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<html><head><title>dlib C++ Library - jcdctmgr.c</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>/*
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* jcdctmgr.c
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*
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains the forward-DCT management logic.
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* This code selects a particular DCT implementation to be used,
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* and it performs related housekeeping chores including coefficient
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* quantization.
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*/</font>
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<font color='#0000FF'>#define</font> JPEG_INTERNALS
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jinclude.h.html'>jinclude.h</a>"
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jpeglib.h.html'>jpeglib.h</a>"
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jdct.h.html'>jdct.h</a>" <font color='#009900'>/* Private declarations for DCT subsystem */</font>
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<font color='#009900'>/* Private subobject for this module */</font>
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<font color='#0000FF'>typedef</font> <font color='#0000FF'>struct</font> <b>{</b>
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<font color='#0000FF'>struct</font> jpeg_forward_dct pub; <font color='#009900'>/* public fields */</font>
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<font color='#009900'>/* Pointer to the DCT routine actually in use */</font>
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forward_DCT_method_ptr do_dct[MAX_COMPONENTS];
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<font color='#009900'>/* The actual post-DCT divisors --- not identical to the quant table
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* entries, because of scaling (especially for an unnormalized DCT).
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* Each table is given in normal array order.
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*/</font>
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DCTELEM <font color='#5555FF'>*</font> divisors[NUM_QUANT_TBLS];
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<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
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<font color='#009900'>/* Same as above for the floating-point case. */</font>
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float_DCT_method_ptr do_float_dct[MAX_COMPONENTS];
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FAST_FLOAT <font color='#5555FF'>*</font> float_divisors[NUM_QUANT_TBLS];
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<font color='#0000FF'>#endif</font>
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<b>}</b> my_fdct_controller;
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<font color='#0000FF'>typedef</font> my_fdct_controller <font color='#5555FF'>*</font> my_fdct_ptr;
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<font color='#009900'>/* The current scaled-DCT routines require ISLOW-style divisor tables,
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* so be sure to compile that code if either ISLOW or SCALING is requested.
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*/</font>
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<font color='#0000FF'>#ifdef</font> DCT_ISLOW_SUPPORTED
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<font color='#0000FF'>#define</font> PROVIDE_ISLOW_TABLES
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<font color='#0000FF'>#else</font>
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<font color='#0000FF'>#ifdef</font> DCT_SCALING_SUPPORTED
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<font color='#0000FF'>#define</font> PROVIDE_ISLOW_TABLES
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<font color='#0000FF'>#endif</font>
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<font color='#0000FF'>#endif</font>
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<font color='#009900'>/*
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* Perform forward DCT on one or more blocks of a component.
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*
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* The input samples are taken from the sample_data[] array starting at
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* position start_row/start_col, and moving to the right for any additional
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* blocks. The quantized coefficients are returned in coef_blocks[].
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='forward_DCT'></a>forward_DCT</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
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JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
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JDIMENSION start_row, JDIMENSION start_col,
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JDIMENSION num_blocks<font face='Lucida Console'>)</font>
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<font color='#009900'>/* This version is used for integer DCT implementations. */</font>
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<b>{</b>
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<font color='#009900'>/* This routine is heavily used, so it's worth coding it tightly. */</font>
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my_fdct_ptr fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct;
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forward_DCT_method_ptr do_dct <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>component_index];
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DCTELEM <font color='#5555FF'>*</font> divisors <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_no];
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DCTELEM workspace[DCTSIZE2]; <font color='#009900'>/* work area for FDCT subroutine */</font>
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JDIMENSION bi;
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sample_data <font color='#5555FF'>+</font><font color='#5555FF'>=</font> start_row; <font color='#009900'>/* fold in the vertical offset once */</font>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>bi <font color='#5555FF'>=</font> <font color='#979000'>0</font>; bi <font color='#5555FF'><</font> num_blocks; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, start_col <font color='#5555FF'>+</font><font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size<font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Perform the DCT */</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>do_dct<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>workspace, sample_data, start_col<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Quantize/descale the coefficients, and store into coef_blocks[] */</font>
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<b>{</b> <font color='#0000FF'>register</font> DCTELEM temp, qval;
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<font color='#0000FF'>register</font> <font color='#0000FF'><u>int</u></font> i;
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<font color='#0000FF'>register</font> JCOEFPTR output_ptr <font color='#5555FF'>=</font> coef_blocks[bi];
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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qval <font color='#5555FF'>=</font> divisors[i];
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temp <font color='#5555FF'>=</font> workspace[i];
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<font color='#009900'>/* Divide the coefficient value by qval, ensuring proper rounding.
