/// <summary>
/// WalkContent - method which walks the content (if present) and calls out to the
/// supplied DrawingContextWalker.
/// </summary>
/// <param name="walker">
/// DrawingContextWalker - the target of the calls which occur during
/// the content walk.
/// </param>
internal void WalkContent(DrawingContextWalker walker)
{
VerifyAPIReadOnly();
if (_content != null)
{
_content.WalkContent(walker);
}
}
/// <summary>
/// Calls methods on the DrawingContext that are equivalent to the
/// Drawing with the Drawing's current value.
/// </summary>
internal override void WalkCurrentValue(DrawingContextWalker ctx)
{
// We avoid unneccessary ShouldStopWalking checks based on assumptions
// about when ShouldStopWalking is set. Guard that assumption with an
// assertion. See DrawingGroup.WalkCurrentValue comment for more details.
ctx.DrawImage(
ImageSource,
Rect
);
}
/// <summary>
/// Calls methods on the DrawingContext that are equivalent to the
/// Drawing with the Drawing's current value.
/// </summary>
internal override void WalkCurrentValue(DrawingContextWalker ctx)
{
// We avoid unneccessary ShouldStopWalking checks based on assumptions
// about when ShouldStopWalking is set. Guard that assumption with an
// assertion. See DrawingGroup.WalkCurrentValue comment for more details.
ctx.DrawImage(
ImageSource,
Rect
);
}
/// <summary>
/// Calls methods on the DrawingContext that are equivalent to the
/// Drawing with the Drawing's current value.
/// </summary>
internal override void WalkCurrentValue(DrawingContextWalker ctx)
{
// We avoid unneccessary ShouldStopWalking checks based on assumptions
// about when ShouldStopWalking is set. Guard that assumption with an
// assertion. See DrawingGroup.WalkCurrentValue comment for more details.
Debug.Assert(!ctx.ShouldStopWalking);
ctx.DrawVideo(
Player,
Rect
);
}
/// <summary>
/// Calls methods on the DrawingContext that are equivalent to the
/// Drawing with the Drawing's current value.
/// </summary>
internal override void WalkCurrentValue(DrawingContextWalker ctx)
{
// We avoid unneccessary ShouldStopWalking checks based on assumptions
// about when ShouldStopWalking is set. Guard that assumption with an
// assertion. See DrawingGroup.WalkCurrentValue comment for more details.
Debug.Assert(!ctx.ShouldStopWalking);
ctx.DrawGlyphRun(
ForegroundBrush,
GlyphRun
);
}
/// <summary>
/// Calls methods on the DrawingContext that are equivalent to the
/// Drawing with the Drawing's current value.
/// </summary>
internal override void WalkCurrentValue(DrawingContextWalker ctx)
{
int popCount = 0;
// We avoid unneccessary ShouldStopWalking checks based on assumptions
// about when ShouldStopWalking is set. Guard that assumption with an
// assertion.
//
// ShouldStopWalking is currently only set during a hit-test walk after
// an object has been hit. Because a DrawingGroup can't be hit until after
// the first Drawing is tested, this method doesn't check ShouldStopWalking
// until after the first child.
//
// We don't need to add this check to other Drawing subclasses for
// the same reason -- if the Drawing being tested isn't a DrawingGroup,
// they are always the 'first child'.
//
// If this assumption is ever broken then the ShouldStopWalking
// check should be done on the first child -- including in the
// WalkCurrentValue method of other Drawing subclasses.
Debug.Assert(!ctx.ShouldStopWalking);
//
// Draw the transform property
//
// Avoid calling PushTransform if the base value is set to the default and
// no animations have been set on the property.
if (!IsBaseValueDefault(DrawingGroup.TransformProperty) ||
(null != AnimationStorage.GetStorage(this, DrawingGroup.TransformProperty)))
{
ctx.PushTransform(Transform);
popCount++;
}
//
// Draw the clip property
//
// Avoid calling PushClip if the base value is set to the default and
// no animations have been set on the property.
if (!IsBaseValueDefault(DrawingGroup.ClipGeometryProperty) ||
(null != AnimationStorage.GetStorage(this, DrawingGroup.ClipGeometryProperty)))
{
ctx.PushClip(ClipGeometry);
popCount++;
}
//
// Draw the opacity property
//
// Avoid calling PushOpacity if the base value is set to the default and
// no animations have been set on the property.
