// ===========================================================================
// ©2013-2026 WebSupergoo. All rights reserved.
//
// This source code is for use exclusively with the ABCpdf product with
// which it is distributed, under the terms of the license for that
// product. Details can be found at
//
// http://www.websupergoo.com/
//
// This copyright notice must not be deleted and must be reproduced alongside
// any sections of code extracted from this module.
// ===========================================================================
using System;
using System.Collections.Generic;
using System.Text;
using System.Globalization;
using System.Runtime.InteropServices;
using WebSupergoo.ABCpdf14;
namespace WebSupergoo.ABCpdf14.Drawing {
/// <summary>Rectangle in double precision.</summary>
[StructLayout(LayoutKind.Auto)]
internal struct PDFRect {
/// <summary>The entire plane.</summary>
public static PDFRect Infinity {
get {
return new PDFRect(double.MinValue, double.MinValue,
double.MaxValue, double.MaxValue);
}
}
public double X, Y, Width, Height;
public PDFRect(double x, double y, double width, double height) {
X = x;
Y = y;
Width = width;
Height = height;
}
public double Right {
get { return double.IsInfinity(Width)? Width: X+Width; }
}
public double Top {
get { return double.IsInfinity(Height)? Height: Y+Height; }
}
/// <summary>The string representation as used in PDF and XRect.String.</summary>
public override string ToString() {
const string format = PDFContent.mFloatFormat;
return string.Format(NumberFormatInfo.InvariantInfo,
"{0:" + format + "} {1:" + format
+ "} {2:" + format + "} {3:" + format + "}",
X, Y, Right, Top);
}
public void Union(double x, double y, double width, double height) {
if(width>0) {
if(!(Width>0)) {
Width = width;
X = x;
} else if(x<X) {
Width += X-x;
X = x;
if(width>Width)
Width = width;
} else {
double right = Right;
double rectRight = double.IsInfinity(width)? width: x+width;
if(rectRight>right)
Width = rectRight-X;
}
}
if(height>0) {
if(!(Height>0)) {
Height = height;
Y = y;
} else if(y<Y) {
Height += Y-y;
Y = y;
if(height>Height)
Height = height;
} else {
double top = Top;
double rectTop = double.IsInfinity(height)? height: y+height;
if(rectTop>top)
Height = rectTop-Y;
}
}
}
public void Intersect(PDFRect rect) {
if(X<rect.X) {
Width -= rect.X-X;
X = rect.X;
}
if(rect.Width<double.PositiveInfinity
&& (!(Width<double.PositiveInfinity) || X+Width>rect.X+rect.Width))
Width = rect.X+rect.Width-X;
if(Y<rect.Y) {
Height -= rect.Y-Y;
Y = rect.Y;
}
if(rect.Height<double.PositiveInfinity
&& (!(Height<double.PositiveInfinity) || Y+Height>rect.Y+rect.Height))
Height = rect.Y+rect.Height-Y;
}
internal static void GetLineBounds(double x0, double y0,
double x1, double y1, out double outX, out double outY,
out double outWidth, out double outHeight)
{
if(x0<=x1) {
outWidth = x1-x0;
outX = x0;
} else {
outWidth = x0-x1;
outX = x1;
}
if(y0<=y1) {
outHeight = y1-y0;
outY = y0;
} else {
outHeight = y0-y1;
outY = y1;
}
}
internal static void GetBezierBounds(double start, double control0,
double control1, double end, out double outX, out double outWidth)
