Printing: Use –FPDF_RenderPage instead of FPDF_RenderPageBitmap to allow vector graphics

Elwig/Elwig.csproj

@@ -23,7 +23,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="bblanchon.PDFium.Win32" Version="153.0.7988" />
+    <PackageReference Include="bblanchon.PDFium.Win32" Version="153.0.7999" />
     <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.2" />
     <PackageReference Include="itext" Version="9.7.0" />
     <PackageReference Include="itext.bouncy-castle-adapter" Version="9.7.0" />

Elwig/Helpers/Printing/Pdf.cs

@@ -1,7 +1,6 @@
 using Elwig.Services;
 using Elwig.Windows;
 using System;
-using System.Drawing.Printing;
 using System.Threading.Tasks;
 
 namespace Elwig.Helpers.Printing {
@@ -32,20 +31,10 @@ namespace Elwig.Helpers.Printing {
             });
         }
 
-        public static async Task Print(string path, int copies = 1, bool doublePaged = false) {
+        public static Task Print(string path, int copies = 1, bool doublePaged = false) {
-            await Print(path, new() {
-                Copies = (short)copies,
-                Collate = true,
-                Duplex = doublePaged ? Duplex.Vertical : Duplex.Simplex,
-            });
-        }
-
-        public static Task Print(string path, PrinterSettings settings) {
             try {
-                using var printDoc = new PdfPrintDocument(path) {
+                var printer = new PdfPrinter();
-                    PrinterSettings = settings,
+                printer.Print(path, copies, doublePaged);
-                };
-                printDoc.Print();
             } catch (Exception exc) {
                 InteractionService.ShowException("Fehler beim Drucken", "Beim Drucken ist ein Fehler aufgetreten", exc);
             }

Elwig/Helpers/Printing/PdfPrintDocument.cs

@@ -1,103 +0,0 @@
-using System;
-using System.Drawing;
-using System.Drawing.Imaging;
-using System.Drawing.Printing;
-using System.Runtime.InteropServices;
-
-namespace Elwig.Helpers.Printing {
-    public class PdfPrintDocument : PrintDocument {
-
-        private readonly IntPtr _handle;
-        private readonly int _pageCount;
-
-        private int _currentPage;
-
-        public PdfPrintDocument(string path, string? password = null) :
-            base() {
-            _handle = PdfiumNative.FPDF_LoadDocument(path, password);
-            _pageCount = PdfiumNative.FPDF_GetPageCount(_handle);
-        }
-
-        protected override void Dispose(bool disposing) {
-            PdfiumNative.FPDF_CloseDocument(_handle);
-            base.Dispose(disposing);
-        }
-
-        protected override void OnBeginPrint(PrintEventArgs evt) {
-            _currentPage = (PrinterSettings.FromPage != 0) ? (PrinterSettings.FromPage - 1) : 0;
-            base.OnBeginPrint(evt);
-        }
-
-        protected override void OnPrintPage(PrintPageEventArgs evt) {
-            if (_currentPage < _pageCount) {
-                IntPtr page = PdfiumNative.FPDF_LoadPage(_handle, _currentPage);
-                double width = PdfiumNative.FPDF_GetPageWidth(page);
