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/*
* "$Id: rgb.c 7306 2008-02-15 00:52:38Z mike $"
*
* RGB color separation code for CUPS.
*
* Copyright 2007 by Apple Inc.
* Copyright 1993-2005 by Easy Software Products.
*
* These coded instructions, statements, and computer programs are the
* property of Apple Inc. and are protected by Federal copyright
* law. Distribution and use rights are outlined in the file "LICENSE.txt"
* which should have been included with this file. If this file is
* file is missing or damaged, see the license at "http://www.cups.org/".
*
* Contents:
*
* cupsRGBDelete() - Delete a color separation.
* cupsRGBDoGray() - Do a grayscale separation...
* cupsRGBDoRGB() - Do a RGB separation...
* cupsRGBLoad() - Load a RGB color profile from a PPD file.
* cupsRGBNew() - Create a new RGB color separation.
*/
/*
* Include necessary headers.
*/
#include "driver.h"
/*
* 'cupsRGBDelete()' - Delete a color separation.
*/
void
cupsRGBDelete(cups_rgb_t *rgbptr) /* I - Color separation */
{
if (rgbptr == NULL)
return;
free(rgbptr->colors[0][0][0]);
free(rgbptr->colors[0][0]);
free(rgbptr->colors[0]);
free(rgbptr->colors);
free(rgbptr);
}
/*
* 'cupsRGBDoGray()' - Do a grayscale separation...
*/
void
cupsRGBDoGray(cups_rgb_t *rgbptr,
/* I - Color separation */
const unsigned char *input,
/* I - Input grayscale pixels */
unsigned char *output,
/* O - Output Device-N pixels */
int num_pixels)
/* I - Number of pixels */
{
int i; /* Looping var */
int lastgray; /* Previous grayscale */
int xs, ys, zs, /* Current RGB row offsets */
g, gi, gm0, gm1;/* Current gray index and multipliers ... */
const unsigned char *color; /* Current color data */
int tempg; /* Current separation color */
int rgbsize; /* Separation data size */
/*
* Range check input...
*/
if (!rgbptr || !input || !output || num_pixels <= 0)
return;
/*
* Initialize variables used for the duration of the separation...
*/
lastgray = -1;
rgbsize = rgbptr->num_channels;
xs = rgbptr->cube_size * rgbptr->cube_size * rgbptr->num_channels;
ys = rgbptr->cube_size * rgbptr->num_channels;
zs = rgbptr->num_channels;
/*
* Loop through it all...
*/
while (num_pixels > 0)
{
/*
* See if the next pixel is a cached value...
*/
num_pixels --;
g = cups_srgb_lut[*input++];
if (g == lastgray)
{
/*
* Copy previous color and continue...
*/
memcpy(output, output - rgbptr->num_channels, rgbsize);
output += rgbptr->num_channels;
continue;
}
else if (g == 0x00 && rgbptr->cache_init)
{
/*
* Copy black color and continue...
*/
memcpy(output, rgbptr->black, rgbsize);
output += rgbptr->num_channels;
continue;
}
else if (g == 0xff && rgbptr->cache_init)
{
/*
* Copy white color and continue...
*/
memcpy(output, rgbptr->white, rgbsize);
output += rgbptr->num_channels;
continue;
}
/*
* Nope, figure this one out on our own...
*/
gi = rgbptr->cube_index[g];
gm0 = rgbptr->cube_mult[g];
gm1 = 256 - gm0;
color = rgbptr->colors[gi][gi][gi];
for (i = 0; i < rgbptr->num_channels; i ++, color ++)
{
tempg = (color[0] * gm0 + color[xs + ys + zs] * gm1) / 256;
if (tempg > 255)
*output++ = 255;
else if (tempg < 0)
*output++ = 0;
else
*output++ = tempg;
}
}
}
/*
* 'cupsRGBDoRGB()' - Do a RGB separation...
*/
void
cupsRGBDoRGB(cups_rgb_t *rgbptr,
/* I - Color separation */
const unsigned char *input,
/* I - Input RGB pixels */
unsigned char *output,
/* O - Output Device-N pixels */
int num_pixels)
/* I - Number of pixels */
{
int i; /* Looping var */
int rgb, /* Current RGB color */
lastrgb; /* Previous RGB color */
int r, ri, rm0, rm1, rs,
/* Current red index, multipliexs, and row offset */
g, gi, gm0, gm1, gs,
/* Current green ... */
b, bi, bm0, bm1, bs;
/* Current blue ... */
const unsigned char *color; /* Current color data */
int tempr, /* Current separation colors */
tempg, /* ... */
tempb ; /* ... */
int rgbsize; /* Separation data size */
/*
* Range check input...
*/
if (!rgbptr || !input || !output || num_pixels <= 0)
return;
/*
* Initialize variables used for the duration of the separation...
