982 lines
29 KiB
C++
982 lines
29 KiB
C++
/*
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* Copyright © 2016 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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* Google Author(s): Seigo Nonaka, Calder Kitagawa
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*/
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#ifndef HB_OT_COLOR_CBDT_TABLE_HH
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#define HB_OT_COLOR_CBDT_TABLE_HH
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#include "hb-open-type.hh"
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/*
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* CBLC -- Color Bitmap Location
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* https://docs.microsoft.com/en-us/typography/opentype/spec/cblc
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* https://docs.microsoft.com/en-us/typography/opentype/spec/eblc
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* CBDT -- Color Bitmap Data
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* https://docs.microsoft.com/en-us/typography/opentype/spec/cbdt
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* https://docs.microsoft.com/en-us/typography/opentype/spec/ebdt
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*/
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#define HB_OT_TAG_CBLC HB_TAG('C','B','L','C')
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#define HB_OT_TAG_CBDT HB_TAG('C','B','D','T')
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namespace OT {
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struct cblc_bitmap_size_subset_context_t
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{
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const char *cbdt;
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unsigned int cbdt_length;
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hb_vector_t<char> *cbdt_prime;
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unsigned int size; /* INOUT
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* Input: old size of IndexSubtable
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* Output: new size of IndexSubtable
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*/
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unsigned int num_tables; /* INOUT
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* Input: old number of subtables.
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* Output: new number of subtables.
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*/
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hb_codepoint_t start_glyph; /* OUT */
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hb_codepoint_t end_glyph; /* OUT */
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};
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static inline bool
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_copy_data_to_cbdt (hb_vector_t<char> *cbdt_prime,
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const void *data,
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unsigned length)
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{
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unsigned int new_len = cbdt_prime->length + length;
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if (unlikely (!cbdt_prime->alloc (new_len))) return false;
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memcpy (cbdt_prime->arrayZ + cbdt_prime->length, data, length);
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cbdt_prime->length = new_len;
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return true;
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}
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struct SmallGlyphMetrics
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{
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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void get_extents (hb_font_t *font, hb_glyph_extents_t *extents) const
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{
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extents->x_bearing = font->em_scale_x (bearingX);
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extents->y_bearing = font->em_scale_y (bearingY);
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extents->width = font->em_scale_x (width);
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extents->height = font->em_scale_y (-static_cast<int>(height));
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}
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HBUINT8 height;
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HBUINT8 width;
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HBINT8 bearingX;
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HBINT8 bearingY;
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HBUINT8 advance;
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public:
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DEFINE_SIZE_STATIC (5);
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};
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struct BigGlyphMetrics : SmallGlyphMetrics
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{
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HBINT8 vertBearingX;
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HBINT8 vertBearingY;
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HBUINT8 vertAdvance;
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public:
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DEFINE_SIZE_STATIC (8);
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};
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struct SBitLineMetrics
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{
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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HBINT8 ascender;
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HBINT8 decender;
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HBUINT8 widthMax;
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HBINT8 caretSlopeNumerator;
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HBINT8 caretSlopeDenominator;
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HBINT8 caretOffset;
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HBINT8 minOriginSB;
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HBINT8 minAdvanceSB;
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HBINT8 maxBeforeBL;
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HBINT8 minAfterBL;
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HBINT8 padding1;
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HBINT8 padding2;
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public:
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DEFINE_SIZE_STATIC (12);
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};
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/*
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* Index Subtables.
