/* * 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. **/ 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; \ if (dfuncs->user_data) \ dfuncs->user_data->name = user_data; \ if (dfuncs->destroy) \ dfuncs->destroy->name = destroy; \ } else { \ dfuncs->func.name = hb_draw_##name##_nil; \ if (dfuncs->user_data) \ dfuncs->user_data->name = nullptr; \ if (dfuncs->destroy) \ dfuncs->destroy->name = nullptr; \ } \ return; \ } 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 ()))) return const_cast (&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_reference: (skip) * @dfuncs: draw functions * * Increases the reference count on @dfuncs by one. This prevents @buffer 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_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