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* Since C does not specify the direction of rounding for negative
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* quotients, we have to force the dividend positive for portability.
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*
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* In most files, at least half of the output values will be zero
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* (at default quantization settings, more like three-quarters...)
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* so we should ensure that this case is fast. On many machines,
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* a comparison is enough cheaper than a divide to make a special test
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* a win. Since both inputs will be nonnegative, we need only test
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* for a < b to discover whether a/b is 0.
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* If your machine's division is fast enough, define FAST_DIVIDE.
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*/</font>
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<font color='#0000FF'>#ifdef</font> FAST_DIVIDE
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<font color='#0000FF'>#define</font> DIVIDE_BY<font face='Lucida Console'>(</font>a,b<font face='Lucida Console'>)</font> a <font color='#5555FF'>/</font><font color='#5555FF'>=</font> b
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<font color='#0000FF'>#else</font>
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<font color='#0000FF'>#define</font> DIVIDE_BY<font face='Lucida Console'>(</font>a,b<font face='Lucida Console'>)</font> <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>a <font color='#5555FF'>></font><font color='#5555FF'>=</font> b<font face='Lucida Console'>)</font> a <font color='#5555FF'>/</font><font color='#5555FF'>=</font> b; <font color='#0000FF'>else</font> a <font color='#5555FF'>=</font> <font color='#979000'>0</font>
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<font color='#0000FF'>#endif</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>temp <font color='#5555FF'><</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <b>{</b>
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temp <font color='#5555FF'>=</font> <font color='#5555FF'>-</font>temp;
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temp <font color='#5555FF'>+</font><font color='#5555FF'>=</font> qval<font color='#5555FF'>></font><font color='#5555FF'>></font><font color='#979000'>1</font>; <font color='#009900'>/* for rounding */</font>
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<font color='#BB00BB'>DIVIDE_BY</font><font face='Lucida Console'>(</font>temp, qval<font face='Lucida Console'>)</font>;
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temp <font color='#5555FF'>=</font> <font color='#5555FF'>-</font>temp;
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<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
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temp <font color='#5555FF'>+</font><font color='#5555FF'>=</font> qval<font color='#5555FF'>></font><font color='#5555FF'>></font><font color='#979000'>1</font>; <font color='#009900'>/* for rounding */</font>
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<font color='#BB00BB'>DIVIDE_BY</font><font face='Lucida Console'>(</font>temp, qval<font face='Lucida Console'>)</font>;
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<b>}</b>
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output_ptr[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JCOEF<font face='Lucida Console'>)</font> temp;
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<b>}</b>
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<b>}</b>
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<b>}</b>
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<b>}</b>
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<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='forward_DCT_float'></a>forward_DCT_float</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
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JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
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JDIMENSION start_row, JDIMENSION start_col,
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JDIMENSION num_blocks<font face='Lucida Console'>)</font>
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<font color='#009900'>/* This version is used for floating-point DCT implementations. */</font>
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<b>{</b>
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<font color='#009900'>/* This routine is heavily used, so it's worth coding it tightly. */</font>
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my_fdct_ptr fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct;
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float_DCT_method_ptr do_dct <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_float_dct[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>component_index];
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FAST_FLOAT <font color='#5555FF'>*</font> divisors <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_no];
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FAST_FLOAT workspace[DCTSIZE2]; <font color='#009900'>/* work area for FDCT subroutine */</font>
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JDIMENSION bi;
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sample_data <font color='#5555FF'>+</font><font color='#5555FF'>=</font> start_row; <font color='#009900'>/* fold in the vertical offset once */</font>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>bi <font color='#5555FF'>=</font> <font color='#979000'>0</font>; bi <font color='#5555FF'><</font> num_blocks; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, start_col <font color='#5555FF'>+</font><font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size<font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Perform the DCT */</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>do_dct<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>workspace, sample_data, start_col<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Quantize/descale the coefficients, and store into coef_blocks[] */</font>
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<b>{</b> <font color='#0000FF'>register</font> FAST_FLOAT temp;
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<font color='#0000FF'>register</font> <font color='#0000FF'><u>int</u></font> i;
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<font color='#0000FF'>register</font> JCOEFPTR output_ptr <font color='#5555FF'>=</font> coef_blocks[bi];
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Apply the quantization and scaling factor */</font>
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temp <font color='#5555FF'>=</font> workspace[i] <font color='#5555FF'>*</font> divisors[i];
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<font color='#009900'>/* Round to nearest integer.