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*/
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struct IndexSubtableHeader
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{
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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HBUINT16 indexFormat;
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HBUINT16 imageFormat;
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HBUINT32 imageDataOffset;
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public:
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DEFINE_SIZE_STATIC (8);
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};
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template <typename OffsetType>
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struct IndexSubtableFormat1Or3
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{
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bool sanitize (hb_sanitize_context_t *c, unsigned int glyph_count) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this) &&
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offsetArrayZ.sanitize (c, glyph_count + 1));
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}
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bool get_image_data (unsigned int idx,
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unsigned int *offset,
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unsigned int *length) const
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{
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if (unlikely (offsetArrayZ[idx + 1] <= offsetArrayZ[idx]))
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return false;
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*offset = header.imageDataOffset + offsetArrayZ[idx];
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*length = offsetArrayZ[idx + 1] - offsetArrayZ[idx];
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return true;
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}
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bool add_offset (hb_serialize_context_t *c,
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unsigned int offset,
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unsigned int *size /* OUT (accumulated) */)
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{
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TRACE_SERIALIZE (this);
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Offset<OffsetType> embedded_offset;
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embedded_offset = offset;
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*size += sizeof (OffsetType);
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auto *o = c->embed (embedded_offset);
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return_trace ((bool) o);
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}
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IndexSubtableHeader header;
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UnsizedArrayOf<Offset<OffsetType>>
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offsetArrayZ;
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public:
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DEFINE_SIZE_ARRAY (8, offsetArrayZ);
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};
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struct IndexSubtableFormat1 : IndexSubtableFormat1Or3<HBUINT32> {};
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struct IndexSubtableFormat3 : IndexSubtableFormat1Or3<HBUINT16> {};
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struct IndexSubtable
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{
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bool sanitize (hb_sanitize_context_t *c, unsigned int glyph_count) const
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{
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TRACE_SANITIZE (this);
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if (!u.header.sanitize (c)) return_trace (false);
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switch (u.header.indexFormat)
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{
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case 1: return_trace (u.format1.sanitize (c, glyph_count));
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case 3: return_trace (u.format3.sanitize (c, glyph_count));
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default:return_trace (true);
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}
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}
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bool
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finish_subtable (hb_serialize_context_t *c,
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unsigned int cbdt_prime_len,
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unsigned int num_glyphs,
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unsigned int *size /* OUT (accumulated) */)
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{
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TRACE_SERIALIZE (this);
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unsigned int local_offset = cbdt_prime_len - u.header.imageDataOffset;
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switch (u.header.indexFormat)
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{
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case 1: return_trace (u.format1.add_offset (c, local_offset, size));
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case 3: {
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if (!u.format3.add_offset (c, local_offset, size))
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return_trace (false);
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if (!(num_glyphs & 0x01)) // Pad to 32-bit alignment if needed.
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return_trace (u.format3.add_offset (c, 0, size));
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return_trace (true);
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}
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// TODO: implement 2, 4, 5.
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case 2: case 4: // No-op.
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case 5: // Pad to 32-bit aligned.
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default: return_trace (false);
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}
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}
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bool
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fill_missing_glyphs (hb_serialize_context_t *c,
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unsigned int cbdt_prime_len,
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unsigned int num_missing,
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unsigned int *size /* OUT (accumulated) */,
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unsigned int *num_glyphs /* OUT (accumulated) */)
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{
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TRACE_SERIALIZE (this);
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unsigned int local_offset = cbdt_prime_len - u.header.imageDataOffset;
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switch (u.header.indexFormat)
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{
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case 1: {
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for (unsigned int i = 0; i < num_missing; i++)
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{
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if (unlikely (!u.format1.add_offset (c, local_offset, size)))
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return_trace (false);
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*num_glyphs += 1;
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}
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return_trace (true);
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}
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case 3: {
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for (unsigned int i = 0; i < num_missing; i++)
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{
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if (unlikely (!u.format3.add_offset (c, local_offset, size)))
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return_trace (false);
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*num_glyphs += 1;
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}
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return_trace (true);
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}
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// TODO: implement 2, 4, 5.
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case 2: // Add empty space in cbdt_prime?.
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case 4: case 5: // No-op as sparse is supported.
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default: return_trace (false);
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}
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}
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bool
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copy_glyph_at_idx (hb_serialize_context_t *c, unsigned int idx,
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const char *cbdt, unsigned int cbdt_length,
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hb_vector_t<char> *cbdt_prime /* INOUT */,
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IndexSubtable *subtable_prime /* INOUT */,
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unsigned int *size /* OUT (accumulated) */) const
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{
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TRACE_SERIALIZE (this);
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unsigned int offset, length, format;
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if (unlikely (!get_image_data (idx, &offset, &length, &format))) return_trace (false);
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if (unlikely (offset > cbdt_length || cbdt_length - offset < length)) return_trace (false);
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auto *header_prime = subtable_prime->get_header ();
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unsigned int new_local_offset = cbdt_prime->length - (unsigned int) header_prime->imageDataOffset;
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if (unlikely (!_copy_data_to_cbdt (cbdt_prime, cbdt + offset, length))) return_trace (false);
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return_trace (subtable_prime->add_offset (c, new_local_offset, size));
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}
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bool
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add_offset (hb_serialize_context_t *c, unsigned int local_offset,
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unsigned int *size /* OUT (accumulated) */)
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{
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TRACE_SERIALIZE (this);
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switch (u.header.indexFormat)
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{
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case 1: return_trace (u.format1.add_offset (c, local_offset, size));
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case 3: return_trace (u.format3.add_offset (c, local_offset, size));
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// TODO: Implement tables 2, 4, 5
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case 2: // Should be a no-op.
