[imager.git] / img16.c

/*
=head1 NAME

img16.c - implements 16-bit images

=head1 SYNOPSIS

  i_img *im = i_img_16_new(int x, int y, int channels);
  # use like a normal image

=head1 DESCRIPTION

Implements 16-bit/sample images.

This basic implementation is required so that we have some larger 
sample image type to work with.

=over

=cut
*/

#include "image.h"
#include "imagei.h"

static int i_ppix_d16(i_img *im, int x, int y, i_color *val);
static int i_gpix_d16(i_img *im, int x, int y, i_color *val);
static int i_glin_d16(i_img *im, int l, int r, int y, i_color *vals);
static int i_plin_d16(i_img *im, int l, int r, int y, i_color *vals);
static int i_ppixf_d16(i_img *im, int x, int y, i_fcolor *val);
static int i_gpixf_d16(i_img *im, int x, int y, i_fcolor *val);
static int i_glinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals);
static int i_plinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals);
static int i_gsamp_d16(i_img *im, int l, int r, int y, i_sample_t *samps, 
                       int *chans, int chan_count);
static int i_gsampf_d16(i_img *im, int l, int r, int y, i_fsample_t *samps, 
                        int *chans, int chan_count);

/*
=item IIM_base_16bit_direct

Base structure used to initialize a 16-bit/sample image.

Internal.

=cut
*/
static i_img IIM_base_16bit_direct =
{
  0, /* channels set */
  0, 0, 0, /* xsize, ysize, bytes */
  ~0U, /* ch_mask */
  i_16_bits, /* bits */
  i_direct_type, /* type */
  0, /* virtual */
  NULL, /* idata */
  { 0, 0, NULL }, /* tags */
  NULL, /* ext_data */

  i_ppix_d16, /* i_f_ppix */
  i_ppixf_d16, /* i_f_ppixf */
  i_plin_d16, /* i_f_plin */
  i_plinf_d16, /* i_f_plinf */
  i_gpix_d16, /* i_f_gpix */
  i_gpixf_d16, /* i_f_gpixf */
  i_glin_d16, /* i_f_glin */
  i_glinf_d16, /* i_f_glinf */
  i_gsamp_d16, /* i_f_gsamp */
  i_gsampf_d16, /* i_f_gsampf */

  NULL, /* i_f_gpal */
  NULL, /* i_f_ppal */
  NULL, /* i_f_addcolor */
  NULL, /* i_f_getcolor */
  NULL, /* i_f_colorcount */
  NULL, /* i_f_findcolor */

  NULL, /* i_f_destroy */
};

/* it's possible some platforms won't have a 16-bit integer type,
   so we check for one otherwise we work by bytes directly

   We do assume 8-bit char
*/
#if __STDC_VERSION__ >= 199901L
/* C99 should define something useful */
#include <stdint.h>
#ifdef UINT16_MAX
typedef uint16_t i_sample16_t;
#define GOT16
#endif
#endif

/* check out unsigned short */
#ifndef GOT16
#include <limits.h>
#if USHRT_MAX == 65535
typedef unsigned short i_sample16_t;
#define GOT16
#endif
#endif

#ifdef GOT16

/* we have a real 16-bit unsigned integer */
#define STORE16(bytes, offset, word) \
   (((i_sample16_t *)(bytes))[offset] = (word))
#define STORE8as16(bytes, offset, byte) \
   (((i_sample16_t *)(bytes))[offset] = (byte) * 256)
#define GET16(bytes, offset) \
     (((i_sample16_t *)(bytes))[offset])
#define GET16as8(bytes, offset) \
     (((i_sample16_t *)(bytes))[offset] / 256)

#else

/* we have to do this the hard way */
#define STORE16(bytes, offset, word) \
   ((((unsigned char *)(bytes))[(offset)*2] = (word) >> 8), \
    (((unsigned char *)(bytes))[(offset)*2+1] = (word) & 0xFF))
#define STORE8as16(bytes, offset, byte) \
   ((((unsigned char *)(bytes))[(offset)*2] = (byte)), \
    (((unsigned char *)(bytes))[(offset)*2+1] = 0))
   
#define GET16(bytes, offset) \
   (((unsigned char *)(bytes))[(offset)*2] * 256 \
    + ((unsigned char *)(bytes))[(offset)*2+1])
#define GET16as8(bytes, offset) \
   (((unsigned char *)(bytes))[(offset)*2] << 8)

#endif

/*
=item i_img_16_new(int x, int y, int ch)

Creates a new 16-bit per sample image.

