cupsfilters/driver.h

   1 /*
   2  * "$Id$"
   3  *
   4  *   Printer driver utilities header file for CUPS.
   5  *
   6  *   Copyright 2007 by Apple Inc.
   7  *   Copyright 1993-2005 by Easy Software Products.
   8  *
   9  *   These coded instructions, statements, and computer programs are the
  10  *   property of Apple Inc. and are protected by Federal copyright
  11  *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  12  *   which should have been included with this file.  If this file is
  13  *   file is missing or damaged, see the license at "http://www.cups.org/".
  14  */
  15
  16 #ifndef _CUPS_DRIVER_H_
  17 #  define _CUPS_DRIVER_H_
  18
  19 #  ifdef __cplusplus
  20 extern "C" {
  21 #  endif /* __cplusplus */
  22
  23 /*
  24  * Include necessary headers...
  25  */
  26
  27 #  include <stdio.h>
  28 #  include <stdlib.h>
  29 #  include <time.h>
  30 #  include <math.h>
  31
  32 #  if defined(WIN32) || defined(__EMX__)
  33 #    include <io.h>
  34 #  else
  35 #    include <unistd.h>
  36 #    include <fcntl.h>
  37 #  endif /* WIN32 || __EMX__ */
  38
  39 #  include <cups/cups.h>
  40 #  include <cups/raster.h>
  41
  42
  43 /*
  44  * Common macros...
  45  */
  46
  47 #  ifndef min
  48 #    define min(a,b)    ((a) < (b) ? (a) : (b))
  49 #    define max(a,b)    ((a) > (b) ? (a) : (b))
  50 #  endif /* !min */
  51
  52
  53 /*
  54  * Constants...
  55  */
  56
  57 #define CUPS_MAX_CHAN   15              /* Maximum number of color components */
  58 #define CUPS_MAX_LUT    4095            /* Maximum LUT value */
  59 #define CUPS_MAX_RGB    4               /* Maximum number of sRGB components */
  60
  61
  62 /*
  63  * Types/structures for the various routines.
  64  */
  65
  66 typedef struct cups_lut_s               /**** Lookup Table for Dithering ****/
  67 {
  68   short         intensity;              /* Adjusted intensity */
  69   short         pixel;                  /* Output pixel value */
  70   int           error;                  /* Error from desired value */
  71 } cups_lut_t;
  72
  73 typedef struct cups_dither_s            /**** Dithering State ****/
  74 {
  75   int           width;                  /* Width of buffer */
  76   int           row;                    /* Current row */
  77   int           errors[96];             /* Error values */
  78 } cups_dither_t;
  79
  80 typedef struct cups_sample_s            /**** Color sample point ****/
  81 {
  82   unsigned char rgb[3];                 /* sRGB values */
  83   unsigned char colors[CUPS_MAX_RGB];   /* Color values */
  84 } cups_sample_t;
  85
  86 typedef struct cups_rgb_s               /**** Color separation lookup table ****/
  87 {
  88   int           cube_size;              /* Size of color cube (2-N) on a side */
  89   int           num_channels;           /* Number of colors per sample */
  90   unsigned char ****colors;             /* 4-D array of sample values */
  91   int           cube_index[256];        /* Index into cube for a given sRGB value */
  92   int           cube_mult[256];         /* Multiplier value for a given sRGB value */
  93   int           cache_init;             /* Are cached values initialized? */
  94   unsigned char black[CUPS_MAX_RGB];    /* Cached black (sRGB = 0,0,0) */
  95   unsigned char white[CUPS_MAX_RGB];    /* Cached white (sRGB = 255,255,255) */
  96 } cups_rgb_t;
  97
  98 typedef struct cups_cmyk_s              /**** Simple CMYK lookup table ****/
  99 {
 100   unsigned char black_lut[256];         /* Black generation LUT */
 101   unsigned char color_lut[256];         /* Color removal LUT */
 102   int           ink_limit;              /* Ink limit */
 103   int           num_channels;           /* Number of components */
 104   short         *channels[CUPS_MAX_CHAN];
 105                                         /* Lookup tables */
 106 } cups_cmyk_t;
 107
 108
 109 /*
 110  * Globals...
 111  */
 112
 113 extern const unsigned char
 114                         cups_srgb_lut[256];
 115                                         /* sRGB gamma lookup table */
 116 extern const unsigned char
 117                         cups_scmy_lut[256];
 118                                         /* sRGB gamma lookup table (inverted) */
 119
 120
 121 /*
 122  * Prototypes...
 123  */
 124
 125 /*
 126  * Attribute function...
 127  */
 128
 129 extern ppd_attr_t       *cupsFindAttr(ppd_file_t *ppd, const char *name,
 130                                       const char *colormodel,
 131                                       const char *media,
 132                                       const char *resolution,
 133                                       char *spec, int specsize);
 134
 135 /*
 136  * Byte checking functions...
