/* * 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 */