{
double midControl = (control0+control1)/2;
double quadControl0 = (start+control0)/2;
double quadControl1 = (quadControl0+midControl)/2;
quadControl0 = (start+quadControl0*3)/4;
double quadControl3 = (end+control1)/2;
double quadControl2 = (quadControl3+midControl)/2;
quadControl3 = (end+quadControl3*3)/4;
double mid = quadControl1+quadControl2;
quadControl1 = (quadControl1*6+mid)/8;
quadControl2 = (quadControl2*6+mid)/8;
double x;
if(start<=end)
x = start;
else {
x = end;
end = start;
}
if(quadControl0<x)
x = quadControl0;
else if(quadControl0>end)
end = quadControl0;
if(quadControl1<x)
x = quadControl1;
else if(quadControl1>end)
end = quadControl1;
if(quadControl2<x)
x = quadControl2;
else if(quadControl2>end)
end = quadControl2;
if(quadControl3<x)
x = quadControl3;
else if(quadControl3>end)
end = quadControl3;
outX = x;
outWidth = end-x;
}
}
/// <summary>Matrix in double precision.</summary>
[StructLayout(LayoutKind.Auto)]
internal struct PDFMatrix {
public static PDFMatrix Identity { get { return new PDFMatrix(1, 0, 0, 1, 0, 0); } }
public double M00, M01, M10, M11, M20, M21;
public PDFMatrix(double m00, double m01, double m10, double m11,
double m20, double m21)
{
M00 = m00;
M01 = m01;
M10 = m10;
M11 = m11;
M20 = m20;
M21 = m21;
}
public PDFMatrix(PDFMatrix v, double m00, double m01, double m10, double m11,
double m20, double m21)
{
M00 = v.M00*m00+v.M10*m01;
M01 = v.M01*m00+v.M11*m01;
M10 = v.M00*m10+v.M10*m11;
M11 = v.M01*m10+v.M11*m11;
M20 = v.M00*m20+v.M10*m21+v.M20;
M21 = v.M01*m20+v.M11*m21+v.M21;
}
public PDFMatrix(ref PDFMatrix v, double m00, double m01, double m10, double m11,
double m20, double m21)
{
M00 = v.M00*m00+v.M10*m01;
M01 = v.M01*m00+v.M11*m01;
M10 = v.M00*m10+v.M10*m11;
M11 = v.M01*m10+v.M11*m11;
M20 = v.M00*m20+v.M10*m21+v.M20;
M21 = v.M01*m20+v.M11*m21+v.M21;
}
public PDFMatrix(PDFMatrix v0, PDFMatrix v1) : this(ref v0, ref v1) { }
public PDFMatrix(ref PDFMatrix v0, ref PDFMatrix v1) {
M00 = v0.M00*v1.M00+v0.M10*v1.M01;
M01 = v0.M01*v1.M00+v0.M11*v1.M01;
M10 = v0.M00*v1.M10+v0.M10*v1.M11;
M11 = v0.M01*v1.M10+v0.M11*v1.M11;
M20 = v0.M00*v1.M20+v0.M10*v1.M21+v0.M20;
M21 = v0.M01*v1.M20+v0.M11*v1.M21+v0.M21;
}
public double MultiplierXSquare { get { return M00*M00+M10*M10; } }
public double MultiplierYSquare { get { return M01*M01+M11*M11; } }
public void TransformPoint(double x, double y,
out double outX, out double outY)
{
outX = x*M00+y*M10+M20;
outY = x*M01+y*M11+M21;
}
public void Translate(double offsetX, double offsetY) {
TransformPoint(offsetX, offsetY, out M20, out M21);
}
public void Scale(double scaleX, double scaleY) {
M00 *= scaleX;
M01 *= scaleX;
M10 *= scaleY;
M11 *= scaleY;
}
public void GetRectBounds(double x, double y,
double width, double height, out double outX, out double outY,
out double outWidth, out double outHeight)
{
TransformPoint(x, y, out x, out y);
double widthX = width*M00;
double heightX = height*M10;
if(widthX>=heightX) {
if(widthX<0) {
widthX = -widthX-heightX;
x -= widthX;
} else if(heightX<0) {
widthX -= heightX;
x += heightX;
} else
widthX += heightX;
} else {
if(heightX<0) {
widthX = -widthX-heightX;
