341 lines
9.9 KiB
C
341 lines
9.9 KiB
C
/*
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* Copyright © 2019-2020 Ebrahim Byagowi
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#if !defined(HB_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
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#error "Include <hb.h> instead."
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#endif
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#ifndef HB_DRAW_H
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#define HB_DRAW_H
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#include "hb.h"
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HB_BEGIN_DECLS
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/**
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* hb_draw_state_t
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* @path_open: Whether there is an open path
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* @path_start_x: X component of the start of current path
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* @path_start_y: Y component of the start of current path
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* @current_x: X component of current point
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* @current_y: Y component of current point
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*
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* Current drawing state.
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*
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* Since: 4.0.0
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**/
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typedef struct hb_draw_state_t {
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hb_bool_t path_open;
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float path_start_x;
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float path_start_y;
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float current_x;
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float current_y;
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/*< private >*/
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hb_var_num_t reserved1;
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hb_var_num_t reserved2;
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hb_var_num_t reserved3;
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hb_var_num_t reserved4;
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hb_var_num_t reserved5;
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hb_var_num_t reserved6;
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hb_var_num_t reserved7;
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} hb_draw_state_t;
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/**
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* HB_DRAW_STATE_DEFAULT:
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*
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* The default #hb_draw_state_t at the start of glyph drawing.
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*/
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#define HB_DRAW_STATE_DEFAULT {0, 0.f, 0.f, 0.f, 0.f, {0.}, {0.}, {0.}}
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/**
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* hb_draw_funcs_t:
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*
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* Glyph draw callbacks.
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*
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* #hb_draw_move_to_func_t, #hb_draw_line_to_func_t and
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* #hb_draw_cubic_to_func_t calls are necessary to be defined but we translate
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* #hb_draw_quadratic_to_func_t calls to #hb_draw_cubic_to_func_t if the
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* callback isn't defined.
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*
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* Since: 4.0.0
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**/
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typedef struct hb_draw_funcs_t hb_draw_funcs_t;
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/**
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* hb_draw_move_to_func_t:
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* @dfuncs: draw functions object
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* @draw_data: The data accompanying the draw functions in hb_font_draw_glyph()
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* @st: current draw state
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* @to_x: X component of target point
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* @to_y: Y component of target point
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* @user_data: User data pointer passed to hb_draw_funcs_set_move_to_func()
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*
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* A virtual method for the #hb_draw_funcs_t to perform a "move-to" draw
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* operation.
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*
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* Since: 4.0.0
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*
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**/
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typedef void (*hb_draw_move_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float to_x, float to_y,
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void *user_data);
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/**
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* hb_draw_line_to_func_t:
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* @dfuncs: draw functions object
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* @draw_data: The data accompanying the draw functions in hb_font_draw_glyph()
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* @st: current draw state
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* @to_x: X component of target point
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* @to_y: Y component of target point
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* @user_data: User data pointer passed to hb_draw_funcs_set_line_to_func()
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*
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* A virtual method for the #hb_draw_funcs_t to perform a "line-to" draw
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* operation.
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*
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* Since: 4.0.0
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*
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**/
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typedef void (*hb_draw_line_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float to_x, float to_y,
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void *user_data);
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/**
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* hb_draw_quadratic_to_func_t:
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* @dfuncs: draw functions object
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* @draw_data: The data accompanying the draw functions in hb_font_draw_glyph()
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* @st: current draw state
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* @control_x: X component of control point
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* @control_y: Y component of control point
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* @to_x: X component of target point
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* @to_y: Y component of target point
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* @user_data: User data pointer passed to hb_draw_funcs_set_quadratic_to_func()
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*
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* A virtual method for the #hb_draw_funcs_t to perform a "quadratic-to" draw
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* operation.
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*
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* Since: 4.0.0
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*
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**/
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typedef void (*hb_draw_quadratic_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float control_x, float control_y,
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float to_x, float to_y,
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void *user_data);
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/**
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* hb_draw_cubic_to_func_t:
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* @dfuncs: draw functions object
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* @draw_data: The data accompanying the draw functions in hb_font_draw_glyph()
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* @st: current draw state
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* @control1_x: X component of first control point
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* @control1_y: Y component of first control point
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* @control2_x: X component of second control point
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* @control2_y: Y component of second control point
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* @to_x: X component of target point
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* @to_y: Y component of target point
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* @user_data: User data pointer passed to hb_draw_funcs_set_cubic_to_func()
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*
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* A virtual method for the #hb_draw_funcs_t to perform a "cubic-to" draw
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* operation.
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*
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* Since: 4.0.0
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*
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**/
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typedef void (*hb_draw_cubic_to_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float control1_x, float control1_y,
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float control2_x, float control2_y,
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float to_x, float to_y,
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void *user_data);
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/**
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* hb_draw_close_path_func_t:
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* @dfuncs: draw functions object
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* @draw_data: The data accompanying the draw functions in hb_font_draw_glyph()
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* @st: current draw state
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* @user_data: User data pointer passed to hb_draw_funcs_set_close_path_func()
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*
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* A virtual method for the #hb_draw_funcs_t to perform a "close-path" draw
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* operation.
