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+/*
+ * Copyright © 2009 Red Hat, Inc.
+ * Copyright © 2011 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.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_FONT_HH
+#define HB_FONT_HH
+
+#include "hb.hh"
+
+#include "hb-face.hh"
+#include "hb-shaper.hh"
+
+
+/*
+ * hb_font_funcs_t
+ */
+
+#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
+ HB_FONT_FUNC_IMPLEMENT (font_h_extents) \
+ HB_FONT_FUNC_IMPLEMENT (font_v_extents) \
+ HB_FONT_FUNC_IMPLEMENT (nominal_glyph) \
+ HB_FONT_FUNC_IMPLEMENT (nominal_glyphs) \
+ HB_FONT_FUNC_IMPLEMENT (variation_glyph) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_h_advances) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_v_advances) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \
+ HB_IF_NOT_DEPRECATED (HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning)) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_extents) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_name) \
+ HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \
+ /* ^--- Add new callbacks here */
+
+struct hb_font_funcs_t
+{
+ hb_object_header_t header;
+
+ struct {
+#define HB_FONT_FUNC_IMPLEMENT(name) void *name;
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ } user_data;
+
+ struct {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ } destroy;
+
+ /* Don't access these directly. Call font->get_*() instead. */
+ union get_t {
+ struct get_funcs_t {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ } f;
+ void (*array[0
+#define HB_FONT_FUNC_IMPLEMENT(name) +1
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ ]) ();
+ } get;
+};
+DECLARE_NULL_INSTANCE (hb_font_funcs_t);
+
+
+/*
+ * hb_font_t
+ */
+
+#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, font);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+
+struct hb_font_t
+{
+ hb_object_header_t header;
+
+ hb_font_t *parent;
+ hb_face_t *face;
+
+ int32_t x_scale;
+ int32_t y_scale;
+ int64_t x_mult;
+ int64_t y_mult;
+
+ unsigned int x_ppem;
+ unsigned int y_ppem;
+
+ float ptem;
+
+ /* Font variation coordinates. */
+ unsigned int num_coords;
+ int *coords;
+ float *design_coords;
+
+ hb_font_funcs_t *klass;
+ void *user_data;
+ hb_destroy_func_t destroy;
+
+ hb_shaper_object_dataset_t<hb_font_t> data; /* Various shaper data. */
+
+
+ /* Convert from font-space to user-space */
+ int64_t dir_mult (hb_direction_t direction)
+ { return HB_DIRECTION_IS_VERTICAL(direction) ? y_mult : x_mult; }
+ hb_position_t em_scale_x (int16_t v) { return em_mult (v, x_mult); }
+ hb_position_t em_scale_y (int16_t v) { return em_mult (v, y_mult); }
+ hb_position_t em_scalef_x (float v) { return em_scalef (v, x_scale); }
+ hb_position_t em_scalef_y (float v) { return em_scalef (v, y_scale); }
+ float em_fscale_x (int16_t v) { return em_fscale (v, x_scale); }
+ float em_fscale_y (int16_t v) { return em_fscale (v, y_scale); }
+ hb_position_t em_scale_dir (int16_t v, hb_direction_t direction)
+ { return em_mult (v, dir_mult (direction)); }
+
+ /* Convert from parent-font user-space to our user-space */
+ hb_position_t parent_scale_x_distance (hb_position_t v)
+ {
+ if (unlikely (parent && parent->x_scale != x_scale))
+ return (hb_position_t) (v * (int64_t) this->x_scale / this->parent->x_scale);
+ return v;
+ }
+ hb_position_t parent_scale_y_distance (hb_position_t v)
+ {
+ if (unlikely (parent && parent->y_scale != y_scale))
+ return (hb_position_t) (v * (int64_t) this->y_scale / this->parent->y_scale);
+ return v;
+ }
+ hb_position_t parent_scale_x_position (hb_position_t v)
+ { return parent_scale_x_distance (v); }
+ hb_position_t parent_scale_y_position (hb_position_t v)
+ { return parent_scale_y_distance (v); }
+
+ void parent_scale_distance (hb_position_t *x, hb_position_t *y)
+ {
+ *x = parent_scale_x_distance (*x);
+ *y = parent_scale_y_distance (*y);
