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<html><head><title>dlib C++ Library - jccoefct.c</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>/*
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* jccoefct.c
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*
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* Copyright (C) 1994-1997, Thomas G. Lane.
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* Modified 2003-2011 by Guido Vollbeding.
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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 coefficient buffer controller for compression.
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* This controller is the top level of the JPEG compressor proper.
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* The coefficient buffer lies between forward-DCT and entropy encoding steps.
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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='#009900'>/* We use a full-image coefficient buffer when doing Huffman optimization,
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* and also for writing multiple-scan JPEG files. In all cases, the DCT
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* step is run during the first pass, and subsequent passes need only read
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* the buffered coefficients.
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*/</font>
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<font color='#0000FF'>#ifdef</font> ENTROPY_OPT_SUPPORTED
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<font color='#0000FF'>#define</font> FULL_COEF_BUFFER_SUPPORTED
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<font color='#0000FF'>#else</font>
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<font color='#0000FF'>#ifdef</font> C_MULTISCAN_FILES_SUPPORTED
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<font color='#0000FF'>#define</font> FULL_COEF_BUFFER_SUPPORTED
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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'>/* Private buffer controller object */</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_c_coef_controller pub; <font color='#009900'>/* public fields */</font>
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JDIMENSION iMCU_row_num; <font color='#009900'>/* iMCU row # within image */</font>
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JDIMENSION mcu_ctr; <font color='#009900'>/* counts MCUs processed in current row */</font>
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<font color='#0000FF'><u>int</u></font> MCU_vert_offset; <font color='#009900'>/* counts MCU rows within iMCU row */</font>
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<font color='#0000FF'><u>int</u></font> MCU_rows_per_iMCU_row; <font color='#009900'>/* number of such rows needed */</font>
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<font color='#009900'>/* For single-pass compression, it's sufficient to buffer just one MCU
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* (although this may prove a bit slow in practice). We allocate a
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* workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each
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* MCU constructed and sent. (On 80x86, the workspace is FAR even though
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* it's not really very big; this is to keep the module interfaces unchanged
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* when a large coefficient buffer is necessary.)
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* In multi-pass modes, this array points to the current MCU's blocks
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* within the virtual arrays.
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*/</font>
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JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
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<font color='#009900'>/* In multi-pass modes, we need a virtual block array for each component. */</font>
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jvirt_barray_ptr whole_image[MAX_COMPONENTS];
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<b>}</b> my_coef_controller;
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<font color='#0000FF'>typedef</font> my_coef_controller <font color='#5555FF'>*</font> my_coef_ptr;
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<font color='#009900'>/* Forward declarations */</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font> compress_data
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<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPIMAGE input_buf<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>#ifdef</font> FULL_COEF_BUFFER_SUPPORTED
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font> compress_first_pass
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<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPIMAGE input_buf<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font> compress_output
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<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPIMAGE input_buf<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>#endif</font>
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<b><a name='LOCAL'></a>LOCAL</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_iMCU_row'></a>start_iMCU_row</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo<font face='Lucida Console'>)</font>
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<font color='#009900'>/* Reset within-iMCU-row counters for a new row */</font>
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<b>{</b>
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my_coef_ptr coef <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_coef_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef;
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<font color='#009900'>/* In an interleaved scan, an MCU row is the same as an iMCU row.
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* In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
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* But at the bottom of the image, process only what's left.
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*/</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comps_in_scan <font color='#5555FF'>></font> <font color='#979000'>1</font><font face='Lucida Console'>)</font> <b>{</b>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_rows_per_iMCU_row <font color='#5555FF'>=</font> <font color='#979000'>1</font>;
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<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num <font color='#5555FF'><</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows<font color='#5555FF'>-</font><font color='#979000'>1</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_rows_per_iMCU_row <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_comp_info[<font color='#979000'>0</font>]<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor;
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<font color='#0000FF'>else</font>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_rows_per_iMCU_row <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_comp_info[<font color='#979000'>0</font>]<font color='#5555FF'>-</font><font color='#5555FF'>></font>last_row_height;
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<b>}</b>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>mcu_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_vert_offset <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
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<b>}</b>
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<font color='#009900'>/*
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* Initialize for a processing pass.
