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+/*
+ * 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: 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);
+}
+
+
+#endif