Raster API

Raster API

Header cups/raster.h
Library -lcupsimage
See Also Programming: Introduction to CUPS Programming
Programming: CUPS API
Programming: PPD API
References: CUPS PPD Specification

Contents

Overview

The CUPS raster API provides a standard interface for reading and writing CUPS raster streams which are used for printing to raster printers. Because the raster format is updated from time to time, it is important to use this API to avoid incompatibilities with newer versions of CUPS.

Two kinds of CUPS filters use the CUPS raster API - raster image processor (RIP) filters such as pstoraster and cgpdftoraster (macOS) that produce CUPS raster files and printer driver filters that convert CUPS raster files into a format usable by the printer. Printer driver filters are by far the most common.

CUPS raster files (application/vnd.cups-raster) consists of a stream of raster page descriptions produced by one of the RIP filters such as pstoraster, imagetoraster, or cgpdftoraster. CUPS raster files are referred to using the cups_raster_t type and are opened using the cupsRasterOpen function. For example, to read raster data from the standard input, open file descriptor 0:

#include <cups/raster.h>

cups_raster_t *ras = cupsRasterOpen(0, CUPS_RASTER_READ);

Each page of data begins with a page dictionary structure called cups_page_header2_t. This structure contains the colorspace, bits per color, media size, media type, hardware resolution, and so forth used for the page.

Note:

Do not confuse the colorspace in the page header with the PPD ColorModel keyword. ColorModel refers to the general type of color used for a device (Gray, RGB, CMYK, DeviceN) and is often used to select a particular colorspace for the page header along with the associate color profile. The page header colorspace (cupsColorSpace) describes both the type and organization of the color data, for example KCMY (black first) instead of CMYK and RGBA (RGB + alpha) instead of RGB.

You read the page header using the cupsRasterReadHeader2 function:

#include <cups/raster.h>

cups_raster_t *ras = cupsRasterOpen(0, CUPS_RASTER_READ);
cups_page_header2_t header;

while (cupsRasterReadHeader2(ras, &header))
{
  /* setup this page */

  /* read raster data */

  /* finish this page */
}

After the page dictionary comes the page data which is a full-resolution, possibly compressed bitmap representing the page in the printer's output colorspace. You read uncompressed raster data using the cupsRasterReadPixels function. A for loop is normally used to read the page one line at a time:

#include <cups/raster.h>

cups_raster_t *ras = cupsRasterOpen(0, CUPS_RASTER_READ);
cups_page_header2_t header;
int page = 0;
int y;
char *buffer;

while (cupsRasterReadHeader2(ras, &header))
{
  /* setup this page */
  page ++;
  fprintf(stderr, "PAGE: %d %d\n", page, header.NumCopies);

  /* allocate memory for 1 line */
  buffer = malloc(header.cupsBytesPerLine);

  /* read raster data */
  for (y = 0; y < header.cupsHeight; y ++)
  {
    if (cupsRasterReadPixels(ras, buffer, header.cupsBytesPerLine) == 0)
      break;

    /* write raster data to printer on stdout */
  }

  /* finish this page */
}

When you are done reading the raster data, call the cupsRasterClose function to free the memory used to read the raster file:

cups_raster_t *ras;

cupsRasterClose(ras);

Functions by Task

Opening and Closing Raster Streams

Reading Raster Streams

Writing Raster Streams

Functions

cupsRasterClose

Close a raster stream.

void cupsRasterClose(cups_raster_t *r);

Parameters

r Stream to close

Discussion

The file descriptor associated with the raster stream must be closed separately as needed.

 CUPS 2.2/macOS 10.12 cupsRasterInitPWGHeader

Initialize a page header for PWG Raster output.

int cupsRasterInitPWGHeader(cups_page_header2_t *h, pwg_media_t *media, const char *type, int xdpi, int ydpi, const char *sides, const char *sheet_back);

Parameters

h Page header
media PWG media information
type PWG raster type string
xdpi Cross-feed direction (horizontal) resolution
ydpi Feed direction (vertical) resolution
sides IPP "sides" option value
sheet_back Transform for back side or NULL for none

Return Value

1 on success, 0 on failure

Discussion

The "media" argument specifies the media to use.

