#include "hb-font-private.hh"
#include "hb-ot-cmap-table.hh"
+#include "hb-ot-glyf-table.hh"
+#include "hb-ot-head-table.hh"
#include "hb-ot-hhea-table.hh"
#include "hb-ot-hmtx-table.hh"
+#include "hb-ot-os2-table.hh"
+//#include "hb-ot-post-table.hh"
struct hb_ot_face_metrics_accelerator_t
unsigned int num_metrics;
unsigned int num_advances;
unsigned int default_advance;
+ unsigned short ascender;
+ unsigned short descender;
+ unsigned short line_gap;
+
const OT::_mtx *table;
hb_blob_t *blob;
inline void init (hb_face_t *face,
- hb_tag_t _hea_tag, hb_tag_t _mtx_tag,
- unsigned int default_advance)
+ hb_tag_t _hea_tag,
+ hb_tag_t _mtx_tag,
+ hb_tag_t os2_tag)
{
- this->default_advance = default_advance;
- this->num_metrics = face->get_num_glyphs ();
+ this->default_advance = face->get_upem ();
+
+ bool got_font_extents = false;
+ if (os2_tag)
+ {
+ hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>::sanitize (face->reference_table (os2_tag));
+ const OT::os2 *os2 = OT::Sanitizer<OT::os2>::lock_instance (os2_blob);
+#define USE_TYPO_METRICS (1u<<7)
+ if (0 != (os2->fsSelection & USE_TYPO_METRICS))
+ {
+ this->ascender = os2->sTypoAscender;
+ this->descender = os2->sTypoDescender;
+ this->line_gap = os2->sTypoLineGap;
+ got_font_extents = (this->ascender | this->descender) != 0;
+ }
+ hb_blob_destroy (os2_blob);
+ }
hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (face->reference_table (_hea_tag));
const OT::_hea *_hea = OT::Sanitizer<OT::_hea>::lock_instance (_hea_blob);
this->num_advances = _hea->numberOfLongMetrics;
+ if (!got_font_extents)
+ {
+ this->ascender = _hea->ascender;
+ this->descender = _hea->descender;
+ this->line_gap = _hea->lineGap;
+ }
hb_blob_destroy (_hea_blob);
this->blob = OT::Sanitizer<OT::_mtx>::sanitize (face->reference_table (_mtx_tag));
- if (unlikely (!this->num_advances ||
- 2 * (this->num_advances + this->num_metrics) < hb_blob_get_length (this->blob)))
+
+ /* Cap num_metrics() and num_advances() based on table length. */
+ unsigned int len = hb_blob_get_length (this->blob);
+ if (unlikely (this->num_advances * 4 > len))
+ this->num_advances = len / 4;
+ this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2;
+
+ /* We MUST set num_metrics to zero if num_advances is zero.
+ * Our get_advance() depends on that. */
+ if (unlikely (!this->num_advances))
{
this->num_metrics = this->num_advances = 0;
hb_blob_destroy (this->blob);
if (unlikely (glyph >= this->num_metrics))
{
/* If this->num_metrics is zero, it means we don't have the metrics table
- * for this direction: return one EM. Otherwise, it means that the glyph
- * index is out of bound: return zero. */
+ * for this direction: return default advance. Otherwise, it means that the
+ * glyph index is out of bound: return zero. */
if (this->num_metrics)
return 0;
else
}
};
+struct hb_ot_face_glyf_accelerator_t
+{
+ bool short_offset;
+ unsigned int num_glyphs;
+ const OT::loca *loca;
+ const OT::glyf *glyf;
+ hb_blob_t *loca_blob;
+ hb_blob_t *glyf_blob;
+ unsigned int glyf_len;
+
+ inline void init (hb_face_t *face)
+ {
+ hb_blob_t *head_blob = OT::Sanitizer<OT::head>::sanitize (face->reference_table (HB_OT_TAG_head));
+ const OT::head *head = OT::Sanitizer<OT::head>::lock_instance (head_blob);
+ if ((unsigned int) head->indexToLocFormat > 1 || head->glyphDataFormat != 0)
+ {
+ /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */
+ hb_blob_destroy (head_blob);
+ return;
+ }
+ this->short_offset = 0 == head->indexToLocFormat;
+ hb_blob_destroy (head_blob);
+
+ this->loca_blob = OT::Sanitizer<OT::loca>::sanitize (face->reference_table (HB_OT_TAG_loca));
+ this->loca = OT::Sanitizer<OT::loca>::lock_instance (this->loca_blob);
+ this->glyf_blob = OT::Sanitizer<OT::glyf>::sanitize (face->reference_table (HB_OT_TAG_glyf));
+ this->glyf = OT::Sanitizer<OT::glyf>::lock_instance (this->glyf_blob);
+
+ this->num_glyphs = MAX (1u, hb_blob_get_length (this->loca_blob) / (this->short_offset ? 2 : 4)) - 1;
+ this->glyf_len = hb_blob_get_length (this->glyf_blob);
+ }
+
+ inline void fini (void)
+ {
+ hb_blob_destroy (this->loca_blob);