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case 4: case 5: // Handle sparse cases.
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default: return_trace (false);
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}
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}
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bool get_extents (hb_glyph_extents_t *extents HB_UNUSED) const
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{
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switch (u.header.indexFormat)
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{
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case 2: case 5: /* TODO */
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case 1: case 3: case 4: /* Variable-metrics formats do not have metrics here. */
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default:return (false);
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}
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}
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bool
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get_image_data (unsigned int idx, unsigned int *offset,
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unsigned int *length, unsigned int *format) const
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{
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*format = u.header.imageFormat;
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switch (u.header.indexFormat)
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{
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case 1: return u.format1.get_image_data (idx, offset, length);
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case 3: return u.format3.get_image_data (idx, offset, length);
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default: return false;
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}
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}
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const IndexSubtableHeader* get_header () const { return &u.header; }
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void populate_header (unsigned index_format,
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unsigned image_format,
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unsigned int image_data_offset,
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unsigned int *size)
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{
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u.header.indexFormat = index_format;
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u.header.imageFormat = image_format;
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u.header.imageDataOffset = image_data_offset;
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switch (u.header.indexFormat)
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{
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case 1: *size += IndexSubtableFormat1::min_size; break;
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case 3: *size += IndexSubtableFormat3::min_size; break;
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}
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}
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protected:
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union {
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IndexSubtableHeader header;
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IndexSubtableFormat1 format1;
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IndexSubtableFormat3 format3;
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/* TODO: Format 2, 4, 5. */
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} u;
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public:
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DEFINE_SIZE_UNION (8, header);
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};
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struct IndexSubtableRecord
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{
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bool sanitize (hb_sanitize_context_t *c, const void *base) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this) &&
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firstGlyphIndex <= lastGlyphIndex &&
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offsetToSubtable.sanitize (c, base, lastGlyphIndex - firstGlyphIndex + 1));
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}
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const IndexSubtable* get_subtable (const void *base) const
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{
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return &(base+offsetToSubtable);
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}
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bool add_new_subtable (hb_subset_context_t* c,
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cblc_bitmap_size_subset_context_t *bitmap_size_context,
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IndexSubtableRecord *record,
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const hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> *lookup, /* IN */
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const void *base,
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unsigned int *start /* INOUT */) const
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{
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TRACE_SERIALIZE (this);
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auto *subtable = c->serializer->start_embed<IndexSubtable> ();
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if (unlikely (!subtable)) return_trace (false);
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if (unlikely (!c->serializer->extend_min (subtable))) return_trace (false);
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auto *old_subtable = get_subtable (base);
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auto *old_header = old_subtable->get_header ();
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subtable->populate_header (old_header->indexFormat,
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old_header->imageFormat,
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bitmap_size_context->cbdt_prime->length,
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&bitmap_size_context->size);
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unsigned int num_glyphs = 0;
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bool early_exit = false;
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for (unsigned int i = *start; i < lookup->length; i++)
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{
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hb_codepoint_t new_gid = (*lookup)[i].first;
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const IndexSubtableRecord *next_record = (*lookup)[i].second;
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const IndexSubtable *next_subtable = next_record->get_subtable (base);
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auto *next_header = next_subtable->get_header ();
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if (next_header != old_header)
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{
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*start = i;
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early_exit = true;
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break;
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}
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unsigned int num_missing = record->add_glyph_for_subset (new_gid);
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if (unlikely (!subtable->fill_missing_glyphs (c->serializer,
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bitmap_size_context->cbdt_prime->length,
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num_missing,
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&bitmap_size_context->size,
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&num_glyphs)))
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return_trace (false);
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hb_codepoint_t old_gid = 0;
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c->plan->old_gid_for_new_gid (new_gid, &old_gid);
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if (old_gid < next_record->firstGlyphIndex)
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return_trace (false);
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unsigned int old_idx = (unsigned int) old_gid - next_record->firstGlyphIndex;
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if (unlikely (!next_subtable->copy_glyph_at_idx (c->serializer,
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old_idx,
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bitmap_size_context->cbdt,
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bitmap_size_context->cbdt_length,
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bitmap_size_context->cbdt_prime,
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subtable,
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&bitmap_size_context->size)))
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return_trace (false);
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num_glyphs += 1;
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}
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if (!early_exit)
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*start = lookup->length;
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if (unlikely (!subtable->finish_subtable (c->serializer,
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bitmap_size_context->cbdt_prime->length,
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num_glyphs,
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&bitmap_size_context->size)))
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return_trace (false);
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return_trace (true);
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}
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bool add_new_record (hb_subset_context_t *c,
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cblc_bitmap_size_subset_context_t *bitmap_size_context,
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const hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> *lookup, /* IN */
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const void *base,
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unsigned int *start, /* INOUT */
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hb_vector_t<IndexSubtableRecord>* records /* INOUT */) const
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{
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TRACE_SERIALIZE (this);
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auto snap = c->serializer->snapshot ();
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unsigned int old_size = bitmap_size_context->size;
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unsigned int old_cbdt_prime_length = bitmap_size_context->cbdt_prime->length;
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// Set to invalid state to indicate filling glyphs is not yet started.
