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Added support for the "attach_file" format-specific driver 

interface, used to implement FT_Attach_File.

Note, this is currently very lightly tested..
This commit is contained in:
David Turner 2000-02-13 13:37:38 +00:00
parent 818336fdf4
commit 7663f22288
2 changed files with 220 additions and 65 deletions
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12
src/base/ftdriver.h
View File

@ -118,6 +118,18 @@
typedef void* FT_FormatInterface;
/*************************************************************************/
/* */
/* <FuncType> */
/* FT_Attach_Reader */
/* */
/* <Description> */
/* This function is associated to the "attach_file" driver-specific */
/* interface. It is used to read additional data for a given face */
/* from another input stream/file. For example, it is used to */
/* attach a Type 1 AFM file to a given Type 1 face.. */
/* */
typedef FT_Error (*FT_Attach_Reader)( FT_Face face, FT_Stream stream );
/*************************************************************************/
/*************************************************************************/

271
src/base/ftobjs.c
View File

@ -209,6 +209,79 @@
}
/***************************************************************************
*
* ft_new_input_stream:
*
* create a new input stream object from a FT_Open_Args structure..
*
**************************************************************************/
static
FT_Error ft_new_input_stream( FT_Library library,
FT_Open_Args* args,
FT_Stream *astream )
{
FT_Error error;
FT_Memory memory;
FT_Stream stream;
memory = library->memory;
if ( ALLOC( stream, sizeof(*stream) ) )
return error;
stream->memory = memory;
/* is it a memory stream ------------------------- ? */
if (args->memory_base && args->memory_size)
{
FT_New_Memory_Stream( library,
args->memory_base,
args->memory_size,
stream );
}
/* do we have an 8-bit pathname ------------------ ? */
else if (args->pathname)
error = FT_New_Stream( args->pathname, stream );
/* do we have a custom stream -------------------- ? */
else if (args->stream)
{
/* copy the content of the argument stream into the new stream object */
*stream = *(args->stream);
stream->memory = memory;
}
else
error = FT_Err_Invalid_Argument;
if (error)
FREE(stream);
*astream = stream;
return error;
}
/***************************************************************************
*
* ft_done_stream:
*
* closes and destroys a stream object.
*
**************************************************************************/
static
void ft_done_stream( FT_Stream* astream )
{
FT_Stream stream = *astream;
FT_Memory memory = stream->memory;
if (stream->close)
stream->close( stream );
FREE( stream );
*astream = 0;
}
/*************************************************************************/
/*************************************************************************/
@ -259,6 +332,9 @@
if ( face->generic.finalizer )
face->generic.finalizer( face );
/* close the stream for this face */
ft_done_stream( &face->stream );
/* get rid of it */
FREE( face );
}
@ -935,60 +1011,6 @@
}
/***************************************************************************
*
* ft_new_input_stream:
*
* create a new input stream object from a FT_Open_Args structure..
*
**************************************************************************/
static
FT_Error ft_new_input_stream( FT_Library library,
FT_Open_Args* args,
FT_Stream *astream )
{
FT_Error error;
FT_Memory memory;
FT_Stream stream;
memory = library->memory;
if ( ALLOC( stream, sizeof(*stream) ) )
return error;
stream->memory = memory;
/* is it a memory stream ------------------------- ? */
if (args->memory_base && args->memory_size)
{
FT_New_Memory_Stream( library,
args->memory_base,
args->memory_size,
stream );
}
/* do we have an 8-bit pathname ------------------ ? */
else if (args->pathname)
error = FT_New_Stream( args->pathname, stream );
/* do we have a custom stream -------------------- ? */
else if (args->stream)
{
/* copy the content of the argument stream into the new stream object */
*stream = *(args->stream);
stream->memory = memory;
}
else
error = FT_Err_Invalid_Argument;
if (error)
FREE(stream);
*astream = stream;
return error;
}