if (!IsBaseValueDefault(DrawingGroup.OpacityProperty) ||
(null != AnimationStorage.GetStorage(this, DrawingGroup.OpacityProperty)))
{
// Push the current value of the opacity property, which
// is what Opacity returns.
ctx.PushOpacity(Opacity);
popCount++;
}
// Draw the opacity mask property
//
if (OpacityMask != null)
{
ctx.PushOpacityMask(OpacityMask);
popCount++;
}
//
// Draw the effect property
//
// Push the current value of the effect property, which
// is what BitmapEffect returns.
if (BitmapEffect != null)
{
// Disable warning about obsolete method. This code must remain active
// until we can remove the public BitmapEffect APIs.
#pragma warning disable 0618
ctx.PushEffect(BitmapEffect, BitmapEffectInput);
#pragma warning restore 0618
popCount++;
}
//
// Draw the Children collection
//
// Get the current value of the children collection
DrawingCollection collection = Children;
// Call Walk on each child
if (collection != null)
{
for (int i = 0; i < collection.Count; i++)
{
Drawing drawing = collection.Internal_GetItem(i);
if (drawing != null)
{
drawing.WalkCurrentValue(ctx);
// Don't visit the remaining children if the previous
// child caused us to stop walking.
if (ctx.ShouldStopWalking)
{
break;
}
}
}
}
//
// Call Pop() for every Push
//
// Avoid placing this logic in a finally block because if an exception is
// thrown, the Walk is simply aborted. There is no requirement to Walk
// through Pop instructions when an exception is thrown.
//
for (int i = 0; i < popCount; i++)
{
ctx.Pop();
}
}
/// <summary>
/// Forward the current value of the content to the DrawingContextWalker
/// methods.
/// </summary>
/// <param name="walker"> DrawingContextWalker to forward content to. </param>
public void WalkContent(DrawingContextWalker walker)
{
DrawingContextWalk(walker);
}
public void BaseValueDrawingContextWalk(DrawingContextWalker ctx)
{
// We shouldn't have any dependent resources if _curOffset is 0
// (_curOffset == 0) -> (renderData._dependentResources.Count == 0)
Debug.Assert((_curOffset > 0) || (_dependentResources.Count == 0));
// The buffer being null implies that _curOffset must be 0.
// (_buffer == null) -> (_curOffset == 0)
Debug.Assert((_buffer != null) || (_curOffset == 0));
// The _curOffset must be less than the length, if there is a buffer.
Debug.Assert((_buffer == null) || (_curOffset <= _buffer.Length));
if (_curOffset > 0)
{
unsafe
{
fixed (byte* pByte = this._buffer)
{
// This pointer points to the current read point in the
// instruction stream.
byte* pCur = pByte;
// This points to the first byte past the end of the
// instruction stream (i.e. when to stop)
byte* pEndOfInstructions = pByte + _curOffset;
// Iterate across the entire list of instructions, stopping at the
// end or when the DrawingContextWalker has signalled a stop.
while ((pCur < pEndOfInstructions) && !ctx.ShouldStopWalking)
{
RecordHeader* pCurRecord = (RecordHeader*)pCur;
switch (pCurRecord->Id)
{
case MILCMD.MilDrawLine:
{
MILCMD_DRAW_LINE* data = (MILCMD_DRAW_LINE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawLine(
(Pen)DependentLookup(data->hPen),
data->point0,
data->point1
);
}
break;
case MILCMD.MilDrawLineAnimate:
{
MILCMD_DRAW_LINE_ANIMATE* data = (MILCMD_DRAW_LINE_ANIMATE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawLine(
(Pen)DependentLookup(data->hPen),
data->point0,
((PointAnimationClockResource)DependentLookup(data->hPoint0Animations)).AnimationClock,
data->point1,
((PointAnimationClockResource)DependentLookup(data->hPoint1Animations)).AnimationClock
);
}
break;
case MILCMD.MilDrawRectangle:
{
MILCMD_DRAW_RECTANGLE* data = (MILCMD_DRAW_RECTANGLE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawRectangle(
