ref: a48001361ce01b0b9c3b1408f02d89b5d5fc5642
dir: /src/cache/ftcsbits.c/
/***************************************************************************/
/* */
/* ftcsbits.c */
/* */
/* FreeType sbits manager (body). */
/* */
/* Copyright 2000-2001, 2002, 2003, 2004 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_CACHE_H
#include FT_CACHE_INTERNAL_SBITS_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_H
#include FT_ERRORS_H
#include "ftccback.h"
#include "ftcerror.h"
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SBIT CACHE NODES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static FT_Error
ftc_sbit_copy_bitmap( FTC_SBit sbit,
FT_Bitmap* bitmap,
FT_Memory memory )
{
FT_Error error;
FT_Int pitch = bitmap->pitch;
FT_ULong size;
if ( pitch < 0 )
pitch = -pitch;
size = (FT_ULong)( pitch * bitmap->rows );
if ( !FT_ALLOC( sbit->buffer, size ) )
FT_MEM_COPY( sbit->buffer, bitmap->buffer, size );
return error;
}
FT_EXPORT_DEF( void )
FTC_SNode_Free( FTC_SNode snode,
FTC_Cache cache )
{
FTC_SBit sbit = snode->sbits;
FT_UInt count = snode->count;
FT_Memory memory = cache->memory;
for ( ; count > 0; sbit++, count-- )
FT_FREE( sbit->buffer );
FTC_GNode_Done( FTC_GNODE( snode ), cache );
FT_FREE( snode );
}
FT_LOCAL_DEF( void )
ftc_snode_free( FTC_SNode snode,
FTC_Cache cache )
{
FTC_SNode_Free( snode, cache );
}
static FT_Error
ftc_snode_load( FTC_SNode snode,
FTC_Manager manager,
FT_UInt gindex,
FT_ULong *asize )
{
FT_Error error;
FTC_GNode gnode = FTC_GNODE( snode );
FTC_Family family = gnode->family;
FT_Memory memory = manager->memory;
FT_Face face;
FTC_SBit sbit;
FTC_SFamilyClass clazz;
if ( (FT_UInt)(gindex - gnode->gindex) >= snode->count )
{
FT_ERROR(( "ftc_snode_load: invalid glyph index" ));
return FTC_Err_Invalid_Argument;
}
sbit = snode->sbits + ( gindex - gnode->gindex );
clazz = (FTC_SFamilyClass)family->clazz;
sbit->buffer = 0;
error = clazz->family_load_glyph( family, gindex, manager, &face );
if ( error )
goto BadGlyph;
{
FT_Int temp;
FT_GlyphSlot slot = face->glyph;
FT_Bitmap* bitmap = &slot->bitmap;
FT_Int xadvance, yadvance;
if ( slot->format != FT_GLYPH_FORMAT_BITMAP )
{
FT_ERROR(( "%s: glyph loaded didn't return a bitmap!\n",
"ftc_snode_load" ));
goto BadGlyph;
}
/* Check that our values fit into 8-bit containers! */
/* If this is not the case, our bitmap is too large */
/* and we will leave it as `missing' with sbit.buffer = 0 */
#define CHECK_CHAR( d ) ( temp = (FT_Char)d, temp == d )
#define CHECK_BYTE( d ) ( temp = (FT_Byte)d, temp == d )
/* horizontal advance in pixels */
xadvance = ( slot->metrics.horiAdvance + 32 ) >> 6;
yadvance = ( slot->metrics.vertAdvance + 32 ) >> 6;
if ( !CHECK_BYTE( bitmap->rows ) ||
!CHECK_BYTE( bitmap->width ) ||
!CHECK_CHAR( bitmap->pitch ) ||
!CHECK_CHAR( slot->bitmap_left ) ||
!CHECK_CHAR( slot->bitmap_top ) ||
!CHECK_CHAR( xadvance ) ||
!CHECK_CHAR( yadvance ) )
goto BadGlyph;
sbit->width = (FT_Byte)bitmap->width;
sbit->height = (FT_Byte)bitmap->rows;
sbit->pitch = (FT_Char)bitmap->pitch;
sbit->left = (FT_Char)slot->bitmap_left;
sbit->top = (FT_Char)slot->bitmap_top;