+ }
+ void parent_scale_position (hb_position_t *x, hb_position_t *y)
+ {
+ *x = parent_scale_x_position (*x);
+ *y = parent_scale_y_position (*y);
+ }
+
+
+ /* Public getters */
+
+ HB_INTERNAL bool has_func (unsigned int i);
+ HB_INTERNAL bool has_func_set (unsigned int i);
+
+ /* has_* ... */
+#define HB_FONT_FUNC_IMPLEMENT(name) \
+ bool \
+ has_##name##_func () \
+ { \
+ hb_font_funcs_t *funcs = this->klass; \
+ unsigned int i = offsetof (hb_font_funcs_t::get_t::get_funcs_t, name) / sizeof (funcs->get.array[0]); \
+ return has_func (i); \
+ } \
+ bool \
+ has_##name##_func_set () \
+ { \
+ hb_font_funcs_t *funcs = this->klass; \
+ unsigned int i = offsetof (hb_font_funcs_t::get_t::get_funcs_t, name) / sizeof (funcs->get.array[0]); \
+ return has_func_set (i); \
+ }
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+
+ 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);
+ }
+ 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);
+ }
+
+ bool has_glyph (hb_codepoint_t unicode)
+ {
+ hb_codepoint_t glyph;
+ return get_nominal_glyph (unicode, &glyph);
+ }
+
+ hb_bool_t get_nominal_glyph (hb_codepoint_t unicode,
+ hb_codepoint_t *glyph)
+ {
+ *glyph = 0;
+ return klass->get.f.nominal_glyph (this, user_data,
+ unicode, glyph,
+ klass->user_data.nominal_glyph);
+ }
+ unsigned int get_nominal_glyphs (unsigned int count,
+ const hb_codepoint_t *first_unicode,
+ unsigned int unicode_stride,
+ hb_codepoint_t *first_glyph,
+ unsigned int glyph_stride)
+ {
+ return klass->get.f.nominal_glyphs (this, user_data,
+ count,
+ first_unicode, unicode_stride,
+ first_glyph, glyph_stride,
+ klass->user_data.nominal_glyphs);
+ }
+
+ hb_bool_t get_variation_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
+ hb_codepoint_t *glyph)
+ {
+ *glyph = 0;
+ return klass->get.f.variation_glyph (this, user_data,
+ unicode, variation_selector, glyph,
+ klass->user_data.variation_glyph);
+ }
+
+ hb_position_t get_glyph_h_advance (hb_codepoint_t glyph)
+ {
+ return klass->get.f.glyph_h_advance (this, user_data,
+ glyph,
+ klass->user_data.glyph_h_advance);
+ }
+
+ hb_position_t get_glyph_v_advance (hb_codepoint_t glyph)
+ {
+ return klass->get.f.glyph_v_advance (this, user_data,
+ glyph,
+ klass->user_data.glyph_v_advance);
+ }
+
+ void get_glyph_h_advances (unsigned int count,
+ const hb_codepoint_t *first_glyph,
+ unsigned int glyph_stride,
+ hb_position_t *first_advance,
+ unsigned int advance_stride)
+ {
+ return klass->get.f.glyph_h_advances (this, user_data,
+ count,
+ first_glyph, glyph_stride,
+ first_advance, advance_stride,
+ klass->user_data.glyph_h_advances);
+ }
+
+ void get_glyph_v_advances (unsigned int count,
+ const hb_codepoint_t *first_glyph,
+ unsigned int glyph_stride,
+ hb_position_t *first_advance,
+ unsigned int advance_stride)
+ {
+ return klass->get.f.glyph_v_advances (this, user_data,
+ count,
+ first_glyph, glyph_stride,
+ first_advance, advance_stride,
+ klass->user_data.glyph_v_advances);
+ }
+
+ hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ *x = *y = 0;
+ return klass->get.f.glyph_h_origin (this, user_data,
+ glyph, x, y,
+ klass->user_data.glyph_h_origin);
+ }
+
+ hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ *x = *y = 0;
+ return klass->get.f.glyph_v_origin (this, user_data,
+ glyph, x, y,
+ klass->user_data.glyph_v_origin);
+ }
+
+ hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph,
+ hb_codepoint_t right_glyph)
+ {
+#ifdef HB_DISABLE_DEPRECATED
+ return 0;
+#else
+ return klass->get.f.glyph_h_kerning (this, user_data,
+ left_glyph, right_glyph,
+ klass->user_data.glyph_h_kerning);
+#endif
+ }
+
+ hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph,
+ hb_codepoint_t bottom_glyph)
+ {
+#ifdef HB_DISABLE_DEPRECATED
+ return 0;
+#else
+ return klass->get.f.glyph_v_kerning (this, user_data,
+ top_glyph, bottom_glyph,
+ klass->user_data.glyph_v_kerning);
