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//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation. All Rights Reserved.
//
// File: TransformedBitmap.cs
//
//------------------------------------------------------------------------------
using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Reflection;
using MS.Internal;
using MS.Win32.PresentationCore;
using System.Security;
using System.Security.Permissions;
using System.Diagnostics;
using System.Windows.Media;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Windows.Media.Animation;
using System.Windows.Media.Composition;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media.Imaging
{
#region TransformedBitmap
/// <summary>
/// TransformedBitmap provides caching functionality for a BitmapSource.
/// </summary>
public sealed partial class TransformedBitmap : Imaging.BitmapSource, ISupportInitialize
{
/// <summary>
/// TransformedBitmap construtor
/// </summary>
public TransformedBitmap()
: base(true) // Use base class virtuals
{
}
/// <summary>
/// Construct a TransformedBitmap with the given newTransform
/// </summary>
/// <param name="source">BitmapSource to apply to the newTransform to</param>
/// <param name="newTransform">Transform to apply to the bitmap</param>
public TransformedBitmap(BitmapSource source, Transform newTransform)
: base(true) // Use base class virtuals
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (newTransform == null)
{
throw new InvalidOperationException(SR.Get(SRID.Image_NoArgument, "Transform"));
}
if (!CheckTransform(newTransform))
{
throw new InvalidOperationException(SR.Get(SRID.Image_OnlyOrthogonal));
}
_bitmapInit.BeginInit();
Source = source;
Transform = newTransform;
_bitmapInit.EndInit();
FinalizeCreation();
}
// ISupportInitialize
/// <summary>
/// Prepare the bitmap to accept initialize paramters.
/// </summary>
public void BeginInit()
{
WritePreamble();
_bitmapInit.BeginInit();
}
/// <summary>
/// Prepare the bitmap to accept initialize paramters.
/// </summary>
/// <SecurityNote>
/// Critical - eventually accesses critical resources
/// PublicOK - All inputs verified
/// </SecurityNote>
[SecurityCritical ]
public void EndInit()
{
WritePreamble();
_bitmapInit.EndInit();
IsValidForFinalizeCreation(/* throwIfInvalid = */ true);
FinalizeCreation();
}
private void ClonePrequel(TransformedBitmap otherTransformedBitmap)
{
BeginInit();
}
private void ClonePostscript(TransformedBitmap otherTransformedBitmap)
{
EndInit();
}
/// <summary>
/// Check the transformation to see if it's a simple scale and/or rotation and/or flip.
/// </summary>
internal bool CheckTransform(Transform newTransform)
{
Matrix m = newTransform.Value;
bool canHandle = false;
if ( (DoubleUtil.IsZero(m.M11) && DoubleUtil.IsZero(m.M22)) ||
(DoubleUtil.IsZero(m.M12) && DoubleUtil.IsZero(m.M21)) )
{
canHandle = true;
}
return canHandle;
}
/// <summary>
/// Check the transformation to see if it's a simple scale and/or rotation and/or flip.
/// </summary>
internal void GetParamsFromTransform(
Transform newTransform,
out double scaleX,
out double scaleY,
out WICBitmapTransformOptions options)
{
Matrix m = newTransform.Value;
if (DoubleUtil.IsZero(m.M12) && DoubleUtil.IsZero(m.M21))
{
scaleX = Math.Abs(m.M11);
scaleY = Math.Abs(m.M22);
options = WICBitmapTransformOptions.WICBitmapTransformRotate0;
if (m.M11 < 0)
{
options |= WICBitmapTransformOptions.WICBitmapTransformFlipHorizontal;
}
if (m.M22 < 0)
{
options |= WICBitmapTransformOptions.WICBitmapTransformFlipVertical;
}
}
else
{
Debug.Assert(DoubleUtil.IsZero(m.M11) && DoubleUtil.IsZero(m.M22));
scaleX = Math.Abs(m.M12);
scaleY = Math.Abs(m.M21);
options = WICBitmapTransformOptions.WICBitmapTransformRotate90;
if (m.M12 < 0)
{
options |= WICBitmapTransformOptions.WICBitmapTransformFlipHorizontal;
}
if (m.M21 >= 0)
{
options |= WICBitmapTransformOptions.WICBitmapTransformFlipVertical;
}
}
}
///
/// Create the unmanaged resources
///
/// <SecurityNote>
/// Critical - access critical resource
/// </SecurityNote>
[SecurityCritical]
internal override void FinalizeCreation()
{
_bitmapInit.EnsureInitializedComplete();
BitmapSourceSafeMILHandle wicTransformer = null;
double scaleX, scaleY;
WICBitmapTransformOptions options;
GetParamsFromTransform(Transform, out scaleX, out scaleY, out options);
using (FactoryMaker factoryMaker = new FactoryMaker())
{
try
{
IntPtr wicFactory = factoryMaker.ImagingFactoryPtr;
wicTransformer = _source.WicSourceHandle;
if (!DoubleUtil.IsOne(scaleX) || !DoubleUtil.IsOne(scaleY))
{
uint width = Math.Max(1, (uint)(scaleX * _source.PixelWidth + 0.5));
uint height = Math.Max(1, (uint)(scaleY * _source.PixelHeight + 0.5));
HRESULT.Check(UnsafeNativeMethods.WICImagingFactory.CreateBitmapScaler(
wicFactory,
out wicTransformer));
lock (_syncObject)
{
HRESULT.Check(UnsafeNativeMethods.WICBitmapScaler.Initialize(
wicTransformer,
_source.WicSourceHandle,
width,
height,
WICInterpolationMode.Fant));
}
}
if (options != WICBitmapTransformOptions.WICBitmapTransformRotate0)
{
// Rotations are extremely slow if we're pulling from a decoder because we end
// up decoding multiple times. Caching the source lets us rotate faster at the cost
// of increased memory usage.
