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<html><head><title>dlib C++ Library - jcapimin.c</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>/*
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* jcapimin.c
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*
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* Copyright (C) 1994-1998, Thomas G. Lane.
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* Modified 2003-2010 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 application interface code for the compression half
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* of the JPEG library. These are the "minimum" API routines that may be
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* needed in either the normal full-compression case or the transcoding-only
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* case.
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*
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* Most of the routines intended to be called directly by an application
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* are in this file or in jcapistd.c. But also see jcparam.c for
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* parameter-setup helper routines, jcomapi.c for routines shared by
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* compression and decompression, and jctrans.c for the transcoding case.
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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'>/*
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* Initialization of a JPEG compression object.
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* The error manager must already be set up (in case memory manager fails).
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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='jpeg_CreateCompress'></a>jpeg_CreateCompress</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, <font color='#0000FF'><u>int</u></font> version, <font color='#0000FF'><u>size_t</u></font> structsize<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'><u>int</u></font> i;
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<font color='#009900'>/* Guard against version mismatches between library and caller. */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem <font color='#5555FF'>=</font> NULL; <font color='#009900'>/* so jpeg_destroy knows mem mgr not called */</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>version <font color='#5555FF'>!</font><font color='#5555FF'>=</font> JPEG_LIB_VERSION<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT2</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>structsize <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> <b><a name='jpeg_compress_struct'></a>jpeg_compress_struct</b><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT2</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_STRUCT_SIZE,
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<font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> <b><a name='jpeg_compress_struct'></a>jpeg_compress_struct</b><font face='Lucida Console'>)</font>, <font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font> structsize<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* For debugging purposes, we zero the whole master structure.
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* But the application has already set the err pointer, and may have set
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* client_data, so we have to save and restore those fields.
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* Note: if application hasn't set client_data, tools like Purify may
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* complain here.
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*/</font>
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<b>{</b>
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<font color='#0000FF'>struct</font> jpeg_error_mgr <font color='#5555FF'>*</font> err <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>err;
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<font color='#0000FF'><u>void</u></font> <font color='#5555FF'>*</font> client_data <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>client_data; <font color='#009900'>/* ignore Purify complaint here */</font>
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<font color='#BB00BB'>MEMZERO</font><font face='Lucida Console'>(</font>cinfo, <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> <b><a name='jpeg_compress_struct'></a>jpeg_compress_struct</b><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>err <font color='#5555FF'>=</font> err;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>client_data <font color='#5555FF'>=</font> client_data;
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<b>}</b>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>is_decompressor <font color='#5555FF'>=</font> FALSE;
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<font color='#009900'>/* Initialize a memory manager instance for this object */</font>
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<font color='#BB00BB'>jinit_memory_mgr</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Zero out pointers to permanent structures. */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>progress <font color='#5555FF'>=</font> NULL;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>dest <font color='#5555FF'>=</font> NULL;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info <font color='#5555FF'>=</font> NULL;
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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> NUM_QUANT_TBLS; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_ptrs[i] <font color='#5555FF'>=</font> NULL;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>q_scale_factor[i] <font color='#5555FF'>=</font> <font color='#979000'>100</font>;
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<b>}</b>
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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> NUM_HUFF_TBLS; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>dc_huff_tbl_ptrs[i] <font color='#5555FF'>=</font> NULL;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>ac_huff_tbl_ptrs[i] <font color='#5555FF'>=</font> NULL;
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<b>}</b>
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<font color='#009900'>/* Must do it here for emit_dqt in case jpeg_write_tables is used */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>block_size <font color='#5555FF'>=</font> DCTSIZE;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>natural_order <font color='#5555FF'>=</font> jpeg_natural_order;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>lim_Se <font color='#5555FF'>=</font> DCTSIZE2<font color='#5555FF'>-</font><font color='#979000'>1</font>;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>script_space <font color='#5555FF'>=</font> NULL;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>input_gamma <font color='#5555FF'>=</font> <font color='#979000'>1.0</font>; <font color='#009900'>/* in case application forgets */</font>
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<font color='#009900'>/* OK, I'm ready */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>=</font> CSTATE_START;
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<b>}</b>
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<font color='#009900'>/*
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* Destruction of a JPEG compression object
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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='jpeg_destroy_compress'></a>jpeg_destroy_compress</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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<font color='#BB00BB'>jpeg_destroy</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo<font face='Lucida Console'>)</font>; <font color='#009900'>/* use common routine */</font>
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<b>}</b>
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<font color='#009900'>/*
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* Abort processing of a JPEG compression operation,
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* but don't destroy the object itself.
