ft2-system_interface.html

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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>FreeType-2.1.10 API Reference</title><style type="text/css">  body { font-family: Verdana, Geneva, Arial, Helvetica, serif;         color: #000000;         background: #FFFFFF; }  p { text-align: justify; }  h1 { text-align: center; }  li { text-align: justify; }  a:link { color: #0000EF; }  a:visited { color: #51188E; }  a:hover { color: #FF0000; }  span.keyword { font-family: monospace;                 text-align: left;                 white-space: pre;                 color: darkblue; }  pre.colored { color: blue; }  ul.empty { list-style-type: none; }</style></head><body><center><h1>FreeType-2.1.10 API Reference</h1></center><center><h1>System Interface</h1></center><h2>Synopsis</h2><table align=center cellspacing=5 cellpadding=0 border=0><tr><td></td><td><a href="#FT_Memory">FT_Memory</a></td><td></td><td><a href="#FT_MemoryRec">FT_MemoryRec</a></td><td></td><td><a href="#FT_Stream_CloseFunc">FT_Stream_CloseFunc</a></td></tr><tr><td></td><td><a href="#FT_Alloc_Func">FT_Alloc_Func</a></td><td></td><td><a href="#FT_Stream">FT_Stream</a></td><td></td><td><a href="#FT_StreamRec">FT_StreamRec</a></td></tr><tr><td></td><td><a href="#FT_Free_Func">FT_Free_Func</a></td><td></td><td><a href="#FT_StreamDesc">FT_StreamDesc</a></td><td></td><td></td></tr><tr><td></td><td><a href="#FT_Realloc_Func">FT_Realloc_Func</a></td><td></td><td><a href="#FT_Stream_IoFunc">FT_Stream_IoFunc</a></td><td></td><td></td></tr></table><br><br><table align=center width="87%"><tr><td><p>This section contains various definitions related to memory management and i/o access. You need to understand this information if you want to use a custom memory manager or you own input i/o streams.</p></td></tr></table><br><table align=center width="75%"><tr><td><h4><a name="FT_Memory">FT_Memory</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_MemoryRec_*  <b>FT_Memory</b>;</pre></table><br><table align=center width="87%"><tr><td><p>A handle to a given memory manager object, defined with a <a href="ft2-system_interface.html#FT_MemoryRec">FT_MemoryRec</a> structure.</p></td></tr></table><br></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Alloc_Func">FT_Alloc_Func</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">void</span>*  (*<b>FT_Alloc_Func</b>)( <a href="ft2-system_interface.html#FT_Memory">FT_Memory</a>  memory,                    <span class="keyword">long</span>       size );</pre></table><br><table align=center width="87%"><tr><td><p>A function used to allocate `size' bytes from `memory'.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>memory</b></td><td><p>A handle to the source memory manager.</p></td></tr><tr valign=top><td><b>size</b></td><td><p>The size in bytes to allocate.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>Address of new memory block. 0 in case of failure.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Free_Func">FT_Free_Func</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">void</span>  (*<b>FT_Free_Func</b>)( <a href="ft2-system_interface.html#FT_Memory">FT_Memory</a>  memory,                   <span class="keyword">void</span>*      block );</pre></table><br><table align=center width="87%"><tr><td><p>A function used to release a given block of memory.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>memory</b></td><td><p>A handle to the source memory manager.</p></td></tr><tr valign=top><td><b>block</b></td><td><p>The address of the target memory block.</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Realloc_Func">FT_Realloc_Func</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">void</span>*  (*<b>FT_Realloc_Func</b>)( <a href="ft2-system_interface.html#FT_Memory">FT_Memory</a>  memory,                      <span class="keyword">long</span>       cur_size,                      <span class="keyword">long</span>       new_size,                      <span class="keyword">void</span>*      block );</pre></table><br><table align=center width="87%"><tr><td><p>a function used to re-allocate a given block of memory.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>memory</b></td><td><p>A handle to the source memory manager.</p></td></tr><tr valign=top><td><b>cur_size</b></td><td><p>The block's current size in bytes.</p></td></tr><tr valign=top><td><b>new_size</b></td><td><p>The block's requested new size.</p></td></tr><tr valign=top><td><b>block</b></td><td><p>The block's current address.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>New block address. 0 in case of memory shortage.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>In case of error, the old block must still be available.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_MemoryRec">FT_MemoryRec</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">struct</span>  FT_MemoryRec_  {    <span class="keyword">void</span>*            user;    <a href="ft2-system_interface.html#FT_Alloc_Func">FT_Alloc_Func</a>    alloc;    <a href="ft2-system_interface.html#FT_Free_Func">FT_Free_Func</a>     free;    <a href="ft2-system_interface.html#FT_Realloc_Func">FT_Realloc_Func</a>  realloc;  };</pre></table><br><table align=center width="87%"><tr><td><p>A structure used to describe a given memory manager to FreeType 2.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>fields</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>user</b></td><td><p>A generic typeless pointer for user data.</p></td></tr><tr valign=top><td><b>alloc</b></td><td><p>A pointer type to an allocation function.