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[sfnt] Adds the functionality to load `SVG' table. 

Adds code to load the SVG table data into an `svg'
structure and set the flag `FT_FACE_FLAG_SVG'.

* include/freetype/freetype.h: Adds `FT_FACE_FLAG_SVG'.

* include/freetype/internal/sfnt.h: Adds the fields
`load_svg' and `free_svg' to `SFNT_Interface'.

* include/freetype/internal/tttypes.h: Adds a void
pointer field `svg' to hold info from `SVG' table.

* include/freetype/internal/tttags.h: Adds the tag
`TTAG_SVG'.

* src/sfnt/ttsvg.c: Writes the functions
`tt_face_load_svg' and `tt_face_free_svg'

* src/sfnt/ttsvg.h: Writes header declarations for
`tt_face_load_svg' and `tt_face_free_svg'.

* src/sfnt/sfdriver.c: Adds the functions
`tt_face_load_svg' and `tt_face_free_svg' to
`sfnt_interface'.

* src/sfnt/sfnt.c: Includes `ttsvg.c'.

* src/sfnt/sfobjs.c: (sfnt_load_face) Adds code to
load `svg' table struct. (sfnt_done_face) Adds code
to free `svg' table struct.
This commit is contained in:
Moazin Khatti 2019-08-05 21:03:49 +05:00
parent 91e6a7b65f
commit 92eeba75c4
9 changed files with 212 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/freetype/freetype.h
View File

@ -141,6 +141,7 @@ FT_BEGIN_HEADER
* FT_FACE_FLAG_GLYPH_NAMES
* FT_FACE_FLAG_EXTERNAL_STREAM
* FT_FACE_FLAG_HINTER
* FT_FACE_FLAG_SVG
*
* FT_HAS_HORIZONTAL
* FT_HAS_VERTICAL
@ -1167,6 +1168,10 @@ FT_BEGIN_HEADER
* table only if the native TrueType hinting engine (with the bytecode
* interpreter) is available and active.
*
* FT_FACE_FLAG_SVG ::
* The font file has an SVG table. The presence of an SVG table
* indicate the presence of OT-SVG glyphs.
*
* FT_FACE_FLAG_CID_KEYED ::
* The face is CID-keyed. In that case, the face is not accessed by
* glyph indices but by CID values. For subsetted CID-keyed fonts this
@ -1223,6 +1228,7 @@ FT_BEGIN_HEADER
#define FT_FACE_FLAG_TRICKY ( 1L << 13 )
#define FT_FACE_FLAG_COLOR ( 1L << 14 )
#define FT_FACE_FLAG_VARIATION ( 1L << 15 )
#define FT_FACE_FLAG_SVG ( 1L << 16 )
/**************************************************************************

12
include/freetype/internal/sfnt.h
View File

@ -778,6 +778,10 @@ FT_BEGIN_HEADER
TT_Get_Name_Func get_name;
TT_Get_Name_ID_Func get_name_id;
/* OpenType SVG support */
TT_Load_Table_Func load_svg;
TT_Free_Table_Func free_svg;
} SFNT_Interface;
@ -824,7 +828,9 @@ FT_BEGIN_HEADER
colr_blend_, \
get_metrics_, \
get_name_, \
get_name_id_ ) \
get_name_id_, \
load_svg_, \
free_svg_ ) \
static const SFNT_Interface class_ = \
{ \
goto_table_, \
@ -864,7 +870,9 @@ FT_BEGIN_HEADER
colr_blend_, \
get_metrics_, \
get_name_, \
get_name_id_ \
get_name_id_, \
load_svg_, \
free_svg_ \
};

3
include/freetype/internal/tttypes.h
View File

@ -1645,6 +1645,9 @@ FT_BEGIN_HEADER
void* cpal;
void* colr;
/* OpenType SVG glyph support */
void* svg;
} TT_FaceRec;

1
include/freetype/tttags.h
View File

@ -96,6 +96,7 @@ FT_BEGIN_HEADER
#define TTAG_sbix FT_MAKE_TAG( 's', 'b', 'i', 'x' )
#define TTAG_sfnt FT_MAKE_TAG( 's', 'f', 'n', 't' )
#define TTAG_SING FT_MAKE_TAG( 'S', 'I', 'N', 'G' )
#define TTAG_SVG FT_MAKE_TAG( 'S', 'V', 'G', ' ' )
#define TTAG_trak FT_MAKE_TAG( 't', 'r', 'a', 'k' )
#define TTAG_true FT_MAKE_TAG( 't', 'r', 'u', 'e' )
#define TTAG_ttc FT_MAKE_TAG( 't', 't', 'c', ' ' )

17
src/sfnt/sfdriver.c
View File

@ -37,6 +37,10 @@
#include "ttcpal.h"
#endif
#ifdef FT_CONFIG_OPTION_SVG
#include "ttsvg.h"
#endif
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
#include "ttpost.h"
#endif
@ -1214,6 +1218,12 @@
#define PUT_COLOR_LAYERS( a ) NULL
#endif
#ifdef FT_CONFIG_OPTION_SVG
#define PUT_SVG_SUPPORT( a ) a
#else
#define PUT_SVG_SUPPORT( a ) NULL
#endif
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
#define PUT_PS_NAMES( a ) a
#else
@ -1294,7 +1304,12 @@
tt_face_get_metrics, /* TT_Get_Metrics_Func get_metrics */
tt_face_get_name, /* TT_Get_Name_Func get_name */
sfnt_get_name_id /* TT_Get_Name_ID_Func get_name_id */
sfnt_get_name_id, /* TT_Get_Name_ID_Func get_name_id */
PUT_SVG_SUPPORT( tt_face_load_svg ),
/* TT_Load_Table_Func load_svg */
PUT_SVG_SUPPORT( tt_face_free_svg )
/* TT_Free_Table_Func free_svg */
)