-                double height = PdfiumNative.FPDF_GetPageHeight(page);
-                int pixelWidth = (int)(width / 72.0 * (evt.Graphics?.DpiX ?? 300.0));
-                int pixelHeight = (int)(height / 72.0 * (evt.Graphics?.DpiY ?? 300.0));
-
-                IntPtr bitmap = PdfiumNative.FPDFBitmap_Create(pixelWidth, pixelHeight, 1);
-                PdfiumNative.FPDF_RenderPageBitmap(bitmap, page, 0, 0, pixelWidth, pixelHeight, 0, 0);
-
-                IntPtr buffer = PdfiumNative.FPDFBitmap_GetBuffer(bitmap);
-                int stride = PdfiumNative.FPDFBitmap_GetStride(bitmap);
-                using (var bmp = new Bitmap(pixelWidth, pixelHeight, stride, PixelFormat.Format32bppArgb, buffer)) {
-                    evt.Graphics?.TranslateTransform(
-                        -evt.PageSettings.HardMarginX,
-                        -evt.PageSettings.HardMarginY);
-                    evt.Graphics?.DrawImage(bmp, new RectangleF(0, 0, (float)(width / 72.0 * 100.0), (float)(height / 72.0 * 100.0)));
-                }
-                _currentPage++;
-
-                PdfiumNative.FPDFBitmap_Destroy(bitmap);
-                PdfiumNative.FPDF_ClosePage(page);
-            }
-            evt.HasMorePages = _currentPage < ((PrinterSettings.ToPage == 0) ? _pageCount : Math.Min(PrinterSettings.ToPage, _pageCount));
-            base.OnPrintPage(evt);
-        }
-    }
-
-    internal partial class PdfiumNative {
-        [LibraryImport("pdfium.dll")]
-        public static partial void FPDF_InitLibrary();
-
-        [LibraryImport("pdfium.dll")]
-        public static partial void FPDF_DestroyLibrary();
-
-        [LibraryImport("pdfium.dll", StringMarshalling = StringMarshalling.Utf8)]
-        public static partial IntPtr FPDF_LoadDocument(string filePath, string? password);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial void FPDF_CloseDocument(IntPtr document);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial int FPDF_GetPageCount(IntPtr document);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial IntPtr FPDF_LoadPage(IntPtr document, int pageIndex);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial void FPDF_ClosePage(IntPtr page);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial double FPDF_GetPageWidth(IntPtr page);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial double FPDF_GetPageHeight(IntPtr page);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial IntPtr FPDFBitmap_Create(int width, int height, int alpha);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial void FPDFBitmap_Destroy(IntPtr bitmap);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial IntPtr FPDFBitmap_GetBuffer(IntPtr bitmap);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial int FPDFBitmap_GetStride(IntPtr bitmap);
-
-        [LibraryImport("pdfium.dll")]
-        public static partial void FPDF_RenderPageBitmap(IntPtr bitmap, IntPtr page, int start_x, int start_y, int size_x, int size_y, int rotate, int flags);
-    }
-}

