| /* |
| * 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" |
| |
| /** |
| * 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: REPLACEME |
| **/ |
| 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: REPLACEME |
| **/ |
| 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: REPLACEME |
| **/ |
| 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); |
| } |
| |
| |
| #endif |