Raster API

Header	cups/raster.h
Library	-lcups
See Also	Programming: CUPS Programming Manual Programming: PPD API References: CUPS PPD Specification

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

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 1.3/macOS 10.5 cupsRasterErrorString

Return the last error from a raster function.

const char *cupsRasterErrorString(void);

Return Value

Last error or NULL

Discussion

If there are no recent errors, NULL is returned.

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.

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_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

Raster API

Contents

Parameters

Discussion

CUPS 1.3/macOS 10.5 cupsRasterErrorString

Return Value

Discussion

CUPS 2.2/macOS 10.12 cupsRasterInitPWGHeader

Parameters

Return Value

Discussion

Parameters

Return Value

Discussion

Parameters

Return Value

Discussion

DEPRECATED cupsRasterReadHeader

Parameters

Return Value

Discussion

CUPS 1.2/macOS 10.5 cupsRasterReadHeader2

Parameters

Return Value

Parameters

Return Value

Discussion

DEPRECATED cupsRasterWriteHeader

Parameters

Return Value

Discussion

CUPS 1.2/macOS 10.5 cupsRasterWriteHeader2

Parameters

Return Value

Discussion

Parameters

Return Value

Discussion

CUPS 1.2/macOS 10.5 cups_page_header2_s

Members

DEPRECATED cups_page_header_s

Members

Constants

Constants

Constants

Constants

Constants

Constants

Constants

Constants

Constants