Roll HarfBuzz to 1.4.1

third_party/harfbuzz-ng/src/hb-ot-layout.cc

 /*
  * Copyright © 1998-2004  David Turner and Werner Lemberg
  * Copyright © 2006  Behdad Esfahbod
  * Copyright © 2007,2008,2009  Red Hat, Inc.
  * Copyright © 2012,2013  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
@@ skipping 17 matching lines @@
  * Google Author(s): Behdad Esfahbod
  */
 
 #include "hb-open-type-private.hh"
 #include "hb-ot-layout-private.hh"
 
 #include "hb-ot-layout-gdef-table.hh"
 #include "hb-ot-layout-gsub-table.hh"
 #include "hb-ot-layout-gpos-table.hh"
 #include "hb-ot-layout-jstf-table.hh"
-#include "hb-ot-layout-math-table.hh"
 
 #include "hb-ot-map-private.hh"
 
 #include <stdlib.h>
 #include <string.h>
 
 
 HB_SHAPER_DATA_ENSURE_DECLARE(ot, face)
 
 hb_ot_layout_t *
@@ skipping 149 matching lines @@
 {
   if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GSUB);
   return *hb_ot_layout_from_face (face)->gsub;
 }
 static inline const OT::GPOS&
 _get_gpos (hb_face_t *face)
 {
   if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GPOS);
   return *hb_ot_layout_from_face (face)->gpos;
 }
-static inline const OT::MATH&
-_get_math (hb_face_t *face)
-{
-  if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::MATH);
-
-  hb_ot_layout_t * layout = hb_ot_layout_from_face (face);
-
-retry:
-  const OT::MATH *math = (const OT::MATH *) hb_atomic_ptr_get (&layout->math);
-
-  if (unlikely (!math))
-  {
-    hb_blob_t *blob = OT::Sanitizer<OT::MATH>::sanitize (face->reference_table (HB_OT_TAG_MATH));
-    math = OT::Sanitizer<OT::MATH>::lock_instance (blob);
-    if (!hb_atomic_ptr_cmpexch (&layout->math, NULL, math))
-    {
-      hb_blob_destroy (blob);
-      goto retry;
-    }
-    layout->math_blob = blob;
-  }
-
-  return *math;
-}
-
 
 /*
  * GDEF
  */
 
 hb_bool_t
 hb_ot_layout_has_glyph_classes (hb_face_t *face)
 {
   return _get_gdef (face).has_glyph_classes ();
 }
@@ skipping 332 matching lines @@
  * Since: 0.9.7
  **/
 unsigned int
 hb_ot_layout_feature_get_lookups (hb_face_t    *face,
                                   hb_tag_t      table_tag,
                                   unsigned int  feature_index,
                                   unsigned int  start_offset,
                                   unsigned int *lookup_count /* IN/OUT */,
                                   unsigned int *lookup_indexes /* OUT */)
 {
-  const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
-  const OT::Feature &f = g.get_feature (feature_index);
-
-  return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
+  return hb_ot_layout_feature_with_variations_get_lookups (face,
+                                                           table_tag,
+                                                           feature_index,
+                                                           HB_OT_LAYOUT_NO_VARIATIONS_INDEX,
+                                                           start_offset,
+                                                           lookup_count,
+                                                           lookup_indexes);
 }
 
 /**
  * hb_ot_layout_table_get_lookup_count:
  *
  * Since: 0.9.22
  **/
 unsigned int
 hb_ot_layout_table_get_lookup_count (hb_face_t    *face,
                                      hb_tag_t      table_tag)
@@ skipping 230 matching lines @@
     case HB_OT_TAG_GPOS:
     {
       const OT::PosLookup& l = hb_ot_layout_from_face (face)->gpos->get_lookup (lookup_index);
       l.collect_glyphs (&c);
       return;
     }
   }
 }
 
 
+/* Variations support */
+
+hb_bool_t
+hb_ot_layout_table_find_feature_variations (hb_face_t    *face,
+                                            hb_tag_t      table_tag,
+                                            const int    *coords,
+                                            unsigned int  num_coords,
+                                            unsigned int *variations_index /* out */)
+{
+  const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
+
+  return g.find_variations_index (coords, num_coords, variations_index);
+}
+
+unsigned int
+hb_ot_layout_feature_with_variations_get_lookups (hb_face_t    *face,
+                                                  hb_tag_t      table_tag,
+                                                  unsigned int  feature_index,
+                                                  unsigned int  variations_index,
+                                                  unsigned int  start_offset,
+                                                  unsigned int *lookup_count /* IN/OUT */,
+                                                  unsigned int *lookup_indexes /* OUT */)
+{
+  ASSERT_STATIC (OT::FeatureVariations::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_VARIATIONS_INDEX);
+  const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
+
+  const OT::Feature &f = g.get_feature_variation (feature_index, variations_index);
+
+  return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
+}
+
+
 /*
  * OT::GSUB
  */
 
 hb_bool_t
 hb_ot_layout_has_substitution (hb_face_t *face)
 {
   return &_get_gsub (face) != &OT::Null(OT::GSUB);
 }
 