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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_coef'></a>start_pass_coef</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, J_BUF_MODE pass_mode<font face='Lucida Console'>)</font>
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<b>{</b>
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my_coef_ptr coef <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_coef_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef;
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
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<font color='#BB00BB'>start_iMCU_row</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>pass_mode<font face='Lucida Console'>)</font> <b>{</b>
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<font color='#0000FF'>case</font> JBUF_PASS_THRU:
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[<font color='#979000'>0</font>] <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.compress_data <font color='#5555FF'>=</font> compress_data;
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>#ifdef</font> FULL_COEF_BUFFER_SUPPORTED
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<font color='#0000FF'>case</font> JBUF_SAVE_AND_PASS:
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[<font color='#979000'>0</font>] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.compress_data <font color='#5555FF'>=</font> compress_first_pass;
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>case</font> JBUF_CRANK_DEST:
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[<font color='#979000'>0</font>] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.compress_data <font color='#5555FF'>=</font> compress_output;
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<font color='#0000FF'>break</font>;
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<font color='#0000FF'>#endif</font>
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<font color='#0000FF'>default</font>:
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>break</font>;
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<b>}</b>
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<b>}</b>
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<font color='#009900'>/*
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* Process some data in the single-pass case.
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* We process the equivalent of one fully interleaved MCU row ("iMCU" row)
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* per call, ie, v_samp_factor block rows for each component in the image.
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* Returns TRUE if the iMCU row is completed, FALSE if suspended.
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*
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* NB: input_buf contains a plane for each component in image,
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* which we index according to the component's SOF position.
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font>
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<b><a name='compress_data'></a>compress_data</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPIMAGE input_buf<font face='Lucida Console'>)</font>
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<b>{</b>
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my_coef_ptr coef <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_coef_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef;
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JDIMENSION MCU_col_num; <font color='#009900'>/* index of current MCU within row */</font>
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JDIMENSION last_MCU_col <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCUs_per_row <font color='#5555FF'>-</font> <font color='#979000'>1</font>;
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JDIMENSION last_iMCU_row <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows <font color='#5555FF'>-</font> <font color='#979000'>1</font>;
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<font color='#0000FF'><u>int</u></font> blkn, bi, ci, yindex, yoffset, blockcnt;
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JDIMENSION ypos, xpos;
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jpeg_component_info <font color='#5555FF'>*</font>compptr;
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forward_DCT_ptr forward_DCT;
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<font color='#009900'>/* Loop to write as much as one whole iMCU row */</font>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>yoffset <font color='#5555FF'>=</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_vert_offset; yoffset <font color='#5555FF'><</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_rows_per_iMCU_row;
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yoffset<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>MCU_col_num <font color='#5555FF'>=</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>mcu_ctr; MCU_col_num <font color='#5555FF'><</font><font color='#5555FF'>=</font> last_MCU_col;
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MCU_col_num<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Determine where data comes from in input_buf and do the DCT thing.
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* Each call on forward_DCT processes a horizontal row of DCT blocks
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* as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks
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* sequentially. Dummy blocks at the right or bottom edge are filled in
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* specially. The data in them does not matter for image reconstruction,
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* so we fill them with values that will encode to the smallest amount of
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* data, viz: all zeroes in the AC entries, DC entries equal to previous
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* block's DC value. (Thanks to Thomas Kinsman for this idea.)