The "type" argument specifies a "pwg-raster-document-type-supported" value that controls the color space and bit depth of the raster data.

The "xres" and "yres" arguments specify the raster resolution in dots per inch.

The "sheet_back" argument specifies a "pwg-raster-document-sheet-back" value to apply for the back side of a page. Pass NULL for the front side.

 CUPS 1.2/macOS 10.5 cupsRasterInterpretPPD

Interpret PPD commands to create a page header.

int cupsRasterInterpretPPD(cups_page_header2_t *h, ppd_file_t *ppd, int num_options, cups_option_t *options, cups_interpret_cb_t func);

Parameters

h Page header to create
ppd PPD file
num_options Number of options
options Options
func Optional page header callback (NULL for none)

Return Value

0 on success, -1 on failure

Discussion

This function is used by raster image processing (RIP) filters like cgpdftoraster and imagetoraster when writing CUPS raster data for a page. It is not used by raster printer driver filters which only read CUPS raster data.

cupsRasterInterpretPPD does not mark the options in the PPD using the "num_options" and "options" arguments. Instead, mark the options with cupsMarkOptions and ppdMarkOption prior to calling it - this allows for per-page options without manipulating the options array.

The "func" argument specifies an optional callback function that is called prior to the computation of the final raster data. The function can make changes to the cups_page_header2_t data as needed to use a supported raster format and then returns 0 on success and -1 if the requested attributes cannot be supported.

cupsRasterInterpretPPD supports a subset of the PostScript language. Currently only the [, ], <<, >>, {, }, cleartomark, copy, dup, index, pop, roll, setpagedevice, and stopped operators are supported.

cupsRasterOpen

Open a raster stream using a file descriptor.

cups_raster_t *cupsRasterOpen(int fd, cups_mode_t mode);

Parameters

fd File descriptor
mode Mode - CUPS_RASTER_READ, CUPS_RASTER_WRITE, CUPS_RASTER_WRITE_COMPRESSED, or CUPS_RASTER_WRITE_PWG

Return Value

New stream

Discussion

This function associates a raster stream with the given file descriptor. For most printer driver filters, "fd" will be 0 (stdin). For most raster image processor (RIP) filters that generate raster data, "fd" will be 1 (stdout).

When writing raster data, the CUPS_RASTER_WRITE, CUPS_RASTER_WRITE_COMPRESS, or CUPS_RASTER_WRITE_PWG mode can be used - compressed and PWG output is generally 25-50% smaller but adds a 100-300% execution time overhead.

cupsRasterOpenIO

Open a raster stream using a callback function.

cups_raster_t *cupsRasterOpenIO(cups_raster_iocb_t iocb, void *ctx, cups_mode_t mode);

Parameters

iocb Read/write callback
ctx Context pointer for callback
mode Mode - CUPS_RASTER_READ, CUPS_RASTER_WRITE, CUPS_RASTER_WRITE_COMPRESSED, or CUPS_RASTER_WRITE_PWG

Return Value

New stream

Discussion

This function associates a raster stream with the given callback function and context pointer.

When writing raster data, the CUPS_RASTER_WRITE, CUPS_RASTER_WRITE_COMPRESS, or CUPS_RASTER_WRITE_PWG mode can be used - compressed and PWG output is generally 25-50% smaller but adds a 100-300% execution time overhead.

 DEPRECATED cupsRasterReadHeader

Read a raster page header and store it in a version 1 page header structure.

unsigned cupsRasterReadHeader(cups_raster_t *r, cups_page_header_t *h);

Parameters

r Raster stream
h Pointer to header data

Return Value

1 on success, 0 on failure/end-of-file

Discussion

This function is deprecated. Use cupsRasterReadHeader2 instead.

