1719 lines
51 KiB
C++
1719 lines
51 KiB
C++
/*
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* Copyright © 2007,2008,2009,2010 Red Hat, Inc.
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* Copyright © 2010,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_LAYOUT_GPOS_TABLE_HH
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#define HB_OT_LAYOUT_GPOS_TABLE_HH
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#include "hb-ot-layout-gsubgpos-private.hh"
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namespace OT {
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/* buffer **position** var allocations */
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#define attach_lookback() var.u16[0] /* number of glyphs to go back to attach this glyph to its base */
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#define cursive_chain() var.i16[1] /* character to which this connects, may be positive or negative */
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/* Shared Tables: ValueRecord, Anchor Table, and MarkArray */
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typedef USHORT Value;
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typedef Value ValueRecord[VAR];
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struct ValueFormat : USHORT
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{
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enum Flags {
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xPlacement = 0x0001, /* Includes horizontal adjustment for placement */
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yPlacement = 0x0002, /* Includes vertical adjustment for placement */
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xAdvance = 0x0004, /* Includes horizontal adjustment for advance */
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yAdvance = 0x0008, /* Includes vertical adjustment for advance */
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xPlaDevice = 0x0010, /* Includes horizontal Device table for placement */
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yPlaDevice = 0x0020, /* Includes vertical Device table for placement */
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xAdvDevice = 0x0040, /* Includes horizontal Device table for advance */
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yAdvDevice = 0x0080, /* Includes vertical Device table for advance */
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ignored = 0x0F00, /* Was used in TrueType Open for MM fonts */
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reserved = 0xF000, /* For future use */
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devices = 0x00F0 /* Mask for having any Device table */
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};
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/* All fields are options. Only those available advance the value pointer. */
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#if 0
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SHORT xPlacement; /* Horizontal adjustment for
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* placement--in design units */
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SHORT yPlacement; /* Vertical adjustment for
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* placement--in design units */
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SHORT xAdvance; /* Horizontal adjustment for
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* advance--in design units (only used
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* for horizontal writing) */
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SHORT yAdvance; /* Vertical adjustment for advance--in
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* design units (only used for vertical
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* writing) */
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Offset xPlaDevice; /* Offset to Device table for
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* horizontal placement--measured from
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* beginning of PosTable (may be NULL) */
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Offset yPlaDevice; /* Offset to Device table for vertical
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* placement--measured from beginning
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* of PosTable (may be NULL) */
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Offset xAdvDevice; /* Offset to Device table for
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* horizontal advance--measured from
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* beginning of PosTable (may be NULL) */
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Offset yAdvDevice; /* Offset to Device table for vertical
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* advance--measured from beginning of
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* PosTable (may be NULL) */
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#endif
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inline unsigned int get_len (void) const
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{ return _hb_popcount32 ((unsigned int) *this); }
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inline unsigned int get_size (void) const
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{ return get_len () * Value::static_size; }
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void apply_value (hb_font_t *font,
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hb_direction_t direction,
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const void *base,
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const Value *values,
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hb_glyph_position_t &glyph_pos) const
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{
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unsigned int x_ppem, y_ppem;
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unsigned int format = *this;
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hb_bool_t horizontal = HB_DIRECTION_IS_HORIZONTAL (direction);
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if (!format) return;
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if (format & xPlacement) glyph_pos.x_offset += font->em_scale_x (get_short (values++));
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if (format & yPlacement) glyph_pos.y_offset += font->em_scale_y (get_short (values++));
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if (format & xAdvance) {
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if (likely (horizontal)) glyph_pos.x_advance += font->em_scale_x (get_short (values++)); else values++;
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}
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/* y_advance values grow downward but font-space grows upward, hence negation */
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if (format & yAdvance) {
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if (unlikely (!horizontal)) glyph_pos.y_advance -= font->em_scale_y (get_short (values++)); else values++;
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}
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if (!has_device ()) return;
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x_ppem = font->x_ppem;
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y_ppem = font->y_ppem;
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if (!x_ppem && !y_ppem) return;
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/* pixel -> fractional pixel */
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if (format & xPlaDevice) {
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if (x_ppem) glyph_pos.x_offset += (base + get_device (values++)).get_x_delta (font); else values++;
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}
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if (format & yPlaDevice) {
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if (y_ppem) glyph_pos.y_offset += (base + get_device (values++)).get_y_delta (font); else values++;
