| /* | |
| * Copyright © 2019-2020 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. | |
| */ | |
| #include "hb.hh" | |
| #ifndef HB_NO_DRAW | |
| #include "hb-draw.hh" | |
| #include "hb-geometry.hh" | |
| #include "hb-machinery.hh" | |
| /** | |
| * SECTION:hb-draw | |
| * @title: hb-draw | |
| * @short_description: Glyph drawing | |
| * @include: hb.h | |
| * | |
| * Functions for drawing (extracting) glyph shapes. | |
| * | |
| * The #hb_draw_funcs_t struct can be used with hb_font_draw_glyph(). | |
| **/ | |
| static void | |
| hb_draw_move_to_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED, | |
| hb_draw_state_t *st HB_UNUSED, | |
| float to_x HB_UNUSED, float to_y HB_UNUSED, | |
| void *user_data HB_UNUSED) {} | |
| static void | |
| hb_draw_line_to_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED, | |
| hb_draw_state_t *st HB_UNUSED, | |
| float to_x HB_UNUSED, float to_y HB_UNUSED, | |
| void *user_data HB_UNUSED) {} | |
| static void | |
| hb_draw_quadratic_to_nil (hb_draw_funcs_t *dfuncs, void *draw_data, | |
| hb_draw_state_t *st, | |
| float control_x, float control_y, | |
| float to_x, float to_y, | |
| void *user_data HB_UNUSED) | |
| { | |
| #define HB_ONE_THIRD 0.33333333f | |
| dfuncs->emit_cubic_to (draw_data, *st, | |
| (st->current_x + 2.f * control_x) * HB_ONE_THIRD, | |
| (st->current_y + 2.f * control_y) * HB_ONE_THIRD, | |
| (to_x + 2.f * control_x) * HB_ONE_THIRD, | |
| (to_y + 2.f * control_y) * HB_ONE_THIRD, | |
| to_x, to_y); | |
| #undef HB_ONE_THIRD | |
| } | |
| static void | |
| hb_draw_cubic_to_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED, | |
| hb_draw_state_t *st HB_UNUSED, | |
| float control1_x HB_UNUSED, float control1_y HB_UNUSED, | |
| float control2_x HB_UNUSED, float control2_y HB_UNUSED, | |
| float to_x HB_UNUSED, float to_y HB_UNUSED, | |
| void *user_data HB_UNUSED) {} | |
| static void | |
| hb_draw_close_path_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED, | |
| hb_draw_state_t *st HB_UNUSED, | |
| void *user_data HB_UNUSED) {} | |
| static bool | |
| _hb_draw_funcs_set_preamble (hb_draw_funcs_t *dfuncs, | |
| bool func_is_null, | |
| void **user_data, | |
| hb_destroy_func_t *destroy) | |
| { | |
| if (hb_object_is_immutable (dfuncs)) | |
| { | |
| if (*destroy) | |
| (*destroy) (*user_data); | |
| return false; | |
| } | |
| if (func_is_null) | |
| { | |
| if (*destroy) | |
| (*destroy) (*user_data); | |
| *destroy = nullptr; | |
| *user_data = nullptr; | |
| } | |
| return true; | |
| } | |
| static bool | |
| _hb_draw_funcs_set_middle (hb_draw_funcs_t *dfuncs, | |
| void *user_data, | |
| hb_destroy_func_t destroy) | |
| { | |
| if (user_data && !dfuncs->user_data) | |
| { | |
| dfuncs->user_data = (decltype (dfuncs->user_data)) hb_calloc (1, sizeof (*dfuncs->user_data)); | |
| if (unlikely (!dfuncs->user_data)) | |
| goto fail; | |
| } | |
| if (destroy && !dfuncs->destroy) | |
| { | |
| dfuncs->destroy = (decltype (dfuncs->destroy)) hb_calloc (1, sizeof (*dfuncs->destroy)); | |
| if (unlikely (!dfuncs->destroy)) | |
| goto fail; | |
| } | |
| return true; | |
| fail: | |
| if (destroy) | |
| (destroy) (user_data); | |
| return false; | |
| } | |
| #define HB_DRAW_FUNC_IMPLEMENT(name) \ | |
| \ | |
| void \ | |
| hb_draw_funcs_set_##name##_func (hb_draw_funcs_t *dfuncs, \ | |
| hb_draw_##name##_func_t func, \ | |
| void *user_data, \ | |
| hb_destroy_func_t destroy) \ | |
| { \ | |
| if (!_hb_draw_funcs_set_preamble (dfuncs, !func, &user_data, &destroy))\ | |
| return; \ | |
| \ | |
| if (dfuncs->destroy && dfuncs->destroy->name) \ | |
| dfuncs->destroy->name (!dfuncs->user_data ? nullptr : dfuncs->user_data->name); \ | |
| \ | |
| if (!_hb_draw_funcs_set_middle (dfuncs, user_data, destroy)) \ | |