Elwig/Helpers/Printing/PdfPrinter.cs

@@ -0,0 +1,94 @@
+using System;
+using System.IO;
+using System.Printing;
+
+namespace Elwig.Helpers.Printing {
+    public class PdfPrinter {
+
+        public string PrinterName { get; init; }
+
+        public PdfPrinter(string? printerName = null) {
+            PrinterName = printerName ?? GetDefaultPrinterName() ?? throw new InvalidOperationException("No default Windows printer is configured.");
+        }
+
+        public void Print(string pdfPath, int copies = 1, bool doublePaged = false) {
+            if (!File.Exists(pdfPath)) throw new FileNotFoundException("PDF file not found.", pdfPath);
+
+            IntPtr document = PdfiumNative.FPDF_LoadDocument(pdfPath, null);
+            if (document == IntPtr.Zero) throw new InvalidOperationException("PDFium could not open the PDF.");
+
+            try {
+                int pageCount = PdfiumNative.FPDF_GetPageCount(document);
+                if (pageCount <= 0)
+                    return;
+
+                using var printer = new Win32Printer.Printer(PrinterName);
+                printer.TrySetDuplex(doublePaged ? Duplexing.TwoSidedLongEdge : Duplexing.OneSided);
+                for (int i = 0; i < copies; i++) {
+                    printer.StartDocument(Path.GetFileName(pdfPath));
+                    bool documentStarted = true;
+                    try {
+                        for (int j = 0; j < pageCount; j++) {
+                            PrintPage(document, printer, j);
+                        }
+                        printer.EndDocument();
+                        documentStarted = false;
+                    } finally {
+                        if (documentStarted) printer.AbortDocument();
+                    }
+                }
+            } finally {
+                PdfiumNative.FPDF_CloseDocument(document);
+            }
+        }
+
+        private static void PrintPage(IntPtr document, Win32Printer.Printer printer, int pageIndex) {
+            if (!PdfiumNative.FPDF_GetPageSizeByIndex(document, pageIndex, out double pageWidthPt, out double pageHeightPt)) {
+                throw new InvalidOperationException($"Unable to obtain PDF page {pageIndex} size.");
+            }
+
+            IntPtr page = PdfiumNative.FPDF_LoadPage(document, pageIndex);
+            if (page == IntPtr.Zero)
+                throw new InvalidOperationException($"Unable to load PDF page {pageIndex}.");
+
+            try {
+                // PDF coordinates are points (1/72 inch).
+                //
+                // HORZRES/VERTRES are the printable area in
+                // device pixels for the current printer DC.
+                int widthPx = printer.PixelWidth;
+                int heightPx = printer.PixelHeight;
+
+                // Preserve aspect ratio.
+                double scaleX = widthPx / pageWidthPt;
+                double scaleY = heightPx / pageHeightPt;
+                double scale = Math.Min(scaleX, scaleY);
+                int renderWidth = Math.Max(1, (int)Math.Round(pageWidthPt * scale));
+                int renderHeight = Math.Max(1, (int)Math.Round(pageHeightPt * scale));
+                int offsetX = (widthPx - renderWidth) / 2;
+                int offsetY = (heightPx - renderHeight) / 2;
+
+                printer.StartPage();
+                try {
+                    PdfiumNative.FPDF_RenderPage(printer.Hdc, page, offsetX, offsetY, renderWidth, renderHeight, 0, PdfiumNative.FPDF_PRINTING | PdfiumNative.FPDF_ANNOT);
+                } finally {
+                    printer.EndPage();
+                }
+            } finally {
+                PdfiumNative.FPDF_ClosePage(page);
+            }
+        }
+
+        private static string? GetDefaultPrinterName() {
+            using var key = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows NT\CurrentVersion\Windows");
+            string? printer = key?.GetValue("Device") as string;
+            if (string.IsNullOrWhiteSpace(printer))
+                return null;
+
+            // Device has the form:
+            // Printer Name,winspool,PORT
+            int comma = printer.IndexOf(',');
+            return comma >= 0 ? printer[..comma] : printer;
+        }
+    }
+}

Elwig/Helpers/Printing/PdfiumNative.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Elwig.Helpers.Printing {
+    internal partial class PdfiumNative {
+
+        public const int FPDF_ANNOT = 0x01;
+        public const int FPDF_PRINTING = 0x800;
+
+        [LibraryImport("pdfium.dll")]
+        public static partial void FPDF_InitLibrary();
+
+        [LibraryImport("pdfium.dll")]
+        public static partial void FPDF_DestroyLibrary();
+
+        [LibraryImport("pdfium.dll", StringMarshalling = StringMarshalling.Utf8)]
+        public static partial IntPtr FPDF_LoadDocument(string filePath, string? password);
+
+        [LibraryImport("pdfium.dll")]
+        public static partial void FPDF_CloseDocument(IntPtr document);
+
+        [LibraryImport("pdfium.dll")]
+        public static partial int FPDF_GetPageCount(IntPtr document);
+
+        [LibraryImport("pdfium.dll")]
+        public static partial IntPtr FPDF_LoadPage(IntPtr document, int pageIndex);
+
+        [LibraryImport("pdfium.dll")]
+        public static partial void FPDF_ClosePage(IntPtr page);
+
+        [LibraryImport("pdfium.dll")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        public static partial bool FPDF_GetPageSizeByIndex(IntPtr document, int pageIndex, out double width, out double height);
+
+        [LibraryImport("pdfium.dll")]
+        public static partial void FPDF_RenderPage(IntPtr hdc, IntPtr page, int startX, int startY, int sizeX, int sizeY, int rotate, int flags);
+    }
+}