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records->resize (records->length + 1);
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(*records)[records->length - 1].firstGlyphIndex = 1;
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(*records)[records->length - 1].lastGlyphIndex = 0;
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bitmap_size_context->size += IndexSubtableRecord::min_size;
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c->serializer->push ();
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if (unlikely (!add_new_subtable (c, bitmap_size_context, &((*records)[records->length - 1]), lookup, base, start)))
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{
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c->serializer->pop_discard ();
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c->serializer->revert (snap);
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bitmap_size_context->cbdt_prime->shrink (old_cbdt_prime_length);
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bitmap_size_context->size = old_size;
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records->resize (records->length - 1);
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return_trace (false);
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}
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bitmap_size_context->num_tables += 1;
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return_trace (true);
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}
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unsigned int add_glyph_for_subset (hb_codepoint_t gid)
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{
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if (firstGlyphIndex > lastGlyphIndex)
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{
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firstGlyphIndex = gid;
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lastGlyphIndex = gid;
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return 0;
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}
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// TODO maybe assert? this shouldn't occur.
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if (lastGlyphIndex > gid)
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return 0;
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unsigned int num_missing = (unsigned int) (gid - lastGlyphIndex - 1);
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lastGlyphIndex = gid;
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return num_missing;
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}
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bool get_extents (hb_glyph_extents_t *extents, const void *base) const
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{ return (base+offsetToSubtable).get_extents (extents); }
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|
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bool get_image_data (unsigned int gid,
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const void *base,
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unsigned int *offset,
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unsigned int *length,
|
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unsigned int *format) const
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{
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|
if (gid < firstGlyphIndex || gid > lastGlyphIndex) return false;
|
|
return (base+offsetToSubtable).get_image_data (gid - firstGlyphIndex,
|
|
offset, length, format);
|
|
}
|
|
|
|
HBGlyphID firstGlyphIndex;
|
|
HBGlyphID lastGlyphIndex;
|
|
LOffsetTo<IndexSubtable> offsetToSubtable;
|
|
public:
|
|
DEFINE_SIZE_STATIC (8);
|
|
};
|
|
|
|
struct IndexSubtableArray
|
|
{
|
|
friend struct CBDT;
|
|
|
|
bool sanitize (hb_sanitize_context_t *c, unsigned int count) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (indexSubtablesZ.sanitize (c, count, this));
|
|
}
|
|
|
|
void
|
|
build_lookup (hb_subset_context_t *c, cblc_bitmap_size_subset_context_t *bitmap_size_context,
|
|
hb_vector_t<hb_pair_t<hb_codepoint_t,
|
|
const IndexSubtableRecord*>> *lookup /* OUT */) const
|
|
{
|
|
bool start_glyph_is_set = false;
|
|
for (hb_codepoint_t new_gid = 0; new_gid < c->plan->num_output_glyphs (); new_gid++)
|
|
{
|
|
hb_codepoint_t old_gid;
|
|
if (unlikely (!c->plan->old_gid_for_new_gid (new_gid, &old_gid))) continue;
|
|
|
|
const IndexSubtableRecord* record = find_table (old_gid, bitmap_size_context->num_tables);
|
|
if (unlikely (!record)) continue;
|
|
|
|
// Don't add gaps to the lookup. The best way to determine if a glyph is a
|
|
// gap is that it has no image data.
