/// <summary>
/// Builds a PdfShading from the specified brush. If a gradient contains transparency, a soft mask is created an added to the
/// specified graphic state.
/// </summary>
PdfShading BuildShading(LinearGradientBrush brush)
{
// Setup shading
PdfShading shading = new PdfShading(Context.PdfDocument);
#if DEBUG
if (DevHelper.RenderComments)
shading.Elements.SetString("/@comment", "This is the shading of a LinearGradientBrush");
#endif
PdfColorMode colorMode = PdfColorMode.Rgb; //this.document.Options.ColorMode;
PdfDictionary function = BuildShadingFunction(brush.GradientStops, false, colorMode);
#if DEBUG
if (DevHelper.RenderComments)
function.Elements.SetString("/@comment", "This is the shading function of a LinearGradientBrush");
#endif
shading.Elements.SetBoolean(PdfShading.Keys.AntiAlias, false);
shading.Elements[PdfShading.Keys.Function] = function;
shading.Elements.SetInteger(PdfShading.Keys.ShadingType, 2); // Axial shading
shading.Elements.SetName(PdfShading.Keys.ColorSpace, "/DeviceRGB"); // TODO: respect ColorMode
double x1 = brush.StartPoint.X;
double y1 = brush.StartPoint.Y;
double x2 = brush.EndPoint.X;
double y2 = brush.EndPoint.Y;
shading.Elements[PdfShading.Keys.Coords] = new PdfLiteral("[{0:0.####} {1:0.####} {2:0.####} {3:0.####}]", x1, y1, x2, y2);
shading.Elements[PdfShading.Keys.Domain] = new PdfLiteral("[0 1]");
if (brush.SpreadMethod == SpreadMethod.Pad)
shading.Elements[PdfShading.Keys.Extend] = new PdfLiteral("[true true]");
else
{
DevHelper.NotImplemented("SpreadMethod." + brush.SpreadMethod.ToString() + " Background painted in green.");
#if DEBUG
// Note from PDF reference: The background color is applied only when the shading is used as part of
// a shading pattern, not when it is painted directly with the sh operator.
shading.Elements[PdfShading.Keys.Background] = new PdfLiteral("[0 1 0]"); // TODO: respect ColorMode
#else
// Best we can currently do
shading.Elements[PdfShading.Keys.Extend] = new PdfLiteral("[true true]");
#endif
}
return shading;
}
protected XPLinearGradientBrush(LinearGradientBrush brush)
: base(brush)
{
}
/// <summary>
/// Parses a LinearGradientBrush element.
/// </summary>
LinearGradientBrush ParseLinearGradientBrush()
{
Debug.Assert(this.reader.Name == "LinearGradientBrush");
bool isEmptyElement = this.reader.IsEmptyElement;
LinearGradientBrush brush = new LinearGradientBrush();
while (MoveToNextAttribute())
{
switch (this.reader.Name)
{
case "Opacity":
brush.Opacity = ParseDouble(this.reader.Value);
break;
case "Transform":
brush.Transform = ParseMatrixTransform(this.reader.Value);
break;
case "ColorInterpolationMode":
brush.ColorInterpolationMode = ParseEnum<ClrIntMode>(this.reader.Value);
break;
case "SpreadMethod":
brush.SpreadMethod = ParseEnum<SpreadMethod>(this.reader.Value);
break;
case "MappingMode":
brush.MappingMode = ParseEnum<MappingMode>(this.reader.Value);
break;
case "StartPoint":
brush.StartPoint = Point.Parse(this.reader.Value);
break;
case "EndPoint":
brush.EndPoint = Point.Parse(this.reader.Value);
break;
case "x:Key":
brush.Key = this.reader.Value;
break;
default:
Debugger.Break();
break;
}
}
if (!isEmptyElement)
{
MoveToNextElement();
while (this.reader.IsStartElement())
{
switch (this.reader.Name)
{
case "LinearGradientBrush.Transform":
MoveToNextElement();
brush.Transform = ParseMatrixTransform();
MoveToNextElement();
break;
case "LinearGradientBrush.GradientStops":
// do not MoveToNextElement();
brush.GradientStops = ParseGradientStops();
break;
default:
Debugger.Break();
break;
}
}
}
MoveToNextElement();
return brush;
}
void RealizeLinearGradientBrush(LinearGradientBrush brush, XForm xform)
{
XMatrix matrix = this.currentTransform;
PdfShadingPattern pattern = new PdfShadingPattern(this.writer.Owner);
pattern.Elements[PdfShadingPattern.Keys.PatternType] = new PdfInteger(2); // shading pattern
// Setup shading
PdfShading shading = new PdfShading(this.writer.Owner);
PdfColorMode colorMode = PdfColorMode.Rgb; //this.document.Options.ColorMode;
PdfDictionary function = BuildShadingFunction(brush.GradientStops, colorMode);
function.Elements.SetString("/@", "This is the shading function of a LinearGradientBrush");
shading.Elements[PdfShading.Keys.Function] = function;
shading.Elements[PdfShading.Keys.ShadingType] = new PdfInteger(2); // Axial shading
//if (colorMode != PdfColorMode.Cmyk)
shading.Elements[PdfShading.Keys.ColorSpace] = new PdfName("/DeviceRGB");
//else
//shading.Elements[Keys.ColorSpace] = new PdfName("/DeviceCMYK");
//double x1 = 0, y1 = 0, x2 = 0, y2 = 0;
double x1 = brush.StartPoint.X;
double y1 = brush.StartPoint.Y;
double x2 = brush.EndPoint.X;
double y2 = brush.EndPoint.Y;
shading.Elements[PdfShading.Keys.Coords] = new PdfLiteral("[{0:0.###} {1:0.###} {2:0.###} {3:0.###}]", x1, y1, x2, y2);
// old: Elements[Keys.Background] = new PdfRawItem("[0 1 1]");
// old: Elements[Keys.Domain] =
shading.Elements[PdfShading.Keys.Extend] = new PdfLiteral("[true true]");
// Setup pattern
pattern.Elements[PdfShadingPattern.Keys.Shading] = shading;
pattern.Elements[PdfShadingPattern.Keys.Matrix] = PdfLiteral.FromMatrix(matrix); // new PdfLiteral("[" + PdfEncoders.ToString(matrix) + "]");
string name = this.writer.Resources.AddPattern(pattern);
this.writer.WriteLiteral("/Pattern cs\n", name);
this.writer.WriteLiteral("{0} scn\n", name);
double alpha = brush.Opacity * brush.GradientStops.GetAverageAlpha();
if (alpha < 1 && this.writer.renderMode == RenderMode.Default)
{
#if true
PdfExtGState extGState = this.writer.Owner.ExtGStateTable.GetExtGStateNonStroke(alpha);
string gs = this.writer.Resources.AddExtGState(extGState);
this.writer.WriteLiteral("{0} gs\n", gs);
#else
#if true
if (xform == null)
{
PdfExtGState extGState = this.writer.Owner.ExtGStateTable.GetExtGStateNonStroke(alpha);
string gs = this.writer.Resources.AddExtGState(extGState);
this.writer.WriteGraphicState(extGState);
}
else
{
//PdfFormXObject pdfForm = this.writer.Owner.FormTable.GetForm(form);
PdfFormXObject pdfForm = xform.pdfForm;
pdfForm.Elements.SetString("/@", "This is the Form XObject of the soft mask");
string formName = this.writer.Resources.AddForm(pdfForm);
PdfTransparencyGroupAttributes tgAttributes = new PdfTransparencyGroupAttributes(this.writer.Owner);