Version 1 page headers were used in CUPS 1.0 and 1.1 and contain a subset of the version 2 page header data. This function handles reading version 2 page headers and copying only the version 1 data into the provided buffer.

 CUPS 1.2/macOS 10.5 cupsRasterReadHeader2

Read a raster page header and store it in a version 2 page header structure.

unsigned cupsRasterReadHeader2(cups_raster_t *r, cups_page_header2_t *h);

Parameters

r Raster stream
h Pointer to header data

Return Value

1 on success, 0 on failure/end-of-file

cupsRasterReadPixels

Read raster pixels.

unsigned cupsRasterReadPixels(cups_raster_t *r, unsigned char *p, unsigned len);

Parameters

r Raster stream
p Pointer to pixel buffer
len Number of bytes to read

Return Value

Number of bytes read

Discussion

For best performance, filters should read one or more whole lines. The "cupsBytesPerLine" value from the page header can be used to allocate the line buffer and as the number of bytes to read.

 DEPRECATED cupsRasterWriteHeader

Write a raster page header from a version 1 page header structure.

unsigned cupsRasterWriteHeader(cups_raster_t *r, cups_page_header_t *h);

Parameters

r Raster stream
h Raster page header

Return Value

1 on success, 0 on failure

Discussion

This function is deprecated. Use cupsRasterWriteHeader2 instead.

 CUPS 1.2/macOS 10.5 cupsRasterWriteHeader2

Write a raster page header from a version 2 page header structure.

unsigned cupsRasterWriteHeader2(cups_raster_t *r, cups_page_header2_t *h);

Parameters

r Raster stream
h Raster page header

Return Value

1 on success, 0 on failure

Discussion

The page header can be initialized using cupsRasterInitPWGHeader.

cupsRasterWritePixels

Write raster pixels.

unsigned cupsRasterWritePixels(cups_raster_t *r, unsigned char *p, unsigned len);

Parameters

r Raster stream
p Bytes to write
len Number of bytes to write

Return Value

Number of bytes written

Discussion

For best performance, filters should write one or more whole lines. The "cupsBytesPerLine" value from the page header can be used to allocate the line buffer and as the number of bytes to write.

Data Types

cups_adv_t

AdvanceMedia attribute values

typedef enum cups_adv_e cups_adv_t;

cups_bool_t

Boolean type

typedef enum cups_bool_e cups_bool_t;

cups_cspace_t

cupsColorSpace attribute values

typedef enum cups_cspace_e cups_cspace_t;

cups_cut_t

CutMedia attribute values

typedef enum cups_cut_e cups_cut_t;

cups_edge_t

LeadingEdge attribute values

typedef enum cups_edge_e cups_edge_t;

cups_interpret_cb_t

cupsRasterInterpretPPD callback function

typedef int (*cups_interpret_cb_t)(cups_page_header2_t *header, int preferred_bits);

cups_jog_t

Jog attribute values

typedef enum cups_jog_e cups_jog_t;

cups_mode_t

cupsRasterOpen modes

typedef enum cups_mode_e cups_mode_t;

cups_order_t

cupsColorOrder attribute values

typedef enum cups_order_e cups_order_t;

cups_orient_t

Orientation attribute values

typedef enum cups_orient_e cups_orient_t;

 CUPS 1.2/macOS 10.5 cups_page_header2_t

Version 2 page header

typedef struct cups_page_header2_s cups_page_header2_t;

 DEPRECATED cups_page_header_t

Version 1 page header

typedef struct cups_page_header_s cups_page_header_t;

cups_raster_iocb_t

cupsRasterOpenIO callback function

typedef ssize_t (*cups_raster_iocb_t)(void *ctx, unsigned char *buffer, size_t length);

cups_raster_t

Raster stream data

typedef struct _cups_raster_s cups_raster_t;