*/
lastrgb = -1;
rgbsize = rgbptr->num_channels;
rs = rgbptr->cube_size * rgbptr->cube_size * rgbptr->num_channels;
gs = rgbptr->cube_size * rgbptr->num_channels;
bs = rgbptr->num_channels;
/*
* Loop through it all...
*/
while (num_pixels > 0)
{
/*
* See if the next pixel is a cached value...
*/
num_pixels --;
r = cups_srgb_lut[*input++];
g = cups_srgb_lut[*input++];
b = cups_srgb_lut[*input++];
rgb = (((r << 8) | g) << 8) | b;
if (rgb == lastrgb)
{
/*
* Copy previous color and continue...
*/
memcpy(output, output - rgbptr->num_channels, rgbsize);
output += rgbptr->num_channels;
continue;
}
else if (rgb == 0x000000 && rgbptr->cache_init)
{
/*
* Copy black color and continue...
*/
memcpy(output, rgbptr->black, rgbsize);
output += rgbptr->num_channels;
continue;
}
else if (rgb == 0xffffff && rgbptr->cache_init)
{
/*
* Copy white color and continue...
*/
memcpy(output, rgbptr->white, rgbsize);
output += rgbptr->num_channels;
continue;
}
/*
* Nope, figure this one out on our own...
*/
ri = rgbptr->cube_index[r];
rm0 = rgbptr->cube_mult[r];
rm1 = 256 - rm0;
gi = rgbptr->cube_index[g];
gm0 = rgbptr->cube_mult[g];
gm1 = 256 - gm0;
bi = rgbptr->cube_index[b];
bm0 = rgbptr->cube_mult[b];
bm1 = 256 - bm0;
color = rgbptr->colors[ri][gi][bi];
for (i = rgbptr->num_channels; i > 0; i --, color ++)
{
tempb = (color[0] * bm0 + color[bs] * bm1) / 256;
tempg = tempb * gm0;
tempb = (color[gs] * gm0 + color[gs + bs] * bm1) / 256;
tempg = (tempg + tempb * gm1) / 256;
tempr = tempg * rm0;
tempb = (color[rs] * bm0 + color[rs + bs] * bm1) / 256;
tempg = tempb * gm0;
tempb = (color[rs + gs] * bm0 + color[rs + gs + bs] * bm1) / 256;
tempg = (tempg + tempb * gm1) / 256;
tempr = (tempr + tempg * rm1) / 256;
if (tempr > 255)
*output++ = 255;
else if (tempr < 0)
*output++ = 0;
else
*output++ = tempr;
}
}
}
/*
* 'cupsRGBLoad()' - Load a RGB color profile from a PPD file.
*/
cups_rgb_t * /* O - New color profile */
cupsRGBLoad(ppd_file_t *ppd, /* I - PPD file */
const char *colormodel, /* I - Color model */
const char *media, /* I - Media type */
const char *resolution) /* I - Resolution */
{
int i, /* Looping var */
cube_size, /* Size of color lookup cube */
num_channels, /* Number of color channels */
num_samples; /* Number of color samples */
cups_sample_t *samples; /* Color samples */
float values[7]; /* Color sample values */
char spec[PPD_MAX_NAME]; /* Profile name */
ppd_attr_t *attr; /* Attribute from PPD file */
cups_rgb_t *rgbptr; /* RGB color profile */
/*
* Find the following attributes:
*
* cupsRGBProfile - Specifies the cube size, number of channels, and
* number of samples
* cupsRGBSample - Specifies an RGB to CMYK color sample
*/
if ((attr = cupsFindAttr(ppd, "cupsRGBProfile", colormodel, media,
resolution, spec, sizeof(spec))) == NULL)
{
fputs("DEBUG2: No cupsRGBProfile attribute found for the current settings!\n", stderr);
return (NULL);
}
if (!attr->value || sscanf(attr->value, "%d%d%d", &cube_size, &num_channels,
&num_samples) != 3)
{
fprintf(stderr, "ERROR: Bad cupsRGBProfile attribute \'%s\'!\n",
attr->value ? attr->value : "(null)");
return (NULL);
}
if (cube_size < 2 || cube_size > 16 ||
num_channels < 1 || num_channels > CUPS_MAX_RGB ||
num_samples != (cube_size * cube_size * cube_size))
{
fprintf(stderr, "ERROR: Bad cupsRGBProfile attribute \'%s\'!\n",
attr->value);
return (NULL);
}
/*
* Allocate memory for the samples and read them...
*/
if ((samples = calloc(num_samples, sizeof(cups_sample_t))) == NULL)
{
fputs("ERROR: Unable to allocate memory for RGB profile!\n", stderr);
return (NULL);
}
/*
* Read all of the samples...
