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<html><!-- Created using the cpp_pretty_printer from the dlib C++ library.  See http://dlib.net for updates. --><head><title>dlib C++ Library - jpeg_loader.cpp</title></head><body bgcolor='white'><pre>
<font color='#009900'>// Copyright (C) 2010  Davis E. King ([email protected]), Nils Labugt
</font><font color='#009900'>// License: Boost Software License   See LICENSE.txt for the full license.
</font><font color='#0000FF'>#ifndef</font> DLIB_JPEG_LOADER_CPp_
<font color='#0000FF'>#define</font> DLIB_JPEG_LOADER_CPp_

<font color='#009900'>// only do anything with this file if DLIB_JPEG_SUPPORT is defined
</font><font color='#0000FF'>#ifdef</font> DLIB_JPEG_SUPPORT

<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../array2d.h.html'>../array2d.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../pixel.h.html'>../pixel.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../dir_nav.h.html'>../dir_nav.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jpeg_loader.h.html'>jpeg_loader.h</a>"
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>stdio.h<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#ifdef</font> DLIB_JPEG_STATIC
#   include "<font color='#CC0000'>../external/libjpeg/jpeglib.h</font>"
<font color='#0000FF'>#else</font>
#   include <font color='#5555FF'>&lt;</font>jpeglib.h<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>sstream<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>setjmp.h<font color='#5555FF'>&gt;</font>

<font color='#0000FF'>namespace</font> dlib
<b>{</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    jpeg_loader::
    <b><a name='jpeg_loader'></a>jpeg_loader</b><font face='Lucida Console'>(</font> <font color='#0000FF'>const</font> <font color='#0000FF'><u>char</u></font><font color='#5555FF'>*</font> filename <font face='Lucida Console'>)</font> : height_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, width_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, output_components_<font face='Lucida Console'>(</font><font color='#979000'>0</font><font face='Lucida Console'>)</font>
    <b>{</b>
        <font color='#BB00BB'>read_image</font><font face='Lucida Console'>(</font> <font color='#BB00BB'>check_file</font><font face='Lucida Console'>(</font> filename <font face='Lucida Console'>)</font>, NULL, <font color='#979000'>0</font>L <font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    jpeg_loader::
    <b><a name='jpeg_loader'></a>jpeg_loader</b><font face='Lucida Console'>(</font> <font color='#0000FF'>const</font> std::string<font color='#5555FF'>&amp;</font> filename <font face='Lucida Console'>)</font> : height_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, width_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, output_components_<font face='Lucida Console'>(</font><font color='#979000'>0</font><font face='Lucida Console'>)</font>
    <b>{</b>
        <font color='#BB00BB'>read_image</font><font face='Lucida Console'>(</font> <font color='#BB00BB'>check_file</font><font face='Lucida Console'>(</font> filename.<font color='#BB00BB'>c_str</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font face='Lucida Console'>)</font>, NULL, <font color='#979000'>0</font>L <font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    jpeg_loader::
    <b><a name='jpeg_loader'></a>jpeg_loader</b><font face='Lucida Console'>(</font> <font color='#0000FF'>const</font> dlib::file<font color='#5555FF'>&amp;</font> f <font face='Lucida Console'>)</font> : height_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, width_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, output_components_<font face='Lucida Console'>(</font><font color='#979000'>0</font><font face='Lucida Console'>)</font>
    <b>{</b>
        <font color='#BB00BB'>read_image</font><font face='Lucida Console'>(</font> <font color='#BB00BB'>check_file</font><font face='Lucida Console'>(</font> f.<font color='#BB00BB'>full_name</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>.<font color='#BB00BB'>c_str</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font face='Lucida Console'>)</font>, NULL, <font color='#979000'>0</font>L <font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>    
    jpeg_loader::
    <b><a name='jpeg_loader'></a>jpeg_loader</b><font face='Lucida Console'>(</font> <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font><font color='#5555FF'>*</font> imgbuffer, <font color='#0000FF'><u>size_t</u></font> imgbuffersize <font face='Lucida Console'>)</font> : height_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, width_<font face='Lucida Console'>(</font> <font color='#979000'>0</font> <font face='Lucida Console'>)</font>, output_components_<font face='Lucida Console'>(</font><font color='#979000'>0</font><font face='Lucida Console'>)</font>
    <b>{</b>
        <font color='#BB00BB'>read_image</font><font face='Lucida Console'>(</font> NULL, imgbuffer, imgbuffersize <font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'><u>bool</u></font> jpeg_loader::<b><a name='is_gray'></a>is_gray</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>
    <b>{</b>
        <font color='#0000FF'>return</font> <font face='Lucida Console'>(</font>output_components_ <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'><u>bool</u></font> jpeg_loader::<b><a name='is_rgb'></a>is_rgb</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>
    <b>{</b>
        <font color='#0000FF'>return</font> <font face='Lucida Console'>(</font>output_components_ <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'><u>bool</u></font> jpeg_loader::<b><a name='is_rgba'></a>is_rgba</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>
    <b>{</b>
        <font color='#0000FF'>return</font> <font face='Lucida Console'>(</font>output_components_ <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'>struct</font> <b><a name='jpeg_loader_error_mgr'></a>jpeg_loader_error_mgr</b> 
    <b>{</b>
        jpeg_error_mgr pub;    <font color='#009900'>/* "public" fields */</font>
        jmp_buf setjmp_buffer;  <font color='#009900'>/* for return to caller */</font>
        <font color='#0000FF'><u>char</u></font> jpegLastErrorMsg[JMSG_LENGTH_MAX];
    <b>}</b>;