x -= widthX;
} else if(widthX<0) {
x += widthX;
widthX = heightX-widthX;
} else
widthX += heightX;
}
outX = x;
outWidth = widthX;
double heightY = height*M11;
double widthY = width*M01;
if(heightY>=widthY) {
if(heightY<0) {
heightY = -heightY-widthY;
y -= heightY;
} else if(widthY<0) {
heightY -= widthY;
y += widthY;
} else
heightY += widthY;
} else {
if(widthY<0) {
heightY = -heightY-widthY;
y -= heightY;
} else if(heightY<0) {
y += heightY;
heightY = widthY-heightY;
} else
heightY += widthY;
}
outY = y;
outHeight = heightY;
}
internal void GetBezierBounds(double startX, double startY,
double controlX0, double controlY0,
double controlX1, double controlY1, double endX, double endY,
out double outX, out double outY,
out double outWidth, out double outHeight)
{
// startX and startY are already transformed
//TransformPoint(startX, startY, out startX, out startY);
TransformPoint(controlX0, controlY0, out controlX0, out controlY0);
TransformPoint(controlX1, controlY1, out controlX1, out controlY1);
TransformPoint(endX, endY, out endX, out endY);
PDFRect.GetBezierBounds(startX, controlX0, controlX1, endX,
out outX, out outWidth);
PDFRect.GetBezierBounds(startY, controlY0, controlY1, endY,
out outY, out outHeight);
}
}
/// <summary>Form XObject ID and bounds.</summary>
[StructLayout(LayoutKind.Auto)]
internal struct PDFFormXObjectID {
public int ID;
public PDFRect Bounds;
public PDFFormXObjectID(int id, PDFRect bounds) {
ID = id;
Bounds = bounds;
}
}
/// <summary>PDF content with bounds for the construction of Form XObjects.</summary>
/// <example>This example shows how to use PDFBoundedContent with a main PDFContent.</example>
/// <code>
/// PDFBoundedContent theContent = new PDFBoundedContent(theDoc);
/// ... // add some content to theContent
/// PDFFormXObjectID theXObjID = theContent.WriteToFormXObject();
/// theDoc.GetInfo(theXObjID.ID, "Compress");
/// // PDFFormXObjectID may be reused with PDFContent.DoFormXObject
/// // many times and/or on different main PDFContent's as long as
/// // they are in the same document
/// theMainContent.DoFormXObject(theXObjID);
/// </code>
internal class PDFBoundedContent: PDFContent {
/// <summary>The graphics state for the calculation of the bounds.</summary>
protected class PDFGraphicsState {
public PDFRect ClipBounds;
public PDFMatrix Matrix;
public double LineWidth;
public double MiterLimit;
public LineJoin LineJoin;
public LineCap LineCap;
public int FontID;
public double FontSize;
public double CharSpacing;
public double WordSpacing;
public double HorizontalTextScale;
public double TextLeading;
public TextRenderingMode TextRender;
public double TextRise;
public PDFGraphicsState() {
ClipBounds = PDFRect.Infinity;
Matrix = PDFMatrix.Identity;
LineWidth = 1;
MiterLimit = 10;
LineJoin = PDFContent.LineJoin.Miter;
LineCap = PDFContent.LineCap.Butt;
HorizontalTextScale = 100;
TextRender = TextRenderingMode.FillText;
}
private PDFGraphicsState(PDFGraphicsState v) {
ClipBounds = v.ClipBounds;
Matrix = v.Matrix;
LineWidth = v.LineWidth;
MiterLimit = v.MiterLimit;
LineJoin = v.LineJoin;
LineCap = v.LineCap;
FontID = v.FontID;
FontSize = v.FontSize;