Elwig/Helpers/Printing/Win32Printer.cs

@@ -0,0 +1,229 @@
+using System;
+using System.ComponentModel;
+using System.Printing;
+using System.Runtime.InteropServices;
+
+namespace Elwig.Helpers.Printing {
+    public partial class Win32Printer {
+
+        private const int DM_OUT_BUFFER = 2;
+
+        private const int HORZRES = 8;
+        private const int VERTRES = 10;
+        private const int LOGPIXELSX = 88;
+        private const int LOGPIXELSY = 90;
+
+        private const int DM_DUPLEX = 0x1000;
+        private const short DMDUP_SIMPLEX = 1;
+        private const short DMDUP_VERTICAL = 2;
+        private const short DMDUP_HORIZONTAL = 3;
+
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        private struct DOCINFO {
+            public int cbSize;
+
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string? lpszDocName;
+
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string? lpszOutput;
+
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string? lpszDatatype;
+        }
+
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        private struct DEVMODE {
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
+            public string dmDeviceName;
+
+            public short dmSpecVersion;
+            public short dmDriverVersion;
+            public short dmSize;
+            public short dmDriverExtra;
+            public int dmFields;
+
+            public short dmOrientation;
+            public short dmPaperSize;
+            public short dmPaperLength;
+            public short dmPaperWidth;
+            public short dmScale;
+            public short dmCopies;
+            public short dmDefaultSource;
+            public short dmPrintQuality;
+            public short dmColor;
+            public short dmDuplex;
+            public short dmYResolution;
+            public short dmTTOption;
+            public short dmCollate;
+
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
+            public string dmFormName;
+
+            public short dmLogPixels;
+            public int dmBitsPerPel;
+            public int dmPelsWidth;
+            public int dmPelsHeight;
+            public int dmDisplayFlags;
+            public int dmDisplayFrequency;
+            public int dmICMMethod;
+            public int dmICMIntent;
+            public int dmMediaType;
+            public int dmDitherType;
+            public int dmReserved1;
+            public int dmReserved2;
+            public int dmPanningWidth;
+            public int dmPanningHeight;
+        }
+
+        [DllImport("winspool.drv", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern bool OpenPrinter(string pPrinterName, out IntPtr phPrinter, IntPtr pDefault);
+
+        [DllImport("winspool.drv", SetLastError = true)]
+        private static extern bool ClosePrinter(IntPtr hPrinter);
+
+        [DllImport("winspool.drv", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern int DocumentProperties(IntPtr hwnd, IntPtr hPrinter, string pDeviceName, IntPtr pDevModeOutput, IntPtr pDevModeInput, int fMode);
+
+        [DllImport("gdi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern IntPtr CreateDC(string? pDriver, string? pDevice, string? pOutput, IntPtr pInitData);
+
+        [DllImport("gdi32.dll", SetLastError = true)]
+        private static extern bool DeleteDC(IntPtr hdc);
+
+        [DllImport("gdi32.dll", SetLastError = true)]
+        private static extern int GetDeviceCaps(IntPtr hdc, int index);
+
+        [DllImport("gdi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern int StartDoc(IntPtr hdc, ref DOCINFO lpdi);
+
+        [DllImport("gdi32.dll", SetLastError = true)]
+        private static extern int EndDoc(IntPtr hdc);
+
+        [DllImport("gdi32.dll", SetLastError = true)]
+        private static extern int AbortDoc(IntPtr hdc);
+
+        [DllImport("gdi32.dll", SetLastError = true)]
+        private static extern int StartPage(IntPtr hdc);
+
+        [DllImport("gdi32.dll", SetLastError = true)]
+        private static extern int EndPage(IntPtr hdc);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern IntPtr GlobalAlloc(uint uFlags, UIntPtr dwBytes);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern IntPtr GlobalFree(IntPtr hMem);
+
+        [DllImport("kernel32.dll")]
+        private static extern IntPtr GlobalLock(IntPtr hMem);
+
+        [DllImport("kernel32.dll")]
+        private static extern bool GlobalUnlock(IntPtr hMem);