(Brush)DependentLookup(data->hBrush),
(Pen)DependentLookup(data->hPen),
data->rectangle
);
}
break;
case MILCMD.MilDrawRectangleAnimate:
{
MILCMD_DRAW_RECTANGLE_ANIMATE* data = (MILCMD_DRAW_RECTANGLE_ANIMATE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawRectangle(
(Brush)DependentLookup(data->hBrush),
(Pen)DependentLookup(data->hPen),
data->rectangle,
((RectAnimationClockResource)DependentLookup(data->hRectangleAnimations)).AnimationClock
);
}
break;
case MILCMD.MilDrawRoundedRectangle:
{
MILCMD_DRAW_ROUNDED_RECTANGLE* data = (MILCMD_DRAW_ROUNDED_RECTANGLE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawRoundedRectangle(
(Brush)DependentLookup(data->hBrush),
(Pen)DependentLookup(data->hPen),
data->rectangle,
data->radiusX,
data->radiusY
);
}
break;
case MILCMD.MilDrawRoundedRectangleAnimate:
{
MILCMD_DRAW_ROUNDED_RECTANGLE_ANIMATE* data = (MILCMD_DRAW_ROUNDED_RECTANGLE_ANIMATE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawRoundedRectangle(
(Brush)DependentLookup(data->hBrush),
(Pen)DependentLookup(data->hPen),
data->rectangle,
((RectAnimationClockResource)DependentLookup(data->hRectangleAnimations)).AnimationClock,
data->radiusX,
((DoubleAnimationClockResource)DependentLookup(data->hRadiusXAnimations)).AnimationClock,
data->radiusY,
((DoubleAnimationClockResource)DependentLookup(data->hRadiusYAnimations)).AnimationClock
);
}
break;
case MILCMD.MilDrawEllipse:
{
MILCMD_DRAW_ELLIPSE* data = (MILCMD_DRAW_ELLIPSE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawEllipse(
(Brush)DependentLookup(data->hBrush),
(Pen)DependentLookup(data->hPen),
data->center,
data->radiusX,
data->radiusY
);
}
break;
case MILCMD.MilDrawEllipseAnimate:
{
MILCMD_DRAW_ELLIPSE_ANIMATE* data = (MILCMD_DRAW_ELLIPSE_ANIMATE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawEllipse(
(Brush)DependentLookup(data->hBrush),
(Pen)DependentLookup(data->hPen),
data->center,
((PointAnimationClockResource)DependentLookup(data->hCenterAnimations)).AnimationClock,
data->radiusX,
((DoubleAnimationClockResource)DependentLookup(data->hRadiusXAnimations)).AnimationClock,
data->radiusY,
((DoubleAnimationClockResource)DependentLookup(data->hRadiusYAnimations)).AnimationClock
);
}
break;
case MILCMD.MilDrawGeometry:
{
MILCMD_DRAW_GEOMETRY* data = (MILCMD_DRAW_GEOMETRY*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawGeometry(
(Brush)DependentLookup(data->hBrush),
(Pen)DependentLookup(data->hPen),
(Geometry)DependentLookup(data->hGeometry)
);
}
break;
case MILCMD.MilDrawImage:
{
MILCMD_DRAW_IMAGE* data = (MILCMD_DRAW_IMAGE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawImage(
(ImageSource)DependentLookup(data->hImageSource),
data->rectangle
);
}
break;
case MILCMD.MilDrawImageAnimate:
{
MILCMD_DRAW_IMAGE_ANIMATE* data = (MILCMD_DRAW_IMAGE_ANIMATE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawImage(
(ImageSource)DependentLookup(data->hImageSource),
data->rectangle,
((RectAnimationClockResource)DependentLookup(data->hRectangleAnimations)).AnimationClock
);
}
break;
case MILCMD.MilDrawGlyphRun:
{
MILCMD_DRAW_GLYPH_RUN* data = (MILCMD_DRAW_GLYPH_RUN*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawGlyphRun(
(Brush)DependentLookup(data->hForegroundBrush),
(GlyphRun)DependentLookup(data->hGlyphRun)
);
}
break;
case MILCMD.MilDrawDrawing:
{
MILCMD_DRAW_DRAWING* data = (MILCMD_DRAW_DRAWING*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawDrawing(
(Drawing)DependentLookup(data->hDrawing)
);
}
break;
case MILCMD.MilDrawVideo:
{
MILCMD_DRAW_VIDEO* data = (MILCMD_DRAW_VIDEO*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawVideo(
(MediaPlayer)DependentLookup(data->hPlayer),
data->rectangle
);
}
break;
case MILCMD.MilDrawVideoAnimate:
{