=cut
*/
i_img *i_img_16_new_low(i_img *im, int x, int y, int ch) {
  mm_log((1,"i_img_16_new(x %d, y %d, ch %d)\n", x, y, ch));
  
  *im = IIM_base_16bit_direct;
  i_tags_new(&im->tags);
  im->xsize = x;
  im->ysize = y;
  im->channels = ch;
  im->bytes = x * y * ch * 2;
  im->ext_data = NULL;
  im->idata = mymalloc(im->bytes);
  if (im->idata) {
    memset(im->idata, 0, im->bytes);
  }
  else {
    i_tags_destroy(&im->tags);
    im = NULL;
  }
  
  return im;
}

i_img *i_img_16_new(int x, int y, int ch) {
  i_img *im;

  im = mymalloc(sizeof(i_img));
  if (im) {
    if (!i_img_16_new_low(im, x, y, ch)) {
      myfree(im);
      im = NULL;
    }
  }
  
  mm_log((1, "(%p) <- i_img_16_new\n", im));
  
  return im;
}

static int i_ppix_d16(i_img *im, int x, int y, i_color *val) {
  int off, ch;

  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
    return -1;

  off = (x + y * im->xsize) * im->channels;
  for (ch = 0; ch < im->channels; ++ch)
    STORE8as16(im->idata, off+ch, val->channel[ch]);

  return 0;
}

static int i_gpix_d16(i_img *im, int x, int y, i_color *val) {
  int off, ch;

  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
    return -1;

  off = (x + y * im->xsize) * im->channels;
  for (ch = 0; ch < im->channels; ++ch)
    val->channel[ch] = GET16as8(im->idata, off+ch);

  return 0;
}

static int i_ppixf_d16(i_img *im, int x, int y, i_fcolor *val) {
  int off, ch;

  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
    return -1;

  off = (x + y * im->xsize) * im->channels;
  for (ch = 0; ch < im->channels; ++ch)
    STORE16(im->idata, off+ch, SampleFTo16(val->channel[ch]));

  return 0;
}

static int i_gpixf_d16(i_img *im, int x, int y, i_fcolor *val) {
  int off, ch;

  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
    return -1;

  off = (x + y * im->xsize) * im->channels;
  for (ch = 0; ch < im->channels; ++ch)
    val->channel[ch] = Sample16ToF(GET16(im->idata, off+ch));

  return 0;
}

static int i_glin_d16(i_img *im, int l, int r, int y, i_color *vals) {
  int ch, count, i;
  int off;
  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
    if (r > im->xsize)
      r = im->xsize;
    off = (l+y*im->xsize) * im->channels;
    count = r - l;
    for (i = 0; i < count; ++i) {
      for (ch = 0; ch < im->channels; ++ch) {
	vals[i].channel[ch] = GET16as8(im->idata, off);
        ++off;
      }
    }
    return count;
  }
  else {
    return 0;
  }
}

static int i_plin_d16(i_img *im, int l, int r, int y, i_color *vals) {
  int ch, count, i;
  int off;
  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
    if (r > im->xsize)
      r = im->xsize;
    off = (l+y*im->xsize) * im->channels;
    count = r - l;
    for (i = 0; i < count; ++i) {
      for (ch = 0; ch < im->channels; ++ch) {
        STORE8as16(im->idata, off, vals[i].channel[ch]);
        ++off;
      }
    }
    return count;
  }
  else {
    return 0;
  }
}

static int i_glinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals) {
  int ch, count, i;
  int off;
  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
    if (r > im->xsize)
      r = im->xsize;
    off = (l+y*im->xsize) * im->channels;
    count = r - l;
    for (i = 0; i < count; ++i) {
      for (ch = 0; ch < im->channels; ++ch) {
	vals[i].channel[ch] = Sample16ToF(GET16(im->idata, off));
        ++off;
      }
    }
    return count;
  }
  else {
    return 0;
  }
}

static int i_plinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals) {
  int ch, count, i;
  int off;
  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
    if (r > im->xsize)
      r = im->xsize;
    off = (l+y*im->xsize) * im->channels;
    count = r - l;
    for (i = 0; i < count; ++i) {
      for (ch = 0; ch < im->channels; ++ch) {
        STORE16(im->idata, off, SampleFTo16(vals[i].channel[ch]));
        ++off;
      }
    }
    return count;
  }
  else {
    return 0;
  }
}

static int i_gsamp_d16(i_img *im, int l, int r, int y, i_sample_t *samps, 
                       int *chans, int chan_count) {
  int ch, count, i, w;
  int off;