Structures

 CUPS 1.2/macOS 10.5 cups_page_header2_s

Version 2 page header

struct cups_page_header2_s {
    unsigned AdvanceDistance;
    cups_adv_t AdvanceMedia;
    cups_bool_t Collate;
    cups_cut_t CutMedia;
    cups_bool_t Duplex;
    unsigned HWResolution[2];
    unsigned ImagingBoundingBox[4];
    cups_bool_t InsertSheet;
    cups_jog_t Jog;
    cups_edge_t LeadingEdge;
    cups_bool_t ManualFeed;
    unsigned Margins[2];
    char MediaClass[64];
    char MediaColor[64];
    unsigned MediaPosition;
    char MediaType[64];
    unsigned MediaWeight;
    cups_bool_t MirrorPrint;
    cups_bool_t NegativePrint;
    unsigned NumCopies;
    cups_orient_t Orientation;
    cups_bool_t OutputFaceUp;
    char OutputType[64];
    unsigned PageSize[2];
    cups_bool_t Separations;
    cups_bool_t TraySwitch;
    cups_bool_t Tumble;
    unsigned cupsBitsPerColor;
    unsigned cupsBitsPerPixel;
    float cupsBorderlessScalingFactor;
    unsigned cupsBytesPerLine;
    cups_order_t cupsColorOrder;
    cups_cspace_t cupsColorSpace;
    unsigned cupsCompression;
    unsigned cupsHeight;
    float cupsImagingBBox[4];
    unsigned cupsInteger[16];
    char cupsMarkerType[64];
    unsigned cupsMediaType;
    unsigned cupsNumColors;
    char cupsPageSizeName[64];
    float cupsPageSize[2];
    float cupsReal[16];
    char cupsRenderingIntent[64];
    unsigned cupsRowCount;
    unsigned cupsRowFeed;
    unsigned cupsRowStep;
    char cupsString[16][64];
    unsigned cupsWidth;
};

Members

AdvanceDistance AdvanceDistance value in points
AdvanceMedia AdvanceMedia value (cups_adv_t)
Collate Collated copies value
CutMedia CutMedia value (cups_cut_t)
Duplex Duplexed (double-sided) value
HWResolution[2] Resolution in dots-per-inch
ImagingBoundingBox[4] Pixel region that is painted (points, left, bottom, right, top)
InsertSheet InsertSheet value
Jog Jog value (cups_jog_t)
LeadingEdge LeadingEdge value (cups_edge_t)
ManualFeed ManualFeed value
Margins[2] Lower-lefthand margins in points
MediaClass[64] MediaClass string
MediaColor[64] MediaColor string
MediaPosition MediaPosition value
MediaType[64] MediaType string
MediaWeight MediaWeight value in grams/m^2
MirrorPrint MirrorPrint value
NegativePrint NegativePrint value
NumCopies Number of copies to produce
Orientation Orientation value (cups_orient_t)
OutputFaceUp OutputFaceUp value
OutputType[64] OutputType string
PageSize[2] Width and length of page in points
Separations Separations value
TraySwitch TraySwitch value
Tumble Tumble value
cupsBitsPerColor Number of bits for each color
cupsBitsPerPixel Number of bits for each pixel
cupsBorderlessScalingFactor  CUPS 1.2/macOS 10.5  Scaling that was applied to page data
cupsBytesPerLine Number of bytes per line
cupsColorOrder Order of colors
cupsColorSpace True colorspace
cupsCompression Device compression to use
cupsHeight Height of page image in pixels
cupsImagingBBox[4]  CUPS 1.2/macOS 10.5  Floating point ImagingBoundingBox (scaling factor not applied, left, bottom, right, top)
cupsInteger[16]  CUPS 1.2/macOS 10.5  User-defined integer values
cupsMarkerType[64]  CUPS 1.2/macOS 10.5  Ink/toner type
cupsMediaType Media type code
cupsNumColors  CUPS 1.2/macOS 10.5  Number of color compoents
cupsPageSizeName[64]  CUPS 1.2/macOS 10.5  PageSize name
cupsPageSize[2]  CUPS 1.2/macOS 10.5  Floating point PageSize (scaling * factor not applied)
cupsReal[16]  CUPS 1.2/macOS 10.5  User-defined floating-point values
cupsRenderingIntent[64]  CUPS 1.2/macOS 10.5  Color rendering intent
cupsRowCount Rows per band
cupsRowFeed Feed between bands
cupsRowStep Spacing between lines
cupsString[16][64]  CUPS 1.2/macOS 10.5  User-defined string values
cupsWidth Width of page image in pixels