CharSpacing = v.CharSpacing;
WordSpacing = v.WordSpacing;
HorizontalTextScale = v.HorizontalTextScale;
TextLeading = v.TextLeading;
TextRender = v.TextRender;
TextRise = v.TextRise;
}
public PDFGraphicsState Clone() { return CloneState(); }
protected virtual PDFGraphicsState CloneState() {
return new PDFGraphicsState(this);
}
}
/// <summary>The Form XObject ID.</summary>
private int _xobjID;
/// <summary>The stack of graphics states.</summary>
private Stack<PDFGraphicsState> _stateStack;
/// <summary>The current graphics state.</summary>
private PDFGraphicsState _state;
/// <summary>The current drawing position.</summary>
private double _x, _y;
/// <summary>The bounds of the content.</summary>
private PDFRect _bounds;
/// <summary>The bounds of path being constructed.</summary>
private PDFRect _pathBounds;
/// <summary>The text line matrix.</summary>
private PDFMatrix _textMatrix;
/// <summary>The ID of the font whose information is loaded/cached.</summary>
private int _fontInfoID;
/// <summary>The font glyph bounding box.</summary>
private XRect _fontBBox;
/// <summary>Whether the font is multibyte.</summary>
private bool _fontIsMultibyte;
public PDFBoundedContent(Doc doc, DocumentCache docCache) : this(doc, docCache,
doc.AddObject("<</Type /XObject /Subtype /Form"
+" /Resources <</ProcSet[/PDF /Text /ImageB /ImageC /ImageI]>>>>stream\nendstream\n"))
{ }
public PDFBoundedContent(Doc doc, DocumentCache docCache, int xobjID) : base(doc, docCache) {
_xobjID = xobjID;
_stateStack = new Stack<PDFGraphicsState>();
_state = new PDFGraphicsState();
_textMatrix = PDFMatrix.Identity;
_fontBBox = new XRect();
}
protected override int ResourcesObjectID { get { return _xobjID; } }
private void UnionBounds(PDFRect rect) {
rect.Intersect(_state.ClipBounds);
_bounds.Union(rect.X, rect.Y, rect.Width, rect.Height);
}
private void UnionPathBounds(double lineWidth) {
double x = _pathBounds.X;
double y = _pathBounds.Y;
if(lineWidth>0) {
lineWidth /= 2;
double halfWidthX = lineWidth*Math.Sqrt(_state.Matrix.MultiplierXSquare);
double halfWidthY = lineWidth*Math.Sqrt(_state.Matrix.MultiplierYSquare);
_pathBounds.X -= halfWidthX;
_pathBounds.Y -= halfWidthY;
_pathBounds.Width += 2*halfWidthX;
_pathBounds.Height += 2*halfWidthY;
}
UnionBounds(_pathBounds);
_pathBounds.X = x;
_pathBounds.Y = y;
_pathBounds.Width = 0;
_pathBounds.Height = 0;
}
public override void Move(double x, double y) {
base.Move(x, y);
_state.Matrix.TransformPoint(x, y, out _x, out _y);
}
public override void Line(double x, double y) {
base.Line(x, y);
double x0 = _x, y0 = _y;
_state.Matrix.TransformPoint(x, y, out _x, out _y);
PDFRect.GetLineBounds(x0, y0, _x, _y, out x0, out y0, out x, out y);
_pathBounds.Union(x0, y0, x, y);
}
public override void Rect(double x, double y, double w, double h) {
base.Rect(x, y, w, h);
_state.Matrix.TransformPoint(x, y, out _x, out _y);
_state.Matrix.GetRectBounds(x, y, w, h, out x, out y, out w, out h);
_pathBounds.Union(x, y, w, h);
}
public override void Bezier(double x1, double y1, double x2, double y2,
double x3, double y3)
{
base.Bezier(x1, y1, x2, y2, x3, y3);
double x0 = _x, y0 = _y;
