TileBrush.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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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