| /* |
| * 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 (likely (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 */ |