which describes /// a way to fill a region by tiling. The contents of the tiles /// are described by classes derived from TileBrush. /// public abstract partial class TileBrush : Brush { #region Constructors ////// Protected constructor for TileBrush. /// Sets all values to their defaults. /// To set property values, use the constructor which accepts paramters /// protected TileBrush() { } #endregion Constructors ////// Obtains the current bounds of the brush's content /// /// Output bounds of content protected abstract void GetContentBounds(out Rect contentBounds); ////// Obtains a matrix that maps the TileBrush's content to the coordinate /// space of the shape it is filling. /// /// /// Fill-bounds of the shape this brush is stroking/filling /// /// /// Output matrix that maps the TileBrush's content to the coordinate /// space of the shape it is filling /// ////// Critical as this code calls UnsafeNativeMethods.MilUtility_GetTileBrushMapping /// and MILUtilities.ConvertFromD3DMATRIX. /// Treat as safe because the first is simply a math utility function with no /// critical data exposure, and the second is passed pointers to type-correct data. /// [SecurityCritical,SecurityTreatAsSafe] internal void GetTileBrushMapping( Rect shapeFillBounds, out Matrix tileBrushMapping ) { Rect contentBounds = Rect.Empty; BrushMappingMode viewboxUnits = ViewboxUnits; bool brushIsEmpty = false; // Initialize out-param tileBrushMapping = Matrix.Identity; // Obtain content bounds for RelativeToBoundingBox ViewboxUnits // // If ViewboxUnits is RelativeToBoundingBox, then the tile-brush // transform is also dependent on the bounds of the content. if (viewboxUnits == BrushMappingMode.RelativeToBoundingBox) { GetContentBounds(out contentBounds); // If contentBounds is Rect.Empty then this brush renders nothing. // Set the empty flag & early-out. if (contentBounds == Rect.Empty) { brushIsEmpty = true; } } // // Pass the properties to MilUtility_GetTileBrushMapping to calculate // the mapping, unless the brush is already determined to be empty // if (!brushIsEmpty) { // // Obtain properties that must be set into local variables // Rect viewport = Viewport; Rect viewbox = Viewbox; Matrix transformValue; Matrix relativeTransformValue; Transform.GetTransformValue( Transform, out transformValue ); Transform.GetTransformValue( RelativeTransform, out relativeTransformValue ); unsafe { D3DMATRIX d3dTransform; D3DMATRIX d3dRelativeTransform; D3DMATRIX d3dContentToShape; int brushIsEmptyBOOL; // Call MilUtility_GetTileBrushMapping, converting Matrix's to // D3DMATRIX's when needed. MILUtilities.ConvertToD3DMATRIX(&transformValue, &d3dTransform); MILUtilities.ConvertToD3DMATRIX(&relativeTransformValue, &d3dRelativeTransform); MS.Win32.PresentationCore.UnsafeNativeMethods.MilCoreApi.MilUtility_GetTileBrushMapping( &d3dTransform, &d3dRelativeTransform, Stretch, AlignmentX, AlignmentY, ViewportUnits, viewboxUnits, &shapeFillBounds, &contentBounds, ref viewport, ref viewbox, out d3dContentToShape, out brushIsEmptyBOOL ); // Convert the brushIsEmpty flag from BOOL to a bool. brushIsEmpty = (brushIsEmptyBOOL != 0); // Set output matrix if the brush isn't empty. Otherwise, the // output of MilUtility_GetTileBrushMapping must be ignored. if (!brushIsEmpty) { Matrix contentToShape; MILUtilities.ConvertFromD3DMATRIX(&d3dContentToShape, &contentToShape); // Set the out-param to the computed tile brush mapping tileBrushMapping = contentToShape; } } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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