_state.Matrix.TransformPoint(x3, y3, out _x, out _y);
_state.Matrix.GetBezierBounds(x0, y0, x1, y1, x2, y2, x3, y3,
out x0, out y0, out x1, out y1);
_pathBounds.Union(x0, y0, x1, y1);
}
public override void Stroke() {
base.Stroke();
UnionPathBounds(_state.LineWidth);
}
public override void Fill() {
base.Fill();
UnionPathBounds(0);
}
public override void FillEvenOddRule() {
base.FillEvenOddRule();
UnionPathBounds(0);
}
public override void Clip() {
base.Clip();
_state.ClipBounds.Intersect(_pathBounds);
_pathBounds.Width = 0;
_pathBounds.Height = 0;
}
public override void ClipEvenOddRule() {
base.ClipEvenOddRule();
_state.ClipBounds.Intersect(_pathBounds);
_pathBounds.Width = 0;
_pathBounds.Height = 0;
}
public override void SaveState() {
base.SaveState();
_stateStack.Push(_state.Clone());
}
public override void RestoreState() {
base.RestoreState();
_state = _stateStack.Pop();
}
public override void SetLineWidth(double v) {
base.SetLineWidth(v);
_state.LineWidth = Math.Abs(v);
}
public override void SetLineCap(int v) {
base.SetLineCap(v);
_state.LineCap = (LineCap)v;
}
public override void SetLineJoin(int v) {
base.SetLineJoin(v);
_state.LineJoin = (LineJoin)v;
}
public override void SetMiterLimit(double v) {
base.SetMiterLimit(v);
_state.MiterLimit = Math.Abs(v);
}
public override void Transform(double a, double b, double c, double d,
double h, double v)
{
base.Transform(a, b, c, d, h, v);
_state.Matrix = new PDFMatrix(ref _state.Matrix, a, b, c, d, h, v);
}
public override void AddContent(PDFContent theContent) {
throw new NotSupportedException("PDFBoundedContent does not support AddContent.");
}
public override bool AddToDoc() {
throw new InvalidOperationException("PDFBoundedContent does not allow AddToDoc.");
}
/// <summary>Write the contents to the Form XObject.</summary>
public PDFFormXObjectID WriteToFormXObject() {
WriteAllGStates();
Doc.SetInfo(_xobjID, "stream", Contents.ToString());
Doc.SetInfo(_xobjID, "/BBox:Rect", _bounds.ToString());
ShowErrors();
return new PDFFormXObjectID(_xobjID, _bounds);
}
public override void DoImage(int imageID) {
base.DoImage(imageID);
PDFRect rect;
_state.Matrix.GetRectBounds(0, 0, 1, 1,
out rect.X, out rect.Y, out rect.Width, out rect.Height);
UnionBounds(rect);
}
public override void DoFormXObject(PDFFormXObjectID xobjID) {
base.DoFormXObject(xobjID);
PDFRect rect;
_state.Matrix.GetRectBounds(xobjID.Bounds.X, xobjID.Bounds.Y,
xobjID.Bounds.Width, xobjID.Bounds.Height,
out rect.X, out rect.Y, out rect.Width, out rect.Height);
UnionBounds(rect);
}
public override void BeginText() {
base.BeginText();
_textMatrix = PDFMatrix.Identity;
}
public override void SetTextRenderingMode(TextRenderingMode mode) {
base.SetTextRenderingMode(mode);
_state.TextRender = mode;
}
public override void SetCharacterSpacing(double tc) {
base.SetCharacterSpacing(tc);
_state.CharSpacing = tc;
}
public override void SetWordSpacing(double tw) {
base.SetWordSpacing(tw);
_state.WordSpacing = tw;
}
public override void SetHorizontalScaling(double th) {
base.SetHorizontalScaling(th);
_state.HorizontalTextScale = th;
}
public override void SetTextLeading(double tl) {