+ hb_blob_destroy (this->glyf_blob);
+ }
+
+ inline bool get_extents (hb_codepoint_t glyph,
+ hb_glyph_extents_t *extents) const
+ {
+ if (unlikely (glyph >= this->num_glyphs))
+ return false;
+
+ unsigned int start_offset, end_offset;
+ if (this->short_offset)
+ {
+ start_offset = 2 * this->loca->u.shortsZ[glyph];
+ end_offset = 2 * this->loca->u.shortsZ[glyph + 1];
+ }
+ else
+ {
+ start_offset = this->loca->u.longsZ[glyph];
+ end_offset = this->loca->u.longsZ[glyph + 1];
+ }
+
+ if (start_offset > end_offset || end_offset > this->glyf_len)
+ return false;
+
+ if (end_offset - start_offset < OT::glyfGlyphHeader::static_size)
+ return true; /* Empty glyph; zero extents. */
+
+ const OT::glyfGlyphHeader &glyph_header = OT::StructAtOffset<OT::glyfGlyphHeader> (this->glyf, start_offset);
+
+ extents->x_bearing = MIN (glyph_header.xMin, glyph_header.xMax);
+ extents->y_bearing = MAX (glyph_header.yMin, glyph_header.yMax);
+ extents->width = MAX (glyph_header.xMin, glyph_header.xMax) - extents->x_bearing;
+ extents->height = MIN (glyph_header.yMin, glyph_header.yMax) - extents->y_bearing;
+
+ return true;
+ }
+};
+
+typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj,
+ hb_codepoint_t codepoint,
+ hb_codepoint_t *glyph);
+
+template <typename Type>
+static inline bool get_glyph_from (const void *obj,
+ hb_codepoint_t codepoint,
+ hb_codepoint_t *glyph)
+{
+ const Type *typed_obj = (const Type *) obj;
+ return typed_obj->get_glyph (codepoint, glyph);
+}
+
struct hb_ot_face_cmap_accelerator_t
{
- const OT::CmapSubtable *table;
- const OT::CmapSubtable *uvs_table;
+ hb_cmap_get_glyph_func_t get_glyph_func;
+ const void *get_glyph_data;
+ OT::CmapSubtableFormat4::accelerator_t format4_accel;
+
+ const OT::CmapSubtableFormat14 *uvs_table;
hb_blob_t *blob;
inline void init (hb_face_t *face)
this->blob = OT::Sanitizer<OT::cmap>::sanitize (face->reference_table (HB_OT_TAG_cmap));
const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (this->blob);
const OT::CmapSubtable *subtable = NULL;
- const OT::CmapSubtable *subtable_uvs = NULL;
+ const OT::CmapSubtableFormat14 *subtable_uvs = NULL;
/* 32-bit subtables. */
if (!subtable) subtable = cmap->find_subtable (3, 10);
if (!subtable) subtable = cmap->find_subtable (0, 2);
if (!subtable) subtable = cmap->find_subtable (0, 1);
if (!subtable) subtable = cmap->find_subtable (0, 0);
+ if (!subtable) subtable = cmap->find_subtable (3, 0);
/* Meh. */
if (!subtable) subtable = &OT::Null(OT::CmapSubtable);
/* UVS subtable. */
- if (!subtable_uvs) subtable_uvs = cmap->find_subtable (0, 5);
+ if (!subtable_uvs)
+ {
+ const OT::CmapSubtable *st = cmap->find_subtable (0, 5);
+ if (st && st->u.format == 14)
+ subtable_uvs = &st->u.format14;
+ }
/* Meh. */
- if (!subtable_uvs) subtable_uvs = &OT::Null(OT::CmapSubtable);
+ if (!subtable_uvs) subtable_uvs = &OT::Null(OT::CmapSubtableFormat14);
- this->table = subtable;
this->uvs_table = subtable_uvs;
+
+ this->get_glyph_data = subtable;
+ switch (subtable->u.format) {
+ /* Accelerate format 4 and format 12. */
+ default: this->get_glyph_func = get_glyph_from<OT::CmapSubtable>; break;
+ case 12: this->get_glyph_func = get_glyph_from<OT::CmapSubtableFormat12>; break;
+ case 4:
+ {
+ this->format4_accel.init (&subtable->u.format4);
+ this->get_glyph_data = &this->format4_accel;
+ this->get_glyph_func = this->format4_accel.get_glyph_func;
+ }
+ break;
+ }
}
inline void fini (void)
hb_blob_destroy (this->blob);
}
- inline bool get_glyph (hb_codepoint_t unicode,
- hb_codepoint_t variation_selector,
- hb_codepoint_t *glyph) const
+ inline bool get_nominal_glyph (hb_codepoint_t unicode,
+ hb_codepoint_t *glyph) const
+ {
+ return this->get_glyph_func (this->get_glyph_data, unicode, glyph);
+ }
+
+ inline bool get_variation_glyph (hb_codepoint_t unicode,
+ hb_codepoint_t variation_selector,
+ hb_codepoint_t *glyph) const
{
- if (unlikely (variation_selector))
+ switch (this->uvs_table->get_glyph_variant (unicode,
+ variation_selector,
+ glyph))
{
- switch (this->uvs_table->get_glyph_variant (unicode,
- variation_selector,
- glyph))
- {
- case OT::GLYPH_VARIANT_NOT_FOUND: return false;
