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

Source
/*
 * jccolext.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1991-1996, Thomas G. Lane.
 * libjpeg-turbo Modifications:
 * Copyright (C) 2009-2012, 2015, 2022, 2025, D. R. Commander.
 * For conditions of distribution and use, see the accompanying README.ijg
 * file.
 *
 * This file contains input colorspace conversion routines.
 */


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


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

INLINE
LOCAL(void)
rgb_ycc_convert(j_compress_ptr cinfo, _JSAMPARRAY input_buf,
                _JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
{
#if BITS_IN_JSAMPLE != 16
  my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
  register int r, g, b;
  register JLONG *ctab = cconvert->rgb_ycc_tab;
  register _JSAMPROW inptr;
  register _JSAMPROW outptr0, outptr1, outptr2;
  register JDIMENSION col;
  JDIMENSION num_cols = cinfo->image_width;

  while (--num_rows >= 0) {
    inptr = *input_buf++;
    outptr0 = output_buf[0][output_row];
    outptr1 = output_buf[1][output_row];
    outptr2 = output_buf[2][output_row];
    output_row++;
    for (col = 0; col < num_cols; col++) {
      r = RANGE_LIMIT(inptr[RGB_RED]);
      g = RANGE_LIMIT(inptr[RGB_GREEN]);
      b = RANGE_LIMIT(inptr[RGB_BLUE]);
      inptr += RGB_PIXELSIZE;
      /* If the inputs are 0.._MAXJSAMPLE, the outputs of these equations
       * must be too; we do not need an explicit range-limiting operation.
       * Hence the value being shifted is never negative, and we don't
       * need the general RIGHT_SHIFT macro.
       */
      /* Y */
      outptr0[col] = (_JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
                                 ctab[b + B_Y_OFF]) >> SCALEBITS);
      /* Cb */
      outptr1[col] = (_JSAMPLE)((ctab[r + R_CB_OFF] + ctab[g + G_CB_OFF] +
                                 ctab[b + B_CB_OFF]) >> SCALEBITS);
      /* Cr */
      outptr2[col] = (_JSAMPLE)((ctab[r + R_CR_OFF] + ctab[g + G_CR_OFF] +
                                 ctab[b + B_CR_OFF]) >> SCALEBITS);
    }
  }
#else
  ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
#endif
}


/**************** Cases other than RGB -> YCbCr **************/


/*
 * Convert some rows of samples to the JPEG colorspace.
 * This version handles RGB->grayscale conversion, which is the same
 * as the RGB->Y portion of RGB->YCbCr.
 * We assume rgb_ycc_start has been called (we only use the Y tables).
 */

INLINE
LOCAL(void)
rgb_gray_convert(j_compress_ptr cinfo, _JSAMPARRAY input_buf,
                 _JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
{
#if BITS_IN_JSAMPLE != 16
  my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
  register int r, g, b;
  register JLONG *ctab = cconvert->rgb_ycc_tab;
  register _JSAMPROW inptr;
  register _JSAMPROW outptr;
  register JDIMENSION col;
  JDIMENSION num_cols = cinfo->image_width;

  while (--num_rows >= 0) {
    inptr = *input_buf++;
    outptr = output_buf[0][output_row];
    output_row++;
    for (col = 0; col < num_cols; col++) {
      r = RANGE_LIMIT(inptr[RGB_RED]);
      g = RANGE_LIMIT(inptr[RGB_GREEN]);
      b = RANGE_LIMIT(inptr[RGB_BLUE]);
      inptr += RGB_PIXELSIZE;
      /* Y */
      outptr[col] = (_JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
                                ctab[b + B_Y_OFF]) >> SCALEBITS);
    }
  }
#else
  ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
#endif
}


/*
 * Convert some rows of samples to the JPEG colorspace.
 * This version handles extended RGB->plain RGB conversion
 */

