340 lines
11 KiB
C++
340 lines
11 KiB
C++
/*
|
|
* Copyright © 2011,2014 Google, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* Google Author(s): Behdad Esfahbod, Roozbeh Pournader
|
|
*/
|
|
|
|
#include "hb.hh"
|
|
|
|
#ifndef HB_NO_OT_FONT
|
|
|
|
#include "hb-ot.h"
|
|
|
|
#include "hb-font.hh"
|
|
#include "hb-machinery.hh"
|
|
#include "hb-ot-face.hh"
|
|
|
|
#include "hb-ot-cmap-table.hh"
|
|
#include "hb-ot-glyf-table.hh"
|
|
#include "hb-ot-cff1-table.hh"
|
|
#include "hb-ot-cff2-table.hh"
|
|
#include "hb-ot-hmtx-table.hh"
|
|
#include "hb-ot-os2-table.hh"
|
|
#include "hb-ot-post-table.hh"
|
|
#include "hb-ot-stat-table.hh" // Just so we compile it; unused otherwise.
|
|
#include "hb-ot-vorg-table.hh"
|
|
#include "hb-ot-color-cbdt-table.hh"
|
|
#include "hb-ot-color-sbix-table.hh"
|
|
|
|
|
|
/**
|
|
* SECTION:hb-ot-font
|
|
* @title: hb-ot-font
|
|
* @short_description: OpenType font implementation
|
|
* @include: hb-ot.h
|
|
*
|
|
* Functions for using OpenType fonts with hb_shape(). Note that fonts returned
|
|
* by hb_font_create() default to using these functions, so most clients would
|
|
* never need to call these functions directly.
|
|
**/
|
|
|
|
|
|
static hb_bool_t
|
|
hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
|
|
void *font_data,
|
|
hb_codepoint_t unicode,
|
|
hb_codepoint_t *glyph,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
return ot_face->cmap->get_nominal_glyph (unicode, glyph);
|
|
}
|
|
|
|
static unsigned int
|
|
hb_ot_get_nominal_glyphs (hb_font_t *font HB_UNUSED,
|
|
void *font_data,
|
|
unsigned int count,
|
|
const hb_codepoint_t *first_unicode,
|
|
unsigned int unicode_stride,
|
|
hb_codepoint_t *first_glyph,
|
|
unsigned int glyph_stride,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
return ot_face->cmap->get_nominal_glyphs (count,
|
|
first_unicode, unicode_stride,
|
|
first_glyph, glyph_stride);
|
|
}
|
|
|
|
static hb_bool_t
|
|
hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
|
|
void *font_data,
|
|
hb_codepoint_t unicode,
|
|
hb_codepoint_t variation_selector,
|
|
hb_codepoint_t *glyph,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
return ot_face->cmap->get_variation_glyph (unicode, variation_selector, glyph);
|
|
}
|
|
|
|
static void
|
|
hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
|
|
unsigned count,
|
|
const hb_codepoint_t *first_glyph,
|
|
unsigned glyph_stride,
|
|
hb_position_t *first_advance,
|
|
unsigned advance_stride,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx;
|
|
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
*first_advance = font->em_scale_x (hmtx.get_advance (*first_glyph, font));
|
|
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
|
|
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
|
|
}
|
|
}
|
|
|
|
static void
|
|
hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
|
|
unsigned count,
|
|
const hb_codepoint_t *first_glyph,
|
|
unsigned glyph_stride,
|
|
hb_position_t *first_advance,
|
|
unsigned advance_stride,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
|
|
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
*first_advance = font->em_scale_y (-(int) vmtx.get_advance (*first_glyph, font));
|
|
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
|
|
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
|
|
}
|
|
}
|
|
|
|
static hb_bool_t
|
|
hb_ot_get_glyph_v_origin (hb_font_t *font,
|
|
void *font_data,
|
|
hb_codepoint_t glyph,
|
|
hb_position_t *x,
|
|
hb_position_t *y,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
|
|
*x = font->get_glyph_h_advance (glyph) / 2;
|
|
|
|
#ifndef HB_NO_OT_FONT_CFF
|
|
const OT::VORG &VORG = *ot_face->VORG;
|
|
if (VORG.has_data ())
|
|
{
|
|
*y = font->em_scale_y (VORG.get_y_origin (glyph));
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
hb_glyph_extents_t extents = {0};
|
|
if (ot_face->glyf->get_extents (font, glyph, &extents))
|
|
{
|
|
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
|
|
hb_position_t tsb = vmtx.get_side_bearing (font, glyph);
|
|
*y = extents.y_bearing + font->em_scale_y (tsb);
|
|
return true;
|
|
}
|
|
|
|
hb_font_extents_t font_extents;
|
|
font->get_h_extents_with_fallback (&font_extents);
|
|
*y = font_extents.ascender;
|
|
|
|
return true;
|
|
}
|
|
|
|
static hb_bool_t
|
|
hb_ot_get_glyph_extents (hb_font_t *font,
|
|
void *font_data,
|
|
hb_codepoint_t glyph,
|
|
hb_glyph_extents_t *extents,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
|
|
#if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR)
|
|
if (ot_face->sbix->get_extents (font, glyph, extents)) return true;
|
|
#endif
|
|
if (ot_face->glyf->get_extents (font, glyph, extents)) return true;
|
|
#ifndef HB_NO_OT_FONT_CFF
|
|
if (ot_face->cff1->get_extents (font, glyph, extents)) return true;
|
|
if (ot_face->cff2->get_extents (font, glyph, extents)) return true;
|
|
#endif
|
|
#if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR)
|
|
if (ot_face->CBDT->get_extents (font, glyph, extents)) return true;
|
|
#endif
|
|
|
|
// TODO Hook up side-bearings variations.
