Quellcode-Bibliothek hb-draw.h Sprache: C

/*
* 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 instead."
#endif

#ifndef HB_DRAW_H
#define HB_DRAW_H

#include "hb.h"

HB_BEGIN_DECLS

/**
* hb_draw_state_t
* @path_open: Whether there is an open path
* @path_start_x: X component of the start of current path
* @path_start_y: Y component of the start of current path
* @current_x: X component of current point
* @current_y: Y component of current point
*
* Current drawing state.
*
* Since: 4.0.0
**/
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_var_num_t   reserved4;
  hb_var_num_t   reserved5;
  hb_var_num_t   reserved6;
  hb_var_num_t   reserved7;
} hb_draw_state_t;

/**
* HB_DRAW_STATE_DEFAULT:
*
* The default #hb_draw_state_t at the start of glyph drawing.
*/
#define HB_DRAW_STATE_DEFAULT {0, 0.f, 0.f, 0.f, 0.f, {0.}, {0.}, {0.}}

/**
* hb_draw_funcs_t:
*
* Glyph draw callbacks.
*
* #hb_draw_move_to_func_t, #hb_draw_line_to_func_t and
* #hb_draw_cubic_to_func_t calls are necessary to be defined but we translate
* #hb_draw_quadratic_to_func_t calls to #hb_draw_cubic_to_func_t if the
* callback isn't defined.
*
* Since: 4.0.0
**/

typedef struct hb_draw_funcs_t hb_draw_funcs_t;

/**
* hb_draw_move_to_func_t:
* @dfuncs: draw functions object
* @draw_data: The data accompanying the draw functions
* @st: current draw state
* @to_x: X component of target point
* @to_y: Y component of target point
* @user_data: User data pointer passed by the caller
*
* A virtual method for the #hb_draw_funcs_t to perform a "move-to" draw
* operation.
*
* Since: 4.0.0
*
**/
typedef void (*hb_draw_move_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
                                        hb_draw_state_t *st,
                                        float to_x, float to_y,
                                        void *user_data);

/**
* hb_draw_line_to_func_t:
* @dfuncs: draw functions object
* @draw_data: The data accompanying the draw functions
* @st: current draw state
* @to_x: X component of target point
* @to_y: Y component of target point
* @user_data: User data pointer passed by the caller
*
* A virtual method for the #hb_draw_funcs_t to perform a "line-to" draw
* operation.
*
* Since: 4.0.0
*
**/
typedef void (*hb_draw_line_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
                                        hb_draw_state_t *st,
                                        float to_x, float to_y,
                                        void *user_data);

/**
* hb_draw_quadratic_to_func_t:
* @dfuncs: draw functions object
* @draw_data: The data accompanying the draw functions
* @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
* @user_data: User data pointer passed by the caller
*
* A virtual method for the #hb_draw_funcs_t to perform a "quadratic-to" draw
* operation.
*
* Since: 4.0.0
*
**/
typedef void (*hb_draw_quadratic_to_func_t) (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_draw_cubic_to_func_t:
* @dfuncs: draw functions object
* @draw_data: The data accompanying the draw functions
* @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
* @user_data: User data pointer passed by the caller
*
* A virtual method for the #hb_draw_funcs_t to perform a "cubic-to" draw
* operation.
*
* Since: 4.0.0
*
**/
typedef void (*hb_draw_cubic_to_func_t) (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,
                                         void *user_data);

/**
* hb_draw_close_path_func_t:
* @dfuncs: draw functions object
* @draw_data: The data accompanying the draw functions
* @st: current draw state
* @user_data: User data pointer passed by the caller
*
* A virtual method for the #hb_draw_funcs_t to perform a "close-path" draw
* operation.
*
* Since: 4.0.0
*
**/
typedef void (*hb_draw_close_path_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
                                           hb_draw_state_t *st,
                                           void *user_data);

/**
* hb_draw_funcs_set_move_to_func:
* @dfuncs: draw functions object
* @func: (closure user_data) (destroy destroy) (scope notified): move-to callback
* @user_data: Data to pass to @func
* @destroy: (nullable): The function to call when @user_data is not needed anymore
*
* Sets move-to callback to the draw functions object.
*
* Since: 4.0.0
**/
HB_EXTERN void
hb_draw_funcs_set_move_to_func (hb_draw_funcs_t        *dfuncs,
                                hb_draw_move_to_func_t  func,
                                void *user_data, hb_destroy_func_t destroy);

/**
* hb_draw_funcs_set_line_to_func:
* @dfuncs: draw functions object
* @func: (closure user_data) (destroy destroy) (scope notified): line-to callback
* @user_data: Data to pass to @func
* @destroy: (nullable): The function to call when @user_data is not needed anymore
*
* Sets line-to callback to the draw functions object.
*
* Since: 4.0.0
**/
HB_EXTERN void
hb_draw_funcs_set_line_to_func (hb_draw_funcs_t        *dfuncs,
                                hb_draw_line_to_func_t  func,
                                void *user_data, hb_destroy_func_t destroy);

/**
* hb_draw_funcs_set_quadratic_to_func:
* @dfuncs: draw functions object
* @func: (closure user_data) (destroy destroy) (scope notified): quadratic-to callback
* @user_data: Data to pass to @func
* @destroy: (nullable): The function to call when @user_data is not needed anymore
*
* Sets quadratic-to callback to the draw functions object.
*
* Since: 4.0.0
**/
HB_EXTERN void
hb_draw_funcs_set_quadratic_to_func (hb_draw_funcs_t             *dfuncs,
                                     hb_draw_quadratic_to_func_t  func,
                                     void *user_data, hb_destroy_func_t destroy);

/**
* hb_draw_funcs_set_cubic_to_func:
* @dfuncs: draw functions
* @func: (closure user_data) (destroy destroy) (scope notified): cubic-to callback
* @user_data: Data to pass to @func
* @destroy: (nullable): The function to call when @user_data is not needed anymore
*
* Sets cubic-to callback to the draw functions object.
*
* Since: 4.0.0
**/
HB_EXTERN void
hb_draw_funcs_set_cubic_to_func (hb_draw_funcs_t         *dfuncs,
                                 hb_draw_cubic_to_func_t  func,
                                 void *user_data, hb_destroy_func_t destroy);

/**
* hb_draw_funcs_set_close_path_func:
* @dfuncs: draw functions object
* @func: (closure user_data) (destroy destroy) (scope notified): close-path callback
* @user_data: Data to pass to @func
* @destroy: (nullable): The function to call when @user_data is not needed anymore
*
* Sets close-path callback to the draw functions object.
*
* Since: 4.0.0
**/
HB_EXTERN void
hb_draw_funcs_set_close_path_func (hb_draw_funcs_t           *dfuncs,
                                   hb_draw_close_path_func_t  func,
                                   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 *dfuncs);

HB_EXTERN void
hb_draw_funcs_destroy (hb_draw_funcs_t *dfuncs);

HB_EXTERN void
hb_draw_funcs_make_immutable (hb_draw_funcs_t *dfuncs);

HB_EXTERN hb_bool_t
hb_draw_funcs_is_immutable (hb_draw_funcs_t *dfuncs);

HB_EXTERN void
hb_draw_move_to (hb_draw_funcs_t *dfuncs, 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 *dfuncs, 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 *dfuncs, 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 *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);

HB_EXTERN void
hb_draw_close_path (hb_draw_funcs_t *dfuncs, void *draw_data,
                    hb_draw_state_t *st);

HB_END_DECLS

#endif /* HB_DRAW_H */

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