137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/*
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* Copyright © 2018 Adobe Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Adobe Author(s): Michiharu Ariza
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*/
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#include "hb-ot-cff2-table.hh"
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#include "hb-cff2-interp-cs.hh"
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using namespace CFF;
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struct extents_param_t
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{
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void init ()
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{
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path_open = false;
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min_x.set_int (0x7FFFFFFF);
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min_y.set_int (0x7FFFFFFF);
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max_x.set_int (-0x80000000);
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max_y.set_int (-0x80000000);
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}
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void start_path () { path_open = true; }
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void end_path () { path_open = false; }
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bool is_path_open () const { return path_open; }
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void update_bounds (const point_t &pt)
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{
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if (pt.x < min_x) min_x = pt.x;
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if (pt.x > max_x) max_x = pt.x;
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if (pt.y < min_y) min_y = pt.y;
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if (pt.y > max_y) max_y = pt.y;
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}
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bool path_open;
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number_t min_x;
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number_t min_y;
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number_t max_x;
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number_t max_y;
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};
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struct cff2_path_procs_extents_t : path_procs_t<cff2_path_procs_extents_t, cff2_cs_interp_env_t, extents_param_t>
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{
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static void moveto (cff2_cs_interp_env_t &env, extents_param_t& param, const point_t &pt)
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{
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param.end_path ();
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env.moveto (pt);
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}
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static void line (cff2_cs_interp_env_t &env, extents_param_t& param, const point_t &pt1)
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{
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if (!param.is_path_open ())
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{
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param.start_path ();
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param.update_bounds (env.get_pt ());
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}
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env.moveto (pt1);
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param.update_bounds (env.get_pt ());
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}
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static void curve (cff2_cs_interp_env_t &env, extents_param_t& param, const point_t &pt1, const point_t &pt2, const point_t &pt3)
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{
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if (!param.is_path_open ())
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{
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param.start_path ();
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param.update_bounds (env.get_pt ());
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}
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/* include control points */
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param.update_bounds (pt1);
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param.update_bounds (pt2);
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env.moveto (pt3);
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param.update_bounds (env.get_pt ());
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}
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};
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struct cff2_cs_opset_extents_t : cff2_cs_opset_t<cff2_cs_opset_extents_t, extents_param_t, cff2_path_procs_extents_t> {};
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bool OT::cff2::accelerator_t::get_extents (hb_font_t *font,
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hb_codepoint_t glyph,
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hb_glyph_extents_t *extents) const
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{
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if (unlikely (!is_valid () || (glyph >= num_glyphs))) return false;
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unsigned int num_coords;
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const int *coords = hb_font_get_var_coords_normalized (font, &num_coords);
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unsigned int fd = fdSelect->get_fd (glyph);
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cff2_cs_interpreter_t<cff2_cs_opset_extents_t, extents_param_t> interp;
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const byte_str_t str = (*charStrings)[glyph];
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interp.env.init (str, *this, fd, coords, num_coords);
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extents_param_t param;
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param.init ();
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if (unlikely (!interp.interpret (param))) return false;
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if (param.min_x >= param.max_x)
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{
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extents->width = 0;
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extents->x_bearing = 0;
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}
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else
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{
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extents->x_bearing = (int32_t)param.min_x.floor ();
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extents->width = (int32_t)param.max_x.ceil () - extents->x_bearing;
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}
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if (param.min_y >= param.max_y)
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{
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extents->height = 0;
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extents->y_bearing = 0;
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}
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else
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{
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extents->y_bearing = (int32_t)param.max_y.ceil ();
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extents->height = (int32_t)param.min_y.floor () - extents->y_bearing;
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}
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return true;
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}
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