1
src/sfnt/sfnt.c
View File

@ -27,6 +27,7 @@
#include "ttcmap.c"
#include "ttcolr.c"
#include "ttcpal.c"
#include "ttsvg.c"
#include "ttkern.c"
#include "ttload.c"

11
src/sfnt/sfobjs.c
View File

@ -953,6 +953,11 @@
LOAD_( colr );
}
#ifdef FT_CONFIG_OPTION_SVG
if ( sfnt->load_svg )
LOAD_( svg );
#endif
/* consider the pclt, kerning, and gasp tables as optional */
LOAD_( pclt );
LOAD_( gasp );
@ -1372,6 +1377,12 @@
sfnt->free_cpal( face );
sfnt->free_colr( face );
}
#ifdef FT_CONFIG_OPTION_SVG
/* free svg data */
if ( sfnt->free_svg )
sfnt->free_svg( face );
#endif
}
#ifdef TT_CONFIG_OPTION_BDF

129
src/sfnt/ttsvg.c Normal file
View File

@ -0,0 +1,129 @@
/****************************************************************************
*
* ttsvg.c
*
* OpenType SVG Color (specification).
*
* Copyright (C) 2018-2019 by
* David Turner, Robert Wilhelm, Werner Lemberg and Moazin Khatti.
*
* 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.
*
*/
/**************************************************************************
*
* `SVG' table specification:
*
* https://docs.microsoft.com/en-us/typography/opentype/spec/svg
*
*/
#include <ft2build.h>
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_OBJECTS_H
#include FT_TRUETYPE_TAGS_H
#ifdef FT_CONFIG_OPTION_SVG
#include "ttsvg.h"
typedef struct Svg_
{
FT_UShort version; /* Table version (starting at 0) */
FT_UShort num_entries; /* Number of SVG document records */
/* Pointer to the starting of SVG Document List */
FT_Byte* svg_doc_list;
void* table; /* Memory that backs up SVG */
FT_ULong table_size;
} Svg;
FT_LOCAL_DEF( FT_Error )
tt_face_load_svg( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = face->root.memory;
FT_ULong table_size;
FT_Byte* table = NULL;
FT_Byte* p = NULL;
Svg* svg = NULL;
FT_ULong offsetToSVGDocumentList;
error = face->goto_table( face, TTAG_SVG, stream, &table_size );
if( error )
goto NoSVG;
if( FT_FRAME_EXTRACT( table_size, table ))
goto NoSVG;
/* Allocate the memory for the Svg object */
if( FT_NEW( svg ) )
goto NoSVG;
p = table;
svg->version = FT_NEXT_USHORT( p );
offsetToSVGDocumentList = FT_NEXT_ULONG( p );
if( offsetToSVGDocumentList == 0 )
goto InvalidTable;
svg->svg_doc_list = (FT_Byte*)( table + offsetToSVGDocumentList );
p = svg->svg_doc_list;
svg->num_entries = FT_NEXT_USHORT( p );
FT_TRACE3(( "version: %d\n", svg->version ));
FT_TRACE3(( "num entiries: %d\n", svg->num_entries ));
svg->table = table;
svg->table_size = table_size;
face->svg = svg;
face->root.face_flags |= FT_FACE_FLAG_SVG;
return FT_Err_Ok;
InvalidTable:
error = FT_THROW( Invalid_Table );
NoSVG:
FT_FRAME_RELEASE( table );
FT_FREE( svg );
face->svg = NULL;
return error;
}
FT_LOCAL_DEF( void )
tt_face_free_svg( TT_Face face )
{
FT_Memory memory = face->root.memory;
FT_Stream stream = face->root.stream;
Svg* svg = (Svg*) face->svg;
if( svg )
{
FT_FRAME_RELEASE( svg->table );
FT_FREE( svg );
}
}
#else /* !FT_CONFIG_OPTION_SVG */
/* ANSI C doesn't like empty source files */
typedef int _tt_svg_dummy;
#endif /* !FT_CONFIG_OPTION_SVG */

35
src/sfnt/ttsvg.h Normal file
View File

@ -0,0 +1,35 @@
/****************************************************************************
*
* ttsvg.h
*
* OpenType SVG Color (specification).
*
* Copyright (C) 2018-2019 by
* David Turner, Robert Wilhelm, Werner Lemberg and Moazin Khatti.
*
* 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.
*
*/
#ifndef __TTSVG_H__
#define __TTSVG_H__
#include <ft2build.h>
FT_BEGIN_HEADER
FT_LOCAL( FT_Error )
tt_face_load_svg( TT_Face face,
FT_Stream stream );
FT_LOCAL( void )
tt_face_free_svg( TT_Face face );
FT_END_HEADER
#endif /* __TTSVG_H__ */
/* END */