/*************************************************************************/
/* */
/* <Function> */
@ -1024,19 +1046,20 @@
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
static
const FT_Open_Args ft_default_open_args =
{ 0, 0, 0, 0, 0 };
EXPORT_FUNC
FT_Error FT_New_Face( FT_Library library,
const char* pathname,
FT_Long face_index,
FT_Face *aface )
{
FT_Open_Args args;
FT_Open_Args args = ft_default_open_args;
args.memory_base = 0;
args.memory_size = 0;
args.stream = 0;
args.pathname = (FT_Byte*)pathname;
return FT_Open_Face( library, &args, face_index, aface );
}
@ -1048,13 +1071,10 @@
FT_Long face_index,
FT_Face* face )
{
FT_Open_Args args;
FT_Open_Args args = ft_default_open_args;
args.memory_base = file_base;
args.memory_size = file_size;
args.pathname = 0;
args.stream = 0;
return FT_Open_Face( library, &args, face_index, face );
}
@ -1083,6 +1103,23 @@
memory = library->memory;
/* if the font driver is specified in the args structure, use */
/* it. Otherwise, we'll scan the list of registered drivers.. */
if (args->driver)
{
driver = args->driver;
/* not all drivers directly support face objects, so check.. */
if (driver->interface.face_object_size)
{
error = open_face( driver, stream, face_index, &face );
if (!error) goto Success;
}
else
error = FT_Err_Invalid_Handle;
goto Fail;
}
{
/* check each font driver for an appropriate format */
FT_Driver* cur = library->drivers;
@ -1091,7 +1128,7 @@
for ( ; cur < limit; cur++ )
{
driver = *cur;
/* not all drivers directly support face object, so check.. */
/* not all drivers directly support face objects, so check.. */
if (driver->interface.face_object_size)
{
error = open_face( driver, stream, face_index, &face );
@ -1152,6 +1189,112 @@
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_File */
/* */
/* <Description> */
/* "Attach" a given font file to an existing face. This is usually */
/* to read additionnal information for a single face object. For */
/* example, it is used to read the AFM files that come with Type 1 */
/* fonts in order to add kerning data and other metrics.. */
/* */
/* <Input> */
/* face :: target face object */
/* */
/* filepathname :: an 8-bit pathname naming the 'metrics' file. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* If your font file is in memory, or if you want to provide your */
/* own input stream object, see FT_Attach_Stream. */
/* */
/* The meaning of the "attach" (i.e. what really happens when the */
/* new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they're doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments.. */
/* */
EXPORT_FUNC
FT_Error FT_Attach_File( FT_Face face,
const char* filepathname )
{
FT_Open_Args open = ft_default_open_args;
open.pathname = (char*)filepathname;
return FT_Attach_Stream( face, &open );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_Stream */
/* */
/* <Description> */
/* This function is similar to FT_Attach_File with the exception */
/* that it reads the attachment from an arbitrary stream. */
/* */
/* <Input> */
/* face :: target face object */
/* */
/* args :: a pointer to an FT_Open_Args structure used to describe */
/* the input stream to FreeType */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* The meaning of the "attach" (i.e. what really happens when the */
/* new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they're doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments.. */
/* */
EXPORT_DEF
FT_Error FT_Attach_Stream( FT_Face face,
FT_Open_Args* parameters )
{
FT_Stream stream;
FT_Error error;
FT_Driver driver;
FTDriver_getInterface get_interface;
if ( !face || !face->driver )
return FT_Err_Invalid_Handle;
driver = face->driver;
error = ft_new_input_stream( driver->library, parameters, &stream );
if (error) goto Exit;
/* we implement FT_Attach_Stream in each driver through the */
/* "attach_file" interface.. */
error = FT_Err_Unimplemented_Feature;
get_interface = driver->interface.get_interface;
if (get_interface)
{
FT_Attach_Reader reader;
reader = (FT_Attach_Reader)get_interface( driver, "attach_file" );
if (reader)
error = reader( face, stream );
}
/* close the attached stream */
ft_done_stream( &stream );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */