*/
#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
+ HB_FONT_FUNC_IMPLEMENT (font_h_extents) \
+ HB_FONT_FUNC_IMPLEMENT (font_v_extents) \
HB_FONT_FUNC_IMPLEMENT (glyph) \
HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
+ inline hb_bool_t get_font_h_extents (hb_font_extents_t *extents)
+ {
+ memset (extents, 0, sizeof (*extents));
+ return klass->get.f.font_h_extents (this, user_data,
+ extents,
+ klass->user_data.font_h_extents);
+ }
+ inline hb_bool_t get_font_v_extents (hb_font_extents_t *extents)
+ {
+ memset (extents, 0, sizeof (*extents));
+ return klass->get.f.font_v_extents (this, user_data,
+ extents,
+ klass->user_data.font_v_extents);
+ }
+
inline bool has_glyph (hb_codepoint_t unicode)
{
hb_codepoint_t glyph;
/* A bit higher-level, and with fallback */
+ inline void get_extents_for_direction (hb_direction_t direction,
+ hb_font_extents_t *extents)
+ {
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
+ if (!get_font_h_extents (extents))
+ {
+ extents->ascender = y_scale * .8;
+ extents->descender = y_scale - extents->ascender;
+ extents->line_gap = 0;
+ }
+ } else {
+ if (!get_font_v_extents (extents))
+ {
+ extents->ascender = x_scale / 2;
+ extents->descender = x_scale - extents->ascender;
+ extents->line_gap = 0;
+ }
+ }
+ }
+
inline void get_glyph_advance_for_direction (hb_codepoint_t glyph,
hb_direction_t direction,
hb_position_t *x, hb_position_t *y)
{
*x = get_glyph_h_advance (glyph) / 2;
- /* TODO use font_metrics.ascent */
+ /* TODO use font_extents.ascender */
*y = y_scale;
}
*/
static hb_bool_t
+hb_font_get_font_h_extents_nil (hb_font_t *font,
+ void *font_data HB_UNUSED,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
+{
+ memset (metrics, 0, sizeof (*metrics));
+ return false;
+}
+static hb_bool_t
+hb_font_get_font_h_extents_parent (hb_font_t *font,
+ void *font_data HB_UNUSED,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
+{
+ hb_bool_t ret = font->parent->get_font_h_extents (metrics);
+ if (ret) {
+ metrics->ascender = font->parent_scale_y_distance (metrics->ascender);
+ metrics->descender = font->parent_scale_y_distance (metrics->descender);
+ metrics->line_gap = font->parent_scale_y_distance (metrics->line_gap);
+ }
+ return ret;
+}
+
+static hb_bool_t
+hb_font_get_font_v_extents_nil (hb_font_t *font,
+ void *font_data HB_UNUSED,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
+{
+ memset (metrics, 0, sizeof (*metrics));
+ return false;
+}
+static hb_bool_t
+hb_font_get_font_v_extents_parent (hb_font_t *font,
+ void *font_data HB_UNUSED,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
+{
+ hb_bool_t ret = font->parent->get_font_v_extents (metrics);
+ if (ret) {
+ metrics->ascender = font->parent_scale_x_distance (metrics->ascender);
+ metrics->descender = font->parent_scale_x_distance (metrics->descender);
+ metrics->line_gap = font->parent_scale_x_distance (metrics->line_gap);
+ }
+ return ret;
+}
+
+static hb_bool_t
hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t unicode,
return font->parent->get_glyph_from_name (name, len, glyph);
}
-
static const hb_font_funcs_t _hb_font_funcs_nil = {
HB_OBJECT_HEADER_STATIC,
/* Public getters */
/**
+ * hb_font_get_h_extents:
+ * @font: a font.
+ * @extents: (out):
+ *
+ *
+ *
+ * Return value:
+ *
+ * Since: 1.1.2
+ **/
+hb_bool_t
+hb_font_get_h_extents (hb_font_t *font,
+ hb_font_extents_t *extents)
+{
+ return font->get_font_h_extents (extents);
+}
+
+/**
+ * hb_font_get_v_extents:
+ * @font: a font.
+ * @extents: (out):
+ *
+ *
+ *
+ * Return value:
+ *
+ * Since: 1.1.2
+ **/
+hb_bool_t
+hb_font_get_v_extents (hb_font_t *font,
+ hb_font_extents_t *extents)
+{
+ return font->get_font_v_extents (extents);
+}
+
+/**
* hb_font_get_glyph:
* @font: a font.
* @unicode:
/* A bit higher-level, and with fallback */
/**
+ * hb_font_get_extents_for_direction:
+ * @font: a font.
+ * @direction:
+ * @extents:
+ *
+ *
+ *
+ * Since: 1.1.2
+ **/
+void
+hb_font_get_extents_for_direction (hb_font_t *font,
+ hb_direction_t direction,
+ hb_font_extents_t *extents)
+{
+ return font->get_extents_for_direction (direction, extents);
+}
+/**
* hb_font_get_glyph_advance_for_direction:
* @font: a font.