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* Since C does not specify the direction of rounding for negative
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* quotients, we have to force the dividend positive for portability.
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* The maximum coefficient size is +-16K (for 12-bit data), so this
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* code should work for either 16-bit or 32-bit ints.
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*/</font>
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output_ptr[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JCOEF<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>temp <font color='#5555FF'>+</font> <font face='Lucida Console'>(</font>FAST_FLOAT<font face='Lucida Console'>)</font> <font color='#979000'>16384.5</font><font face='Lucida Console'>)</font> <font color='#5555FF'>-</font> <font color='#979000'>16384</font><font face='Lucida Console'>)</font>;
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<b>}</b>
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<b>}</b>
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<b>}</b>
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<b>}</b>
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<font color='#0000FF'>#endif</font> <font color='#009900'>/* DCT_FLOAT_SUPPORTED */</font>
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<font color='#009900'>/*
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* Initialize for a processing pass.
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* Verify that all referenced Q-tables are present, and set up
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* the divisor table for each one.
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* In the current implementation, DCT of all components is done during
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* the first pass, even if only some components will be output in the
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* first scan. Hence all components should be examined here.
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='start_pass_fdctmgr'></a>start_pass_fdctmgr</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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my_fdct_ptr fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct;
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<font color='#0000FF'><u>int</u></font> ci, qtblno, i;
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jpeg_component_info <font color='#5555FF'>*</font>compptr;
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<font color='#0000FF'><u>int</u></font> method <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
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JQUANT_TBL <font color='#5555FF'>*</font> qtbl;
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DCTELEM <font color='#5555FF'>*</font> dtbl;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>, compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
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ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, compptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Select the proper DCT routine for this component's scaling */</font>
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<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font> <b>{</b>
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<font color='#0000FF'>#ifdef</font> DCT_SCALING_SUPPORTED
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<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>1</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>:
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fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_1x1;
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method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>2</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>:
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fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_2x2;
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method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>3</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font>:
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fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_3x3;
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method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>4</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>:
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fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_4x4;
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method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>5</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>5</font><font face='Lucida Console'>)</font>:
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fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_5x5;
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method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>6</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>6</font><font face='Lucida Console'>)</font>:
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fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_6x6;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>7</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>7</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_7x7;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>9</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>9</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_9x9;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>10</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>10</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_10x10;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>11</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>11</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_11x11;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>12</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>12</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_12x12;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>13</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>13</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_13x13;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>14</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>14</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_14x14;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>15</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>15</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_15x15;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>16</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>16</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_16x16;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>16</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_16x8;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>14</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>7</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_14x7;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>12</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>6</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_12x6;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>10</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>5</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_10x5;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>8</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_8x4;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>6</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_6x3;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>4</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_4x2;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>2</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_2x1;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>8</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>16</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_8x16;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>7</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>14</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_7x14;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>6</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>12</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_6x12;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>5</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>10</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_5x10;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>4</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_4x8;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>3</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>6</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_3x6;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>2</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_2x4;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>1</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_1x2;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTSIZE <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> DCTSIZE<font face='Lucida Console'>)</font>:
|
|
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>dct_method<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>#ifdef</font> DCT_ISLOW_SUPPORTED
|
|
<font color='#0000FF'>case</font> JDCT_ISLOW:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_islow;
|
|
method <font color='#5555FF'>=</font> JDCT_ISLOW;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>#ifdef</font> DCT_IFAST_SUPPORTED
|
|
<font color='#0000FF'>case</font> JDCT_IFAST:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_ifast;
|
|
method <font color='#5555FF'>=</font> JDCT_IFAST;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
|
|
<font color='#0000FF'>case</font> JDCT_FLOAT:
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_float_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_float;
|
|
method <font color='#5555FF'>=</font> JDCT_FLOAT;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>default</font>:
|
|
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_NOT_COMPILED<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>break</font>;
|
|
<b>}</b>
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>default</font>:
|
|
<font color='#BB00BB'>ERREXIT2</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_DCTSIZE,
|
|
compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size, compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>break</font>;
|
|
<b>}</b>
|
|
qtblno <font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_no;
|
|
<font color='#009900'>/* Make sure specified quantization table is present */</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>qtblno <font color='#5555FF'><</font> <font color='#979000'>0</font> <font color='#5555FF'>|</font><font color='#5555FF'>|</font> qtblno <font color='#5555FF'>></font><font color='#5555FF'>=</font> NUM_QUANT_TBLS <font color='#5555FF'>|</font><font color='#5555FF'>|</font>
|
|
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_ptrs[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
|
|
<font color='#BB00BB'>ERREXIT1</font><font face='Lucida Console'>(</font>cinfo, JERR_NO_QUANT_TABLE, qtblno<font face='Lucida Console'>)</font>;
|
|
qtbl <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_ptrs[qtblno];
|
|
<font color='#009900'>/* Compute divisors for this quant table */</font>
|
|
<font color='#009900'>/* We may do this more than once for same table, but it's not a big deal */</font>
|
|
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>method<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>#ifdef</font> PROVIDE_ISLOW_TABLES
|
|
<font color='#0000FF'>case</font> JDCT_ISLOW:
|
|
<font color='#009900'>/* For LL&M IDCT method, divisors are equal to raw quantization
|
|
* coefficients multiplied by 8 (to counteract scaling).
