This is gimpprint.info, produced by makeinfo version 4.0 from gimpprint.texi. INFO-DIR-SECTION Libraries START-INFO-DIR-ENTRY * GIMP-Print: (gimpprint). print plugin for the GIMP, and printing library END-INFO-DIR-ENTRY This file documents the gimpprint library and associated programs used for high quality printing. Copyright (C) 2001 Michael Sweet (<mike@easysw.com>) and Robert Krawitz (<rlk@alum.mit.edu>) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be stated in a translation approved by the Foundation. File: gimpprint.info, Node: Top, Prev: (dir), Up: (dir) The print plugin for the GIMP and printing library ************************************************** This file documents the libgimpprint library and associated programs used for high quality printing. This edition documents version 4.2.6. *Note Problems::, for information on how to report problems with GIMP-Print. * Menu: * Instructions:: How to read this manual. * Copying:: Your rights. * Overview:: Preliminary information. * Using libgimpprint:: Examples of how to use libgimpprint. * Integrating libgimpprint:: Using libgimpprint in your own packages. * Functions:: libgimpprint function reference. * Programs:: Using GIMP-Print programs. * Problems:: Reporting bugs. * Appendices:: Additional information. * Data Type and Variable Index:: Index of data types and variables. * Function and Macro Index:: Index of functions and macros. * Concept Index:: Index of concepts. File: gimpprint.info, Node: Instructions, Next: Copying, Prev: Top, Up: Top Preface ******* This manual documents the use of the GIMP-Print package, focusing mainly on the libgimpprint library that is the core of GIMP-Print. Parts of the manual which describe the use of libgimpprint are aimed primarily at programmers, and do assume that the reader is familiar with C programming, and using standard programming tools on GNU or UNIX systems. Other parts of the manual document the use of the programs that make up the GIMP-Print package, and assume no knowledge other than the basics of using a shell and editor. The best way to learn how to use libgimpprint in your own programs is to read the manual from start to finish, using the examples given in the text to learn how it works. The bulk of the manual can be used as a reference once one understands the basics. The manual is split into several parts for the programmer. It starts with a simple usage example of how to link a program with libgimpprint, then how to integrate this into package build scripts, using `make', `autoconf' and `automake'. This is followed by a detailed function reference, including descriptions of all the data types used. For the end-user, there is a section on all of the programs that come with GIMP-Print, including the GIMP `print' plugin, and the CUPS and Ghostscript drivers. The appendices at the end of the manual detail the dither and weave algorithms used in libgimpprint, the ESC/P2 printer control language used in Epson printers and how to add support for a new printer to libgimpprint. We hope you enjoy using GIMP-Print! --The GIMP-Print project File: gimpprint.info, Node: Copying, Next: Overview, Prev: Instructions, Up: Top GNU GENERAL PUBLIC LICENSE ************************** Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 675 Mass Ave, Cambridge, MA 02139, USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble ======== The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. 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If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 1. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. 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In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 4. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a. Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b. 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If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 10. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. ONE LINE TO GIVE THE PROGRAM'S NAME AND AN IDEA OF WHAT IT DOES. Copyright (C) 19YY NAME OF AUTHOR This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) 19YY NAME OF AUTHOR Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. SIGNATURE OF TY COON, 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License. Copying summary *************** GIMP-Print is "free"; this means that everyone is free to use it and free to redistribute it on a free basis. GIMP-Print is not in the public domain; it is copyrighted and there are restrictions on its distribution, but these restrictions are designed to permit everything that a good cooperating citizen would want to do. What is not allowed is to try to prevent others from further sharing any version of GIMP-Print that they might get from you. Specifically, we want to make sure that you have the right to give away copies of GIMP-Print, that you receive source code or else can get it if you want it, that you can change GIMP-Print or use pieces of it in new free programs, and that you know you can do these things. To make sure that everyone has such rights, we have to forbid you to deprive anyone else of these rights. For example, if you distribute copies of GIMP-Print, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must tell them their rights. Also, for our own protection, we must make certain that everyone finds out that there is no warranty for GIMP-Print. If GIMP-Print is modified by someone else and passed on, we want their recipients to know that what they have is not what we distributed, so that any problems introduced by others will no reflect on our reputation. File: gimpprint.info, Node: Overview, Next: Using libgimpprint, Prev: Copying, Up: Top Overview ******** The GIMP-Print package is a collection of programs and a library for high quality printing on modern inkjets, including `photographic quality' models which offer very high resolutions and several inks. META: Short history of the project GIMP-Print is the print facility of the "GNU Image Manipulation Program" (GIMP). It is in addition a suite of drivers that may be used with common UNIX spooling systems using GhostScript or CUPS. These drivers provide printing quality for UNIX/Linux on a par with proprietary vendor-supplied drivers in many cases, and can be used for many of the most demanding printing tasks. The core of GIMP-Print is a shared library (libgimpprint) which may be used by any program that wishes to produce high-qulaity printed output. File: gimpprint.info, Node: Using libgimpprint, Next: Integrating libgimpprint, Prev: Overview, Up: Top Using libgimpprint ****************** This chapter describes how to write programs that use libgimpprint. Code prerequisites ================== To use libgimpprint with a program, several steps must be taken: 1. Include the master libgimpprint header `<gimp-print/gimp-print.h>.' 2. Call `stp_init()'. 3. Link with libgimpprint. The following is a short example program. It does not do anything useful, but it does everything required to link with libgimpprint and call other functions from libgimpprint. #include <gimp-print/gimp-print.h> int main (int argc, char *argv[]) { stp_init (); return (0); } Linking with libgimpprint ========================= To link a program with libgimpprint, then `-lgimpprint' needs to be passed to the compiler when linking. For example, to compile and link `prog.c' the following commands would be used: gcc -c prog.c gcc -o prog -lgimpprint prog.o The compiler and linker flags needed may vary depending on the options GIMP-Print was configured with when it was built. The `gimpprint-config' script will give the correct parameters for the local installation (*note gimpprint-config::). File: gimpprint.info, Node: Integrating libgimpprint, Next: Functions, Prev: Using libgimpprint, Up: Top Integrating libgimpprint ************************ This chapter describes how to integrate the compiling and linking of programs using libgimpprint with build scripts. Commonly used systems include `make', but more commonly `Makefile' files are generated by using tools such as `autoconf' and `automake'. * Menu: * gimpprint-config:: Getting the correct compiler and linker flags * make:: Normal makefiles * autoconf:: Macro to automatically check for libgimpprint * automake:: Automatically defined variables to use File: gimpprint.info, Node: gimpprint-config, Next: make, Up: Integrating libgimpprint `gimpprint-config' ================== Depending on the setup of the computer system GIMP-Print was installed on, as well as the options passed to `configure' when configuring the package when it was built, the `CFLAGS' and `LIBS' parameters needed to compile and link programs with libgimpprint may vary. To make it simple to determine what these are on any given system, the script `gimpprint-config' was created. It's job is to output the correct parameters for the setup on your system. The following options are available: roger@whinlatter:~/gimpprint/devel$ gimpprint-config --help Usage: gimpprint-config [OPTIONS] [LIBRARIES] Options: [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--libs] [--cflags] Libraries: gimpprint The `--prefix' and `--exec-prefix' options are only needed if the installed locations of parts of GIMP-Print are different from the configured locations. These should never be needed if GIMP-Print was properly configured and installed. The installed version of GIMP-Print can be obtained with the `--version' option: roger@whinlatter:~/gimpprint/devel$ gimpprint-config --version 4.2.6 The correct `CFLAGS' to use can be obtained with the `--cflags' option: roger@whinlatter:~/gimpprint/devel$ gimpprint-config --cflags In this case, there are no special `CFLAGS' required to compile programs. The correct `LIBS' to use can the obtained with the `--libs' option: roger@whinlatter:~/gimpprint/devel$ gimpprint-config --libs -L/usr/lib -lgimpprint -lm The command can be used from the shell by enclosing it in backquotes ``': gcc `gimpprint-config --cflags` -c prog.c gcc `gimpprint-config --libs` -o prog prog.o However, this is not the way it it typically used. Normally it is used in a `Makefile' (*note make::) or by an `m4' macro in a `configure' script (*note autoconf::). File: gimpprint.info, Node: make, Next: autoconf, Prev: gimpprint-config, Up: Integrating libgimpprint `make' ====== If you use `make' with your own `Makefile' files, then you are on your own. This manual offers no assistance with doing this. Only the following suggestion is offered: GIMPPRINT_VERSION = $(shell gimpprint-config --version) GIMPPRINT_CFLAGS = $(shell gimpprint-config --cflags) GIMPPRINT_LIBS = $(shell gimpprint-config --libs) How you choose to use these variables is entirely up to you. *note GNU make: (make)Top, for more information. File: gimpprint.info, Node: autoconf, Next: automake, Prev: make, Up: Integrating libgimpprint `autoconf' ========== The `autoconf' program produces a Bourne shell script called `configure' from a template file called `configure.in'. `configure.in' contains both Bourne shell script, and `m4' macros. `autoconf' expands the `m4' macros into `real' shell script. The resulting `configure' script performs various checks for installed programs, compiler characteristics and other system information such as available headers and libraries. *note GNU autoconf: (autoconf)Top, for more information. GIMP-Print provides an `m4' macro, `AM_PATH_GIMPPRINT', suitable for use in a `configure.in'. It defines the environment variables `GIMPPRINT_CFLAGS', `GIMPPRINT_LIBS' and `GIMPPRINT_CONFIG'. You can optionally specify a minimum version of the library to use, and shell script to run if the test suceeds or fails. - Macro: AM_PATH_GIMPPRINT ([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]]) Check for an installed version of GIMP-Print greater than or equal to MINIMUM-VERSION. ACTION-IF-FOUND is a list of shell commands to run if the check for the library succeeds; ACTION-IF-NOT-FOUND is a list of shell commands to run if the check fails. The macro sets the following environment variables: `GIMPPRINT_CFLAGS', `GIMPPRINT_LIBS' and `GIMPPRINT_CONFIG'. It also will substitute them into any `Makefile.in' you specify in `AC_OUTPUT' because it calls `AC_SUBST' for each of them. However, you will probably be using `automake' to generate your `Makefile.in' files (*note automake::). File: gimpprint.info, Node: automake, Prev: autoconf, Up: Integrating libgimpprint `automake' ========== The `automake' program can be used to generate `Makefile.in' files suitable for use with a `configure' script generated by `autoconf'. As `automake' _requires_ `autoconf', this section will assume the use of a `configure' script which uses the `AM_PATH_GIMPPRINT' macro (there is little point in _not_ using it!). It is highly recommeded that you use GNU `autoconf' and `automake'. They will allow you to make your software build on most platforms with most compilers. `automake' makes writing complex `Makefile' files very easy, by expressing how to build your packages in terms of what files are required to build a project and the installation locations of the files. It imposes a few limitations over using plain `Makefile' files, such as in the use of conditionals, but these problems are vastly outweighed by the benefits it brings. It also creates many extra targets in the generated `Makefile.in' files such as `dist', `distcheck', `clean', `distclean', `maintainer-clean' and `tags', and there are many more more available. *note GNU automake: (automake)Top, for more information. Because `AM_PATH_GIMPPRINT' calls `AC_SUBST' to substitute `GIMPPRINT_CFLAGS', `GIMPPRINT_LIBS' and `GIMPPRINT_CONFIG', `automake' will automatically set these variables in the `Makefile.in' files it generates, requiring no additional effort on your part! As in previous examples, we will make a program `prog' from a file `prog.c'. This is how one might build write a `Makefile.am' to do this: AUTOMAKE_OPTIONS = 1.4 gnu MAINT_CHARSET = latin1 @SET_MAKE@ CFLAGS = @CFLAGS@ INCLUDES = @INCLUDES@ $(GIMPPRINT_CFLAGS) bin_PROGRAMS = prog prog_SOURCES = prog.c prog_LDADD = $(GIMPPRINT_LIBS) MAINTAINERCLEANFILES = Makefile.in That's all there is to it! Please note that this example also requires the macro `AC_PROG_MAKE_SET' to be used in `configure.in' and the use of `AC_SUBST' to substitute `CFLAGS' and `INCLUDES' where `@CFLAGS@' and `@INCLUDES@' are found in the file, respectively. File: gimpprint.info, Node: Functions, Next: Programs, Prev: Integrating libgimpprint, Up: Top Functions ********* This section of the manual is a complete reference to all of the functions comprising libgimpprint, with examples. All of the libgimpprint functions can be declared by including the master libgimpprint header, `<gimp-print/gimp-print.h>'. This should be done in every source file that uses gimpprint functions by putting #include <gimp-print/gimp-print.h> at the top of each file. * Menu: * Main functions:: Essential functions every program must call. * stp_vars_t functions:: Using stp_vars_t. * Dither functions:: Dither algorithms. * Options functions:: Options. * Paper functions:: Paper size and orientation. * Printer functions:: Printer selection. * Settings functions:: Getting and changing settings. * Version functions:: Getting libgimpprint version information. File: gimpprint.info, Node: Main functions, Next: stp_vars_t functions, Up: Functions Main functions ============== These functions are essential to the correct functioning of libgimpprint. All or most other functions in the library depend absolutely upon them. In the case of `stp_init', this function _must_ be called before any of the other functions in the library. - Function: int stp_init (void) This function initialises the libgimpprint library. It must be called before any of the other libgimpprint functions are called. It is responsible for setting up message catalogues (for internationalisation). This function may be called more than once, at any stage during the execution of a program. It returns zero on success, nonzero on failure. `stp_init' might be used as follows: int main (int argc, char **argv) { stp_init(); ... } - Function: void * stp_malloc (size_t SIZE) Where SIZE is the amount of memory to allocate (in bytes). This function allocates memory. It will always return a pointer to the allocated memory. It will not return on failure. It returns a pointer to the allocated memory. File: gimpprint.info, Node: stp_vars_t functions, Next: Dither functions, Prev: Main functions, Up: Functions `stp_vars_t' functions ====================== - Data type: void * stp_vars_t This is an opaque data type, whose structure is not visible to the user. This object contains all of the information about settings for a given printer, such as color (contrast, brightness), the type of printer, the dithering algorithm in use, and so forth. Please see the `stp_set_*' and `stp_get_*' functions below for the accessors and mutators for this data type. - Function: stp_vars_t stp_allocate_vars (void) Allocate a new `stp_vars_t' with default settings for all members. - Function: void stp_copy_vars (stp_vars_t VD, const stp_vars_t VS) Copy the settings from VS to VD. - Function: stp_vars_t stp_allocate_copy (const stp_vars_t VS) Allocate a new `stp_vars_t', copying settings from VS. - Function: void stp_free_vars (stp_vars_t VV) Free all resources associated with VV. VV must not be used in any way following this call. - Function: const char * stp_get_output_to (const stp_vars_t VV) - Function: void stp_set_output_to (stp_vars_t VV, const char *VAL) - Function: void stp_set_output_to_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the name of the command that this job will be printed to. This is used by front ends; the driver library always prints to a stream provided by the front end and never uses this directly. - Function: const char * stp_get_driver (const stp_vars_t VV) - Function: void stp_set_driver (stp_vars_t VV, const char *VAL) - Function: void stp_set_driver_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the name of the driver (the type of printer). - Function: const char * stp_get_ppd_file (const stp_vars_t VV) - Function: void stp_set_ppd_file (stp_vars_t VV, const char *VAL) - Function: void stp_set_ppd_file_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the name of the PPD file used by this print job. Normally, only PostScript printers use PPD files. - Function: const char * stp_get_resolution (const stp_vars_t VV) - Function: void stp_set_resolution (stp_vars_t VV, const char *VAL) - Function: void stp_set_resolution_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the resolution to be used in this print job. Different drivers support different resolutions, and many drivers support multiple quality settings for a given DPI resolution. - Function: const char * stp_get_media_size (const stp_vars_t VV) - Function: void stp_set_media_size (stp_vars_t VV, const char *VAL) - Function: void stp_set_media_size_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the name of the media size (e. g. A3, letter, legal) to be used in this print job. - Function: const char * stp_get_media_type (const stp_vars_t VV) - Function: void stp_set_media_type (stp_vars_t VV, const char *VAL) - Function: void stp_set_media_type_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the name of the media type (e. g. plain paper, photo quality inkjet paper) to be used in this print job. - Function: const char * stp_get_media_source (const stp_vars_t VV) - Function: void stp_set_media_source (stp_vars_t VV, const char *VAL) - Function: void stp_set_media_source_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the name of the media source (e. g. manual feed, tray A) to be used in this print job. - Function: const char * stp_get_ink_type (const stp_vars_t VV) - Function: void stp_set_ink_type (stp_vars_t VV, const char *VAL) - Function: void stp_set_ink_type_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the name of the ink type (e. g. four color standard, six color photo) to be used in this print job. - Function: const char * stp_get_dither_algorithm (const stp_vars_t VV) - Function: void stp_set_dither_algorithm (stp_vars_t VV, const char *VAL) - Function: void stp_set_dither_algorithm_n (stp_vars_t VV, const char *VAL, int BYTES) Get or set the dither algorithm to be used in this print job. - Function: int stp_get_output_type (const stp_vars_t VV) - Function: void stp_set_output_type (stp_vars_t VV, int VAL) Get or set the output type (color, grayscale, black and white) for this print job. - Function: int stp_get_orientation (const stp_vars_t VV) - Function: void stp_set_orientation (stp_vars_t VV, int VAL) Get or set the paper orientation for this print job. - Function: int stp_get_left (const stp_vars_t VV) - Function: void stp_set_left (stp_vars_t VV, int VAL) Get or set the left margin (in 1/72 inch units, or "points") for this print job. - Function: int stp_get_top (const stp_vars_t VV) - Function: void stp_set_top (stp_vars_t VV, int VAL) Get or set the top margin (in 1/72 inch units, or "points") for this print job. - Function: int stp_get_image_type (const stp_vars_t VV) - Function: void stp_set_image_type (stp_vars_t VV, int VAL) Get or set the image type (line art, continuous tone, solid colors) for this print job. - Function: int stp_get_unit (const stp_vars_t VV) - Function: void stp_set_unit (stp_vars_t VV, int VAL) Get or set the base unit (inches or centimeters) for this print job. This is provided for front ends; the package itself uses points as its unit of measurement. - Function: int stp_get_page_width (const stp_vars_t VV) - Function: void stp_set_page_width (stp_vars_t VV, int VAL) Get or set the width of the printed region of the page. - Function: int stp_get_page_height (const stp_vars_t VV) - Function: void stp_set_page_height (stp_vars_t VV, int VAL) Get or set the height of the printed region of the page. - Function: int stp_get_input_color_model (const stp_vars_t VV) - Function: void stp_set_input_color_model (stp_vars_t VV, int VAL) Get or set the color model (currently RGB or CMY) of the input to the driver. Most front ends will use RGB input. - Function: int stp_get_output_color_model (const stp_vars_t VV) - Function: void stp_set_output_color_model (stp_vars_t VV, int VAL) Get or set the color model (currently RGB or CMY) of the output of the driver. Most printers will use CMY. - Function: float stp_get_scaling (const stp_vars_t VV) - Function: void stp_set_scaling (stp_vars_t VV, float VAL) Get or set the scaling factor of the image. If the scaling factor is greater than 0, it is interpreted as a percent (5.0-100.0 is the valid range) of the printable page region, using the more restrictive axis. For example, if the image to be printed should be 3" (wide) x 2" (high), and the printable page region is 8"x10.5", the scale factor should be 37.5 (3"/8"). If the scaling is less than zero, it is interpreted as pixels per inch. It is likely that in the future this will be migrated into the front end. There is no particular reason why the driver needs to know about this. - Function: float stp_get_gamma (const stp_vars_t VV) - Function: void stp_set_gamma (stp_vars_t VV, float VAL) Get or set the gamma of the print job (valid range: 0.1-4.0; default 1.0). Note that this is not the absolute gamma used by the print job; it is scaled by the gamma appropriate for the printer. This is true for all of the numerical parameters. - Function: float stp_get_brightness (const stp_vars_t VV) - Function: void stp_set_brightness (stp_vars_t VV, float VAL) Get or set the brightness of the print job (valid range: 0.0-2.0; default: 1.0). Any value other than 1.0 will result in some possible values not being used; if brightness is less than 1.0, no output point will be pure white, and if brightness is greater than 1.0, no output point will be pure black (or cyan, or magenta, or yellow). - Function: float stp_get_contrast (const stp_vars_t VV) - Function: void stp_set_contrast (stp_vars_t VV, float VAL) Get or set the contrast of the print job (valid range: 0.0-4.0; default: 1.0). Values less than 1.0 will result in pure white or black not being used (0.0 will make the entire image 50% gray). Values greater than 1.0 do not hard clip; while the contrast in the midtones increases, it only