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/*
* Copyright © 2018 Adobe Inc.
*
* 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.
*
* Adobe Author(s): Michiharu Ariza
*/
#include "hb.hh"
#ifndef HB_NO_OT_FONT_CFF
#include "hb-ot-cff2-table.hh"
#include "hb-cff2-interp-cs.hh"
using namespace CFF;
struct cff2_extents_param_t
{
void init ()
{
path_open = false;
min_x.set_int (INT_MAX);
min_y.set_int (INT_MAX);
max_x.set_int (INT_MIN);
max_y.set_int (INT_MIN);
}
void start_path () { path_open = true; }
void end_path () { path_open = false; }
bool is_path_open () const { return path_open; }
void update_bounds (const point_t &pt)
{
if (pt.x < min_x) min_x = pt.x;
if (pt.x > max_x) max_x = pt.x;
if (pt.y < min_y) min_y = pt.y;
if (pt.y > max_y) max_y = pt.y;
}
bool path_open;
number_t min_x;
number_t min_y;
number_t max_x;
number_t max_y;
};
struct cff2_path_procs_extents_t : path_procs_t<cff2_path_procs_extents_t, cff2_cs_interp_env_t, cff2_extents_param_t>
{
static void moveto (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt)
{
param.end_path ();
env.moveto (pt);
}
static void line (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt1)
{
if (!param.is_path_open ())
{
param.start_path ();
param.update_bounds (env.get_pt ());
}
env.moveto (pt1);
param.update_bounds (env.get_pt ());
}
static void curve (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt1, const point_t &pt2, const point_t &pt3)
{
if (!param.is_path_open ())
{
param.start_path ();
param.update_bounds (env.get_pt ());
}
/* include control points */
param.update_bounds (pt1);
param.update_bounds (pt2);
env.moveto (pt3);
param.update_bounds (env.get_pt ());
}
};
struct cff2_cs_opset_extents_t : cff2_cs_opset_t<cff2_cs_opset_extents_t, cff2_extents_param_t, cff2_path_procs_extents_t> {};
bool OT::cff2::accelerator_t::get_extents (hb_font_t *font,
hb_codepoint_t glyph,
hb_glyph_extents_t *extents) const
{
#ifdef HB_NO_OT_FONT_CFF
/* XXX Remove check when this code moves to .hh file. */
return true;
#endif
if (unlikely (!is_valid () || (glyph >= num_glyphs))) return false;
unsigned int fd = fdSelect->get_fd (glyph);
cff2_cs_interpreter_t<cff2_cs_opset_extents_t, cff2_extents_param_t> interp;
const byte_str_t str = (*charStrings)[glyph];
interp.env.init (str, *this, fd, font->coords, font->num_coords);
cff2_extents_param_t param;
param.init ();
if (unlikely (!interp.interpret (param))) return false;
if (param.min_x >= param.max_x)
{
extents->width = 0;
extents->x_bearing = 0;
}
else
{
extents->x_bearing = font->em_scalef_x (param.min_x.to_real ());
extents->width = font->em_scalef_x (param.max_x.to_real () - param.min_x.to_real ());
}
if (param.min_y >= param.max_y)
{
extents->height = 0;
extents->y_bearing = 0;
}
else
{
extents->y_bearing = font->em_scalef_y (param.max_y.to_real ());
extents->height = font->em_scalef_y (param.min_y.to_real () - param.max_y.to_real ());
}
return true;
}
#endif
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