+#endif
+ }
+
+ hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
+ hb_glyph_extents_t *extents)
+ {
+ memset (extents, 0, sizeof (*extents));
+ return klass->get.f.glyph_extents (this, user_data,
+ glyph,
+ extents,
+ klass->user_data.glyph_extents);
+ }
+
+ hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index,
+ hb_position_t *x, hb_position_t *y)
+ {
+ *x = *y = 0;
+ return klass->get.f.glyph_contour_point (this, user_data,
+ glyph, point_index,
+ x, y,
+ klass->user_data.glyph_contour_point);
+ }
+
+ hb_bool_t get_glyph_name (hb_codepoint_t glyph,
+ char *name, unsigned int size)
+ {
+ if (size) *name = '\0';
+ return klass->get.f.glyph_name (this, user_data,
+ glyph,
+ name, size,
+ klass->user_data.glyph_name);
+ }
+
+ hb_bool_t get_glyph_from_name (const char *name, int len, /* -1 means nul-terminated */
+ hb_codepoint_t *glyph)
+ {
+ *glyph = 0;
+ if (len == -1) len = strlen (name);
+ return klass->get.f.glyph_from_name (this, user_data,
+ name, len,
+ glyph,
+ klass->user_data.glyph_from_name);
+ }
+
+
+ /* A bit higher-level, and with fallback */
+
+ void get_h_extents_with_fallback (hb_font_extents_t *extents)
+ {
+ if (!get_font_h_extents (extents))
+ {
+ extents->ascender = y_scale * .8;
+ extents->descender = extents->ascender - y_scale;
+ extents->line_gap = 0;
+ }
+ }
+ void get_v_extents_with_fallback (hb_font_extents_t *extents)
+ {
+ if (!get_font_v_extents (extents))
+ {
+ extents->ascender = x_scale / 2;
+ extents->descender = extents->ascender - x_scale;
+ extents->line_gap = 0;
+ }
+ }
+
+ void get_extents_for_direction (hb_direction_t direction,
+ hb_font_extents_t *extents)
+ {
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
+ get_h_extents_with_fallback (extents);
+ else
+ get_v_extents_with_fallback (extents);
+ }
+
+ void get_glyph_advance_for_direction (hb_codepoint_t glyph,
+ hb_direction_t direction,
+ hb_position_t *x, hb_position_t *y)
+ {
+ *x = *y = 0;
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
+ *x = get_glyph_h_advance (glyph);
+ else
+ *y = get_glyph_v_advance (glyph);
+ }
+ void get_glyph_advances_for_direction (hb_direction_t direction,
+ unsigned int count,
+ const hb_codepoint_t *first_glyph,
+ unsigned glyph_stride,
+ hb_position_t *first_advance,
+ unsigned advance_stride)
+ {
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
+ get_glyph_h_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
+ else
+ get_glyph_v_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
+ }
+
+ void guess_v_origin_minus_h_origin (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ *x = get_glyph_h_advance (glyph) / 2;
+
+ /* TODO cache this somehow?! */
+ hb_font_extents_t extents;
+ get_h_extents_with_fallback (&extents);
+ *y = extents.ascender;
+ }
+
+ void get_glyph_h_origin_with_fallback (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ if (!get_glyph_h_origin (glyph, x, y) &&
+ get_glyph_v_origin (glyph, x, y))
+ {
+ hb_position_t dx, dy;
+ guess_v_origin_minus_h_origin (glyph, &dx, &dy);
+ *x -= dx; *y -= dy;
+ }
+ }
+ void get_glyph_v_origin_with_fallback (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ if (!get_glyph_v_origin (glyph, x, y) &&
+ get_glyph_h_origin (glyph, x, y))
+ {
+ hb_position_t dx, dy;
+ guess_v_origin_minus_h_origin (glyph, &dx, &dy);
+ *x += dx; *y += dy;
+ }
+ }
+
+ void get_glyph_origin_for_direction (hb_codepoint_t glyph,
+ hb_direction_t direction,
+ hb_position_t *x, hb_position_t *y)
+ {
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
+ get_glyph_h_origin_with_fallback (glyph, x, y);
+ else
+ get_glyph_v_origin_with_fallback (glyph, x, y);
+ }
+
+ void add_glyph_h_origin (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ hb_position_t origin_x, origin_y;
+
+ get_glyph_h_origin_with_fallback (glyph, &origin_x, &origin_y);
+
+ *x += origin_x;
+ *y += origin_y;
+ }