asymptotically approaches the limits. - Function: float stp_get_cyan (const stp_vars_t VV) - Function: void stp_set_cyan (stp_vars_t VV, float VAL) Get or set the cyan adjustment of the print job (range: 0.0-4.0; default: 1.0). This currently adjusts the gamma of the cyan curve. It is scaled by the cyan adjustment for the printer model in question. - Function: float stp_get_magenta (const stp_vars_t VV) - Function: void stp_set_magenta (stp_vars_t VV, float VAL) Get or set the magenta adjustment of the print job (range: 0.0-4.0; default: 1.0). This currently adjusts the gamma of the magenta curve. It is scaled by the magenta adjustment for the printer model in question. - Function: float stp_get_yellow (const stp_vars_t VV) - Function: void stp_set_yellow (stp_vars_t VV, float VAL) Get or set the yellow adjustment of the print job (range: 0.0-4.0; default: 1.0). This currently adjusts the gamma of the yellow curve. It is scaled by the yellow adjustment for the printer model in question. - Function: float stp_get_saturation (const stp_vars_t VV) - Function: void stp_set_saturation (stp_vars_t VV, float VAL) Get or set the saturation of the print job (range: 0.0-9.0; default: 1.0). Saturation of 0.0 produces grayscale output using composite (CMY or CMYK, as appropriate for the printer) color. - Function: float stp_get_density (const stp_vars_t VV) - Function: void stp_set_density (stp_vars_t VV, float VAL) Get or set the density of the print job (range: 0.0-2.0; default: 1.0). This adjusts the amount of ink deposited in a linear fashion for all channels. It is scaled by the density appropriate for the choice of printer, resolution, paper type, and other factors that the driver may deem appropriate. - Function: float stp_get_app_gamma (const stp_vars_t VV) - Function: void stp_set_app_gamma (stp_vars_t VV, float VAL) Get or set the gamma of the input (i. e. what the driving application uses). - Function: void * stp_get_lut (const stp_vars_t VV) - Function: void stp_set_lut (stp_vars_t VV, void *VAL) Get or set the color lookup table for the print job. This is useful outside of the library for computing a preview of the printed result. The lookup table itself should be treated as an opaque handle. - Function: unsigned char * stp_get_cmap (const stp_vars_t VV) - Function: void stp_set_cmap (stp_vars_t VV, unsigned char *VAL) Get or set the color map for the print job. This is a table of R,G,B values for 8-bit indexed input. This may be moved outside of the library in the future; in this case, the front end would be required to do its own mapping and supply true-color RGB to the driver. The following methods are used to perform output and error reporting by the driver. The driver supplies a stream of output bytes; the front end is responsible for providing methods that accept this output and handle it appropriately. - Function: stp_outfunc_t stp_get_outfunc (const stp_vars_t VV) - Function: void stp_set_outfunc (const stp_vars_t VV, stp_outfunc_t VAL) - Function: void * stp_get_outdata (const stp_vars_t VV) - Function: void stp_set_outdata (stp_vars_t VV, void *VAL) - Data type: stp_outfunc_t typedef void (*stp_outfunc_t) (void *data, const char *buffer, size_t bytes); Get or set the output function the driver will use. The front end must supply a suitable function for accepting the output data. The `stp_set_outdata' method provides a way of passing an appropriate object to the output function. - Function: stp_outfunc_t stp_get_errfunc (const stp_vars_t VV) - Function: void stp_set_errfunc (const stp_vars_t VV, stp_outfunc_t VAL) - Function: void * stp_get_errdata (const stp_vars_t VV) - Function: void stp_set_errdata (stp_vars_t VV, void *VAL) Get or set the error reporting function that the driver will use. This is used to report errors or debugging information, and must be supplied. A typical errfunc will simply print whatever it's passed to stderr. /* * hue_map is an array of 49 doubles representing the mapping of hue * from (0..6) to (0..6) in increments of .125. The hue_map is in CMY space, * so hue=0 is cyan. */ typedef void (*stp_convert_t)(const stp_vars_t vars, const unsigned char *in, unsigned short *out, int *zero_mask, int width, int bpp, const unsigned char *cmap, const double *hue_map, const double *lum_map, const double *sat_map); - Function: void stp_merge_printvars (stp_vars_t USER, const stp_vars_t PRINT) - Function: void stp_allocate_lut (stp_vars_t V, size_t STEPS) - Function: void stp_free_lut (stp_vars_t V) - Function: void stp_compute_lut (stp_vars_t V, size_t STEPS) File: gimpprint.info, Node: Dither functions, Next: Options functions, Prev: stp_vars_t functions, Up: Functions Dither functions ================ - Function: size_t stp_dither_algorithm_count (void) - Function: const char * stp_dither_algorithm_name (int ID) - Function: const char * stp_default_dither_algorithm (void)