MILCMD_DRAW_VIDEO_ANIMATE* data = (MILCMD_DRAW_VIDEO_ANIMATE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.DrawVideo(
(MediaPlayer)DependentLookup(data->hPlayer),
data->rectangle,
((RectAnimationClockResource)DependentLookup(data->hRectangleAnimations)).AnimationClock
);
}
break;
case MILCMD.MilPushClip:
{
MILCMD_PUSH_CLIP* data = (MILCMD_PUSH_CLIP*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushClip(
(Geometry)DependentLookup(data->hClipGeometry)
);
}
break;
case MILCMD.MilPushOpacityMask:
{
MILCMD_PUSH_OPACITY_MASK* data = (MILCMD_PUSH_OPACITY_MASK*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushOpacityMask(
(Brush)DependentLookup(data->hOpacityMask)
);
}
break;
case MILCMD.MilPushOpacity:
{
MILCMD_PUSH_OPACITY* data = (MILCMD_PUSH_OPACITY*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushOpacity(
data->opacity
);
}
break;
case MILCMD.MilPushOpacityAnimate:
{
MILCMD_PUSH_OPACITY_ANIMATE* data = (MILCMD_PUSH_OPACITY_ANIMATE*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushOpacity(
data->opacity,
((DoubleAnimationClockResource)DependentLookup(data->hOpacityAnimations)).AnimationClock
);
}
break;
case MILCMD.MilPushTransform:
{
MILCMD_PUSH_TRANSFORM* data = (MILCMD_PUSH_TRANSFORM*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushTransform(
(Transform)DependentLookup(data->hTransform)
);
}
break;
case MILCMD.MilPushGuidelineSet:
{
MILCMD_PUSH_GUIDELINE_SET* data = (MILCMD_PUSH_GUIDELINE_SET*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushGuidelineSet(
(GuidelineSet)DependentLookup(data->hGuidelines)
);
}
break;
case MILCMD.MilPushGuidelineY1:
{
MILCMD_PUSH_GUIDELINE_Y1* data = (MILCMD_PUSH_GUIDELINE_Y1*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushGuidelineY1(
data->coordinate
);
}
break;
case MILCMD.MilPushGuidelineY2:
{
MILCMD_PUSH_GUIDELINE_Y2* data = (MILCMD_PUSH_GUIDELINE_Y2*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushGuidelineY2(
data->leadingCoordinate,
data->offsetToDrivenCoordinate
);
}
break;
// Disable warning about obsolete method. This code must remain active
// until we can remove the public BitmapEffect APIs.
#pragma warning disable 0618
case MILCMD.MilPushEffect:
{
MILCMD_PUSH_EFFECT* data = (MILCMD_PUSH_EFFECT*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.PushEffect(
(BitmapEffect)DependentLookup(data->hEffect),
(BitmapEffectInput)DependentLookup(data->hEffectInput)
);
}
break;
#pragma warning restore 0618
case MILCMD.MilPop:
{
MILCMD_POP* data = (MILCMD_POP*)(pCur + sizeof(RecordHeader));
// Retrieve the resources for the dependents and call the context.
ctx.Pop(
);
}
break;
default:
{
Debug.Assert(false);
}
break;
}
pCur += pCurRecord->Size;
}
}
}
}
}
/// <summary>
/// Calls methods on the DrawingContext that are equivalent to the
/// Drawing with the Drawing's current value.
/// </summary>
internal override void WalkCurrentValue(DrawingContextWalker ctx)
{
int popCount = 0;
// We avoid unneccessary ShouldStopWalking checks based on assumptions
// about when ShouldStopWalking is set. Guard that assumption with an
// assertion.
//
// ShouldStopWalking is currently only set during a hit-test walk after
// an object has been hit. Because a DrawingGroup can't be hit until after
// the first Drawing is tested, this method doesn't check ShouldStopWalking
// until after the first child.
//
// We don't need to add this check to other Drawing subclasses for
// the same reason -- if the Drawing being tested isn't a DrawingGroup,
// they are always the 'first child'.
//
// If this assumption is ever broken then the ShouldStopWalking
// check should be done on the first child -- including in the
// WalkCurrentValue method of other Drawing subclasses.
