* hb_font_funcs_t
*/
+#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
+ HB_FONT_FUNC_IMPLEMENT (glyph) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_extents) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \
+ /* ^--- Add new callbacks here */
+
struct _hb_font_funcs_t {
hb_object_header_t header;
hb_bool_t immutable;
+ /* Don't access these directly. Call hb_font_get_*() instead. */
+
struct {
- hb_font_get_glyph_func_t get_glyph;
- hb_font_get_glyph_advance_func_t get_glyph_advance;
- hb_font_get_glyph_extents_func_t get_glyph_extents;
- hb_font_get_contour_point_func_t get_contour_point;
- hb_font_get_kerning_func_t get_kerning;
- } v;
-};
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ } get;
+
+ struct {
+#define HB_FONT_FUNC_IMPLEMENT(name) void *name;
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ } user_data;
-extern HB_INTERNAL hb_font_funcs_t _hb_font_funcs_nil;
+ struct {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ } destroy;
+};
/*
struct _hb_face_t {
hb_object_header_t header;
+ hb_bool_t immutable;
+
hb_get_table_func_t get_table;
void *user_data;
hb_destroy_func_t destroy;
- hb_blob_t *head_blob;
- const struct head *head_table;
-
struct hb_ot_layout_t *ot_layout;
+
+ unsigned int upem;
};
struct _hb_font_t {
hb_object_header_t header;
+ hb_bool_t immutable;
+
+ hb_font_t *parent;
hb_face_t *face;
- unsigned int x_scale;
- unsigned int y_scale;
+ int x_scale;
+ int y_scale;
unsigned int x_ppem;
unsigned int y_ppem;
hb_font_funcs_t *klass;
void *user_data;
hb_destroy_func_t destroy;
+
+
+ /* Convert from font-space to user-space */
+ inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); }
+ inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); }
+
+ /* Convert from parent-font user-space to our user-space */
+ inline hb_position_t parent_scale_x_distance (hb_position_t v) {
+ if (unlikely (parent && parent->x_scale != x_scale))
+ return v * (int64_t) this->x_scale / this->parent->x_scale;
+ return v;
+ }
+ inline hb_position_t parent_scale_y_distance (hb_position_t v) {
+ if (unlikely (parent && parent->y_scale != y_scale))
+ return v * (int64_t) this->y_scale / this->parent->y_scale;
+ return v;
+ }
+ inline hb_position_t parent_scale_x_position (hb_position_t v) {
+ return parent_scale_x_distance (v);
+ }
+ inline hb_position_t parent_scale_y_position (hb_position_t v) {
+ return parent_scale_y_distance (v);
+ }
+
+ inline void parent_scale_distance (hb_position_t *x, hb_position_t *y) {
+ *x = parent_scale_x_distance (*x);
+ *y = parent_scale_y_distance (*y);
+ }
+ inline void parent_scale_position (hb_position_t *x, hb_position_t *y) {
+ *x = parent_scale_x_position (*x);
+ *y = parent_scale_y_position (*y);
+ }
+
+
+ private:
+ inline hb_position_t em_scale (int16_t v, int scale) { return v * (int64_t) scale / this->face->upem; }
};