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*
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* Since: 4.0.0
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*
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**/
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typedef void (*hb_draw_close_path_func_t) (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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void *user_data);
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/**
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* hb_draw_funcs_set_move_to_func:
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* @dfuncs: draw functions object
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* @func: (closure user_data) (destroy destroy) (scope notified): move-to callback
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* @user_data: Data to pass to @func
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* @destroy: (nullable): The function to call when @user_data is not needed anymore
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*
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* Sets move-to callback to the draw functions object.
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*
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* Since: 4.0.0
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**/
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HB_EXTERN void
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hb_draw_funcs_set_move_to_func (hb_draw_funcs_t *dfuncs,
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hb_draw_move_to_func_t func,
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void *user_data, hb_destroy_func_t destroy);
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/**
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* hb_draw_funcs_set_line_to_func:
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* @dfuncs: draw functions object
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* @func: (closure user_data) (destroy destroy) (scope notified): line-to callback
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* @user_data: Data to pass to @func
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* @destroy: (nullable): The function to call when @user_data is not needed anymore
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*
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* Sets line-to callback to the draw functions object.
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*
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* Since: 4.0.0
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**/
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HB_EXTERN void
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hb_draw_funcs_set_line_to_func (hb_draw_funcs_t *dfuncs,
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hb_draw_line_to_func_t func,
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void *user_data, hb_destroy_func_t destroy);
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/**
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* hb_draw_funcs_set_quadratic_to_func:
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* @dfuncs: draw functions object
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* @func: (closure user_data) (destroy destroy) (scope notified): quadratic-to callback
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* @user_data: Data to pass to @func
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* @destroy: (nullable): The function to call when @user_data is not needed anymore
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*
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* Sets quadratic-to callback to the draw functions object.
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*
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* Since: 4.0.0
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**/
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HB_EXTERN void
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hb_draw_funcs_set_quadratic_to_func (hb_draw_funcs_t *dfuncs,
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hb_draw_quadratic_to_func_t func,
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void *user_data, hb_destroy_func_t destroy);
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/**
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* hb_draw_funcs_set_cubic_to_func:
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* @dfuncs: draw functions
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* @func: (closure user_data) (destroy destroy) (scope notified): cubic-to callback
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* @user_data: Data to pass to @func
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* @destroy: (nullable): The function to call when @user_data is not needed anymore
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*
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* Sets cubic-to callback to the draw functions object.
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*
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* Since: 4.0.0
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**/
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HB_EXTERN void
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hb_draw_funcs_set_cubic_to_func (hb_draw_funcs_t *dfuncs,
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hb_draw_cubic_to_func_t func,
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void *user_data, hb_destroy_func_t destroy);
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/**
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* hb_draw_funcs_set_close_path_func:
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* @dfuncs: draw functions object
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* @func: (closure user_data) (destroy destroy) (scope notified): close-path callback
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* @user_data: Data to pass to @func
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* @destroy: (nullable): The function to call when @user_data is not needed anymore
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*
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* Sets close-path callback to the draw functions object.
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*
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* Since: 4.0.0
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**/
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HB_EXTERN void
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hb_draw_funcs_set_close_path_func (hb_draw_funcs_t *dfuncs,
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hb_draw_close_path_func_t func,
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void *user_data, hb_destroy_func_t destroy);
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HB_EXTERN hb_draw_funcs_t *
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hb_draw_funcs_create (void);
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HB_EXTERN hb_draw_funcs_t *
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hb_draw_funcs_get_empty (void);
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HB_EXTERN hb_draw_funcs_t *
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hb_draw_funcs_reference (hb_draw_funcs_t *dfuncs);
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HB_EXTERN void
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hb_draw_funcs_destroy (hb_draw_funcs_t *dfuncs);
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HB_EXTERN hb_bool_t
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hb_draw_funcs_set_user_data (hb_draw_funcs_t *dfuncs,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy,
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hb_bool_t replace);
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HB_EXTERN void *
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hb_draw_funcs_get_user_data (const hb_draw_funcs_t *dfuncs,
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hb_user_data_key_t *key);
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HB_EXTERN void
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hb_draw_funcs_make_immutable (hb_draw_funcs_t *dfuncs);
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HB_EXTERN hb_bool_t
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hb_draw_funcs_is_immutable (hb_draw_funcs_t *dfuncs);
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HB_EXTERN void
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hb_draw_move_to (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float to_x, float to_y);
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HB_EXTERN void
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hb_draw_line_to (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float to_x, float to_y);
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HB_EXTERN void
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hb_draw_quadratic_to (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float control_x, float control_y,
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float to_x, float to_y);
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HB_EXTERN void
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hb_draw_cubic_to (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st,
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float control1_x, float control1_y,
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float control2_x, float control2_y,
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float to_x, float to_y);
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HB_EXTERN void
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hb_draw_close_path (hb_draw_funcs_t *dfuncs, void *draw_data,
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hb_draw_state_t *st);
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HB_END_DECLS
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#endif /* HB_DRAW_H */
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