Debug.Assert(!ctx.ShouldStopWalking);
//
// Draw the transform property
//
// Avoid calling PushTransform if the base value is set to the default and
// no animations have been set on the property.
if (!IsBaseValueDefault(DrawingGroup.TransformProperty) ||
(null != AnimationStorage.GetStorage(this, DrawingGroup.TransformProperty)))
{
ctx.PushTransform(Transform);
popCount++;
}
//
// Draw the clip property
//
// Avoid calling PushClip if the base value is set to the default and
// no animations have been set on the property.
if (!IsBaseValueDefault(DrawingGroup.ClipGeometryProperty) ||
(null != AnimationStorage.GetStorage(this, DrawingGroup.ClipGeometryProperty)))
{
ctx.PushClip(ClipGeometry);
popCount++;
}
//
// Draw the opacity property
//
// Avoid calling PushOpacity if the base value is set to the default and
// no animations have been set on the property.
if (!IsBaseValueDefault(DrawingGroup.OpacityProperty) ||
(null != AnimationStorage.GetStorage(this, DrawingGroup.OpacityProperty)))
{
// Push the current value of the opacity property, which
// is what Opacity returns.
ctx.PushOpacity(Opacity);
popCount++;
}
// Draw the opacity mask property
//
if (OpacityMask != null)
{
ctx.PushOpacityMask(OpacityMask);
popCount++;
}
//
// Draw the effect property
//
// Push the current value of the effect property, which
// is what BitmapEffect returns.
if (BitmapEffect != null)
{
// Disable warning about obsolete method. This code must remain active
// until we can remove the public BitmapEffect APIs.
#pragma warning disable 0618
ctx.PushEffect(BitmapEffect, BitmapEffectInput);
#pragma warning restore 0618
popCount++;
}
//
// Draw the Children collection
//
// Get the current value of the children collection
DrawingCollection collection = Children;
// Call Walk on each child
if (collection != null)
{
for (int i = 0; i < collection.Count; i++)
{
Drawing drawing = collection.Internal_GetItem(i);
if (drawing != null)
{
drawing.WalkCurrentValue(ctx);
// Don't visit the remaining children if the previous
// child caused us to stop walking.
if (ctx.ShouldStopWalking)
{
break;
}
}
}
}
//
// Call Pop() for every Push
//
// Avoid placing this logic in a finally block because if an exception is
// thrown, the Walk is simply aborted. There is no requirement to Walk
// through Pop instructions when an exception is thrown.
//
for (int i = 0; i < popCount; i++)
{
ctx.Pop();
}
}
/// <summary>
/// Forward the current value of the content to the DrawingContextWalker
/// methods.
/// </summary>
/// <param name="walker"> DrawingContextWalker to forward content to. </param>
public void WalkContent(DrawingContextWalker walker)
{
DrawingContextWalk(walker);
}
/// <summary> /// Calls methods on the DrawingContext that are equivalent to the /// Drawing with the Drawing's current value. /// </summary> internal abstract void WalkCurrentValue(DrawingContextWalker ctx);
/// <summary>
/// Forward the current value of the content to the DrawingContextWalker
/// methods.
/// </summary>
/// <param name="ctx"> DrawingContextWalker to forward content to. </param>
void IDrawingContent.WalkContent(DrawingContextWalker ctx)
{
((Drawing)this).WalkCurrentValue(ctx);
}
/// <summary>
/// WalkContent - method which walks the content (if present) and calls out to the
/// supplied DrawingContextWalker.
/// </summary>
/// <param name="walker">
/// DrawingContextWalker - the target of the calls which occur during
/// the content walk.
/// </param>
internal void WalkContent(DrawingContextWalker walker)
{
VerifyAPIReadOnly();
if (_content != null)
{
_content.WalkContent(walker);
}
}
/// <summary> /// Calls methods on the DrawingContext that are equivalent to the /// Drawing with the Drawing's current value. /// </summary> internal abstract void WalkCurrentValue(DrawingContextWalker ctx);
/// <summary>
/// Forward the current value of the content to the DrawingContextWalker
/// methods.
/// </summary>
/// <param name="ctx"> DrawingContextWalker to forward content to. </param>
void IDrawingContent.WalkContent(DrawingContextWalker ctx)
{
((Drawing)this).WalkCurrentValue(ctx);
}
