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Diffstat (limited to 'pango/pango-item-private.h')
-rw-r--r-- | pango/pango-item-private.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/pango/pango-item-private.h b/pango/pango-item-private.h new file mode 100644 index 00000000..8bb7e1cd --- /dev/null +++ b/pango/pango-item-private.h @@ -0,0 +1,73 @@ +/* Pango + * + * Copyright (C) 2021 Matthias Clasen + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#ifndef __PANGO_ITEM_PRIVATE_H__ +#define __PANGO_ITEM_PRIVATE_H__ + +#include <pango/pango-item.h> + +G_BEGIN_DECLS + +/** + * We have to do some extra work for adding the char_offset field + * to PangoItem to preserve ABI in the face of pango's open-coded + * structs. + * + * Internally, pango uses the PangoItemPrivate type, and we use + * a bit in the PangoAnalysis flags to indicate whether we are + * dealing with a PangoItemPrivate struct or not. + */ + +#define PANGO_ANALYSIS_FLAG_HAS_CHAR_OFFSET (1 << 7) + +typedef struct _PangoItemPrivate PangoItemPrivate; + +#ifdef __x86_64__ + +struct _PangoItemPrivate +{ + int offset; + int length; + int num_chars; + int char_offset; + PangoAnalysis analysis; +}; + +#else + +struct _PangoItemPrivate +{ + int offset; + int length; + int num_chars; + PangoAnalysis analysis; + int char_offset; +} + +#endif + +G_STATIC_ASSERT (offsetof (PangoItem, offset) == offsetof (PangoItemPrivate, offset)); +G_STATIC_ASSERT (offsetof (PangoItem, length) == offsetof (PangoItemPrivate, length)); +G_STATIC_ASSERT (offsetof (PangoItem, num_chars) == offsetof (PangoItemPrivate, num_chars)); +G_STATIC_ASSERT (offsetof (PangoItem, analysis) == offsetof (PangoItemPrivate, analysis)); + +G_END_DECLS + +#endif /* __PANGO_ITEM_PRIVATE_H__ */ |