harfbuzz/src/harfbuzz-buffer.c

228 lines
5.3 KiB
C
Raw Normal View History

/* harfbuzz-buffer.c: Buffer of glyphs for substitution/positioning
*
* Copyright 2004 Red Hat Software
*
* Portions Copyright 1996-2000 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*/
#include "harfbuzz-impl.h"
#include "harfbuzz-buffer.h"
#include "harfbuzz-gsub-private.h"
#include "harfbuzz-gpos-private.h"
static FT_Error
hb_buffer_ensure( HB_Buffer buffer,
FT_ULong size )
{
FT_Memory memory = buffer->memory;
FT_ULong new_allocated = buffer->allocated;
if (size > new_allocated)
{
FT_Error error;
while (size > new_allocated)
new_allocated += (new_allocated >> 1) + 8;
if ( REALLOC_ARRAY( buffer->in_string, buffer->allocated, new_allocated, HB_GlyphItemRec ) )
return error;
if ( REALLOC_ARRAY( buffer->out_string, buffer->allocated, new_allocated, HB_GlyphItemRec ) )
return error;
if ( REALLOC_ARRAY( buffer->positions, buffer->allocated, new_allocated, HB_PositionRec ) )
return error;
buffer->allocated = new_allocated;
}
return FT_Err_Ok;
}
FT_Error
hb_buffer_new( FT_Memory memory,
HB_Buffer *buffer )
{
FT_Error error;
if ( ALLOC( *buffer, sizeof( HB_BufferRec ) ) )
return error;
(*buffer)->memory = memory;
(*buffer)->in_length = 0;
(*buffer)->out_length = 0;
(*buffer)->allocated = 0;
(*buffer)->in_pos = 0;
(*buffer)->out_pos = 0;
(*buffer)->in_string = NULL;
(*buffer)->out_string = NULL;
(*buffer)->positions = NULL;
(*buffer)->max_ligID = 0;
return FT_Err_Ok;
}
FT_Error
hb_buffer_swap( HB_Buffer buffer )
{
HB_GlyphItem tmp_string;
tmp_string = buffer->in_string;
buffer->in_string = buffer->out_string;
buffer->out_string = tmp_string;
buffer->in_length = buffer->out_length;
buffer->out_length = 0;
buffer->in_pos = 0;
buffer->out_pos = 0;
return FT_Err_Ok;
}
FT_Error
hb_buffer_free( HB_Buffer buffer )
{
FT_Memory memory = buffer->memory;
FREE( buffer->in_string );
FREE( buffer->out_string );
FREE( buffer->positions );
FREE( buffer );
return FT_Err_Ok;
}
FT_Error
hb_buffer_clear( HB_Buffer buffer )
{
buffer->in_length = 0;
buffer->out_length = 0;
buffer->in_pos = 0;
buffer->out_pos = 0;
return FT_Err_Ok;
}
FT_Error
hb_buffer_add_glyph( HB_Buffer buffer,
FT_UInt glyph_index,
FT_UInt properties,
FT_UInt cluster )
{
FT_Error error;
HB_GlyphItem glyph;
error = hb_buffer_ensure( buffer, buffer->in_length + 1 );
if ( error )
return error;
glyph = &buffer->in_string[buffer->in_length];
glyph->gindex = glyph_index;
glyph->properties = properties;
glyph->cluster = cluster;
glyph->component = 0;
glyph->ligID = 0;
glyph->gproperties = HB_GLYPH_PROPERTIES_UNKNOWN;
buffer->in_length++;
return FT_Err_Ok;
}
/* The following function copies `num_out' elements from `glyph_data'
to `buffer->out_string', advancing the in array pointer in the structure
by `num_in' elements, and the out array pointer by `num_out' elements.
Finally, it sets the `length' field of `out' equal to
`pos' of the `out' structure.
If `component' is 0xFFFF, the component value from buffer->in_pos
will copied `num_out' times, otherwise `component' itself will
be used to fill the `component' fields.
If `ligID' is 0xFFFF, the ligID value from buffer->in_pos
will copied `num_out' times, otherwise `ligID' itself will
be used to fill the `ligID' fields.
The properties for all replacement glyphs are taken
from the glyph at position `buffer->in_pos'.
The cluster value for the glyph at position buffer->in_pos is used
for all replacement glyphs */
FT_Error
hb_buffer_add_output_glyphs( HB_Buffer buffer,
FT_UShort num_in,
FT_UShort num_out,
FT_UShort *glyph_data,
FT_UShort component,
FT_UShort ligID )
{
FT_Error error;
FT_UShort i;
FT_UInt properties;
FT_UInt cluster;
error = hb_buffer_ensure( buffer, buffer->out_pos + num_out );
if ( error )
return error;
properties = buffer->in_string[buffer->in_pos].properties;
cluster = buffer->in_string[buffer->in_pos].cluster;
if ( component == 0xFFFF )
component = buffer->in_string[buffer->in_pos].component;
if ( ligID == 0xFFFF )
ligID = buffer->in_string[buffer->in_pos].ligID;
for ( i = 0; i < num_out; i++ )
{
HB_GlyphItem item = &buffer->out_string[buffer->out_pos + i];
item->gindex = glyph_data[i];
item->properties = properties;
item->cluster = cluster;
item->component = component;
item->ligID = ligID;
item->gproperties = HB_GLYPH_PROPERTIES_UNKNOWN;
}
buffer->in_pos += num_in;
buffer->out_pos += num_out;
buffer->out_length = buffer->out_pos;
return FT_Err_Ok;
}
FT_Error
hb_buffer_add_output_glyph( HB_Buffer buffer,
FT_UInt glyph_index,
FT_UShort component,
FT_UShort ligID )
{
FT_UShort glyph_data = glyph_index;
return hb_buffer_add_output_glyphs ( buffer, 1, 1,
&glyph_data, component, ligID );
}
FT_Error
hb_buffer_copy_output_glyph ( HB_Buffer buffer )
{
FT_Error error;
error = hb_buffer_ensure( buffer, buffer->out_pos + 1 );
if ( error )
return error;
buffer->out_string[buffer->out_pos++] = buffer->in_string[buffer->in_pos++];
buffer->out_length = buffer->out_pos;
return FT_Err_Ok;
}
FT_UShort
hb_buffer_allocate_ligid( HB_Buffer buffer )
{
return ++buffer->max_ligID;
}