<html><!-- Created using the cpp_pretty_printer from the dlib C++ library.  See http://dlib.net for updates. --><head><title>dlib C++ Library - jdct.h</title></head><body bgcolor='white'><pre>
<font color='#009900'>/*
 * jdct.h
 *
 * Copyright (C) 1994-1996, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This include file contains common declarations for the forward and
 * inverse DCT modules.  These declarations are private to the DCT managers
 * (jcdctmgr.c, jddctmgr.c) and the individual DCT algorithms.
 * The individual DCT algorithms are kept in separate files to ease 
 * machine-dependent tuning (e.g., assembly coding).
 */</font>


<font color='#009900'>/*
 * A forward DCT routine is given a pointer to an input sample array and
 * a pointer to a work area of type DCTELEM[]; the DCT is to be performed
 * in-place in that buffer.  Type DCTELEM is int for 8-bit samples, INT32
 * for 12-bit samples.  (NOTE: Floating-point DCT implementations use an
 * array of type FAST_FLOAT, instead.)
 * The input data is to be fetched from the sample array starting at a
 * specified column.  (Any row offset needed will be applied to the array
 * pointer before it is passed to the FDCT code.)
 * Note that the number of samples fetched by the FDCT routine is
 * DCT_h_scaled_size * DCT_v_scaled_size.
 * The DCT outputs are returned scaled up by a factor of 8; they therefore
 * have a range of +-8K for 8-bit data, +-128K for 12-bit data.  This
 * convention improves accuracy in integer implementations and saves some
 * work in floating-point ones.
 * Quantization of the output coefficients is done by jcdctmgr.c.
 */</font>

<font color='#0000FF'>#if</font> BITS_IN_JSAMPLE <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>8</font>
<font color='#0000FF'>typedef</font> <font color='#0000FF'><u>int</u></font> DCTELEM;		<font color='#009900'>/* 16 or 32 bits is fine */</font>
<font color='#0000FF'>#else</font>
<font color='#0000FF'>typedef</font> INT32 DCTELEM;		<font color='#009900'>/* must have 32 bits */</font>
<font color='#0000FF'>#endif</font>

<font color='#0000FF'>typedef</font> <b><a name='JMETHOD'></a>JMETHOD</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font>, forward_DCT_method_ptr, <font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data,
					       JSAMPARRAY sample_data,
					       JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>typedef</font> <b><a name='JMETHOD'></a>JMETHOD</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font>, float_DCT_method_ptr, <font face='Lucida Console'>(</font>FAST_FLOAT <font color='#5555FF'>*</font> data,
					     JSAMPARRAY sample_data,
					     JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;


<font color='#009900'>/*
 * An inverse DCT routine is given a pointer to the input JBLOCK and a pointer
 * to an output sample array.  The routine must dequantize the input data as
 * well as perform the IDCT; for dequantization, it uses the multiplier table
 * pointed to by compptr-&gt;dct_table.  The output data is to be placed into the
 * sample array starting at a specified column.  (Any row offset needed will
 * be applied to the array pointer before it is passed to the IDCT code.)
 * Note that the number of samples emitted by the IDCT routine is
 * DCT_h_scaled_size * DCT_v_scaled_size.
 */</font>

<font color='#009900'>/* typedef inverse_DCT_method_ptr is declared in jpegint.h */</font>

<font color='#009900'>/*
 * Each IDCT routine has its own ideas about the best dct_table element type.
 */</font>

<font color='#0000FF'>typedef</font> MULTIPLIER ISLOW_MULT_TYPE; <font color='#009900'>/* short or int, whichever is faster */</font>
<font color='#0000FF'>#if</font> BITS_IN_JSAMPLE <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>8</font>
<font color='#0000FF'>typedef</font> MULTIPLIER IFAST_MULT_TYPE; <font color='#009900'>/* 16 bits is OK, use short if faster */</font>
<font color='#0000FF'>#define</font> IFAST_SCALE_BITS  <font color='#979000'>2</font>	<font color='#009900'>/* fractional bits in scale factors */</font>
<font color='#0000FF'>#else</font>
<font color='#0000FF'>typedef</font> INT32 IFAST_MULT_TYPE;	<font color='#009900'>/* need 32 bits for scaled quantizers */</font>
<font color='#0000FF'>#define</font> IFAST_SCALE_BITS  <font color='#979000'>13</font>	<font color='#009900'>/* fractional bits in scale factors */</font>
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>typedef</font> FAST_FLOAT FLOAT_MULT_TYPE; <font color='#009900'>/* preferred floating type */</font>


