2006-03-31 12:28:09 +00:00
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/* harfbuzz-buffer.c: Buffer of glyphs for substitution/positioning
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*
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2007-10-11 00:07:58 +00:00
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* Copyright 2004,2007 Red Hat Software
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2006-03-31 12:28:09 +00:00
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*
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* Portions Copyright 1996-2000 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*/
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#include "harfbuzz-impl.h"
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#include "harfbuzz-buffer.h"
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#include "harfbuzz-gsub-private.h"
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#include "harfbuzz-gpos-private.h"
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2007-10-11 00:07:58 +00:00
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/* Here is how the buffer works internally:
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*
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* There are two string pointers: in_string and out_string. They
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* always have same allocated size, but different length and positions.
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*
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* As an optimization, both in_string and out_string may point to the
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* same piece of memory, which is owned by in_string. This remains the
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* case as long as:
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*
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* - copy_glyph() is called
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* - replace_glyph() is called with inplace=TRUE
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* - add_output_glyph() and add_output_glyphs() are not called
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*
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* In that case swap(), and copy_glyph(), and replace_glyph() are all
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* mostly no-op.
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*
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* As soon an add_output_glyph[s]() or replace_glyph() with inplace=FALSE is
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* called, out_string is moved over to an alternate buffer (alt_string), and
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* its current contents (out_length entries) are copied to the alt buffer.
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* This should all remain transparent to the user. swap() then switches
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* in_string and alt_string. alt_string is not allocated until its needed,
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* but after that it's grown with in_string unconditionally.
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*
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2007-10-11 07:12:49 +00:00
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* The buffer->separate_out boolean keeps status of whether out_string points
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* to in_string (FALSE) or alt_string (TRUE).
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2007-10-11 00:07:58 +00:00
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*/
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static HB_Error
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2006-03-31 12:28:09 +00:00
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hb_buffer_ensure( HB_Buffer buffer,
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FT_ULong size )
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{
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FT_ULong new_allocated = buffer->allocated;
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if (size > new_allocated)
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{
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2007-10-11 00:07:58 +00:00
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HB_Error error;
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2006-03-31 12:28:09 +00:00
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while (size > new_allocated)
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new_allocated += (new_allocated >> 1) + 8;
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2007-10-11 07:05:09 +00:00
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if ( buffer->positions )
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{
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if ( REALLOC_ARRAY( buffer->positions, new_allocated, HB_PositionRec ) )
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return error;
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}
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2007-10-11 06:52:07 +00:00
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if ( REALLOC_ARRAY( buffer->in_string, new_allocated, HB_GlyphItemRec ) )
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2007-10-11 00:07:58 +00:00
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return error;
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2007-10-11 07:05:09 +00:00
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2007-10-11 07:12:49 +00:00
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if ( buffer->separate_out )
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{
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if ( REALLOC_ARRAY( buffer->alt_string, new_allocated, HB_GlyphItemRec ) )
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return error;
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buffer->out_string = buffer->alt_string;
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}
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else
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2007-10-11 00:07:58 +00:00
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{
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buffer->out_string = buffer->in_string;
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if ( buffer->alt_string )
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{
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2007-10-11 06:52:07 +00:00
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if ( REALLOC_ARRAY( buffer->alt_string, new_allocated, HB_GlyphItemRec ) )
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2007-10-11 00:07:58 +00:00
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return error;
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}
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}
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2006-03-31 12:28:09 +00:00
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buffer->allocated = new_allocated;
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}
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2007-10-11 00:07:58 +00:00
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return HB_Err_Ok;
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2006-03-31 12:28:09 +00:00
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}
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2007-10-11 00:07:58 +00:00
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static HB_Error
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hb_buffer_duplicate_out_buffer( HB_Buffer buffer )
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{
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if ( !buffer->alt_string )
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{
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HB_Error error;
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if ( ALLOC_ARRAY( buffer->alt_string, buffer->allocated, HB_GlyphItemRec ) )
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return error;
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}
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buffer->out_string = buffer->alt_string;
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memcpy( buffer->out_string, buffer->in_string, buffer->out_length * sizeof (buffer->out_string[0]) );
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2007-10-11 07:12:49 +00:00
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buffer->separate_out = TRUE;
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2007-10-11 00:07:58 +00:00
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return HB_Err_Ok;
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}
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HB_Error
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2007-10-11 07:21:31 +00:00
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hb_buffer_new( HB_Buffer *pbuffer )
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2006-03-31 12:28:09 +00:00
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{
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2007-10-11 07:21:31 +00:00
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HB_Buffer buffer;
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2007-10-11 00:07:58 +00:00
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HB_Error error;
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2006-03-31 12:28:09 +00:00
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2007-10-11 07:21:31 +00:00
