/src/libjpeg-turbo.dev/src/jdcolext.c

Source
/*
 * jdcolext.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1991-1997, Thomas G. Lane.
 * libjpeg-turbo Modifications:
 * Copyright (C) 2009, 2011, 2015, 2022-2023, 2025, D. R. Commander.
 * For conditions of distribution and use, see the accompanying README.ijg
 * file.
 *
 * This file contains output colorspace conversion routines.
 */


/* This file is included by jdcolor.c */


/*
 * Convert some rows of samples to the output colorspace.
 *
 * Note that we change from noninterleaved, one-plane-per-component format
 * to interleaved-pixel format.  The output buffer is therefore three times
 * as wide as the input buffer.
 * A starting row offset is provided only for the input buffer.  The caller
 * can easily adjust the passed output_buf value to accommodate any row
 * offset required on that side.
 */

INLINE
LOCAL(void)
ycc_rgb_convert(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                JDIMENSION input_row, _JSAMPARRAY output_buf, int num_rows)
{
#if BITS_IN_JSAMPLE != 16
  my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
  register int y, cb, cr;
  register _JSAMPROW outptr;
  register _JSAMPROW inptr0, inptr1, inptr2;
  register JDIMENSION col;
  JDIMENSION num_cols = cinfo->output_width;
  /* copy these pointers into registers if possible */
  register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit;
  register int *Crrtab = cconvert->Cr_r_tab;
  register int *Cbbtab = cconvert->Cb_b_tab;
  register JLONG *Crgtab = cconvert->Cr_g_tab;
  register JLONG *Cbgtab = cconvert->Cb_g_tab;
  SHIFT_TEMPS

  while (--num_rows >= 0) {
    inptr0 = input_buf[0][input_row];
    inptr1 = input_buf[1][input_row];
    inptr2 = input_buf[2][input_row];
    input_row++;
    outptr = *output_buf++;
    for (col = 0; col < num_cols; col++) {
      y  = inptr0[col];
      cb = inptr1[col];
      cr = inptr2[col];
      /* Range-limiting is essential due to noise introduced by DCT losses. */
      outptr[RGB_RED] =   range_limit[y + Crrtab[cr]];
      outptr[RGB_GREEN] = range_limit[y +
                              ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                                SCALEBITS))];
      outptr[RGB_BLUE] =  range_limit[y + Cbbtab[cb]];
      /* Set unused byte to _MAXJSAMPLE so it can be interpreted as an */
      /* opaque alpha channel value */
#ifdef RGB_ALPHA
      outptr[RGB_ALPHA] = _MAXJSAMPLE;
#endif
      outptr += RGB_PIXELSIZE;
    }
  }
#else
  ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
#endif
}


/*
 * Convert grayscale to RGB: just duplicate the graylevel three times.
 * This is provided to support applications that don't want to cope
 * with grayscale as a separate case.
 */

INLINE
LOCAL(void)
gray_rgb_convert(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                 JDIMENSION input_row, _JSAMPARRAY output_buf, int num_rows)
{
  register _JSAMPROW inptr, outptr;
  register JDIMENSION col;
  JDIMENSION num_cols = cinfo->output_width;

  while (--num_rows >= 0) {
    inptr = input_buf[0][input_row++];
    outptr = *output_buf++;
    for (col = 0; col < num_cols; col++) {
      outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
      /* Set unused byte to _MAXJSAMPLE so it can be interpreted as an */
      /* opaque alpha channel value */
#ifdef RGB_ALPHA
      outptr[RGB_ALPHA] = _MAXJSAMPLE;
#endif
      outptr += RGB_PIXELSIZE;
    }
  }
}


