ref: 91481f8a4bc73fa0f1cd36b6a10ce632c21248aa
dir: /src/cache/ftcsbits.c/
/***************************************************************************/
/* */
/* ftcsbits.c */
/* */
/* FreeType sbits manager (body). */
/* */
/* Copyright 2000 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 <freetype/cache/ftcsbits.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/fterrors.h>
#include <string.h> /* memcmp() */
#define FTC_SBITSET_ELEMENT_COUNT 16
typedef struct FTC_SBitSetRec_
{
FTC_ChunkSetRec root;
FTC_Image_Desc desc;
} FTC_SBitSetRec, *FTC_SBitSet;
typedef struct FTC_SBit_CacheRec_
{
FTC_Chunk_CacheRec root;
} FTC_SBit_CacheRec;
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SBIT CACHE NODES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_CALLBACK_DEF
void ftc_sbit_chunk_node_destroy( FTC_ChunkNode node )
{
FTC_ChunkSet cset = node->cset;
FT_Memory memory = cset->memory;
FT_UInt count = node->num_elements;
FTC_SBit sbit = (FTC_SBit)node->elements;
for ( ; count > 0; sbit++, count-- )
FREE( sbit->buffer );
FREE( node->elements );
FREE( node );
}
FT_CALLBACK_DEF
FT_Error ftc_bitmap_copy( FT_Memory memory,
FT_Bitmap* source,
FTC_SBit target )
{
FT_Error error;
FT_Int pitch = source->pitch;
FT_ULong size;
if ( pitch < 0 )
pitch = -pitch;
size = (FT_ULong)( pitch * source->rows );
if ( !ALLOC( target->buffer, size ) )
MEM_Copy( target->buffer, source->buffer, size );
return error;
}
FT_CALLBACK_DEF
FT_Error ftc_sbit_chunk_node_new( FTC_ChunkSet cset,
FT_UInt index,
FTC_ChunkNode* anode )
{
FT_Error error;
FT_Memory memory = cset->memory;
FTC_SBitSet sbitset = (FTC_SBitSet)cset;
FTC_ChunkNode node = 0;
FT_Face face;
FT_Size size;
/* allocate node */
if ( ALLOC( node, sizeof ( *node ) ) )
goto Exit;
/* initialize its inner fields */
error = FTC_ChunkNode_Init( node, cset, index, 1 );
if ( error )
goto Exit;
/* we will now load all glyph images for this chunk */
error = FTC_Manager_Lookup_Size( cset->manager,
&sbitset->desc.font,
&face, &size );
if ( !error )
{
FT_UInt glyph_index = index * cset->element_count;
FT_UInt load_flags = FT_LOAD_DEFAULT;
FT_UInt image_type = sbitset->desc.image_type;
FT_UInt count = node->num_elements;
FTC_SBit sbit = (FTC_SBit)node->elements;
/* determine load flags, depending on the font description's */
/* image type */
if ( FTC_IMAGE_FORMAT( image_type ) == ftc_image_format_bitmap )
{
if ( image_type & ftc_image_flag_monochrome )
load_flags |= FT_LOAD_MONOCHROME;
/* disable embedded bitmaps loading if necessary */
if ( image_type & ftc_image_flag_no_sbits )
load_flags |= FT_LOAD_NO_BITMAP;
}
else
{
FT_ERROR(( "FTC_SBit_Cache: cannot load scalable glyphs in an"
" sbit cache, please check your arguments!\n" ));
error = FT_Err_Invalid_Argument;
goto Exit;
}
/* always render glyphs to bitmaps */
load_flags |= FT_LOAD_RENDER;
if ( image_type & ftc_image_flag_unhinted )
load_flags |= FT_LOAD_NO_HINTING;
if ( image_type & ftc_image_flag_autohinted )
load_flags |= FT_LOAD_FORCE_AUTOHINT;
/* load a chunk of small bitmaps in a row */
for ( ; count > 0; count--, glyph_index++, sbit++ )
{
/* by default, indicates a `missing' glyph */
sbit->buffer = 0;
error = FT_Load_Glyph( face, glyph_index, load_flags );
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;
/* grab the bitmap when possible */
if ( slot->flags & ft_glyph_own_bitmap )
{
slot->flags &= ~ft_glyph_own_bitmap;
sbit->buffer = bitmap->buffer;
}
else
{
/* copy the bitmap into a new buffer -- ignore error */
ftc_bitmap_copy( memory, bitmap, sbit );
}
}
}
}
/* ignore the errors that might have occurred -- */
