<html><!-- Created using the cpp_pretty_printer from the dlib C++ library. See http://dlib.net for updates. --><head><title>dlib C++ Library - jcmainct.c</title></head><body bgcolor='white'><pre>
<font color='#009900'>/*
* jcmainct.c
*
* Copyright (C) 1994-1996, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains the main buffer controller for compression.
* The main buffer lies between the pre-processor and the JPEG
* compressor proper; it holds downsampled data in the JPEG colorspace.
*/</font>
<font color='#0000FF'>#define</font> JPEG_INTERNALS
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jinclude.h.html'>jinclude.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jpeglib.h.html'>jpeglib.h</a>"
<font color='#009900'>/* Note: currently, there is no operating mode in which a full-image buffer
* is needed at this step. If there were, that mode could not be used with
* "raw data" input, since this module is bypassed in that case. However,
* we've left the code here for possible use in special applications.
*/</font>
<font color='#0000FF'>#undef</font> FULL_MAIN_BUFFER_SUPPORTED
<font color='#009900'>/* Private buffer controller object */</font>
<font color='#0000FF'>typedef</font> <font color='#0000FF'>struct</font> <b>{</b>
<font color='#0000FF'>struct</font> jpeg_c_main_controller pub; <font color='#009900'>/* public fields */</font>
JDIMENSION cur_iMCU_row; <font color='#009900'>/* number of current iMCU row */</font>
JDIMENSION rowgroup_ctr; <font color='#009900'>/* counts row groups received in iMCU row */</font>
boolean suspended; <font color='#009900'>/* remember if we suspended output */</font>
J_BUF_MODE pass_mode; <font color='#009900'>/* current operating mode */</font>
<font color='#009900'>/* If using just a strip buffer, this points to the entire set of buffers
* (we allocate one for each component). In the full-image case, this
* points to the currently accessible strips of the virtual arrays.
*/</font>
JSAMPARRAY buffer[MAX_COMPONENTS];
<font color='#0000FF'>#ifdef</font> FULL_MAIN_BUFFER_SUPPORTED
<font color='#009900'>/* If using full-image storage, this array holds pointers to virtual-array
* control blocks for each component. Unused if not full-image storage.
*/</font>
jvirt_sarray_ptr whole_image[MAX_COMPONENTS];
<font color='#0000FF'>#endif</font>
<b>}</b> my_main_controller;
<font color='#0000FF'>typedef</font> my_main_controller <font color='#5555FF'>*</font> my_main_ptr;
<font color='#009900'>/* Forward declarations */</font>
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> process_data_simple_main
<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPARRAY input_buf,
JDIMENSION <font color='#5555FF'>*</font>in_row_ctr, JDIMENSION in_rows_avail<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>#ifdef</font> FULL_MAIN_BUFFER_SUPPORTED
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> process_data_buffer_main
<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_compress_ptr cinfo, JSAMPARRAY input_buf,
JDIMENSION <font color='#5555FF'>*</font>in_row_ctr, JDIMENSION in_rows_avail<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<font color='#0000FF'>#endif</font>
<font color='#009900'>/*
* Initialize for a processing pass.
*/</font>
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
<b><a name='start_pass_main'></a>start_pass_main</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, J_BUF_MODE pass_mode<font face='Lucida Console'>)</font>
<b>{</b>
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
<font color='#009900'>/* Do nothing in raw-data mode. */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>raw_data_in<font face='Lucida Console'>)</font>
<font color='#0000FF'>return</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_iMCU_row <font color='#5555FF'>=</font> <font color='#979000'>0</font>; <font color='#009900'>/* initialize counters */</font>
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended <font color='#5555FF'>=</font> FALSE;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pass_mode <font color='#5555FF'>=</font> pass_mode; <font color='#009900'>/* save mode for use by process_data */</font>
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>pass_mode<font face='Lucida Console'>)</font> <b>{</b>
<font color='#0000FF'>case</font> JBUF_PASS_THRU:
<font color='#0000FF'>#ifdef</font> FULL_MAIN_BUFFER_SUPPORTED
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<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>
<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>
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.process_data <font color='#5555FF'>=</font> process_data_simple_main;
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#ifdef</font> FULL_MAIN_BUFFER_SUPPORTED
<font color='#0000FF'>case</font> JBUF_SAVE_SOURCE:
<font color='#0000FF'>case</font> JBUF_CRANK_DEST:
<font color='#0000FF'>case</font> JBUF_SAVE_AND_PASS:
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<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>
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.process_data <font color='#5555FF'>=</font> process_data_buffer_main;
<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_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
<font color='#0000FF'>break</font>;
<b>}</b>
<b>}</b>
<font color='#009900'>/*
* Process some data.