|
|
unsigned int offset, length, format;
|
|
if (unlikely (!record->get_image_data (old_gid, this, &offset, &length, &format))) continue;
|
|
|
|
lookup->push (hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*> (new_gid, record));
|
|
|
|
if (!start_glyph_is_set)
|
|
{
|
|
bitmap_size_context->start_glyph = new_gid;
|
|
start_glyph_is_set = true;
|
|
}
|
|
|
|
bitmap_size_context->end_glyph = new_gid;
|
|
}
|
|
}
|
|
|
|
bool
|
|
subset (hb_subset_context_t *c,
|
|
cblc_bitmap_size_subset_context_t *bitmap_size_context) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
|
|
auto *dst = c->serializer->start_embed<IndexSubtableArray> ();
|
|
if (unlikely (!dst)) return_trace (false);
|
|
|
|
hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> lookup;
|
|
build_lookup (c, bitmap_size_context, &lookup);
|
|
|
|
bitmap_size_context->size = 0;
|
|
bitmap_size_context->num_tables = 0;
|
|
hb_vector_t<IndexSubtableRecord> records;
|
|
for (unsigned int start = 0; start < lookup.length;)
|
|
{
|
|
if (unlikely (!lookup[start].second->add_new_record (c, bitmap_size_context, &lookup, this, &start, &records)))
|
|
{
|
|
// Discard any leftover pushes to the serializer from successful records.
|
|
for (unsigned int i = 0; i < records.length; i++)
|
|
c->serializer->pop_discard ();
|
|
return_trace (false);
|
|
}
|
|
}
|
|
|
|
/* Workaround to ensure offset ordering is from least to greatest when
|
|
* resolving links. */
|
|
hb_vector_t<hb_serialize_context_t::objidx_t> objidxs;
|
|
for (unsigned int i = 0; i < records.length; i++)
|
|
objidxs.push (c->serializer->pop_pack ());
|
|
for (unsigned int i = 0; i < records.length; i++)
|
|
{
|
|
IndexSubtableRecord* record = c->serializer->embed (records[i]);
|
|
if (unlikely (!record)) return_trace (false);
|
|
c->serializer->add_link (record->offsetToSubtable, objidxs[records.length - 1 - i]);
|
|
}
|
|
return_trace (true);
|
|
}
|
|
|
|
public:
|
|
const IndexSubtableRecord* find_table (hb_codepoint_t glyph, unsigned int numTables) const
|
|
{
|
|
for (unsigned int i = 0; i < numTables; ++i)
|
|
{
|
|
unsigned int firstGlyphIndex = indexSubtablesZ[i].firstGlyphIndex;
|
|
unsigned int lastGlyphIndex = indexSubtablesZ[i].lastGlyphIndex;
|
|
if (firstGlyphIndex <= glyph && glyph <= lastGlyphIndex)
|
|
return &indexSubtablesZ[i];
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
protected:
|
|
UnsizedArrayOf<IndexSubtableRecord> indexSubtablesZ;
|
|
};
|
|
|
|
struct BitmapSizeTable
|
|
{
|
|
friend struct CBLC;
|
|
friend struct CBDT;
|
|
|
|
bool sanitize (hb_sanitize_context_t *c, const void *base) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (c->check_struct (this) &&
|
|
indexSubtableArrayOffset.sanitize (c, base, numberOfIndexSubtables) &&
|
|
horizontal.sanitize (c) &&
|
|
vertical.sanitize (c));
|
|
}
|
|
|
|
const IndexSubtableRecord *
|
|
find_table (hb_codepoint_t glyph, const void *base, const void **out_base) const
|
|
{
|
|
*out_base = &(base+indexSubtableArrayOffset);
|
|
return (base+indexSubtableArrayOffset).find_table (glyph, numberOfIndexSubtables);
|
|
}
|
|
|
|
bool
|
|
subset (hb_subset_context_t *c, const void *base,
|
|
const char *cbdt, unsigned int cbdt_length,
|
|
hb_vector_t<char> *cbdt_prime /* INOUT */) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
auto *out_table = c->serializer->embed (this);
|
|
if (unlikely (!out_table)) return_trace (false);
