140 lines
3.9 KiB
C++
140 lines
3.9 KiB
C++
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/*
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* Copyright © 2020 Ebrahim Byagowi
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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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#ifndef HB_DRAW_HH
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#define HB_DRAW_HH
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#include "hb.hh"
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#ifdef HB_EXPERIMENTAL_API
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struct hb_draw_funcs_t
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{
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hb_object_header_t header;
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hb_draw_move_to_func_t move_to;
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hb_draw_line_to_func_t line_to;
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hb_draw_quadratic_to_func_t quadratic_to;
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bool is_quadratic_to_set;
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hb_draw_cubic_to_func_t cubic_to;
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hb_draw_close_path_func_t close_path;
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};
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struct draw_helper_t
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{
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draw_helper_t (const hb_draw_funcs_t *funcs_, void *user_data_)
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{
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funcs = funcs_;
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user_data = user_data_;
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path_open = false;
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path_start_x = current_x = path_start_y = current_y = 0;
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}
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~draw_helper_t () { end_path (); }
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void move_to (hb_position_t x, hb_position_t y)
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{
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if (path_open) end_path ();
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current_x = path_start_x = x;
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current_y = path_start_y = y;
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}
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void line_to (hb_position_t x, hb_position_t y)
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{
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if (equal_to_current (x, y)) return;
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if (!path_open) start_path ();
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funcs->line_to (x, y, user_data);
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current_x = x;
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current_y = y;
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}
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void
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quadratic_to (hb_position_t control_x, hb_position_t control_y,
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hb_position_t to_x, hb_position_t to_y)
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{
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if (equal_to_current (control_x, control_y) && equal_to_current (to_x, to_y))
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return;
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if (!path_open) start_path ();
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if (funcs->is_quadratic_to_set)
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funcs->quadratic_to (control_x, control_y, to_x, to_y, user_data);
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else
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funcs->cubic_to (roundf ((current_x + 2.f * control_x) / 3.f),
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roundf ((current_y + 2.f * control_y) / 3.f),
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roundf ((to_x + 2.f * control_x) / 3.f),
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roundf ((to_y + 2.f * control_y) / 3.f),
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to_x, to_y, user_data);
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current_x = to_x;
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current_y = to_y;
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}
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void
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cubic_to (hb_position_t control1_x, hb_position_t control1_y,
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hb_position_t control2_x, hb_position_t control2_y,
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hb_position_t to_x, hb_position_t to_y)
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{
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if (equal_to_current (control1_x, control1_y) &&
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equal_to_current (control2_x, control2_y) &&
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equal_to_current (to_x, to_y))
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return;
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if (!path_open) start_path ();
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funcs->cubic_to (control1_x, control1_y, control2_x, control2_y, to_x, to_y, user_data);
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current_x = to_x;
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current_y = to_y;
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}
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void end_path ()
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{
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if (path_open)
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{
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if ((path_start_x != current_x) || (path_start_y != current_y))
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funcs->line_to (path_start_x, path_start_y, user_data);
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funcs->close_path (user_data);
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}
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path_open = false;
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path_start_x = current_x = path_start_y = current_y = 0;
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}
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protected:
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bool equal_to_current (hb_position_t x, hb_position_t y)
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{ return current_x == x && current_y == y; }
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void start_path ()
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{
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if (path_open) end_path ();
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path_open = true;
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funcs->move_to (path_start_x, path_start_y, user_data);
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}
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hb_position_t path_start_x;
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hb_position_t path_start_y;
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hb_position_t current_x;
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hb_position_t current_y;
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bool path_open;
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const hb_draw_funcs_t *funcs;
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void *user_data;
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};
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#endif
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#endif /* HB_DRAW_HH */
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