harfbuzz/src/hb-paint-extents.cc

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/*
* Copyright © 2022 Behdad Esfahbod
*
* 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
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#include "hb-paint-extents.hh"
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#include "hb-draw.h"
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#include "hb-machinery.hh"
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/*
* This file implements bounds-extraction as well as boundedness
* computation of COLRv1 fonts as described in:
*
* https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness
*/
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static void
hb_paint_extents_push_transform (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
float xx, float yx,
float xy, float yy,
float dx, float dy,
void *user_data HB_UNUSED)
{
hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->push_transform (hb_transform_t {xx, yx, xy, yy, dx, dy});
}
static void
hb_paint_extents_pop_transform (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
void *user_data HB_UNUSED)
{
hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->pop_transform ();
}
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static void
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hb_draw_extents_move_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
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void *data,
hb_draw_state_t *st,
float to_x, float to_y,
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void *user_data HB_UNUSED)
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{
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hb_extents_t *extents = (hb_extents_t *) data;
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extents->add_point (to_x, to_y);
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}
static void
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hb_draw_extents_line_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
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void *data,
hb_draw_state_t *st,
float to_x, float to_y,
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void *user_data HB_UNUSED)
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{
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hb_extents_t *extents = (hb_extents_t *) data;
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extents->add_point (to_x, to_y);
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}
static void
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hb_draw_extents_quadratic_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *data,
hb_draw_state_t *st,
float control_x, float control_y,
float to_x, float to_y,
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void *user_data HB_UNUSED)
{
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hb_extents_t *extents = (hb_extents_t *) data;
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extents->add_point (control_x, control_y);
extents->add_point (to_x, to_y);
}
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static void
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hb_draw_extents_cubic_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
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void *data,
hb_draw_state_t *st,
float control1_x, float control1_y,
float control2_x, float control2_y,
float to_x, float to_y,
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void *user_data HB_UNUSED)
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{
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hb_extents_t *extents = (hb_extents_t *) data;
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extents->add_point (control1_x, control1_y);
extents->add_point (control2_x, control2_y);
extents->add_point (to_x, to_y);
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}
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static inline void free_static_draw_extents_funcs ();
static struct hb_draw_extents_funcs_lazy_loader_t : hb_draw_funcs_lazy_loader_t<hb_draw_extents_funcs_lazy_loader_t>
{
static hb_draw_funcs_t *create ()
{
hb_draw_funcs_t *funcs = hb_draw_funcs_create ();
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hb_draw_funcs_set_move_to_func (funcs, hb_draw_extents_move_to, nullptr, nullptr);
hb_draw_funcs_set_line_to_func (funcs, hb_draw_extents_line_to, nullptr, nullptr);
hb_draw_funcs_set_quadratic_to_func (funcs, hb_draw_extents_quadratic_to, nullptr, nullptr);
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hb_draw_funcs_set_cubic_to_func (funcs, hb_draw_extents_cubic_to, nullptr, nullptr);
hb_draw_funcs_make_immutable (funcs);
hb_atexit (free_static_draw_extents_funcs);
return funcs;
}
} static_draw_extents_funcs;
static inline
void free_static_draw_extents_funcs ()
{
static_draw_extents_funcs.free_instance ();
}
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static hb_draw_funcs_t *
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hb_draw_extents_get_funcs ()
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{
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return static_draw_extents_funcs.get_unconst ();
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}
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static void
hb_paint_extents_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font,
void *user_data HB_UNUSED)
{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
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hb_extents_t extents;