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if ( ALLOC( buffer, sizeof( HB_BufferRec ) ) )
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2006-03-31 12:28:09 +00:00
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return error;
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2007-10-11 07:21:31 +00:00
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buffer->allocated = 0;
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buffer->in_string = NULL;
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buffer->alt_string = NULL;
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buffer->positions = NULL;
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2006-03-31 12:28:09 +00:00
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2007-10-11 07:24:47 +00:00
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hb_buffer_clear( buffer );
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2007-10-11 07:21:31 +00:00
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*pbuffer = buffer;
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2007-10-11 00:07:58 +00:00
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return HB_Err_Ok;
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}
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2006-03-31 12:28:09 +00:00
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2007-10-11 07:21:31 +00:00
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void
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hb_buffer_free( HB_Buffer buffer )
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{
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FREE( buffer->in_string );
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FREE( buffer->alt_string );
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buffer->out_string = NULL;
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FREE( buffer->positions );
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FREE( buffer );
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}
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void
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hb_buffer_clear( HB_Buffer buffer )
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{
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buffer->in_length = 0;
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buffer->out_length = 0;
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buffer->in_pos = 0;
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buffer->out_pos = 0;
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buffer->out_string = buffer->in_string;
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buffer->separate_out = FALSE;
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2007-10-11 07:24:47 +00:00
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buffer->max_ligID = 0;
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2007-10-11 07:21:31 +00:00
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}
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void
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hb_buffer_clear_output( HB_Buffer buffer )
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{
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buffer->out_length = 0;
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buffer->out_pos = 0;
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buffer->out_string = buffer->in_string;
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buffer->separate_out = FALSE;
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}
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2007-10-11 07:05:09 +00:00
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HB_Error
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hb_buffer_clear_positions( HB_Buffer buffer )
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{
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if ( !buffer->positions )
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{
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HB_Error error;
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if ( ALLOC_ARRAY( buffer->positions, buffer->allocated, HB_PositionRec ) )
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return error;
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}
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memset (buffer->positions, 0, sizeof (buffer->positions[0]) * buffer->in_length);
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return HB_Err_Ok;
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}
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2007-10-11 00:07:58 +00:00
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void
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2006-03-31 12:28:09 +00:00
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hb_buffer_swap( HB_Buffer buffer )
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{
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HB_GlyphItem tmp_string;
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2007-10-11 00:07:58 +00:00
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int tmp_length;
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int tmp_pos;
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2006-03-31 12:28:09 +00:00
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2007-10-11 07:12:49 +00:00
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if ( buffer->separate_out )
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2007-10-11 00:07:58 +00:00
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{
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tmp_string = buffer->in_string;
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buffer->in_string = buffer->out_string;
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buffer->out_string = tmp_string;
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buffer->alt_string = buffer->out_string;
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}
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2006-03-31 12:28:09 +00:00
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2007-10-11 00:07:58 +00:00
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tmp_length = buffer->in_length;
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2006-03-31 12:28:09 +00:00
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buffer->in_length = buffer->out_length;
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2007-10-11 00:07:58 +00:00
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buffer->out_length = tmp_length;
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2006-03-31 12:28:09 +00:00
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2007-10-11 00:07:58 +00:00
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tmp_pos = buffer->in_pos;
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buffer->in_pos = buffer->out_pos;
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buffer->out_pos = tmp_pos;
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2006-03-31 12:28:09 +00:00
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}
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2007-10-11 00:07:58 +00:00
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HB_Error
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2006-03-31 12:28:09 +00:00
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hb_buffer_add_glyph( HB_Buffer buffer,
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FT_UInt glyph_index,
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FT_UInt properties,
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FT_UInt cluster )
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{
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2007-10-11 00:07:58 +00:00
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HB_Error error;
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2006-03-31 12:28:09 +00:00
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HB_GlyphItem glyph;
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error = hb_buffer_ensure( buffer, buffer->in_length + 1 );
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if ( error )
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return error;
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glyph = &buffer->in_string[buffer->in_length];
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glyph->gindex = glyph_index;
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glyph->properties = properties;
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glyph->cluster = cluster;
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glyph->component = 0;
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glyph->ligID = 0;
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glyph->gproperties = HB_GLYPH_PROPERTIES_UNKNOWN;
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buffer->in_length++;
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2007-10-11 00:07:58 +00:00
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return HB_Err_Ok;
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2006-03-31 12:28:09 +00:00
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}
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/* The following function copies `num_out' elements from `glyph_data'
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to `buffer->out_string', advancing the in array pointer in the structure
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by `num_in' elements, and the out array pointer by `num_out' elements.
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Finally, it sets the `length' field of `out' equal to
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`pos' of the `out' structure.