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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='jpeg_abort_compress'></a>jpeg_abort_compress</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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<font color='#BB00BB'>jpeg_abort</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo<font face='Lucida Console'>)</font>; <font color='#009900'>/* use common routine */</font>
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<b>}</b>
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<font color='#009900'>/*
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* Forcibly suppress or un-suppress all quantization and Huffman tables.
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* Marks all currently defined tables as already written (if suppress)
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* or not written (if !suppress). This will control whether they get emitted
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* by a subsequent jpeg_start_compress call.
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*
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* This routine is exported for use by applications that want to produce
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* abbreviated JPEG datastreams. It logically belongs in jcparam.c, but
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* since it is called by jpeg_start_compress, we put it here --- otherwise
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* jcparam.o would be linked whether the application used it or not.
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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='jpeg_suppress_tables'></a>jpeg_suppress_tables</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, boolean suppress<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'><u>int</u></font> i;
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JQUANT_TBL <font color='#5555FF'>*</font> qtbl;
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JHUFF_TBL <font color='#5555FF'>*</font> htbl;
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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> NUM_QUANT_TBLS; i<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><font face='Lucida Console'>(</font>qtbl <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_ptrs[i]<font face='Lucida Console'>)</font> <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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qtbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>sent_table <font color='#5555FF'>=</font> suppress;
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<b>}</b>
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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> NUM_HUFF_TBLS; i<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><font face='Lucida Console'>(</font>htbl <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>dc_huff_tbl_ptrs[i]<font face='Lucida Console'>)</font> <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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htbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>sent_table <font color='#5555FF'>=</font> suppress;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>htbl <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>ac_huff_tbl_ptrs[i]<font face='Lucida Console'>)</font> <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
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htbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>sent_table <font color='#5555FF'>=</font> suppress;
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<b>}</b>
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<b>}</b>
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<font color='#009900'>/*
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* Finish JPEG compression.
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*
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* If a multipass operating mode was selected, this may do a great deal of
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* work including most of the actual output.
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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='jpeg_finish_compress'></a>jpeg_finish_compress</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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JDIMENSION iMCU_row;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>=</font><font color='#5555FF'>=</font> CSTATE_SCANNING <font color='#5555FF'>|</font><font color='#5555FF'>|</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>=</font><font color='#5555FF'>=</font> CSTATE_RAW_OK<font face='Lucida Console'>)</font> <b>{</b>
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<font color='#009900'>/* Terminate first pass */</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>next_scanline <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>image_height<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_TOO_LITTLE_DATA<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>master<font color='#5555FF'>-</font><font color='#5555FF'>></font>finish_pass<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<b>}</b> <font color='#0000FF'>else</font> <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_WRCOEFS<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT1</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_STATE, cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Perform any remaining passes */</font>
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<font color='#0000FF'>while</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>master<font color='#5555FF'>-</font><font color='#5555FF'>></font>is_last_pass<font face='Lucida Console'>)</font> <b>{</b>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>master<font color='#5555FF'>-</font><font color='#5555FF'>></font>prepare_for_pass<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>iMCU_row <font color='#5555FF'>=</font> <font color='#979000'>0</font>; iMCU_row <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows; iMCU_row<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>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>progress <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>progress<font color='#5555FF'>-</font><font color='#5555FF'>></font>pass_counter <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> iMCU_row;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>progress<font color='#5555FF'>-</font><font color='#5555FF'>></font>pass_limit <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows;
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>progress<font color='#5555FF'>-</font><font color='#5555FF'>></font>progress_monitor<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font color='#009900'>/* We bypass the main controller and invoke coef controller directly;
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* all work is being done from the coefficient buffer.
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*/</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>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>compress_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, <font face='Lucida Console'>(</font>JSAMPIMAGE<font face='Lucida Console'>)</font> NULL<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_CANT_SUSPEND<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>master<font color='#5555FF'>-</font><font color='#5555FF'>></font>finish_pass<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font color='#009900'>/* Write EOI, do final cleanup */</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>marker<font color='#5555FF'>-</font><font color='#5555FF'>></font>write_file_trailer<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<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>dest<font color='#5555FF'>-</font><font color='#5555FF'>></font>term_destination<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* We can use jpeg_abort to release memory and reset global_state */</font>
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<font color='#BB00BB'>jpeg_abort</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font color='#009900'>/*
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* Write a special marker.
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* This is only recommended for writing COM or APPn markers.
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* Must be called after jpeg_start_compress() and before
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* first call to jpeg_write_scanlines() or jpeg_write_raw_data().