+
+        public class Printer : IDisposable {
+            private readonly string _printerName;
+            private readonly IntPtr _printerHandle;
+            private readonly IntPtr _devMode;
+            private readonly IntPtr _hdc;
+
+            public IntPtr Hdc => _hdc;
+
+            public int PixelWidth => GetDeviceCaps(_hdc, HORZRES);
+            public int PixelHeight => GetDeviceCaps(_hdc, VERTRES);
+            public int DpiX => GetDeviceCaps(_hdc, LOGPIXELSX);
+            public int DpiY => GetDeviceCaps(_hdc, LOGPIXELSY);
+
+            public Printer(string printerName) {
+                _printerName = printerName;
+
+                if (!OpenPrinter(_printerName, out _printerHandle, IntPtr.Zero)) {
+                    throw new Win32Exception(Marshal.GetLastWin32Error(), $"Unable to open printer '{printerName}'.");
+                }
+
+                try {
+                    _devMode = CreateDevMode();
+                    _hdc = CreateDC(null, _printerName, null, _devMode);
+                    if (_hdc == IntPtr.Zero)
+                        throw new Win32Exception(Marshal.GetLastWin32Error(), $"Unable to create printer DC for '{_printerName}'.");
+                } catch {
+                    if (_devMode != IntPtr.Zero) Marshal.FreeHGlobal(_devMode);
+                    ClosePrinter(_printerHandle);
+                    throw;
+                }
+            }
+
+            public bool TrySetDuplex(Duplexing duplex) {
+                var devMode = Marshal.PtrToStructure<DEVMODE>(_devMode);
+                if ((devMode.dmFields & DM_DUPLEX) != 0) {
+                    switch (duplex) {
+                        case Duplexing.OneSided: devMode.dmDuplex = DMDUP_SIMPLEX; break;
+                        case Duplexing.TwoSidedShortEdge: devMode.dmDuplex = DMDUP_HORIZONTAL; break;
+                        case Duplexing.TwoSidedLongEdge: devMode.dmDuplex = DMDUP_VERTICAL; break;
+                    }
+                    Marshal.StructureToPtr(devMode, _devMode, false);
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+
+            private IntPtr CreateDevMode() {
+                int size = DocumentProperties(IntPtr.Zero, _printerHandle, _printerName, IntPtr.Zero, IntPtr.Zero, 0);
+                if (size <= 0)
+                    throw new Win32Exception(Marshal.GetLastWin32Error(), "DocumentProperties failed.");
+
+                IntPtr devMode = Marshal.AllocHGlobal(size);
+                int result = DocumentProperties(IntPtr.Zero, _printerHandle, _printerName, devMode, IntPtr.Zero, DM_OUT_BUFFER);
+                if (result < 0) {
+                    Marshal.FreeHGlobal(devMode);
+                    throw new Win32Exception(Marshal.GetLastWin32Error(), "Unable to obtain printer DEVMODE.");
+                }
+
+                return devMode;
+            }
+
+            public void StartDocument(string documentName) {
+                var docInfo = new DOCINFO {
+                    cbSize = Marshal.SizeOf<DOCINFO>(),
+                    lpszDocName = documentName,
+                    lpszDatatype = null,
+                    lpszOutput = null
+                };
+
+                if (StartDoc(_hdc, ref docInfo) <= 0)
+                    throw new Win32Exception(Marshal.GetLastWin32Error(), "StartDoc failed.");
+            }
+
+            public void StartPage() {
+                if (Win32Printer.StartPage(_hdc) <= 0)
+                    throw new Win32Exception(Marshal.GetLastWin32Error(), "StartPage failed.");
+            }
+
+            public void EndPage() {
+                if (Win32Printer.EndPage(_hdc) <= 0)
+                    throw new Win32Exception(Marshal.GetLastWin32Error(), "EndPage failed.");
+            }
+
+            public void EndDocument() {
+                if (EndDoc(_hdc) <= 0)
+                    throw new Win32Exception( Marshal.GetLastWin32Error(), "EndDoc failed.");
+            }
+
+            public void AbortDocument() {
+                AbortDoc(_hdc);
+            }
+
+            public void Dispose() {
+                if (_hdc != IntPtr.Zero)
+                    DeleteDC(_hdc);
+
+                if (_devMode != IntPtr.Zero)
+                    Marshal.FreeHGlobal(_devMode);
+
+                if (_printerHandle != IntPtr.Zero)
+                    ClosePrinter(_printerHandle);
+            }
+        }
+    }
+}