//this.writer.Owner.Internals.AddObject(tgAttributes);
tgAttributes.Elements.SetName(PdfTransparencyGroupAttributes.Keys.CS, "/DeviceRGB");
// Set reference to transparency group attributes
pdfForm.Elements.SetObject(PdfFormXObject.Keys.Group, tgAttributes);
pdfForm.Elements[PdfFormXObject.Keys.Matrix] = new PdfLiteral("[1.001 0 0 1.001 0.001 0.001]");
PdfSoftMask softmask = new PdfSoftMask(this.writer.Owner);
this.writer.Owner.Internals.AddObject(softmask);
softmask.Elements.SetString("/@", "This is the soft mask");
softmask.Elements.SetName(PdfSoftMask.Keys.S, "/Luminosity");
softmask.Elements.SetReference(PdfSoftMask.Keys.G, pdfForm);
//pdfForm.Elements.SetName(PdfFormXObject.Keys.Type, "Group");
//pdfForm.Elements.SetName(PdfFormXObject.Keys.ss.Ss.Type, "Group");
PdfExtGState extGState = new PdfExtGState(this.writer.Owner);
this.writer.Owner.Internals.AddObject(extGState);
extGState.Elements.SetReference(PdfExtGState.Keys.SMask, softmask);
this.writer.WriteGraphicState(extGState);
}
#else
XForm form = new XForm(this.writer.Owner, 220, 140);
XGraphics formGfx = XGraphics.FromForm(form);
// draw something
//XSolidBrush xbrush = new XSolidBrush(XColor.FromArgb(128, 128, 128));
XLinearGradientBrush xbrush = new XLinearGradientBrush(new XPoint(0, 0), new XPoint(220,0), XColors.White, XColors.Black);
formGfx.DrawRectangle(xbrush, -10000, -10000, 20000, 20000);
//formGfx.DrawString("Text, Graphics, Images, and Forms", new XFont("Verdana", 10, XFontStyle.Regular), XBrushes.Navy, 3, 0, XStringFormat.TopLeft);
formGfx.Dispose();
// Close form
form.Finish();
PdfFormXObject pdfForm = this.writer.Owner.FormTable.GetForm(form);
string formName = this.writer.Resources.AddForm(pdfForm);
//double x = 20, y = 20;
//double cx = 1;
//double cy = 1;
//this.writer.AppendFormat("q {2:0.###} 0 0 -{3:0.###} {0:0.###} {4:0.###} cm 100 Tz {5} Do Q\n",
// x, y, cx, cy, y + 0, formName);
//this.writer.AppendFormat("q {2:0.###} 0 0 -{3:0.###} {0:0.###} {4:0.###} cm 100 Tz {5} Do Q\n",
// x, y, cx, cy, y + 220/1.5, formName);
PdfTransparencyGroupAttributes tgAttributes = new PdfTransparencyGroupAttributes(this.writer.Owner);
this.writer.Owner.Internals.AddObject(tgAttributes);
tgAttributes.Elements.SetName(PdfTransparencyGroupAttributes.Keys.CS, "/DeviceRGB");
// Set reference to transparency group attributes
pdfForm.Elements.SetReference(PdfFormXObject.Keys.Group, tgAttributes);
PdfSoftMask softmask = new PdfSoftMask(this.writer.Owner);
this.writer.Owner.Internals.AddObject(softmask);
softmask.Elements.SetName(PdfSoftMask.Keys.S, "/Luminosity");
softmask.Elements.SetReference(PdfSoftMask.Keys.G, pdfForm);
//pdfForm.Elements.SetName(PdfFormXObject.Keys.Type, "Group");
//pdfForm.Elements.SetName(PdfFormXObject.Keys.ss.Ss.Type, "Group");
PdfExtGState extGState = new PdfExtGState(this.writer.Owner);
this.writer.Owner.Internals.AddObject(extGState);
extGState.Elements.SetReference(PdfExtGState.Keys.SMask, softmask);
this.writer.WriteGraphicState(extGState);
#endif
#endif
}
}
/// <summary>
/// Builds a monochrome shading for a form XObject of a soft mask.
