chromium/third_party/libjpeg_turbo/jccolext.c

/*
 * 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, 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_internal(j_compress_ptr cinfo, JSAMPARRAY input_buf,
                         JSAMPIMAGE output_buf, JDIMENSION output_row,
                         int num_rows)
{ … }


/**************** 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_internal(j_compress_ptr cinfo, JSAMPARRAY input_buf,
                          JSAMPIMAGE output_buf, JDIMENSION output_row,
                          int num_rows)
{ … }


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

INLINE
LOCAL(void)
rgb_rgb_convert_internal(j_compress_ptr cinfo, JSAMPARRAY input_buf,
                         JSAMPIMAGE output_buf, JDIMENSION output_row,
                         int num_rows)
{ … }