 137  */
 138
 139 extern int              cupsCheckBytes(const unsigned char *, int);
 140 extern int              cupsCheckValue(const unsigned char *, int,
 141                                        const unsigned char);
 142
 143 /*
 144  * Dithering functions...
 145  */
 146
 147 extern void             cupsDitherLine(cups_dither_t *d, const cups_lut_t *lut,
 148                                        const short *data, int num_channels,
 149                                        unsigned char *p);
 150 extern cups_dither_t    *cupsDitherNew(int width);
 151 extern void             cupsDitherDelete(cups_dither_t *);
 152
 153 /*
 154  * Lookup table functions for dithering...
 155  */
 156
 157 extern cups_lut_t       *cupsLutNew(int num_vals, const float *vals);
 158 extern void             cupsLutDelete(cups_lut_t *lut);
 159 extern cups_lut_t       *cupsLutLoad(ppd_file_t *ppd,
 160                                      const char *colormodel,
 161                                      const char *media,
 162                                      const char *resolution,
 163                                      const char *ink);
 164
 165
 166 /*
 167  * Bit packing functions...
 168  */
 169
 170 extern void             cupsPackHorizontal(const unsigned char *,
 171                                            unsigned char *, int,
 172                                            const unsigned char, const int);
 173 extern void             cupsPackHorizontal2(const unsigned char *,
 174                                             unsigned char *, int, const int);
 175 extern void             cupsPackHorizontalBit(const unsigned char *,
 176                                               unsigned char *, int,
 177                                               const unsigned char,
 178                                               const unsigned char);
 179 extern void             cupsPackVertical(const unsigned char *, unsigned char *,
 180                                          int, const unsigned char, const int);
 181
 182 /*
 183  * Color separation functions...
 184  */
 185
 186 extern void             cupsRGBDelete(cups_rgb_t *rgb);
 187 extern void             cupsRGBDoGray(cups_rgb_t *rgb,
 188                                       const unsigned char *input,
 189                                       unsigned char *output, int num_pixels);
 190 extern void             cupsRGBDoRGB(cups_rgb_t *rgb,
 191                                      const unsigned char *input,
 192                                      unsigned char *output, int num_pixels);
 193 extern cups_rgb_t       *cupsRGBLoad(ppd_file_t *ppd,
 194                                      const char *colormodel,
 195                                      const char *media,
 196                                      const char *resolution);
 197 extern cups_rgb_t       *cupsRGBNew(int num_samples, cups_sample_t *samples,
 198                                     int cube_size, int num_channels);
 199
 200 /*
 201  * CMYK separation functions...
 202  */
 203
 204 extern cups_cmyk_t      *cupsCMYKNew(int num_channels);
 205 extern void             cupsCMYKDelete(cups_cmyk_t *cmyk);
 206 extern void             cupsCMYKDoBlack(const cups_cmyk_t *cmyk,
 207                                         const unsigned char *input,
 208                                         short *output, int num_pixels);
 209 extern void             cupsCMYKDoCMYK(const cups_cmyk_t *cmyk,
 210                                        const unsigned char *input,
 211                                        short *output, int num_pixels);
 212 extern void             cupsCMYKDoGray(const cups_cmyk_t *cmyk,
 213                                        const unsigned char *input,
 214                                        short *output, int num_pixels);
 215 extern void             cupsCMYKDoRGB(const cups_cmyk_t *cmyk,
 216                                       const unsigned char *input,
 217                                       short *output, int num_pixels);
 218 extern cups_cmyk_t      *cupsCMYKLoad(ppd_file_t *ppd,
 219                                       const char *colormodel,
 220                                       const char *media,
 221                                       const char *resolution);
 222 extern void             cupsCMYKSetBlack(cups_cmyk_t *cmyk,
 223                                          float lower, float upper);
 224 extern void             cupsCMYKSetCurve(cups_cmyk_t *cmyk, int channel,
 225                                          int num_xypoints,
 226                                          const float *xypoints);
 227 extern void             cupsCMYKSetGamma(cups_cmyk_t *cmyk, int channel,
 228                                          float gamval, float density);
 229 extern void             cupsCMYKSetInkLimit(cups_cmyk_t *cmyk, float limit);
 230 extern void             cupsCMYKSetLtDk(cups_cmyk_t *cmyk, int channel,
 231                                         float light, float dark);
 232
 233
 234 /*
 235  * Convenience macro for writing print data...
 236  */
 237
 238 #  define cupsWritePrintData(s,n) fwrite((s), 1, (n), stdout)
 239
 240 #  ifdef __cplusplus
 241 }
 242 #  endif /* __cplusplus */
 243
 244 #endif /* !_CUPS_DRIVER_H_ */
 245
 246 /*
 247  * End of "$Id$".
 248  */
 249