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Diffstat (limited to 'thirdparty/harfbuzz/src/hb-draw.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-draw.hh | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/hb-draw.hh b/thirdparty/harfbuzz/src/hb-draw.hh new file mode 100644 index 0000000000..2aa0a5b4db --- /dev/null +++ b/thirdparty/harfbuzz/src/hb-draw.hh @@ -0,0 +1,139 @@ +/* + * Copyright © 2020 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_DRAW_HH +#define HB_DRAW_HH + +#include "hb.hh" + +#ifdef HB_EXPERIMENTAL_API +struct hb_draw_funcs_t +{ + hb_object_header_t header; + + hb_draw_move_to_func_t move_to; + hb_draw_line_to_func_t line_to; + hb_draw_quadratic_to_func_t quadratic_to; + bool is_quadratic_to_set; + hb_draw_cubic_to_func_t cubic_to; + hb_draw_close_path_func_t close_path; +}; + +struct draw_helper_t +{ + draw_helper_t (const hb_draw_funcs_t *funcs_, void *user_data_) + { + funcs = funcs_; + user_data = user_data_; + path_open = false; + path_start_x = current_x = path_start_y = current_y = 0; + } + ~draw_helper_t () { end_path (); } + + void move_to (hb_position_t x, hb_position_t y) + { + if (path_open) end_path (); + current_x = path_start_x = x; + current_y = path_start_y = y; + } + + void line_to (hb_position_t x, hb_position_t y) + { + if (equal_to_current (x, y)) return; + if (!path_open) start_path (); + funcs->line_to (x, y, user_data); + current_x = x; + current_y = y; + } + + void + quadratic_to (hb_position_t control_x, hb_position_t control_y, + hb_position_t to_x, hb_position_t to_y) + { + if (equal_to_current (control_x, control_y) && equal_to_current (to_x, to_y)) + return; + if (!path_open) start_path (); + if (funcs->is_quadratic_to_set) + funcs->quadratic_to (control_x, control_y, to_x, to_y, user_data); + else + funcs->cubic_to (roundf ((current_x + 2.f * control_x) / 3.f), + roundf ((current_y + 2.f * control_y) / 3.f), + roundf ((to_x + 2.f * control_x) / 3.f), + roundf ((to_y + 2.f * control_y) / 3.f), + to_x, to_y, user_data); + current_x = to_x; + current_y = to_y; + } + + void + cubic_to (hb_position_t control1_x, hb_position_t control1_y, + hb_position_t control2_x, hb_position_t control2_y, + hb_position_t to_x, hb_position_t to_y) + { + if (equal_to_current (control1_x, control1_y) && + equal_to_current (control2_x, control2_y) && + equal_to_current (to_x, to_y)) + return; + if (!path_open) start_path (); + funcs->cubic_to (control1_x, control1_y, control2_x, control2_y, to_x, to_y, user_data); + current_x = to_x; + current_y = to_y; + } + + void end_path () + { + if (path_open) + { + if ((path_start_x != current_x) || (path_start_y != current_y)) + funcs->line_to (path_start_x, path_start_y, user_data); + funcs->close_path (user_data); + } + path_open = false; + path_start_x = current_x = path_start_y = current_y = 0; + } + + protected: + bool equal_to_current (hb_position_t x, hb_position_t y) + { return current_x == x && current_y == y; } + + void start_path () + { + if (path_open) end_path (); + path_open = true; + funcs->move_to (path_start_x, path_start_y, user_data); + } + + hb_position_t path_start_x; + hb_position_t path_start_y; + + hb_position_t current_x; + hb_position_t current_y; + + bool path_open; + const hb_draw_funcs_t *funcs; + void *user_data; +}; +#endif + +#endif /* HB_DRAW_HH */ |