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*/</font>
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blkn <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comps_in_scan; ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_comp_info[ci];
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forward_DCT <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>forward_DCT[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>component_index];
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blockcnt <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>MCU_col_num <font color='#5555FF'><</font> last_MCU_col<font face='Lucida Console'>)</font> ? compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width
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: compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>last_col_width;
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xpos <font color='#5555FF'>=</font> MCU_col_num <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_sample_width;
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ypos <font color='#5555FF'>=</font> yoffset <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size;
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<font color='#009900'>/* ypos == (yoffset+yindex) * DCTSIZE */</font>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>yindex <font color='#5555FF'>=</font> <font color='#979000'>0</font>; yindex <font color='#5555FF'><</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_height; yindex<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num <font color='#5555FF'><</font> last_iMCU_row <font color='#5555FF'>|</font><font color='#5555FF'>|</font>
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yoffset<font color='#5555FF'>+</font>yindex <font color='#5555FF'><</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>last_row_height<font face='Lucida Console'>)</font> <b>{</b>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>forward_DCT<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, compptr,
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input_buf[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>component_index],
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn],
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ypos, xpos, <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> blockcnt<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>blockcnt <font color='#5555FF'><</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width<font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Create some dummy blocks at the right edge of the image. */</font>
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<font color='#BB00BB'>FMEMZERO</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn <font color='#5555FF'>+</font> blockcnt],
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<font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width <font color='#5555FF'>-</font> blockcnt<font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JBLOCK<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>bi <font color='#5555FF'>=</font> blockcnt; bi <font color='#5555FF'><</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn<font color='#5555FF'>+</font>bi][<font color='#979000'>0</font>][<font color='#979000'>0</font>] <font color='#5555FF'>=</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn<font color='#5555FF'>+</font>bi<font color='#5555FF'>-</font><font color='#979000'>1</font>][<font color='#979000'>0</font>][<font color='#979000'>0</font>];
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<b>}</b>
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<b>}</b>
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<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
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<font color='#009900'>/* Create a row of dummy blocks at the bottom of the image. */</font>
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<font color='#BB00BB'>FMEMZERO</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn],
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compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JBLOCK<font face='Lucida Console'>)</font><font face='Lucida Console'>)</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> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn<font color='#5555FF'>+</font>bi][<font color='#979000'>0</font>][<font color='#979000'>0</font>] <font color='#5555FF'>=</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn<font color='#5555FF'>-</font><font color='#979000'>1</font>][<font color='#979000'>0</font>][<font color='#979000'>0</font>];
|
|
<b>}</b>
|
|
<b>}</b>
|
|
blkn <font color='#5555FF'>+</font><font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width;
|
|
ypos <font color='#5555FF'>+</font><font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<font color='#009900'>/* Try to write the MCU. In event of a suspension failure, we will
|
|
* re-DCT the MCU on restart (a bit inefficient, could be fixed...)
|
|
*/</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>entropy<font color='#5555FF'>-</font><font color='#5555FF'>></font>encode_mcu<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#009900'>/* Suspension forced; update state counters and exit */</font>
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_vert_offset <font color='#5555FF'>=</font> yoffset;
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>mcu_ctr <font color='#5555FF'>=</font> MCU_col_num;
|
|
<font color='#0000FF'>return</font> FALSE;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<font color='#009900'>/* Completed an MCU row, but perhaps not an iMCU row */</font>
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>mcu_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
|
|
<b>}</b>
|
|
<font color='#009900'>/* Completed the iMCU row, advance counters for next one */</font>
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
|
|
<font color='#BB00BB'>start_iMCU_row</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>return</font> TRUE;
|
|
<b>}</b>
|
|
|
|
|
|
<font color='#0000FF'>#ifdef</font> FULL_COEF_BUFFER_SUPPORTED
|
|
|
|
<font color='#009900'>/*
|
|
* Process some data in the first pass of a multi-pass case.
|
|
* We process the equivalent of one fully interleaved MCU row ("iMCU" row)
|
|
* per call, ie, v_samp_factor block rows for each component in the image.
|
|
* This amount of data is read from the source buffer, DCT'd and quantized,
|
|
* and saved into the virtual arrays. We also generate suitable dummy blocks
|
|
* as needed at the right and lower edges. (The dummy blocks are constructed
|
|
* in the virtual arrays, which have been padded appropriately.) This makes
|
|
* it possible for subsequent passes not to worry about real vs. dummy blocks.
|
|
*
|
|
* We must also emit the data to the entropy encoder. This is conveniently
|
|
* done by calling compress_output() after we've loaded the current strip
|
|
* of the virtual arrays.
|
|
*
|
|
* NB: input_buf contains a plane for each component in image. All
|
|
* components are DCT'd and loaded into the virtual arrays in this pass.
|
|
* However, it may be that only a subset of the components are emitted to
|
|
* the entropy encoder during this first pass; be careful about looking
|
|
* at the scan-dependent variables (MCU dimensions, etc).