|
|
|
|
cblc_bitmap_size_subset_context_t bitmap_size_context;
|
|
bitmap_size_context.cbdt = cbdt;
|
|
bitmap_size_context.cbdt_length = cbdt_length;
|
|
bitmap_size_context.cbdt_prime = cbdt_prime;
|
|
bitmap_size_context.size = indexTablesSize;
|
|
bitmap_size_context.num_tables = numberOfIndexSubtables;
|
|
bitmap_size_context.start_glyph = 1;
|
|
bitmap_size_context.end_glyph = 0;
|
|
|
|
if (!out_table->indexSubtableArrayOffset.serialize_subset (c,
|
|
indexSubtableArrayOffset,
|
|
base,
|
|
&bitmap_size_context))
|
|
return_trace (false);
|
|
if (!bitmap_size_context.size ||
|
|
!bitmap_size_context.num_tables ||
|
|
bitmap_size_context.start_glyph > bitmap_size_context.end_glyph)
|
|
return_trace (false);
|
|
|
|
out_table->indexTablesSize = bitmap_size_context.size;
|
|
out_table->numberOfIndexSubtables = bitmap_size_context.num_tables;
|
|
out_table->startGlyphIndex = bitmap_size_context.start_glyph;
|
|
out_table->endGlyphIndex = bitmap_size_context.end_glyph;
|
|
return_trace (true);
|
|
}
|
|
|
|
protected:
|
|
LNNOffsetTo<IndexSubtableArray>
|
|
indexSubtableArrayOffset;
|
|
HBUINT32 indexTablesSize;
|
|
HBUINT32 numberOfIndexSubtables;
|
|
HBUINT32 colorRef;
|
|
SBitLineMetrics horizontal;
|
|
SBitLineMetrics vertical;
|
|
HBGlyphID startGlyphIndex;
|
|
HBGlyphID endGlyphIndex;
|
|
HBUINT8 ppemX;
|
|
HBUINT8 ppemY;
|
|
HBUINT8 bitDepth;
|
|
HBINT8 flags;
|
|
public:
|
|
DEFINE_SIZE_STATIC (48);
|
|
};
|
|
|
|
|
|
/*
|
|
* Glyph Bitmap Data Formats.
|
|
*/
|
|
|
|
struct GlyphBitmapDataFormat17
|
|
{
|
|
SmallGlyphMetrics glyphMetrics;
|
|
LArrayOf<HBUINT8> data;
|
|
public:
|
|
DEFINE_SIZE_ARRAY (9, data);
|
|
};
|
|
|
|
struct GlyphBitmapDataFormat18
|
|
{
|
|
BigGlyphMetrics glyphMetrics;
|
|
LArrayOf<HBUINT8> data;
|
|
public:
|
|
DEFINE_SIZE_ARRAY (12, data);
|
|
};
|
|
|
|
struct GlyphBitmapDataFormat19
|
|
{
|
|
LArrayOf<HBUINT8> data;
|
|
public:
|
|
DEFINE_SIZE_ARRAY (4, data);
|
|
};
|
|
|
|
struct CBLC
|
|
{
|
|
friend struct CBDT;
|
|
|
|
static constexpr hb_tag_t tableTag = HB_OT_TAG_CBLC;
|
|
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (c->check_struct (this) &&
|
|
likely (version.major == 2 || version.major == 3) &&
|
|
sizeTables.sanitize (c, this));
|
|
}
|
|
|
|
static bool
|
|
sink_cbdt (hb_subset_context_t *c, hb_vector_t<char>* cbdt_prime)
|
|
{
|
|
hb_blob_t *cbdt_prime_blob = hb_blob_create (cbdt_prime->arrayZ,
|
|
cbdt_prime->length,
|
|
HB_MEMORY_MODE_WRITABLE,
|
|
cbdt_prime->arrayZ,
|
|
free);
|
|
cbdt_prime->init (); // Leak arrayZ to the blob.
|
|
bool ret = c->plan->add_table (HB_OT_TAG_CBDT, cbdt_prime_blob);
|
|
hb_blob_destroy (cbdt_prime_blob);
|
|
return ret;
|
|
}
|
|
|
|
bool
|
|
subset_size_table (hb_subset_context_t *c, const BitmapSizeTable& table,
|
|
const char *cbdt /* IN */, unsigned int cbdt_length,
|
|
CBLC *cblc_prime /* INOUT */, hb_vector_t<char> *cbdt_prime /* INOUT */) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
cblc_prime->sizeTables.len++;
|
|
|
|
auto snap = c->serializer->snapshot ();
|
|
auto cbdt_prime_len = cbdt_prime->length;
|
|
|
|
if (!table.subset (c, this, cbdt, cbdt_length, cbdt_prime))
|
|
{
|
|
cblc_prime->sizeTables.len--;
|
|
c->serializer->revert (snap);
|
|
cbdt_prime->shrink (cbdt_prime_len);
|
|
return_trace (false);
|
|
}
|
|
return_trace (true);
|
|
}
|
|
|
|
// Implemented in cc file as it depends on definition of CBDT.