    <font color='#0000FF'><u>void</u></font> <b><a name='jpeg_loader_error_exit'></a>jpeg_loader_error_exit</b> <font face='Lucida Console'>(</font>j_common_ptr cinfo<font face='Lucida Console'>)</font>
    <b>{</b>
        <font color='#009900'>/* cinfo-&gt;err really points to a jpeg_loader_error_mgr struct, so coerce pointer */</font>
        jpeg_loader_error_mgr<font color='#5555FF'>*</font> myerr <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>jpeg_loader_error_mgr<font color='#5555FF'>*</font><font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>err;
        
        <font color='#009900'>/* Create the message */</font>
        <font face='Lucida Console'>(</font> <font color='#5555FF'>*</font><font face='Lucida Console'>(</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>err<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>format_message <font face='Lucida Console'>)</font> <font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font> cinfo, myerr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>jpegLastErrorMsg <font face='Lucida Console'>)</font>;

        <font color='#009900'>/* Return control to the setjmp point */</font>
        <font color='#BB00BB'>longjmp</font><font face='Lucida Console'>(</font>myerr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>setjmp_buffer, <font color='#979000'>1</font><font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>    FILE <font color='#5555FF'>*</font> jpeg_loader::<b><a name='check_file'></a>check_file</b><font face='Lucida Console'>(</font> <font color='#0000FF'>const</font> <font color='#0000FF'><u>char</u></font><font color='#5555FF'>*</font> filename <font face='Lucida Console'>)</font>
    <b>{</b>
      <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font> filename <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL <font face='Lucida Console'>)</font>
      <b>{</b>
          <font color='#0000FF'>throw</font> <font color='#BB00BB'>image_load_error</font><font face='Lucida Console'>(</font>"<font color='#CC0000'>jpeg_loader: invalid filename, it is NULL</font>"<font face='Lucida Console'>)</font>;
      <b>}</b>
      FILE <font color='#5555FF'>*</font>fp <font color='#5555FF'>=</font> <font color='#BB00BB'>fopen</font><font face='Lucida Console'>(</font> filename, "<font color='#CC0000'>rb</font>" <font face='Lucida Console'>)</font>;
      <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font> <font color='#5555FF'>!</font>fp <font face='Lucida Console'>)</font>
      <b>{</b>
          <font color='#0000FF'>throw</font> <font color='#BB00BB'>image_load_error</font><font face='Lucida Console'>(</font>std::<font color='#BB00BB'>string</font><font face='Lucida Console'>(</font>"<font color='#CC0000'>jpeg_loader: unable to open file </font>"<font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> filename<font face='Lucida Console'>)</font>;
      <b>}</b>
      <font color='#0000FF'>return</font> fp;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'><u>void</u></font> jpeg_loader::<b><a name='read_image'></a>read_image</b><font face='Lucida Console'>(</font> FILE <font color='#5555FF'>*</font> file, <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font><font color='#5555FF'>*</font> imgbuffer, <font color='#0000FF'><u>size_t</u></font> imgbuffersize <font face='Lucida Console'>)</font>
    <b>{</b>
        
        jpeg_decompress_struct cinfo;
        jpeg_loader_error_mgr jerr;

        cinfo.err <font color='#5555FF'>=</font> <font color='#BB00BB'>jpeg_std_error</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>jerr.pub<font face='Lucida Console'>)</font>;

        jerr.pub.error_exit <font color='#5555FF'>=</font> jpeg_loader_error_exit;