|
|
*/</font>
|
|
|
|
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font>
|
|
<b><a name='compress_first_pass'></a>compress_first_pass</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPIMAGE input_buf<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
my_coef_ptr coef <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_coef_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef;
|
|
JDIMENSION last_iMCU_row <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows <font color='#5555FF'>-</font> <font color='#979000'>1</font>;
|
|
JDIMENSION blocks_across, MCUs_across, MCUindex;
|
|
<font color='#0000FF'><u>int</u></font> bi, ci, h_samp_factor, block_row, block_rows, ndummy;
|
|
JCOEF lastDC;
|
|
jpeg_component_info <font color='#5555FF'>*</font>compptr;
|
|
JBLOCKARRAY buffer;
|
|
JBLOCKROW thisblockrow, lastblockrow;
|
|
forward_DCT_ptr forward_DCT;
|
|
|
|
<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;
|
|
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>
|
|
<font color='#009900'>/* Align the virtual buffer for this component. */</font>
|
|
buffer <font color='#5555FF'>=</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>access_virt_barray<font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[ci],
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor,
|
|
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor, TRUE<font face='Lucida Console'>)</font>;
|
|
<font color='#009900'>/* Count non-dummy DCT block rows in this iMCU row. */</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num <font color='#5555FF'><</font> last_iMCU_row<font face='Lucida Console'>)</font>
|
|
block_rows <font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor;
|
|
<font color='#0000FF'>else</font> <b>{</b>
|
|
<font color='#009900'>/* NB: can't use last_row_height here, since may not be set! */</font>
|
|
block_rows <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>height_in_blocks <font color='#5555FF'>%</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>block_rows <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> block_rows <font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor;
|
|
<b>}</b>
|
|
blocks_across <font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>width_in_blocks;
|
|
h_samp_factor <font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>h_samp_factor;
|
|
<font color='#009900'>/* Count number of dummy blocks to be added at the right margin. */</font>
|
|
ndummy <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>blocks_across <font color='#5555FF'>%</font> h_samp_factor<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>ndummy <font color='#5555FF'>></font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
|
|
ndummy <font color='#5555FF'>=</font> h_samp_factor <font color='#5555FF'>-</font> ndummy;
|
|
forward_DCT <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>forward_DCT[ci];
|
|
<font color='#009900'>/* Perform DCT for all non-dummy blocks in this iMCU row. Each call
|
|
* on forward_DCT processes a complete horizontal row of DCT blocks.
|
|
*/</font>
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>block_row <font color='#5555FF'>=</font> <font color='#979000'>0</font>; block_row <font color='#5555FF'><</font> block_rows; block_row<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
thisblockrow <font color='#5555FF'>=</font> buffer[block_row];
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>forward_DCT<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, compptr, input_buf[ci], thisblockrow,
|
|
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>block_row <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font>,
|
|
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font color='#979000'>0</font>, blocks_across<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>ndummy <font color='#5555FF'>></font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#009900'>/* Create dummy blocks at the right edge of the image. */</font>
|
|
thisblockrow <font color='#5555FF'>+</font><font color='#5555FF'>=</font> blocks_across; <font color='#009900'>/* => first dummy block */</font>
|
|
<font color='#BB00BB'>FMEMZERO</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> thisblockrow, ndummy <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JBLOCK<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
lastDC <font color='#5555FF'>=</font> thisblockrow[<font color='#5555FF'>-</font><font color='#979000'>1</font>][<font color='#979000'>0</font>];
|
|
<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> ndummy; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
thisblockrow[bi][<font color='#979000'>0</font>] <font color='#5555FF'>=</font> lastDC;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<font color='#009900'>/* If at end of image, create dummy block rows as needed.
|
|
* The tricky part here is that within each MCU, we want the DC values
|
|
* of the dummy blocks to match the last real block's DC value.
|
|
* This squeezes a few more bytes out of the resulting file...