@@ skipping 364 matching lines @@
   apply (proxy, plan, font, buffer);
 }
 
 HB_INTERNAL void
 hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c,
                                 const OT::SubstLookup &lookup,
                                 const hb_ot_layout_lookup_accelerator_t &accel)
 {
   apply_string<GSUBProxy> (c, lookup, accel);
 }
-
-
-/*
- * MATH
- */
-/* TODO Move this to hb-ot-math.cc and separate it from hb_ot_layout_t. */
-
-/**
- * hb_ot_math_has_data:
- * @face: #hb_face_t to test
- *
- * This function allows to verify the presence of an OpenType MATH table on the
- * face. If so, such a table will be loaded into memory and sanitized. You can
- * then safely call other functions for math layout and shaping.
- *
- * Return value: #TRUE if face has a MATH table and #FALSE otherwise
- *
- * Since: 1.3.3
- **/
-hb_bool_t
-hb_ot_math_has_data (hb_face_t *face)
-{
-  return &_get_math (face) != &OT::Null(OT::MATH);
-}
-
-/**
- * hb_ot_math_get_constant:
- * @font: #hb_font_t from which to retrieve the value
- * @constant: #hb_ot_math_constant_t the constant to retrieve
- *
- * This function returns the requested math constants as a #hb_position_t.
- * If the request constant is HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN,
- * HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN or
- * HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN then the return value is
- * actually an integer between 0 and 100 representing that percentage.
- *
- * Return value: the requested constant or 0
- *
- * Since: 1.3.3
- **/
-hb_position_t
-hb_ot_math_get_constant (hb_font_t *font,
-                         hb_ot_math_constant_t constant)
-{
-  const OT::MATH &math = _get_math (font->face);
-  return math.get_constant(constant, font);
-}
-
-/**
- * hb_ot_math_get_glyph_italics_correction:
- * @font: #hb_font_t from which to retrieve the value
- * @glyph: glyph index from which to retrieve the value
- *
- * Return value: the italics correction of the glyph or 0
- *
- * Since: 1.3.3
- **/
-hb_position_t
-hb_ot_math_get_glyph_italics_correction (hb_font_t *font,
-                                         hb_codepoint_t glyph)
-{
-  const OT::MATH &math = _get_math (font->face);
-  return math.get_math_glyph_info().get_italics_correction (glyph, font);
-}
-
-/**
- * hb_ot_math_get_glyph_top_accent_attachment:
- * @font: #hb_font_t from which to retrieve the value
- * @glyph: glyph index from which to retrieve the value
- *
- * Return value: the top accent attachment of the glyph or 0
- *
- * Since: 1.3.3
- **/
-hb_position_t
-hb_ot_math_get_glyph_top_accent_attachment (hb_font_t *font,
-                                            hb_codepoint_t glyph)
-{
-  const OT::MATH &math = _get_math (font->face);
-  return math.get_math_glyph_info().get_top_accent_attachment (glyph, font);
-}
-
-/**
- * hb_ot_math_is_glyph_extended_shape:
- * @font: a #hb_font_t to test
- * @glyph: a glyph index to test
- *
- * Return value: #TRUE if the glyph is an extended shape and #FALSE otherwise
- *
- * Since: 1.3.3
- **/
-hb_bool_t
-hb_ot_math_is_glyph_extended_shape (hb_face_t *face,
-                                    hb_codepoint_t glyph)
-{
-  const OT::MATH &math = _get_math (face);
-  return math.get_math_glyph_info().is_extended_shape (glyph);
-}
-
-/**
- * hb_ot_math_get_glyph_kerning:
- * @font: #hb_font_t from which to retrieve the value
- * @glyph: glyph index from which to retrieve the value
- * @kern: the #hb_ot_math_kern_t from which to retrieve the value
- * @correction_height: the correction height to use to determine the kerning.
- *
- * This function tries to retrieve the MathKern table for the specified font,
- * glyph and #hb_ot_math_kern_t. Then it browses the list of heights from the
- * MathKern table to find one value that is greater or equal to specified
- * correction_height. If one is found the corresponding value from the list of
- * kerns is returned and otherwise the last kern value is returned.
- *
- * Return value: requested kerning or 0
- *
- * Since: 1.3.3
- **/
-hb_position_t
-hb_ot_math_get_glyph_kerning (hb_font_t *font,
-                              hb_codepoint_t glyph,
-                              hb_ot_math_kern_t kern,
-                              hb_position_t correction_height)