|
|
HB_INTERNAL bool subset (hb_subset_context_t *c) const;
|
|
|
|
protected:
|
|
const BitmapSizeTable &choose_strike (hb_font_t *font) const
|
|
{
|
|
unsigned count = sizeTables.len;
|
|
if (unlikely (!count))
|
|
return Null (BitmapSizeTable);
|
|
|
|
unsigned int requested_ppem = hb_max (font->x_ppem, font->y_ppem);
|
|
if (!requested_ppem)
|
|
requested_ppem = 1<<30; /* Choose largest strike. */
|
|
unsigned int best_i = 0;
|
|
unsigned int best_ppem = hb_max (sizeTables[0].ppemX, sizeTables[0].ppemY);
|
|
|
|
for (unsigned int i = 1; i < count; i++)
|
|
{
|
|
unsigned int ppem = hb_max (sizeTables[i].ppemX, sizeTables[i].ppemY);
|
|
if ((requested_ppem <= ppem && ppem < best_ppem) ||
|
|
(requested_ppem > best_ppem && ppem > best_ppem))
|
|
{
|
|
best_i = i;
|
|
best_ppem = ppem;
|
|
}
|
|
}
|
|
|
|
return sizeTables[best_i];
|
|
}
|
|
|
|
protected:
|
|
FixedVersion<> version;
|
|
LArrayOf<BitmapSizeTable> sizeTables;
|
|
public:
|
|
DEFINE_SIZE_ARRAY (8, sizeTables);
|
|
};
|
|
|
|
struct CBDT
|
|
{
|
|
static constexpr hb_tag_t tableTag = HB_OT_TAG_CBDT;
|
|
|
|
struct accelerator_t
|
|
{
|
|
void init (hb_face_t *face)
|
|
{
|
|
cblc = hb_sanitize_context_t ().reference_table<CBLC> (face);
|
|
cbdt = hb_sanitize_context_t ().reference_table<CBDT> (face);
|
|
|
|
upem = hb_face_get_upem (face);
|
|
}
|
|
|
|
void fini ()
|
|
{
|
|
this->cblc.destroy ();
|
|
this->cbdt.destroy ();
|
|
}
|
|
|
|
bool
|
|
get_extents (hb_font_t *font, hb_codepoint_t glyph, hb_glyph_extents_t *extents) const
|
|
{
|
|
const void *base;
|
|
const BitmapSizeTable &strike = this->cblc->choose_strike (font);
|
|
const IndexSubtableRecord *subtable_record = strike.find_table (glyph, cblc, &base);
|
|
if (!subtable_record || !strike.ppemX || !strike.ppemY)
|
|
return false;
|
|
|
|
if (subtable_record->get_extents (extents, base))
|
|
return true;
|
|
|
|
unsigned int image_offset = 0, image_length = 0, image_format = 0;
|
|
if (!subtable_record->get_image_data (glyph, base, &image_offset, &image_length, &image_format))
|
|
return false;
|
|
|
|
unsigned int cbdt_len = cbdt.get_length ();
|
|
if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
|
|
return false;
|
|
|
|
switch (image_format)
|
|
{
|
|
case 17: {
|
|
if (unlikely (image_length < GlyphBitmapDataFormat17::min_size))
|
|
return false;
|
|
auto &glyphFormat17 = StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset);
|
|
glyphFormat17.glyphMetrics.get_extents (font, extents);
|
|
break;
|
|
}
|
|
case 18: {
|
|
if (unlikely (image_length < GlyphBitmapDataFormat18::min_size))
|
|
return false;
|
|
auto &glyphFormat18 = StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset);
|
|
glyphFormat18.glyphMetrics.get_extents (font, extents);
|
|
break;
|
|
}
|
|
default: return false; /* TODO: Support other image formats. */
|
|
}
|
|
|
|
/* Convert to font units. */
|
|
float x_scale = upem / (float) strike.ppemX;
|
|
float y_scale = upem / (float) strike.ppemY;
|
|
extents->x_bearing = roundf (extents->x_bearing * x_scale);
|
|
extents->y_bearing = roundf (extents->y_bearing * y_scale);
|
|
extents->width = roundf (extents->width * x_scale);
|
|
extents->height = roundf (extents->height * y_scale);
|
|
|
|
return true;
|
|
}
|
|
|
|
hb_blob_t*
|
|
reference_png (hb_font_t *font, hb_codepoint_t glyph) const
|
|
{
|
|
const void *base;
|
|
const BitmapSizeTable &strike = this->cblc->choose_strike (font);
|
|
