459 lines
12 KiB
C++
459 lines
12 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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#include "hb.hh"
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#ifndef HB_NO_DRAW
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#include "hb-draw.hh"
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/**
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* SECTION:hb-draw
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* @title: hb-draw
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* @short_description: Glyph drawing
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* @include: hb.h
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*
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* Functions for drawing (extracting) glyph shapes.
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*
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* The #hb_draw_funcs_t struct can be used with hb_font_draw_glyph().
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**/
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static void
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hb_draw_move_to_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED,
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hb_draw_state_t *st HB_UNUSED,
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float to_x HB_UNUSED, float to_y HB_UNUSED,
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void *user_data HB_UNUSED) {}
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static void
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hb_draw_line_to_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED,
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hb_draw_state_t *st HB_UNUSED,
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float to_x HB_UNUSED, float to_y HB_UNUSED,
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void *user_data HB_UNUSED) {}
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static void
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hb_draw_quadratic_to_nil (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 HB_UNUSED)
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{
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#define HB_ONE_THIRD 0.33333333f
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dfuncs->emit_cubic_to (draw_data, *st,
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(st->current_x + 2.f * control_x) * HB_ONE_THIRD,
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(st->current_y + 2.f * control_y) * HB_ONE_THIRD,
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(to_x + 2.f * control_x) * HB_ONE_THIRD,
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(to_y + 2.f * control_y) * HB_ONE_THIRD,
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to_x, to_y);
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#undef HB_ONE_THIRD
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}
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static void
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hb_draw_cubic_to_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED,
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hb_draw_state_t *st HB_UNUSED,
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float control1_x HB_UNUSED, float control1_y HB_UNUSED,
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float control2_x HB_UNUSED, float control2_y HB_UNUSED,
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float to_x HB_UNUSED, float to_y HB_UNUSED,
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void *user_data HB_UNUSED) {}
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static void
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hb_draw_close_path_nil (hb_draw_funcs_t *dfuncs HB_UNUSED, void *draw_data HB_UNUSED,
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hb_draw_state_t *st HB_UNUSED,
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void *user_data HB_UNUSED) {}
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static bool
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_hb_draw_funcs_set_preamble (hb_draw_funcs_t *dfuncs,
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bool func_is_null,
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void **user_data,
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hb_destroy_func_t *destroy)
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{
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if (hb_object_is_immutable (dfuncs))
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{
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if (*destroy)
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(*destroy) (*user_data);
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return false;
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}
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if (func_is_null)
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{
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if (*destroy)
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(*destroy) (*user_data);
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*destroy = nullptr;
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*user_data = nullptr;
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}
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return true;
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}
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static bool
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_hb_draw_funcs_set_middle (hb_draw_funcs_t *dfuncs,
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void *user_data,
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hb_destroy_func_t destroy)
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{
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if (user_data && !dfuncs->user_data)
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{
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dfuncs->user_data = (decltype (dfuncs->user_data)) hb_calloc (1, sizeof (*dfuncs->user_data));
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if (unlikely (!dfuncs->user_data))
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goto fail;
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}
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if (destroy && !dfuncs->destroy)
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{
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dfuncs->destroy = (decltype (dfuncs->destroy)) hb_calloc (1, sizeof (*dfuncs->destroy));
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if (unlikely (!dfuncs->destroy))
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goto fail;
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}
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return true;
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fail:
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if (destroy)
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(destroy) (user_data);
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return false;
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}
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#define HB_DRAW_FUNC_IMPLEMENT(name) \
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\
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void \
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hb_draw_funcs_set_##name##_func (hb_draw_funcs_t *dfuncs, \
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hb_draw_##name##_func_t func, \
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void *user_data, \
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hb_destroy_func_t destroy) \
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{ \
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if (!_hb_draw_funcs_set_preamble (dfuncs, !func, &user_data, &destroy))\
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return; \
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\
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if (dfuncs->destroy && dfuncs->destroy->name) \
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dfuncs->destroy->name (!dfuncs->user_data ? nullptr : dfuncs->user_data->name); \
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\
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if (!_hb_draw_funcs_set_middle (dfuncs, user_data, destroy)) \
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return; \
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\
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if (func) \
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dfuncs->func.name = func; \
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else \
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dfuncs->func.name = hb_draw_##name##_nil; \
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\
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if (dfuncs->user_data) \
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dfuncs->user_data->name = user_data; \
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if (dfuncs->destroy) \
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dfuncs->destroy->name = destroy; \
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}
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HB_DRAW_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_DRAW_FUNC_IMPLEMENT
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/**
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* hb_draw_funcs_create:
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*
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* Creates a new draw callbacks object.
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*
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* Return value: (transfer full):
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* A newly allocated #hb_draw_funcs_t with a reference count of 1. The initial
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* reference count should be released with hb_draw_funcs_destroy when you are
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* done using the #hb_draw_funcs_t. This function never returns `NULL`. If
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* memory cannot be allocated, a special singleton #hb_draw_funcs_t object will
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* be returned.
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*
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* Since: 4.0.0
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**/
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hb_draw_funcs_t *
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hb_draw_funcs_create ()
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{
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hb_draw_funcs_t *dfuncs;
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if (unlikely (!(dfuncs = hb_object_create<hb_draw_funcs_t> ())))
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return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t));
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dfuncs->func = Null (hb_draw_funcs_t).func;
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return dfuncs;
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}
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DEFINE_NULL_INSTANCE (hb_draw_funcs_t) =
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{
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HB_OBJECT_HEADER_STATIC,
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{
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#define HB_DRAW_FUNC_IMPLEMENT(name) hb_draw_##name##_nil,
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HB_DRAW_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_DRAW_FUNC_IMPLEMENT
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}
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};
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/**
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* hb_draw_funcs_get_empty:
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*
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* Fetches the singleton empty draw-functions structure.