/*
 * Convert RGB to extended RGB: just swap the order of source pixels
 */

INLINE
LOCAL(void)
rgb_rgb_convert(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                JDIMENSION input_row, _JSAMPARRAY output_buf, int num_rows)
{
  register _JSAMPROW inptr0, inptr1, inptr2;
  register _JSAMPROW outptr;
  register JDIMENSION col;
  JDIMENSION num_cols = cinfo->output_width;

  while (--num_rows >= 0) {
    inptr0 = input_buf[0][input_row];
    inptr1 = input_buf[1][input_row];
    inptr2 = input_buf[2][input_row];
    input_row++;
    outptr = *output_buf++;
    for (col = 0; col < num_cols; col++) {
      outptr[RGB_RED] = inptr0[col];
      outptr[RGB_GREEN] = inptr1[col];
      outptr[RGB_BLUE] = inptr2[col];
      /* Set unused byte to _MAXJSAMPLE so it can be interpreted as an */
      /* opaque alpha channel value */
#ifdef RGB_ALPHA
      outptr[RGB_ALPHA] = _MAXJSAMPLE;
#endif
      outptr += RGB_PIXELSIZE;
    }
  }
}

Line	Count	Source
1		/*
2		* jdcolext.c
3		*
4		* This file was part of the Independent JPEG Group's software:
5		* Copyright (C) 1991-1997, Thomas G. Lane.
6		* libjpeg-turbo Modifications:
7		* Copyright (C) 2009, 2011, 2015, 2022-2023, 2025, D. R. Commander.
8		* For conditions of distribution and use, see the accompanying README.ijg
9		* file.
10		*
11		* This file contains output colorspace conversion routines.
12		*/
13
14
15		/* This file is included by jdcolor.c */
16
17
18		/*
19		* Convert some rows of samples to the output colorspace.
20		*
21		* Note that we change from noninterleaved, one-plane-per-component format
22		* to interleaved-pixel format. The output buffer is therefore three times
23		* as wide as the input buffer.
24		* A starting row offset is provided only for the input buffer. The caller
25		* can easily adjust the passed output_buf value to accommodate any row
26		* offset required on that side.
27		*/
28
29		INLINE
30		LOCAL(void)
31		ycc_rgb_convert(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
32		JDIMENSION input_row, _JSAMPARRAY output_buf, int num_rows)
33	0	{
34		#if BITS_IN_JSAMPLE != 16
35		my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
36		register int y, cb, cr;
37		register _JSAMPROW outptr;
38		register _JSAMPROW inptr0, inptr1, inptr2;
39		register JDIMENSION col;
40		JDIMENSION num_cols = cinfo->output_width;
41		/* copy these pointers into registers if possible */
42		register _JSAMPLE range_limit = (_JSAMPLE )cinfo->sample_range_limit;
43		register int *Crrtab = cconvert->Cr_r_tab;
44		register int *Cbbtab = cconvert->Cb_b_tab;
45		register JLONG *Crgtab = cconvert->Cr_g_tab;
46		register JLONG *Cbgtab = cconvert->Cb_g_tab;
47		SHIFT_TEMPS
48
49	0	while (--num_rows >= 0) {
50	0	inptr0 = input_buf[0][input_row];
51	0	inptr1 = input_buf[1][input_row];
52	0	inptr2 = input_buf[2][input_row];
53	0	input_row++;
54	0	outptr = *output_buf++;
55	0	for (col = 0; col < num_cols; col++) {
56	0	y = inptr0[col];
57	0	cb = inptr1[col];
58	0	cr = inptr2[col];
59		/* Range-limiting is essential due to noise introduced by DCT losses. */
60	0	outptr[RGB_RED] = range_limit[y + Crrtab[cr]];
