ref: 15e065df12bf7ad79000d150cefa5038ee7416b3
dir: /libfreetype/ftcsbits.c/
/***************************************************************************/
/* */
/* ftcsbits.c */
/* */
/* FreeType sbits manager (body). */
/* */
/* Copyright 2000-2001, 2002 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_SMALL_BITMAPS_H
#include FT_CACHE_INTERNAL_GLYPH_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_H
#include FT_ERRORS_H
#include "ftcerror.h"
#define FTC_SBIT_ITEMS_PER_NODE 16
typedef struct FTC_SBitNodeRec_* FTC_SBitNode;
typedef struct FTC_SBitNodeRec_
{
FTC_GlyphNodeRec gnode;
FTC_SBitRec sbits[FTC_SBIT_ITEMS_PER_NODE];
} FTC_SBitNodeRec;
#define FTC_SBIT_NODE( x ) ( (FTC_SBitNode)( x ) )
typedef struct FTC_SBitQueryRec_
{
FTC_GlyphQueryRec gquery;
FTC_ImageTypeRec type;
} FTC_SBitQueryRec, *FTC_SBitQuery;
#define FTC_SBIT_QUERY( x ) ( (FTC_SBitQuery)( x ) )
typedef struct FTC_SBitFamilyRec_* FTC_SBitFamily;
/* sbit family structure */
typedef struct FTC_SBitFamilyRec_
{
FTC_GlyphFamilyRec gfam;
FTC_ImageTypeRec type;
} FTC_SBitFamilyRec;
#define FTC_SBIT_FAMILY( x ) ( (FTC_SBitFamily)( x ) )
#define FTC_SBIT_FAMILY_MEMORY( x ) FTC_GLYPH_FAMILY_MEMORY( &( x )->cset )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** 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_CALLBACK_DEF( void )
ftc_sbit_node_done( FTC_SBitNode snode,
FTC_Cache cache )
{
FTC_SBit sbit = snode->sbits;
FT_UInt count = FTC_GLYPH_NODE( snode )->item_count;
FT_Memory memory = cache->memory;
for ( ; count > 0; sbit++, count-- )
FT_FREE( sbit->buffer );
ftc_glyph_node_done( FTC_GLYPH_NODE( snode ), cache );
}
static FT_Error
ftc_sbit_node_load( FTC_SBitNode snode,
FTC_Manager manager,
FTC_SBitFamily sfam,
FT_UInt gindex,
FT_ULong *asize )
{
FT_Error error;
FTC_GlyphNode gnode = FTC_GLYPH_NODE( snode );
FT_Memory memory;
FT_Face face;
FT_Size size;
FTC_SBit sbit;
if ( gindex < (FT_UInt)gnode->item_start ||
gindex >= (FT_UInt)gnode->item_start + gnode->item_count )
{
FT_ERROR(( "ftc_sbit_node_load: invalid glyph index" ));
return FTC_Err_Invalid_Argument;
}
memory = manager->library->memory;
sbit = snode->sbits + ( gindex - gnode->item_start );
error = FTC_Manager_Lookup_Size( manager, &sfam->type.font,
&face, &size );
if ( !error )
{
/* by default, indicates a `missing' glyph */
sbit->buffer = 0;
error = FT_Load_Glyph( face, gindex, sfam->type.flags | FT_LOAD_RENDER );
if ( !error )
{
FT_Int temp;
FT_GlyphSlot slot = face->glyph;
FT_Bitmap* bitmap = &slot->bitmap;
FT_Int xadvance, yadvance;
/* 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 )
/* XXX: FIXME: add support for vertical layouts maybe */
/* 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 ) )
{
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);
#if 0 /* this doesn't work well with embedded bitmaps !! */
/* grab the bitmap when possible - this is a hack! */
if ( slot->flags & FT_GLYPH_OWN_BITMAP )
{
slot->flags &= ~FT_GLYPH_OWN_BITMAP;
sbit->buffer = bitmap->buffer;
}
else
#endif
{
/* copy the bitmap into a new buffer -- ignore error */
error = ftc_sbit_copy_bitmap( sbit, bitmap, memory );
}
/* now, compute size */
if ( asize )