const IndexSubtableRecord *subtable_record = strike.find_table (glyph, cblc, &base);
|
|
if (!subtable_record || !strike.ppemX || !strike.ppemY)
|
|
return hb_blob_get_empty ();
|
|
|
|
unsigned int image_offset = 0, image_length = 0, image_format = 0;
|
|
if (!subtable_record->get_image_data (glyph, base, &image_offset, &image_length, &image_format))
|
|
return hb_blob_get_empty ();
|
|
|
|
unsigned int cbdt_len = cbdt.get_length ();
|
|
if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
|
|
return hb_blob_get_empty ();
|
|
|
|
switch (image_format)
|
|
{
|
|
case 17:
|
|
{
|
|
if (unlikely (image_length < GlyphBitmapDataFormat17::min_size))
|
|
return hb_blob_get_empty ();
|
|
auto &glyphFormat17 = StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset);
|
|
return hb_blob_create_sub_blob (cbdt.get_blob (),
|
|
image_offset + GlyphBitmapDataFormat17::min_size,
|
|
glyphFormat17.data.len);
|
|
}
|
|
case 18:
|
|
{
|
|
if (unlikely (image_length < GlyphBitmapDataFormat18::min_size))
|
|
return hb_blob_get_empty ();
|
|
auto &glyphFormat18 = StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset);
|
|
return hb_blob_create_sub_blob (cbdt.get_blob (),
|
|
image_offset + GlyphBitmapDataFormat18::min_size,
|
|
glyphFormat18.data.len);
|
|
}
|
|
case 19:
|
|
{
|
|
if (unlikely (image_length < GlyphBitmapDataFormat19::min_size))
|
|
return hb_blob_get_empty ();
|
|
auto &glyphFormat19 = StructAtOffset<GlyphBitmapDataFormat19> (this->cbdt, image_offset);
|
|
return hb_blob_create_sub_blob (cbdt.get_blob (),
|
|
image_offset + GlyphBitmapDataFormat19::min_size,
|
|
glyphFormat19.data.len);
|
|
}
|
|
default: return hb_blob_get_empty (); /* TODO: Support other image formats. */
|
|
}
|
|
}
|
|
|
|
bool has_data () const { return cbdt.get_length (); }
|
|
|
|
private:
|
|
hb_blob_ptr_t<CBLC> cblc;
|
|
hb_blob_ptr_t<CBDT> cbdt;
|
|
|
|
unsigned int upem;
|
|
};
|
|
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (c->check_struct (this) &&
|
|
likely (version.major == 2 || version.major == 3));
|
|
}
|
|
|
|
protected:
|
|
FixedVersion<> version;
|
|
UnsizedArrayOf<HBUINT8> dataZ;
|
|
public:
|
|
DEFINE_SIZE_ARRAY (4, dataZ);
|
|
};
|
|
|
|
inline bool
|
|
CBLC::subset (hb_subset_context_t *c) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
|
|
auto *cblc_prime = c->serializer->start_embed<CBLC> ();
|
|
|
|
// Use a vector as a secondary buffer as the tables need to be built in parallel.
|
|
hb_vector_t<char> cbdt_prime;
|
|
|
|
if (unlikely (!cblc_prime)) return_trace (false);
|
|
if (unlikely (!c->serializer->extend_min (cblc_prime))) return_trace (false);
|
|
cblc_prime->version = version;
|
|
|
|
hb_blob_t* cbdt_blob = hb_sanitize_context_t ().reference_table<CBDT> (c->plan->source);
|
|
unsigned int cbdt_length;
|
|
CBDT* cbdt = (CBDT *) hb_blob_get_data (cbdt_blob, &cbdt_length);
|
|
if (unlikely (cbdt_length < CBDT::min_size))
|
|
{
|
|
hb_blob_destroy (cbdt_blob);
|
|
return_trace (false);
|
|
}
|
|
_copy_data_to_cbdt (&cbdt_prime, cbdt, CBDT::min_size);
|
|
|
|
for (const BitmapSizeTable& table : + sizeTables.iter ())
|
|
subset_size_table (c, table, (const char *) cbdt, cbdt_length, cblc_prime, &cbdt_prime);
|
|
|
|
hb_blob_destroy (cbdt_blob);
|
|
|
|
return_trace (CBLC::sink_cbdt (c, &cbdt_prime));
|
|
}
|
|
|
|
struct CBDT_accelerator_t : CBDT::accelerator_t {};
|
|
|
|
} /* namespace OT */
|
|
|
|
#endif /* HB_OT_COLOR_CBDT_TABLE_HH */
|