  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
    if (r > im->xsize)
      r = im->xsize;
    off = (l+y*im->xsize) * im->channels;
    w = r - l;
    count = 0;

    if (chans) {
      /* make sure we have good channel numbers */
      for (ch = 0; ch < chan_count; ++ch) {
        if (chans[ch] < 0 || chans[ch] >= im->channels) {
          i_push_errorf(0, "No channel %d in this image", chans[ch]);
          return 0;
        }
      }
      for (i = 0; i < w; ++i) {
        for (ch = 0; ch < chan_count; ++ch) {
          *samps++ = GET16as8(im->idata, off+chans[ch]);
          ++count;
        }
        off += im->channels;
      }
    }
    else {
      for (i = 0; i < w; ++i) {
        for (ch = 0; ch < chan_count; ++ch) {
          *samps++ = GET16as8(im->idata, off+ch);
          ++count;
        }
        off += im->channels;
      }
    }

    return count;
  }
  else {
    return 0;
  }
}

static int i_gsampf_d16(i_img *im, int l, int r, int y, i_fsample_t *samps, 
                        int *chans, int chan_count) {
  int ch, count, i, w;
  int off;

  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
    if (r > im->xsize)
      r = im->xsize;
    off = (l+y*im->xsize) * im->channels;
    w = r - l;
    count = 0;

    if (chans) {
      /* make sure we have good channel numbers */
      for (ch = 0; ch < chan_count; ++ch) {
        if (chans[ch] < 0 || chans[ch] >= im->channels) {
          i_push_errorf(0, "No channel %d in this image", chans[ch]);
          return 0;
        }
      }
      for (i = 0; i < w; ++i) {
        for (ch = 0; ch < chan_count; ++ch) {
          *samps++ = Sample16ToF(GET16(im->idata, off+chans[ch]));
          ++count;
        }
        off += im->channels;
      }
    }
    else {
      for (i = 0; i < w; ++i) {
        for (ch = 0; ch < chan_count; ++ch) {
          *samps++ = Sample16ToF(GET16(im->idata, off+ch));
          ++count;
        }
        off += im->channels;
      }
    }

    return count;
  }
  else {
    return 0;
  }
}

/*
=back

=head1 AUTHOR

Tony Cook <tony@develop-help.com>

=head1 SEE ALSO

Imager(3)

