212 lines
6.5 KiB
C++
212 lines
6.5 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.hh"
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#ifndef HB_NO_OT_FONT_CFF
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#include "hb-ot-cff2-table.hh"
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#include "hb-cff2-interp-cs.hh"
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#include "hb-draw.hh"
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using namespace CFF;
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struct cff2_extents_param_t
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{
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cff2_extents_param_t ()
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{
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min_x.set_int (INT_MAX);
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min_y.set_int (INT_MAX);
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max_x.set_int (INT_MIN);
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max_y.set_int (INT_MIN);
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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 = false;
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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<number_t>, cff2_extents_param_t>
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{
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static void moveto (cff2_cs_interp_env_t<number_t> &env, cff2_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<number_t> &env, cff2_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<number_t> &env, cff2_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, cff2_extents_param_t, number_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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#ifdef HB_NO_OT_FONT_CFF
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/* XXX Remove check when this code moves to .hh file. */
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return true;
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#endif
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if (unlikely (!is_valid () || (glyph >= num_glyphs))) return false;
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unsigned int fd = fdSelect->get_fd (glyph);
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const hb_ubytes_t str = (*charStrings)[glyph];
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cff2_cs_interp_env_t<number_t> env (str, *this, fd, font->coords, font->num_coords);
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cff2_cs_interpreter_t<cff2_cs_opset_extents_t, cff2_extents_param_t, number_t> interp (env);
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cff2_extents_param_t param;
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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 = font->em_scalef_x (param.min_x.to_real ());
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extents->width = font->em_scalef_x (param.max_x.to_real ()) - 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 = font->em_scalef_y (param.max_y.to_real ());
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extents->height = font->em_scalef_y (param.min_y.to_real ()) - extents->y_bearing;
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}
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return true;
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}
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struct cff2_path_param_t
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{
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cff2_path_param_t (hb_font_t *font_, hb_draw_session_t &draw_session_)
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{
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draw_session = &draw_session_;
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font = font_;
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}
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void move_to (const point_t &p)
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{ draw_session->move_to (font->em_fscalef_x (p.x.to_real ()), font->em_fscalef_y (p.y.to_real ())); }
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void line_to (const point_t &p)
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{ draw_session->line_to (font->em_fscalef_x (p.x.to_real ()), font->em_fscalef_y (p.y.to_real ())); }
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void cubic_to (const point_t &p1, const point_t &p2, const point_t &p3)
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{
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draw_session->cubic_to (font->em_fscalef_x (p1.x.to_real ()), font->em_fscalef_y (p1.y.to_real ()),
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font->em_fscalef_x (p2.x.to_real ()), font->em_fscalef_y (p2.y.to_real ()),
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font->em_fscalef_x (p3.x.to_real ()), font->em_fscalef_y (p3.y.to_real ()));
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}
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protected:
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hb_draw_session_t *draw_session;
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hb_font_t *font;
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};
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struct cff2_path_procs_path_t : path_procs_t<cff2_path_procs_path_t, cff2_cs_interp_env_t<number_t>, cff2_path_param_t>
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{
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static void moveto (cff2_cs_interp_env_t<number_t> &env, cff2_path_param_t& param, const point_t &pt)
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{
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param.move_to (pt);
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env.moveto (pt);
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}
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static void line (cff2_cs_interp_env_t<number_t> &env, cff2_path_param_t& param, const point_t &pt1)
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{
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param.line_to (pt1);
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env.moveto (pt1);
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}
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static void curve (cff2_cs_interp_env_t<number_t> &env, cff2_path_param_t& param, const point_t &pt1, const point_t &pt2, const point_t &pt3)
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{
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param.cubic_to (pt1, pt2, pt3);
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env.moveto (pt3);
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}
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};
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struct cff2_cs_opset_path_t : cff2_cs_opset_t<cff2_cs_opset_path_t, cff2_path_param_t, number_t, cff2_path_procs_path_t> {};
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bool OT::cff2::accelerator_t::get_path (hb_font_t *font, hb_codepoint_t glyph, hb_draw_session_t &draw_session) const
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{
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#ifdef HB_NO_OT_FONT_CFF
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/* XXX Remove check when this code moves to .hh file. */
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return true;
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#endif
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if (unlikely (!is_valid () || (glyph >= num_glyphs))) return false;
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unsigned int fd = fdSelect->get_fd (glyph);
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const hb_ubytes_t str = (*charStrings)[glyph];
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cff2_cs_interp_env_t<number_t> env (str, *this, fd, font->coords, font->num_coords);
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cff2_cs_interpreter_t<cff2_cs_opset_path_t, cff2_path_param_t, number_t> interp (env);
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cff2_path_param_t param (font, draw_session);
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if (unlikely (!interp.interpret (param))) return false;
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return true;
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}
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#endif
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