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}
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if (format & xAdvDevice) {
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if (horizontal && x_ppem) glyph_pos.x_advance += (base + get_device (values++)).get_x_delta (font); else values++;
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}
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if (format & yAdvDevice) {
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/* y_advance values grow downward but font-space grows upward, hence negation */
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if (!horizontal && y_ppem) glyph_pos.y_advance -= (base + get_device (values++)).get_y_delta (font); else values++;
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}
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}
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private:
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inline bool sanitize_value_devices (hb_sanitize_context_t *c, void *base, Value *values) {
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unsigned int format = *this;
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if (format & xPlacement) values++;
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if (format & yPlacement) values++;
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if (format & xAdvance) values++;
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if (format & yAdvance) values++;
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if ((format & xPlaDevice) && !get_device (values++).sanitize (c, base)) return false;
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if ((format & yPlaDevice) && !get_device (values++).sanitize (c, base)) return false;
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if ((format & xAdvDevice) && !get_device (values++).sanitize (c, base)) return false;
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if ((format & yAdvDevice) && !get_device (values++).sanitize (c, base)) return false;
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return true;
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}
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static inline OffsetTo<Device>& get_device (Value* value)
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{ return *CastP<OffsetTo<Device> > (value); }
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static inline const OffsetTo<Device>& get_device (const Value* value)
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{ return *CastP<OffsetTo<Device> > (value); }
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static inline const SHORT& get_short (const Value* value)
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{ return *CastP<SHORT> (value); }
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public:
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inline bool has_device (void) const {
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unsigned int format = *this;
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return (format & devices) != 0;
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}
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inline bool sanitize_value (hb_sanitize_context_t *c, void *base, Value *values) {
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TRACE_SANITIZE ();
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return TRACE_RETURN (c->check_range (values, get_size ()) && (!has_device () || sanitize_value_devices (c, base, values)));
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}
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inline bool sanitize_values (hb_sanitize_context_t *c, void *base, Value *values, unsigned int count) {
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TRACE_SANITIZE ();
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unsigned int len = get_len ();
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if (!c->check_array (values, get_size (), count)) return TRACE_RETURN (false);
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if (!has_device ()) return TRACE_RETURN (true);
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for (unsigned int i = 0; i < count; i++) {
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if (!sanitize_value_devices (c, base, values))
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return TRACE_RETURN (false);
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values += len;
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}
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return TRACE_RETURN (true);
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}
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/* Just sanitize referenced Device tables. Doesn't check the values themselves. */
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inline bool sanitize_values_stride_unsafe (hb_sanitize_context_t *c, void *base, Value *values, unsigned int count, unsigned int stride) {
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TRACE_SANITIZE ();
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if (!has_device ()) return TRACE_RETURN (true);
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for (unsigned int i = 0; i < count; i++) {
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if (!sanitize_value_devices (c, base, values))
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return TRACE_RETURN (false);
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values += stride;
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}
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return TRACE_RETURN (true);
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}
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};
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struct AnchorFormat1
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{
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friend struct Anchor;
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private:
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inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id HB_UNUSED,
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hb_position_t *x, hb_position_t *y) const
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{
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*x = font->em_scale_x (xCoordinate);
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*y = font->em_scale_y (yCoordinate);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return TRACE_RETURN (c->check_struct (this));
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}
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protected:
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USHORT format; /* Format identifier--format = 1 */
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SHORT xCoordinate; /* Horizontal value--in design units */
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SHORT yCoordinate; /* Vertical value--in design units */
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public:
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DEFINE_SIZE_STATIC (6);
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};
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struct AnchorFormat2
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{
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friend struct Anchor;
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private:
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inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id,
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hb_position_t *x, hb_position_t *y) const
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{
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unsigned int x_ppem = font->x_ppem;
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unsigned int y_ppem = font->y_ppem;
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hb_position_t cx, cy;
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hb_bool_t ret = false;
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if (x_ppem || y_ppem)
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ret = font->get_glyph_contour_point_for_origin (glyph_id, anchorPoint, HB_DIRECTION_LTR, &cx, &cy);
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*x = x_ppem && ret ? cx : font->em_scale_x (xCoordinate);
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*y = y_ppem && ret ? cy : font->em_scale_y (yCoordinate);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return TRACE_RETURN (c->check_struct (this));
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}
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protected:
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USHORT format; /* Format identifier--format = 2 */
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SHORT xCoordinate; /* Horizontal value--in design units */
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SHORT yCoordinate; /* Vertical value--in design units */
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USHORT anchorPoint; /* Index to glyph contour point */
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public:
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DEFINE_SIZE_STATIC (8);
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};
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struct AnchorFormat3
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{
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friend struct Anchor;
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private:
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inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id HB_UNUSED,
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hb_position_t *x, hb_position_t *y) const
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{
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*x = font->em_scale_x (xCoordinate);
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*y = font->em_scale_y (yCoordinate);
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if (font->x_ppem)
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*x += (this+xDeviceTable).get_x_delta (font);
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if (font->y_ppem)
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*y += (this+yDeviceTable).get_x_delta (font);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return TRACE_RETURN (c->check_struct (this) && xDeviceTable.sanitize (c, this) && yDeviceTable.sanitize (c, this));
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}
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protected:
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USHORT format; /* Format identifier--format = 3 */
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SHORT xCoordinate; /* Horizontal value--in design units */
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SHORT yCoordinate; /* Vertical value--in design units */
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OffsetTo<Device>
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xDeviceTable; /* Offset to Device table for X
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* coordinate-- from beginning of
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* Anchor table (may be NULL) */
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OffsetTo<Device>
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yDeviceTable; /* Offset to Device table for Y
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* coordinate-- from beginning of
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* Anchor table (may be NULL) */
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public:
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DEFINE_SIZE_STATIC (10);
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};
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struct Anchor
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{
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inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id,
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hb_position_t *x, hb_position_t *y) const
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{
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*x = *y = 0;
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switch (u.format) {
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case 1: u.format1.get_anchor (font, glyph_id, x, y); return;
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case 2: u.format2.get_anchor (font, glyph_id, x, y); return;
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case 3: u.format3.get_anchor (font, glyph_id, x, y); return;
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default: return;
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}
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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if (!u.format.sanitize (c)) return TRACE_RETURN (false);
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switch (u.format) {
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case 1: return TRACE_RETURN (u.format1.sanitize (c));
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case 2: return TRACE_RETURN (u.format2.sanitize (c));
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case 3: return TRACE_RETURN (u.format3.sanitize (c));
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default:return TRACE_RETURN (true);
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}
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}
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protected:
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union {
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USHORT format; /* Format identifier */
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AnchorFormat1 format1;
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AnchorFormat2 format2;
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AnchorFormat3 format3;
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} u;
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public:
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DEFINE_SIZE_UNION (2, format);
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};
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struct AnchorMatrix
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{
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inline const Anchor& get_anchor (unsigned int row, unsigned int col, unsigned int cols) const {
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if (unlikely (row >= rows || col >= cols)) return Null(Anchor);
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return this+matrix[row * cols + col];
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}
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inline bool sanitize (hb_sanitize_context_t *c, unsigned int cols) {
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TRACE_SANITIZE ();
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if (!c->check_struct (this)) return TRACE_RETURN (false);
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if (unlikely (rows > 0 && cols >= ((unsigned int) -1) / rows)) return TRACE_RETURN (false);
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unsigned int count = rows * cols;
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if (!c->check_array (matrix, matrix[0].static_size, count)) return TRACE_RETURN (false);
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for (unsigned int i = 0; i < count; i++)
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if (!matrix[i].sanitize (c, this)) return TRACE_RETURN (false);
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return TRACE_RETURN (true);
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}
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USHORT rows; /* Number of rows */
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protected:
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OffsetTo<Anchor>
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matrix[VAR]; /* Matrix of offsets to Anchor tables--
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* from beginning of AnchorMatrix table */