=cut
*/
Commit	Line	Data
faa9b3e7 TC	1	/*
	2	=head1 NAME
	3
	4	img16.c - implements 16-bit images
	5
	6	=head1 SYNOPSIS
	7
	8	i_img *im = i_img_16_new(int x, int y, int channels);
	9	# use like a normal image
	10
	11	=head1 DESCRIPTION
	12
	13	Implements 16-bit/sample images.
	14
	15	This basic implementation is required so that we have some larger
	16	sample image type to work with.
	17
	18	=over
	19
	20	=cut
	21	*/
	22
	23	#include "image.h"
	24	#include "imagei.h"
	25
	26	static int i_ppix_d16(i_img im, int x, int y, i_color val);
	27	static int i_gpix_d16(i_img im, int x, int y, i_color val);
	28	static int i_glin_d16(i_img im, int l, int r, int y, i_color vals);
	29	static int i_plin_d16(i_img im, int l, int r, int y, i_color vals);
	30	static int i_ppixf_d16(i_img im, int x, int y, i_fcolor val);
	31	static int i_gpixf_d16(i_img im, int x, int y, i_fcolor val);
	32	static int i_glinf_d16(i_img im, int l, int r, int y, i_fcolor vals);
	33	static int i_plinf_d16(i_img im, int l, int r, int y, i_fcolor vals);
	34	static int i_gsamp_d16(i_img im, int l, int r, int y, i_sample_t samps,
	35	int *chans, int chan_count);
	36	static int i_gsampf_d16(i_img im, int l, int r, int y, i_fsample_t samps,
	37	int *chans, int chan_count);
	38
	39	/*
	40	=item IIM_base_16bit_direct
	41
	42	Base structure used to initialize a 16-bit/sample image.
	43
	44	Internal.
	45
	46	=cut
	47	*/
	48	static i_img IIM_base_16bit_direct =
	49	{
	50	0, /* channels set */
	51	0, 0, 0, /* xsize, ysize, bytes */
9a88a5e6	52	~0U, /* ch_mask */
faa9b3e7 TC	53	i_16_bits, /* bits */
	54	i_direct_type, /* type */
	55	0, /* virtual */
	56	NULL, /* idata */
	57	{ 0, 0, NULL }, /* tags */
	58	NULL, /* ext_data */
	59
	60	i_ppix_d16, /* i_f_ppix */
	61	i_ppixf_d16, /* i_f_ppixf */
	62	i_plin_d16, /* i_f_plin */
	63	i_plinf_d16, /* i_f_plinf */
	64	i_gpix_d16, /* i_f_gpix */
	65	i_gpixf_d16, /* i_f_gpixf */
	66	i_glin_d16, /* i_f_glin */
	67	i_glinf_d16, /* i_f_glinf */
	68	i_gsamp_d16, /* i_f_gsamp */
	69	i_gsampf_d16, /* i_f_gsampf */
	70
	71	NULL, /* i_f_gpal */
	72	NULL, /* i_f_ppal */
	73	NULL, /* i_f_addcolor */
	74	NULL, /* i_f_getcolor */
	75	NULL, /* i_f_colorcount */
	76	NULL, /* i_f_findcolor */
	77
	78	NULL, /* i_f_destroy */
	79	};
	80
	81	/* it's possible some platforms won't have a 16-bit integer type,
	82	so we check for one otherwise we work by bytes directly
	83
	84	We do assume 8-bit char
	85	*/
	86	#if __STDC_VERSION__ >= 199901L
	87	/* C99 should define something useful */
	88	#include <stdint.h>
	89	#ifdef UINT16_MAX
	90	typedef uint16_t i_sample16_t;
	91	#define GOT16
	92	#endif
	93	#endif
	94
	95	/* check out unsigned short */
	96	#ifndef GOT16
	97	#include <limits.h>
	98	#if USHRT_MAX == 65535
	99	typedef unsigned short i_sample16_t;
	100	#define GOT16
	101	#endif
	102	#endif
	103
	104	#ifdef GOT16
	105
	106	/* we have a real 16-bit unsigned integer */
	107	#define STORE16(bytes, offset, word) \
	108	(((i_sample16_t *)(bytes))[offset] = (word))
	109	#define STORE8as16(bytes, offset, byte) \
	110	(((i_sample16_t )(bytes))[offset] = (byte) 256)
	111	#define GET16(bytes, offset) \
	112	(((i_sample16_t *)(bytes))[offset])
	113	#define GET16as8(bytes, offset) \
	114	(((i_sample16_t *)(bytes))[offset] / 256)
	115
	116	#else
117
118	/* we have to do this the hard way */
119	#define STORE16(bytes, offset, word) \
120	((((unsigned char )(bytes))[(offset)2] = (word) >> 8), \
121	(((unsigned char )(bytes))[(offset)2+1] = (word) & 0xFF))