/// </summary>
PdfShading BuildShadingForSoftMask(LinearGradientBrush brush)
{
// Setup shading
//<<
// /ShadingType 2
// /AntiAlias false
// /BBox [0 0 510.236 680.315]
// /ColorSpace /DeviceGray
// /Coords [5 5 153.492 -86.924]
// /Domain [0 1]
// /Extend [true true]
// /Function 18 0 R
//>>
PdfShading shading = Context.PdfDocument.Internals.CreateIndirectObject<PdfShading>();
#if DEBUG
if (DevHelper.RenderComments)
shading.Elements.SetString("/@comment", "This is the shading function of a soft mask");
#endif
shading.Elements.SetInteger(PdfShading.Keys.ShadingType, 2); // Axial shading
shading.Elements.SetBoolean(PdfShading.Keys.AntiAlias, false);
// TODO: BBox full page
//shading.Elements.SetValue(PdfShading.Keys.BBox, new PdfLiteral("[0 0 480 640]"));
shading.Elements.SetName(PdfShading.Keys.ColorSpace, "/DeviceGray");
double x1 = brush.StartPoint.X;
double y1 = brush.StartPoint.Y;
double x2 = brush.EndPoint.X;
double y2 = brush.EndPoint.Y;
shading.Elements.SetValue(PdfShading.Keys.Coords, new PdfLiteral("[{0:0.####} {1:0.####} {2:0.####} {3:0.####}]", x1, y1, x2, y2));
shading.Elements.SetValue(PdfShading.Keys.Domain, new PdfLiteral("[0 1]"));
shading.Elements.SetValue(PdfShading.Keys.Extend, new PdfLiteral("[true true]"));
PdfColorMode colorMode = PdfColorMode.Rgb; //this.document.Options.ColorMode;
PdfDictionary function = BuildShadingFunction(brush.GradientStops, true, colorMode);
#if true
shading.Elements.SetValue(PdfShading.Keys.Function, function);
#else
Context.PdfDocument.Internals.AddObject(function);
shading.Elements.SetReference(PdfShading.Keys.Function, function);
#endif
return shading;
}
/// <summary>
/// Builds a form XObject from a linear gradient brush that uses transparency.
/// </summary>
public static PdfFormXObject BuildFormFromLinearGradientBrush(DocumentRenderingContext context, LinearGradientBrush brush, PathGeometry geometry)
{
LinearShadingBuilder builder = new LinearShadingBuilder(context);
PdfFormXObject pdfForm = builder.BuildForm(brush, geometry);
return pdfForm;
}
/// <summary>
/// Builds a pattern from a linear gradient brush.
/// </summary>
public static PdfShadingPattern BuildPatternFromLinearGradientBrush(DocumentRenderingContext context, LinearGradientBrush brush, XMatrix transform)
{
LinearShadingBuilder builder = new LinearShadingBuilder(context);
PdfShadingPattern pattern = builder.BuildShadingPattern(brush, transform);
return pattern;
}
/// <summary>
/// Builds a shading from a linear gradient brush.
/// </summary>
public static PdfShading BuildShadingFromLinearGradientBrush(DocumentRenderingContext context, LinearGradientBrush brush)
{
LinearShadingBuilder builder = new LinearShadingBuilder(context);
PdfShading shading = builder.BuildShading(brush);
return shading;
}
/// <summary>
/// Builds the soft mask.
