harfbuzz/src/hb-draw.h

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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.
*/
#if !defined(HB_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
#error "Include <hb.h> instead."
#endif
#ifndef HB_DRAW_H
#define HB_DRAW_H
#include "hb.h"
HB_BEGIN_DECLS
typedef struct hb_draw_state_t {
hb_bool_t path_open;
float path_start_x;
float path_start_y;
float current_x;
float current_y;
/*< private >*/
hb_var_num_t reserved1;
hb_var_num_t reserved2;
hb_var_num_t reserved3;
} hb_draw_state_t;
#define HB_DRAW_STATE_DEFAULT {0, 0.f, 0.f, 0.f, 0.f, {0.}, {0.}, {0.}}
/**
* hb_draw_funcs_t:
*
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* Glyph draw callbacks.
*
* _move_to, _line_to and _cubic_to calls are necessary to be defined but we
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* translate _quadratic_to calls to _cubic_to if the callback isn't defined.
*
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* Since: REPLACEME
**/
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typedef struct hb_draw_funcs_t hb_draw_funcs_t;
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typedef void (*hb_draw_move_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
hb_draw_state_t *st,
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float to_x, float to_y,
void *user_data);
typedef void (*hb_draw_line_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
hb_draw_state_t *st,
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float to_x, float to_y,
void *user_data);
typedef void (*hb_draw_quadratic_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
hb_draw_state_t *st,
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float control_x, float control_y,
float to_x, float to_y,
void *user_data);
typedef void (*hb_draw_cubic_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
hb_draw_state_t *st,
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float control1_x, float control1_y,
float control2_x, float control2_y,
float to_x, float to_y,
void *user_data);
typedef void (*hb_draw_close_path_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
hb_draw_state_t *st,
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void *user_data);
HB_EXTERN void
hb_draw_funcs_set_move_to_func (hb_draw_funcs_t *funcs,
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hb_draw_move_to_func_t move_to,
void *user_data, hb_destroy_func_t destroy);
HB_EXTERN void
hb_draw_funcs_set_line_to_func (hb_draw_funcs_t *funcs,
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hb_draw_line_to_func_t line_to,
void *user_data, hb_destroy_func_t destroy);
HB_EXTERN void
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hb_draw_funcs_set_quadratic_to_func (hb_draw_funcs_t *funcs,
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hb_draw_quadratic_to_func_t quadratic_to,
void *user_data, hb_destroy_func_t destroy);
HB_EXTERN void
hb_draw_funcs_set_cubic_to_func (hb_draw_funcs_t *funcs,
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hb_draw_cubic_to_func_t cubic_to,
void *user_data, hb_destroy_func_t destroy);
HB_EXTERN void
hb_draw_funcs_set_close_path_func (hb_draw_funcs_t *funcs,
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hb_draw_close_path_func_t close_path,
void *user_data, hb_destroy_func_t destroy);
HB_EXTERN hb_draw_funcs_t *
hb_draw_funcs_create (void);
HB_EXTERN hb_draw_funcs_t *
hb_draw_funcs_reference (hb_draw_funcs_t *funcs);
HB_EXTERN void
hb_draw_funcs_destroy (hb_draw_funcs_t *funcs);
HB_EXTERN void
hb_draw_funcs_make_immutable (hb_draw_funcs_t *funcs);
HB_EXTERN hb_bool_t
hb_draw_funcs_is_immutable (hb_draw_funcs_t *funcs);
HB_EXTERN void
hb_draw_move_to (hb_draw_funcs_t *funcs, void *draw_data,
hb_draw_state_t *st,
float to_x, float to_y);
HB_EXTERN void
hb_draw_line_to (hb_draw_funcs_t *funcs, void *draw_data,
hb_draw_state_t *st,
float to_x, float to_y);
HB_EXTERN void
hb_draw_quadratic_to (hb_draw_funcs_t *funcs, void *draw_data,
hb_draw_state_t *st,
float control_x, float control_y,
float to_x, float to_y);
HB_EXTERN void
hb_draw_cubic_to (hb_draw_funcs_t *funcs, 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);
HB_EXTERN void
hb_draw_close_path (hb_draw_funcs_t *funcs, void *draw_data,
hb_draw_state_t *st);
HB_END_DECLS
#endif /* HB_DRAW_H */