/*
 * 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, 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_internal (j_decompress_ptr
cinfo,
JSAMPIMAGE input_buf, JDIMENSION
input_row,
JSAMPARRAY output_buf,
int num_rows
)
{
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 = 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 = GETJSAMPLE(inptr0[col]);
cb = GETJSAMPLE(inptr1[col]);
cr = GETJSAMPLE(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 0xFF so it can be interpreted as an opaque */
/* alpha channel value */
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
#endif
outptr +=
RGB_PIXELSIZE;
}
}
}


/*
 * 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_internal (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++) {
/* We can dispense with GETJSAMPLE() here */
outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
/* Set unused byte to 0xFF so it can be interpreted as an opaque */
/* alpha channel value */
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
#endif
outptr +=
RGB_PIXELSIZE;
}
}
}


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

INLINE
LOCAL(void)

rgb_rgb_convert_internal (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++) {
/* We can dispense with GETJSAMPLE() here */
outptr[RGB_RED] = inptr0[col];
outptr[RGB_GREEN] = inptr1[col];
outptr[RGB_BLUE] = inptr2[col];
/* Set unused byte to 0xFF so it can be interpreted as an opaque */
/* alpha channel value */
#ifdef RGB_ALPHA
outptr[RGB_ALPHA] = 0xFF;
#endif
outptr +=
RGB_PIXELSIZE;
}
}
}