|
|
*/</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b>
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
|
|
DCTSIZE2 <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
dtbl <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno];
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
dtbl[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font> qtbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>quantval[i]<font face='Lucida Console'>)</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>3</font>;
|
|
<b>}</b>
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.forward_DCT[ci] <font color='#5555FF'>=</font> forward_DCT;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>#ifdef</font> DCT_IFAST_SUPPORTED
|
|
<font color='#0000FF'>case</font> JDCT_IFAST:
|
|
<b>{</b>
|
|
<font color='#009900'>/* For AA&N IDCT method, divisors are equal to quantization
|
|
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
|
* scalefactor[0] = 1
|
|
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
|
* We apply a further scale factor of 8.
|
|
*/</font>
|
|
<font color='#0000FF'>#define</font> CONST_BITS <font color='#979000'>14</font>
|
|
<font color='#0000FF'>static</font> <font color='#0000FF'>const</font> INT16 aanscales[DCTSIZE2] <font color='#5555FF'>=</font> <b>{</b>
|
|
<font color='#009900'>/* precomputed values scaled up by 14 bits */</font>
|
|
<font color='#979000'>16384</font>, <font color='#979000'>22725</font>, <font color='#979000'>21407</font>, <font color='#979000'>19266</font>, <font color='#979000'>16384</font>, <font color='#979000'>12873</font>, <font color='#979000'>8867</font>, <font color='#979000'>4520</font>,
|
|
<font color='#979000'>22725</font>, <font color='#979000'>31521</font>, <font color='#979000'>29692</font>, <font color='#979000'>26722</font>, <font color='#979000'>22725</font>, <font color='#979000'>17855</font>, <font color='#979000'>12299</font>, <font color='#979000'>6270</font>,
|
|
<font color='#979000'>21407</font>, <font color='#979000'>29692</font>, <font color='#979000'>27969</font>, <font color='#979000'>25172</font>, <font color='#979000'>21407</font>, <font color='#979000'>16819</font>, <font color='#979000'>11585</font>, <font color='#979000'>5906</font>,
|
|
<font color='#979000'>19266</font>, <font color='#979000'>26722</font>, <font color='#979000'>25172</font>, <font color='#979000'>22654</font>, <font color='#979000'>19266</font>, <font color='#979000'>15137</font>, <font color='#979000'>10426</font>, <font color='#979000'>5315</font>,
|
|
<font color='#979000'>16384</font>, <font color='#979000'>22725</font>, <font color='#979000'>21407</font>, <font color='#979000'>19266</font>, <font color='#979000'>16384</font>, <font color='#979000'>12873</font>, <font color='#979000'>8867</font>, <font color='#979000'>4520</font>,
|
|
<font color='#979000'>12873</font>, <font color='#979000'>17855</font>, <font color='#979000'>16819</font>, <font color='#979000'>15137</font>, <font color='#979000'>12873</font>, <font color='#979000'>10114</font>, <font color='#979000'>6967</font>, <font color='#979000'>3552</font>,
|
|
<font color='#979000'>8867</font>, <font color='#979000'>12299</font>, <font color='#979000'>11585</font>, <font color='#979000'>10426</font>, <font color='#979000'>8867</font>, <font color='#979000'>6967</font>, <font color='#979000'>4799</font>, <font color='#979000'>2446</font>,
|
|
<font color='#979000'>4520</font>, <font color='#979000'>6270</font>, <font color='#979000'>5906</font>, <font color='#979000'>5315</font>, <font color='#979000'>4520</font>, <font color='#979000'>3552</font>, <font color='#979000'>2446</font>, <font color='#979000'>1247</font>
|
|
<b>}</b>;
|
|
SHIFT_TEMPS
|
|
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b>
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
|
|
DCTSIZE2 <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
dtbl <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno];
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
dtbl[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font>
|
|
<font color='#BB00BB'>DESCALE</font><font face='Lucida Console'>(</font><font color='#BB00BB'>MULTIPLY16V16</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT32<font face='Lucida Console'>)</font> qtbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>quantval[i],
|
|
