521 lines
16 KiB
C++
521 lines
16 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-cache.hh"
|
|
#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.
|
|
**/
|
|
|
|
struct hb_ot_font_t
|
|
{
|
|
const hb_ot_face_t *ot_face;
|
|
|
|
/* h_advance caching */
|
|
mutable hb_atomic_int_t cached_coords_serial;
|
|
mutable hb_atomic_ptr_t<hb_advance_cache_t> advance_cache;
|
|
};
|
|
|
|
static hb_ot_font_t *
|
|
_hb_ot_font_create (hb_font_t *font)
|
|
{
|
|
hb_ot_font_t *ot_font = (hb_ot_font_t *) hb_calloc (1, sizeof (hb_ot_font_t));
|
|
if (unlikely (!ot_font))
|
|
return nullptr;
|
|
|
|
ot_font->ot_face = &font->face->table;
|
|
|
|
return ot_font;
|
|
}
|
|
|
|
static void
|
|
_hb_ot_font_destroy (void *font_data)
|
|
{
|
|
hb_ot_font_t *ot_font = (hb_ot_font_t *) font_data;
|
|
|
|
auto *cache = ot_font->advance_cache.get_relaxed ();
|
|
if (cache)
|
|
{
|
|
cache->fini ();
|
|
hb_free (cache);
|
|
}
|
|
|
|
hb_free (ot_font);
|
|
}
|
|
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx;
|
|
|
|
#ifndef HB_NO_VAR
|
|
const OT::HVARVVAR &HVAR = *hmtx.var_table;
|
|
const OT::VariationStore &varStore = &HVAR + HVAR.varStore;
|
|
OT::VariationStore::cache_t *varStore_cache = font->num_coords * count >= 128 ? varStore.create_cache () : nullptr;
|
|
|
|
bool use_cache = font->num_coords;
|
|
#else
|
|
OT::VariationStore::cache_t *varStore_cache = nullptr;
|
|
bool use_cache = false;
|
|
#endif
|
|
|
|
hb_advance_cache_t *cache = nullptr;
|
|
if (use_cache)
|
|
{
|
|
retry:
|
|
cache = ot_font->advance_cache.get ();
|
|
if (unlikely (!cache))
|
|
{
|
|
cache = (hb_advance_cache_t *) hb_malloc (sizeof (hb_advance_cache_t));
|
|
if (unlikely (!cache))
|
|
{
|
|
use_cache = false;
|
|
goto out;
|
|
}
|
|
|
|
cache->init ();
|
|
if (unlikely (!ot_font->advance_cache.cmpexch (nullptr, cache)))
|
|
{
|
|
hb_free (cache);
|
|
goto retry;
|
|
}
|
|
ot_font->cached_coords_serial.set (font->serial_coords);
|
|
}
|
|
}
|
|
out:
|
|
|
|
if (!use_cache)
|
|
{
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
*first_advance = font->em_scale_x (hmtx.get_advance (*first_glyph, font, varStore_cache));
|
|
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
|
|
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
|
|
}
|
|
}
|
|
else
|
|
{ /* Use cache. */
|
|
if (ot_font->cached_coords_serial.get () != (int) font->serial_coords)
|
|
{
|
|
ot_font->advance_cache->init ();
|
|
ot_font->cached_coords_serial.set (font->serial_coords);
|
|
}
|
|
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
hb_position_t v;
|
|
unsigned cv;
|
|
if (ot_font->advance_cache->get (*first_glyph, &cv))
|
|
v = cv;
|
|
else
|
|
{
|
|
v = hmtx.get_advance (*first_glyph, font, varStore_cache);
|
|
ot_font->advance_cache->set (*first_glyph, v);
|
|
}
|
|
*first_advance = font->em_scale_x (v);
|
|
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
|
|
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
|
|
}
|
|
}
|
|
|
|
#ifndef HB_NO_VAR
|
|
OT::VariationStore::destroy_cache (varStore_cache);
|
|
#endif
|
|
}
|
|
|
|
#ifndef HB_NO_VERTICAL
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
|
|
|
|
if (vmtx.has_data ())
|
|
{
|
|
#ifndef HB_NO_VAR
|
|
const OT::HVARVVAR &VVAR = *vmtx.var_table;
|
|
const OT::VariationStore &varStore = &VVAR + VVAR.varStore;
|
|
OT::VariationStore::cache_t *varStore_cache = font->num_coords ? varStore.create_cache () : nullptr;
|
|
#else
|
|
OT::VariationStore::cache_t *varStore_cache = nullptr;
|
|
#endif
|
|
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
*first_advance = font->em_scale_y (-(int) vmtx.get_advance (*first_glyph, font, varStore_cache));
|
|
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
|
|