- case OT::GLYPH_VARIANT_FOUND: return true;
- case OT::GLYPH_VARIANT_USE_DEFAULT: break;
- }
+ case OT::GLYPH_VARIANT_NOT_FOUND: return false;
+ case OT::GLYPH_VARIANT_FOUND: return true;
+ case OT::GLYPH_VARIANT_USE_DEFAULT: break;
}
- return this->table->get_glyph (unicode, glyph);
+ return get_nominal_glyph (unicode, glyph);
}
};
+template <typename T>
+struct hb_lazy_loader_t
+{
+ inline void init (hb_face_t *face_)
+ {
+ face = face_;
+ instance = NULL;
+ }
+
+ inline void fini (void)
+ {
+ if (instance && instance != &OT::Null(T))
+ {
+ instance->fini();
+ free (instance);
+ }
+ }
+
+ inline const T* operator-> (void) const
+ {
+ retry:
+ T *p = (T *) hb_atomic_ptr_get (&instance);
+ if (unlikely (!p))
+ {
+ p = (T *) calloc (1, sizeof (T));
+ if (unlikely (!p))
+ return &OT::Null(T);
+ p->init (face);
+ if (unlikely (!hb_atomic_ptr_cmpexch (const_cast<T **>(&instance), NULL, p)))
+ {
+ p->fini ();
+ goto retry;
+ }
+ }
+ return p;
+ }
+
+ private:
+ hb_face_t *face;
+ T *instance;
+};
struct hb_ot_font_t
{
hb_ot_face_cmap_accelerator_t cmap;
hb_ot_face_metrics_accelerator_t h_metrics;
hb_ot_face_metrics_accelerator_t v_metrics;
+ hb_lazy_loader_t<hb_ot_face_glyf_accelerator_t> glyf;
};
static hb_ot_font_t *
-_hb_ot_font_create (hb_font_t *font)
+_hb_ot_font_create (hb_face_t *face)
{
hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t));
- hb_face_t *face = font->face;
if (unlikely (!ot_font))
return NULL;
- unsigned int upem = face->get_upem ();
-
ot_font->cmap.init (face);
- ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, upem>>1);
- ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, upem); /* TODO Can we do this lazily? */
+ ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, HB_OT_TAG_os2);
+ ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, HB_TAG_NONE); /* TODO Can we do this lazily? */
+ ot_font->glyf.init (face);
return ot_font;
}
ot_font->cmap.fini ();
ot_font->h_metrics.fini ();
ot_font->v_metrics.fini ();
+ ot_font->glyf.fini ();
free (ot_font);
}
static hb_bool_t
-hb_ot_get_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)
+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;
- return ot_font->cmap.get_glyph (unicode, variation_selector, glyph);
+ return ot_font->cmap.get_nominal_glyph (unicode, glyph);
}
-static hb_position_t
-hb_ot_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
+static hb_bool_t
+hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
void *font_data,
- hb_codepoint_t glyph,
+ 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;
- return font->em_scale_x (ot_font->h_metrics.get_advance (glyph));
+ return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph);
}
static hb_position_t
-hb_ot_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
+hb_ot_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
void *font_data,
hb_codepoint_t glyph,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
- return font->em_scale_y (-ot_font->v_metrics.get_advance (glyph));
-}
-
-static hb_bool_t
-hb_ot_get_glyph_h_origin (hb_font_t *font HB_UNUSED,
- void *font_data HB_UNUSED,
- hb_codepoint_t glyph HB_UNUSED,
- hb_position_t *x HB_UNUSED,
- hb_position_t *y HB_UNUSED,
- void *user_data HB_UNUSED)
-{
- /* We always work in the horizontal coordinates. */
- return true;
-}
-
-static hb_bool_t
-hb_ot_get_glyph_v_origin (hb_font_t *font HB_UNUSED,
- void *font_data,
- hb_codepoint_t glyph,
- hb_position_t *x,
- hb_position_t *y,
- void *user_data HB_UNUSED)
-{
- /* TODO */
- return false;
+ return font->em_scale_x (ot_font->h_metrics.get_advance (glyph));
}
static hb_position_t
-hb_ot_get_glyph_h_kerning (hb_font_t *font,
+hb_ot_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
void *font_data,
- hb_codepoint_t left_glyph,
- hb_codepoint_t right_glyph,
- void *user_data HB_UNUSED)
-{
- /* TODO */
- return 0;
-}
-
-static hb_position_t
-hb_ot_get_glyph_v_kerning (hb_font_t *font HB_UNUSED,
- void *font_data HB_UNUSED,
- hb_codepoint_t top_glyph HB_UNUSED,
- hb_codepoint_t bottom_glyph HB_UNUSED,
+ hb_codepoint_t glyph,
void *user_data HB_UNUSED)
{