INLINE
LOCAL(void)
rgb_rgb_convert(j_compress_ptr cinfo, _JSAMPARRAY input_buf,
                _JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
{
  register _JSAMPROW inptr;
  register _JSAMPROW outptr0, outptr1, outptr2;
  register JDIMENSION col;
  JDIMENSION num_cols = cinfo->image_width;

  while (--num_rows >= 0) {
    inptr = *input_buf++;
    outptr0 = output_buf[0][output_row];
    outptr1 = output_buf[1][output_row];
    outptr2 = output_buf[2][output_row];
    output_row++;
    for (col = 0; col < num_cols; col++) {
      outptr0[col] = inptr[RGB_RED];
      outptr1[col] = inptr[RGB_GREEN];
      outptr2[col] = inptr[RGB_BLUE];
      inptr += RGB_PIXELSIZE;
    }
  }
}

Line	Count	Source
1		/*
2		* jccolext.c
3		*
4		* This file was part of the Independent JPEG Group's software:
5		* Copyright (C) 1991-1996, Thomas G. Lane.
6		* libjpeg-turbo Modifications:
7		* Copyright (C) 2009-2012, 2015, 2022, 2025, D. R. Commander.
8		* For conditions of distribution and use, see the accompanying README.ijg
9		* file.
10		*
11		* This file contains input colorspace conversion routines.
12		*/
13
14
15		/* This file is included by jccolor.c */
16
17
18		/*
19		* Convert some rows of samples to the JPEG colorspace.
20		*
21		* Note that we change from the application's interleaved-pixel format
22		* to our internal noninterleaved, one-plane-per-component format.
23		* The input buffer is therefore three times as wide as the output buffer.
24		*
25		* A starting row offset is provided only for the output buffer. The caller
26		* can easily adjust the passed input_buf value to accommodate any row
27		* offset required on that side.
28		*/
29
30		INLINE
31		LOCAL(void)
32		rgb_ycc_convert(j_compress_ptr cinfo, _JSAMPARRAY input_buf,
33		_JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
34	0	{
35		#if BITS_IN_JSAMPLE != 16
36		my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
37		register int r, g, b;
38		register JLONG *ctab = cconvert->rgb_ycc_tab;
39		register _JSAMPROW inptr;
40		register _JSAMPROW outptr0, outptr1, outptr2;
41		register JDIMENSION col;
42		JDIMENSION num_cols = cinfo->image_width;
43
44	0	while (--num_rows >= 0) {
45	0	inptr = *input_buf++;
46	0	outptr0 = output_buf[0][output_row];
47	0	outptr1 = output_buf[1][output_row];
48	0	outptr2 = output_buf[2][output_row];
49	0	output_row++;
50	0	for (col = 0; col < num_cols; col++) {
51	0	r = RANGE_LIMIT(inptr[RGB_RED]);
52	0	g = RANGE_LIMIT(inptr[RGB_GREEN]);
53	0	b = RANGE_LIMIT(inptr[RGB_BLUE]);
54	0	inptr += RGB_PIXELSIZE;
55		/* If the inputs are 0.._MAXJSAMPLE, the outputs of these equations
56		* must be too; we do not need an explicit range-limiting operation.
57		* Hence the value being shifted is never negative, and we don't
58		* need the general RIGHT_SHIFT macro.
59		*/
60		/* Y */
61	0	outptr0[col] = (_JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
62	0	ctab[b + B_Y_OFF]) >> SCALEBITS);
63		/* Cb */
64	0	outptr1[col] = (_JSAMPLE)((ctab[r + R_CB_OFF] + ctab[g + G_CB_OFF] +
65	0	ctab[b + B_CB_OFF]) >> SCALEBITS);
66		/* Cr */
