Fix for 687055

Fix for 687055 pdfwrite should not fail with <</ProcessColorModel /DeviceN>>
setpagedevice.  This change adds support for the DeviceN process color
model to the pdfwrite device.  The DeviceN process color model is treated
like the DeviceCMYK process color model except for the name.


Dan

Index: src/gdevpdf.c
===================================================================
RCS file: /cvs/ghostscript/gs/src/gdevpdf.c,v
retrieving revision 1.71
diff -c -5 -r1.71 gdevpdf.c
*** src/gdevpdf.c	8 Sep 2003 11:45:08 -0000	1.71
--- src/gdevpdf.c	9 Oct 2003 04:23:15 -0000
***************
*** 420,481 ****
     to ignore this.
   */
  #pragma optimize save
  #pragma optimize ansi_alias=off
  #endif
! /* Update the color mapping procedures after setting ProcessColorModel. */
  void
  pdf_set_process_color_model(gx_device_pdf * pdev, int index)
  {

!     static gx_device_color_info pcm_color_info[] = {
! 	dci_values(1, 8, 255, 0, 256, 0),
! 	dci_values(3, 24, 255, 255, 256, 256),
! 	dci_values(4, 32, 255, 255, 256, 256)
      };

-     pcm_color_info[0].separable_and_linear = GX_CINFO_SEP_LIN;
-     pcm_color_info[1].separable_and_linear = GX_CINFO_SEP_LIN;
-     pcm_color_info[2].separable_and_linear = GX_CINFO_SEP_LIN;
-     pdev->color_info = pcm_color_info[index];
      pdev->pcm_color_info_index = index;
      /*
       * The conversion from PS to PDF should be transparent as possible.
       * Particularly it should not change representation of colors.
       * Perhaps due to historical reasons the source color information
       * sometimes isn't accessible from device methods, and
       * therefore they perform a mapping of colors to
       * an output color model. Here we handle some color models,
       * which were selected almost due to antique reasons.
       */
!     if (!strcmp(pdev->color_info.cm_name, "DeviceGray")) {
! 	set_dev_proc(pdev, map_rgb_color, gx_default_gray_map_rgb_color);
! 	set_dev_proc(pdev, map_color_rgb, gx_default_gray_map_color_rgb);
! 	set_dev_proc(pdev, map_cmyk_color, NULL);
!         set_dev_proc(pdev, get_color_mapping_procs,
gx_default_DevGray_get_color_mapping_procs);
!         set_dev_proc(pdev, get_color_comp_index,
gx_default_DevGray_get_color_comp_index);
!         set_dev_proc(pdev, encode_color, gx_default_gray_encode);
!         set_dev_proc(pdev, decode_color, gx_default_decode_color);
!     } else if (!strcmp(pdev->color_info.cm_name, "DeviceRGB")) {
! 	set_dev_proc(pdev, map_rgb_color, gx_default_rgb_map_rgb_color);
! 	set_dev_proc(pdev, map_color_rgb, gx_default_rgb_map_color_rgb);
! 	set_dev_proc(pdev, map_cmyk_color, NULL);
!         set_dev_proc(pdev, get_color_mapping_procs,
gx_default_DevRGB_get_color_mapping_procs);
!         set_dev_proc(pdev, get_color_comp_index,
gx_default_DevRGB_get_color_comp_index);
!         set_dev_proc(pdev, encode_color, gx_default_rgb_map_rgb_color);
!         set_dev_proc(pdev, decode_color, gx_default_rgb_map_color_rgb);
!     } else if (!strcmp(pdev->color_info.cm_name, "DeviceCMYK")) {
! 	set_dev_proc(pdev, map_rgb_color, NULL);
! 	set_dev_proc(pdev, map_color_rgb, cmyk_8bit_map_color_rgb);
!        /* possible problems with aliassing on next statement */
! 	set_dev_proc(pdev, map_cmyk_color, cmyk_8bit_map_cmyk_color);
!         set_dev_proc(pdev, get_color_mapping_procs,
gx_default_DevCMYK_get_color_mapping_procs);
!         set_dev_proc(pdev, get_color_comp_index,
gx_default_DevCMYK_get_color_comp_index);
!         set_dev_proc(pdev, encode_color, cmyk_8bit_map_cmyk_color);
!         set_dev_proc(pdev, decode_color, cmyk_8bit_map_color_rgb);
!     } else {	/* can't happen - see the call from gdev_pdf_put_params. */
!  	DO_NOTHING;
      }
  }
  #ifdef __DECC
  #pragma optimize restore
  #endif
--- 420,502 ----
     to ignore this.
   */
  #pragma optimize save
  #pragma optimize ansi_alias=off
  #endif
! /*
!  * Update the color mapping procedures after setting ProcessColorModel.
!  *
!  * The 'index' value indicates the ProcessColorModel.
!  *	0 = DeviceGray
!  *	1 = DeviceRGB
!  *	2 = DeviceCMYK
!  *	3 = DeviceN (treat like CMYK except for color model name)
!  */
  void
  pdf_set_process_color_model(gx_device_pdf * pdev, int index)
  {