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public:
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DEFINE_SIZE_ARRAY (2, matrix);
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};
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struct MarkRecord
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{
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friend struct MarkArray;
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inline bool sanitize (hb_sanitize_context_t *c, void *base) {
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TRACE_SANITIZE ();
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return TRACE_RETURN (c->check_struct (this) && markAnchor.sanitize (c, base));
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}
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protected:
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USHORT klass; /* Class defined for this mark */
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OffsetTo<Anchor>
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markAnchor; /* Offset to Anchor table--from
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* beginning of MarkArray table */
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public:
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DEFINE_SIZE_STATIC (4);
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};
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struct MarkArray : ArrayOf<MarkRecord> /* Array of MarkRecords--in Coverage order */
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{
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inline bool apply (hb_apply_context_t *c,
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unsigned int mark_index, unsigned int glyph_index,
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const AnchorMatrix &anchors, unsigned int class_count,
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unsigned int glyph_pos) const
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{
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TRACE_APPLY ();
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const MarkRecord &record = ArrayOf<MarkRecord>::operator[](mark_index);
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unsigned int mark_class = record.klass;
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const Anchor& mark_anchor = this + record.markAnchor;
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const Anchor& glyph_anchor = anchors.get_anchor (glyph_index, mark_class, class_count);
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hb_position_t mark_x, mark_y, base_x, base_y;
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mark_anchor.get_anchor (c->font, c->buffer->cur().codepoint, &mark_x, &mark_y);
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glyph_anchor.get_anchor (c->font, c->buffer->info[glyph_pos].codepoint, &base_x, &base_y);
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hb_glyph_position_t &o = c->buffer->cur_pos();
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o.x_offset = base_x - mark_x;
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o.y_offset = base_y - mark_y;
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o.attach_lookback() = c->buffer->idx - glyph_pos;
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c->buffer->idx++;
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return TRACE_RETURN (true);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return TRACE_RETURN (ArrayOf<MarkRecord>::sanitize (c, this));
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}
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};
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/* Lookups */
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struct SinglePosFormat1
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{
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friend struct SinglePos;
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private:
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inline const Coverage &get_coverage (void) const
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{
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return this+coverage;
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}
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inline bool apply (hb_apply_context_t *c) const
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{
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TRACE_APPLY ();
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unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
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if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
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valueFormat.apply_value (c->font, c->direction, this,
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values, c->buffer->cur_pos());
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c->buffer->idx++;
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return TRACE_RETURN (true);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_value (c, this, values));
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}
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protected:
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USHORT format; /* Format identifier--format = 1 */
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OffsetTo<Coverage>
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coverage; /* Offset to Coverage table--from
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* beginning of subtable */
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ValueFormat valueFormat; /* Defines the types of data in the
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* ValueRecord */
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ValueRecord values; /* Defines positioning
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* value(s)--applied to all glyphs in
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* the Coverage table */
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public:
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DEFINE_SIZE_ARRAY (6, values);
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};
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struct SinglePosFormat2
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{
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friend struct SinglePos;
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private:
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inline const Coverage &get_coverage (void) const
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{
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return this+coverage;
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}
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inline bool apply (hb_apply_context_t *c) const
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{
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TRACE_APPLY ();
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unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
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if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
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if (likely (index >= valueCount)) return TRACE_RETURN (false);
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valueFormat.apply_value (c->font, c->direction, this,
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|
&values[index * valueFormat.get_len ()],
|
|
c->buffer->cur_pos());
|
|
|
|
c->buffer->idx++;
|
|
return TRACE_RETURN (true);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_values (c, this, values, valueCount));
|
|
}
|
|
|
|
protected:
|
|
USHORT format; /* Format identifier--format = 2 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of subtable */
|
|
ValueFormat valueFormat; /* Defines the types of data in the
|
|
* ValueRecord */
|
|
USHORT valueCount; /* Number of ValueRecords */
|
|
ValueRecord values; /* Array of ValueRecords--positioning
|
|
* values applied to glyphs */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (8, values);
