[Complex Text Layouts] Add third-party TextServer dependencies (ICU, HarfBuzz, Graphite).

1 files changed, 179 insertions, 0 deletions

diff --git a/thirdparty/harfbuzz/src/hb-ot-head-table.hh b/thirdparty/harfbuzz/src/hb-ot-head-table.hh
new file mode 100644
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+++ b/thirdparty/harfbuzz/src/hb-ot-head-table.hh
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+/*
+ * Copyright © 2010  Red Hat, Inc.
+ * Copyright © 2012  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_OT_HEAD_TABLE_HH
+#define HB_OT_HEAD_TABLE_HH
+
+#include "hb-open-type.hh"
+
+/*
+ * head -- Font Header
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/head
+ */
+#define HB_OT_TAG_head HB_TAG('h','e','a','d')
+
+
+namespace OT {
+
+
+struct head
+{
+  friend struct OffsetTable;
+
+  static constexpr hb_tag_t tableTag = HB_OT_TAG_head;
+
+  unsigned int get_upem () const
+  {
+    unsigned int upem = unitsPerEm;
+    /* If no valid head table found, assume 1000, which matches typical Type1 usage. */
+    return 16 <= upem && upem <= 16384 ? upem : 1000;
+  }
+
+  bool serialize (hb_serialize_context_t *c) const
+  {
+    TRACE_SERIALIZE (this);
+    return_trace ((bool) c->embed (this));
+  }
+
+  bool subset (hb_subset_context_t *c) const
+  {
+    TRACE_SUBSET (this);
+    return_trace (serialize (c->serializer));
+  }
+
+  enum mac_style_flag_t {
+    BOLD	= 1u<<0,
+    ITALIC	= 1u<<1,
+    UNDERLINE	= 1u<<2,
+    OUTLINE	= 1u<<3,
+    SHADOW	= 1u<<4,
+    CONDENSED	= 1u<<5
+  };
+
+  bool is_bold () const      { return macStyle & BOLD; }
+  bool is_italic () const    { return macStyle & ITALIC; }
+  bool is_condensed () const { return macStyle & CONDENSED; }
+
+  bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this) &&
+		  version.major == 1 &&
+		  magicNumber == 0x5F0F3CF5u);
+  }
+
+  protected:
+  FixedVersion<>version;		/* Version of the head table--currently
+					 * 0x00010000u for version 1.0. */
+  FixedVersion<>fontRevision;		/* Set by font manufacturer. */
+  HBUINT32	checkSumAdjustment;	/* To compute: set it to 0, sum the
+					 * entire font as HBUINT32, then store
+					 * 0xB1B0AFBAu - sum. */
+  HBUINT32	magicNumber;		/* Set to 0x5F0F3CF5u. */
+  HBUINT16	flags;			/* Bit 0: Baseline for font at y=0;
+					 * Bit 1: Left sidebearing point at x=0;
+					 * Bit 2: Instructions may depend on point size;
+					 * Bit 3: Force ppem to integer values for all
+					 *   internal scaler math; may use fractional
+					 *   ppem sizes if this bit is clear;
+					 * Bit 4: Instructions may alter advance width
+					 *   (the advance widths might not scale linearly);
+					 * Bits 5-10: These should be set according to
+					 *   Apple's specification. However, they are not
+					 *   implemented in OpenType.
+					 * Bit 5: This bit should be set in fonts that are
+					 *   intended to e laid out vertically, and in
+					 *   which the glyphs have been drawn such that an
+					 *   x-coordinate of 0 corresponds to the desired
+					 *   vertical baseline.
+					 * Bit 6: This bit must be set to zero.
+					 * Bit 7: This bit should be set if the font
+					 *   requires layout for correct linguistic
+					 *   rendering (e.g. Arabic fonts).
+					 * Bit 8: This bit should be set for a GX font
+					 *   which has one or more metamorphosis effects
+					 *   designated as happening by default.
+					 * Bit 9: This bit should be set if the font
+					 *   contains any strong right-to-left glyphs.
+					 * Bit 10: This bit should be set if the font
+					 *   contains Indic-style rearrangement effects.
+					 * Bit 11: Font data is 'lossless,' as a result
+					 *   of having been compressed and decompressed
+					 *   with the Agfa MicroType Express engine.
+					 * Bit 12: Font converted (produce compatible metrics)
+					 * Bit 13: Font optimized for ClearType™.
+					 *   Note, fonts that rely on embedded bitmaps (EBDT)
+					 *   for rendering should not be considered optimized
+					 *   for ClearType, and therefore should keep this bit
+					 *   cleared.
+					 * Bit 14: Last Resort font. If set, indicates that
+					 * the glyphs encoded in the cmap subtables are simply
+					 * generic symbolic representations of code point
+					 * ranges and don’t truly represent support for those
+					 * code points. If unset, indicates that the glyphs
+					 * encoded in the cmap subtables represent proper
+					 * support for those code points.
+					 * Bit 15: Reserved, set to 0. */
+  HBUINT16	unitsPerEm;		/* Valid range is from 16 to 16384. This value
+					 * should be a power of 2 for fonts that have
+					 * TrueType outlines. */
+  LONGDATETIME	created;		/* Number of seconds since 12:00 midnight,
+					   January 1, 1904. 64-bit integer */
+  LONGDATETIME	modified;		/* Number of seconds since 12:00 midnight,
+					   January 1, 1904. 64-bit integer */
+  HBINT16	xMin;			/* For all glyph bounding boxes. */
+  HBINT16	yMin;			/* For all glyph bounding boxes. */
+  HBINT16	xMax;			/* For all glyph bounding boxes. */
+  HBINT16	yMax;			/* For all glyph bounding boxes. */
+  HBUINT16	macStyle;		/* Bit 0: Bold (if set to 1);
+					 * Bit 1: Italic (if set to 1)
+					 * Bit 2: Underline (if set to 1)
+					 * Bit 3: Outline (if set to 1)
+					 * Bit 4: Shadow (if set to 1)
+					 * Bit 5: Condensed (if set to 1)
+					 * Bit 6: Extended (if set to 1)
+					 * Bits 7-15: Reserved (set to 0). */
+  HBUINT16	lowestRecPPEM;		/* Smallest readable size in pixels. */
+  HBINT16	fontDirectionHint;	/* Deprecated (Set to 2).
+					 * 0: Fully mixed directional glyphs;
+					 * 1: Only strongly left to right;
+					 * 2: Like 1 but also contains neutrals;
+					 * -1: Only strongly right to left;
+					 * -2: Like -1 but also contains neutrals. */
+  public:
+  HBUINT16	indexToLocFormat;	/* 0 for short offsets, 1 for long. */
+  HBUINT16	glyphDataFormat;	/* 0 for current format. */
+
+  DEFINE_SIZE_STATIC (54);
+};
+
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_HEAD_TABLE_HH */