/// </summary>
PdfSoftMask BuildSoftMask(LinearGradientBrush brush)
{
Debug.Assert(brush.GradientStops.HasTransparency);
XRect viewBox = new XRect(0, 0, 360, 480); // HACK
//XForm xform = new XForm(Context.PdfDocument, viewBox);
PdfFormXObject form = Context.PdfDocument.Internals.CreateIndirectObject<PdfFormXObject>();
#if DEBUG
if (DevHelper.RenderComments)
form.Elements.SetString("/@comment", "This is the Form XObject of the soft mask");
#endif
form.Elements.SetRectangle(PdfFormXObject.Keys.BBox, new PdfRectangle(viewBox));
// Transparency group of mask form
//<<
// /CS /DeviceGray
// /I false
// /K false
// /S /Transparency
// /Type /Group
//>>
PdfTransparencyGroupAttributes tgAttributes = Context.PdfDocument.Internals.CreateIndirectObject<PdfTransparencyGroupAttributes>();
tgAttributes.Elements.SetName(PdfTransparencyGroupAttributes.Keys.CS, "/DeviceGray");
tgAttributes.Elements.SetBoolean(PdfTransparencyGroupAttributes.Keys.I, false);
tgAttributes.Elements.SetBoolean(PdfTransparencyGroupAttributes.Keys.K, false);
// ExtGState of mask form
//<<
// /AIS false
// /BM /Normal
// /ca 1
// /CA 1
// /op false
// /OP false
// /OPM 1
// /SA true
// /SMask /None
// /Type /ExtGState
//>>
PdfExtGState pdfStateMaskFrom = Context.PdfDocument.Internals.CreateIndirectObject<PdfExtGState>();
pdfStateMaskFrom.SetDefault1();
// Shading of mask form
PdfShading shadingFrom = BuildShadingForSoftMask(brush);
////// Set reference to transparency group attributes
////pdfForm.Elements.SetObject(PdfFormXObject.Keys.Group, tgAttributes);
////pdfForm.Elements[PdfFormXObject.Keys.Matrix] = new PdfLiteral("[1.001 0 0 1.001 0.001 0.001]");
// Soft mask
//<<
// /G 21 0 R % form
// /S /Luminosity
// /Type /Mask
//>>
PdfSoftMask softmask = Context.PdfDocument.Internals.CreateIndirectObject<PdfSoftMask>(); // new PdfSoftMask(this.writer.Owner);
//extGState.Elements.SetReference(PdfExtGState.Keys.SMask, softmask);
//this.writer.Owner.Internals.AddObject(softmask);
#if DEBUG
if (DevHelper.RenderComments)
softmask.Elements.SetString("/@comment", "This is the soft mask");
#endif
softmask.Elements.SetName(PdfSoftMask.Keys.S, "/Luminosity");
softmask.Elements.SetReference(PdfSoftMask.Keys.G, form);
// Create content of mask form
//<<
// /BBox [200.118 369.142 582.795 -141.094]
// /Group 16 0 R
// /Length 121
// /Matrix [1 0 0 1 0 0]
// /Resources
// <<
// /ExtGState
// <<
// /GS0 20 0 R
// >>
// /Shading
// <<
// /Sh0 19 0 R
// >>
// >>
// /Subtype /Form
//>>
//stream
// q
// 200.118 369.142 382.677 -510.236 re
// W n
// q
// 0 g
// 1 i
// GS0 gs
// 0.75 0 0 -0.75 200.1181183 369.1417236 cm
// BX /Sh0 sh EX Q
// Q
//endstream
form.Elements.SetReference(PdfFormXObject.Keys.Group, tgAttributes);
PdfContentWriter writer = new PdfContentWriter(Context, form);
writer.BeginContentRaw();
// Acrobat 8 clips to bounding box, so we should do
// why 0 480 360 -480 re ??
//writer.WriteClip(bbox);
//writer.WriteGraphicsState(extGState);
writer.WriteLiteral("1 i 0 g\n");
writer.WriteLiteral(writer.Resources.AddExtGState(pdfStateMaskFrom) + " gs\n");
XMatrix transform = new XMatrix(); //(brush.Viewport.Width / viewBoxForm.width, 0, 0, brush.Viewport.Height / viewBoxForm.height, 0, 0);
writer.WriteMatrix(transform);
writer.WriteLiteral("BX " + writer.Resources.AddShading(shadingFrom) + " sh EX\n");
writer.EndContent();
return softmask;
}
/// <summary>
/// Builds a PdfFormXObject from the specified brush.
/// // If a gradient contains transparency, a soft mask is created an added to the specified graphic state.