|
|
};
|
|
|
|
struct SinglePos
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_coverage ();
|
|
case 2: return u.format2.get_coverage ();
|
|
default:return Null(Coverage);
|
|
}
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.apply (c));
|
|
case 2: return TRACE_RETURN (u.format2.apply (c));
|
|
default:return TRACE_RETURN (false);
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.sanitize (c));
|
|
case 2: return TRACE_RETURN (u.format2.sanitize (c));
|
|
default:return TRACE_RETURN (true);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
SinglePosFormat1 format1;
|
|
SinglePosFormat2 format2;
|
|
} u;
|
|
};
|
|
|
|
|
|
struct PairValueRecord
|
|
{
|
|
friend struct PairSet;
|
|
|
|
protected:
|
|
GlyphID secondGlyph; /* GlyphID of second glyph in the
|
|
* pair--first glyph is listed in the
|
|
* Coverage table */
|
|
ValueRecord values; /* Positioning data for the first glyph
|
|
* followed by for second glyph */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (2, values);
|
|
};
|
|
|
|
struct PairSet
|
|
{
|
|
friend struct PairPosFormat1;
|
|
|
|
inline bool apply (hb_apply_context_t *c,
|
|
const ValueFormat *valueFormats,
|
|
unsigned int pos) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int len1 = valueFormats[0].get_len ();
|
|
unsigned int len2 = valueFormats[1].get_len ();
|
|
unsigned int record_size = USHORT::static_size * (1 + len1 + len2);
|
|
|
|
unsigned int count = len;
|
|
const PairValueRecord *record = CastP<PairValueRecord> (array);
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
if (c->buffer->info[pos].codepoint == record->secondGlyph)
|
|
{
|
|
valueFormats[0].apply_value (c->font, c->direction, this,
|
|
&record->values[0], c->buffer->cur_pos());
|
|
valueFormats[1].apply_value (c->font, c->direction, this,
|
|
&record->values[len1], c->buffer->pos[pos]);
|
|
if (len2)
|
|
pos++;
|
|
c->buffer->idx = pos;
|
|
return TRACE_RETURN (true);
|
|
}
|
|
record = &StructAtOffset<PairValueRecord> (record, record_size);
|
|
}
|
|
|
|
return TRACE_RETURN (false);
|
|
}
|
|
|
|
struct sanitize_closure_t {
|
|
void *base;
|
|
ValueFormat *valueFormats;
|
|
unsigned int len1; /* valueFormats[0].get_len() */
|
|
unsigned int stride; /* 1 + len1 + len2 */
|
|
};
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c, const sanitize_closure_t *closure) {
|
|
TRACE_SANITIZE ();
|
|
if (!(c->check_struct (this)
|
|
&& c->check_array (array, USHORT::static_size * closure->stride, len))) return TRACE_RETURN (false);
|
|
|
|
unsigned int count = len;
|
|
PairValueRecord *record = CastP<PairValueRecord> (array);
|
|
return TRACE_RETURN (closure->valueFormats[0].sanitize_values_stride_unsafe (c, closure->base, &record->values[0], count, closure->stride)
|
|
&& closure->valueFormats[1].sanitize_values_stride_unsafe (c, closure->base, &record->values[closure->len1], count, closure->stride));
|
|
}
|
|
|
|
protected:
|
|
USHORT len; /* Number of PairValueRecords */
|
|
USHORT array[VAR]; /* Array of PairValueRecords--ordered
|
|
* by GlyphID of the second glyph */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (2, array);
|
|
};
|
|
|
|
struct PairPosFormat1
|
|
{
|
|
friend struct PairPos;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
return this+coverage;
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx, 1);
|
|
if (skippy_iter.has_no_chance ()) return TRACE_RETURN (false);
|
|
|
|
unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
|
|
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
|
|
|
|
if (!skippy_iter.next ()) return TRACE_RETURN (false);
|
|
|
|
return TRACE_RETURN ((this+pairSet[index]).apply (c, &valueFormat1, skippy_iter.idx));
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
|
|
unsigned int len1 = valueFormat1.get_len ();
|
|
unsigned int len2 = valueFormat2.get_len ();
|
|
PairSet::sanitize_closure_t closure = {
|
|
this,
|
|
&valueFormat1,
|
|
len1,
|
|
1 + len1 + len2
|
|
};
|
|
|
|
return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && pairSet.sanitize (c, this, &closure));
|
|
}
|
|
|
|
protected:
|
|
USHORT format; /* Format identifier--format = 1 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of subtable */
|
|
ValueFormat valueFormat1; /* Defines the types of data in
|
|
* ValueRecord1--for the first glyph
|
|
* in the pair--may be zero (0) */
|
|
ValueFormat valueFormat2; /* Defines the types of data in
|
|
* ValueRecord2--for the second glyph
|
|
* in the pair--may be zero (0) */
|
|
OffsetArrayOf<PairSet>
|
|
pairSet; /* Array of PairSet tables
|
|
* ordered by Coverage Index */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (10, pairSet);
|
|
};
|
|
|
|
struct PairPosFormat2
|
|
{
|
|
friend struct PairPos;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
return this+coverage;
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx, 1);
|
|
if (skippy_iter.has_no_chance ()) return TRACE_RETURN (false);
|
|
|
|
unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
|
|
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
|
|
|
|
if (!skippy_iter.next ()) return TRACE_RETURN (false);
|
|
|
|
unsigned int len1 = valueFormat1.get_len ();
|
|
unsigned int len2 = valueFormat2.get_len ();
|
|
unsigned int record_len = len1 + len2;
|
|
|
|
unsigned int klass1 = (this+classDef1) (c->buffer->cur().codepoint);
|
|
unsigned int klass2 = (this+classDef2) (c->buffer->info[skippy_iter.idx].codepoint);
|
|
if (unlikely (klass1 >= class1Count || klass2 >= class2Count)) return TRACE_RETURN (false);
|
|
|
|
const Value *v = &values[record_len * (klass1 * class2Count + klass2)];
|
|
valueFormat1.apply_value (c->font, c->direction, this,
|
|
v, c->buffer->cur_pos());
|
|
valueFormat2.apply_value (c->font, c->direction, this,
|
|
v + len1, c->buffer->pos[skippy_iter.idx]);
|
|
|
|
c->buffer->idx = skippy_iter.idx;
|
|
if (len2)
|
|
c->buffer->idx++;
|
|
|
|
return TRACE_RETURN (true);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!(c->check_struct (this)
|
|
&& coverage.sanitize (c, this)
|
|
&& classDef1.sanitize (c, this)
|
|
&& classDef2.sanitize (c, this))) return TRACE_RETURN (false);
|
|
|
|
unsigned int len1 = valueFormat1.get_len ();
|
|
unsigned int len2 = valueFormat2.get_len ();
|
|
unsigned int stride = len1 + len2;
|
|
unsigned int record_size = valueFormat1.get_size () + valueFormat2.get_size ();
|
|
unsigned int count = (unsigned int) class1Count * (unsigned int) class2Count;
|
|
return TRACE_RETURN (c->check_array (values, record_size, count) &&
|
|
valueFormat1.sanitize_values_stride_unsafe (c, this, &values[0], count, stride) &&
|
|
valueFormat2.sanitize_values_stride_unsafe (c, this, &values[len1], count, stride));
|
|
}
|
|
|
|
protected:
|
|
USHORT format; /* Format identifier--format = 2 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of subtable */
|
|
ValueFormat valueFormat1; /* ValueRecord definition--for the
|
|
* first glyph of the pair--may be zero
|
|
* (0) */
|
|
ValueFormat valueFormat2; /* ValueRecord definition--for the
|
|
* second glyph of the pair--may be
|
|
* zero (0) */
|
|
OffsetTo<ClassDef>
|
|
classDef1; /* Offset to ClassDef table--from
|
|
* beginning of PairPos subtable--for
|
|
* the first glyph of the pair */
|
|
OffsetTo<ClassDef>
|
|
classDef2; /* Offset to ClassDef table--from
|
|
* beginning of PairPos subtable--for
|
|
* the second glyph of the pair */
|
|
USHORT class1Count; /* Number of classes in ClassDef1
|
|
* table--includes Class0 */
|
|
USHORT class2Count; /* Number of classes in ClassDef2
|
|
* table--includes Class0 */
|
|
ValueRecord values; /* Matrix of value pairs:
|
|
* class1-major, class2-minor,
|
|
* Each entry has value1 and value2 */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (16, values);
|
|
};
|
|
|
|
struct PairPos
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_coverage ();
|
|
case 2: return u.format2.get_coverage ();
|
|
default:return Null(Coverage);
|
|
}
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.apply (c));
|
|
case 2: return TRACE_RETURN (u.format2.apply (c));
|
|
default:return TRACE_RETURN (false);
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.sanitize (c));
|
|
case 2: return TRACE_RETURN (u.format2.sanitize (c));
|
|
default:return TRACE_RETURN (true);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
PairPosFormat1 format1;
|
|
PairPosFormat2 format2;
|
|
} u;
|
|
};
|
|
|
|
|
|
struct EntryExitRecord
|
|
{
|
|
friend struct CursivePosFormat1;
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c, void *base) {
|
|
TRACE_SANITIZE ();
|
|
return TRACE_RETURN (entryAnchor.sanitize (c, base) && exitAnchor.sanitize (c, base));
|
|
}
|
|
|
|
protected:
|
|
OffsetTo<Anchor>
|
|
entryAnchor; /* Offset to EntryAnchor table--from
|
|
* beginning of CursivePos
|
|
* subtable--may be NULL */
|
|
OffsetTo<Anchor>
|
|
exitAnchor; /* Offset to ExitAnchor table--from
|
|
* beginning of CursivePos
|
|
* subtable--may be NULL */
|
|
public:
|
|
DEFINE_SIZE_STATIC (4);
|
|
};
|
|
|
|
struct CursivePosFormat1
|
|
{
|
|
friend struct CursivePos;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
return this+coverage;
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
|
|
/* We don't handle mark glyphs here. */
|
|
if (c->property & HB_OT_LAYOUT_GLYPH_CLASS_MARK) return TRACE_RETURN (false);
|
|
|
|
hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx, 1);
|
|
if (skippy_iter.has_no_chance ()) return TRACE_RETURN (false);
|
|
|
|
const EntryExitRecord &this_record = entryExitRecord[(this+coverage) (c->buffer->cur().codepoint)];
|
|
if (!this_record.exitAnchor) return TRACE_RETURN (false);
|
|
|
|
if (!skippy_iter.next ()) return TRACE_RETURN (false);
|
|
|
|
const EntryExitRecord &next_record = entryExitRecord[(this+coverage) (c->buffer->info[skippy_iter.idx].codepoint)];
|
|
if (!next_record.entryAnchor) return TRACE_RETURN (false);
|
|
|
|
unsigned int i = c->buffer->idx;
|
|
unsigned int j = skippy_iter.idx;
|
|
|
|
hb_position_t entry_x, entry_y, exit_x, exit_y;
|
|
(this+this_record.exitAnchor).get_anchor (c->font, c->buffer->info[i].codepoint, &exit_x, &exit_y);
|
|
(this+next_record.entryAnchor).get_anchor (c->font, c->buffer->info[j].codepoint, &entry_x, &entry_y);
|
|
|
|
hb_glyph_position_t *pos = c->buffer->pos;
|
|
|
|
hb_position_t d;
|
|
/* Main-direction adjustment */
|
|
switch (c->direction) {
|
|
case HB_DIRECTION_LTR:
|
|
pos[i].x_advance = exit_x + pos[i].x_offset;
|
|
|
|
d = entry_x + pos[j].x_offset;
|
|
pos[j].x_advance -= d;
|
|
pos[j].x_offset -= d;
|
|
break;
|
|
case HB_DIRECTION_RTL:
|
|
d = exit_x + pos[i].x_offset;
|
|
pos[i].x_advance -= d;
|
|
pos[i].x_offset -= d;
|
|
|
|
pos[j].x_advance = entry_x + pos[j].x_offset;
|
|
break;
|
|
case HB_DIRECTION_TTB:
|
|
pos[i].y_advance = exit_y + pos[i].y_offset;
|
|
|
|
d = entry_y + pos[j].y_offset;
|
|
pos[j].y_advance -= d;
|
|
pos[j].y_offset -= d;
|
|
break;
|
|
case HB_DIRECTION_BTT:
|
|
d = exit_y + pos[i].y_offset;
|
|
pos[i].y_advance -= d;
|
|
pos[i].y_offset -= d;
|
|
|
|
pos[j].y_advance = entry_y;
|
|
break;
|
|
case HB_DIRECTION_INVALID:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Cross-direction adjustment */
|
|
if (c->lookup_props & LookupFlag::RightToLeft) {
|
|
pos[i].cursive_chain() = j - i;
|
|
if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
|
|
pos[i].y_offset = entry_y - exit_y;
|
|
else
|
|
pos[i].x_offset = entry_x - exit_x;
|
|
} else {
|
|
pos[j].cursive_chain() = i - j;
|
|
if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
|
|
pos[j].y_offset = exit_y - entry_y;
|
|
else
|
|
pos[j].x_offset = exit_x - entry_x;
|
|
}
|
|
|
|
c->buffer->idx = j;
|
|
return TRACE_RETURN (true);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return TRACE_RETURN (coverage.sanitize (c, this) && entryExitRecord.sanitize (c, this));
|
|
}
|
|
|
|
protected:
|
|
USHORT format; /* Format identifier--format = 1 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of subtable */
|
|
ArrayOf<EntryExitRecord>
|
|
entryExitRecord; /* Array of EntryExit records--in
|
|
* Coverage Index order */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (6, entryExitRecord);
|
|
};
|
|
|
|
struct CursivePos
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_coverage ();
|
|
default:return Null(Coverage);
|
|
}
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.apply (c));
|
|
default:return TRACE_RETURN (false);
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.sanitize (c));
|
|
default:return TRACE_RETURN (true);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
CursivePosFormat1 format1;
|
|
} u;
|
|
};
|
|
|
|
|
|
typedef AnchorMatrix BaseArray; /* base-major--
|
|
* in order of BaseCoverage Index--,
|
|
* mark-minor--
|
|
* ordered by class--zero-based. */
|
|
|
|
struct MarkBasePosFormat1
|
|
{
|
|
friend struct MarkBasePos;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
return this+markCoverage;
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int mark_index = (this+markCoverage) (c->buffer->cur().codepoint);
|
|
if (likely (mark_index == NOT_COVERED)) return TRACE_RETURN (false);
|
|
|
|
/* now we search backwards for a non-mark glyph */
|
|
unsigned int property;
|
|
hb_apply_context_t::mark_skipping_backward_iterator_t skippy_iter (c, c->buffer->idx, 1);
|
|
do {
|
|
if (!skippy_iter.prev (&property, LookupFlag::IgnoreMarks)) return TRACE_RETURN (false);
|
|
/* We only want to attach to the first of a MultipleSubst sequence. Reject others. */
|
|
if (0 == get_lig_comp (c->buffer->info[skippy_iter.idx])) break;
|
|
skippy_iter.reject ();
|
|
} while (1);
|
|
|
|
/* The following assertion is too strong, so we've disabled it. */
|
|
if (!(property & HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH)) {/*return TRACE_RETURN (false);*/}
|
|
|
|
unsigned int base_index = (this+baseCoverage) (c->buffer->info[skippy_iter.idx].codepoint);
|
|
if (base_index == NOT_COVERED) return TRACE_RETURN (false);
|
|
|
|
return TRACE_RETURN ((this+markArray).apply (c, mark_index, base_index, this+baseArray, classCount, skippy_iter.idx));
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return TRACE_RETURN (c->check_struct (this) && markCoverage.sanitize (c, this) && baseCoverage.sanitize (c, this) &&
|
|
markArray.sanitize (c, this) && baseArray.sanitize (c, this, (unsigned int) classCount));
|
|
}
|
|
|
|
protected:
|
|
USHORT format; /* Format identifier--format = 1 */
|
|
OffsetTo<Coverage>
|
|
markCoverage; /* Offset to MarkCoverage table--from
|
|
* beginning of MarkBasePos subtable */
|
|
OffsetTo<Coverage>
|
|
baseCoverage; /* Offset to BaseCoverage table--from
|
|
* beginning of MarkBasePos subtable */
|
|
USHORT classCount; /* Number of classes defined for marks */
|
|
OffsetTo<MarkArray>
|
|
markArray; /* Offset to MarkArray table--from
|
|
* beginning of MarkBasePos subtable */
|
|
OffsetTo<BaseArray>
|
|
baseArray; /* Offset to BaseArray table--from
|
|
* beginning of MarkBasePos subtable */
|
|
public:
|
|
DEFINE_SIZE_STATIC (12);
|
|
};
|
|
|
|
struct MarkBasePos
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_coverage ();
|
|
default:return Null(Coverage);
|
|
}
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.apply (c));
|
|
default:return TRACE_RETURN (false);
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.sanitize (c));
|
|
default:return TRACE_RETURN (true);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
MarkBasePosFormat1 format1;
|
|
} u;
|
|
};
|
|
|
|
|
|
typedef AnchorMatrix LigatureAttach; /* component-major--
|
|
* in order of writing direction--,
|
|
* mark-minor--
|
|
* ordered by class--zero-based. */
|
|
|
|
typedef OffsetListOf<LigatureAttach> LigatureArray;
|
|
/* Array of LigatureAttach
|
|
* tables ordered by
|
|
* LigatureCoverage Index */
|
|
|
|
struct MarkLigPosFormat1
|
|
{
|
|
friend struct MarkLigPos;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
return this+markCoverage;
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int mark_index = (this+markCoverage) (c->buffer->cur().codepoint);
|
|
if (likely (mark_index == NOT_COVERED)) return TRACE_RETURN (false);
|
|
|
|
/* now we search backwards for a non-mark glyph */
|
|
unsigned int property;
|
|
hb_apply_context_t::mark_skipping_backward_iterator_t skippy_iter (c, c->buffer->idx, 1);
|
|
if (!skippy_iter.prev (&property, LookupFlag::IgnoreMarks)) return TRACE_RETURN (false);
|
|
|
|
/* The following assertion is too strong, so we've disabled it. */
