harfbuzz/src/hb-paint.cc

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/*
* Copyright © 2022 Matthias Clasen
*
* 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_PAINT
#include "hb-paint.hh"
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/**
* SECTION: hb-paint
* @title: hb-paint
* @short_description: Glyph painting
* @include: hb.h
*
* Functions for painting (extracting) glyph color layers.
**/
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static void
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hb_paint_push_transform_nil (hb_paint_funcs_t *funcs, void *paint_data,
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float xx, float yx,
float xy, float yy,
float dx, float dy,
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void *user_data) {}
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static void
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hb_paint_pop_transform_nil (hb_paint_funcs_t *funcs, void *paint_data,
void *user_data) {}
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static void
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hb_paint_push_clip_glyph_nil (hb_paint_funcs_t *funcs, void *paint_data,
hb_codepoint_t glyph,
void *user_data) {}
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static void
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hb_paint_push_clip_rect_nil (hb_paint_funcs_t *funcs, void *paint_data,
float xmin, float ymin, float xmax, float ymax,
void *user_data) {}
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static void
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hb_paint_pop_clip_nil (hb_paint_funcs_t *funcs, void *paint_data,
void *user_data) {}
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static void
hb_paint_color_nil (hb_paint_funcs_t *funcs, void *paint_data,
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unsigned int color_index,
float alpha,
void *user_data) {}
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static void
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hb_paint_linear_gradient_nil (hb_paint_funcs_t *funcs, void *paint_data,
hb_color_line_t *color_line,
float x0, float y0,
float x1, float y1,
float x2, float y2,
void *user_data) {}
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static void
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hb_paint_radial_gradient_nil (hb_paint_funcs_t *funcs, void *paint_data,
hb_color_line_t *color_line,
float x0, float y0, float r0,
float x1, float y1, float r1,
void *user_data) {}
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static void
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hb_paint_sweep_gradient_nil (hb_paint_funcs_t *funcs, void *paint_data,
hb_color_line_t *color_line,
float x0, float y0,
float start_angle,
float end_angle,
void *user_data) {}
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static void
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hb_paint_push_group_nil (hb_paint_funcs_t *funcs, void *paint_data,
void *user_data) {}
static void
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hb_paint_pop_group_nil (hb_paint_funcs_t *funcs, void *paint_data,
hb_paint_composite_mode_t mode,
void *user_data) {}
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static bool
_hb_paint_funcs_set_preamble (hb_paint_funcs_t *funcs,
bool func_is_null,
void **user_data,
hb_destroy_func_t *destroy)
{
if (hb_object_is_immutable (funcs))
{
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_paint_funcs_set_middle (hb_paint_funcs_t *funcs,
void *user_data,
hb_destroy_func_t destroy)
{
if (user_data && !funcs->user_data)
{
funcs->user_data = (decltype (funcs->user_data)) hb_calloc (1, sizeof (*funcs->user_data));
if (unlikely (!funcs->user_data))
goto fail;
}
if (destroy && !funcs->destroy)
{
funcs->destroy = (decltype (funcs->destroy)) hb_calloc (1, sizeof (*funcs->destroy));
if (unlikely (!funcs->destroy))
goto fail;
}
return true;
fail:
if (destroy)
(destroy) (user_data);
return false;
}
#define HB_PAINT_FUNC_IMPLEMENT(name) \
\
void \
hb_paint_funcs_set_##name##_func (hb_paint_funcs_t *funcs, \
hb_paint_##name##_func_t func, \
void *user_data, \
hb_destroy_func_t destroy) \
{ \
if (!_hb_paint_funcs_set_preamble (funcs, !func, &user_data, &destroy)) \
return; \
\
if (funcs->destroy && funcs->destroy->name) \
funcs->destroy->name (!funcs->user_data ? nullptr : funcs->user_data->name);\
\
if (!_hb_paint_funcs_set_middle (funcs, user_data, destroy)) \
return; \
\
if (func) \
funcs->func.name = func; \
else \
funcs->func.name = hb_paint_##name##_nil; \
\
if (funcs->user_data) \
funcs->user_data->name = user_data; \
if (funcs->destroy) \
funcs->destroy->name = destroy; \
}
HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_PAINT_FUNC_IMPLEMENT
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/**
* hb_paint_funcs_create:
*
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* Creates a new #hb_paint_funcs_t structure of paint functions.
* Returns value: (transfer full): the paint-functions structure
*
* Since: REPLACEME
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*/
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hb_paint_funcs_t *
hb_paint_funcs_create ()
{
hb_paint_funcs_t *funcs;
if (unlikely (!(funcs = hb_object_create<hb_paint_funcs_t> ())))
return const_cast<hb_paint_funcs_t *> (&Null (hb_paint_funcs_t));
funcs->func = Null (hb_paint_funcs_t).func;
return funcs;
}
DEFINE_NULL_INSTANCE (hb_paint_funcs_t) =
{
HB_OBJECT_HEADER_STATIC,
{
#define HB_PAINT_FUNC_IMPLEMENT(name) hb_paint_##name##_nil,
HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_PAINT_FUNC_IMPLEMENT
}
};
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/**
* hb_paint_funcs_reference: (skip)
* @funcs: The paint-functions structure
*
* Increases the reference count on a paint-functions structure.
