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/*
* pangocairo-user-font.c: User font handling
*
* Copyright (C) 2022 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "pango-features.h"
#include "pangocairo-private.h"
#include "pango-userfont-private.h"
#include "pango-userface-private.h"
#include <hb-ot.h>
static cairo_user_data_key_t cairo_user_data;
static cairo_status_t
render_func (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *extents)
{
cairo_font_face_t *font_face;
Pango2Font *font;
Pango2UserFace *face;
hb_glyph_extents_t glyph_extents;
hb_position_t h_advance;
hb_position_t v_advance;
gboolean is_color;
font_face = cairo_scaled_font_get_font_face (scaled_font);
font = cairo_font_face_get_user_data (font_face, &cairo_user_data);
face = PANGO2_USER_FACE (font->face);
extents->x_bearing = 0;
extents->y_bearing = 0;
extents->width = 0;
extents->height = 0;
extents->x_advance = 0;
extents->y_advance = 0;
if (!face->glyph_info_func (face, 1024,
(hb_codepoint_t)glyph,
&glyph_extents,
&h_advance, &v_advance,
&is_color,
face->user_data))
{
return CAIRO_STATUS_USER_FONT_ERROR;
}
extents->x_bearing = glyph_extents.x_bearing / 1024.;
extents->y_bearing = - glyph_extents.y_bearing / 1024.;
extents->width = glyph_extents.width / 1024.;
extents->height = - glyph_extents.height / 1024.;
extents->x_advance = h_advance / 1024.;
extents->y_advance = v_advance / 1024.;
if (!face->render_func (face, font->size,
(hb_codepoint_t)glyph,
face->user_data,
"cairo",
cr))
{
return CAIRO_STATUS_USER_FONT_ERROR;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
init_func (cairo_scaled_font_t *scaled_font,
cairo_t *cr,
cairo_font_extents_t *extents)
{
cairo_font_face_t *cairo_face;
Pango2Font *font;
Pango2UserFace *face;
hb_font_extents_t font_extents;
cairo_face = cairo_scaled_font_get_font_face (scaled_font);
font = cairo_font_face_get_user_data (cairo_face, &cairo_user_data);
face = (Pango2UserFace *) pango2_font_get_face (font);
face->font_info_func (face,
pango2_font_get_size (font),
&font_extents,
face->user_data);
extents->ascent = font_extents.ascender / (font_extents.ascender + font_extents.descender);
extents->descent = font_extents.descender / (font_extents.ascender + font_extents.descender);
return CAIRO_STATUS_SUCCESS;
}
cairo_font_face_t *
create_cairo_user_font_face (Pango2Font *font)
{
cairo_font_face_t *cairo_face;
cairo_face = cairo_user_font_face_create ();
cairo_font_face_set_user_data (cairo_face, &cairo_user_data, font, NULL);
cairo_user_font_face_set_init_func (cairo_face, init_func);
cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_func);
return cairo_face;
}
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