<font face='Lucida Console'>(</font>INT32<font face='Lucida Console'>)</font> aanscales[i]<font face='Lucida Console'>)</font>,
|
|
CONST_BITS<font color='#5555FF'>-</font><font color='#979000'>3</font><font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.forward_DCT[ci] <font color='#5555FF'>=</font> forward_DCT;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
|
|
<font color='#0000FF'>case</font> JDCT_FLOAT:
|
|
<b>{</b>
|
|
<font color='#009900'>/* For float AA&N IDCT method, divisors are equal to quantization
|
|
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
|
* scalefactor[0] = 1
|
|
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
|
* We apply a further scale factor of 8.
|
|
* What's actually stored is 1/divisor so that the inner loop can
|
|
* use a multiplication rather than a division.
|
|
*/</font>
|
|
FAST_FLOAT <font color='#5555FF'>*</font> fdtbl;
|
|
<font color='#0000FF'><u>int</u></font> row, col;
|
|
<font color='#0000FF'>static</font> <font color='#0000FF'>const</font> <font color='#0000FF'><u>double</u></font> aanscalefactor[DCTSIZE] <font color='#5555FF'>=</font> <b>{</b>
|
|
<font color='#979000'>1.0</font>, <font color='#979000'>1.387039845</font>, <font color='#979000'>1.306562965</font>, <font color='#979000'>1.175875602</font>,
|
|
<font color='#979000'>1.0</font>, <font color='#979000'>0.785694958</font>, <font color='#979000'>0.541196100</font>, <font color='#979000'>0.275899379</font>
|
|
<b>}</b>;
|
|
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b>
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[qtblno] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>FAST_FLOAT <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
|
|
DCTSIZE2 <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>FAST_FLOAT<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
fdtbl <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[qtblno];
|
|
i <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>row <font color='#5555FF'>=</font> <font color='#979000'>0</font>; row <font color='#5555FF'><</font> DCTSIZE; row<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>col <font color='#5555FF'>=</font> <font color='#979000'>0</font>; col <font color='#5555FF'><</font> DCTSIZE; col<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
fdtbl[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>FAST_FLOAT<font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font color='#979000'>1.0</font> <font color='#5555FF'>/</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>double</u></font><font face='Lucida Console'>)</font> qtbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>quantval[i] <font color='#5555FF'>*</font>
|
|
aanscalefactor[row] <font color='#5555FF'>*</font> aanscalefactor[col] <font color='#5555FF'>*</font> <font color='#979000'>8.0</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
i<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.forward_DCT[ci] <font color='#5555FF'>=</font> forward_DCT_float;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>default</font>:
|
|
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_NOT_COMPILED<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>break</font>;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
|
|
<font color='#009900'>/*
|
|
* Initialize FDCT manager.
|
|
*/</font>
|
|
|
|
<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='jinit_forward_dct'></a>jinit_forward_dct</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
my_fdct_ptr fdct;
|
|
<font color='#0000FF'><u>int</u></font> i;
|
|
|
|
fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
|
|
<font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>my_fdct_controller<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> jpeg_forward_dct <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> fdct;
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.start_pass <font color='#5555FF'>=</font> start_pass_fdctmgr;
|
|
|
|
<font color='#009900'>/* Mark divisor tables unallocated */</font>
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> NUM_QUANT_TBLS; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[i] <font color='#5555FF'>=</font> NULL;
|
|
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
|
|
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[i] <font color='#5555FF'>=</font> NULL;
|
|
<font color='#0000FF'>#endif</font>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
</pre></body></html> |