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If `component' is 0xFFFF, the component value from buffer->in_pos
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will copied `num_out' times, otherwise `component' itself will
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be used to fill the `component' fields.
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If `ligID' is 0xFFFF, the ligID value from buffer->in_pos
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will copied `num_out' times, otherwise `ligID' itself will
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be used to fill the `ligID' fields.
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The properties for all replacement glyphs are taken
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from the glyph at position `buffer->in_pos'.
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The cluster value for the glyph at position buffer->in_pos is used
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for all replacement glyphs */
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2007-10-11 00:07:58 +00:00
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HB_Error
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2006-03-31 12:28:09 +00:00
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hb_buffer_add_output_glyphs( HB_Buffer buffer,
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FT_UShort num_in,
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FT_UShort num_out,
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FT_UShort *glyph_data,
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FT_UShort component,
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FT_UShort ligID )
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{
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2007-10-11 00:07:58 +00:00
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HB_Error error;
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2006-03-31 12:28:09 +00:00
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FT_UShort i;
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FT_UInt properties;
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FT_UInt cluster;
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error = hb_buffer_ensure( buffer, buffer->out_pos + num_out );
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if ( error )
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return error;
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2007-10-11 07:12:49 +00:00
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if ( !buffer->separate_out )
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2007-10-11 00:07:58 +00:00
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{
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error = hb_buffer_duplicate_out_buffer( buffer );
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if ( error )
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return error;
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}
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2006-03-31 12:28:09 +00:00
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properties = buffer->in_string[buffer->in_pos].properties;
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cluster = buffer->in_string[buffer->in_pos].cluster;
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if ( component == 0xFFFF )
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component = buffer->in_string[buffer->in_pos].component;
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if ( ligID == 0xFFFF )
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ligID = buffer->in_string[buffer->in_pos].ligID;
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for ( i = 0; i < num_out; i++ )
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{
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HB_GlyphItem item = &buffer->out_string[buffer->out_pos + i];
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item->gindex = glyph_data[i];
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item->properties = properties;
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item->cluster = cluster;
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item->component = component;
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item->ligID = ligID;
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item->gproperties = HB_GLYPH_PROPERTIES_UNKNOWN;
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}
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buffer->in_pos += num_in;
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buffer->out_pos += num_out;
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buffer->out_length = buffer->out_pos;
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2007-10-11 00:07:58 +00:00
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return HB_Err_Ok;
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2006-03-31 12:28:09 +00:00
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}
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2007-10-11 00:07:58 +00:00
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HB_Error
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2006-03-31 12:28:09 +00:00
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hb_buffer_add_output_glyph( HB_Buffer buffer,
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FT_UInt glyph_index,
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FT_UShort component,
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FT_UShort ligID )
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{
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FT_UShort glyph_data = glyph_index;
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return hb_buffer_add_output_glyphs ( buffer, 1, 1,
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&glyph_data, component, ligID );
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}
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2007-10-11 00:07:58 +00:00
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HB_Error
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2006-03-31 12:28:09 +00:00
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hb_buffer_copy_output_glyph ( HB_Buffer buffer )
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{
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2007-10-11 00:07:58 +00:00
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HB_Error error;
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2006-03-31 12:28:09 +00:00
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error = hb_buffer_ensure( buffer, buffer->out_pos + 1 );
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if ( error )
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return error;
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2007-10-11 07:12:49 +00:00
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if ( buffer->separate_out )
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2007-10-11 00:07:58 +00:00
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{
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buffer->out_string[buffer->out_pos] = buffer->in_string[buffer->in_pos];
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}
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buffer->in_pos++;
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buffer->out_pos++;
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2006-03-31 12:28:09 +00:00
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buffer->out_length = buffer->out_pos;
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2007-10-11 00:07:58 +00:00
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return HB_Err_Ok;
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}
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HB_Error
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hb_buffer_replace_output_glyph( HB_Buffer buffer,
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FT_UInt glyph_index,
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FT_Bool inplace )
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{
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HB_Error error;
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if ( inplace )
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{
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error = hb_buffer_copy_output_glyph ( buffer );
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if ( error )
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return error;
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buffer->out_string[buffer->out_pos-1].gindex = glyph_index;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
return hb_buffer_add_output_glyph( buffer, glyph_index, 0xFFFF, 0xFFFF );
|
|
|
|
}
|
|
|
|
|
|
|
|
return HB_Err_Ok;
|
2006-03-31 12:28:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
FT_UShort
|
|
|
|
hb_buffer_allocate_ligid( HB_Buffer buffer )
|
|
|
|
{
|
2007-08-29 08:46:50 +00:00
|
|
|
return ++buffer->max_ligID;
|
2006-03-31 12:28:09 +00:00
|
|
|
}
|