472 lines
11 KiB
C++
472 lines
11 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
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*/
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#ifndef HB_OT_CBDT_TABLE_HH
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#define HB_OT_CBDT_TABLE_HH
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#include "hb-open-type-private.hh"
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namespace OT {
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struct SmallGlyphMetrics
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{
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inline 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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inline void get_extents (hb_glyph_extents_t *extents) const
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{
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extents->x_bearing = bearingX;
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extents->y_bearing = bearingY;
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extents->width = width;
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extents->height = -height;
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}
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BYTE height;
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BYTE width;
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CHAR bearingX;
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CHAR bearingY;
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BYTE advance;
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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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CHAR vertBearingX;
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CHAR vertBearingY;
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BYTE vertAdvance;
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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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inline 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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CHAR ascender;
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CHAR decender;
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BYTE widthMax;
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CHAR caretSlopeNumerator;
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CHAR caretSlopeDenominator;
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CHAR caretOffset;
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CHAR minOriginSB;
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CHAR minAdvanceSB;
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CHAR maxBeforeBL;
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CHAR minAfterBL;
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CHAR padding1;
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CHAR padding2;
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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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inline 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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USHORT indexFormat;
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USHORT imageFormat;
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ULONG imageDataOffset;
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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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inline 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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c->check_array (offsetArrayZ, offsetArrayZ[0].static_size, 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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IndexSubtableHeader header;
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Offset<OffsetType> offsetArrayZ[VAR];
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DEFINE_SIZE_ARRAY(8, offsetArrayZ);
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};
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struct IndexSubtableFormat1 : IndexSubtableFormat1Or3<ULONG> {};
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struct IndexSubtableFormat3 : IndexSubtableFormat1Or3<USHORT> {};
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struct IndexSubtable
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{
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inline 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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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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inline bool get_extents (hb_glyph_extents_t *extents) const
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{
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switch (u.header.indexFormat) {
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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 get_image_data (unsigned int idx,
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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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*format = u.header.imageFormat;
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switch (u.header.indexFormat) {
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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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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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inline 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, this, lastGlyphIndex - firstGlyphIndex + 1));
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}
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inline bool get_extents (hb_glyph_extents_t *extents) const
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{
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return (this+offsetToSubtable).get_extents (extents);
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}
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bool get_image_data (unsigned int gid,
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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)
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{
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return false;
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}
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return (this+offsetToSubtable).get_image_data (gid - firstGlyphIndex,
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offset, length, format);
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}
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USHORT firstGlyphIndex;
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USHORT lastGlyphIndex;
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LOffsetTo<IndexSubtable> offsetToSubtable;
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DEFINE_SIZE_STATIC(8);
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};
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struct IndexSubtableArray
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{
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inline bool sanitize (hb_sanitize_context_t *c, unsigned int count) const
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{
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TRACE_SANITIZE (this);
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if (unlikely (!c->check_array (&indexSubtablesZ, indexSubtablesZ[0].static_size, count)))
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return_trace (false);
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for (unsigned int i = 0; i < count; i++)
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if (unlikely (!indexSubtablesZ[i].sanitize (c, this)))
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return_trace (false);
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return_trace (true);
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}
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public:
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const IndexSubtableRecord* find_table (hb_codepoint_t glyph, unsigned int numTables) const
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{
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for (unsigned int i = 0; i < numTables; ++i)
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{
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unsigned int firstGlyphIndex = indexSubtablesZ[i].firstGlyphIndex;
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unsigned int lastGlyphIndex = indexSubtablesZ[i].lastGlyphIndex;
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if (firstGlyphIndex <= glyph && glyph <= lastGlyphIndex) {
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return &indexSubtablesZ[i];
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}
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}
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return nullptr;
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}
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protected:
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IndexSubtableRecord indexSubtablesZ[VAR];
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public:
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DEFINE_SIZE_ARRAY(0, indexSubtablesZ);
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};
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struct BitmapSizeTable
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{
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friend struct CBLC;
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inline 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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indexSubtableArrayOffset.sanitize (c, base, numberOfIndexSubtables) &&
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c->check_range (&(base+indexSubtableArrayOffset), indexTablesSize) &&
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horizontal.sanitize (c) &&
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vertical.sanitize (c));
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}
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const IndexSubtableRecord *find_table (hb_codepoint_t glyph, const void *base) const
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{
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return (base+indexSubtableArrayOffset).find_table (glyph, numberOfIndexSubtables);
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}
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protected:
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LOffsetTo<IndexSubtableArray> indexSubtableArrayOffset;
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ULONG indexTablesSize;
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ULONG numberOfIndexSubtables;
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ULONG colorRef;
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SBitLineMetrics horizontal;
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SBitLineMetrics vertical;
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USHORT startGlyphIndex;
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USHORT endGlyphIndex;
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BYTE ppemX;
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BYTE ppemY;
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BYTE bitDepth;
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CHAR flags;
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public:
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DEFINE_SIZE_STATIC(48);
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};
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/*
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* Glyph Bitmap Data Formats.