<font color='#009900'>/*
 * Each IDCT routine is responsible for range-limiting its results and
 * converting them to unsigned form (0..MAXJSAMPLE).  The raw outputs could
 * be quite far out of range if the input data is corrupt, so a bulletproof
 * range-limiting step is required.  We use a mask-and-table-lookup method
 * to do the combined operations quickly.  See the comments with
 * prepare_range_limit_table (in jdmaster.c) for more info.
 */</font>

<font color='#0000FF'>#define</font> IDCT_range_limit<font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>  <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font><font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>sample_range_limit <font color='#5555FF'>+</font> CENTERJSAMPLE<font face='Lucida Console'>)</font>

<font color='#0000FF'>#define</font> RANGE_MASK  <font face='Lucida Console'>(</font>MAXJSAMPLE <font color='#5555FF'>*</font> <font color='#979000'>4</font> <font color='#5555FF'>+</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font> <font color='#009900'>/* 2 bits wider than legal samples */</font>


<font color='#009900'>/* Short forms of external names for systems with brain-damaged linkers. */</font>

<font color='#0000FF'>#ifdef</font> NEED_SHORT_EXTERNAL_NAMES
<font color='#0000FF'>#define</font> jpeg_fdct_islow		jFDislow
<font color='#0000FF'>#define</font> jpeg_fdct_ifast		jFDifast
<font color='#0000FF'>#define</font> jpeg_fdct_float		jFDfloat
<font color='#0000FF'>#define</font> jpeg_fdct_7x7		jFD7x7
<font color='#0000FF'>#define</font> jpeg_fdct_6x6		jFD6x6
<font color='#0000FF'>#define</font> jpeg_fdct_5x5		jFD5x5
<font color='#0000FF'>#define</font> jpeg_fdct_4x4		jFD4x4
<font color='#0000FF'>#define</font> jpeg_fdct_3x3		jFD3x3
<font color='#0000FF'>#define</font> jpeg_fdct_2x2		jFD2x2
<font color='#0000FF'>#define</font> jpeg_fdct_1x1		jFD1x1
<font color='#0000FF'>#define</font> jpeg_fdct_9x9		jFD9x9
<font color='#0000FF'>#define</font> jpeg_fdct_10x10		jFD10x10
<font color='#0000FF'>#define</font> jpeg_fdct_11x11		jFD11x11
<font color='#0000FF'>#define</font> jpeg_fdct_12x12		jFD12x12
<font color='#0000FF'>#define</font> jpeg_fdct_13x13		jFD13x13
<font color='#0000FF'>#define</font> jpeg_fdct_14x14		jFD14x14
<font color='#0000FF'>#define</font> jpeg_fdct_15x15		jFD15x15
<font color='#0000FF'>#define</font> jpeg_fdct_16x16		jFD16x16
<font color='#0000FF'>#define</font> jpeg_fdct_16x8		jFD16x8
<font color='#0000FF'>#define</font> jpeg_fdct_14x7		jFD14x7
<font color='#0000FF'>#define</font> jpeg_fdct_12x6		jFD12x6
<font color='#0000FF'>#define</font> jpeg_fdct_10x5		jFD10x5
<font color='#0000FF'>#define</font> jpeg_fdct_8x4		jFD8x4
<font color='#0000FF'>#define</font> jpeg_fdct_6x3		jFD6x3
<font color='#0000FF'>#define</font> jpeg_fdct_4x2		jFD4x2
<font color='#0000FF'>#define</font> jpeg_fdct_2x1		jFD2x1
<font color='#0000FF'>#define</font> jpeg_fdct_8x16		jFD8x16
<font color='#0000FF'>#define</font> jpeg_fdct_7x14		jFD7x14
<font color='#0000FF'>#define</font> jpeg_fdct_6x12		jFD6x12
<font color='#0000FF'>#define</font> jpeg_fdct_5x10		jFD5x10
<font color='#0000FF'>#define</font> jpeg_fdct_4x8		jFD4x8
<font color='#0000FF'>#define</font> jpeg_fdct_3x6		jFD3x6
<font color='#0000FF'>#define</font> jpeg_fdct_2x4		jFD2x4
<font color='#0000FF'>#define</font> jpeg_fdct_1x2		jFD1x2
<font color='#0000FF'>#define</font> jpeg_idct_islow		jRDislow
<font color='#0000FF'>#define</font> jpeg_idct_ifast		jRDifast
<font color='#0000FF'>#define</font> jpeg_idct_float		jRDfloat
<font color='#0000FF'>#define</font> jpeg_idct_7x7		jRD7x7
<font color='#0000FF'>#define</font> jpeg_idct_6x6		jRD6x6
<font color='#0000FF'>#define</font> jpeg_idct_5x5		jRD5x5
<font color='#0000FF'>#define</font> jpeg_idct_4x4		jRD4x4
<font color='#0000FF'>#define</font> jpeg_idct_3x3		jRD3x3
<font color='#0000FF'>#define</font> jpeg_idct_2x2		jRD2x2
<font color='#0000FF'>#define</font> jpeg_idct_1x1		jRD1x1
<font color='#0000FF'>#define</font> jpeg_idct_9x9		jRD9x9
<font color='#0000FF'>#define</font> jpeg_idct_10x10		jRD10x10
<font color='#0000FF'>#define</font> jpeg_idct_11x11		jRD11x11
<font color='#0000FF'>#define</font> jpeg_idct_12x12		jRD12x12
<font color='#0000FF'>#define</font> jpeg_idct_13x13		jRD13x13
<font color='#0000FF'>#define</font> jpeg_idct_14x14		jRD14x14
<font color='#0000FF'>#define</font> jpeg_idct_15x15		jRD15x15
<font color='#0000FF'>#define</font> jpeg_idct_16x16		jRD16x16
<font color='#0000FF'>#define</font> jpeg_idct_16x8		jRD16x8
<font color='#0000FF'>#define</font> jpeg_idct_14x7		jRD14x7
<font color='#0000FF'>#define</font> jpeg_idct_12x6		jRD12x6
<font color='#0000FF'>#define</font> jpeg_idct_10x5		jRD10x5
<font color='#0000FF'>#define</font> jpeg_idct_8x4		jRD8x4
<font color='#0000FF'>#define</font> jpeg_idct_6x3		jRD6x3
<font color='#0000FF'>#define</font> jpeg_idct_4x2		jRD4x2
<font color='#0000FF'>#define</font> jpeg_idct_2x1		jRD2x1
<font color='#0000FF'>#define</font> jpeg_idct_8x16		jRD8x16