|
|
if (!(property & HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE)) {/*return TRACE_RETURN (false);*/}
|
|
|
|
unsigned int j = skippy_iter.idx;
|
|
unsigned int lig_index = (this+ligatureCoverage) (c->buffer->info[j].codepoint);
|
|
if (lig_index == NOT_COVERED) return TRACE_RETURN (false);
|
|
|
|
const LigatureArray& lig_array = this+ligatureArray;
|
|
const LigatureAttach& lig_attach = lig_array[lig_index];
|
|
|
|
/* Find component to attach to */
|
|
unsigned int comp_count = lig_attach.rows;
|
|
if (unlikely (!comp_count)) return TRACE_RETURN (false);
|
|
|
|
/* We must now check whether the ligature ID of the current mark glyph
|
|
* is identical to the ligature ID of the found ligature. If yes, we
|
|
* can directly use the component index. If not, we attach the mark
|
|
* glyph to the last component of the ligature. */
|
|
unsigned int comp_index;
|
|
unsigned int lig_id = get_lig_id (c->buffer->info[j]);
|
|
unsigned int mark_id = get_lig_id (c->buffer->cur());
|
|
unsigned int mark_comp = get_lig_comp (c->buffer->cur());
|
|
if (lig_id && lig_id == mark_id && mark_comp > 0)
|
|
comp_index = MIN (comp_count, get_lig_comp (c->buffer->cur())) - 1;
|
|
else
|
|
comp_index = comp_count - 1;
|
|
|
|
return TRACE_RETURN ((this+markArray).apply (c, mark_index, comp_index, lig_attach, classCount, j));
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return TRACE_RETURN (c->check_struct (this) && markCoverage.sanitize (c, this) && ligatureCoverage.sanitize (c, this) &&
|
|
markArray.sanitize (c, this) && ligatureArray.sanitize (c, this, (unsigned int) classCount));
|
|
}
|
|
|
|
protected:
|
|
USHORT format; /* Format identifier--format = 1 */
|
|
OffsetTo<Coverage>
|
|
markCoverage; /* Offset to Mark Coverage table--from
|
|
* beginning of MarkLigPos subtable */
|
|
OffsetTo<Coverage>
|
|
ligatureCoverage; /* Offset to Ligature Coverage
|
|
* table--from beginning of MarkLigPos
|
|
* subtable */
|
|
USHORT classCount; /* Number of defined mark classes */
|
|
OffsetTo<MarkArray>
|
|
markArray; /* Offset to MarkArray table--from
|
|
* beginning of MarkLigPos subtable */
|
|
OffsetTo<LigatureArray>
|
|
ligatureArray; /* Offset to LigatureArray table--from
|
|
* beginning of MarkLigPos subtable */
|
|
public:
|
|
DEFINE_SIZE_STATIC (12);
|
|
};
|
|
|
|
struct MarkLigPos
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_coverage ();
|
|
default:return Null(Coverage);
|
|
}
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.apply (c));
|
|
default:return TRACE_RETURN (false);
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.sanitize (c));
|
|
default:return TRACE_RETURN (true);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
MarkLigPosFormat1 format1;
|
|
} u;
|
|
};
|
|
|
|
|
|
typedef AnchorMatrix Mark2Array; /* mark2-major--
|
|
* in order of Mark2Coverage Index--,
|
|
* mark1-minor--
|
|
* ordered by class--zero-based. */
|
|
|
|
struct MarkMarkPosFormat1
|
|
{
|
|
friend struct MarkMarkPos;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
return this+mark1Coverage;
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int mark1_index = (this+mark1Coverage) (c->buffer->cur().codepoint);
|
|
if (likely (mark1_index == NOT_COVERED)) return TRACE_RETURN (false);
|
|
|
|
/* now we search backwards for a suitable mark glyph until a non-mark glyph */
|
|
unsigned int property;
|
|
hb_apply_context_t::mark_skipping_backward_iterator_t skippy_iter (c, c->buffer->idx, 1);
|
|
if (!skippy_iter.prev (&property)) return TRACE_RETURN (false);
|
|
|
|
if (!(property & HB_OT_LAYOUT_GLYPH_CLASS_MARK)) return TRACE_RETURN (false);
|
|
|
|
unsigned int j = skippy_iter.idx;
|
|
|
|
unsigned int id1 = get_lig_id (c->buffer->cur());
|
|
unsigned int id2 = get_lig_id (c->buffer->info[j]);
|
|
unsigned int comp1 = get_lig_comp (c->buffer->cur());
|
|
unsigned int comp2 = get_lig_comp (c->buffer->info[j]);
|
|
|
|
if (likely (id1 == id2)) {
|
|
if (id1 == 0) /* Marks belonging to the same base. */
|
|
goto good;
|
|
else if (comp1 == comp2) /* Marks belonging to the same ligature component. */
|
|
goto good;
|
|
} else {
|
|
/* If ligature ids don't match, it may be the case that one of the marks
|
|
* itself is a ligature. In which case match. */
|
|
if ((id1 > 0 && !comp1) || (id2 > 0 && !comp2))
|
|
goto good;
|
|
}
|
|
|
|
/* Didn't match. */
|
|
return TRACE_RETURN (false);
|
|
|
|
good:
|
|
unsigned int mark2_index = (this+mark2Coverage) (c->buffer->info[j].codepoint);
|
|
if (mark2_index == NOT_COVERED) return TRACE_RETURN (false);
|
|
|
|
return TRACE_RETURN ((this+mark1Array).apply (c, mark1_index, mark2_index, this+mark2Array, classCount, j));
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return TRACE_RETURN (c->check_struct (this) && mark1Coverage.sanitize (c, this) &&
|
|
mark2Coverage.sanitize (c, this) && mark1Array.sanitize (c, this)
|
|
&& mark2Array.sanitize (c, this, (unsigned int) classCount));
|
|
}
|
|
|
|
protected:
|
|
USHORT format; /* Format identifier--format = 1 */
|
|
OffsetTo<Coverage>
|
|
mark1Coverage; /* Offset to Combining Mark1 Coverage
|
|
* table--from beginning of MarkMarkPos
|
|
* subtable */
|
|
OffsetTo<Coverage>
|
|
mark2Coverage; /* Offset to Combining Mark2 Coverage
|
|
* table--from beginning of MarkMarkPos
|
|
* subtable */
|
|
USHORT classCount; /* Number of defined mark classes */
|
|
OffsetTo<MarkArray>
|
|
mark1Array; /* Offset to Mark1Array table--from
|
|
* beginning of MarkMarkPos subtable */
|
|
OffsetTo<Mark2Array>
|
|
mark2Array; /* Offset to Mark2Array table--from
|
|
* beginning of MarkMarkPos subtable */
|
|
public:
|
|
DEFINE_SIZE_STATIC (12);
|
|
};
|
|
|
|
struct MarkMarkPos
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_coverage ();
|
|
default:return Null(Coverage);
|
|
}
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.apply (c));
|
|
default:return TRACE_RETURN (false);
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
|
|
switch (u.format) {
|
|
case 1: return TRACE_RETURN (u.format1.sanitize (c));
|
|
default:return TRACE_RETURN (true);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
MarkMarkPosFormat1 format1;
|
|
} u;
|
|
};
|
|
|
|
|
|
static inline bool position_lookup (hb_apply_context_t *c, unsigned int lookup_index);
|
|
|
|
struct ContextPos : Context
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
return TRACE_RETURN (Context::apply (c, position_lookup));
|
|
}
|
|
};
|
|
|
|
struct ChainContextPos : ChainContext
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
return TRACE_RETURN (ChainContext::apply (c, position_lookup));
|
|
}
|
|
};
|
|
|
|
|
|
struct ExtensionPos : Extension
|
|
{
|
|
friend struct PosLookupSubTable;
|
|
|
|
private:
|
|
inline const struct PosLookupSubTable& get_subtable (void) const
|
|
{
|
|
unsigned int offset = get_offset ();
|
|
if (unlikely (!offset)) return Null(PosLookupSubTable);
|
|
return StructAtOffset<PosLookupSubTable> (this, offset);
|
|
}
|
|
|
|
inline const Coverage &get_coverage (void) const;
|
|
|
|
inline bool apply (hb_apply_context_t *c) const;
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c);
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
* PosLookup
|
|
*/
|
|
|
|
|
|
struct PosLookupSubTable
|
|
{
|
|
friend struct PosLookup;
|
|
|
|
enum Type {
|
|
Single = 1,
|
|
Pair = 2,
|
|
Cursive = 3,
|
|
MarkBase = 4,
|
|
MarkLig = 5,
|
|
MarkMark = 6,
|
|
Context = 7,
|
|
ChainContext = 8,
|
|
Extension = 9
|
|
};
|
|
|
|
inline const Coverage &get_coverage (unsigned int lookup_type) const
|
|
{
|
|
switch (lookup_type) {
|
|
case Single: return u.single.get_coverage ();
|
|
case Pair: return u.pair.get_coverage ();
|
|
case Cursive: return u.cursive.get_coverage ();
|
|
case MarkBase: return u.markBase.get_coverage ();
|
|
case MarkLig: return u.markLig.get_coverage ();
|
|
case MarkMark: return u.markMark.get_coverage ();
|
|
case Context: return u.context.get_coverage ();
|
|
case ChainContext: return u.chainContext.get_coverage ();
|
|
case Extension: return u.extension.get_coverage ();
|
|
default: return Null(Coverage);
|
|
}
|
|
}
|
|
|
|
inline bool apply (hb_apply_context_t *c, unsigned int lookup_type) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (lookup_type) {
