net-print/cups-filters/files/cups-filters-1.23.0-pdftops-monochrome.patch

From 48f9f994322c808ba2e9d0db6f3ff81caf8c0b72 Mon Sep 17 00:00:00 2001
From: sobhaniiest <sobhaniiest@gmail.com>
Date: Fri, 3 May 2019 20:53:47 +0530
Subject: [PATCH] pdftops: Force monochrome/grayscale PostScript output if job
 is to be printed in monochrome/grayscale.

---
 filter/pdftops.c | 46 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/filter/pdftops.c b/filter/pdftops.c
index 84b2b6e3..424da2e4 100644
--- a/filter/pdftops.c
+++ b/filter/pdftops.c
@@ -304,6 +304,7 @@ main(int  argc,				/* I - Number of command-line args */
 		wait_pid,		/* Process ID from wait() */
 		wait_status,		/* Status from child */
 		exit_status = 0;	/* Exit status */
+  int gray_output = 0; /* Checking for monochrome/grayscale PostScript output */
   char		*pdf_argv[100],		/* Arguments for pdftops/gs */
 		pstops_path[1024],	/* Path to pstops program */
 		*pstops_argv[7],	/* Arguments for pstops filter */
@@ -587,6 +588,38 @@ main(int  argc,				/* I - Number of command-line args */
     log_command_line("rastertops", rastertops_argv);
   }
 
+  /*
+  * Force monochrome/grayscale PostScript output 
+  * if job is to be printed in monochrome/grayscale
+  */
+  if (ppd->color_device == 0)  /* Monochrome printer */
+    gray_output = 1;
+  else  /*Color Printer - user option for Grayscale */
+  {
+    if ((val = cupsGetOption("pwg-raster-document-type", num_options,
+               options)) != NULL ||
+      (val = cupsGetOption("PwgRasterDocumentType", num_options,
+               options)) != NULL ||
+      (val = cupsGetOption("print-color-mode", num_options,
+               options)) != NULL ||
+      (val = cupsGetOption("PrintColorMode", num_options,
+               options)) != NULL ||
+      (val = cupsGetOption("color-space", num_options,
+               options)) != NULL ||
+      (val = cupsGetOption("ColorSpace", num_options,
+               options)) != NULL ||
+      (val = cupsGetOption("color-model", num_options,
+               options)) != NULL ||
+      (val = cupsGetOption("ColorModel", num_options,
+               options)) != NULL)
+      {
+          if (strcasestr(val, "Black") ||
+              strcasestr(val, "Gray") ||
+              strcasestr(val, "Mono"))
+            gray_output = 1;
+      }
+  }
+
  /*
   * Build the command-line for the pdftops, gs, pdftocairo, or
   * acroread filter...
@@ -612,7 +645,13 @@ main(int  argc,				/* I - Number of command-line args */
 #    endif /* HAVE_GHOSTSCRIPT_PS2WRITE */
     pdf_argv[7] = (char *)"-dShowAcroForm";
     pdf_argv[8] = (char *)"-sOUTPUTFILE=%stdout";
-    pdf_argc    = 9;
+    if (gray_output == 1) /* Checking for monochrome/grayscale PostScript output */
+    {
+      pdf_argv[9] = (char *)"-sColorConversionStrategy=Gray";
+      pdf_argc = 10;
+    }
+    else
+      pdf_argc = 9;
   }
   else if (renderer == PDFTOCAIRO)
   {
@@ -851,6 +914,11 @@ main(int  argc,				/* I - Number of command-line args */
     pdf_argv[pdf_argc++] = resolution;
     fprintf(stderr, "DEBUG: Using image rendering resolution %d dpi\n", res);
 #endif /* HAVE_POPPLER_PDFTOPS_WITH_RESOLUTION */
+    if (gray_output == 1) /* Checking for monochrome/grayscale PostScript output */
+    {
+      pdf_argv[1] = (char *)"-level1";
+      pdf_argv[pdf_argc++] = (char *)"-optimizecolorspace";
+    }
     pdf_argv[pdf_argc++] = filename;
     pdf_argv[pdf_argc++] = (char *)"-";
   }