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+/*
+ * Copyright © 2019 Ebrahim Byagowi
+ *
+ * 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.
+ */
+
+#ifndef HB_AAT_LAYOUT_OPBD_TABLE_HH
+#define HB_AAT_LAYOUT_OPBD_TABLE_HH
+
+#include "hb-aat-layout-common.hh"
+#include "hb-open-type.hh"
+
+/*
+ * opbd -- Optical Bounds
+ * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6opbd.html
+ */
+#define HB_AAT_TAG_opbd HB_TAG('o','p','b','d')
+
+
+namespace AAT {
+
+struct OpticalBounds
+{
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ FWORD leftSide;
+ FWORD topSide;
+ FWORD rightSide;
+ FWORD bottomSide;
+ public:
+ DEFINE_SIZE_STATIC (8);
+};
+
+struct opbdFormat0
+{
+ bool get_bounds (hb_font_t *font, hb_codepoint_t glyph_id,
+ hb_glyph_extents_t *extents, const void *base) const
+ {
+ const Offset16To<OpticalBounds> *bounds_offset = lookupTable.get_value (glyph_id, font->face->get_num_glyphs ());
+ if (!bounds_offset) return false;
+ const OpticalBounds &bounds = base+*bounds_offset;
+
+ if (extents)
+ *extents = {
+ font->em_scale_x (bounds.leftSide),
+ font->em_scale_y (bounds.topSide),
+ font->em_scale_x (bounds.rightSide),
+ font->em_scale_y (bounds.bottomSide)
+ };
+ return true;
+ }
+
+ bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base)));
+ }
+
+ protected:
+ Lookup<Offset16To<OpticalBounds>>
+ lookupTable; /* Lookup table associating glyphs with the four
+ * int16 values for the left-side, top-side,
+ * right-side, and bottom-side optical bounds. */
+ public:
+ DEFINE_SIZE_MIN (2);
+};
+
+struct opbdFormat1
+{
+ bool get_bounds (hb_font_t *font, hb_codepoint_t glyph_id,
+ hb_glyph_extents_t *extents, const void *base) const
+ {
+ const Offset16To<OpticalBounds> *bounds_offset = lookupTable.get_value (glyph_id, font->face->get_num_glyphs ());
+ if (!bounds_offset) return false;
+ const OpticalBounds &bounds = base+*bounds_offset;
+
+ hb_position_t left = 0, top = 0, right = 0, bottom = 0, ignore;
+ if (font->get_glyph_contour_point (glyph_id, bounds.leftSide, &left, &ignore) ||
+ font->get_glyph_contour_point (glyph_id, bounds.topSide, &ignore, &top) ||
+ font->get_glyph_contour_point (glyph_id, bounds.rightSide, &right, &ignore) ||
+ font->get_glyph_contour_point (glyph_id, bounds.bottomSide, &ignore, &bottom))
+ {
+ if (extents)
+ *extents = {left, top, right, bottom};
+ return true;
+ }
+ return false;
+ }
+
+ bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base)));
+ }
+
+ protected:
+ Lookup<Offset16To<OpticalBounds>>
+ lookupTable; /* Lookup table associating glyphs with the four
+ * int16 values for the left-side, top-side,
+ * right-side, and bottom-side optical bounds. */
+ public:
+ DEFINE_SIZE_MIN (2);
+};
+
+struct opbd
+{
+ static constexpr hb_tag_t tableTag = HB_AAT_TAG_opbd;
+
+ bool get_bounds (hb_font_t *font, hb_codepoint_t glyph_id,
+ hb_glyph_extents_t *extents) const
+ {
+ switch (format)
+ {
+ case 0: return u.format0.get_bounds (font, glyph_id, extents, this);
+ case 1: return u.format1.get_bounds (font, glyph_id, extents, this);
+ default:return false;
+ }
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!c->check_struct (this) || version.major != 1))
+ return_trace (false);
+
+ switch (format)
+ {
+ case 0: return_trace (u.format0.sanitize (c, this));
+ case 1: return_trace (u.format1.sanitize (c, this));
+ default:return_trace (true);
+ }
+ }
+
+ protected:
+ FixedVersion<>version; /* Version number of the optical bounds
+ * table (0x00010000 for the current version). */
+ HBUINT16 format; /* Format of the optical bounds table.
+ * Format 0 indicates distance and Format 1 indicates
+ * control point. */
+ union {
+ opbdFormat0 format0;
+ opbdFormat1 format1;
+ } u;
+ public:
+ DEFINE_SIZE_MIN (8);
+};
+
+} /* namespace AAT */
+
+
+#endif /* HB_AAT_LAYOUT_OPBD_TABLE_HH */