Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 423 insertions, 0 deletions

diff --git a/gfx/harfbuzz/src/OT/glyf/CompositeGlyph.hh b/gfx/harfbuzz/src/OT/glyf/CompositeGlyph.hh
new file mode 100644
index 0000000000..d81fadf7c8
--- /dev/null
+++ b/gfx/harfbuzz/src/OT/glyf/CompositeGlyph.hh
@@ -0,0 +1,423 @@
+#ifndef OT_GLYF_COMPOSITEGLYPH_HH
+#define OT_GLYF_COMPOSITEGLYPH_HH
+
+
+#include "../../hb-open-type.hh"
+#include "composite-iter.hh"
+
+
+namespace OT {
+namespace glyf_impl {
+
+
+struct CompositeGlyphRecord
+{
+  protected:
+  enum composite_glyph_flag_t
+  {
+    ARG_1_AND_2_ARE_WORDS	= 0x0001,
+    ARGS_ARE_XY_VALUES		= 0x0002,
+    ROUND_XY_TO_GRID		= 0x0004,
+    WE_HAVE_A_SCALE		= 0x0008,
+    MORE_COMPONENTS		= 0x0020,
+    WE_HAVE_AN_X_AND_Y_SCALE	= 0x0040,
+    WE_HAVE_A_TWO_BY_TWO	= 0x0080,
+    WE_HAVE_INSTRUCTIONS	= 0x0100,
+    USE_MY_METRICS		= 0x0200,
+    OVERLAP_COMPOUND		= 0x0400,
+    SCALED_COMPONENT_OFFSET	= 0x0800,
+    UNSCALED_COMPONENT_OFFSET	= 0x1000,
+#ifndef HB_NO_BEYOND_64K
+    GID_IS_24BIT		= 0x2000
+#endif
+  };
+
+  public:
+  unsigned int get_size () const
+  {
+    unsigned int size = min_size;
+    /* glyphIndex is 24bit instead of 16bit */
+#ifndef HB_NO_BEYOND_64K
+    if (flags & GID_IS_24BIT) size += HBGlyphID24::static_size - HBGlyphID16::static_size;
+#endif
+    /* arg1 and 2 are int16 */
+    if (flags & ARG_1_AND_2_ARE_WORDS) size += 4;
+    /* arg1 and 2 are int8 */
+    else size += 2;
+
+    /* One x 16 bit (scale) */
+    if (flags & WE_HAVE_A_SCALE) size += 2;
+    /* Two x 16 bit (xscale, yscale) */
+    else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) size += 4;
+    /* Four x 16 bit (xscale, scale01, scale10, yscale) */
+    else if (flags & WE_HAVE_A_TWO_BY_TWO) size += 8;
+
+    return size;
+  }
+
+  void drop_instructions_flag ()  { flags = (uint16_t) flags & ~WE_HAVE_INSTRUCTIONS; }
+  void set_overlaps_flag ()
+  {
+    flags = (uint16_t) flags | OVERLAP_COMPOUND;
+  }
+
+  bool has_instructions ()  const { return   flags & WE_HAVE_INSTRUCTIONS; }
+
+  bool has_more ()          const { return   flags & MORE_COMPONENTS; }
+  bool is_use_my_metrics () const { return   flags & USE_MY_METRICS; }
+  bool is_anchored ()       const { return !(flags & ARGS_ARE_XY_VALUES); }
+  void get_anchor_points (unsigned int &point1, unsigned int &point2) const
+  {
+    const auto *p = &StructAfter<const HBUINT8> (flags);
+#ifndef HB_NO_BEYOND_64K
+    if (flags & GID_IS_24BIT)
+      p += HBGlyphID24::static_size;
+    else
+#endif
+      p += HBGlyphID16::static_size;
+    if (flags & ARG_1_AND_2_ARE_WORDS)
+    {
+      point1 = ((const HBUINT16 *) p)[0];
+      point2 = ((const HBUINT16 *) p)[1];
+    }
+    else
+    {
+      point1 = p[0];
+      point2 = p[1];
+    }
+  }
+
+  static void transform (const float (&matrix)[4],
+			 hb_array_t<contour_point_t> points)
+  {
+    auto arrayZ = points.arrayZ;
+    unsigned count = points.length;
+
+    if (matrix[0] != 1.f || matrix[1] != 0.f ||
+	matrix[2] != 0.f || matrix[3] != 1.f)
+      for (unsigned i = 0; i < count; i++)
+        arrayZ[i].transform (matrix);
+  }
+
+  static void translate (const contour_point_t &trans,
+			 hb_array_t<contour_point_t> points)
+  {
+    auto arrayZ = points.arrayZ;
+    unsigned count = points.length;
+
+    if (trans.x != 0.f || trans.y != 0.f)
+      for (unsigned i = 0; i < count; i++)
+        arrayZ[i].translate (trans);
+  }
+
+  void transform_points (hb_array_t<contour_point_t> points,
+			 const float (&matrix)[4],
+			 const contour_point_t &trans) const
+  {
+    if (scaled_offsets ())
+    {
+      translate (trans, points);
+      transform (matrix, points);
+    }
+    else
+    {
+      transform (matrix, points);
+      translate (trans, points);
+    }
+  }
+
+  bool get_points (contour_point_vector_t &points) const
+  {
+    float matrix[4];
+    contour_point_t trans;
+    get_transformation (matrix, trans);
+    points.alloc (points.length + 4); // For phantom points
+    if (unlikely (!points.resize (points.length + 1))) return false;
