400 lines
10 KiB
C++
400 lines
10 KiB
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.
|
|
*/
|
|
|
|
#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.
|
|
**/
|
|
|
|
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_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_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
|