-{
-  const OT::MATH &math = _get_math (font->face);
-  return math.get_math_glyph_info().get_kerning (glyph, kern, correction_height, font);
-}
-
-/**
- * hb_ot_math_get_glyph_variants:
- * @font: #hb_font_t from which to retrieve the values
- * @glyph: index of the glyph to stretch
- * @direction: direction of the stretching
- * @start_offset: offset of the first variant to retrieve
- * @variants_count: maximum number of variants to retrieve after start_offset
- * (IN) and actual number of variants retrieved (OUT)
- * @variants: array of size at least @variants_count to store the result
- *
- * This function tries to retrieve the MathGlyphConstruction for the specified
- * font, glyph and direction. Note that only the value of
- * #HB_DIRECTION_IS_HORIZONTAL is considered. It provides the corresponding list
- * of size variants as an array of hb_ot_math_glyph_variant_t structs.
- *
- * Return value: the total number of size variants available or 0
- *
- * Since: 1.3.3
- **/
-unsigned int
-hb_ot_math_get_glyph_variants (hb_font_t *font,
-                               hb_codepoint_t glyph,
-                               hb_direction_t direction,
-                               unsigned int start_offset,
-                               unsigned int *variants_count, /* IN/OUT */
-                               hb_ot_math_glyph_variant_t *variants /* OUT */)
-{
-  const OT::MATH &math = _get_math (font->face);
-  return math.get_math_variants().get_glyph_variants (glyph, direction, font,
-                                                      start_offset,
-                                                      variants_count,
-                                                      variants);
-}
-
-/**
- * hb_ot_math_get_min_connector_overlap:
- * @font: #hb_font_t from which to retrieve the value
- * @direction: direction of the stretching
- *
- * This function tries to retrieve the MathVariants table for the specified
- * font and returns the minimum overlap of connecting glyphs to draw a glyph
- * assembly in the specified direction. Note that only the value of
- * #HB_DIRECTION_IS_HORIZONTAL is considered.
- *
- * Return value: requested min connector overlap or 0
- *
- * Since: 1.3.3
- **/
-hb_position_t
-hb_ot_math_get_min_connector_overlap (hb_font_t *font,
-                                      hb_direction_t direction)
-{
-  const OT::MATH &math = _get_math (font->face);
-  return math.get_math_variants().get_min_connector_overlap (direction, font);
-}
-
-/**
- * hb_ot_math_get_glyph_assembly:
- * @font: #hb_font_t from which to retrieve the values
- * @glyph: index of the glyph to stretch
- * @direction: direction of the stretching
- * @start_offset: offset of the first glyph part to retrieve
- * @parts_count: maximum number of glyph parts to retrieve after start_offset
- * (IN) and actual number of parts retrieved (OUT)
- * @parts: array of size at least @parts_count to store the result
- * @italics_correction: italic correction of the glyph assembly
- *
- * This function tries to retrieve the GlyphAssembly for the specified font,
- * glyph and direction. Note that only the value of #HB_DIRECTION_IS_HORIZONTAL
- * is considered. It provides the information necessary to draw the glyph
- * assembly as an array of #hb_ot_math_glyph_part_t.
- *
- * Return value: the total number of parts in the glyph assembly
- *
- * Since: 1.3.3
- **/
-unsigned int
-hb_ot_math_get_glyph_assembly (hb_font_t *font,
-                               hb_codepoint_t glyph,
-                               hb_direction_t direction,
-                               unsigned int start_offset,
-                               unsigned int *parts_count, /* IN/OUT */
-                               hb_ot_math_glyph_part_t *parts, /* OUT */
-                               hb_position_t *italics_correction /* OUT */)
-{
-  const OT::MATH &math = _get_math (font->face);
-  return math.get_math_variants().get_glyph_parts (glyph, direction, font,
-                                                   start_offset,
-                                                   parts_count,
-                                                   parts,
-                                                   italics_correction);
-}