        <font color='#009900'>/* Establish the setjmp return context for my_error_exit to use. */</font>
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#BB00BB'>setjmp</font><font face='Lucida Console'>(</font>jerr.setjmp_buffer<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> 
        <b>{</b>
            <font color='#009900'>/* If we get here, the JPEG code has signaled an error.
             * We need to clean up the JPEG object, and return.
             */</font>
            <font color='#BB00BB'>jpeg_destroy_decompress</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo<font face='Lucida Console'>)</font>;
            <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>file <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <font color='#BB00BB'>fclose</font><font face='Lucida Console'>(</font>file<font face='Lucida Console'>)</font>;
            <font color='#0000FF'>throw</font> <font color='#BB00BB'>image_load_error</font><font face='Lucida Console'>(</font>std::<font color='#BB00BB'>string</font><font face='Lucida Console'>(</font>"<font color='#CC0000'>jpeg_loader: error while loading image: </font>"<font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> jerr.jpegLastErrorMsg<font face='Lucida Console'>)</font>;
        <b>}</b>


        <font color='#BB00BB'>jpeg_create_decompress</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo<font face='Lucida Console'>)</font>;
        
        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>file <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <font color='#BB00BB'>jpeg_stdio_src</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo, file<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>else</font> <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>imgbuffer <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <font color='#BB00BB'>jpeg_mem_src</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo, <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font><font color='#5555FF'>*</font><font face='Lucida Console'>)</font>imgbuffer, imgbuffersize<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>else</font> <font color='#0000FF'>throw</font> <font color='#BB00BB'>image_load_error</font><font face='Lucida Console'>(</font>std::<font color='#BB00BB'>string</font><font face='Lucida Console'>(</font>"<font color='#CC0000'>jpeg_loader: no valid image source</font>"<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;

        <font color='#BB00BB'>jpeg_read_header</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo, TRUE<font face='Lucida Console'>)</font>;

        <font color='#BB00BB'>jpeg_start_decompress</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo<font face='Lucida Console'>)</font>;

        height_ <font color='#5555FF'>=</font> cinfo.output_height;
        width_ <font color='#5555FF'>=</font> cinfo.output_width;
        output_components_ <font color='#5555FF'>=</font> cinfo.output_components;

        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>output_components_ <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>1</font> <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font> 
            output_components_ <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>3</font> <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font>
            output_components_ <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>
        <b>{</b>
            <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>file <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <font color='#BB00BB'>fclose</font><font face='Lucida Console'>(</font>file<font face='Lucida Console'>)</font>;
            <font color='#BB00BB'>jpeg_destroy_decompress</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo<font face='Lucida Console'>)</font>;
            std::ostringstream sout;
            sout <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> "<font color='#CC0000'>jpeg_loader: Unsupported number of colors (</font>" <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> output_components_ <font color='#5555FF'>&lt;</font><font color='#5555FF'>&lt;</font> "<font color='#CC0000'>) in image</font>";
            <font color='#0000FF'>throw</font> <font color='#BB00BB'>image_load_error</font><font face='Lucida Console'>(</font>sout.<font color='#BB00BB'>str</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
        <b>}</b>

        std::vector<font color='#5555FF'>&lt;</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font><font color='#5555FF'>*</font><font color='#5555FF'>&gt;</font> rows;
        rows.<font color='#BB00BB'>resize</font><font face='Lucida Console'>(</font>height_<font face='Lucida Console'>)</font>;

        <font color='#009900'>// size the image buffer
</font>        data.<font color='#BB00BB'>resize</font><font face='Lucida Console'>(</font>height_<font color='#5555FF'>*</font>width_<font color='#5555FF'>*</font>output_components_<font face='Lucida Console'>)</font>;

        <font color='#009900'>// setup pointers to each row
</font>        <font color='#0000FF'>for</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'>&lt;</font> rows.<font color='#BB00BB'>size</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>; <font color='#5555FF'>+</font><font color='#5555FF'>+</font>i<font face='Lucida Console'>)</font>
            rows[i] <font color='#5555FF'>=</font> <font color='#5555FF'>&amp;</font>data[i<font color='#5555FF'>*</font>width_<font color='#5555FF'>*</font>output_components_];

        <font color='#009900'>// read the data into the buffer
</font>        <font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>cinfo.output_scanline <font color='#5555FF'>&lt;</font> cinfo.output_height<font face='Lucida Console'>)</font>
        <b>{</b>
            <font color='#BB00BB'>jpeg_read_scanlines</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo, <font color='#5555FF'>&amp;</font>rows[cinfo.output_scanline], <font color='#979000'>100</font><font face='Lucida Console'>)</font>;
        <b>}</b>

        <font color='#BB00BB'>jpeg_finish_decompress</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo<font face='Lucida Console'>)</font>;
        <font color='#BB00BB'>jpeg_destroy_decompress</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>cinfo<font face='Lucida Console'>)</font>;

        <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>file <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <font color='#BB00BB'>fclose</font><font face='Lucida Console'>(</font>file<font face='Lucida Console'>)</font>;
    <b>}</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<b>}</b>

<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_JPEG_SUPPORT
</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_JPEG_LOADER_CPp_
</font>


</pre></body></html>