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itext pdfimage library

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Marco Giuntoni
2024-03-01 16:00:16 +01:00
parent 4cbbee5147
commit 0c24ec1cbb
9 changed files with 502 additions and 400 deletions
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itext_pdfimage/ConvertExtensions.cs
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using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas.Parser;
using iText.Kernel.Pdf.Canvas.Parser.Listener;
using System;
using System.Collections.Generic;
using System.IO;
using iText.IO.Font;
using System.Text.RegularExpressions;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing.Text;
namespace itext.pdfimage.Extensions
{
public static class ConvertExtensions
{
public static IEnumerable<Bitmap> ConvertToBitmaps(this PdfDocument pdfDocument)
{
var converter = new PdfToImageConverter();
return converter.ConvertToBitmaps(pdfDocument);
}
public static Bitmap ConvertPageToBitmap(this PdfPage pdfPage)
{
var converter = new PdfToImageConverter();
return converter.ConvertToBitmap(pdfPage);
}
public static IEnumerable<Stream> ConvertToJpgStreams(this PdfDocument pdfDocument)
{
var converter = new PdfToImageConverter();
return converter.ConvertToJpgStreams(pdfDocument);
}
public static Stream ConvertPageToJpg(this PdfPage pdfPage)
{
var converter = new PdfToImageConverter();
return converter.ConvertToJpgStream(pdfPage);
}
internal static FontStyle GetFontStyle(this FontNames fontNames)
{
var fontname = fontNames.GetFontName();
var fontStyleRegex = Regex.Match(fontname, @"[-,][\w\s]+$");
if (fontStyleRegex.Success)
{
var result = fontStyleRegex.Value.ToLower();
if (result.Contains("bold"))
{
return FontStyle.Bold;
}
}
return FontStyle.Regular;
}
}
}
itext_pdfimage/IChunk.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace itext.pdfimage.Models
{
public interface IChunk
{
}
}
itext_pdfimage/ImageChunk.cs
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using System.Drawing;
namespace itext.pdfimage.Models
{
public class ImageChunk : IChunk
{
public float X { get; set; }
public float Y { get; set; }
public float W { get; set; }
public float H { get; set; }
public Image Image { get; set; }
}
}
itext_pdfimage/ImageListener.cs
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using iText.Kernel.Pdf.Canvas.Parser.Data;
using itext.pdfimage.Models;
using System.Collections.Generic;
using System.IO;
using System;
using System.Drawing;
using iText.Kernel.Pdf.Xobject;
using System.Drawing.Imaging;
namespace iText.Kernel.Pdf.Canvas.Parser.Listener
{
public class ImageListener : FilteredEventListener
{
private readonly SortedDictionary<float, IChunk> chunkDictionairy;
private Func<float> increaseCounter;
public ImageListener(SortedDictionary<float, IChunk> chunkDictionairy, Func<float> increaseCounter)
{
this.chunkDictionairy = chunkDictionairy;
this.increaseCounter = increaseCounter;
}
public override void EventOccurred(IEventData data, EventType type)
{
if (type != EventType.RENDER_IMAGE) return;
float counter = increaseCounter();
var renderInfo = (ImageRenderInfo)data;
var imageObject = renderInfo.GetImage();
Bitmap image;
try
{
var imageBytes = imageObject.GetImageBytes();
image = new Bitmap(new MemoryStream(imageBytes));
}
catch
{
return;
}
var smask = imageObject.GetPdfObject().GetAsStream(PdfName.SMask);
if (smask != null)
{
try
{
var maskImageObject = new PdfImageXObject(smask);
var maskBytes = maskImageObject.GetImageBytes();
using (var maskImage = new Bitmap(new MemoryStream(maskBytes)))
{
image = GenerateMaskedImage(image, maskImage);
}
}
catch { }
}
var matix = renderInfo.GetImageCtm();
var imageChunk = new ImageChunk
{
X = matix.Get(Geom.Matrix.I31),
Y = matix.Get(Geom.Matrix.I32),
W = matix.Get(Geom.Matrix.I11),
H = matix.Get(Geom.Matrix.I22),
Image = image
};
chunkDictionairy.Add(counter, imageChunk);
base.EventOccurred(data, type);
}
private Bitmap GenerateMaskedImage(Bitmap image, Bitmap mask)
{
var output = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb);