*asize = ABS( sbit->pitch ) * sbit->height;
} /* glyph dimensions ok */
} /* 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 )
{
sbit->width = 255;
error = 0;
/* sbit->buffer == NULL too! */
}
}
return error;
}
FT_CALLBACK_DEF( FT_Error )
ftc_sbit_node_init( FTC_SBitNode snode,
FTC_GlyphQuery gquery,
FTC_Cache cache )
{
FT_Error error;
ftc_glyph_node_init( FTC_GLYPH_NODE( snode ),
gquery->gindex,
FTC_GLYPH_FAMILY( gquery->query.family ) );
error = ftc_sbit_node_load( snode,
cache->manager,
FTC_SBIT_FAMILY( FTC_QUERY( gquery )->family ),
gquery->gindex,
NULL );
if ( error )
ftc_glyph_node_done( FTC_GLYPH_NODE( snode ), cache );
return error;
}
FT_CALLBACK_DEF( FT_ULong )
ftc_sbit_node_weight( FTC_SBitNode snode )
{
FTC_GlyphNode gnode = FTC_GLYPH_NODE( snode );
FT_UInt count = gnode->item_count;
FTC_SBit sbit = snode->sbits;
FT_Int pitch;
FT_ULong size;
/* the node itself */
size = sizeof ( *snode );
/* the sbit records */
size += FTC_GLYPH_NODE( snode )->item_count * sizeof ( FTC_SBitRec );
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_CALLBACK_DEF( FT_Bool )
ftc_sbit_node_compare( FTC_SBitNode snode,
FTC_SBitQuery squery,
FTC_Cache cache )
{
FTC_GlyphQuery gquery = FTC_GLYPH_QUERY( squery );
FTC_GlyphNode gnode = FTC_GLYPH_NODE( snode );
FT_Bool result;
result = ftc_glyph_node_compare( gnode, gquery );
if ( result )
{
/* check if we need to load the glyph bitmap now */
FT_UInt gindex = gquery->gindex;
FTC_SBit sbit = snode->sbits + ( gindex - gnode->item_start );
if ( sbit->buffer == NULL && sbit->width != 255 )
{
FT_ULong size;
/* yes, it's safe to ignore errors here */
ftc_sbit_node_load( snode,
cache->manager,
FTC_SBIT_FAMILY( FTC_QUERY( squery )->family ),
gindex,
&size );
cache->manager->cur_weight += size;
}
}
return result;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SBITS FAMILIES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_CALLBACK_DEF( FT_Error )
ftc_sbit_family_init( FTC_SBitFamily sfam,
FTC_SBitQuery squery,
FTC_Cache cache )
{
FTC_Manager manager = cache->manager;
FT_Error error;
FT_Face face;
sfam->type = squery->type;
/* we need to compute "cquery.item_total" now */
error = FTC_Manager_Lookup_Face( manager,
squery->type.font.face_id,
&face );
if ( !error )
{
error = ftc_glyph_family_init( FTC_GLYPH_FAMILY( sfam ),
FTC_IMAGE_TYPE_HASH( &sfam->type ),
FTC_SBIT_ITEMS_PER_NODE,
face->num_glyphs,
FTC_GLYPH_QUERY( squery ),
cache );
}
return error;
}
FT_CALLBACK_DEF( FT_Bool )
ftc_sbit_family_compare( FTC_SBitFamily sfam,
FTC_SBitQuery squery )
{
FT_Bool result;
/* we need to set the "cquery.cset" field or our query for */
/* faster glyph comparisons in ftc_sbit_node_compare */
/* */
result = FT_BOOL( FTC_IMAGE_TYPE_COMPARE( &sfam->type, &squery->type ) );
if ( result )
FTC_GLYPH_FAMILY_FOUND( sfam, squery );
return result;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SBITS CACHE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_CALLBACK_TABLE_DEF
const FTC_Cache_ClassRec ftc_sbit_cache_class =
{
sizeof ( FTC_CacheRec ),
(FTC_Cache_InitFunc) ftc_cache_init,
(FTC_Cache_ClearFunc)ftc_cache_clear,
(FTC_Cache_DoneFunc) ftc_cache_done,