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hb_draw_funcs_t *draw_extent_funcs = hb_draw_extents_get_funcs ();
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hb_font_draw_glyph (font, glyph, draw_extent_funcs, &extents);
c->push_clip (extents);
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}
static void
hb_paint_extents_push_clip_rectangle (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
float xmin, float ymin, float xmax, float ymax,
void *user_data)
{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
hb_extents_t extents = {xmin, ymin, xmax, ymax};
c->push_clip (extents);
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}
static void
hb_paint_extents_pop_clip (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
void *user_data HB_UNUSED)
{
hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->pop_clip ();
}
static void
hb_paint_extents_push_group (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
void *user_data HB_UNUSED)
{
hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->push_group ();
}
static void
hb_paint_extents_pop_group (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
hb_paint_composite_mode_t mode,
void *user_data HB_UNUSED)
{
hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->pop_group (mode);
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}
static hb_bool_t
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hb_paint_extents_paint_image (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
hb_blob_t *blob HB_UNUSED,
unsigned int width HB_UNUSED,
unsigned int height HB_UNUSED,
hb_tag_t format HB_UNUSED,
float slant HB_UNUSED,
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hb_glyph_extents_t *glyph_extents,
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void *user_data HB_UNUSED)
{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
hb_extents_t extents = {(float) glyph_extents->x_bearing,
(float) glyph_extents->y_bearing + glyph_extents->height,
(float) glyph_extents->x_bearing + glyph_extents->width,
(float) glyph_extents->y_bearing};
c->push_clip (extents);
c->paint ();
c->pop_clip ();
return true;
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}
static void
hb_paint_extents_paint_color (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
hb_bool_t use_foreground HB_UNUSED,
hb_color_t color HB_UNUSED,
void *user_data HB_UNUSED)
{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->paint ();
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}
static void
hb_paint_extents_paint_linear_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
hb_color_line_t *color_line HB_UNUSED,
float x0 HB_UNUSED, float y0 HB_UNUSED,
float x1 HB_UNUSED, float y1 HB_UNUSED,
float x2 HB_UNUSED, float y2 HB_UNUSED,
void *user_data HB_UNUSED)
{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->paint ();
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}
static void
hb_paint_extents_paint_radial_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
hb_color_line_t *color_line HB_UNUSED,
float x0 HB_UNUSED, float y0 HB_UNUSED, float r0 HB_UNUSED,
float x1 HB_UNUSED, float y1 HB_UNUSED, float r1 HB_UNUSED,
void *user_data HB_UNUSED)
{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->paint ();
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}
static void
hb_paint_extents_paint_sweep_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
hb_color_line_t *color_line HB_UNUSED,
float cx HB_UNUSED, float cy HB_UNUSED,
float start_angle HB_UNUSED,
float end_angle HB_UNUSED,
void *user_data HB_UNUSED)
{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
c->paint ();
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}
static inline void free_static_paint_extents_funcs ();
static struct hb_paint_extents_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<hb_paint_extents_funcs_lazy_loader_t>
{
static hb_paint_funcs_t *create ()
{
hb_paint_funcs_t *funcs = hb_paint_funcs_create ();
hb_paint_funcs_set_push_transform_func (funcs, hb_paint_extents_push_transform, nullptr, nullptr);
hb_paint_funcs_set_pop_transform_func (funcs, hb_paint_extents_pop_transform, nullptr, nullptr);
hb_paint_funcs_set_push_clip_glyph_func (funcs, hb_paint_extents_push_clip_glyph, nullptr, nullptr);
hb_paint_funcs_set_push_clip_rectangle_func (funcs, hb_paint_extents_push_clip_rectangle, nullptr, nullptr);
hb_paint_funcs_set_pop_clip_func (funcs, hb_paint_extents_pop_clip, nullptr, nullptr);
hb_paint_funcs_set_push_group_func (funcs, hb_paint_extents_push_group, nullptr, nullptr);
hb_paint_funcs_set_pop_group_func (funcs, hb_paint_extents_pop_group, nullptr, nullptr);
hb_paint_funcs_set_color_func (funcs, hb_paint_extents_paint_color, nullptr, nullptr);
hb_paint_funcs_set_image_func (funcs, hb_paint_extents_paint_image, nullptr, nullptr);
hb_paint_funcs_set_linear_gradient_func (funcs, hb_paint_extents_paint_linear_gradient, nullptr, nullptr);
hb_paint_funcs_set_radial_gradient_func (funcs, hb_paint_extents_paint_radial_gradient, nullptr, nullptr);
hb_paint_funcs_set_sweep_gradient_func (funcs, hb_paint_extents_paint_sweep_gradient, nullptr, nullptr);
hb_paint_funcs_make_immutable (funcs);
hb_atexit (free_static_paint_extents_funcs);
return funcs;
}
} static_paint_extents_funcs;
static inline
void free_static_paint_extents_funcs ()
{
static_paint_extents_funcs.free_instance ();
}
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hb_paint_funcs_t *
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hb_paint_extents_get_funcs ()
{
return static_paint_extents_funcs.get_unconst ();
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}
#endif