|
|
*/</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num <font color='#5555FF'>=</font><font color='#5555FF'>=</font> last_iMCU_row<font face='Lucida Console'>)</font> <b>{</b>
|
|
blocks_across <font color='#5555FF'>+</font><font color='#5555FF'>=</font> ndummy; <font color='#009900'>/* include lower right corner */</font>
|
|
MCUs_across <font color='#5555FF'>=</font> blocks_across <font color='#5555FF'>/</font> h_samp_factor;
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>block_row <font color='#5555FF'>=</font> block_rows; block_row <font color='#5555FF'><</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor;
|
|
block_row<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
thisblockrow <font color='#5555FF'>=</font> buffer[block_row];
|
|
lastblockrow <font color='#5555FF'>=</font> buffer[block_row<font color='#5555FF'>-</font><font color='#979000'>1</font>];
|
|
<font color='#BB00BB'>FMEMZERO</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font> FAR <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> thisblockrow,
|
|
<font face='Lucida Console'>(</font><font color='#0000FF'><u>size_t</u></font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>blocks_across <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JBLOCK<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>MCUindex <font color='#5555FF'>=</font> <font color='#979000'>0</font>; MCUindex <font color='#5555FF'><</font> MCUs_across; MCUindex<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
lastDC <font color='#5555FF'>=</font> lastblockrow[h_samp_factor<font color='#5555FF'>-</font><font color='#979000'>1</font>][<font color='#979000'>0</font>];
|
|
<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> h_samp_factor; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
thisblockrow[bi][<font color='#979000'>0</font>] <font color='#5555FF'>=</font> lastDC;
|
|
<b>}</b>
|
|
thisblockrow <font color='#5555FF'>+</font><font color='#5555FF'>=</font> h_samp_factor; <font color='#009900'>/* advance to next MCU in row */</font>
|
|
lastblockrow <font color='#5555FF'>+</font><font color='#5555FF'>=</font> h_samp_factor;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<font color='#009900'>/* NB: compress_output will increment iMCU_row_num if successful.
|
|
* A suspension return will result in redoing all the work above next time.
|
|
*/</font>
|
|
|
|
<font color='#009900'>/* Emit data to the entropy encoder, sharing code with subsequent passes */</font>
|
|
<font color='#0000FF'>return</font> <font color='#BB00BB'>compress_output</font><font face='Lucida Console'>(</font>cinfo, input_buf<font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
|
|
|
|
<font color='#009900'>/*
|
|
* Process some data in subsequent passes of a multi-pass case.
|
|
* We process the equivalent of one fully interleaved MCU row ("iMCU" row)
|
|
* per call, ie, v_samp_factor block rows for each component in the scan.
|
|
* The data is obtained from the virtual arrays and fed to the entropy coder.
|
|
* Returns TRUE if the iMCU row is completed, FALSE if suspended.
|
|
*
|
|
* NB: input_buf is ignored; it is likely to be a NULL pointer.
|
|
*/</font>
|
|
|
|
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font>
|
|
<b><a name='compress_output'></a>compress_output</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPIMAGE input_buf<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
my_coef_ptr coef <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_coef_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef;
|
|
JDIMENSION MCU_col_num; <font color='#009900'>/* index of current MCU within row */</font>
|
|
<font color='#0000FF'><u>int</u></font> blkn, ci, xindex, yindex, yoffset;
|
|
JDIMENSION start_col;
|
|
JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
|
|
JBLOCKROW buffer_ptr;
|
|
jpeg_component_info <font color='#5555FF'>*</font>compptr;
|
|
|
|
<font color='#009900'>/* Align the virtual buffers for the components used in this scan.
|
|
* NB: during first pass, this is safe only because the buffers will
|
|
* already be aligned properly, so jmemmgr.c won't need to do any I/O.