67	0	outptr2[col] = (_JSAMPLE)((ctab[r + R_CR_OFF] + ctab[g + G_CR_OFF] +
68	0	ctab[b + B_CR_OFF]) >> SCALEBITS);
69	0	}
70	0	}
71		#else
72	0	ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
73		#endif
74	0	} Unexecuted instantiation: jccolor-8.c:extrgb_ycc_convert Unexecuted instantiation: jccolor-8.c:extrgbx_ycc_convert Unexecuted instantiation: jccolor-8.c:extbgr_ycc_convert Unexecuted instantiation: jccolor-8.c:extbgrx_ycc_convert Unexecuted instantiation: jccolor-8.c:extxbgr_ycc_convert Unexecuted instantiation: jccolor-8.c:extxrgb_ycc_convert Unexecuted instantiation: jccolor-8.c:rgb_ycc_convert Unexecuted instantiation: jccolor-12.c:extrgb_ycc_convert Unexecuted instantiation: jccolor-12.c:extrgbx_ycc_convert Unexecuted instantiation: jccolor-12.c:extbgr_ycc_convert Unexecuted instantiation: jccolor-12.c:extbgrx_ycc_convert Unexecuted instantiation: jccolor-12.c:extxbgr_ycc_convert Unexecuted instantiation: jccolor-12.c:extxrgb_ycc_convert Unexecuted instantiation: jccolor-12.c:rgb_ycc_convert Unexecuted instantiation: jccolor-16.c:extrgb_ycc_convert Unexecuted instantiation: jccolor-16.c:extrgbx_ycc_convert Unexecuted instantiation: jccolor-16.c:extbgr_ycc_convert Unexecuted instantiation: jccolor-16.c:extbgrx_ycc_convert Unexecuted instantiation: jccolor-16.c:extxbgr_ycc_convert Unexecuted instantiation: jccolor-16.c:extxrgb_ycc_convert Unexecuted instantiation: jccolor-16.c:rgb_ycc_convert
75
76
77		/************** Cases other than RGB -> YCbCr ************/
78
79
80		/*
81		* Convert some rows of samples to the JPEG colorspace.
82		* This version handles RGB->grayscale conversion, which is the same
83		* as the RGB->Y portion of RGB->YCbCr.
84		* We assume rgb_ycc_start has been called (we only use the Y tables).
85		*/
86
87		INLINE
88		LOCAL(void)
89		rgb_gray_convert(j_compress_ptr cinfo, _JSAMPARRAY input_buf,
90		_JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
91	0	{
92		#if BITS_IN_JSAMPLE != 16
93		my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
94		register int r, g, b;
95		register JLONG *ctab = cconvert->rgb_ycc_tab;
96		register _JSAMPROW inptr;
97		register _JSAMPROW outptr;
98		register JDIMENSION col;
99		JDIMENSION num_cols = cinfo->image_width;
100
101	0	while (--num_rows >= 0) {
102	0	inptr = *input_buf++;
103	0	outptr = output_buf[0][output_row];
104	0	output_row++;
105	0	for (col = 0; col < num_cols; col++) {
106	0	r = RANGE_LIMIT(inptr[RGB_RED]);
107	0	g = RANGE_LIMIT(inptr[RGB_GREEN]);
108	0	b = RANGE_LIMIT(inptr[RGB_BLUE]);
109	0	inptr += RGB_PIXELSIZE;
110		/* Y */
111	0	outptr[col] = (_JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
112	0	ctab[b + B_Y_OFF]) >> SCALEBITS);
113	0	}
114	0	}
115		#else
116	0	ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
117		#endif