base.SetTextLeading(tl);
_state.TextLeading = tl;
}
public override void SetTextRise(double ts) {
base.SetTextRise(ts);
_state.TextRise = ts;
}
public override void ShowTextString(string text) {
base.ShowTextString(text);
if(text.Length<=0 || _state.FontID==0 || !(_state.FontSize>0))
return;
string s = Doc.GetInfo(_state.FontID, "Widths "+text);
if(s.Length<=0)
return;
if(_fontInfoID!=_state.FontID) {
_fontIsMultibyte = Doc.GetInfo(_state.FontID, "/Subtype:Name")=="Type0";
_fontBBox.String = Doc.GetInfo(_state.FontID, "FontBBox");
_fontInfoID = _state.FontID;
}
long width = 0;
int i = 0, count = 0;
for(int j; (j = s.IndexOf(',', i))>=i; i = j+1, ++count) {
width += int.Parse(s.Substring(i, j-i), NumberFormatInfo.InvariantInfo);
}
i = int.Parse(s.Substring(i), NumberFormatInfo.InvariantInfo);
double right = width + Math.Max(_fontBBox.Right, i);
width += i;
++count;
double scale = _state.FontSize/1000;
right *= scale;
double advance = width*scale;
int wordSpaceCount = 0;
if(!_fontIsMultibyte && _state.WordSpacing!=0) {
for(i = 0; i<count; ++i) {
if(text[i]==' ')
++wordSpaceCount;
}
}
if(wordSpaceCount>0) {
double spacing = _state.WordSpacing*wordSpaceCount;
right += text[count-1]!=' '? spacing: spacing-_state.WordSpacing;
advance += spacing;
}
if(_state.CharSpacing!=0) {
double spacing = _state.CharSpacing*count;
if(count>1)
right += spacing-_state.CharSpacing;
advance += spacing;
}
PDFMatrix matrix = new PDFMatrix(ref _state.Matrix, ref _textMatrix);
if(_state.TextRise!=0)
matrix.Translate(0, _state.TextRise);
if(_state.HorizontalTextScale!=100) {
double hscale = _state.HorizontalTextScale/100;
matrix.Scale(hscale, 1);
advance *= hscale;
}
_textMatrix.Translate(advance, 0);
double left = _fontBBox.Left*scale;
PDFRect rect;
matrix.GetRectBounds(left, _fontBBox.Bottom*scale,
right-left, _fontBBox.Height*scale,
out rect.X, out rect.Y, out rect.Width, out rect.Height);
if(_state.LineWidth>0) {
switch(_state.TextRender) {
case TextRenderingMode.StrokeText:
case TextRenderingMode.FillThenStrokeText:
case TextRenderingMode.StrokeTextAndAddForClipping:
case TextRenderingMode.FillThenStrokeTextAndAddForClipping:
double halfWidth = _state.LineWidth/2;
double halfWidthX = halfWidth*Math.Sqrt(_state.Matrix.MultiplierXSquare);
double halfWidthY = halfWidth*Math.Sqrt(_state.Matrix.MultiplierYSquare);
rect.X -= halfWidthX;
rect.Y -= halfWidthY;
rect.Width += 2*halfWidthX;
rect.Height += 2*halfWidthY;
break;
}
}
UnionBounds(rect);
}
public override void SetFont(int fontObjID, double fontSize) {
base.SetFont(fontObjID, fontSize);
_state.FontID = fontObjID;
_state.FontSize = Math.Abs(fontSize);
}
public override void SetTextMatrix(double a, double b, double c, double d, double e, double f) {
base.SetTextMatrix(a, b, c, d, e, f);
_textMatrix.M00 = a;
_textMatrix.M01 = b;
_textMatrix.M10 = c;
_textMatrix.M11 = d;
_textMatrix.M20 = e;
_textMatrix.M21 = f;
}
public override void NextLine() {
base.NextLine();
if(_state.TextLeading!=0)
_textMatrix.Translate(0, -_state.TextLeading);
}
public override void TextMove(double tx, double ty) {
base.TextMove(tx, ty);
_textMatrix.Translate(tx, ty);
}
}
}