+ void add_glyph_v_origin (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ hb_position_t origin_x, origin_y;
+
+ get_glyph_v_origin_with_fallback (glyph, &origin_x, &origin_y);
+
+ *x += origin_x;
+ *y += origin_y;
+ }
+ void add_glyph_origin_for_direction (hb_codepoint_t glyph,
+ hb_direction_t direction,
+ hb_position_t *x, hb_position_t *y)
+ {
+ hb_position_t origin_x, origin_y;
+
+ get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);
+
+ *x += origin_x;
+ *y += origin_y;
+ }
+
+ void subtract_glyph_h_origin (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ hb_position_t origin_x, origin_y;
+
+ get_glyph_h_origin_with_fallback (glyph, &origin_x, &origin_y);
+
+ *x -= origin_x;
+ *y -= origin_y;
+ }
+ void subtract_glyph_v_origin (hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y)
+ {
+ hb_position_t origin_x, origin_y;
+
+ get_glyph_v_origin_with_fallback (glyph, &origin_x, &origin_y);
+
+ *x -= origin_x;
+ *y -= origin_y;
+ }
+ void subtract_glyph_origin_for_direction (hb_codepoint_t glyph,
+ hb_direction_t direction,
+ hb_position_t *x, hb_position_t *y)
+ {
+ hb_position_t origin_x, origin_y;
+
+ get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);
+
+ *x -= origin_x;
+ *y -= origin_y;
+ }
+
+ void get_glyph_kerning_for_direction (hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
+ hb_direction_t direction,
+ hb_position_t *x, hb_position_t *y)
+ {
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
+ *y = 0;
+ *x = get_glyph_h_kerning (first_glyph, second_glyph);
+ } else {
+ *x = 0;
+ *y = get_glyph_v_kerning (first_glyph, second_glyph);
+ }
+ }
+
+ hb_bool_t get_glyph_extents_for_origin (hb_codepoint_t glyph,
+ hb_direction_t direction,
+ hb_glyph_extents_t *extents)
+ {
+ hb_bool_t ret = get_glyph_extents (glyph, extents);
+
+ if (ret)
+ subtract_glyph_origin_for_direction (glyph, direction, &extents->x_bearing, &extents->y_bearing);
+
+ return ret;
+ }
+
+ hb_bool_t get_glyph_contour_point_for_origin (hb_codepoint_t glyph, unsigned int point_index,
+ hb_direction_t direction,
+ hb_position_t *x, hb_position_t *y)
+ {
+ hb_bool_t ret = get_glyph_contour_point (glyph, point_index, x, y);
+
+ if (ret)
+ subtract_glyph_origin_for_direction (glyph, direction, x, y);
+
+ return ret;
+ }
+
+ /* Generates gidDDD if glyph has no name. */
+ void
+ glyph_to_string (hb_codepoint_t glyph,
+ char *s, unsigned int size)
+ {
+ if (get_glyph_name (glyph, s, size)) return;
+
+ if (size && snprintf (s, size, "gid%u", glyph) < 0)
+ *s = '\0';
+ }
+
+ /* Parses gidDDD and uniUUUU strings automatically. */
+ hb_bool_t
+ glyph_from_string (const char *s, int len, /* -1 means nul-terminated */
+ hb_codepoint_t *glyph)
+ {
+ if (get_glyph_from_name (s, len, glyph)) return true;
+
+ if (len == -1) len = strlen (s);
+
+ /* Straight glyph index. */
+ if (hb_codepoint_parse (s, len, 10, glyph))
+ return true;
+
+ if (len > 3)
+ {
+ /* gidDDD syntax for glyph indices. */
+ if (0 == strncmp (s, "gid", 3) &&
+ hb_codepoint_parse (s + 3, len - 3, 10, glyph))
+ return true;
+
+ /* uniUUUU and other Unicode character indices. */
+ hb_codepoint_t unichar;
+ if (0 == strncmp (s, "uni", 3) &&
+ hb_codepoint_parse (s + 3, len - 3, 16, &unichar) &&
+ get_nominal_glyph (unichar, glyph))
+ return true;
+ }
+
+ return false;
+ }
+
+ void mults_changed ()
+ {
+ signed upem = face->get_upem ();
+ x_mult = ((int64_t) x_scale << 16) / upem;
+ y_mult = ((int64_t) y_scale << 16) / upem;
+ }
+
+ hb_position_t em_mult (int16_t v, int64_t mult)
+ {
+ return (hb_position_t) ((v * mult) >> 16);
+ }
+ hb_position_t em_scalef (float v, int scale)
+ { return (hb_position_t) roundf (v * scale / face->get_upem ()); }
+ float em_fscale (int16_t v, int scale)
+ { return (float) v * scale / face->get_upem (); }
+};
+DECLARE_NULL_INSTANCE (hb_font_t);
+
+
+#endif /* HB_FONT_HH */
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