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/*
* Copyright (C) 2009 Red Hat, Inc.
* Copyright (C) 2009 Keith Stribley
*
* 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.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#include "hb-private.h"
#include "hb-ft.h"
#include "hb-font-private.h"
#include FT_TRUETYPE_TABLES_H
HB_BEGIN_DECLS
static hb_codepoint_t
hb_ft_get_glyph (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data,
hb_codepoint_t unicode,
hb_codepoint_t variation_selector)
{
FT_Face ft_face = (FT_Face) user_data;
#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX
if (unlikely (variation_selector)) {
hb_codepoint_t glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector);
if (glyph)
return glyph;
}
#endif
return FT_Get_Char_Index (ft_face, unicode);
}
static void
hb_ft_get_glyph_advance (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data,
hb_codepoint_t glyph,
hb_position_t *x_advance,
hb_position_t *y_advance)
{
FT_Face ft_face = (FT_Face) user_data;
int load_flags = FT_LOAD_DEFAULT;
/* TODO: load_flags, embolden, etc */
if (likely (!FT_Load_Glyph (ft_face, glyph, load_flags)))
{
*x_advance = ft_face->glyph->advance.x;
*y_advance = ft_face->glyph->advance.y;
}
}
static void
hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data,
hb_codepoint_t glyph,
hb_glyph_extents_t *extents)
{
FT_Face ft_face = (FT_Face) user_data;
int load_flags = FT_LOAD_DEFAULT;
/* TODO: load_flags, embolden, etc */
if (likely (!FT_Load_Glyph (ft_face, glyph, load_flags)))
{
/* XXX: A few negations should be in order here, not sure. */
extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
extents->width = ft_face->glyph->metrics.width;
extents->height = ft_face->glyph->metrics.height;
}
}
static hb_bool_t
hb_ft_get_contour_point (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data,
unsigned int point_index,
hb_codepoint_t glyph,
hb_position_t *x,
hb_position_t *y)
{
FT_Face ft_face = (FT_Face) user_data;
int load_flags = FT_LOAD_DEFAULT;
/* TODO: load_flags, embolden, etc */
if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
return FALSE;
if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
return FALSE;
if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
return FALSE;
*x = ft_face->glyph->outline.points[point_index].x;
*y = ft_face->glyph->outline.points[point_index].y;
return TRUE;
}
static hb_position_t
hb_ft_get_kerning (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data,
hb_codepoint_t first_glyph,
hb_codepoint_t second_glyph)
{
FT_Face ft_face = (FT_Face) user_data;
FT_Vector kerning;
/* TODO: Kern type? */
if (FT_Get_Kerning (ft_face, first_glyph, second_glyph, FT_KERNING_DEFAULT, &kerning))
return 0;
return kerning.x;
}
static hb_font_funcs_t ft_ffuncs = {
HB_REFERENCE_COUNT_INVALID, /* ref_count */
TRUE, /* immutable */
{
hb_ft_get_glyph,
hb_ft_get_glyph_advance,
hb_ft_get_glyph_extents,
hb_ft_get_contour_point,
hb_ft_get_kerning
}
};
hb_font_funcs_t *
hb_ft_get_font_funcs (void)
{
return &ft_ffuncs;
}
static hb_blob_t *
get_table (hb_tag_t tag, void *user_data)
{
FT_Face ft_face = (FT_Face) user_data;
FT_Byte *buffer;
FT_ULong length = 0;
FT_Error error;
if (unlikely (tag == HB_TAG_NONE))
return NULL;
error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
if (error)
return NULL;
/* TODO Use FT_Memory? */
buffer = (FT_Byte *) malloc (length);
if (buffer == NULL)
return NULL;
error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
if (error)
return NULL;
return hb_blob_create ((const char *) buffer, length,
HB_MEMORY_MODE_WRITABLE,
free, buffer);
}
hb_face_t *
hb_ft_face_create (FT_Face ft_face,
hb_destroy_func_t destroy)
{
hb_face_t *face;
if (ft_face->stream->read == NULL) {
hb_blob_t *blob;
blob = hb_blob_create ((const char *) ft_face->stream->base,
(unsigned int) ft_face->stream->size,
/* TODO: Check FT_FACE_FLAG_EXTERNAL_STREAM? */
HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
destroy, ft_face);
face = hb_face_create_for_data (blob, ft_face->face_index);
hb_blob_destroy (blob);
} else {
face = hb_face_create_for_tables (get_table, destroy, ft_face);
}
return face;
}
static void
hb_ft_face_finalize (FT_Face ft_face)
{
hb_face_destroy ((hb_face_t *) ft_face->generic.data);
}
hb_face_t *
hb_ft_face_create_cached (FT_Face ft_face)
{
if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize))
{
if (ft_face->generic.finalizer)
ft_face->generic.finalizer (ft_face);
ft_face->generic.data = hb_ft_face_create (ft_face, NULL);
ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize;
}
return hb_face_reference ((hb_face_t *) ft_face->generic.data);
}
hb_font_t *
hb_ft_font_create (FT_Face ft_face,
hb_destroy_func_t destroy)
{
hb_font_t *font;
font = hb_font_create ();
hb_font_set_funcs (font,
hb_ft_get_font_funcs (),
destroy, ft_face);
hb_font_set_scale (font,
((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16,
((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16);
hb_font_set_ppem (font,
ft_face->size->metrics.x_ppem,
ft_face->size->metrics.y_ppem);
return font;
}
HB_END_DECLS
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