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*
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* Return value: (transfer full): The empty draw-functions structure
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*
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* XSince: REPLACEME
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**/
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hb_draw_funcs_t *
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hb_draw_funcs_get_empty ()
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{
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return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t));
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}
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/**
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* hb_draw_funcs_reference: (skip)
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* @dfuncs: draw functions
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*
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* Increases the reference count on @dfuncs by one.
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*
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* This prevents @dfuncs from being destroyed until a matching
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* call to hb_draw_funcs_destroy() is made.
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*
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* Return value: (transfer full):
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* The referenced #hb_draw_funcs_t.
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*
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* Since: 4.0.0
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**/
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hb_draw_funcs_t *
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hb_draw_funcs_reference (hb_draw_funcs_t *dfuncs)
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{
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return hb_object_reference (dfuncs);
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}
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/**
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* hb_draw_funcs_destroy: (skip)
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* @dfuncs: draw functions
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*
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* Deallocate the @dfuncs.
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* Decreases the reference count on @dfuncs by one. If the result is zero, then
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* @dfuncs and all associated resources are freed. See hb_draw_funcs_reference().
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*
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* Since: 4.0.0
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**/
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void
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hb_draw_funcs_destroy (hb_draw_funcs_t *dfuncs)
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{
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if (!hb_object_destroy (dfuncs)) return;
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if (dfuncs->destroy)
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{
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#define HB_DRAW_FUNC_IMPLEMENT(name) \
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if (dfuncs->destroy->name) dfuncs->destroy->name (!dfuncs->user_data ? nullptr : dfuncs->user_data->name);
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HB_DRAW_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_DRAW_FUNC_IMPLEMENT
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}
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hb_free (dfuncs->destroy);
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hb_free (dfuncs->user_data);
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hb_free (dfuncs);
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}
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/**
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* hb_draw_funcs_set_user_data: (skip)
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* @dfuncs: The draw-functions structure
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* @key: The user-data key
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* @data: A pointer to the user data
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* @destroy: (nullable): A callback to call when @data is not needed anymore
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* @replace: Whether to replace an existing data with the same key
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*
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* Attaches a user-data key/data pair to the specified draw-functions structure.
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*
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* Return value: `true` if success, `false` otherwise
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*
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* XSince: REPLACEME
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**/
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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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{
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return hb_object_set_user_data (dfuncs, key, data, destroy, replace);
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}
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/**
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* hb_draw_funcs_get_user_data: (skip)
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* @dfuncs: The draw-functions structure
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* @key: The user-data key to query
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*
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* Fetches the user-data associated with the specified key,
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* attached to the specified draw-functions structure.
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*
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* Return value: (transfer none): A pointer to the user data
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*
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* XSince: REPLACEME
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**/
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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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{
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return hb_object_get_user_data (dfuncs, key);
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}
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/**
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* hb_draw_funcs_make_immutable:
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* @dfuncs: draw functions
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*
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* Makes @dfuncs object immutable.
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*
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* Since: 4.0.0
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**/
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void
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hb_draw_funcs_make_immutable (hb_draw_funcs_t *dfuncs)
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{
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if (hb_object_is_immutable (dfuncs))
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return;
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hb_object_make_immutable (dfuncs);
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}
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/**
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* hb_draw_funcs_is_immutable:
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* @dfuncs: draw functions
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*
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* Checks whether @dfuncs is immutable.
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*
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* Return value: `true` if @dfuncs is immutable, `false` otherwise
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*
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* Since: 4.0.0
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**/
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hb_bool_t
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hb_draw_funcs_is_immutable (hb_draw_funcs_t *dfuncs)
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{
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return hb_object_is_immutable (dfuncs);
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}
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/**
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* hb_draw_move_to:
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* @dfuncs: draw functions
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* @draw_data: associated draw data passed by the caller
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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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*
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* Perform a "move-to" draw operation.
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*
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* Since: 4.0.0
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**/
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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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{
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dfuncs->move_to (draw_data, *st,
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to_x, to_y);
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}
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/**
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* hb_draw_line_to:
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* @dfuncs: draw functions
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* @draw_data: associated draw data passed by the caller
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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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*
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* Perform a "line-to" draw operation.
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*
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* Since: 4.0.0
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**/
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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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{
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dfuncs->line_to (draw_data, *st,
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to_x, to_y);
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}
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/**
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* hb_draw_quadratic_to:
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* @dfuncs: draw functions
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* @draw_data: associated draw data passed by the caller
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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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*
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* Perform a "quadratic-to" draw operation.
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*
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* Since: 4.0.0
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**/
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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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{
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dfuncs->quadratic_to (draw_data, *st,
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control_x, control_y,
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to_x, to_y);
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}
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/**
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* hb_draw_cubic_to:
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* @dfuncs: draw functions
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* @draw_data: associated draw data passed by the caller
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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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*
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* Perform a "cubic-to" draw operation.
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*
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* Since: 4.0.0
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**/
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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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{
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dfuncs->cubic_to (draw_data, *st,
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control1_x, control1_y,
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control2_x, control2_y,
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to_x, to_y);
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}
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/**
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* hb_draw_close_path:
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* @dfuncs: draw functions
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* @draw_data: associated draw data passed by the caller
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* @st: current draw state
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*
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* Perform a "close-path" draw operation.
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*
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* Since: 4.0.0
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**/
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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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{
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dfuncs->close_path (draw_data, *st);
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}
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#endif
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