| return; \ | |
| \ | |
| if (func) \ | |
| dfuncs->func.name = func; \ | |
| else \ | |
| dfuncs->func.name = hb_draw_##name##_nil; \ | |
| \ | |
| if (dfuncs->user_data) \ | |
| dfuncs->user_data->name = user_data; \ | |
| if (dfuncs->destroy) \ | |
| dfuncs->destroy->name = destroy; \ | |
| } | |
| HB_DRAW_FUNCS_IMPLEMENT_CALLBACKS | |
| #undef HB_DRAW_FUNC_IMPLEMENT | |
| /** | |
| * hb_draw_funcs_create: | |
| * | |
| * Creates a new draw callbacks object. | |
| * | |
| * Return value: (transfer full): | |
| * A newly allocated #hb_draw_funcs_t with a reference count of 1. The initial | |
| * reference count should be released with hb_draw_funcs_destroy when you are | |
| * done using the #hb_draw_funcs_t. This function never returns `NULL`. If | |
| * memory cannot be allocated, a special singleton #hb_draw_funcs_t object will | |
| * be returned. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| hb_draw_funcs_t * | |
| hb_draw_funcs_create () | |
| { | |
| hb_draw_funcs_t *dfuncs; | |
| if (unlikely (!(dfuncs = hb_object_create<hb_draw_funcs_t> ()))) | |
| return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t)); | |
| dfuncs->func = Null (hb_draw_funcs_t).func; | |
| return dfuncs; | |
| } | |
| DEFINE_NULL_INSTANCE (hb_draw_funcs_t) = | |
| { | |
| HB_OBJECT_HEADER_STATIC, | |
| { | |
| #define HB_DRAW_FUNC_IMPLEMENT(name) hb_draw_##name##_nil, | |
| HB_DRAW_FUNCS_IMPLEMENT_CALLBACKS | |
| #undef HB_DRAW_FUNC_IMPLEMENT | |
| } | |
| }; | |
| /** | |
| * hb_draw_funcs_get_empty: | |
| * | |
| * Fetches the singleton empty draw-functions structure. | |
| * | |
| * Return value: (transfer full): The empty draw-functions structure | |
| * | |
| * Since: 7.0.0 | |
| **/ | |
| hb_draw_funcs_t * | |
| hb_draw_funcs_get_empty () | |
| { | |
| return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t)); | |
| } | |
| /** | |
| * hb_draw_funcs_reference: (skip) | |
| * @dfuncs: draw functions | |
| * | |
| * Increases the reference count on @dfuncs by one. | |
| * | |
| * This prevents @dfuncs from being destroyed until a matching | |
| * call to hb_draw_funcs_destroy() is made. | |
| * | |
| * Return value: (transfer full): | |
| * The referenced #hb_draw_funcs_t. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| hb_draw_funcs_t * | |
| hb_draw_funcs_reference (hb_draw_funcs_t *dfuncs) | |
| { | |
| return hb_object_reference (dfuncs); | |
| } | |
| /** | |
| * hb_draw_funcs_destroy: (skip) | |
| * @dfuncs: draw functions | |
| * | |
| * Deallocate the @dfuncs. | |
| * Decreases the reference count on @dfuncs by one. If the result is zero, then | |
| * @dfuncs and all associated resources are freed. See hb_draw_funcs_reference(). | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| void | |
| hb_draw_funcs_destroy (hb_draw_funcs_t *dfuncs) | |
| { | |
| if (!hb_object_destroy (dfuncs)) return; | |
| if (dfuncs->destroy) | |
| { | |
| #define HB_DRAW_FUNC_IMPLEMENT(name) \ | |
| if (dfuncs->destroy->name) dfuncs->destroy->name (!dfuncs->user_data ? nullptr : dfuncs->user_data->name); | |
| HB_DRAW_FUNCS_IMPLEMENT_CALLBACKS | |
| #undef HB_DRAW_FUNC_IMPLEMENT | |
| } | |
| hb_free (dfuncs->destroy); | |
| hb_free (dfuncs->user_data); | |
| hb_free (dfuncs); | |
| } | |
| /** | |
| * hb_draw_funcs_set_user_data: (skip) | |
| * @dfuncs: The draw-functions structure | |
| * @key: The user-data key | |
| * @data: A pointer to the user data | |
| * @destroy: (nullable): A callback to call when @data is not needed anymore | |
| * @replace: Whether to replace an existing data with the same key | |
| * | |
| * Attaches a user-data key/data pair to the specified draw-functions structure. | |
| * | |