61	0	outptr[RGB_GREEN] = range_limit[y +
62	0	((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
63	0	SCALEBITS))];
64	0	outptr[RGB_BLUE] = range_limit[y + Cbbtab[cb]];
65		/* Set unused byte to _MAXJSAMPLE so it can be interpreted as an */
66		/* opaque alpha channel value */
67		#ifdef RGB_ALPHA
68	0	outptr[RGB_ALPHA] = _MAXJSAMPLE;
69		#endif
70	0	outptr += RGB_PIXELSIZE;
71	0	}
72	0	}
73		#else
74	0	ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
75		#endif
76	0	} Unexecuted instantiation: jdcolor-8.c:ycc_extrgb_convert Unexecuted instantiation: jdcolor-8.c:ycc_extrgbx_convert Unexecuted instantiation: jdcolor-8.c:ycc_extbgr_convert Unexecuted instantiation: jdcolor-8.c:ycc_extbgrx_convert Unexecuted instantiation: jdcolor-8.c:ycc_extxbgr_convert Unexecuted instantiation: jdcolor-8.c:ycc_extxrgb_convert Unexecuted instantiation: jdcolor-8.c:ycc_rgb_convert Unexecuted instantiation: jdcolor-12.c:ycc_extrgb_convert Unexecuted instantiation: jdcolor-12.c:ycc_extrgbx_convert Unexecuted instantiation: jdcolor-12.c:ycc_extbgr_convert Unexecuted instantiation: jdcolor-12.c:ycc_extbgrx_convert Unexecuted instantiation: jdcolor-12.c:ycc_extxbgr_convert Unexecuted instantiation: jdcolor-12.c:ycc_extxrgb_convert Unexecuted instantiation: jdcolor-12.c:ycc_rgb_convert Unexecuted instantiation: jdcolor-16.c:ycc_extrgb_convert Unexecuted instantiation: jdcolor-16.c:ycc_extrgbx_convert Unexecuted instantiation: jdcolor-16.c:ycc_extbgr_convert Unexecuted instantiation: jdcolor-16.c:ycc_extbgrx_convert Unexecuted instantiation: jdcolor-16.c:ycc_extxbgr_convert Unexecuted instantiation: jdcolor-16.c:ycc_extxrgb_convert Unexecuted instantiation: jdcolor-16.c:ycc_rgb_convert
77
78
79		/*
80		* Convert grayscale to RGB: just duplicate the graylevel three times.
81		* This is provided to support applications that don't want to cope
82		* with grayscale as a separate case.
83		*/
84
85		INLINE
86		LOCAL(void)
87		gray_rgb_convert(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
88		JDIMENSION input_row, _JSAMPARRAY output_buf, int num_rows)
89	0	{
90	0	register _JSAMPROW inptr, outptr;
91	0	register JDIMENSION col;
92	0	JDIMENSION num_cols = cinfo->output_width;
93
94	0	while (--num_rows >= 0) {
95	0	inptr = input_buf[0][input_row++];
96	0	outptr = *output_buf++;
97	0	for (col = 0; col < num_cols; col++) {
98	0	outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
99		/* Set unused byte to _MAXJSAMPLE so it can be interpreted as an */
100		/* opaque alpha channel value */
101		#ifdef RGB_ALPHA
102	0	outptr[RGB_ALPHA] = _MAXJSAMPLE;
103		#endif
104	0	outptr += RGB_PIXELSIZE;
105	0	}
106	0	}
