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/*
* pangocairo-ft-font.c: Freetype 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-hbfont-private.h"
#include "pango-hbface-private.h"
#ifdef CAIRO_HAS_FT_FONT
#include <hb-ot.h>
#include <cairo-ft.h>
#include <freetype/ftmm.h>
/* Get the font data as a blob. Either, the hb_face_t was
* created from a blob to begin with, or we receate one using
* hb_face_builder_create(). Unfortunately we can't rely on
* hb_face_get_table_tags(), so we just have to list all possible
* OpenType tables here and try them all.
*
* This is not ideal from a memory perspective, but cairo does
* not have a scaled font implementation that takes individual
* tables.
*/
static hb_blob_t *
face_get_blob (hb_face_t *face)
{
hb_blob_t *blob;
hb_face_t *builder;
static const hb_tag_t ot_tables[] = {
HB_TAG ('a','v','a','r'),
HB_TAG ('B','A','S','E'),
HB_TAG ('C','B','D','T'),
HB_TAG ('C','B','L','C'),
HB_TAG ('C','F','F',' '),
HB_TAG ('C','F','F','2'),
HB_TAG ('c','m','a','p'),
HB_TAG ('C','O','L','R'),
HB_TAG ('C','P','A','L'),
HB_TAG ('c','v','a','r'),
HB_TAG ('c','v','t',' '),
HB_TAG ('D','S','I','G'),
HB_TAG ('E','B','D','T'),
HB_TAG ('E','B','L','C'),
HB_TAG ('E','B','S','C'),
HB_TAG ('f','p','g','m'),
HB_TAG ('f','v','a','r'),
HB_TAG ('g','a','s','p'),
HB_TAG ('G','D','E','F'),
HB_TAG ('g','l','y','f'),
HB_TAG ('G','P','O','S'),
HB_TAG ('G','S','U','B'),
HB_TAG ('g','v','a','r'),
HB_TAG ('h','d','m','x'),
HB_TAG ('h','e','a','d'),
HB_TAG ('h','h','e','a'),
HB_TAG ('h','m','t','x'),
HB_TAG ('H','V','A','R'),
HB_TAG ('J','S','T','F'),
HB_TAG ('k','e','r','n'),
HB_TAG ('l','o','c','a'),
HB_TAG ('L','T','S','H'),
HB_TAG ('M','A','T','H'),
HB_TAG ('m','a','x','p'),
HB_TAG ('M','E','R','G'),
HB_TAG ('m','e','t','a'),
HB_TAG ('M','V','A','R'),
HB_TAG ('n','a','m','e'),
HB_TAG ('O','S','/','2'),
HB_TAG ('P','C','L','T'),
HB_TAG ('p','o','s','t'),
HB_TAG ('p','r','e','p'),
HB_TAG ('s','b','i','x'),
HB_TAG ('S','T','A','T'),
HB_TAG ('S','V','G',' '),
HB_TAG ('V','D','M','X'),
HB_TAG ('v','h','e','a'),
HB_TAG ('v','m','t','x'),
HB_TAG ('V','O','R','G'),
HB_TAG ('V','V','A','R'),
};
blob = hb_face_reference_blob (face);
if (blob != hb_blob_get_empty ())
return blob;
builder = hb_face_builder_create ();
for (unsigned int i = 0; i < G_N_ELEMENTS (ot_tables); i++)
{
hb_blob_t *table;
table = hb_face_reference_table (face, ot_tables[i]);
if (table != hb_blob_get_empty ())
{
hb_face_builder_add_table (builder, ot_tables[i], table);
hb_blob_destroy (table);
}
}
blob = hb_face_reference_blob (builder);
hb_face_destroy (builder);
return blob;
}
cairo_font_face_t *
create_cairo_ft_font_face (Pango2Font *font)
{
static FT_Library ft_library;
Pango2HbFace *face = PANGO2_HB_FACE (font->face);
hb_blob_t *blob;
const char *blob_data;
unsigned int blob_length;
FT_Face ft_face;
hb_font_t *hb_font;
hb_face_t *hbface;
unsigned int num_coords;
const int *coords;
cairo_font_face_t *cairo_face;
static const cairo_user_data_key_t key;
static const cairo_user_data_key_t key2;
FT_Error error;
if (g_once_init_enter (&ft_library))
{
FT_Library library;
FT_Init_FreeType (&library);
g_once_init_leave (&ft_library, library);
}
hb_font = pango2_font_get_hb_font (font);
hbface = hb_font_get_face (hb_font);
blob = face_get_blob (hbface);
blob_data = hb_blob_get_data (blob, &blob_length);
if ((error = FT_New_Memory_Face (ft_library,
(const FT_Byte *) blob_data,
blob_length,
hb_face_get_index (face->face),
&ft_face)) != 0)
{
hb_blob_destroy (blob);
g_warning ("FT_New_Memory_Face failed: %d %s", error, FT_Error_String (error));
return NULL;
}
coords = hb_font_get_var_coords_normalized (hb_font, &num_coords);
if (num_coords > 0)
{
FT_Fixed *ft_coords = (FT_Fixed *) g_alloca (num_coords * sizeof (FT_Fixed));
for (unsigned int i = 0; i < num_coords; i++)
ft_coords[i] = coords[i] << 2;
FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords);
}
cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, FT_LOAD_NO_HINTING | FT_LOAD_COLOR);
if (face->embolden)
cairo_ft_font_face_set_synthesize (cairo_face, CAIRO_FT_SYNTHESIZE_BOLD);
cairo_font_face_set_user_data (cairo_face, &key,
ft_face, (cairo_destroy_func_t) FT_Done_Face);
cairo_font_face_set_user_data (cairo_face, &key2,
blob, (cairo_destroy_func_t) hb_blob_destroy);
return cairo_face;
}
#endif
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