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+/*
+ * Copyright © 2007,2008,2009 Red Hat, Inc.
+ * Copyright © 2012 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_LAYOUT_PRIVATE_HH
+#define HB_OT_LAYOUT_PRIVATE_HH
+
+#include "hb-private.hh"
+
+#include "hb-ot-layout.h"
+
+#include "hb-font-private.hh"
+#include "hb-buffer-private.hh"
+#include "hb-set-private.hh"
+
+
+/* buffer var allocations, used during the GSUB/GPOS processing */
+#define glyph_props() var1.u16[0] /* GDEF glyph properties */
+#define syllable() var1.u8[2] /* GSUB/GPOS shaping boundaries */
+#define lig_props() var1.u8[3] /* GSUB/GPOS ligature tracking */
+
+#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
+
+/*
+ * GDEF
+ */
+
+typedef enum {
+ HB_OT_LAYOUT_GLYPH_PROPS_UNCLASSIFIED = 0x0001,
+ HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH = 0x0002,
+ HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 0x0004,
+ HB_OT_LAYOUT_GLYPH_PROPS_MARK = 0x0008,
+ HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT = 0x0010
+} hb_ot_layout_glyph_class_mask_t;
+
+
+
+/*
+ * GSUB/GPOS
+ */
+
+/* lig_id / lig_comp
+ *
+ * When a ligature is formed:
+ *
+ * - The ligature glyph and any marks in between all the same newly allocated
+ * lig_id,
+ * - The ligature glyph will get lig_num_comps set to the number of components
+ * - The marks get lig_comp > 0, reflecting which component of the ligature
+ * they were applied to.
+ * - This is used in GPOS to attach marks to the right component of a ligature
+ * in MarkLigPos.
+ *
+ * When a multiple-substitution is done:
+ *
+ * - All resulting glyphs will have lig_id = 0,
+ * - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively.
+ * - This is used in GPOS to attach marks to the first component of a
+ * multiple substitution in MarkBasePos.
+ *
+ * The numbers are also used in GPOS to do mark-to-mark positioning only
+ * to marks that belong to the same component of a ligature in MarkMarPos.
+ */
+#define IS_LIG_BASE 0x10
+static inline void
+set_lig_props_for_ligature (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_num_comps)
+{
+ info.lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
+}
+static inline void
+set_lig_props_for_mark (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_comp)
+{
+ info.lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
+}
+static inline void
+set_lig_props_for_component (hb_glyph_info_t &info, unsigned int comp)
+{
+ set_lig_props_for_mark (info, 0, comp);
+}
+
+static inline unsigned int
+get_lig_id (const hb_glyph_info_t &info)
+{
+ return info.lig_props() >> 5;
+}
+static inline bool
+is_a_ligature (const hb_glyph_info_t &info)
+{
+ return !!(info.lig_props() & IS_LIG_BASE);
+}
+static inline unsigned int
+get_lig_comp (const hb_glyph_info_t &info)
+{
+ if (is_a_ligature (info))
+ return 0;
+ else
+ return info.lig_props() & 0x0F;
+}
+static inline unsigned int
+get_lig_num_comps (const hb_glyph_info_t &info)
+{
+ if ((info.glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) && is_a_ligature (info))
+ return info.lig_props() & 0x0F;
+ else
+ return 1;
+}
+
+static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) {
+ uint8_t lig_id = buffer->next_serial () & 0x07;
+ if (unlikely (!lig_id))
+ lig_id = allocate_lig_id (buffer); /* in case of overflow */
+ return lig_id;
+}
+
+
+HB_INTERNAL hb_bool_t
+hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
+ unsigned int lookup_index,
+ const hb_codepoint_t *glyphs,
+ unsigned int glyphs_length,
+ hb_bool_t zero_context);
+
+
+/* Should be called before all the substitute_lookup's are done. */
+HB_INTERNAL void
+hb_ot_layout_substitute_start (hb_font_t *font,
+ hb_buffer_t *buffer);
+
+HB_INTERNAL hb_bool_t
+hb_ot_layout_substitute_lookup (hb_font_t *font,
+ hb_buffer_t *buffer,
+ unsigned int lookup_index,
+ hb_mask_t mask);
+
+/* Should be called after all the substitute_lookup's are done */
+HB_INTERNAL void
+hb_ot_layout_substitute_finish (hb_font_t *font,
+ hb_buffer_t *buffer);
+
+
+/* Should be called before all the position_lookup's are done. Resets positions to zero. */
+HB_INTERNAL void
+hb_ot_layout_position_start (hb_font_t *font,
+ hb_buffer_t *buffer);
+
+HB_INTERNAL hb_bool_t
+hb_ot_layout_position_lookup (hb_font_t *font,
+ hb_buffer_t *buffer,
+ unsigned int lookup_index,
+ hb_mask_t mask);
+
+/* Should be called after all the position_lookup's are done */
+HB_INTERNAL void
+hb_ot_layout_position_finish (hb_font_t *font,
+ hb_buffer_t *buffer,
+ hb_bool_t zero_width_attached_marks);
+
+
+
+/*
+ * hb_ot_layout_t
+ */
+
+namespace OT {
+ struct GDEF;
+ struct GSUB;
+ struct GPOS;
+}
+
+struct hb_ot_layout_t
+{
+ hb_blob_t *gdef_blob;
+ hb_blob_t *gsub_blob;
+ hb_blob_t *gpos_blob;
+
+ const struct OT::GDEF *gdef;
+ const struct OT::GSUB *gsub;
+ const struct OT::GPOS *gpos;
+
+ unsigned int gsub_lookup_count;
+ unsigned int gpos_lookup_count;
+
+ hb_set_digest_t *gsub_digests;
+ hb_set_digest_t *gpos_digests;
+};
+
+
+HB_INTERNAL hb_ot_layout_t *
+_hb_ot_layout_create (hb_face_t *face);
+
+HB_INTERNAL void
+_hb_ot_layout_destroy (hb_ot_layout_t *layout);
+
+
+
+#endif /* HB_OT_LAYOUT_PRIVATE_HH */