var rect = new Rectangle(0, 0, image.Width, image.Height);
var bitsMask = mask.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
var bitsInput = image.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
var bitsOutput = output.LockBits(rect, ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
unsafe
{
for (int y = 0; y < image.Height; y++)
{
byte* ptrMask = (byte*)bitsMask.Scan0 + y * bitsMask.Stride;
byte* ptrInput = (byte*)bitsInput.Scan0 + y * bitsInput.Stride;
byte* ptrOutput = (byte*)bitsOutput.Scan0 + y * bitsOutput.Stride;
for (int x = 0; x < image.Width; x++)
{
ptrOutput[4 * x] = ptrInput[4 * x]; // blue
ptrOutput[4 * x + 1] = ptrInput[4 * x + 1]; // green
ptrOutput[4 * x + 2] = ptrInput[4 * x + 2]; // red
ptrOutput[4 * x + 3] = ptrMask[4 * x]; // alpha
}
}
}
mask.UnlockBits(bitsMask);
image.UnlockBits(bitsInput);
output.UnlockBits(bitsOutput);
return output;
}
}
}
itext_pdfimage/MeasuringExtensions.cs
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using System;
using System.Collections.Generic;
using System.Text;
namespace itext.pdfimage.Extensions
{
public static class MeasuringExtensions
{
//72 points == 1
//72px x 72px is 1inch x 1inch at a 72dpi resolution
public static int Dpi { get; set; } = 300;
public static float PixelsToPoints(this float value, int? dpi = null)
{
return value / (dpi ?? Dpi) * 72;
}
public static int PointsToPixels(this int value, int? dpi = null)
{
return PointsToPixels((float)value);
}
public static int PointsToPixels(this float value, int? dpi = null)
{
return (int)(value * (dpi ?? Dpi) / 72);
}
}
}
itext_pdfimage/PdfToImageConverter.cs
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using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas.Parser;
using iText.Kernel.Pdf.Canvas.Parser.Listener;
using System;
using System.Collections.Generic;
using System.IO;
using itext.pdfimage.Models;
using itext.pdfimage.Extensions;
using System.Threading;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing.Text;
namespace itext.pdfimage
{
public class PdfToImageConverter
{
private static int counter;
public IEnumerable<Bitmap> ConvertToBitmaps(PdfDocument pdfDocument)
{
counter = 0;
var numberOfPages = pdfDocument.GetNumberOfPages();
for (var i = 1; i <= numberOfPages; i++)
{
var currentPage = pdfDocument.GetPage(i);
yield return ConvertToBitmap(currentPage);
}
}
public IEnumerable<Stream> ConvertToJpgStreams(PdfDocument pdfDocument)
{
foreach (var bmp in ConvertToBitmaps(pdfDocument))
{
using (var ms = new MemoryStream())
{
bmp.Save(ms, ImageFormat.Jpeg);
yield return ms;
}
bmp.Dispose();
}
}
public Bitmap ConvertToBitmap(PdfPage pdfPage)
{
var rotation = pdfPage.GetRotation();
var chunkDictionairy = new SortedDictionary<float, IChunk>();
FilteredEventListener listener = new FilteredEventListener();
listener.AttachEventListener(new TextListener(chunkDictionairy, IncreaseCounter));
listener.AttachEventListener(new ImageListener(chunkDictionairy, IncreaseCounter));
PdfCanvasProcessor processor = new PdfCanvasProcessor(listener);
processor.ProcessPageContent(pdfPage);
//var size = currentPage.GetPageSizeWithRotation();
var size = pdfPage.GetPageSize();
var width = size.GetWidth().PointsToPixels();
var height = size.GetHeight().PointsToPixels();
Bitmap bmp = new Bitmap(width, height);
using (Graphics g = Graphics.FromImage(bmp))
{
g.FillRectangle(Brushes.White, 0, 0, bmp.Width, bmp.Height);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;
foreach (var chunk in chunkDictionairy)
{
g.ResetTransform();
g.RotateTransform(-rotation);
if (chunk.Value is Models.ImageChunk imageChunk)
{
var imgW = imageChunk.W.PointsToPixels();
var imgH = imageChunk.H.PointsToPixels();
var imgX = imageChunk.X.PointsToPixels();
var imgY = (size.GetHeight() - imageChunk.Y - imageChunk.H).PointsToPixels();
g.TranslateTransform(imgX, imgY, MatrixOrder.Append);
g.DrawImage(imageChunk.Image, 0, 0, imgW, imgH);
imageChunk.Image.Dispose();
}
else if (chunk.Value is Models.TextChunk textChunk)
{
var chunkX = textChunk.Rect.GetX().PointsToPixels();
var chunkY = bmp.Height - textChunk.Rect.GetY().PointsToPixels();
