ref: 55b0908ef5779f16d08ad4a60eee10a3d36bc2e6
dir: /src/base/ftutil.c/
/***************************************************************************/
/* */
/* ftutil.c */
/* */
/* FreeType utility file for memory and list management (body). */
/* */
/* Copyright 2002, 2004, 2005 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_MEMORY_H
#include FT_INTERNAL_OBJECTS_H
#include FT_LIST_H
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_memory
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** *****/
/***** M E M O R Y M A N A G E M E N T *****/
/***** *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* documentation is in ftmemory.h */
FT_BASE_DEF( FT_Error )
FT_Alloc( FT_Memory memory,
FT_Long size,
void* *P )
{
FT_ASSERT( P != 0 );
if ( size > 0 )
{
*P = memory->alloc( memory, size );
if ( !*P )
{
FT_ERROR(( "FT_Alloc:" ));
FT_ERROR(( " Out of memory? (%ld requested)\n",
size ));
return FT_Err_Out_Of_Memory;
}
FT_MEM_ZERO( *P, size );
}
else
*P = NULL;
FT_TRACE7(( "FT_Alloc:" ));
FT_TRACE7(( " size = %ld, block = 0x%08p, ref = 0x%08p\n",
size, *P, P ));
return FT_Err_Ok;
}
/* documentation is in ftmemory.h */
FT_BASE_DEF( FT_Error )
FT_QAlloc( FT_Memory memory,
FT_Long size,
void* *P )
{
FT_ASSERT( P != 0 );
if ( size > 0 )
{
*P = memory->alloc( memory, size );
if ( !*P )
{
FT_ERROR(( "FT_QAlloc:" ));
FT_ERROR(( " Out of memory? (%ld requested)\n",
size ));
return FT_Err_Out_Of_Memory;
}
}
else
*P = NULL;
FT_TRACE7(( "FT_QAlloc:" ));
FT_TRACE7(( " size = %ld, block = 0x%08p, ref = 0x%08p\n",
size, *P, P ));
return FT_Err_Ok;
}
/* documentation is in ftmemory.h */
FT_BASE_DEF( FT_Error )
FT_Realloc( FT_Memory memory,
FT_Long current,
FT_Long size,
void** P )
{
void* Q;
FT_ASSERT( P != 0 );
/* if the original pointer is NULL, call FT_Alloc() */
if ( !*P )
return FT_Alloc( memory, size, P );
/* if the new block if zero-sized, clear the current one */
if ( size <= 0 )
{
FT_Free( memory, P );
return FT_Err_Ok;
}
Q = memory->realloc( memory, current, size, *P );
if ( !Q )
goto Fail;
if ( size > current )
FT_MEM_ZERO( (char*)Q + current, size - current );
*P = Q;
return FT_Err_Ok;
Fail:
FT_ERROR(( "FT_Realloc:" ));
FT_ERROR(( " Failed (current %ld, requested %ld)\n",
current, size ));
return FT_Err_Out_Of_Memory;
}
/* documentation is in ftmemory.h */
FT_BASE_DEF( FT_Error )
FT_QRealloc( FT_Memory memory,
FT_Long current,
FT_Long size,
void** P )
{
void* Q;
FT_ASSERT( P != 0 );
/* if the original pointer is NULL, call FT_QAlloc() */
if ( !*P )
return FT_QAlloc( memory, size, P );
/* if the new block if zero-sized, clear the current one */
if ( size <= 0 )
{
FT_Free( memory, P );
return FT_Err_Ok;
}
Q = memory->realloc( memory, current, size, *P );
if ( !Q )
goto Fail;
*P = Q;
return FT_Err_Ok;
Fail:
FT_ERROR(( "FT_QRealloc:" ));
FT_ERROR(( " Failed (current %ld, requested %ld)\n",
current, size ));
return FT_Err_Out_Of_Memory;
}
/* documentation is in ftmemory.h */
FT_BASE_DEF( void )
FT_Free( FT_Memory memory,
void** P )
{
FT_TRACE7(( "FT_Free:" ));
FT_TRACE7(( " Freeing block 0x%08p, ref 0x%08p\n",
P, P ? *P : (void*)0 ));
if ( P && *P )
{
memory->free( memory, *P );
*P = 0;
}
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** *****/
/***** D O U B L Y L I N K E D L I S T S *****/
/***** *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#undef FT_COMPONENT
#define FT_COMPONENT trace_list
/* documentation is in ftlist.h */
FT_EXPORT_DEF( FT_ListNode )
FT_List_Find( FT_List list,
void* data )
{
FT_ListNode cur;
cur = list->head;
while ( cur )
{
if ( cur->data == data )
return cur;
cur = cur->next;
}
return (FT_ListNode)0;
}
/* documentation is in ftlist.h */
FT_EXPORT_DEF( void )
FT_List_Add( FT_List list,
FT_ListNode node )
{
FT_ListNode before = list->tail;
node->next = 0;
node->prev = before;
if ( before )
before->next = node;
else
list->head = node;
list->tail = node;
}
/* documentation is in ftlist.h */
FT_EXPORT_DEF( void )
FT_List_Insert( FT_List list,
FT_ListNode node )
{
FT_ListNode after = list->head;
node->next = after;
node->prev = 0;
if ( !after )
list->tail = node;
else
after->prev = node;
list->head = node;
}
/* documentation is in ftlist.h */
FT_EXPORT_DEF( void )
FT_List_Remove( FT_List list,
FT_ListNode node )
{
FT_ListNode before, after;
before = node->prev;
after = node->next;
if ( before )
before->next = after;
else
list->head = after;
if ( after )
after->prev = before;
else
list->tail = before;
}
/* documentation is in ftlist.h */
FT_EXPORT_DEF( void )
FT_List_Up( FT_List list,
FT_ListNode node )
{
FT_ListNode before, after;
before = node->prev;
after = node->next;
/* check whether we are already on top of the list */
if ( !before )
return;
before->next = after;
if ( after )
after->prev = before;
else
list->tail = before;
node->prev = 0;
node->next = list->head;
list->head->prev = node;
list->head = node;
}
/* documentation is in ftlist.h */
FT_EXPORT_DEF( FT_Error )
FT_List_Iterate( FT_List list,
FT_List_Iterator iterator,
void* user )
{
FT_ListNode cur = list->head;
FT_Error error = FT_Err_Ok;
while ( cur )
{
FT_ListNode next = cur->next;
error = iterator( cur, user );
if ( error )
break;
cur = next;
}
return error;
}
/* documentation is in ftlist.h */
FT_EXPORT_DEF( void )
FT_List_Finalize( FT_List list,
FT_List_Destructor destroy,
FT_Memory memory,
void* user )
{
FT_ListNode cur;
cur = list->head;
while ( cur )
{
FT_ListNode next = cur->next;
void* data = cur->data;
if ( destroy )
destroy( memory, data, user );
FT_FREE( cur );
cur = next;
}
list->head = 0;
list->tail = 0;
}
FT_BASE( FT_UInt32 )
ft_highpow2( FT_UInt32 value )
{
FT_UInt32 value2;
/*
* We simply clear the lowest bit in each iteration. When
* we reach 0, we know that the previous value was our result.
*/
for ( ;; )
{
value2 = value & (value - 1); /* clear lowest bit */
if ( value2 == 0 )
break;
value = value2;
}
return value;
}
/* END */