/* we recognize unloaded glyphs with `sbit.buffer == 0' */
error = 0;
}
Exit:
if ( error && node )
{
FREE( node->elements );
FREE( node );
}
*anode = node;
return error;
}
/* this function is important because it is both part of */
/* an FTC_ChunkSet_Class and an FTC_CacheNode_Class */
/* */
FT_CALLBACK_DEF
FT_ULong ftc_sbit_chunk_node_size( FTC_ChunkNode node )
{
FT_ULong size;
FTC_ChunkSet cset = node->cset;
FT_UInt count = node->num_elements;
FT_Int pitch;
FTC_SBit sbit = (FTC_SBit)node->elements;
/* the node itself */
size = sizeof ( *node );
/* the sbit records */
size += cset->element_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;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SBIT CHUNK SETS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_CALLBACK_DEF
FT_Error ftc_sbit_chunk_set_sizes( FTC_ChunkSet cset,
FTC_Image_Desc* desc )
{
FT_Error error;
FT_Face face;
cset->element_count = FTC_SBITSET_ELEMENT_COUNT;
cset->element_size = sizeof ( FTC_SBitRec );
/* lookup the FT_Face to obtain the number of glyphs */
error = FTC_Manager_Lookup_Face( cset->manager,
desc->font.face_id, &face );
if ( !error )
cset->element_max = face->num_glyphs;
return error;
}
FT_CALLBACK_DEF
FT_Error ftc_sbit_chunk_set_init( FTC_SBitSet sset,
FTC_Image_Desc* type )
{
sset->desc = *type;
return 0;
}
FT_CALLBACK_DEF
FT_Bool ftc_sbit_chunk_set_compare( FTC_SBitSet sset,
FTC_Image_Desc* type )
{
return !memcmp( &sset->desc, type, sizeof ( *type ) );
}
FT_CALLBACK_TABLE_DEF
const FTC_ChunkSet_Class ftc_sbit_chunk_set_class =
{
sizeof( FTC_SBitSetRec ),
(FTC_ChunkSet_InitFunc) ftc_sbit_chunk_set_init,
(FTC_ChunkSet_DoneFunc) 0,
(FTC_ChunkSet_CompareFunc) ftc_sbit_chunk_set_compare,
(FTC_ChunkSet_SizesFunc) ftc_sbit_chunk_set_sizes,
(FTC_ChunkSet_NewNodeFunc) ftc_sbit_chunk_node_new,
(FTC_ChunkSet_SizeNodeFunc) ftc_sbit_chunk_node_size,
(FTC_ChunkSet_DestroyNodeFunc)ftc_sbit_chunk_node_destroy
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SBITS CACHE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_CALLBACK_TABLE_DEF
const FTC_Chunk_Cache_Class ftc_sbit_cache_class =
{
{
sizeof( FTC_SBit_CacheRec ),
(FTC_Cache_InitFunc)FTC_Chunk_Cache_Init,
(FTC_Cache_DoneFunc)FTC_Chunk_Cache_Done
},
(FTC_ChunkSet_Class*)&ftc_sbit_chunk_set_class
};
FT_EXPORT_DEF( FT_Error ) FTC_SBit_Cache_New( FTC_Manager manager,
FTC_SBit_Cache* acache )
{
return FTC_Manager_Register_Cache(
manager,
(FTC_Cache_Class*)&ftc_sbit_cache_class,
(FTC_Cache*)acache );
}
FT_EXPORT( FT_Error ) FTC_SBit_Cache_Lookup( FTC_SBit_Cache cache,
FTC_Image_Desc* desc,
FT_UInt gindex,
FTC_SBit* asbit )
{
FT_Error error;
FTC_ChunkSet cset;
FTC_ChunkNode node;
FT_UInt cindex;
FTC_Manager manager;
FTC_SBitSet sset;
FTC_SBit sbit;
/* check for valid `desc' delayed to FT_Lru_Lookup() */
if ( !cache || !asbit )
return FT_Err_Invalid_Argument;
*asbit = 0;
cset = cache->root.last_cset;
sset = (FTC_SBitSet)cset;
if ( !cset || memcmp( &sset->desc, desc, sizeof ( *desc ) ) )
{
error = FT_Lru_Lookup( cache->root.csets_lru,
(FT_LruKey)desc,
(FT_Pointer*)&cset );
cache->root.last_cset = cset;
if ( error )
goto Exit;
}
error = FTC_ChunkSet_Lookup_Node( cset, gindex, &node, &cindex );
if ( error )
goto Exit;
/* now compress the manager's cache pool if needed */
manager = cache->root.root.manager;
if ( manager->num_bytes > manager->max_bytes )
{
FTC_ChunkNode_Ref ( node );
FTC_Manager_Compress( manager );
FTC_ChunkNode_Unref ( node );
}
sbit = ((FTC_SBit)((FTC_ChunkNode)node)->elements) + cindex;
*asbit = sbit;
Exit:
return error;
}
/* END */