- /* OpenType doesn't have vertical-kerning other than GPOS. */
- return 0;
+ const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
+ return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph));
}
static hb_bool_t
hb_glyph_extents_t *extents,
void *user_data HB_UNUSED)
{
- /* TODO */
- return false;
+ const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
+ bool ret = ot_font->glyf->get_extents (glyph, extents);
+ extents->x_bearing = font->em_scale_x (extents->x_bearing);
+ extents->y_bearing = font->em_scale_y (extents->y_bearing);
+ extents->width = font->em_scale_x (extents->width);
+ extents->height = font->em_scale_y (extents->height);
+ return ret;
}
static hb_bool_t
-hb_ot_get_glyph_contour_point (hb_font_t *font HB_UNUSED,
- void *font_data,
- hb_codepoint_t glyph,
- unsigned int point_index,
- hb_position_t *x,
- hb_position_t *y,
- void *user_data HB_UNUSED)
+hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
{
- /* TODO */
- return false;
+ const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
+ metrics->ascender = font->em_scale_y (ot_font->h_metrics.ascender);
+ metrics->descender = font->em_scale_y (ot_font->h_metrics.descender);
+ metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap);
+ return true;
}
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)
+hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
{
- /* TODO */
- return false;
+ const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
+ metrics->ascender = font->em_scale_x (ot_font->v_metrics.ascender);
+ metrics->descender = font->em_scale_x (ot_font->v_metrics.descender);
+ metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap);
+ return true;
}
-static hb_bool_t
-hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
- void *font_data,
- const char *name, int len, /* -1 means nul-terminated */
- hb_codepoint_t *glyph,
- void *user_data HB_UNUSED)
+static hb_font_funcs_t *static_ot_funcs = NULL;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_static_ot_funcs (void)
{
- /* TODO */
- return false;
+ hb_font_funcs_destroy (static_ot_funcs);
}
-
+#endif
static hb_font_funcs_t *
_hb_ot_get_font_funcs (void)
{
- static const hb_font_funcs_t ot_ffuncs = {
- HB_OBJECT_HEADER_STATIC,
+retry:
+ hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs);
- true, /* immutable */
-
- {
-#define HB_FONT_FUNC_IMPLEMENT(name) hb_ot_get_##name,
- HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
-#undef HB_FONT_FUNC_IMPLEMENT
+ if (unlikely (!funcs))
+ {
+ funcs = hb_font_funcs_create ();
+
+ hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, NULL, NULL);
+ hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, NULL, NULL);
+ hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, NULL, NULL);
+ hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, NULL, NULL);
+ hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, NULL, NULL);
+ hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, NULL, NULL);
+ //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, NULL, NULL);
+ //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, NULL, NULL);
+ //hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, NULL, NULL); TODO
+ //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, NULL, NULL);
+ hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, NULL, NULL);
+ //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, NULL, NULL); TODO
+ //hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, NULL, NULL); TODO
+ //hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, NULL, NULL); TODO
+
+ hb_font_funcs_make_immutable (funcs);
+
+ if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, NULL, funcs)) {
+ hb_font_funcs_destroy (funcs);
+ goto retry;
}
+
+#ifdef HB_USE_ATEXIT
+ atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
+#endif
};
- return const_cast<hb_font_funcs_t *> (&ot_ffuncs);
+ return funcs;
}
+/**
+ * hb_ot_font_set_funcs:
+ *
+ * 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);
+ hb_ot_font_t *ot_font = _hb_ot_font_create (font->face);
if (unlikely (!ot_font))
return;
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