 DEPRECATED cups_page_header_s

Version 1 page header

struct cups_page_header_s {
    unsigned AdvanceDistance;
    cups_adv_t AdvanceMedia;
    cups_bool_t Collate;
    cups_cut_t CutMedia;
    cups_bool_t Duplex;
    unsigned HWResolution[2];
    unsigned ImagingBoundingBox[4];
    cups_bool_t InsertSheet;
    cups_jog_t Jog;
    cups_edge_t LeadingEdge;
    cups_bool_t ManualFeed;
    unsigned Margins[2];
    char MediaClass[64];
    char MediaColor[64];
    unsigned MediaPosition;
    char MediaType[64];
    unsigned MediaWeight;
    cups_bool_t MirrorPrint;
    cups_bool_t NegativePrint;
    unsigned NumCopies;
    cups_orient_t Orientation;
    cups_bool_t OutputFaceUp;
    char OutputType[64];
    unsigned PageSize[2];
    cups_bool_t Separations;
    cups_bool_t TraySwitch;
    cups_bool_t Tumble;
    unsigned cupsBitsPerColor;
    unsigned cupsBitsPerPixel;
    unsigned cupsBytesPerLine;
    cups_order_t cupsColorOrder;
    cups_cspace_t cupsColorSpace;
    unsigned cupsCompression;
    unsigned cupsHeight;
    unsigned cupsMediaType;
    unsigned cupsRowCount;
    unsigned cupsRowFeed;
    unsigned cupsRowStep;
    unsigned cupsWidth;
};

Members

AdvanceDistance AdvanceDistance value in points
AdvanceMedia AdvanceMedia value (cups_adv_t)
Collate Collated copies value
CutMedia CutMedia value (cups_cut_t)
Duplex Duplexed (double-sided) value
HWResolution[2] Resolution in dots-per-inch
ImagingBoundingBox[4] Pixel region that is painted (points, left, bottom, right, top)
InsertSheet InsertSheet value
Jog Jog value (cups_jog_t)
LeadingEdge LeadingEdge value (cups_edge_t)
ManualFeed ManualFeed value
Margins[2] Lower-lefthand margins in points
MediaClass[64] MediaClass string
MediaColor[64] MediaColor string
MediaPosition MediaPosition value
MediaType[64] MediaType string
MediaWeight MediaWeight value in grams/m^2
MirrorPrint MirrorPrint value
NegativePrint NegativePrint value
NumCopies Number of copies to produce
Orientation Orientation value (cups_orient_t)
OutputFaceUp OutputFaceUp value
OutputType[64] OutputType string
PageSize[2] Width and length of page in points
Separations Separations value
TraySwitch TraySwitch value
Tumble Tumble value
cupsBitsPerColor Number of bits for each color
cupsBitsPerPixel Number of bits for each pixel
cupsBytesPerLine Number of bytes per line
cupsColorOrder Order of colors
cupsColorSpace True colorspace
cupsCompression Device compression to use
cupsHeight Height of page image in pixels
cupsMediaType Media type code
cupsRowCount Rows per band
cupsRowFeed Feed between bands
cupsRowStep Spacing between lines
cupsWidth Width of page image in pixels