<font color='#0000FF'>#define</font> jpeg_idct_7x14		jRD7x14
<font color='#0000FF'>#define</font> jpeg_idct_6x12		jRD6x12
<font color='#0000FF'>#define</font> jpeg_idct_5x10		jRD5x10
<font color='#0000FF'>#define</font> jpeg_idct_4x8		jRD4x8
<font color='#0000FF'>#define</font> jpeg_idct_3x6		jRD3x8
<font color='#0000FF'>#define</font> jpeg_idct_2x4		jRD2x4
<font color='#0000FF'>#define</font> jpeg_idct_1x2		jRD1x2
<font color='#0000FF'>#endif</font> <font color='#009900'>/* NEED_SHORT_EXTERNAL_NAMES */</font>

<font color='#009900'>/* Extern declarations for the forward and inverse DCT routines. */</font>

<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_islow
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_ifast
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_float
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>FAST_FLOAT <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_7x7
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_6x6
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_5x5
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_4x4
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_3x3
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_2x2
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_1x1
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_9x9
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_10x10
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_11x11
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_12x12
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_13x13
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_14x14
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_15x15
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_16x16
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_16x8
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_14x7
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_12x6
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_10x5
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_8x4
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_6x3
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_4x2
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_2x1
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_8x16
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_7x14
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_6x12
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_5x10
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_4x8
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_3x6
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_2x4
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_fdct_1x2
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font> data, JSAMPARRAY sample_data, JDIMENSION start_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;

<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_islow
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_ifast
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_float
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_7x7
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_6x6
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_5x5
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_4x4
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_3x3
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_2x2
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_1x1
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_9x9
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_10x10
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_11x11
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_12x12
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_13x13
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_14x14
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_15x15
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_16x16
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_16x8
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_14x7
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_12x6
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_10x5
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_8x4
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_6x3
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_4x2
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_2x1
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_8x16
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_7x14
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_6x12
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_5x10
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_4x8
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_3x6
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_2x4
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b><a name='EXTERN'></a>EXTERN</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> jpeg_idct_1x2
    <b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;