sbit->xadvance = (FT_Char)xadvance;
sbit->yadvance = (FT_Char)yadvance;
sbit->format = (FT_Byte)bitmap->pixel_mode;
sbit->max_grays = (FT_Byte)(bitmap->num_grays - 1);
/* copy the bitmap into a new buffer -- ignore error */
error = ftc_sbit_copy_bitmap( sbit, bitmap, memory );
/* now, compute size */
if ( asize )
*asize = FT_ABS( sbit->pitch ) * sbit->height;
} /* glyph loading successful */
/* ignore the errors that might have occurred -- */
/* we mark unloaded glyphs with `sbit.buffer == 0' */
/* and 'width == 255', 'height == 0' */
/* */
if ( error && error != FTC_Err_Out_Of_Memory )
{
BadGlyph:
sbit->width = 255;
sbit->height = 0;
sbit->buffer = NULL;
error = 0;
}
return error;
}
FT_EXPORT_DEF( FT_Error )
FTC_SNode_New( FTC_SNode *psnode,
FTC_GQuery gquery,
FTC_Cache cache )
{
FT_Memory memory = cache->memory;
FT_Error error;
FTC_SNode snode = NULL;
FT_UInt gindex = gquery->gindex;
FTC_Family family = gquery->family;
FTC_SFamilyClass clazz = FTC_CACHE__SFAMILY_CLASS( cache );
FT_UInt total;
total = clazz->family_get_count( family, cache->manager );
if ( total == 0 || gindex >= total )
{
error = FT_Err_Invalid_Argument;
goto Exit;
}
if ( !FT_NEW( snode ) )
{
FT_UInt count, start;
start = gindex - ( gindex % FTC_SBIT_ITEMS_PER_NODE );
count = total - start;
if ( count > FTC_SBIT_ITEMS_PER_NODE )
count = FTC_SBIT_ITEMS_PER_NODE;
FTC_GNode_Init( FTC_GNODE( snode ), start, family );
snode->count = count;
error = ftc_snode_load( snode,
cache->manager,
gindex,
NULL );
if ( error )
{
FTC_SNode_Free( snode, cache );
snode = NULL;
}
}
Exit:
*psnode = snode;
return error;
}
FT_LOCAL_DEF( FT_Error )
ftc_snode_new( FTC_SNode *psnode,
FTC_GQuery gquery,
FTC_Cache cache )
{
return FTC_SNode_New( psnode, gquery, cache );
}
FT_EXPORT_DEF( FT_ULong )
FTC_SNode_Weight( FTC_SNode snode )
{
FT_UInt count = snode->count;
FTC_SBit sbit = snode->sbits;
FT_Int pitch;
FT_ULong size;
FT_ASSERT( snode->count <= FTC_SBIT_ITEMS_PER_NODE );
/* the node itself */
size = sizeof ( *snode );
for ( ; count > 0; count--, sbit++ )
{
if ( sbit->buffer )
{
pitch = sbit->pitch;
if ( pitch < 0 )
pitch = -pitch;
/* add the size of a given glyph image */
size += pitch * sbit->height;
}
}
return size;
}
FT_LOCAL_DEF( FT_ULong )
ftc_snode_weight( FTC_SNode snode )
{
return FTC_SNode_Weight( snode );
}
FT_EXPORT_DEF( FT_Bool )
FTC_SNode_Compare( FTC_SNode snode,
FTC_GQuery gquery,
FTC_Cache cache )
{
FTC_GNode gnode = FTC_GNODE( snode );
FT_UInt gindex = gquery->gindex;
FT_Bool result;
result = FT_BOOL( gnode->family == gquery->family &&
(FT_UInt)( gindex - gnode->gindex ) < snode->count );
if ( result )
{
/* check if we need to load the glyph bitmap now */
FTC_SBit sbit = snode->sbits + ( gindex - gnode->gindex );
if ( sbit->buffer == NULL && sbit->width != 255 )
{
FT_ULong size;
if ( !ftc_snode_load( snode, cache->manager,
gindex, &size ) )
{
cache->manager->cur_weight += size;
}
}
}
return result;
}
FT_LOCAL_DEF( FT_Bool )
ftc_snode_compare( FTC_SNode snode,
FTC_GQuery gquery,
FTC_Cache cache )
{
return FTC_SNode_Compare( snode, gquery, cache );
}
/* END */