var fontSize = textChunk.FontSize.PointsToPixels();
Font font;
try
{
font = new Font(textChunk.FontFamily, fontSize, textChunk.FontStyle, GraphicsUnit.Pixel);
}
catch (Exception ex)
{
//log error
font = new Font("Calibri", 11, textChunk.FontStyle, GraphicsUnit.Pixel);
}
g.TranslateTransform(chunkX, chunkY, MatrixOrder.Append);
//g.DrawString(textChunk.Text, font, new SolidBrush(textChunk.Color), chunkX, chunkY);
g.DrawString(textChunk.Text, font, new SolidBrush(textChunk.Color), 0, 0);
}
}
g.Flush();
}
return bmp;
}
public Stream ConvertToJpgStream(PdfPage pdfPage)
{
var bmp = ConvertToBitmap(pdfPage);
var ms = new MemoryStream();
bmp.Save(ms, ImageFormat.Jpeg);
bmp.Dispose();
return ms;
}
private Func<float> IncreaseCounter = () => counter = Interlocked.Increment(ref counter);
}
}
itext_pdfimage/TextChunk.cs
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using System.Drawing;
namespace itext.pdfimage.Models
{
public class TextChunk : IChunk
{
public string Text { get; set; }
public iText.Kernel.Geom.Rectangle Rect { get; set; }
public string FontFamily { get; set; }
public int FontSize { get; set; }
public FontStyle FontStyle { get; set; }
public float SpaceWidth { get; set; }
public Color Color { get; internal set; }
}
}
itext_pdfimage/TextListener.cs
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using iText.Kernel.Geom;
using iText.Kernel.Pdf.Canvas.Parser.Data;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using itext.pdfimage.Extensions;
using itext.pdfimage.Models;
using System;
using System.Drawing;
namespace iText.Kernel.Pdf.Canvas.Parser.Listener
{
public class TextListener : LocationTextExtractionStrategy
{
private readonly SortedDictionary<float, IChunk> chunkDictionairy;
private Func<float> increaseCounter;
public TextListener(SortedDictionary<float, IChunk> chunkDictionairy, Func<float> increaseCounter)
{
this.chunkDictionairy = chunkDictionairy;
this.increaseCounter = increaseCounter;
}
public override void EventOccurred(IEventData data, EventType type)
{
return;
if (!type.Equals(EventType.RENDER_TEXT)) return;
TextRenderInfo renderInfo = (TextRenderInfo)data;
float counter = increaseCounter();
var font = renderInfo.GetFont().GetFontProgram();
var originalFontName = font.ToString();
var fontRegex = Regex.Match(originalFontName, @"(?<=\+)[a-zA-Z\s]+");
string fontName = fontRegex.Success ? fontRegex.Value : originalFontName;
var fontStyle = font.GetFontNames().GetFontStyle();
float curFontSize = renderInfo.GetFontSize();
float key = counter;
IList<TextRenderInfo> text = renderInfo.GetCharacterRenderInfos();
foreach (TextRenderInfo character in text)
{
key += 0.001f;
var textRenderMode = character.GetTextRenderMode();
var opacity = character.GetGraphicsState().GetFillOpacity();
//if (textRenderMode != 0 || opacity != 1)
//{
//}
string letter = character.GetText();
Color color;
var fillColor = character.GetFillColor();
var colors = fillColor.GetColorValue();
if(colors.Length == 1)
{
color = Color.FromArgb((int)(255 * (1 - colors[0])), Color.Black);
}
else if (colors.Length == 3)
{
color = Color.FromArgb((int)(255 * colors[0]), (int)(255 * colors[1]), (int)(255 * colors[2]));
}
else if (colors.Length == 4)
{
color = Color.FromArgb((int)(255 * colors[0]), (int)(255 * colors[1]), (int)(255 * colors[2]), (int)(255 * colors[3]));
}
else
{
color = Color.Black;
}
//if(letter == "A")
//{
//}
if (string.IsNullOrWhiteSpace(letter)) continue;
//Get the bounding box for the chunk of text
var bottomLeft = character.GetDescentLine().GetStartPoint();
var topRight = character.GetAscentLine().GetEndPoint();
//Create a rectangle from it
var rect = new Geom.Rectangle(
bottomLeft.Get(Vector.I1),
topRight.Get(Vector.I2),
topRight.Get(Vector.I1),
topRight.Get(Vector.I2)
);
var currentChunk = new itext.pdfimage.Models.TextChunk()
{
Text = letter,
Rect = rect,
FontFamily = fontName,
FontSize = (int)curFontSize,
FontStyle = fontStyle,
Color = color,
SpaceWidth = character.GetSingleSpaceWidth() / 2f
};
chunkDictionairy.Add(key, currentChunk);
}
base.EventOccurred(data, type);
}
}
}