122	#define STORE8as16(bytes, offset, byte) \
123	((((unsigned char )(bytes))[(offset)2] = (byte)), \
124	(((unsigned char )(bytes))[(offset)2+1] = 0))
125
126	#define GET16(bytes, offset) \
127	(((unsigned char )(bytes))[(offset)2] * 256 \
128	+ ((unsigned char )(bytes))[(offset)2+1])
129	#define GET16as8(bytes, offset) \
130	(((unsigned char )(bytes))[(offset)2] << 8)
131
132	#endif
133
134	/*
135	=item i_img_16_new(int x, int y, int ch)
136
137	Creates a new 16-bit per sample image.
365ea842 TC	138
365ea842 TC	139	=cut
faa9b3e7 TC	140	*/
	141	i_img i_img_16_new_low(i_img im, int x, int y, int ch) {
	142	mm_log((1,"i_img_16_new(x %d, y %d, ch %d)\n", x, y, ch));
	143
	144	*im = IIM_base_16bit_direct;
	145	i_tags_new(&im->tags);
	146	im->xsize = x;
	147	im->ysize = y;
	148	im->channels = ch;
	149	im->bytes = x * y * ch * 2;
	150	im->ext_data = NULL;
	151	im->idata = mymalloc(im->bytes);
	152	if (im->idata) {
	153	memset(im->idata, 0, im->bytes);
	154	}
	155	else {
	156	i_tags_destroy(&im->tags);
	157	im = NULL;
	158	}
	159
	160	return im;
	161	}
	162
	163	i_img *i_img_16_new(int x, int y, int ch) {
	164	i_img *im;
	165
	166	im = mymalloc(sizeof(i_img));
	167	if (im) {
	168	if (!i_img_16_new_low(im, x, y, ch)) {
	169	myfree(im);
	170	im = NULL;
	171	}
	172	}
	173
	174	mm_log((1, "(%p) <- i_img_16_new\n", im));
	175
	176	return im;
	177	}
	178
	179	static int i_ppix_d16(i_img im, int x, int y, i_color val) {
	180	int off, ch;
	181
	182	if (x < 0 \|\| x >= im->xsize \|\| y < 0 \|\| y > im->ysize)
	183	return -1;
	184
	185	off = (x + y * im->xsize) * im->channels;
	186	for (ch = 0; ch < im->channels; ++ch)
	187	STORE8as16(im->idata, off+ch, val->channel[ch]);
	188
	189	return 0;
	190	}
	191
	192	static int i_gpix_d16(i_img im, int x, int y, i_color val) {
	193	int off, ch;
	194
	195	if (x < 0 \|\| x >= im->xsize \|\| y < 0 \|\| y > im->ysize)
	196	return -1;
	197
	198	off = (x + y * im->xsize) * im->channels;
	199	for (ch = 0; ch < im->channels; ++ch)
	200	val->channel[ch] = GET16as8(im->idata, off+ch);
	201
	202	return 0;
	203	}
204
205	static int i_ppixf_d16(i_img im, int x, int y, i_fcolor val) {
206	int off, ch;
207
208	if (x < 0 \|\| x >= im->xsize \|\| y < 0 \|\| y > im->ysize)
209	return -1;
210
211	off = (x + y * im->xsize) * im->channels;
212	for (ch = 0; ch < im->channels; ++ch)
213	STORE16(im->idata, off+ch, SampleFTo16(val->channel[ch]));
214
215	return 0;
216	}
217
218	static int i_gpixf_d16(i_img im, int x, int y, i_fcolor val) {
219	int off, ch;
220
221	if (x < 0 \|\| x >= im->xsize \|\| y < 0 \|\| y > im->ysize)
222	return -1;
223
224	off = (x + y * im->xsize) * im->channels;
225	for (ch = 0; ch < im->channels; ++ch)
226	val->channel[ch] = Sample16ToF(GET16(im->idata, off+ch));
227
228	return 0;
229	}
230
231	static int i_glin_d16(i_img im, int l, int r, int y, i_color vals) {
232	int ch, count, i;
233	int off;
234	if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
235	if (r > im->xsize)
236	r = im->xsize;
237	off = (l+yim->xsize) im->channels;
238	count = r - l;
239	for (i = 0; i < count; ++i) {
240	for (ch = 0; ch < im->channels; ++ch) {
241	vals[i].channel[ch] = GET16as8(im->idata, off);
242	++off;
243	}
244	}
245	return count;
246	}
247	else {
248	return 0;
249	}
250	}
251
252	static int i_plin_d16(i_img im, int l, int r, int y, i_color vals) {
253	int ch, count, i;
254	int off;
255	if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
256	if (r > im->xsize)
257	r = im->xsize;
