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Get outline extents manually

This commit is contained in:
Matthias Clasen 2022-12-23 18:33:53 -05:00
parent 55b7af6b62
commit 79229cea17
1 changed files with 89 additions and 7 deletions
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94
src/hb-paint-extents.hh
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@ -27,8 +27,17 @@
#include "hb.hh"
#include "hb-paint.hh"
#include "hb-draw.h"
#ifndef MIN
#define MIN(x,y) ((x) < (y) ? (x) : (y))
#endif
#ifndef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
#endif
typedef struct hb_extents_t
{
float xmin, ymin, xmax, ymax;
@ -288,6 +297,80 @@ hb_paint_extents_pop_transform (hb_paint_funcs_t *funcs HB_UNUSED,
c->pop_transform ();
}
static void
add_point (hb_extents_t *extents,
float x, float y)
{
if (extents->xmax < extents->xmin)
{
extents->xmin = extents->xmax = x;
extents->ymin = extents->ymax = y;
}
else
{
extents->xmin = MIN (extents->xmin, x);
extents->ymin = MIN (extents->ymin, y);
extents->xmax = MAX (extents->xmax, x);
extents->ymax = MAX (extents->ymax, y);
}
}
static void
move_to (hb_draw_funcs_t *dfuncs,
void *data,
hb_draw_state_t *st,
float to_x, float to_y,
void *)
{
hb_extents_t *extents = (hb_extents_t *)data;
add_point (extents, to_x, to_y);
}
static void
line_to (hb_draw_funcs_t *dfuncs,
void *data,
hb_draw_state_t *st,
float to_x, float to_y,
void *)
{
hb_extents_t *extents = (hb_extents_t *)data;
add_point (extents, to_x, to_y);
}
static void
cubic_to (hb_draw_funcs_t *dfuncs,
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,
void *)
{
hb_extents_t *extents = (hb_extents_t *)data;
add_point (extents, control1_x, control1_y);
add_point (extents, control2_x, control2_y);
add_point (extents, to_x, to_y);
}
static void
close_path (hb_draw_funcs_t *dfuncs,
void *data,
hb_draw_state_t *st,
void *)
{
}
static hb_draw_funcs_t *
hb_draw_extent_get_funcs ()
{
hb_draw_funcs_t *funcs = hb_draw_funcs_create ();
hb_draw_funcs_set_move_to_func (funcs, move_to, nullptr, nullptr);
hb_draw_funcs_set_line_to_func (funcs, line_to, nullptr, nullptr);
hb_draw_funcs_set_cubic_to_func (funcs, cubic_to, nullptr, nullptr);
hb_draw_funcs_set_close_path_func (funcs, close_path, nullptr, nullptr);
return funcs;
}
static void
hb_paint_extents_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data,
@ -297,12 +380,11 @@ hb_paint_extents_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED,
{
hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
hb_glyph_extents_t glyph_extents;
hb_font_get_glyph_extents (font, glyph, &glyph_extents);
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};
hb_extents_t extents = { 0, 0, -1, -1 };
hb_draw_funcs_t *draw_extent_funcs = hb_draw_extent_get_funcs ();
hb_font_draw_glyph (font, glyph, draw_extent_funcs, &extents);
hb_draw_funcs_destroy (draw_extent_funcs);
c->push_clip (extents);
}