*
* Return value: The paint-functions structure
*
* Since: REPLACEME
*/
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hb_paint_funcs_t *
hb_paint_funcs_reference (hb_paint_funcs_t *funcs)
{
return hb_object_reference (funcs);
}
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/**
* hb_paint_funcs_destroy: (skip)
* @funcs: The paint-functions structure
*
* Decreases the reference count on a paint-functions structure.
*
* When the reference count reaches zero, the structure
* is destroyed, freeing all memory.
*
* Since: REPLACEME
*/
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void
hb_paint_funcs_destroy (hb_paint_funcs_t *funcs)
{
if (!hb_object_destroy (funcs)) return;
if (funcs->destroy)
{
#define HB_PAINT_FUNC_IMPLEMENT(name) \
if (funcs->destroy->name) funcs->destroy->name (!funcs->user_data ? nullptr : funcs->user_data->name);
HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_PAINT_FUNC_IMPLEMENT
}
hb_free (funcs->destroy);
hb_free (funcs->user_data);
hb_free (funcs);
}
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/**
* hb_paint_funcs_make_immutable:
* @funcs: The paint-functions structure
*
* Makes a paint-functions structure immutable.
*
* After this call, all attempts to set one of the callbacks
* on @funcs will fail.
*
* Since: REPLACEME
*/
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void
hb_paint_funcs_make_immutable (hb_paint_funcs_t *funcs)
{
if (hb_object_is_immutable (funcs))
return;
hb_object_make_immutable (funcs);
}
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/**
* hb_paint_funcs_is_immutable:
* @funcs: The paint-functions structure
*
* Tests whether a paint-functions structure is immutable.
*
* Return value: `true` if @funcs is immutable, `false` otherwise
*
* Since: REPLACEME
*/
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hb_bool_t
hb_paint_funcs_is_immutable (hb_paint_funcs_t *funcs)
{
return hb_object_is_immutable (funcs);
}
void
hb_paint_push_transform (hb_paint_funcs_t *funcs, void *paint_data,
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float xx, float yx,
float xy, float yy,
float dx, float dy)
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{
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funcs->push_transform (paint_data, xx, yx, xy, yy, dx, dy);
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}
void
hb_paint_pop_transform (hb_paint_funcs_t *funcs, void *paint_data)
{
funcs->pop_transform (paint_data);
}
void
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hb_paint_push_clip_glyph (hb_paint_funcs_t *funcs, void *paint_data,
hb_codepoint_t glyph)
{
funcs->push_clip_glyph (paint_data, glyph);
}
void
hb_paint_push_clip_rect (hb_paint_funcs_t *funcs, void *paint_data,
float xmin, float ymin, float xmax, float ymax)
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{
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funcs->push_clip_rect (paint_data, xmin, ymin, xmax, ymax);
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}
void
hb_paint_pop_clip (hb_paint_funcs_t *funcs, void *paint_data)
{
funcs->pop_clip (paint_data);
}
void
hb_paint_color (hb_paint_funcs_t *funcs, void *paint_data,
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unsigned int color_index,
float alpha)
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{
funcs->color (paint_data, color_index, alpha);
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}
void
hb_paint_linear_gradient (hb_paint_funcs_t *funcs, void *paint_data,
hb_color_line_t *color_line,
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float x0, float y0,
float x1, float y1,
float x2, float y2)
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{
funcs->linear_gradient (paint_data, color_line, x0, y0, x1, y1, x2, y2);
}
void
hb_paint_radial_gradient (hb_paint_funcs_t *funcs, void *paint_data,
hb_color_line_t *color_line,
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float x0, float y0, float r0,
float x1, float y1, float r1)
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{
funcs->radial_gradient (paint_data, color_line, x0, y0, r0, y1, x1, r1);
}
void
hb_paint_sweep_gradient (hb_paint_funcs_t *funcs, void *paint_data,
hb_color_line_t *color_line,
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float x0, float y0,
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float start_angle, float end_angle)
{
funcs->sweep_gradient (paint_data, color_line, x0, y0, start_angle, end_angle);
}
void
hb_paint_push_group (hb_paint_funcs_t *funcs, void *paint_data)
{
funcs->push_group (paint_data);
}
void
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hb_paint_pop_group (hb_paint_funcs_t *funcs, void *paint_data,
hb_paint_composite_mode_t mode)
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{
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funcs->pop_group (paint_data, mode);
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}
#endif