Pdf Import Rewrite
Pdf Import rewritten to greatly improve QR Code detection, reduce reliance on iTextSharp and improve thumbnails. Fixes #50
This commit is contained in:
Gary Sharp
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using System;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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namespace Disco.Services
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{
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public static class ImagingExtensions
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{
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public static Bitmap RotateImage(this Image Source, float Angle, Brush BackgroundColor = null, bool ResizeIfOver45Deg = true)
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{
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var destWidth = Source.Width;
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var destHeight = Source.Height;
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var resizedDest = false;
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if (ResizeIfOver45Deg && ((Angle > 45 && Angle < 135) || (Angle < -45 && Angle > -135)))
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{
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destWidth = Source.Height;
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destHeight = Source.Width;
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resizedDest = true;
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}
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var destination = new Bitmap(destWidth, destHeight);
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destination.SetResolution(Source.HorizontalResolution, Source.VerticalResolution);
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using (Graphics destinationGraphics = Graphics.FromImage(destination))
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{
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destinationGraphics.CompositingQuality = CompositingQuality.HighQuality;
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destinationGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
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destinationGraphics.SmoothingMode = SmoothingMode.HighQuality;
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if (BackgroundColor != null)
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destinationGraphics.FillRectangle(BackgroundColor, destinationGraphics.VisibleClipBounds);
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float offsetWidth = destWidth / 2;
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float offsetHeight = destHeight / 2;
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destinationGraphics.TranslateTransform(offsetWidth, offsetHeight);
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destinationGraphics.RotateTransform(Angle);
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RectangleF destinationLocation;
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if (resizedDest)
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destinationLocation = new RectangleF(
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offsetHeight * -1, offsetWidth * -1,
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destHeight, destWidth);
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else
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destinationLocation = new RectangleF(
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offsetWidth * -1, offsetHeight * -1,
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destWidth, destHeight);
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destinationGraphics.DrawImage(Source, destinationLocation, new RectangleF(0, 0, Source.Width, Source.Height), GraphicsUnit.Pixel);
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}
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return destination;
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}
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public static Bitmap ResizeImage(this Image Source, int TargetWidth, int TargetHeight, Brush BackgroundColor = null)
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{
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var destination = new Bitmap(TargetWidth, TargetHeight);
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destination.SetResolution(72, 72);
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using (Graphics destinationGraphics = Graphics.FromImage(destination))
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{
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destinationGraphics.CompositingQuality = CompositingQuality.HighQuality;
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destinationGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
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destinationGraphics.SmoothingMode = SmoothingMode.HighQuality;
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if (BackgroundColor != null)
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destinationGraphics.FillRectangle(BackgroundColor, destinationGraphics.VisibleClipBounds);
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destinationGraphics.DrawImageResized(Source);
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}
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return destination;
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}
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public static RectangleF CalculateResize(int SourceWidth, int SourceHeight, int TargetWidth, int TargetHeight, out float scaleRatio)
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{
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scaleRatio = Math.Min((float)(TargetWidth) / SourceWidth, (float)(TargetHeight) / SourceHeight);
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float width = SourceWidth * scaleRatio,
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height = SourceHeight * scaleRatio,
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x = 0,
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y = 0;
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if (width < TargetWidth)
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x = (TargetWidth - width) / 2;
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if (height < TargetHeight)
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y = (TargetHeight - height) / 2;
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return new RectangleF(x, y, width, height);
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}
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public static RectangleF CalculateResize(int SourceWidth, int SourceHeight, int TargetWidth, int TargetHeight)
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{
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float scaleRatio;
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return CalculateResize(SourceWidth, SourceHeight, TargetHeight, TargetHeight, out scaleRatio);
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}
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public static RectangleF CalculateResize(this Image Source, int TargetWidth, int TargetHeight, out float scaleRatio)
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{
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return CalculateResize(Source.Width, Source.Height, TargetWidth, TargetHeight, out scaleRatio);
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}
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public static RectangleF CalculateResize(this Image Source, int TargetWidth, int TargetHeight)
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{
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return CalculateResize(Source.Width, Source.Height, TargetHeight, TargetHeight);
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}
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public static void DrawImageResized(this Graphics graphics, Image SourceImage)
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{
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RectangleF clipBounds = graphics.VisibleClipBounds;
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var resizeBounds = SourceImage.CalculateResize((int)clipBounds.Width, (int)clipBounds.Height);
