diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-font.cc')
-rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-font.cc | 534 |
1 files changed, 534 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-font.cc b/thirdparty/harfbuzz/src/hb-ot-font.cc new file mode 100644 index 0000000000..c90a65665c --- /dev/null +++ b/thirdparty/harfbuzz/src/hb-ot-font.cc @@ -0,0 +1,534 @@ +/* + * 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. + **/ + +using hb_ot_font_advance_cache_t = hb_cache_t<24, 16, 8, true>; + +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_ot_font_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::HVAR &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_ot_font_advance_cache_t *cache = nullptr; + if (use_cache) + { + retry: + cache = ot_font->advance_cache.get_acquire (); + if (unlikely (!cache)) + { + cache = (hb_ot_font_advance_cache_t *) hb_malloc (sizeof (hb_ot_font_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_release (font->serial_coords); + } + } + out: + + if (!use_cache) + { + for (unsigned int i = 0; i < count; i++) + { + *first_advance = font->em_scale_x (hmtx.get_advance_with_var_unscaled (*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_acquire () != (int) font->serial_coords) + { + ot_font->advance_cache->init (); + ot_font->cached_coords_serial.set_release (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_with_var_unscaled (*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::VVAR &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_with_var_unscaled (*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 ()) + { + float delta = 0; + +#ifndef HB_NO_VAR + const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx; + const OT::VVAR &VVAR = *vmtx.var_table; + if (font->num_coords) + VVAR.get_vorg_delta_unscaled (glyph, + font->coords, font->num_coords, + &delta); +#endif + + *y = font->em_scalef_y (VORG.get_y_origin (glyph) + delta); + return true; + } + + hb_glyph_extents_t extents = {0}; + if (ot_face->glyf->get_extents (font, glyph, &extents)) + { + const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx; + int tsb = 0; + if (vmtx.get_leading_bearing_with_var_unscaled (font, glyph, &tsb)) + { + *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 +bool +_glyf_get_leading_bearing_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical, + int *lsb) +{ + return font->face->table.glyf->get_leading_bearing_with_var_unscaled (font, glyph, is_vertical, lsb); +} + +unsigned +_glyf_get_advance_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical) +{ + return font->face->table.glyf->get_advance_with_var_unscaled (font, glyph, is_vertical); +} +#endif + + +#endif |