|
|
case Single: return TRACE_RETURN (u.single.apply (c));
|
|
case Pair: return TRACE_RETURN (u.pair.apply (c));
|
|
case Cursive: return TRACE_RETURN (u.cursive.apply (c));
|
|
case MarkBase: return TRACE_RETURN (u.markBase.apply (c));
|
|
case MarkLig: return TRACE_RETURN (u.markLig.apply (c));
|
|
case MarkMark: return TRACE_RETURN (u.markMark.apply (c));
|
|
case Context: return TRACE_RETURN (u.context.apply (c));
|
|
case ChainContext: return TRACE_RETURN (u.chainContext.apply (c));
|
|
case Extension: return TRACE_RETURN (u.extension.apply (c));
|
|
default: return TRACE_RETURN (false);
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c, unsigned int lookup_type) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.header.sub_format.sanitize (c))
|
|
return TRACE_RETURN (false);
|
|
switch (lookup_type) {
|
|
case Single: return TRACE_RETURN (u.single.sanitize (c));
|
|
case Pair: return TRACE_RETURN (u.pair.sanitize (c));
|
|
case Cursive: return TRACE_RETURN (u.cursive.sanitize (c));
|
|
case MarkBase: return TRACE_RETURN (u.markBase.sanitize (c));
|
|
case MarkLig: return TRACE_RETURN (u.markLig.sanitize (c));
|
|
case MarkMark: return TRACE_RETURN (u.markMark.sanitize (c));
|
|
case Context: return TRACE_RETURN (u.context.sanitize (c));
|
|
case ChainContext: return TRACE_RETURN (u.chainContext.sanitize (c));
|
|
case Extension: return TRACE_RETURN (u.extension.sanitize (c));
|
|
default: return TRACE_RETURN (true);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
union {
|
|
struct {
|
|
USHORT sub_format;
|
|
} header;
|
|
SinglePos single;
|
|
PairPos pair;
|
|
CursivePos cursive;
|
|
MarkBasePos markBase;
|
|
MarkLigPos markLig;
|
|
MarkMarkPos markMark;
|
|
ContextPos context;
|
|
ChainContextPos chainContext;
|
|
ExtensionPos extension;
|
|
} u;
|
|
public:
|
|
DEFINE_SIZE_UNION (2, header.sub_format);
|
|
};
|
|
|
|
|
|
struct PosLookup : Lookup
|
|
{
|
|
inline const PosLookupSubTable& get_subtable (unsigned int i) const
|
|
{ return this+CastR<OffsetArrayOf<PosLookupSubTable> > (subTable)[i]; }
|
|
|
|
template <typename set_t>
|
|
inline void add_coverage (set_t *glyphs) const
|
|
{
|
|
const Coverage *last = NULL;
|
|
unsigned int count = get_subtable_count ();
|
|
for (unsigned int i = 0; i < count; i++) {
|
|
const Coverage *c = &get_subtable (i).get_coverage (get_type ());
|
|
if (c != last) {
|
|
c->add_coverage (glyphs);
|
|
last = c;
|
|
}
|
|
}
|
|
}
|
|
|
|
inline bool apply_once (hb_apply_context_t *c) const
|
|
{
|
|
unsigned int lookup_type = get_type ();
|
|
|
|
if (!c->check_glyph_property (&c->buffer->cur(), c->lookup_props, &c->property))
|
|
return false;
|
|
|
|
unsigned int count = get_subtable_count ();
|
|
for (unsigned int i = 0; i < count; i++)
|
|
if (get_subtable (i).apply (c, lookup_type))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
inline bool apply_string (hb_apply_context_t *c, const hb_set_digest_t *digest) const
|
|
{
|
|
bool ret = false;
|
|
|
|
if (unlikely (!c->buffer->len))
|
|
return false;
|
|
|
|
c->set_lookup (*this);
|
|
|
|
c->buffer->idx = 0;
|
|
|
|
while (c->buffer->idx < c->buffer->len)
|
|
{
|
|
if ((c->buffer->cur().mask & c->lookup_mask) &&
|
|
digest->may_have (c->buffer->cur().codepoint) &&
|
|
apply_once (c))
|
|
ret = true;
|
|
else
|
|
c->buffer->idx++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (unlikely (!Lookup::sanitize (c))) return TRACE_RETURN (false);
|
|
OffsetArrayOf<PosLookupSubTable> &list = CastR<OffsetArrayOf<PosLookupSubTable> > (subTable);
|
|
return TRACE_RETURN (list.sanitize (c, this, get_type ()));
|
|
}
|
|
};
|
|
|
|
typedef OffsetListOf<PosLookup> PosLookupList;
|
|
|
|
/*
|
|
* GPOS -- The Glyph Positioning Table
|
|
*/
|
|
|
|
struct GPOS : GSUBGPOS
|
|
{
|
|
static const hb_tag_t Tag = HB_OT_TAG_GPOS;
|
|
|
|
inline const PosLookup& get_lookup (unsigned int i) const
|
|
{ return CastR<PosLookup> (GSUBGPOS::get_lookup (i)); }
|
|
|
|
template <typename set_t>
|
|
inline void add_coverage (set_t *glyphs, unsigned int lookup_index) const
|
|
{ get_lookup (lookup_index).add_coverage (glyphs); }
|
|
|
|
static inline void position_start (hb_font_t *font, hb_buffer_t *buffer);
|
|
static inline void position_finish (hb_font_t *font, hb_buffer_t *buffer, hb_bool_t zero_width_attahced_marks);
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (unlikely (!GSUBGPOS::sanitize (c))) return TRACE_RETURN (false);
|
|
OffsetTo<PosLookupList> &list = CastR<OffsetTo<PosLookupList> > (lookupList);
|
|
return TRACE_RETURN (list.sanitize (c, this));
|
|
}
|
|
public:
|
|
DEFINE_SIZE_STATIC (10);
|
|
};
|
|
|
|
|
|
static void
|
|
fix_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
|
|
{
|
|
unsigned int j = pos[i].cursive_chain();
|
|
if (likely (!j))
|
|
return;
|
|
|
|
j += i;
|
|
|
|
pos[i].cursive_chain() = 0;
|
|
|
|
fix_cursive_minor_offset (pos, j, direction);
|
|
|
|
if (HB_DIRECTION_IS_HORIZONTAL (direction))
|
|
pos[i].y_offset += pos[j].y_offset;
|
|
else
|
|
pos[i].x_offset += pos[j].x_offset;
|
|
}
|
|
|
|
static void
|
|
fix_mark_attachment (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction, hb_bool_t zero_width_attached_marks)
|
|
{
|
|
if (likely (!(pos[i].attach_lookback())))
|
|
return;
|
|
|
|
unsigned int j = i - pos[i].attach_lookback();
|
|
|
|
if (zero_width_attached_marks) {
|
|
pos[i].x_advance = 0;
|
|
pos[i].y_advance = 0;
|
|
}
|
|
pos[i].x_offset += pos[j].x_offset;
|
|
pos[i].y_offset += pos[j].y_offset;
|
|
|
|
if (HB_DIRECTION_IS_FORWARD (direction))
|
|
for (unsigned int k = j; k < i; k++) {
|
|
pos[i].x_offset -= pos[k].x_advance;
|
|
pos[i].y_offset -= pos[k].y_advance;
|
|
}
|
|
else
|
|
for (unsigned int k = j + 1; k < i + 1; k++) {
|
|
pos[i].x_offset += pos[k].x_advance;
|
|
pos[i].y_offset += pos[k].y_advance;
|
|
}
|
|
}
|
|
|
|
void
|
|
GPOS::position_start (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
|
|
{
|
|
buffer->clear_positions ();
|
|
|
|
unsigned int count = buffer->len;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
buffer->pos[i].attach_lookback() = buffer->pos[i].cursive_chain() = 0;
|
|
}
|
|
|
|
void
|
|
GPOS::position_finish (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer, hb_bool_t zero_width_attached_marks)
|
|
{
|
|
unsigned int len;
|
|
hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, &len);
|
|
hb_direction_t direction = buffer->props.direction;
|
|
|
|
/* Handle cursive connections */
|
|
for (unsigned int i = 0; i < len; i++)
|
|
fix_cursive_minor_offset (pos, i, direction);
|
|
|
|
/* Handle attachments */
|
|
for (unsigned int i = 0; i < len; i++)
|
|
fix_mark_attachment (pos, i, direction, zero_width_attached_marks);
|
|
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, syllable);
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, lig_props);
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_props);
|
|
}
|
|
|
|
|
|
/* Out-of-class implementation for methods recursing */
|
|
|
|
inline const Coverage & ExtensionPos::get_coverage (void) const
|
|
{
|
|
return get_subtable ().get_coverage (get_type ());
|
|
}
|
|
|
|
inline bool ExtensionPos::apply (hb_apply_context_t *c) const
|
|
{
|
|
TRACE_APPLY ();
|
|
return TRACE_RETURN (get_subtable ().apply (c, get_type ()));
|
|
}
|
|
|
|
inline bool ExtensionPos::sanitize (hb_sanitize_context_t *c)
|
|
{
|
|
TRACE_SANITIZE ();
|
|
if (unlikely (!Extension::sanitize (c))) return TRACE_RETURN (false);
|
|
unsigned int offset = get_offset ();
|
|
if (unlikely (!offset)) return TRACE_RETURN (true);
|
|
return TRACE_RETURN (StructAtOffset<PosLookupSubTable> (this, offset).sanitize (c, get_type ()));
|
|
}
|
|
|
|
static inline bool position_lookup (hb_apply_context_t *c, unsigned int lookup_index)
|
|
{
|
|
const GPOS &gpos = *(hb_ot_layout_from_face (c->face)->gpos);
|
|
const PosLookup &l = gpos.get_lookup (lookup_index);
|
|
|
|
if (unlikely (c->nesting_level_left == 0))
|
|
return false;
|
|
|
|
hb_apply_context_t new_c (*c);
|
|
new_c.nesting_level_left--;
|
|
new_c.set_lookup (l);
|
|
return l.apply_once (&new_c);
|
|
}
|
|
|
|
|
|
#undef attach_lookback
|
|
#undef cursive_chain
|
|
|
|
|
|
} // namespace OT
|
|
|
|
|
|
#endif /* HB_OT_LAYOUT_GPOS_TABLE_HH */
|