|
|
return false;
|
|
}
|
|
|
|
#ifndef HB_NO_OT_FONT_GLYPH_NAMES
|
|
static hb_bool_t
|
|
hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
|
|
void *font_data,
|
|
hb_codepoint_t glyph,
|
|
char *name, unsigned int size,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
if (ot_face->post->get_glyph_name (glyph, name, size)) return true;
|
|
#ifndef HB_NO_OT_FONT_CFF
|
|
if (ot_face->cff1->get_glyph_name (glyph, name, size)) return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
static hb_bool_t
|
|
hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
|
|
void *font_data,
|
|
const char *name, int len,
|
|
hb_codepoint_t *glyph,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data;
|
|
if (ot_face->post->get_glyph_from_name (name, len, glyph)) return true;
|
|
#ifndef HB_NO_OT_FONT_CFF
|
|
if (ot_face->cff1->get_glyph_from_name (name, len, glyph)) return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static hb_bool_t
|
|
hb_ot_get_font_h_extents (hb_font_t *font,
|
|
void *font_data HB_UNUSED,
|
|
hb_font_extents_t *metrics,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, &metrics->ascender) &&
|
|
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER, &metrics->descender) &&
|
|
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP, &metrics->line_gap);
|
|
}
|
|
|
|
static hb_bool_t
|
|
hb_ot_get_font_v_extents (hb_font_t *font,
|
|
void *font_data HB_UNUSED,
|
|
hb_font_extents_t *metrics,
|
|
void *user_data HB_UNUSED)
|
|
{
|
|
return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_ASCENDER, &metrics->ascender) &&
|
|
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_DESCENDER, &metrics->descender) &&
|
|
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_LINE_GAP, &metrics->line_gap);
|
|
}
|
|
|
|
#if HB_USE_ATEXIT
|
|
static void free_static_ot_funcs ();
|
|
#endif
|
|
|
|
static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot_font_funcs_lazy_loader_t>
|
|
{
|
|
static hb_font_funcs_t *create ()
|
|
{
|
|
hb_font_funcs_t *funcs = hb_font_funcs_create ();
|
|
|
|
hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
|
|
hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
|
|
hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
|
|
hb_font_funcs_set_nominal_glyphs_func (funcs, hb_ot_get_nominal_glyphs, nullptr, nullptr);
|
|
hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ot_get_glyph_h_advances, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_v_advances_func (funcs, hb_ot_get_glyph_v_advances, nullptr, nullptr);
|
|
//hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
|
|
//hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
|
|
#ifndef HB_NO_OT_FONT_GLYPH_NAMES
|
|
hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
|
|
#endif
|
|
|
|
hb_font_funcs_make_immutable (funcs);
|
|
|
|
#if HB_USE_ATEXIT
|
|
atexit (free_static_ot_funcs);
|
|
#endif
|
|
|
|
return funcs;
|
|
}
|
|
} static_ot_funcs;
|
|
|
|
#if HB_USE_ATEXIT
|
|
static
|
|
void free_static_ot_funcs ()
|
|
{
|
|
static_ot_funcs.free_instance ();
|
|
}
|
|
#endif
|
|
|
|
static hb_font_funcs_t *
|
|
_hb_ot_get_font_funcs ()
|
|
{
|
|
return static_ot_funcs.get_unconst ();
|
|
}
|
|
|
|
|
|
/**
|
|
* hb_ot_font_set_funcs:
|
|
* @font: #hb_font_t to work upon
|
|
*
|
|
* Sets the font functions to use when working with @font.
|
|
*
|
|
* Since: 0.9.28
|
|
**/
|
|
void
|
|
hb_ot_font_set_funcs (hb_font_t *font)
|
|
{
|
|
hb_font_set_funcs (font,
|
|
_hb_ot_get_font_funcs (),
|
|
&font->face->table,
|
|
nullptr);
|
|
}
|
|
|
|
#ifndef HB_NO_VAR
|
|
int
|
|
_glyf_get_side_bearing_var (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical)
|
|
{
|
|
return font->face->table.glyf->get_side_bearing_var (font, glyph, is_vertical);
|
|
}
|
|
|
|
unsigned
|
|
_glyf_get_advance_var (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical)
|
|
{
|
|
return font->face->table.glyf->get_advance_var (font, glyph, is_vertical);
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif
|