wicTransformer = CreateCachedBitmap(
null,
wicTransformer,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.Default,
_source.Palette);
// BitmapSource.CreateCachedBitmap already calculates memory pressure for
// the new bitmap, so there's no need to do it before setting it to
// WicSourceHandle.
BitmapSourceSafeMILHandle rotator = null;
HRESULT.Check(UnsafeNativeMethods.WICImagingFactory.CreateBitmapFlipRotator(
wicFactory,
out rotator));
lock (_syncObject)
{
HRESULT.Check(UnsafeNativeMethods.WICBitmapFlipRotator.Initialize(
rotator,
wicTransformer,
options));
}
wicTransformer = rotator;
}
// If we haven't introduced either a scaler or rotator, add a null rotator
// so that our WicSourceHandle isn't the same as our Source's.
if (options == WICBitmapTransformOptions.WICBitmapTransformRotate0 &&
DoubleUtil.IsOne(scaleX) && DoubleUtil.IsOne(scaleY))
{
HRESULT.Check(UnsafeNativeMethods.WICImagingFactory.CreateBitmapFlipRotator(
wicFactory,
out wicTransformer));
lock (_syncObject)
{
HRESULT.Check(UnsafeNativeMethods.WICBitmapFlipRotator.Initialize(
wicTransformer,
_source.WicSourceHandle,
WICBitmapTransformOptions.WICBitmapTransformRotate0));
}
}
WicSourceHandle = wicTransformer;
_isSourceCached = _source.IsSourceCached;
}
catch
{
_bitmapInit.Reset();
throw;
}
}
CreationCompleted = true;
UpdateCachedSettings();
}
/// <summary>
/// Notification on source changing.
/// </summary>
private void SourcePropertyChangedHook(DependencyPropertyChangedEventArgs e)
{
if (!e.IsASubPropertyChange)
{
BitmapSource newSource = e.NewValue as BitmapSource;
_source = newSource;
RegisterDownloadEventSource(_source);
_syncObject = (newSource != null) ? newSource.SyncObject : _bitmapInit;
}
}
internal override bool IsValidForFinalizeCreation(bool throwIfInvalid)
{
if (Source == null)
{
if (throwIfInvalid)
{
throw new InvalidOperationException(SR.Get(SRID.Image_NoArgument, "Source"));
}
return false;
}
Transform transform = Transform;
if (transform == null)
{
if (throwIfInvalid)
{
throw new InvalidOperationException(SR.Get(SRID.Image_NoArgument, "Transform"));
}
return false;
}
if (!CheckTransform(transform))
{
if (throwIfInvalid)
{
throw new InvalidOperationException(SR.Get(SRID.Image_OnlyOrthogonal));
}
return false;
}
return true;
}
/// <summary>
/// Notification on transform changing.
/// </summary>
private void TransformPropertyChangedHook(DependencyPropertyChangedEventArgs e)
{
if (!e.IsASubPropertyChange)
{
_transform = e.NewValue as Transform;
}
}
/// <summary>
/// Coerce Source
/// </summary>
private static object CoerceSource(DependencyObject d, object value)
{
TransformedBitmap bitmap = (TransformedBitmap)d;
if (!bitmap._bitmapInit.IsInInit)
{
return bitmap._source;
}
else
{
return value;
}
}
/// <summary>
/// Coerce Transform
/// </summary>
private static object CoerceTransform(DependencyObject d, object value)
{
TransformedBitmap bitmap = (TransformedBitmap)d;
if (!bitmap._bitmapInit.IsInInit)
{
return bitmap._transform;
}
else
{
return value;
}
}
#region Data Members
private BitmapSource _source;
private Transform _transform;
#endregion
}
#endregion // TransformedBitmap
}
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