* This routine handles the simple pass-through mode,
* where we have only a strip buffer.
*/</font>
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
<b><a name='process_data_simple_main'></a>process_data_simple_main</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo,
JSAMPARRAY input_buf, JDIMENSION <font color='#5555FF'>*</font>in_row_ctr,
JDIMENSION in_rows_avail<font face='Lucida Console'>)</font>
<b>{</b>
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
<font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_iMCU_row <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows<font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* Read input data if we haven't filled the main buffer yet */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'><</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size<font face='Lucida Console'>)</font>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>prep<font color='#5555FF'>-</font><font color='#5555FF'>></font>pre_process_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo,
input_buf, in_row_ctr, in_rows_avail,
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer, <font color='#5555FF'>&</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr,
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size<font face='Lucida Console'>)</font>;
<font color='#009900'>/* If we don't have a full iMCU row buffered, return to application for
* more data. Note that preprocessor will always pad to fill the iMCU row
* at the bottom of the image.
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size<font face='Lucida Console'>)</font>
<font color='#0000FF'>return</font>;
<font color='#009900'>/* Send the completed row to the compressor */</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>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>compress_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* If compressor did not consume the whole row, then we must need to
* suspend processing and return to the application. In this situation
* we pretend we didn't yet consume the last input row; otherwise, if
* it happened to be the last row of the image, the application would
* think we were done.
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended<font face='Lucida Console'>)</font> <b>{</b>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>in_row_ctr<font face='Lucida Console'>)</font><font color='#5555FF'>-</font><font color='#5555FF'>-</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended <font color='#5555FF'>=</font> TRUE;
<b>}</b>
<font color='#0000FF'>return</font>;
<b>}</b>
<font color='#009900'>/* We did finish the row. Undo our little suspension hack if a previous
* call suspended; then mark the main buffer empty.
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended<font face='Lucida Console'>)</font> <b>{</b>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>in_row_ctr<font face='Lucida Console'>)</font><font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended <font color='#5555FF'>=</font> FALSE;
<b>}</b>
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_iMCU_row<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
<b>}</b>
<b>}</b>
<font color='#0000FF'>#ifdef</font> FULL_MAIN_BUFFER_SUPPORTED
<font color='#009900'>/*
* Process some data.
* This routine handles all of the modes that use a full-size buffer.