sizeof ( FTC_SBitFamilyRec ),
(FTC_Family_InitFunc) ftc_sbit_family_init,
(FTC_Family_CompareFunc)ftc_sbit_family_compare,
(FTC_Family_DoneFunc) ftc_glyph_family_done,
sizeof ( FTC_SBitNodeRec ),
(FTC_Node_InitFunc) ftc_sbit_node_init,
(FTC_Node_WeightFunc) ftc_sbit_node_weight,
(FTC_Node_CompareFunc)ftc_sbit_node_compare,
(FTC_Node_DoneFunc) ftc_sbit_node_done
};
/* documentation is in ftcsbits.h */
FT_EXPORT_DEF( FT_Error )
FTC_SBitCache_New( FTC_Manager manager,
FTC_SBitCache *acache )
{
return FTC_Manager_Register_Cache( manager,
&ftc_sbit_cache_class,
(FTC_Cache*)acache );
}
/* documentation is in ftcsbits.h */
#ifdef FTC_CACHE_USE_INLINE
#define GEN_CACHE_FAMILY_COMPARE( f, q, c ) \
ftc_sbit_family_compare( (FTC_SBitFamily)(f), (FTC_SBitQuery)(q) )
#define GEN_CACHE_NODE_COMPARE( n, q, c ) \
ftc_sbit_node_compare( (FTC_SBitNode)(n), (FTC_SBitQuery)(q), c )
#define GEN_CACHE_LOOKUP ftc_sbit_cache_lookup
#include "ftccache.i"
#else /* !FTC_CACHE_USE_INLINE */
#define ftc_sbit_cache_lookup ftc_cache_lookup
#endif /* !FTC_CACHE_USE_INLINE */
FT_EXPORT_DEF( FT_Error )
FTC_SBitCache_Lookup( FTC_SBitCache cache,
FTC_ImageType type,
FT_UInt gindex,
FTC_SBit *ansbit,
FTC_Node *anode )
{
FT_Error error;
FTC_SBitQueryRec squery;
FTC_SBitNode node;
/* other argument checks delayed to ftc_cache_lookup */
if ( !ansbit )
return FTC_Err_Invalid_Argument;
*ansbit = NULL;
if ( anode )
*anode = NULL;
squery.gquery.gindex = gindex;
squery.type = *type;
error = ftc_sbit_cache_lookup( FTC_CACHE( cache ),
FTC_QUERY( &squery ),
(FTC_Node*)&node );
if ( !error )
{
*ansbit = node->sbits + ( gindex - FTC_GLYPH_NODE( node )->item_start );
if ( anode )
{
*anode = FTC_NODE( node );
FTC_NODE( node )->ref_count++;
}
}
return error;
}
/* backwards-compatibility functions */
FT_EXPORT_DEF( FT_Error )
FTC_SBit_Cache_New( FTC_Manager manager,
FTC_SBit_Cache *acache )
{
return FTC_SBitCache_New( manager, (FTC_SBitCache*)acache );
}
FT_EXPORT_DEF( FT_Error )
FTC_SBit_Cache_Lookup( FTC_SBit_Cache cache,
FTC_Image_Desc* desc,
FT_UInt gindex,
FTC_SBit *ansbit )
{
FTC_ImageTypeRec type0;
if ( !desc )
return FTC_Err_Invalid_Argument;
type0.font = desc->font;
type0.flags = 0;
/* convert image type flags to load flags */
{
FT_UInt load_flags = FT_LOAD_DEFAULT;
FT_UInt type = desc->image_type;
/* determine load flags, depending on the font description's */
/* image type */
if ( ftc_image_format( type ) == ftc_image_format_bitmap )
{
if ( type & ftc_image_flag_monochrome )
load_flags |= FT_LOAD_MONOCHROME;
/* disable embedded bitmaps loading if necessary */
if ( type & ftc_image_flag_no_sbits )
load_flags |= FT_LOAD_NO_BITMAP;
}
else
{
/* we want an outline, don't load embedded bitmaps */
load_flags |= FT_LOAD_NO_BITMAP;
if ( type & ftc_image_flag_unscaled )
load_flags |= FT_LOAD_NO_SCALE;
}
/* always render glyphs to bitmaps */
load_flags |= FT_LOAD_RENDER;
if ( type & ftc_image_flag_unhinted )
load_flags |= FT_LOAD_NO_HINTING;
if ( type & ftc_image_flag_autohinted )
load_flags |= FT_LOAD_FORCE_AUTOHINT;
type0.flags = load_flags;
}
return FTC_SBitCache_Lookup( (FTC_SBitCache)cache,
&type0,
gindex,
ansbit,
NULL );
}
/* END */