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implement FTC_ImageCache_LookupScaler and FTC_SBitCache_LookupScaler, 

which allow us to specify the font size with a FTC_Scaler structure,
hence enabling fractional point sizes, etc...
This commit is contained in:
David Turner 2007-05-11 14:36:24 +00:00
parent a8b45e6183
commit 711cf84749
3 changed files with 226 additions and 0 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2007-05-11 David Turner <david@freetype.org>
* src/cache/ftbasic.c, include/freetype/ftcache.h: introduce
two new functions FTC_ImageCache_LookupScaler and
FTC_SBitCache_LookupScaler that allows us to lookup glyphs using a
FTC_Scaler object to specify the size. This allows fractional pixel
sizes
2007-05-09 Graham Asher <graham.asher@btinternet.com>
* src/truetype/ttinterp.c (Ins_IP), src/autofit/aflatin.c

108
include/freetype/ftcache.h
View File

@ -776,6 +776,59 @@ FT_BEGIN_HEADER
FTC_Node *anode );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_ImageCache_LookupScaler */
/* */
/* <Description> */
/* A variant of @FTC_ImageCache_Lookup that uses a @FTC_ScalerRec */
/* to specify the face id and its size */
/* */
/* <Input> */
/* cache :: A handle to the source glyph image cache. */
/* */
/* scaler :: A pointer to a scaler descriptor. */
/* */
/* load_flags :: corresponding load flags */
/* */
/* gindex :: The glyph index to retrieve. */
/* */
/* <Output> */
/* aglyph :: The corresponding @FT_Glyph object. 0 in case of */
/* failure. */
/* */
/* anode :: Used to return the address of of the corresponding cache */
/* node after incrementing its reference count (see note */
/* below). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The returned glyph is owned and managed by the glyph image cache. */
/* Never try to transform or discard it manually! You can however */
/* create a copy with @FT_Glyph_Copy and modify the new one. */
/* */
/* If `anode' is _not_ NULL, it receives the address of the cache */
/* node containing the glyph image, after increasing its reference */
/* count. This ensures that the node (as well as the @FT_Glyph) will */
/* always be kept in the cache until you call @FTC_Node_Unref to */
/* `release' it. */
/* */
/* If `anode' is NULL, the cache node is left unchanged, which means */
/* that the @FT_Glyph could be flushed out of the cache on the next */
/* call to one of the caching sub-system APIs. Don't assume that it */
/* is persistent! */
/* */
FT_EXPORT( FT_Error )
FTC_ImageCache_LookupScaler( FTC_ImageCache cache,
FTC_Scaler scaler,
FT_ULong load_flags,
FT_UInt gindex,
FT_Glyph *aglyph,
FTC_Node *anode );
/*************************************************************************/
/* */
/* <Type> */
@ -929,6 +982,61 @@ FT_BEGIN_HEADER
FTC_SBit *sbit,
FTC_Node *anode );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_SBitCache_LookupScaler */
/* */
/* <Description> */
/* A variant of @FTC_SBitCache_Lookup that uses a @FTC_ScalerRec */
/* to specify the face id and its size. */
/* */
/* <Input> */
/* cache :: A handle to the source sbit cache. */
/* */
/* scaler :: A pointer to the scaler descriptor. */
/* */
/* load_flags :: corresponding load flags */
/* */
/* gindex :: The glyph index. */
/* */
/* <Output> */
/* sbit :: A handle to a small bitmap descriptor. */
/* */
/* anode :: Used to return the address of of the corresponding cache */
/* node after incrementing its reference count (see note */
/* below). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The small bitmap descriptor and its bit buffer are owned by the */
/* cache and should never be freed by the application. They might */
/* as well disappear from memory on the next cache lookup, so don't */
/* treat them as persistent data. */
/* */
/* The descriptor's `buffer' field is set to 0 to indicate a missing */
/* glyph bitmap. */
/* */
/* If `anode' is _not_ NULL, it receives the address of the cache */
/* node containing the bitmap, after increasing its reference count. */
/* This ensures that the node (as well as the image) will always be */
/* kept in the cache until you call @FTC_Node_Unref to `release' it. */
/* */
/* If `anode' is NULL, the cache node is left unchanged, which means */
/* that the bitmap could be flushed out of the cache on the next */
/* call to one of the caching sub-system APIs. Don't assume that it */
/* is persistent! */
/* */
FT_EXPORT( FT_Error )
FTC_SBitCache_LookupScaler( FTC_SBitCache cache,
FTC_Scaler scaler,
FT_ULong load_flags,
FT_UInt gindex,
FTC_SBit *sbit,
FTC_Node *anode );
/* */

110
src/cache/ftcbasic.c vendored
View File

@ -383,6 +383,63 @@
}
/* documentation is in ftcache.h */
FT_EXPORT_DEF( FT_Error )
FTC_ImageCache_LookupScaler( FTC_ImageCache cache,
FTC_Scaler scaler,
FT_ULong load_flags,
FT_UInt gindex,
FT_Glyph *aglyph,
FTC_Node *anode )
{
FTC_BasicQueryRec query;
FTC_INode node = 0; /* make compiler happy */
FT_Error error;
FT_UInt32 hash;
/* some argument checks are delayed to FTC_Cache_Lookup */
if ( !aglyph || !scaler )
{
error = FTC_Err_Invalid_Argument;
goto Exit;
}
*aglyph = NULL;
if ( anode )
*anode = NULL;
query.attrs.scaler = scaler[0];
query.attrs.load_flags = load_flags;
hash = FTC_BASIC_ATTR_HASH( &query.attrs ) + gindex;
FTC_GCACHE_LOOKUP_CMP( cache,
ftc_basic_family_compare,
FTC_GNode_Compare,
hash, gindex,
&query,
node,
error );
if ( !error )
{
*aglyph = FTC_INODE( node )->glyph;
if ( anode )
{
*anode = FTC_NODE( node );
FTC_NODE( node )->ref_count++;
}
}
Exit:
return error;
}
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
/* yet another backwards-legacy structure */
@ -652,6 +709,59 @@
}
FT_EXPORT_DEF( FT_Error )
FTC_SBitCache_LookupScaler( FTC_SBitCache cache,
FTC_Scaler scaler,
FT_ULong load_flags,
FT_UInt gindex,
FTC_SBit *ansbit,
FTC_Node *anode )
{
FT_Error error;
FTC_BasicQueryRec query;
FTC_SNode node = 0; /* make compiler happy */
FT_UInt32 hash;
if ( anode )
*anode = NULL;
/* other argument checks delayed to FTC_Cache_Lookup */
if ( !ansbit || !scaler )
return FTC_Err_Invalid_Argument;
*ansbit = NULL;
query.attrs.scaler = scaler[0];
query.attrs.load_flags = load_flags;
/* beware, the hash must be the same for all glyph ranges! */
hash = FTC_BASIC_ATTR_HASH( &query.attrs ) +
gindex / FTC_SBIT_ITEMS_PER_NODE;
FTC_GCACHE_LOOKUP_CMP( cache,
ftc_basic_family_compare,
FTC_SNode_Compare,
hash, gindex,
&query,
node,
error );
if ( error )
goto Exit;
*ansbit = node->sbits + ( gindex - FTC_GNODE( node )->gindex );
if ( anode )
{
*anode = FTC_NODE( node );
FTC_NODE( node )->ref_count++;
}
Exit:
return error;
}
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
FT_EXPORT( FT_Error )