!     const static gx_device_color_info pcm_color_info[] = {
! 	dci_values(1, 8, 255, 0, 256, 0),		/* Gray */
! 	dci_values(3, 24, 255, 255, 256, 256),		/* RGB */
! 	dci_values(4, 32, 255, 255, 256, 256),		/* CMYK */
! 	dci_values(4, 32, 255, 255, 256, 256)	/* Treat DeviceN like CMYK */
      };

      pdev->pcm_color_info_index = index;
+     pdev->color_info = pcm_color_info[index];
+     /* Set the separable and linear shift, masks, bits. */
+     set_linear_color_bits_mask_shift((gx_device *)pdev);
+     pdev->color_info.separable_and_linear = GX_CINFO_SEP_LIN;
      /*
       * The conversion from PS to PDF should be transparent as possible.
       * Particularly it should not change representation of colors.
       * Perhaps due to historical reasons the source color information
       * sometimes isn't accessible from device methods, and
       * therefore they perform a mapping of colors to
       * an output color model. Here we handle some color models,
       * which were selected almost due to antique reasons.
       */
!     switch (index) {
! 	case 0:		/* DeviceGray */
! 	    set_dev_proc(pdev, map_rgb_color, gx_default_gray_map_rgb_color);
! 	    set_dev_proc(pdev, map_color_rgb, gx_default_gray_map_color_rgb);
! 	    set_dev_proc(pdev, map_cmyk_color, NULL);
! 	    set_dev_proc(pdev, get_color_mapping_procs,
! 			gx_default_DevGray_get_color_mapping_procs);
! 	    set_dev_proc(pdev, get_color_comp_index,
! 			gx_default_DevGray_get_color_comp_index);
! 	    set_dev_proc(pdev, encode_color, gx_default_gray_encode);
! 	    set_dev_proc(pdev, decode_color, gx_default_decode_color);
! 	    break;
! 	case 1:		/* DeviceRGB */
! 	    set_dev_proc(pdev, map_rgb_color, gx_default_rgb_map_rgb_color);
! 	    set_dev_proc(pdev, map_color_rgb, gx_default_rgb_map_color_rgb);
! 	    set_dev_proc(pdev, map_cmyk_color, NULL);
! 	    set_dev_proc(pdev, get_color_mapping_procs,
! 			gx_default_DevRGB_get_color_mapping_procs);
! 	    set_dev_proc(pdev, get_color_comp_index,
! 			gx_default_DevRGB_get_color_comp_index);
! 	    set_dev_proc(pdev, encode_color, gx_default_rgb_map_rgb_color);
! 	    set_dev_proc(pdev, decode_color, gx_default_rgb_map_color_rgb);
! 	    break;
! 	case 3:		/* DeviceN - treat like DeviceCMYK except for cm_name */
! 	    pdev->color_info.cm_name = "DeviceN";
! 	case 2:		/* DeviceCMYK */
! 	    set_dev_proc(pdev, map_rgb_color, NULL);
! 	    set_dev_proc(pdev, map_color_rgb, cmyk_8bit_map_color_rgb);
! 	   /* possible problems with aliassing on next statement */
! 	    set_dev_proc(pdev, map_cmyk_color, cmyk_8bit_map_cmyk_color);
! 	    set_dev_proc(pdev, get_color_mapping_procs,
! 			gx_default_DevCMYK_get_color_mapping_procs);
! 	    set_dev_proc(pdev, get_color_comp_index,
! 			gx_default_DevCMYK_get_color_comp_index);
! 	    set_dev_proc(pdev, encode_color, cmyk_8bit_map_cmyk_color);
! 	    set_dev_proc(pdev, decode_color, cmyk_8bit_map_color_rgb);
! 	    break;
! 	default:	/* can't happen - see the call from gdev_pdf_put_params. */
! 	    DO_NOTHING;
      }
  }
  #ifdef __DECC
  #pragma optimize restore
  #endif
Index: src/gdevpdfp.c
===================================================================
RCS file: /cvs/ghostscript/gs/src/gdevpdfp.c,v
retrieving revision 1.32
diff -c -5 -r1.32 gdevpdfp.c
*** src/gdevpdfp.c	18 Jun 2003 19:56:04 -0000	1.32
--- src/gdevpdfp.c	9 Oct 2003 04:23:16 -0000
***************
*** 337,347 ****
  	    /*
  	     * Set ProcessColorModel now, because gx_default_put_params checks
  	     * it.
  	     */
  	    static const char *const pcm_names[] = {
! 		"DeviceGray", "DeviceRGB", "DeviceCMYK", 0
  	    };
  	    int pcm = -1;

  	    ecode = param_put_enum(plist, "ProcessColorModel", &pcm,
  				   pcm_names, ecode);
--- 337,347 ----
  	    /*
  	     * Set ProcessColorModel now, because gx_default_put_params checks
  	     * it.
  	     */
  	    static const char *const pcm_names[] = {
! 		"DeviceGray", "DeviceRGB", "DeviceCMYK", "DeviceN", 0
  	    };
  	    int pcm = -1;

  	    ecode = param_put_enum(plist, "ProcessColorModel", &pcm,
  				   pcm_names, ecode);