258	off = (l+yim->xsize) im->channels;
259	count = r - l;
260	for (i = 0; i < count; ++i) {
261	for (ch = 0; ch < im->channels; ++ch) {
262	STORE8as16(im->idata, off, vals[i].channel[ch]);
263	++off;
264	}
265	}
266	return count;
267	}
268	else {
269	return 0;
270	}
271	}
272
273	static int i_glinf_d16(i_img im, int l, int r, int y, i_fcolor vals) {
274	int ch, count, i;
275	int off;
276	if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
277	if (r > im->xsize)
278	r = im->xsize;
279	off = (l+yim->xsize) im->channels;
280	count = r - l;
281	for (i = 0; i < count; ++i) {
282	for (ch = 0; ch < im->channels; ++ch) {
283	vals[i].channel[ch] = Sample16ToF(GET16(im->idata, off));
284	++off;
285	}
286	}
287	return count;
288	}
289	else {
290	return 0;
291	}
292	}
293
294	static int i_plinf_d16(i_img im, int l, int r, int y, i_fcolor vals) {
295	int ch, count, i;
296	int off;
297	if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
298	if (r > im->xsize)
299	r = im->xsize;
300	off = (l+yim->xsize) im->channels;
301	count = r - l;
302	for (i = 0; i < count; ++i) {
303	for (ch = 0; ch < im->channels; ++ch) {
304	STORE16(im->idata, off, SampleFTo16(vals[i].channel[ch]));
305	++off;
306	}
307	}
308	return count;
309	}
310	else {
311	return 0;
312	}
313	}
314
315	static int i_gsamp_d16(i_img im, int l, int r, int y, i_sample_t samps,
316	int *chans, int chan_count) {
317	int ch, count, i, w;
318	int off;
319
320	if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
321	if (r > im->xsize)
322	r = im->xsize;
323	off = (l+yim->xsize) im->channels;
324	w = r - l;
325	count = 0;
326
327	if (chans) {
328	/* make sure we have good channel numbers */
329	for (ch = 0; ch < chan_count; ++ch) {
330	if (chans[ch] < 0 \|\| chans[ch] >= im->channels) {
331	i_push_errorf(0, "No channel %d in this image", chans[ch]);
332	return 0;
333	}
334	}
335	for (i = 0; i < w; ++i) {
336	for (ch = 0; ch < chan_count; ++ch) {
337	*samps++ = GET16as8(im->idata, off+chans[ch]);
338	++count;
339	}
340	off += im->channels;
341	}
342	}
343	else {
344	for (i = 0; i < w; ++i) {
345	for (ch = 0; ch < chan_count; ++ch) {
346	*samps++ = GET16as8(im->idata, off+ch);
347	++count;
348	}
349	off += im->channels;
350	}
351	}
352
353	return count;
354	}
355	else {
356	return 0;
357	}
358	}
359
360	static int i_gsampf_d16(i_img im, int l, int r, int y, i_fsample_t samps,
361	int *chans, int chan_count) {
362	int ch, count, i, w;
363	int off;
364
365	if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
366	if (r > im->xsize)
367	r = im->xsize;
368	off = (l+yim->xsize) im->channels;
369	w = r - l;
370	count = 0;
371
372	if (chans) {
373	/* make sure we have good channel numbers */
374	for (ch = 0; ch < chan_count; ++ch) {
375	if (chans[ch] < 0 \|\| chans[ch] >= im->channels) {
376	i_push_errorf(0, "No channel %d in this image", chans[ch]);
377	return 0;
378	}
379	}
380	for (i = 0; i < w; ++i) {
381	for (ch = 0; ch < chan_count; ++ch) {
382	*samps++ = Sample16ToF(GET16(im->idata, off+chans[ch]));
383	++count;
384	}
385	off += im->channels;
386	}
387	}
388	else {
389	for (i = 0; i < w; ++i) {
390	for (ch = 0; ch < chan_count; ++ch) {
391	*samps++ = Sample16ToF(GET16(im->idata, off+ch));
392	++count;
393	}
394	off += im->channels;
395	}
396	}
397
398	return count;
399	}
400	else {
401	return 0;
402	}
403	}
404
b8c2033e AMH	405	/*
	406	=back
	407
	408	=head1 AUTHOR
	409
	410	Tony Cook <tony@develop-help.com>
	411
	412	=head1 SEE ALSO
	413
	414	Imager(3)
	415
	416	=cut
	417	*/