* @glyph:
hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs);
-/* glyph extents */
+/* font and glyph extents */
+
+/* Note that typically ascender is positive and descender negative in coordinate systems that grow up. */
+typedef struct hb_font_extents_t
+{
+ hb_position_t ascender; /* typographic ascender. */
+ hb_position_t descender; /* typographic descender. */
+ hb_position_t line_gap; /* suggested line spacing gap. */
+} hb_font_extents_t;
/* Note that height is negative in coordinate systems that grow up. */
typedef struct hb_glyph_extents_t
hb_position_t height; /* distance from top to bottom side. */
} hb_glyph_extents_t;
-
/* func types */
+typedef hb_bool_t (*hb_font_get_font_extents_func_t) (hb_font_t *font, void *font_data,
+ hb_font_extents_t *metrics,
+ void *user_data);
+typedef hb_font_get_font_extents_func_t hb_font_get_font_h_extents_func_t;
+typedef hb_font_get_font_extents_func_t hb_font_get_font_v_extents_func_t;
+
+
typedef hb_bool_t (*hb_font_get_glyph_func_t) (hb_font_t *font, void *font_data,
hb_codepoint_t unicode, hb_codepoint_t variation_selector,
hb_codepoint_t *glyph,
/* func setters */
/**
+ * hb_font_funcs_set_font_h_extents_func:
+ * @ffuncs: font functions.
+ * @func: (closure user_data) (destroy destroy) (scope notified):
+ * @user_data:
+ * @destroy:
+ *
+ *
+ *
+ * Since: 1.1.2
+ **/
+HB_EXTERN void
+hb_font_funcs_set_font_h_extents_func (hb_font_funcs_t *ffuncs,
+ hb_font_get_font_h_extents_func_t func,
+ void *user_data, hb_destroy_func_t destroy);
+
+/**
+ * hb_font_funcs_set_font_v_extents_func:
+ * @ffuncs: font functions.
+ * @func: (closure user_data) (destroy destroy) (scope notified):
+ * @user_data:
+ * @destroy:
+ *
+ *
+ *
+ * Since: 1.1.2
+ **/
+HB_EXTERN void
+hb_font_funcs_set_font_v_extents_func (hb_font_funcs_t *ffuncs,
+ hb_font_get_font_v_extents_func_t func,
+ void *user_data, hb_destroy_func_t destroy);
+
+/**
* hb_font_funcs_set_glyph_func:
* @ffuncs: font functions.
* @func: (closure user_data) (destroy destroy) (scope notified):
hb_font_get_glyph_from_name_func_t func,
void *user_data, hb_destroy_func_t destroy);
-
/* func dispatch */
HB_EXTERN hb_bool_t
+hb_font_get_h_extents (hb_font_t *font,
+ hb_font_extents_t *extents);
+HB_EXTERN hb_bool_t
+hb_font_get_v_extents (hb_font_t *font,
+ hb_font_extents_t *extents);
+
+HB_EXTERN hb_bool_t
hb_font_get_glyph (hb_font_t *font,
hb_codepoint_t unicode, hb_codepoint_t variation_selector,
hb_codepoint_t *glyph);
/* high-level funcs, with fallback */
HB_EXTERN void
+hb_font_get_extents_for_direction (hb_font_t *font,
+ hb_direction_t direction,
+ hb_font_extents_t *extents);
+HB_EXTERN void
hb_font_get_glyph_advance_for_direction (hb_font_t *font,
hb_codepoint_t glyph,
hb_direction_t direction,
return *glyph != 0;
}
+static hb_bool_t
+hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
+{
+ const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+ FT_Face ft_face = ft_font->ft_face;
+ metrics->ascender = ft_face->ascender;
+ metrics->descender = ft_face->descender;
+ metrics->line_gap = ft_face->height - (ft_face->ascender - ft_face->descender);
+ if (font->y_scale < 0)
+ {
+ metrics->ascender = -metrics->ascender;
+ metrics->descender = -metrics->descender;
+ metrics->line_gap = -metrics->line_gap;
+ }
+ return true;
+}
static hb_font_funcs_t *static_ft_funcs = NULL;
{
funcs = hb_font_funcs_create ();
+ hb_font_funcs_set_font_h_extents_func (funcs, hb_ft_get_font_h_extents, NULL, NULL);
+ //hb_font_funcs_set_font_v_extents_func (funcs, hb_ft_get_font_v_extents, NULL, NULL);
hb_font_funcs_set_glyph_func (funcs, hb_ft_get_glyph, NULL, NULL);
hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ft_get_glyph_h_advance, NULL, NULL);
hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ft_get_glyph_v_advance, NULL, NULL);
#include "hb-ot-head-table.hh"
#include "hb-ot-hhea-table.hh"
#include "hb-ot-hmtx-table.hh"
+#include "hb-ot-os2-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)
+ hb_tag_t _hea_tag,
+ hb_tag_t _mtx_tag,
+ hb_tag_t os2_tag)
{
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);
+ this->ascender = os2->sTypoAscender;
+ this->descender = os2->sTypoDescender;
+ this->line_gap = os2->sTypoLineGap;
+ hb_blob_destroy (os2_blob);
+ got_font_extents = (this->ascender | this->descender) != 0;
+ }
+
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));
return NULL;
ot_font->cmap.init (face);
- ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx);
- ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx); /* 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;
return ret;
}
+static hb_bool_t
+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)
+{
+ 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_font_v_extents (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_font_extents_t *metrics,
+ void *user_data HB_UNUSED)
+{
+ 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_font_funcs_t *static_ot_funcs = NULL;
{
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_glyph_func (funcs, hb_ot_get_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);