Constants

cups_adv_e

AdvanceMedia attribute values

Constants

CUPS_ADVANCE_FILE Advance the roll after this file
CUPS_ADVANCE_JOB Advance the roll after this job
CUPS_ADVANCE_NONE Never advance the roll
CUPS_ADVANCE_PAGE Advance the roll after this page
CUPS_ADVANCE_SET Advance the roll after this set

cups_bool_e

Boolean type

Constants

CUPS_FALSE Logical false
CUPS_TRUE Logical true

cups_cspace_e

cupsColorSpace attribute values

Constants

CUPS_CSPACE_ADOBERGB  CUPS 1.4.5  Red, green, blue (Adobe RGB)
CUPS_CSPACE_CIELab  CUPS 1.1.19/macOS 10.3  CIE Lab
CUPS_CSPACE_CIEXYZ  CUPS 1.1.19/macOS 10.3  CIE XYZ
CUPS_CSPACE_CMY Cyan, magenta, yellow (DeviceCMY)
CUPS_CSPACE_CMYK Cyan, magenta, yellow, black (DeviceCMYK)
CUPS_CSPACE_DEVICE1  CUPS 1.4.5  DeviceN, 1 color
CUPS_CSPACE_DEVICE2  CUPS 1.4.5  DeviceN, 2 colors
CUPS_CSPACE_DEVICE3  CUPS 1.4.5  DeviceN, 3 colors
CUPS_CSPACE_DEVICE4  CUPS 1.4.5  DeviceN, 4 colors
CUPS_CSPACE_DEVICE5  CUPS 1.4.5  DeviceN, 5 colors
CUPS_CSPACE_DEVICE6  CUPS 1.4.5  DeviceN, 6 colors
CUPS_CSPACE_DEVICE7  CUPS 1.4.5  DeviceN, 7 colors
CUPS_CSPACE_DEVICE8  CUPS 1.4.5  DeviceN, 8 colors
CUPS_CSPACE_DEVICE9  CUPS 1.4.5  DeviceN, 9 colors
CUPS_CSPACE_DEVICEA  CUPS 1.4.5  DeviceN, 10 colors
CUPS_CSPACE_DEVICEB  CUPS 1.4.5  DeviceN, 11 colors
CUPS_CSPACE_DEVICEC  CUPS 1.4.5  DeviceN, 12 colors
CUPS_CSPACE_DEVICED  CUPS 1.4.5  DeviceN, 13 colors
CUPS_CSPACE_DEVICEE  CUPS 1.4.5  DeviceN, 14 colors
CUPS_CSPACE_DEVICEF  CUPS 1.4.5  DeviceN, 15 colors
CUPS_CSPACE_GMCK  DEPRECATED  Gold, magenta, yellow, black
CUPS_CSPACE_GMCS  DEPRECATED  Gold, magenta, yellow, silver
CUPS_CSPACE_GOLD  DEPRECATED  Gold foil
CUPS_CSPACE_ICC1  CUPS 1.1.19/macOS 10.3  ICC-based, 1 color
CUPS_CSPACE_ICC2  CUPS 1.1.19/macOS 10.3  ICC-based, 2 colors
CUPS_CSPACE_ICC3  CUPS 1.1.19/macOS 10.3  ICC-based, 3 colors
CUPS_CSPACE_ICC4  CUPS 1.1.19/macOS 10.3  ICC-based, 4 colors
CUPS_CSPACE_ICC5  CUPS 1.1.19/macOS 10.3  ICC-based, 5 colors
CUPS_CSPACE_ICC6  CUPS 1.1.19/macOS 10.3  ICC-based, 6 colors
CUPS_CSPACE_ICC7  CUPS 1.1.19/macOS 10.3  ICC-based, 7 colors
CUPS_CSPACE_ICC8  CUPS 1.1.19/macOS 10.3  ICC-based, 8 colors
CUPS_CSPACE_ICC9  CUPS 1.1.19/macOS 10.3  ICC-based, 9 colors
CUPS_CSPACE_ICCA  CUPS 1.1.19/macOS 10.3  ICC-based, 10 colors
CUPS_CSPACE_ICCB  CUPS 1.1.19/macOS 10.3  ICC-based, 11 colors
CUPS_CSPACE_ICCC  CUPS 1.1.19/macOS 10.3  ICC-based, 12 colors
CUPS_CSPACE_ICCD  CUPS 1.1.19/macOS 10.3  ICC-based, 13 colors
CUPS_CSPACE_ICCE  CUPS 1.1.19/macOS 10.3  ICC-based, 14 colors
CUPS_CSPACE_ICCF  CUPS 1.1.19/macOS 10.3  ICC-based, 15 colors
CUPS_CSPACE_K Black (DeviceK)
CUPS_CSPACE_KCMY  DEPRECATED  Black, cyan, magenta, yellow
CUPS_CSPACE_KCMYcm  DEPRECATED  Black, cyan, magenta, yellow, light-cyan, light-magenta
CUPS_CSPACE_RGB Red, green, blue (DeviceRGB, sRGB by default)
CUPS_CSPACE_RGBA Red, green, blue, alpha (DeviceRGB, sRGB by default)
CUPS_CSPACE_RGBW  CUPS 1.2/macOS 10.5  Red, green, blue, white (DeviceRGB, sRGB by default)
CUPS_CSPACE_SILVER  DEPRECATED  Silver foil
CUPS_CSPACE_SRGB  CUPS 1.4.5  Red, green, blue (sRGB)
CUPS_CSPACE_SW  CUPS 1.4.5  Luminance (gamma 2.2)
CUPS_CSPACE_W Luminance (DeviceGray, gamma 2.2 by default)
CUPS_CSPACE_WHITE  DEPRECATED  White ink (as black)
CUPS_CSPACE_YMC  DEPRECATED  Yellow, magenta, cyan
CUPS_CSPACE_YMCK  DEPRECATED  Yellow, magenta, cyan, black