| * Return value: `true` if success, `false` otherwise | |
| * | |
| * Since: 7.0.0 | |
| **/ | |
| hb_bool_t | |
| hb_draw_funcs_set_user_data (hb_draw_funcs_t *dfuncs, | |
| hb_user_data_key_t *key, | |
| void * data, | |
| hb_destroy_func_t destroy, | |
| hb_bool_t replace) | |
| { | |
| return hb_object_set_user_data (dfuncs, key, data, destroy, replace); | |
| } | |
| /** | |
| * hb_draw_funcs_get_user_data: (skip) | |
| * @dfuncs: The draw-functions structure | |
| * @key: The user-data key to query | |
| * | |
| * Fetches the user-data associated with the specified key, | |
| * attached to the specified draw-functions structure. | |
| * | |
| * Return value: (transfer none): A pointer to the user data | |
| * | |
| * Since: 7.0.0 | |
| **/ | |
| void * | |
| hb_draw_funcs_get_user_data (const hb_draw_funcs_t *dfuncs, | |
| hb_user_data_key_t *key) | |
| { | |
| return hb_object_get_user_data (dfuncs, key); | |
| } | |
| /** | |
| * hb_draw_funcs_make_immutable: | |
| * @dfuncs: draw functions | |
| * | |
| * Makes @dfuncs object immutable. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| void | |
| hb_draw_funcs_make_immutable (hb_draw_funcs_t *dfuncs) | |
| { | |
| if (hb_object_is_immutable (dfuncs)) | |
| return; | |
| hb_object_make_immutable (dfuncs); | |
| } | |
| /** | |
| * hb_draw_funcs_is_immutable: | |
| * @dfuncs: draw functions | |
| * | |
| * Checks whether @dfuncs is immutable. | |
| * | |
| * Return value: `true` if @dfuncs is immutable, `false` otherwise | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| hb_bool_t | |
| hb_draw_funcs_is_immutable (hb_draw_funcs_t *dfuncs) | |
| { | |
| return hb_object_is_immutable (dfuncs); | |
| } | |
| /** | |
| * hb_draw_move_to: | |
| * @dfuncs: draw functions | |
| * @draw_data: associated draw data passed by the caller | |
| * @st: current draw state | |
| * @to_x: X component of target point | |
| * @to_y: Y component of target point | |
| * | |
| * Perform a "move-to" draw operation. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| void | |
| hb_draw_move_to (hb_draw_funcs_t *dfuncs, void *draw_data, | |
| hb_draw_state_t *st, | |
| float to_x, float to_y) | |
| { | |
| dfuncs->move_to (draw_data, *st, | |
| to_x, to_y); | |
| } | |
| /** | |
| * hb_draw_line_to: | |
| * @dfuncs: draw functions | |
| * @draw_data: associated draw data passed by the caller | |
| * @st: current draw state | |
| * @to_x: X component of target point | |
| * @to_y: Y component of target point | |
| * | |
| * Perform a "line-to" draw operation. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| void | |
| hb_draw_line_to (hb_draw_funcs_t *dfuncs, void *draw_data, | |
| hb_draw_state_t *st, | |
| float to_x, float to_y) | |
| { | |
| dfuncs->line_to (draw_data, *st, | |
| to_x, to_y); | |
| } | |
| /** | |
| * hb_draw_quadratic_to: | |
| * @dfuncs: draw functions | |
| * @draw_data: associated draw data passed by the caller | |
| * @st: current draw state | |
| * @control_x: X component of control point | |
| * @control_y: Y component of control point | |
| * @to_x: X component of target point | |
| * @to_y: Y component of target point | |
| * | |
| * Perform a "quadratic-to" draw operation. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| void | |
| hb_draw_quadratic_to (hb_draw_funcs_t *dfuncs, void *draw_data, | |
| hb_draw_state_t *st, | |
| float control_x, float control_y, | |
| float to_x, float to_y) | |
| { | |
| dfuncs->quadratic_to (draw_data, *st, | |
| control_x, control_y, | |
| to_x, to_y); | |
| } | |
| /** | |
| * hb_draw_cubic_to: | |
| * @dfuncs: draw functions | |
| * @draw_data: associated draw data passed by the caller | |
| * @st: current draw state | |
| * @control1_x: X component of first control point | |