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
|
|
}
|
|
|
|
#ifndef HB_NO_VAR
|
|
OT::VariationStore::destroy_cache (varStore_cache);
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
hb_font_extents_t font_extents;
|
|
font->get_h_extents_with_fallback (&font_extents);
|
|
hb_position_t advance = -(font_extents.ascender - font_extents.descender);
|
|
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
*first_advance = advance;
|
|
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
|
|
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifndef HB_NO_VERTICAL
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
|
|
*x = font->get_glyph_h_advance (glyph) / 2;
|
|
|
|
const OT::VORG &VORG = *ot_face->VORG;
|
|
if (VORG.has_data ())
|
|
{
|
|
*y = font->em_scale_y (VORG.get_y_origin (glyph));
|
|
return true;
|
|
}
|
|
|
|
hb_glyph_extents_t extents = {0};
|
|
if (ot_face->glyf->get_extents (font, glyph, &extents))
|
|
{
|
|
if (ot_face->vmtx->has_data ())
|
|
{
|
|
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);
|
|
hb_position_t advance = font_extents.ascender - font_extents.descender;
|
|
int diff = advance - -extents.height;
|
|
*y = extents.y_bearing + (diff >> 1);
|
|
return true;
|
|
}
|
|
|
|
hb_font_extents_t font_extents;
|
|
font->get_h_extents_with_fallback (&font_extents);
|
|
*y = font_extents.ascender;
|
|
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
|
|
#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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
|
|
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_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
|
const hb_ot_face_t *ot_face = ot_font->ot_face;
|
|
|
|
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);
|
|
}
|
|
|
|
#ifndef HB_NO_VERTICAL
|
|
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);
|
|
}
|
|
#endif
|
|
|
|
#ifndef HB_NO_DRAW
|
|
static void
|
|
hb_ot_get_glyph_shape (hb_font_t *font,
|
|
void *font_data HB_UNUSED,
|
|
hb_codepoint_t glyph,
|
|
hb_draw_funcs_t *draw_funcs, void *draw_data,
|
|
void *user_data)
|
|
{
|
|
hb_draw_session_t draw_session (draw_funcs, draw_data, font->slant_xy);
|
|
if (font->face->table.glyf->get_path (font, glyph, draw_session)) return;
|
|
#ifndef HB_NO_CFF
|
|
if (font->face->table.cff1->get_path (font, glyph, draw_session)) return;
|
|
if (font->face->table.cff2->get_path (font, glyph, draw_session)) return;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
static inline void free_static_ot_funcs ();
|
|
|
|
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_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_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ot_get_glyph_h_advances, nullptr, nullptr);
|
|
//hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
|
|
|
|
#ifndef HB_NO_VERTICAL
|
|
hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_v_advances_func (funcs, hb_ot_get_glyph_v_advances, nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
|
|
#endif
|
|
|
|
#ifndef HB_NO_DRAW
|
|
hb_font_funcs_set_glyph_shape_func (funcs, hb_ot_get_glyph_shape, nullptr, nullptr);
|
|
#endif
|
|
|
|
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);
|
|
|
|
hb_atexit (free_static_ot_funcs);
|
|
|
|
return funcs;
|
|
}
|
|
} static_ot_funcs;
|
|
|
|
static inline
|
|
void free_static_ot_funcs ()
|
|
{
|
|
static_ot_funcs.free_instance ();
|
|
}
|
|
|
|
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_ot_font_t *ot_font = _hb_ot_font_create (font);
|
|
if (unlikely (!ot_font))
|
|
return;
|
|
|
|
hb_font_set_funcs (font,
|
|
_hb_ot_get_font_funcs (),
|
|
ot_font,
|
|
_hb_ot_font_destroy);
|
|
}
|
|
|
|
#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
|