*/</font>
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
<b><a name='process_data_buffer_main'></a>process_data_buffer_main</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo,
JSAMPARRAY input_buf, JDIMENSION <font color='#5555FF'>*</font>in_row_ctr,
JDIMENSION in_rows_avail<font face='Lucida Console'>)</font>
<b>{</b>
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
<font color='#0000FF'><u>int</u></font> ci;
jpeg_component_info <font color='#5555FF'>*</font>compptr;
boolean writing <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pass_mode <font color='#5555FF'>!</font><font color='#5555FF'>=</font> JBUF_CRANK_DEST<font face='Lucida Console'>)</font>;
<font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_iMCU_row <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows<font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* Realign the virtual buffers if at the start of an iMCU row. */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <b>{</b>
<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>
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>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_sarray<font face='Lucida Console'>)</font>
<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>whole_image[ci],
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_iMCU_row <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <font color='#5555FF'>*</font> DCTSIZE<font face='Lucida Console'>)</font>,
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <font color='#5555FF'>*</font> DCTSIZE<font face='Lucida Console'>)</font>, writing<font face='Lucida Console'>)</font>;
<b>}</b>
<font color='#009900'>/* In a read pass, pretend we just read some source data. */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> writing<font face='Lucida Console'>)</font> <b>{</b>
<font color='#5555FF'>*</font>in_row_ctr <font color='#5555FF'>+</font><font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>max_v_samp_factor <font color='#5555FF'>*</font> DCTSIZE;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> DCTSIZE;
<b>}</b>
<b>}</b>
<font color='#009900'>/* If a write pass, read input data until the current iMCU row is full. */</font>
<font color='#009900'>/* Note: preprocessor will pad if necessary to fill the last iMCU row. */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>writing<font face='Lucida Console'>)</font> <b>{</b>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>prep<font color='#5555FF'>-</font><font color='#5555FF'>></font>pre_process_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo,
input_buf, in_row_ctr, in_rows_avail,
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer, <font color='#5555FF'>&</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr,
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> DCTSIZE<font face='Lucida Console'>)</font>;
<font color='#009900'>/* Return to application if we need more data to fill the iMCU row. */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'><</font> DCTSIZE<font face='Lucida Console'>)</font>
<font color='#0000FF'>return</font>;
<b>}</b>
<font color='#009900'>/* Emit data, unless this is a sink-only pass. */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pass_mode <font color='#5555FF'>!</font><font color='#5555FF'>=</font> JBUF_SAVE_SOURCE<font face='Lucida Console'>)</font> <b>{</b>
<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>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>compress_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* If compressor did not consume the whole row, then we must need to
* suspend processing and return to the application. In this situation
* we pretend we didn't yet consume the last input row; otherwise, if
* it happened to be the last row of the image, the application would
* think we were done.
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended<font face='Lucida Console'>)</font> <b>{</b>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>in_row_ctr<font face='Lucida Console'>)</font><font color='#5555FF'>-</font><font color='#5555FF'>-</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended <font color='#5555FF'>=</font> TRUE;
<b>}</b>
<font color='#0000FF'>return</font>;
<b>}</b>
<font color='#009900'>/* We did finish the row. Undo our little suspension hack if a previous
* call suspended; then mark the main buffer empty.
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended<font face='Lucida Console'>)</font> <b>{</b>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>in_row_ctr<font face='Lucida Console'>)</font><font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>suspended <font color='#5555FF'>=</font> FALSE;
<b>}</b>
<b>}</b>
<font color='#009900'>/* If get here, we are done with this iMCU row. Mark buffer empty. */</font>
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>cur_iMCU_row<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
<b>}</b>
<b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* FULL_MAIN_BUFFER_SUPPORTED */</font>
<font color='#009900'>/*
* Initialize main buffer controller.
*/</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_c_main_controller'></a>jinit_c_main_controller</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, boolean need_full_buffer<font face='Lucida Console'>)</font>
<b>{</b>
my_main_ptr main;
<font color='#0000FF'><u>int</u></font> ci;
jpeg_component_info <font color='#5555FF'>*</font>compptr;
main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_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_main_controller<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> jpeg_c_main_controller <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> main;
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.start_pass <font color='#5555FF'>=</font> start_pass_main;
<font color='#009900'>/* We don't need to create a buffer in raw-data mode. */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>raw_data_in<font face='Lucida Console'>)</font>
<font color='#0000FF'>return</font>;
<font color='#009900'>/* Create the buffer. It holds downsampled data, so each component
* may be of a different size.
*/</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_MAIN_BUFFER_SUPPORTED
<font color='#009900'>/* Allocate a full-image virtual array for each component */</font>
<font color='#009900'>/* Note we pad the bottom to a multiple of the iMCU height */</font>
<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>
main<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_sarray<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,
compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>width_in_blocks <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size,
<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 color='#5555FF'>*</font> DCTSIZE,
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <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>;
<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='#0000FF'>#ifdef</font> FULL_MAIN_BUFFER_SUPPORTED
main<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>
<font color='#0000FF'>#endif</font>
<font color='#009900'>/* Allocate a strip buffer for each component */</font>
<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>
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>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>alloc_sarray<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,
compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>width_in_blocks <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size,
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <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>;
<b>}</b>
<b>}</b>
<b>}</b>
</pre></body></html>