118	0	} Unexecuted instantiation: jccolor-8.c:extrgb_gray_convert Unexecuted instantiation: jccolor-8.c:extrgbx_gray_convert Unexecuted instantiation: jccolor-8.c:extbgr_gray_convert Unexecuted instantiation: jccolor-8.c:extbgrx_gray_convert Unexecuted instantiation: jccolor-8.c:extxbgr_gray_convert Unexecuted instantiation: jccolor-8.c:extxrgb_gray_convert Unexecuted instantiation: jccolor-8.c:rgb_gray_convert Unexecuted instantiation: jccolor-12.c:extrgb_gray_convert Unexecuted instantiation: jccolor-12.c:extrgbx_gray_convert Unexecuted instantiation: jccolor-12.c:extbgr_gray_convert Unexecuted instantiation: jccolor-12.c:extbgrx_gray_convert Unexecuted instantiation: jccolor-12.c:extxbgr_gray_convert Unexecuted instantiation: jccolor-12.c:extxrgb_gray_convert Unexecuted instantiation: jccolor-12.c:rgb_gray_convert Unexecuted instantiation: jccolor-16.c:extrgb_gray_convert Unexecuted instantiation: jccolor-16.c:extrgbx_gray_convert Unexecuted instantiation: jccolor-16.c:extbgr_gray_convert Unexecuted instantiation: jccolor-16.c:extbgrx_gray_convert Unexecuted instantiation: jccolor-16.c:extxbgr_gray_convert Unexecuted instantiation: jccolor-16.c:extxrgb_gray_convert Unexecuted instantiation: jccolor-16.c:rgb_gray_convert
119
120
121		/*
122		* Convert some rows of samples to the JPEG colorspace.
123		* This version handles extended RGB->plain RGB conversion
124		*/
125
126		INLINE
127		LOCAL(void)
128		rgb_rgb_convert(j_compress_ptr cinfo, _JSAMPARRAY input_buf,
129		_JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
130	0	{
131	0	register _JSAMPROW inptr;
132	0	register _JSAMPROW outptr0, outptr1, outptr2;
133	0	register JDIMENSION col;
134	0	JDIMENSION num_cols = cinfo->image_width;
135
136	0	while (--num_rows >= 0) {
137	0	inptr = *input_buf++;
138	0	outptr0 = output_buf[0][output_row];
139	0	outptr1 = output_buf[1][output_row];
140	0	outptr2 = output_buf[2][output_row];
141	0	output_row++;
142	0	for (col = 0; col < num_cols; col++) {
143	0	outptr0[col] = inptr[RGB_RED];
144	0	outptr1[col] = inptr[RGB_GREEN];
145	0	outptr2[col] = inptr[RGB_BLUE];
146	0	inptr += RGB_PIXELSIZE;
147	0	}
148	0	}
149	0	} Unexecuted instantiation: jccolor-8.c:extrgb_rgb_convert Unexecuted instantiation: jccolor-8.c:extrgbx_rgb_convert Unexecuted instantiation: jccolor-8.c:extbgr_rgb_convert Unexecuted instantiation: jccolor-8.c:extbgrx_rgb_convert Unexecuted instantiation: jccolor-8.c:extxbgr_rgb_convert Unexecuted instantiation: jccolor-8.c:extxrgb_rgb_convert Unexecuted instantiation: jccolor-8.c:rgb_rgb_convert Unexecuted instantiation: jccolor-12.c:extrgb_rgb_convert Unexecuted instantiation: jccolor-12.c:extrgbx_rgb_convert Unexecuted instantiation: jccolor-12.c:extbgr_rgb_convert Unexecuted instantiation: jccolor-12.c:extbgrx_rgb_convert Unexecuted instantiation: jccolor-12.c:extxbgr_rgb_convert Unexecuted instantiation: jccolor-12.c:extxrgb_rgb_convert Unexecuted instantiation: jccolor-12.c:rgb_rgb_convert Unexecuted instantiation: jccolor-16.c:extrgb_rgb_convert Unexecuted instantiation: jccolor-16.c:extrgbx_rgb_convert Unexecuted instantiation: jccolor-16.c:extbgr_rgb_convert Unexecuted instantiation: jccolor-16.c:extbgrx_rgb_convert Unexecuted instantiation: jccolor-16.c:extxbgr_rgb_convert Unexecuted instantiation: jccolor-16.c:extxrgb_rgb_convert Unexecuted instantiation: jccolor-16.c:rgb_rgb_convert

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Created: 2025-10-13 06:05