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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='jpeg_write_marker'></a>jpeg_write_marker</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, <font color='#0000FF'><u>int</u></font> marker,
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<font color='#0000FF'>const</font> JOCTET <font color='#5555FF'>*</font>dataptr, <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>int</u></font> datalen<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#BB00BB'>JMETHOD</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font>, write_marker_byte, <font face='Lucida Console'>(</font>j_compress_ptr info, <font color='#0000FF'><u>int</u></font> val<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>next_scanline <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>0</font> <font color='#5555FF'>|</font><font color='#5555FF'>|</font>
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<font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_SCANNING <font color='#5555FF'>&</font><font color='#5555FF'>&</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_RAW_OK <font color='#5555FF'>&</font><font color='#5555FF'>&</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_WRCOEFS<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT1</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_STATE, cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state<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>marker<font color='#5555FF'>-</font><font color='#5555FF'>></font>write_marker_header<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, marker, datalen<font face='Lucida Console'>)</font>;
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write_marker_byte <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>marker<font color='#5555FF'>-</font><font color='#5555FF'>></font>write_marker_byte; <font color='#009900'>/* copy for speed */</font>
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<font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>datalen<font color='#5555FF'>-</font><font color='#5555FF'>-</font><font face='Lucida Console'>)</font> <b>{</b>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>write_marker_byte<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, <font color='#5555FF'>*</font>dataptr<font face='Lucida Console'>)</font>;
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dataptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
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<b>}</b>
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<b>}</b>
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<font color='#009900'>/* Same, but piecemeal. */</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='jpeg_write_m_header'></a>jpeg_write_m_header</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, <font color='#0000FF'><u>int</u></font> marker, <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>int</u></font> datalen<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>next_scanline <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>0</font> <font color='#5555FF'>|</font><font color='#5555FF'>|</font>
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<font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_SCANNING <font color='#5555FF'>&</font><font color='#5555FF'>&</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_RAW_OK <font color='#5555FF'>&</font><font color='#5555FF'>&</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_WRCOEFS<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT1</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_STATE, cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state<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>marker<font color='#5555FF'>-</font><font color='#5555FF'>></font>write_marker_header<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, marker, datalen<font face='Lucida Console'>)</font>;
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<b>}</b>
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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='jpeg_write_m_byte'></a>jpeg_write_m_byte</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, <font color='#0000FF'><u>int</u></font> val<font face='Lucida Console'>)</font>
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<b>{</b>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>marker<font color='#5555FF'>-</font><font color='#5555FF'>></font>write_marker_byte<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, val<font face='Lucida Console'>)</font>;
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<b>}</b>
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<font color='#009900'>/*
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* Alternate compression function: just write an abbreviated table file.
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* Before calling this, all parameters and a data destination must be set up.
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*
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* To produce a pair of files containing abbreviated tables and abbreviated
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* image data, one would proceed as follows:
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*
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* initialize JPEG object
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* set JPEG parameters
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* set destination to table file
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* jpeg_write_tables(cinfo);
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* set destination to image file
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* jpeg_start_compress(cinfo, FALSE);
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* write data...
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* jpeg_finish_compress(cinfo);
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*
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* jpeg_write_tables has the side effect of marking all tables written
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* (same as jpeg_suppress_tables(..., TRUE)). Thus a subsequent start_compress
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* will not re-emit the tables unless it is passed write_all_tables=TRUE.
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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='jpeg_write_tables'></a>jpeg_write_tables</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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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state <font color='#5555FF'>!</font><font color='#5555FF'>=</font> CSTATE_START<font face='Lucida Console'>)</font>
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<font color='#BB00BB'>ERREXIT1</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_STATE, cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>global_state<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* (Re)initialize error mgr and destination modules */</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>err<font color='#5555FF'>-</font><font color='#5555FF'>></font>reset_error_mgr<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo<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>dest<font color='#5555FF'>-</font><font color='#5555FF'>></font>init_destination<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Initialize the marker writer ... bit of a crock to do it here. */</font>
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<font color='#BB00BB'>jinit_marker_writer</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Write them tables! */</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>marker<font color='#5555FF'>-</font><font color='#5555FF'>></font>write_tables_only<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* And clean up. */</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>dest<font color='#5555FF'>-</font><font color='#5555FF'>></font>term_destination<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#009900'>/*
|
|
* In library releases up through v6a, we called jpeg_abort() here to free
|
|
* any working memory allocated by the destination manager and marker
|
|
* writer. Some applications had a problem with that: they allocated space
|
|
* of their own from the library memory manager, and didn't want it to go
|
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* away during write_tables. So now we do nothing. This will cause a
|
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* memory leak if an app calls write_tables repeatedly without doing a full
|
|
* compression cycle or otherwise resetting the JPEG object. However, that
|
|
* seems less bad than unexpectedly freeing memory in the normal case.
|
|
* An app that prefers the old behavior can call jpeg_abort for itself after
|
|
* each call to jpeg_write_tables().
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*/</font>
|
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<b>}</b>
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</pre></body></html> |