|
|
*/</font>
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comps_in_scan; ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_comp_info[ci];
|
|
buffer[ci] <font color='#5555FF'>=</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>access_virt_barray<font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>component_index],
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor,
|
|
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor, FALSE<font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
|
|
<font color='#009900'>/* Loop to process one whole iMCU row */</font>
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>yoffset <font color='#5555FF'>=</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_vert_offset; yoffset <font color='#5555FF'><</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_rows_per_iMCU_row;
|
|
yoffset<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>MCU_col_num <font color='#5555FF'>=</font> coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>mcu_ctr; MCU_col_num <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCUs_per_row;
|
|
MCU_col_num<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#009900'>/* Construct list of pointers to DCT blocks belonging to this MCU */</font>
|
|
blkn <font color='#5555FF'>=</font> <font color='#979000'>0</font>; <font color='#009900'>/* index of current DCT block within MCU */</font>
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comps_in_scan; ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_comp_info[ci];
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start_col <font color='#5555FF'>=</font> MCU_col_num <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>yindex <font color='#5555FF'>=</font> <font color='#979000'>0</font>; yindex <font color='#5555FF'><</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_height; yindex<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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buffer_ptr <font color='#5555FF'>=</font> buffer[ci][yindex<font color='#5555FF'>+</font>yoffset] <font color='#5555FF'>+</font> start_col;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>xindex <font color='#5555FF'>=</font> <font color='#979000'>0</font>; xindex <font color='#5555FF'><</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_width; xindex<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[blkn<font color='#5555FF'>+</font><font color='#5555FF'>+</font>] <font color='#5555FF'>=</font> buffer_ptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
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<b>}</b>
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<b>}</b>
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<b>}</b>
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<font color='#009900'>/* Try to write the MCU. */</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>entropy<font color='#5555FF'>-</font><font color='#5555FF'>></font>encode_mcu<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Suspension forced; update state counters and exit */</font>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_vert_offset <font color='#5555FF'>=</font> yoffset;
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>mcu_ctr <font color='#5555FF'>=</font> MCU_col_num;
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<font color='#0000FF'>return</font> FALSE;
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<b>}</b>
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<b>}</b>
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<font color='#009900'>/* Completed an MCU row, but perhaps not an iMCU row */</font>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>mcu_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
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<b>}</b>
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<font color='#009900'>/* Completed the iMCU row, advance counters for next one */</font>
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_num<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
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<font color='#BB00BB'>start_iMCU_row</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
|
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<font color='#0000FF'>return</font> TRUE;
|
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<b>}</b>
|
|
|
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<font color='#0000FF'>#endif</font> <font color='#009900'>/* FULL_COEF_BUFFER_SUPPORTED */</font>
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|
|
|
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<font color='#009900'>/*
|
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* Initialize coefficient buffer controller.
|
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*/</font>
|
|
|
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<b><a name='GLOBAL'></a>GLOBAL</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='jinit_c_coef_controller'></a>jinit_c_coef_controller</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, boolean need_full_buffer<font face='Lucida Console'>)</font>
|
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<b>{</b>
|
|
my_coef_ptr coef;
|
|
|
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coef <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_coef_ptr<font face='Lucida Console'>)</font>
|
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<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,
|
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<font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>my_coef_controller<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> jpeg_c_coef_controller <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> coef;
|
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coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.start_pass <font color='#5555FF'>=</font> start_pass_coef;
|
|
|
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<font color='#009900'>/* Create the coefficient buffer. */</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>need_full_buffer<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>#ifdef</font> FULL_COEF_BUFFER_SUPPORTED
|
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<font color='#009900'>/* Allocate a full-image virtual array for each component, */</font>
|
|
<font color='#009900'>/* padded to a multiple of samp_factor DCT blocks in each direction. */</font>
|
|
<font color='#0000FF'><u>int</u></font> ci;
|
|
jpeg_component_info <font color='#5555FF'>*</font>compptr;
|
|
|
|
<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;
|
|
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>
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[ci] <font color='#5555FF'>=</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>request_virt_barray<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, FALSE,
|
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<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font color='#BB00BB'>jround_up</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>width_in_blocks,
|
|
<font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>h_samp_factor<font face='Lucida Console'>)</font>,
|
|
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font color='#BB00BB'>jround_up</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>height_in_blocks,
|
|
<font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor<font face='Lucida Console'>)</font>,
|
|
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor<font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
<font color='#0000FF'>#else</font>
|
|
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
|
|
<font color='#009900'>/* We only need a single-MCU buffer. */</font>
|
|
JBLOCKROW buffer;
|
|
<font color='#0000FF'><u>int</u></font> i;
|
|
|
|
buffer <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JBLOCKROW<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_large<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,
|
|
C_MAX_BLOCKS_IN_MCU <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JBLOCK<font face='Lucida Console'>)</font><font face='Lucida Console'>)</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> C_MAX_BLOCKS_IN_MCU; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>MCU_buffer[i] <font color='#5555FF'>=</font> buffer <font color='#5555FF'>+</font> i;
|
|
<b>}</b>
|
|
coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[<font color='#979000'>0</font>] <font color='#5555FF'>=</font> NULL; <font color='#009900'>/* flag for no virtual arrays */</font>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
</pre></body></html> |
