<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->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'>></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'><</font><font color='#5555FF'><</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'><</font><font color='#5555FF'><</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->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->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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