+    points.arrayZ[points.length - 1] = trans;
+    return true;
+  }
+
+  unsigned compile_with_point (const contour_point_t &point,
+                               char *out) const
+  {
+    const HBINT8 *p = &StructAfter<const HBINT8> (flags);
+#ifndef HB_NO_BEYOND_64K
+    if (flags & GID_IS_24BIT)
+      p += HBGlyphID24::static_size;
+    else
+#endif
+      p += HBGlyphID16::static_size;
+
+    unsigned len = get_size ();
+    unsigned len_before_val = (const char *)p - (const char *)this;
+    if (flags & ARG_1_AND_2_ARE_WORDS)
+    {
+      // no overflow, copy value
+      hb_memcpy (out, this, len);
+
+      HBINT16 *o = reinterpret_cast<HBINT16 *> (out + len_before_val);
+      o[0] = roundf (point.x);
+      o[1] = roundf (point.y);
+    }
+    else
+    {
+      int new_x = roundf (point.x);
+      int new_y = roundf (point.y);
+      if (new_x <= 127 && new_x >= -128 &&
+          new_y <= 127 && new_y >= -128)
+      {
+        hb_memcpy (out, this, len);
+        HBINT8 *o = reinterpret_cast<HBINT8 *> (out + len_before_val);
+        o[0] = new_x;
+        o[1] = new_y;
+      }
+      else
+      {
+        // new point value has an int8 overflow
+        hb_memcpy (out, this, len_before_val);
+        
+        //update flags
+        CompositeGlyphRecord *o = reinterpret_cast<CompositeGlyphRecord *> (out);
+        o->flags = flags | ARG_1_AND_2_ARE_WORDS;
+        out += len_before_val;
+
+        HBINT16 new_value;
+        new_value = new_x;
+        hb_memcpy (out, &new_value, HBINT16::static_size);
+        out += HBINT16::static_size;
+
+        new_value = new_y;
+        hb_memcpy (out, &new_value, HBINT16::static_size);
+        out += HBINT16::static_size;
+
+        hb_memcpy (out, p+2, len - len_before_val - 2);
+        len += 2;
+      }
+    }
+    return len;
+  }
+
+  protected:
+  bool scaled_offsets () const
+  { return (flags & (SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET)) == SCALED_COMPONENT_OFFSET; }
+
+  public:
+  bool get_transformation (float (&matrix)[4], contour_point_t &trans) const
+  {
+    matrix[0] = matrix[3] = 1.f;
+    matrix[1] = matrix[2] = 0.f;
+
+    const auto *p = &StructAfter<const HBINT8> (flags);
+#ifndef HB_NO_BEYOND_64K
+    if (flags & GID_IS_24BIT)
+      p += HBGlyphID24::static_size;
+    else
+#endif
+      p += HBGlyphID16::static_size;
+    int tx, ty;
+    if (flags & ARG_1_AND_2_ARE_WORDS)
+    {
+      tx = *(const HBINT16 *) p;
+      p += HBINT16::static_size;
+      ty = *(const HBINT16 *) p;
+      p += HBINT16::static_size;
+    }
+    else
+    {
+      tx = *p++;
+      ty = *p++;
+    }
+    if (is_anchored ()) tx = ty = 0;
+
+    trans.init ((float) tx, (float) ty);
+
+    {
+      const F2DOT14 *points = (const F2DOT14 *) p;
+      if (flags & WE_HAVE_A_SCALE)
+      {
+	matrix[0] = matrix[3] = points[0].to_float ();
+	return true;
+      }
+      else if (flags & WE_HAVE_AN_X_AND_Y_SCALE)
+      {
+	matrix[0] = points[0].to_float ();
+	matrix[3] = points[1].to_float ();
+	return true;
+      }
+      else if (flags & WE_HAVE_A_TWO_BY_TWO)
+      {
+	matrix[0] = points[0].to_float ();
+	matrix[1] = points[1].to_float ();
+	matrix[2] = points[2].to_float ();
+	matrix[3] = points[3].to_float ();
+	return true;
+      }
+    }
+    return tx || ty;
+  }
+
+  hb_codepoint_t get_gid () const
+  {
+#ifndef HB_NO_BEYOND_64K
+    if (flags & GID_IS_24BIT)
+      return StructAfter<const HBGlyphID24> (flags);
+    else
+#endif
+      return StructAfter<const HBGlyphID16> (flags);
+  }
+  void set_gid (hb_codepoint_t gid)
+  {
+#ifndef HB_NO_BEYOND_64K
+    if (flags & GID_IS_24BIT)
+      StructAfter<HBGlyphID24> (flags) = gid;
+    else
+#endif
+      /* TODO assert? */
+      StructAfter<HBGlyphID16> (flags) = gid;
+  }
+
+#ifndef HB_NO_BEYOND_64K
+  void lower_gid_24_to_16 ()
+  {
+    hb_codepoint_t gid = get_gid ();
+    if (!(flags & GID_IS_24BIT) || gid > 0xFFFFu)
+      return;
+
+    /* Lower the flag and move the rest of the struct down. */
+
+    unsigned size = get_size ();