<font color='#009900'>/*
 * Macros for handling fixed-point arithmetic; these are used by many
 * but not all of the DCT/IDCT modules.
 *
 * All values are expected to be of type INT32.
 * Fractional constants are scaled left by CONST_BITS bits.
 * CONST_BITS is defined within each module using these macros,
 * and may differ from one module to the next.
 */</font>

<font color='#0000FF'>#define</font> ONE	<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT32<font face='Lucida Console'>)</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>
<font color='#0000FF'>#define</font> CONST_SCALE <font face='Lucida Console'>(</font>ONE <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> CONST_BITS<font face='Lucida Console'>)</font>

<font color='#009900'>/* Convert a positive real constant to an integer scaled by CONST_SCALE.
 * Caution: some C compilers fail to reduce "FIX(constant)" at compile time,
 * thus causing a lot of useless floating-point operations at run time.
 */</font>

<font color='#0000FF'>#define</font> FIX<font face='Lucida Console'>(</font>x<font face='Lucida Console'>)</font>	<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT32<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>x<font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> CONST_SCALE <font color='#5555FF'>+</font> <font color='#979000'>0.5</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>

<font color='#009900'>/* Descale and correctly round an INT32 value that's scaled by N bits.
 * We assume RIGHT_SHIFT rounds towards minus infinity, so adding
 * the fudge factor is correct for either sign of X.
 */</font>

<font color='#0000FF'>#define</font> DESCALE<font face='Lucida Console'>(</font>x,n<font face='Lucida Console'>)</font>  RIGHT_SHIFT<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>x<font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font face='Lucida Console'>(</font>ONE <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>n<font face='Lucida Console'>)</font><font color='#5555FF'>-</font><font color='#979000'>1</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>, n<font face='Lucida Console'>)</font>

<font color='#009900'>/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
 * This macro is used only when the two inputs will actually be no more than
 * 16 bits wide, so that a 16x16-&gt;32 bit multiply can be used instead of a
 * full 32x32 multiply.  This provides a useful speedup on many machines.
 * Unfortunately there is no way to specify a 16x16-&gt;32 multiply portably
 * in C, but some C compilers will do the right thing if you provide the
 * correct combination of casts.
 */</font>

<font color='#0000FF'>#ifdef</font> SHORTxSHORT_32		<font color='#009900'>/* may work if 'int' is 32 bits */</font>
<font color='#0000FF'>#define</font> MULTIPLY16C16<font face='Lucida Console'>(</font>var,<font color='#0000FF'>const</font><font face='Lucida Console'>)</font>  <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT16<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>var<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT16<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#ifdef</font> SHORTxLCONST_32		<font color='#009900'>/* known to work with Microsoft C 6.0 */</font>
<font color='#0000FF'>#define</font> MULTIPLY16C16<font face='Lucida Console'>(</font>var,<font color='#0000FF'>const</font><font face='Lucida Console'>)</font>  <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT16<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>var<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT32<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
<font color='#0000FF'>#endif</font>

<font color='#0000FF'>#ifndef</font> MULTIPLY16C16		<font color='#009900'>/* default definition */</font>
<font color='#0000FF'>#define</font> MULTIPLY16C16<font face='Lucida Console'>(</font>var,<font color='#0000FF'>const</font><font face='Lucida Console'>)</font>  <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>var<font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font><font color='#0000FF'>const</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
<font color='#0000FF'>#endif</font>

<font color='#009900'>/* Same except both inputs are variables. */</font>

<font color='#0000FF'>#ifdef</font> SHORTxSHORT_32		<font color='#009900'>/* may work if 'int' is 32 bits */</font>
<font color='#0000FF'>#define</font> MULTIPLY16V16<font face='Lucida Console'>(</font>var1,var2<font face='Lucida Console'>)</font>  <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT16<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>var1<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT16<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>var2<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
<font color='#0000FF'>#endif</font>

<font color='#0000FF'>#ifndef</font> MULTIPLY16V16		<font color='#009900'>/* default definition */</font>
<font color='#0000FF'>#define</font> MULTIPLY16V16<font face='Lucida Console'>(</font>var1,var2<font face='Lucida Console'>)</font>  <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>var1<font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font>var2<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
<font color='#0000FF'>#endif</font>

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