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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_PRIVATE_HH
+#define HB_FONT_PRIVATE_HH
+
+#include "hb-private.hh"
+
+#include "hb-font.h"
+#include "hb-object-private.hh"
+#include "hb-face-private.hh"
+#include "hb-shaper-private.hh"
+
+
+
+/*
+ * 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) \
+ 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;
+ ASSERT_POD ();
+
+ hb_bool_t immutable;
+
+ /* Don't access these directly. Call hb_font_get_*() instead. */
+
+ struct {
+#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;
+
+ struct {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ } destroy;
+};
+
+
+
+/*
+ * hb_font_t
+ */
+
+struct hb_font_t {
+ hb_object_header_t header;
+ ASSERT_POD ();
+
+ hb_bool_t immutable;
+
+ hb_font_t *parent;
+ hb_face_t *face;
+
+ 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;
+
+ struct hb_shaper_data_t shaper_data;
+
+
+ /* 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);
+ }
+
+
+ /* Public getters */
+
+ inline hb_bool_t get_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
+ hb_codepoint_t *glyph)
+ {
+ *glyph = 0;
+ return klass->get.glyph (this, user_data,
+ unicode, variation_selector, glyph,
+ klass->user_data.glyph);
+ }
+
+ inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph)
+ {
+ return klass->get.glyph_h_advance (this, user_data,
+ glyph,
+ klass->user_data.glyph_h_advance);
+ }
+
+ inline hb_position_t get_glyph_v_advance (hb_codepoint_t glyph)
+ {
+ return klass->get.glyph_v_advance (this, user_data,
+ glyph,
+ klass->user_data.glyph_v_advance);
+ }
+
+ inline 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.glyph_h_origin (this, user_data,
+ glyph, x, y,
+ klass->user_data.glyph_h_origin);
+ }
+
+ inline 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.glyph_v_origin (this, user_data,
+ glyph, x, y,
+ klass->user_data.glyph_v_origin);
+ }
+
+ inline hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
+ {
+ return klass->get.glyph_h_kerning (this, user_data,
+ left_glyph, right_glyph,
+ klass->user_data.glyph_h_kerning);
+ }
+
+ inline hb_position_t get_glyph_v_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
+ {
+ return klass->get.glyph_v_kerning (this, user_data,
+ left_glyph, right_glyph,
+ klass->user_data.glyph_v_kerning);
+ }
+
+ inline hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
+ hb_glyph_extents_t *extents)
+ {
+ memset (extents, 0, sizeof (*extents));
+ return klass->get.glyph_extents (this, user_data,
+ glyph,
+ extents,
+ klass->user_data.glyph_extents);
+ }
+
+ inline 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.glyph_contour_point (this, user_data,
+ glyph, point_index,
+ x, y,
+ klass->user_data.glyph_contour_point);
+ }
+
+ inline hb_bool_t get_glyph_name (hb_codepoint_t glyph,
+ char *name, unsigned int size)
+ {
+ if (size) *name = '\0';
+ return klass->get.glyph_name (this, user_data,
+ glyph,
+ name, size,
+ klass->user_data.glyph_name);
+ }
+
+ inline 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.glyph_from_name (this, user_data,
+ name, len,
+ glyph,
+ klass->user_data.glyph_from_name);
+ }
+
+
+ /* A bit higher-level, and with fallback */
+
+ inline void get_glyph_advance_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))) {
+ *x = get_glyph_h_advance (glyph);
+ *y = 0;
+ } else {
+ *x = 0;
+ *y = get_glyph_v_advance (glyph);
+ }
+ }
+
+ /* Internal only */
+ inline 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 use font_metics.ascent */
+ *y = y_scale;
+ }
+
+ inline 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)))
+ {
+ 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;
+ }
+ }
+ else
+ {
+ 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;
+ }
+ }
+ }
+
+ inline 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;
+ }
+
+ inline 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;
+ }
+
+ inline 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))) {
+ *x = get_glyph_h_kerning (first_glyph, second_glyph);
+ *y = 0;
+ } else {
+ *x = 0;
+ *y = get_glyph_v_kerning (first_glyph, second_glyph);
+ }
+ }
+
+ inline 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;
+ }
+
+ inline 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. */
+ inline 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. */
+ inline 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_glyph (unichar, 0, glyph))
+ return true;
+ }
+
+ return false;
+ }
+
+ private:
+ inline hb_position_t em_scale (int16_t v, int scale)
+ {
+ unsigned int upem = face->get_upem ();
+ return (v * (int64_t) scale + upem / 2) / upem;
+ }
+};
+
+#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
+#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, font);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+#undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
+
+
+#endif /* HB_FONT_PRIVATE_HH */
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