*/
for (i = 0; i < num_samples; i ++)
if ((attr = ppdFindNextAttr(ppd, "cupsRGBSample", spec)) == NULL)
break;
else if (!attr->value)
{
fputs("ERROR: Bad cupsRGBSample value!\n", stderr);
break;
}
else if (sscanf(attr->value, "%f%f%f%f%f%f%f", values + 0,
values + 1, values + 2, values + 3, values + 4, values + 5,
values + 6) != (3 + num_channels))
{
fputs("ERROR: Bad cupsRGBSample value!\n", stderr);
break;
}
else
{
samples[i].rgb[0] = (int)(255.0 * values[0] + 0.5);
samples[i].rgb[1] = (int)(255.0 * values[1] + 0.5);
samples[i].rgb[2] = (int)(255.0 * values[2] + 0.5);
samples[i].colors[0] = (int)(255.0 * values[3] + 0.5);
if (num_channels > 1)
samples[i].colors[1] = (int)(255.0 * values[4] + 0.5);
if (num_channels > 2)
samples[i].colors[2] = (int)(255.0 * values[5] + 0.5);
if (num_channels > 3)
samples[i].colors[3] = (int)(255.0 * values[6] + 0.5);
}
/*
* If everything went OK, create the color profile...
*/
if (i == num_samples)
rgbptr = cupsRGBNew(num_samples, samples, cube_size, num_channels);
else
rgbptr = NULL;
/*
* Free the temporary sample array and return...
*/
free(samples);
return (rgbptr);
}
/*
* 'cupsRGBNew()' - Create a new RGB color separation.
*/
cups_rgb_t * /* O - New color separation or NULL */
cupsRGBNew(int num_samples, /* I - Number of samples */
cups_sample_t *samples, /* I - Samples */
int cube_size, /* I - Size of LUT cube */
int num_channels) /* I - Number of color components */
{
cups_rgb_t *rgbptr; /* New color separation */
int i; /* Looping var */
int r, g, b; /* Current RGB */
int tempsize; /* Sibe of main arrays */
unsigned char *tempc; /* Pointer for C arrays */
unsigned char **tempb ; /* Pointer for Z arrays */
unsigned char ***tempg; /* Pointer for Y arrays */
unsigned char ****tempr; /* Pointer for X array */
unsigned char rgb[3]; /* Temporary RGB value */
/*
* Range-check the input...
*/
if (!samples || num_samples != (cube_size * cube_size * cube_size) ||
num_channels <= 0 || num_channels > CUPS_MAX_RGB)
return (NULL);
/*
* Allocate memory for the separation...
*/
if ((rgbptr = calloc(1, sizeof(cups_rgb_t))) == NULL)
return (NULL);
/*
* Allocate memory for the samples and the LUT cube...
*/
tempsize = cube_size * cube_size * cube_size; /* FUTURE: num_samples < cs^3 */
tempc = calloc(tempsize, num_channels);
tempb = calloc(tempsize, sizeof(unsigned char *));
tempg = calloc(cube_size * cube_size, sizeof(unsigned char **));
tempr = calloc(cube_size, sizeof(unsigned char ***));
if (tempc == NULL || tempb == NULL || tempg == NULL || tempr == NULL)
{
free(rgbptr);
if (tempc)
free(tempc);
if (tempb)
free(tempb);
if (tempg)
free(tempg);
if (tempr)
free(tempr);
return (NULL);
}
/*
* Fill in the arrays...
*/
for (i = 0, r = 0; r < cube_size; r ++)
{
tempr[r] = tempg + r * cube_size;
for (g = 0; g < cube_size; g ++)
{
tempr[r][g] = tempb + i;
for (b = 0; b < cube_size; b ++, i ++)
tempr[r][g][b] = tempc + i * num_channels;
}
}
for (i = 0; i < num_samples; i ++)
{
r = samples[i].rgb[0] * (cube_size - 1) / 255;
g = samples[i].rgb[1] * (cube_size - 1) / 255;
b = samples[i].rgb[2] * (cube_size - 1) / 255;
memcpy(tempr[r][g][b], samples[i].colors, num_channels);
}
rgbptr->cube_size = cube_size;
rgbptr->num_channels = num_channels;
rgbptr->colors = tempr;
/*
* Generate the lookup tables for the cube indices and multipliers...
*/
for (i = 0; i < 256; i ++)
{
rgbptr->cube_index[i] = i * (cube_size - 1) / 256;
if (i == 0)
rgbptr->cube_mult[i] = 256;
else
rgbptr->cube_mult[i] = 255 - ((i * (cube_size - 1)) & 255);
}
/*
* Generate the black and white cache values for the separation...
*/
rgb[0] = 0;
rgb[1] = 0;
rgb[2] = 0;
cupsRGBDoRGB(rgbptr, rgb, rgbptr->black, 1);
rgb[0] = 255;
rgb[1] = 255;
rgb[2] = 255;
cupsRGBDoRGB(rgbptr, rgb, rgbptr->white, 1);
rgbptr->cache_init = 1;
/*
* Return the separation...
*/
return (rgbptr);
}
/*
* End of "$Id: rgb.c 7306 2008-02-15 00:52:38Z mike $".
*/
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