| * @control1_y: Y component of first control point | |
| * @control2_x: X component of second control point | |
| * @control2_y: Y component of second control point | |
| * @to_x: X component of target point | |
| * @to_y: Y component of target point | |
| * | |
| * Perform a "cubic-to" draw operation. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| void | |
| hb_draw_cubic_to (hb_draw_funcs_t *dfuncs, void *draw_data, | |
| hb_draw_state_t *st, | |
| float control1_x, float control1_y, | |
| float control2_x, float control2_y, | |
| float to_x, float to_y) | |
| { | |
| dfuncs->cubic_to (draw_data, *st, | |
| control1_x, control1_y, | |
| control2_x, control2_y, | |
| to_x, to_y); | |
| } | |
| /** | |
| * hb_draw_close_path: | |
| * @dfuncs: draw functions | |
| * @draw_data: associated draw data passed by the caller | |
| * @st: current draw state | |
| * | |
| * Perform a "close-path" draw operation. | |
| * | |
| * Since: 4.0.0 | |
| **/ | |
| void | |
| hb_draw_close_path (hb_draw_funcs_t *dfuncs, void *draw_data, | |
| hb_draw_state_t *st) | |
| { | |
| dfuncs->close_path (draw_data, *st); | |
| } | |
| static void | |
| hb_draw_extents_move_to (hb_draw_funcs_t *dfuncs HB_UNUSED, | |
| void *data, | |
| hb_draw_state_t *st, | |
| float to_x, float to_y, | |
| void *user_data HB_UNUSED) | |
| { | |
| hb_extents_t *extents = (hb_extents_t *) data; | |
| extents->add_point (to_x, to_y); | |
| } | |
| static void | |
| hb_draw_extents_line_to (hb_draw_funcs_t *dfuncs HB_UNUSED, | |
| void *data, | |
| hb_draw_state_t *st, | |
| float to_x, float to_y, | |
| void *user_data HB_UNUSED) | |
| { | |
| hb_extents_t *extents = (hb_extents_t *) data; | |
| extents->add_point (to_x, to_y); | |
| } | |
| static void | |
| hb_draw_extents_quadratic_to (hb_draw_funcs_t *dfuncs HB_UNUSED, | |
| void *data, | |
| hb_draw_state_t *st, | |
| float control_x, float control_y, | |
| float to_x, float to_y, | |
| void *user_data HB_UNUSED) | |
| { | |
| hb_extents_t *extents = (hb_extents_t *) data; | |
| extents->add_point (control_x, control_y); | |
| extents->add_point (to_x, to_y); | |
| } | |
| static void | |
| hb_draw_extents_cubic_to (hb_draw_funcs_t *dfuncs HB_UNUSED, | |
| void *data, | |
| hb_draw_state_t *st, | |
| float control1_x, float control1_y, | |
| float control2_x, float control2_y, | |
| float to_x, float to_y, | |
| void *user_data HB_UNUSED) | |
| { | |
| hb_extents_t *extents = (hb_extents_t *) data; | |
| extents->add_point (control1_x, control1_y); | |
| extents->add_point (control2_x, control2_y); | |
| extents->add_point (to_x, to_y); | |
| } | |
| static inline void free_static_draw_extents_funcs (); | |
| static struct hb_draw_extents_funcs_lazy_loader_t : hb_draw_funcs_lazy_loader_t<hb_draw_extents_funcs_lazy_loader_t> | |
| { | |
| static hb_draw_funcs_t *create () | |
| { | |
| hb_draw_funcs_t *funcs = hb_draw_funcs_create (); | |
| hb_draw_funcs_set_move_to_func (funcs, hb_draw_extents_move_to, nullptr, nullptr); | |
| hb_draw_funcs_set_line_to_func (funcs, hb_draw_extents_line_to, nullptr, nullptr); | |
| hb_draw_funcs_set_quadratic_to_func (funcs, hb_draw_extents_quadratic_to, nullptr, nullptr); | |
| hb_draw_funcs_set_cubic_to_func (funcs, hb_draw_extents_cubic_to, nullptr, nullptr); | |
| hb_draw_funcs_make_immutable (funcs); | |
| hb_atexit (free_static_draw_extents_funcs); | |
| return funcs; | |
| } | |
| } static_draw_extents_funcs; | |
| static inline | |
| void free_static_draw_extents_funcs () | |
| { | |
| static_draw_extents_funcs.free_instance (); | |
| } | |
| hb_draw_funcs_t * | |
| hb_draw_extents_get_funcs () | |
| { | |
| return static_draw_extents_funcs.get_unconst (); | |
| } | |
| #endif |