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graphics.DrawImage(SourceImage, resizeBounds, new RectangleF(0, 0, SourceImage.Width, SourceImage.Height), GraphicsUnit.Pixel);
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}
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public static void DrawImageResized(this Graphics graphics, Image SourceImage, float Scale, float LocationX, float LocationY)
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{
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RectangleF clipBounds = graphics.VisibleClipBounds;
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float width = SourceImage.Width * Scale,
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height = SourceImage.Height * Scale,
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x = LocationX,
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y = LocationY;
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x += clipBounds.Left;
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y += clipBounds.Top;
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graphics.DrawImage(SourceImage, new RectangleF(x, y, width, height), new RectangleF(0, 0, SourceImage.Width, SourceImage.Height), GraphicsUnit.Pixel);
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}
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public static void EmbedIconOverlay(this Image Source, Image Icon)
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{
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int top = Math.Max(0, Source.Height - Icon.Height);
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int left = Math.Max(0, Source.Width - Icon.Width);
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using (Graphics sourceGraphics = Graphics.FromImage(Source))
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{
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sourceGraphics.DrawImage(Icon, left, top);
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}
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}
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public static void SavePng(this Image Source, string Filename)
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{
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using (FileStream outStream = new FileStream(Filename, FileMode.Create, FileAccess.Write, FileShare.None))
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{
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SavePng(Source, outStream);
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outStream.Flush();
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outStream.Close();
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}
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}
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public static void SavePng(this Image Source, Stream OutStream)
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{
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Source.Save(OutStream, ImageFormat.Png);
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}
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public static Stream SavePng(this Image Source)
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{
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MemoryStream outStream = new MemoryStream();
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Source.SavePng(outStream);
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outStream.Position = 0;
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return outStream;
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}
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public static Stream SaveJpg(this Image Source, int Quality)
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{
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MemoryStream outStream = new MemoryStream();
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Source.SaveJpg(Quality, outStream);
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outStream.Position = 0;
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return outStream;
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}
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public static void SaveJpg(this Image Source, int Quality, string Filename)
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{
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using (FileStream outStream = new FileStream(Filename, FileMode.Create, FileAccess.Write, FileShare.None))
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{
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SaveJpg(Source, Quality, outStream);
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outStream.Flush();
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outStream.Close();
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}
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}
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public static void SaveJpg(this Image Source, int Quality, Stream OutStream)
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{
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ImageCodecInfo jpgCodec = ImageCodecInfo.GetImageEncoders().Where(c => c.MimeType.Equals("image/jpeg", StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
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if (jpgCodec != null)
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{
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if (Quality < 0 || Quality > 100)
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throw new ArgumentOutOfRangeException("Quality", "Quality must be a positive integer <= 100");
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using (EncoderParameters ep = new EncoderParameters(1))
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{
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ep.Param[0] = new EncoderParameter(Encoder.Quality, Quality);
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Source.Save(OutStream, jpgCodec, ep);
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}
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}
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else
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{
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// Fallback
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Source.Save(OutStream, ImageFormat.Jpeg);
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}
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}
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public static Color InterpolateColours(this Color Start, Color End, double Progress)
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{
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if (Progress > 1 || Progress < 0)
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throw new ArgumentOutOfRangeException("Progress", "Progress must be >= 0 && <= 1");
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return Color.FromArgb(
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(byte)(Start.A * (1 - Progress) + (End.A * Progress)),
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(byte)(Start.R * (1 - Progress) + (End.R * Progress)),
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(byte)(Start.G * (1 - Progress) + (End.G * Progress)),
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(byte)(Start.B * (1 - Progress) + (End.B * Progress))
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);
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}
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public static RectangleF Multiply(this RectangleF Other, float Multiplier)
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{
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return new RectangleF(Other.X * Multiplier, Other.Y * Multiplier, Other.Width * Multiplier, Other.Height * Multiplier);
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}
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public static RectangleF Divide(this RectangleF Other, float Divisor)
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{
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return new RectangleF(Other.X / Divisor, Other.Y / Divisor, Other.Width / Divisor, Other.Height / Divisor);
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}
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}
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}
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