+    char *end = (char *) this + size;
+    char *p = &StructAfter<char> (flags);
+    p += HBGlyphID24::static_size;
+
+    flags = flags & ~GID_IS_24BIT;
+    set_gid (gid);
+
+    memmove (p - HBGlyphID24::static_size + HBGlyphID16::static_size, p, end - p);
+  }
+#endif
+
+  protected:
+  HBUINT16	flags;
+  HBUINT24	pad;
+  public:
+  DEFINE_SIZE_MIN (4);
+};
+
+using composite_iter_t = composite_iter_tmpl<CompositeGlyphRecord>;
+
+struct CompositeGlyph
+{
+  const GlyphHeader &header;
+  hb_bytes_t bytes;
+  CompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) :
+    header (header_), bytes (bytes_) {}
+
+  composite_iter_t iter () const
+  { return composite_iter_t (bytes, &StructAfter<CompositeGlyphRecord, GlyphHeader> (header)); }
+
+  unsigned int instructions_length (hb_bytes_t bytes) const
+  {
+    unsigned int start = bytes.length;
+    unsigned int end = bytes.length;
+    const CompositeGlyphRecord *last = nullptr;
+    for (auto &item : iter ())
+      last = &item;
+    if (unlikely (!last)) return 0;
+
+    if (last->has_instructions ())
+      start = (char *) last - &bytes + last->get_size ();
+    if (unlikely (start > end)) return 0;
+    return end - start;
+  }
+
+  /* Trimming for composites not implemented.
+   * If removing hints it falls out of that. */
+  const hb_bytes_t trim_padding () const { return bytes; }
+
+  void drop_hints ()
+  {
+    for (const auto &_ : iter ())
+      const_cast<CompositeGlyphRecord &> (_).drop_instructions_flag ();
+  }
+
+  /* Chop instructions off the end */
+  void drop_hints_bytes (hb_bytes_t &dest_start) const
+  { dest_start = bytes.sub_array (0, bytes.length - instructions_length (bytes)); }
+
+  void set_overlaps_flag ()
+  {
+    CompositeGlyphRecord& glyph_chain = const_cast<CompositeGlyphRecord &> (
+	StructAfter<CompositeGlyphRecord, GlyphHeader> (header));
+    if (!bytes.check_range(&glyph_chain, CompositeGlyphRecord::min_size))
+      return;
+    glyph_chain.set_overlaps_flag ();
+  }
+
+  bool compile_bytes_with_deltas (const hb_bytes_t &source_bytes,
+                                  const contour_point_vector_t &points_with_deltas,
+                                  hb_bytes_t &dest_bytes /* OUT */)
+  {
+    if (source_bytes.length <= GlyphHeader::static_size ||
+        header.numberOfContours != -1)
+    {
+      dest_bytes = hb_bytes_t ();
+      return true;
+    }
+
+    unsigned source_len = source_bytes.length - GlyphHeader::static_size;
+
+    /* try to allocate more memories than source glyph bytes
+     * in case that there might be an overflow for int8 value
+     * and we would need to use int16 instead */
+    char *o = (char *) hb_calloc (source_len * 2, sizeof (char));
+    if (unlikely (!o)) return false;
+
+    const CompositeGlyphRecord *c = reinterpret_cast<const CompositeGlyphRecord *> (source_bytes.arrayZ + GlyphHeader::static_size);
+    auto it = composite_iter_t (hb_bytes_t ((const char *)c, source_len), c);
+
+    char *p = o;
+    unsigned i = 0, source_comp_len = 0;
+    for (const auto &component : it)
+    {
+      /* last 4 points in points_with_deltas are phantom points and should not be included */
+      if (i >= points_with_deltas.length - 4) {
+        free (o);
+        return false;
+      }
+
+      unsigned comp_len = component.get_size ();
+      if (component.is_anchored ())
+      {
+        hb_memcpy (p, &component, comp_len);
+        p += comp_len;
+      }
+      else
+      {
+        unsigned new_len = component.compile_with_point (points_with_deltas[i], p);
+        p += new_len;
+      }
+      i++;
+      source_comp_len += comp_len;
+    }
+
+    //copy instructions if any
+    if (source_len > source_comp_len)
+    {
+      unsigned instr_len = source_len - source_comp_len;
+      hb_memcpy (p, (const char *)c + source_comp_len, instr_len);
+      p += instr_len;
+    }
+
+    unsigned len = p - o;
+    dest_bytes = hb_bytes_t (o, len);
+    return true;
+  }
+};
+
+
+} /* namespace glyf_impl */
+} /* namespace OT */
+
+
+#endif /* OT_GLYF_COMPOSITEGLYPH_HH */