chromium/third_party/libjpeg_turbo/jdpostct.c

/*
 * jdpostct.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1994-1996, Thomas G. Lane.
 * It was modified by The libjpeg-turbo Project to include only code relevant
 * to libjpeg-turbo.
 * For conditions of distribution and use, see the accompanying README.ijg
 * file.
 *
 * This file contains the decompression postprocessing controller.
 * This controller manages the upsampling, color conversion, and color
 * quantization/reduction steps; specifically, it controls the buffering
 * between upsample/color conversion and color quantization/reduction.
 *
 * If no color quantization/reduction is required, then this module has no
 * work to do, and it just hands off to the upsample/color conversion code.
 * An integrated upsample/convert/quantize process would replace this module
 * entirely.
 */

#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"


/* Private buffer controller object */

my_post_controller;

my_post_ptr;


/* Forward declarations */
METHODDEF(void) post_process_1pass(j_decompress_ptr cinfo,
                                   JSAMPIMAGE input_buf,
                                   JDIMENSION *in_row_group_ctr,
                                   JDIMENSION in_row_groups_avail,
                                   JSAMPARRAY output_buf,
                                   JDIMENSION *out_row_ctr,
                                   JDIMENSION out_rows_avail);
#ifdef QUANT_2PASS_SUPPORTED
METHODDEF(void) post_process_prepass(j_decompress_ptr cinfo,
                                     JSAMPIMAGE input_buf,
                                     JDIMENSION *in_row_group_ctr,
                                     JDIMENSION in_row_groups_avail,
                                     JSAMPARRAY output_buf,
                                     JDIMENSION *out_row_ctr,
                                     JDIMENSION out_rows_avail);
METHODDEF(void) post_process_2pass(j_decompress_ptr cinfo,
                                   JSAMPIMAGE input_buf,
                                   JDIMENSION *in_row_group_ctr,
                                   JDIMENSION in_row_groups_avail,
                                   JSAMPARRAY output_buf,
                                   JDIMENSION *out_row_ctr,
                                   JDIMENSION out_rows_avail);
#endif


/*
 * Initialize for a processing pass.
 */

METHODDEF(void)
start_pass_dpost(j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
{ … }


/*
 * Process some data in the one-pass (strip buffer) case.
 * This is used for color precision reduction as well as one-pass quantization.
 */

METHODDEF(void)
post_process_1pass(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
                   JDIMENSION *in_row_group_ctr,
                   JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
                   JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
{ … }


#ifdef QUANT_2PASS_SUPPORTED

/*
 * Process some data in the first pass of 2-pass quantization.
 */

METHODDEF(void)
post_process_prepass(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
                     JDIMENSION *in_row_group_ctr,
                     JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
                     JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
{ … }


/*
 * Process some data in the second pass of 2-pass quantization.
 */

METHODDEF(void)
post_process_2pass(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
                   JDIMENSION *in_row_group_ctr,
                   JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
                   JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
{ … }

#endif /* QUANT_2PASS_SUPPORTED */


/*
 * Initialize postprocessing controller.
 */

GLOBAL(void)
jinit_d_post_controller(j_decompress_ptr cinfo, boolean need_full_buffer)
{ … }