rgraves
/
freetype2
forked from minhngoc25a/freetype2
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Added the incremental loading system for the CID driver. 

Tested using my own unit test code.
This commit is contained in:
Graham Asher 2002-07-18 16:25:57 +00:00
parent 4c7d53a3f4
commit 3849f2388a
1 changed files with 78 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

119
src/cid/cidgload.c
View File

@ -43,75 +43,112 @@
CID_Face face = (CID_Face)decoder->builder.face;
CID_FaceInfo cid = &face->cid;
FT_Byte* p;
FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes;
FT_UInt fd_select;
FT_ULong off1, glyph_len;
FT_Stream stream = face->root.stream;
FT_Error error = 0;
FT_Byte* charstring = 0;
FT_Memory memory = face->root.memory;
FT_UInt glyph_length = 0;
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* For incremental fonts get the character data using the callback function. */
if (face->root.incremental_interface)
{
FT_Data glyph_data;
error = face->root.incremental_interface->funcs->get_glyph_data(face->root.incremental_interface->object,
glyph_index,&glyph_data);
if (error)
goto Exit;
p = (FT_Byte*)glyph_data.pointer;
fd_select = (FT_UInt)cid_get_offset(&p,(FT_Byte)cid->fd_bytes);
glyph_data.pointer += cid->fd_bytes;
glyph_data.length -= cid->fd_bytes;
glyph_length = glyph_data.length;
/* read the CID font dict index and charstring offset from the CIDMap */
if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
glyph_index * entry_len ) ||
FT_FRAME_ENTER( 2 * entry_len ) )
goto Exit;
if (glyph_length == 0)
goto Exit;
if (FT_ALLOC(charstring,glyph_length))
goto Exit;
ft_memcpy(charstring,glyph_data.pointer,glyph_length);
}
else
#endif
p = (FT_Byte*)stream->cursor;
fd_select = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
off1 = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
p += cid->fd_bytes;
glyph_len = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
/* For ordinary fonts read the CID font dictionary index and charstring offset from the CIDMap. */
{
FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes;
FT_ULong off1;
if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
glyph_index * entry_len ) ||
FT_FRAME_ENTER( 2 * entry_len ) )
goto Exit;
FT_FRAME_EXIT();
p = (FT_Byte*)stream->cursor;
fd_select = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
off1 = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
p += cid->fd_bytes;
glyph_length = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
FT_FRAME_EXIT();
/* now, if the glyph is not empty, set up the subrs array, and parse */
/* the charstrings */
if ( glyph_len > 0 )
if (glyph_length == 0)
goto Exit;
if (FT_ALLOC(charstring,glyph_length))
goto Exit;
if (FT_STREAM_READ_AT(cid->data_offset + off1,charstring,glyph_length))
goto Exit;
}
/* Now set up the subrs array and parse the charstrings. */
{
CID_FaceDict dict;
CID_Subrs cid_subrs = face->subrs + fd_select;
FT_Byte* charstring;
FT_Memory memory = face->root.memory;
FT_Int cs_offset;
/* setup subrs */
/* Set up subrs */
decoder->num_subrs = cid_subrs->num_subrs;
decoder->subrs = cid_subrs->code;
decoder->subrs_len = 0;
/* setup font matrix */
/* Set up font matrix */
dict = cid->font_dicts + fd_select;
decoder->font_matrix = dict->font_matrix;
decoder->font_offset = dict->font_offset;
decoder->lenIV = dict->private_dict.lenIV;
/* the charstrings are encoded (stupid!) */
/* load the charstrings, then execute it */
/* Decode the charstring. */
if ( FT_ALLOC( charstring, glyph_len ) )
goto Exit;
/* Adjustment for seed bytes. */
cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
if ( !FT_STREAM_READ_AT( cid->data_offset + off1,
charstring, glyph_len ) )
{
FT_Int cs_offset;
/* Decrypt only if lenIV >= 0. */
if ( decoder->lenIV >= 0 )
cid_decrypt( charstring, glyph_length, 4330 );
/* Adjustment for seed bytes. */
cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
/* Decrypt only if lenIV >= 0. */
if ( decoder->lenIV >= 0 )
cid_decrypt( charstring, glyph_len, 4330 );
error = decoder->funcs.parse_charstrings( decoder,
charstring + cs_offset,
glyph_len - cs_offset );
error = decoder->funcs.parse_charstrings( decoder,
charstring + cs_offset,
glyph_length - cs_offset );
}
FT_FREE( charstring );
FT_FREE( charstring );
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* Incremental fonts can optionally override the metrics. */
if (!error && face->root.incremental_interface && face->root.incremental_interface->funcs->get_glyph_metrics)
{
FT_Bool found = FALSE;
FT_Basic_Glyph_Metrics metrics;
error = face->root.incremental_interface->funcs->get_glyph_metrics(face->root.incremental_interface->object,
glyph_index,FALSE,&metrics,&found);
if (found)
{
decoder->builder.left_bearing.x = metrics.bearing_x;
decoder->builder.left_bearing.y = metrics.bearing_y;
decoder->builder.advance.x = metrics.advance;
decoder->builder.advance.y = 0;
}
}
#endif
Exit:
return error;