</p></td></tr><tr valign=top><td><b>free</b></td><td><p>A pointer type to an memory freeing function.</p></td></tr><tr valign=top><td><b>realloc</b></td><td><p>A pointer type to a reallocation function.</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Stream">FT_Stream</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_StreamRec_*  <b>FT_Stream</b>;</pre></table><br><table align=center width="87%"><tr><td><p>A handle to an input stream.</p></td></tr></table><br></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_StreamDesc">FT_StreamDesc</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">union</span>  FT_StreamDesc_  {    <span class="keyword">long</span>   value;    <span class="keyword">void</span>*  pointer;  } <b>FT_StreamDesc</b>;</pre></table><br><table align=center width="87%"><tr><td><p>A union type used to store either a long or a pointer. This is used to store a file descriptor or a FILE* in an input stream.</p></td></tr></table><br></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Stream_IoFunc">FT_Stream_IoFunc</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">long</span>  (*<b>FT_Stream_IoFunc</b>)( <a href="ft2-system_interface.html#FT_Stream">FT_Stream</a>       stream,                       <span class="keyword">unsigned</span> <span class="keyword">long</span>   offset,                       <span class="keyword">unsigned</span> <span class="keyword">char</span>*  buffer,                       <span class="keyword">unsigned</span> <span class="keyword">long</span>   count );</pre></table><br><table align=center width="87%"><tr><td><p>A function used to seek and read data from a given input stream.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>stream</b></td><td><p>A handle to the source stream.</p></td></tr><tr valign=top><td><b>offset</b></td><td><p>The offset of read in stream (always from start).</p></td></tr><tr valign=top><td><b>buffer</b></td><td><p>The address of the read buffer.</p></td></tr><tr valign=top><td><b>count</b></td><td><p>The number of bytes to read from the stream.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>The number of bytes effectively read by the stream.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>This function might be called to perform a seek or skip operation with a `count' of 0.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Stream_CloseFunc">FT_Stream_CloseFunc</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">void</span>  (*<b>FT_Stream_CloseFunc</b>)( <a href="ft2-system_interface.html#FT_Stream">FT_Stream</a>  stream );</pre></table><br><table align=center width="87%"><tr><td><p>A function used to close a given input stream.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>stream</b></td><td><p>A handle to the target stream.</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_StreamRec">FT_StreamRec</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  <span class="keyword">typedef</span> <span class="keyword">struct</span>  FT_StreamRec_  {    <span class="keyword">unsigned</span> <span class="keyword">char</span>*       base;    <span class="keyword">unsigned</span> <span class="keyword">long</span>        size;    <span class="keyword">unsigned</span> <span class="keyword">long</span>        pos;    <a href="ft2-system_interface.html#FT_StreamDesc">FT_StreamDesc</a>        descriptor;    <a href="ft2-system_interface.html#FT_StreamDesc">FT_StreamDesc</a>        pathname;    <a href="ft2-system_interface.html#FT_Stream_IoFunc">FT_Stream_IoFunc</a>     read;    <a href="ft2-system_interface.html#FT_Stream_CloseFunc">FT_Stream_CloseFunc</a>  close;    <a href="ft2-system_interface.html#FT_Memory">FT_Memory</a>            memory;    <span class="keyword">unsigned</span> <span class="keyword">char</span>*       cursor;    <span class="keyword">unsigned</span> <span class="keyword">char</span>*       limit;  } <b>FT_StreamRec</b>;</pre></table><br><table align=center width="87%"><tr><td><p>A structure used to describe an input stream.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>base</b></td><td><p>For memory-based streams, this is the address of the first stream byte in memory. This field should always be set to NULL for disk-based streams.</p></td></tr><tr valign=top><td><b>size</b></td><td><p>The stream size in bytes.</p></td></tr><tr valign=top><td><b>pos</b></td><td><p>The current position within the stream.</p></td></tr><tr valign=top><td><b>descriptor</b></td><td><p>This field is a union that can hold an integer or a pointer. It is used by stream implementations to store file descriptors or FILE* pointers.</p></td></tr><tr valign=top><td><b>pathname</b></td><td><p>This field is completely ignored by FreeType. However, it is often useful during debugging to use it to store the stream's filename (where available).</p></td></tr><tr valign=top><td><b>read</b></td><td><p>The stream's input function.</p></td></tr><tr valign=top><td><b>close</b></td><td><p>The stream;s close function.</p></td></tr><tr valign=top><td><b>memory</b></td><td><p>The memory manager to use to preload frames. This is set internally by FreeType and shouldn't be touched by stream implementations.</p></td></tr><tr valign=top><td><b>cursor</b></td><td><p>This field is set and used internally by FreeType when parsing frames.</p></td></tr><tr valign=top><td><b>limit</b></td><td><p>This field is set and used internally by FreeType when parsing frames.</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"></body></html>

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