107	0	} Unexecuted instantiation: jdcolor-8.c:gray_extrgb_convert Unexecuted instantiation: jdcolor-8.c:gray_extrgbx_convert Unexecuted instantiation: jdcolor-8.c:gray_extbgr_convert Unexecuted instantiation: jdcolor-8.c:gray_extbgrx_convert Unexecuted instantiation: jdcolor-8.c:gray_extxbgr_convert Unexecuted instantiation: jdcolor-8.c:gray_extxrgb_convert Unexecuted instantiation: jdcolor-8.c:gray_rgb_convert Unexecuted instantiation: jdcolor-12.c:gray_extrgb_convert Unexecuted instantiation: jdcolor-12.c:gray_extrgbx_convert Unexecuted instantiation: jdcolor-12.c:gray_extbgr_convert Unexecuted instantiation: jdcolor-12.c:gray_extbgrx_convert Unexecuted instantiation: jdcolor-12.c:gray_extxbgr_convert Unexecuted instantiation: jdcolor-12.c:gray_extxrgb_convert Unexecuted instantiation: jdcolor-12.c:gray_rgb_convert Unexecuted instantiation: jdcolor-16.c:gray_extrgb_convert Unexecuted instantiation: jdcolor-16.c:gray_extrgbx_convert Unexecuted instantiation: jdcolor-16.c:gray_extbgr_convert Unexecuted instantiation: jdcolor-16.c:gray_extbgrx_convert Unexecuted instantiation: jdcolor-16.c:gray_extxbgr_convert Unexecuted instantiation: jdcolor-16.c:gray_extxrgb_convert Unexecuted instantiation: jdcolor-16.c:gray_rgb_convert
108
109
110		/*
111		* Convert RGB to extended RGB: just swap the order of source pixels
112		*/
113
114		INLINE
115		LOCAL(void)
116		rgb_rgb_convert(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
117		JDIMENSION input_row, _JSAMPARRAY output_buf, int num_rows)
118	0	{
119	0	register _JSAMPROW inptr0, inptr1, inptr2;
120	0	register _JSAMPROW outptr;
121	0	register JDIMENSION col;
122	0	JDIMENSION num_cols = cinfo->output_width;
123
124	0	while (--num_rows >= 0) {
125	0	inptr0 = input_buf[0][input_row];
126	0	inptr1 = input_buf[1][input_row];
127	0	inptr2 = input_buf[2][input_row];
128	0	input_row++;
129	0	outptr = *output_buf++;
130	0	for (col = 0; col < num_cols; col++) {
131	0	outptr[RGB_RED] = inptr0[col];
132	0	outptr[RGB_GREEN] = inptr1[col];
133	0	outptr[RGB_BLUE] = inptr2[col];
134		/* Set unused byte to _MAXJSAMPLE so it can be interpreted as an */
135		/* opaque alpha channel value */
136		#ifdef RGB_ALPHA
137	0	outptr[RGB_ALPHA] = _MAXJSAMPLE;
138		#endif
139	0	outptr += RGB_PIXELSIZE;
140	0	}
141	0	}
142	0	} Unexecuted instantiation: jdcolor-8.c:rgb_extrgb_convert Unexecuted instantiation: jdcolor-8.c:rgb_extrgbx_convert Unexecuted instantiation: jdcolor-8.c:rgb_extbgr_convert Unexecuted instantiation: jdcolor-8.c:rgb_extbgrx_convert Unexecuted instantiation: jdcolor-8.c:rgb_extxbgr_convert Unexecuted instantiation: jdcolor-8.c:rgb_extxrgb_convert Unexecuted instantiation: jdcolor-8.c:rgb_rgb_convert Unexecuted instantiation: jdcolor-12.c:rgb_extrgb_convert Unexecuted instantiation: jdcolor-12.c:rgb_extrgbx_convert Unexecuted instantiation: jdcolor-12.c:rgb_extbgr_convert Unexecuted instantiation: jdcolor-12.c:rgb_extbgrx_convert Unexecuted instantiation: jdcolor-12.c:rgb_extxbgr_convert Unexecuted instantiation: jdcolor-12.c:rgb_extxrgb_convert Unexecuted instantiation: jdcolor-12.c:rgb_rgb_convert Unexecuted instantiation: jdcolor-16.c:rgb_extrgb_convert Unexecuted instantiation: jdcolor-16.c:rgb_extrgbx_convert Unexecuted instantiation: jdcolor-16.c:rgb_extbgr_convert Unexecuted instantiation: jdcolor-16.c:rgb_extbgrx_convert Unexecuted instantiation: jdcolor-16.c:rgb_extxbgr_convert Unexecuted instantiation: jdcolor-16.c:rgb_extxrgb_convert Unexecuted instantiation: jdcolor-16.c:rgb_rgb_convert

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Created: 2025-10-13 06:04