/// <summary>
/// Obtains a matrix that maps the TileBrush's content to the coordinate
/// space of the shape it is filling.
/// </summary>
/// <param name="shapeFillBounds">
/// Fill-bounds of the shape this brush is stroking/filling
/// </param>
/// <param name="tileBrushMapping">
/// Output matrix that maps the TileBrush's content to the coordinate
/// space of the shape it is filling
/// </param>
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;
}
}
}
}
internal unsafe virtual void ConvertToD3DMATRIX(/* out */ D3DMATRIX *milMatrix)
{
Matrix matrix = Value;
MILUtilities.ConvertToD3DMATRIX(&matrix, milMatrix);
}