cups_cut_e

CutMedia attribute values

Constants

CUPS_CUT_FILE Cut the roll after this file
CUPS_CUT_JOB Cut the roll after this job
CUPS_CUT_NONE Never cut the roll
CUPS_CUT_PAGE Cut the roll after this page
CUPS_CUT_SET Cut the roll after this set

cups_edge_e

LeadingEdge attribute values

Constants

CUPS_EDGE_BOTTOM Leading edge is the bottom of the page
CUPS_EDGE_LEFT Leading edge is the left of the page
CUPS_EDGE_RIGHT Leading edge is the right of the page
CUPS_EDGE_TOP Leading edge is the top of the page

cups_jog_e

Jog attribute values

Constants

CUPS_JOG_FILE Move pages after this file
CUPS_JOG_JOB Move pages after this job
CUPS_JOG_NONE Never move pages
CUPS_JOG_SET Move pages after this set

cups_mode_e

cupsRasterOpen modes

Constants

CUPS_RASTER_READ Open stream for reading
CUPS_RASTER_WRITE Open stream for writing
CUPS_RASTER_WRITE_COMPRESSED  CUPS 1.3/macOS 10.5  Open stream for compressed writing
CUPS_RASTER_WRITE_PWG  CUPS 1.5/macOS 10.7  Open stream for compressed writing in PWG Raster mode

cups_order_e

cupsColorOrder attribute values

Constants

CUPS_ORDER_BANDED CCC MMM YYY KKK ...
CUPS_ORDER_CHUNKED CMYK CMYK CMYK ...
CUPS_ORDER_PLANAR CCC ... MMM ... YYY ... KKK ...

cups_orient_e

Orientation attribute values

Constants

CUPS_ORIENT_0 Don't rotate the page
CUPS_ORIENT_180 Turn the page upside down
CUPS_ORIENT_270 Rotate the page clockwise
CUPS_ORIENT_90 Rotate the page counter-clockwise