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