130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
/****************************************************************************
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*
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* ttsvg.c
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*
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* OpenType SVG Color (specification).
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*
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* Copyright (C) 2018-2019 by
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* David Turner, Robert Wilhelm, Werner Lemberg and Moazin Khatti.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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/**************************************************************************
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*
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* `SVG' table specification:
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*
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* https://docs.microsoft.com/en-us/typography/opentype/spec/svg
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*
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*/
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#include <ft2build.h>
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#include FT_INTERNAL_STREAM_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_TRUETYPE_TAGS_H
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#ifdef FT_CONFIG_OPTION_SVG
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#include "ttsvg.h"
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typedef struct Svg_
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{
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FT_UShort version; /* Table version (starting at 0) */
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FT_UShort num_entries; /* Number of SVG document records */
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/* Pointer to the starting of SVG Document List */
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FT_Byte* svg_doc_list;
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void* table; /* Memory that backs up SVG */
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FT_ULong table_size;
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} Svg;
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_svg( TT_Face face,
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FT_Stream stream )
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{
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FT_Error error;
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FT_Memory memory = face->root.memory;
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FT_ULong table_size;
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FT_Byte* table = NULL;
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FT_Byte* p = NULL;
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Svg* svg = NULL;
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FT_ULong offsetToSVGDocumentList;
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error = face->goto_table( face, TTAG_SVG, stream, &table_size );
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if( error )
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goto NoSVG;
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if( FT_FRAME_EXTRACT( table_size, table ))
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goto NoSVG;
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/* Allocate the memory for the Svg object */
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if( FT_NEW( svg ) )
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goto NoSVG;
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p = table;
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svg->version = FT_NEXT_USHORT( p );
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offsetToSVGDocumentList = FT_NEXT_ULONG( p );
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if( offsetToSVGDocumentList == 0 )
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goto InvalidTable;
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svg->svg_doc_list = (FT_Byte*)( table + offsetToSVGDocumentList );
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p = svg->svg_doc_list;
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svg->num_entries = FT_NEXT_USHORT( p );
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FT_TRACE3(( "version: %d\n", svg->version ));
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FT_TRACE3(( "num entiries: %d\n", svg->num_entries ));
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svg->table = table;
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svg->table_size = table_size;
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face->svg = svg;
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face->root.face_flags |= FT_FACE_FLAG_SVG;
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return FT_Err_Ok;
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InvalidTable:
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error = FT_THROW( Invalid_Table );
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NoSVG:
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FT_FRAME_RELEASE( table );
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FT_FREE( svg );
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face->svg = NULL;
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return error;
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}
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FT_LOCAL_DEF( void )
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tt_face_free_svg( TT_Face face )
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{
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FT_Memory memory = face->root.memory;
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FT_Stream stream = face->root.stream;
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Svg* svg = (Svg*) face->svg;
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if( svg )
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{
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FT_FRAME_RELEASE( svg->table );
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FT_FREE( svg );
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}
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}
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#else /* !FT_CONFIG_OPTION_SVG */
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/* ANSI C doesn't like empty source files */
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typedef int _tt_svg_dummy;
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#endif /* !FT_CONFIG_OPTION_SVG */
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