/// </summary>
PdfFormXObject BuildForm(LinearGradientBrush brush, PathGeometry geometry)
{
PdfFormXObject pdfForm = Context.PdfDocument.Internals.CreateIndirectObject<PdfFormXObject>();
// HACK
pdfForm.Elements.SetRectangle(PdfFormXObject.Keys.BBox, new PdfRectangle(0, 640, 480, 0));
// Transparency group of the form
//<<
// /I true
// /K false
// /S /Transparency
// /Type /Group
//>>
PdfTransparencyGroupAttributes tgPrimaryForm = Context.PdfDocument.Internals.CreateIndirectObject<PdfTransparencyGroupAttributes>();
// not set by Acrobat: tgAttributes.Elements.SetName(PdfTransparencyGroupAttributes.Keys.CS, "/DeviceRGB");
tgPrimaryForm.Elements.SetBoolean(PdfTransparencyGroupAttributes.Keys.I, true);
tgPrimaryForm.Elements.SetBoolean(PdfTransparencyGroupAttributes.Keys.K, false);
pdfForm.Elements.SetReference(PdfFormXObject.Keys.Group, tgPrimaryForm);
// Shading
PdfShading shading = BuildShading(brush);
// ExtGState
//<<
// /AIS false
// /BM /Normal
// /ca 1
// /CA 1
// /op false
// /OP false
// /OPM 1
// /SA true
// /SMask 22 0 R
// /Type /ExtGState
//>>
PdfExtGState pdfExtGState = Context.PdfDocument.Internals.CreateIndirectObject<PdfExtGState>();
pdfExtGState.SetDefault1();
// Soft mask
PdfSoftMask softmask = BuildSoftMask(brush);
pdfExtGState.Elements.SetReference(PdfExtGState.Keys.SMask, softmask);
// PdfFormXObject
//<<
// /BBox [200.118 369.142 582.795 -141.094]
// /Group 11 0 R
// /Length 117
// /Matrix [1 0 0 1 0 0]
// /Resources
// <<
// /ColorSpace
// <<
// /CS0 8 0 R
// >>
// /ExtGState
// <<
// /GS0 23 0 R
// >>
// /Shading
// <<
// /Sh0 14 0 R
// >>
// >>
// /Subtype /Form
//>>
//stream
//q
//203.868 365.392 157.5 -97.5 re
//W* n
//q
//0 g
//1 i
///GS0 gs
//0.75 0 0 -0.75 200.1181183 369.1417236 cm
//BX /Sh0 sh EX Q
//Q
//endstream
PdfContentWriter writer = new PdfContentWriter(Context, pdfForm);
writer.BeginContentRaw();
// Acrobat 8 clips to bounding box, so we should do
writer.WriteClip(geometry);
//writer.WriteGraphicsState(extGState);
//writer.WriteLiteral("0 g\n");
writer.WriteLiteral(writer.Resources.AddExtGState(pdfExtGState) + " gs\n");
XMatrix transform = new XMatrix(); //(brush.Viewport.Width / viewBoxForm.width, 0, 0, brush.Viewport.Height / viewBoxForm.height, 0, 0);
writer.WriteMatrix(transform);
writer.WriteLiteral("BX " + writer.Resources.AddShading(shading) + " sh EX\n");
writer.EndContent();
return pdfForm;
}
/// <summary>
/// Builds a PdfShadingPattern from the specified brush.
/// </summary>
PdfShadingPattern BuildShadingPattern(LinearGradientBrush brush, XMatrix transform)
{
//<<
// /Matrix [0.75 0 0 -0.75 8 470.4]
// /PatternType 2
// /Shading 22 0 R
// /Type /Pattern
//>>
XMatrix matrix = transform;
PdfShadingPattern pattern = Context.PdfDocument.Internals.CreateIndirectObject<PdfShadingPattern>();
pattern.Elements.SetInteger(PdfShadingPattern.Keys.PatternType, 2); // Shading
pattern.Elements.SetMatrix(PdfShadingPattern.Keys.Matrix, matrix);
PdfShading shading = BuildShading(brush);
Context.PdfDocument.Internals.AddObject(shading);
pattern.Elements.SetReference(PdfShadingPattern.Keys.Shading, shading);
return pattern;
}