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*/
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struct GlyphBitmapDataFormat17
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{
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SmallGlyphMetrics glyphMetrics;
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ULONG dataLen;
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BYTE dataZ[VAR];
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DEFINE_SIZE_ARRAY(9, dataZ);
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};
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/*
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* CBLC -- Color Bitmap Location Table
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*/
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#define HB_OT_TAG_CBLC HB_TAG('C','B','L','C')
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struct CBLC
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{
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friend struct CBDT;
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static const hb_tag_t tableTag = HB_OT_TAG_CBLC;
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inline 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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likely (version.major == 2 || version.major == 3) &&
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sizeTables.sanitize (c, this));
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}
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protected:
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const IndexSubtableRecord *find_table (hb_codepoint_t glyph,
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unsigned int *x_ppem, unsigned int *y_ppem) const
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{
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/* TODO: Make it possible to select strike. */
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unsigned int count = sizeTables.len;
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for (uint32_t i = 0; i < count; ++i)
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{
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unsigned int startGlyphIndex = sizeTables.array[i].startGlyphIndex;
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unsigned int endGlyphIndex = sizeTables.array[i].endGlyphIndex;
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if (startGlyphIndex <= glyph && glyph <= endGlyphIndex)
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{
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*x_ppem = sizeTables[i].ppemX;
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*y_ppem = sizeTables[i].ppemY;
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return sizeTables[i].find_table (glyph, this);
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}
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}
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return nullptr;
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}
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protected:
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FixedVersion<> version;
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LArrayOf<BitmapSizeTable> sizeTables;
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public:
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DEFINE_SIZE_ARRAY(8, sizeTables);
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};
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/*
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* CBDT -- Color Bitmap Data Table
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*/
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#define HB_OT_TAG_CBDT HB_TAG('C','B','D','T')
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struct CBDT
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{
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static const hb_tag_t tableTag = HB_OT_TAG_CBDT;
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inline 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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likely (version.major == 2 || version.major == 3));
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}
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struct accelerator_t
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{
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inline void init (hb_face_t *face)
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{
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upem = face->get_upem();
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cblc_blob = Sanitizer<CBLC>::sanitize (face->reference_table (HB_OT_TAG_CBLC));
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cbdt_blob = Sanitizer<CBDT>::sanitize (face->reference_table (HB_OT_TAG_CBDT));
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cbdt_len = hb_blob_get_length (cbdt_blob);
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if (hb_blob_get_length (cblc_blob) == 0) {
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cblc = nullptr;
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cbdt = nullptr;
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return; /* Not a bitmap font. */
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}
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cblc = Sanitizer<CBLC>::lock_instance (cblc_blob);
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cbdt = Sanitizer<CBDT>::lock_instance (cbdt_blob);
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}
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inline void fini (void)
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{
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hb_blob_destroy (this->cblc_blob);
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hb_blob_destroy (this->cbdt_blob);
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}
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inline bool get_extents (hb_codepoint_t glyph, hb_glyph_extents_t *extents) const
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{
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unsigned int x_ppem = upem, y_ppem = upem; /* TODO Use font ppem if available. */
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if (!cblc)
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return false; // Not a color bitmap font.
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const IndexSubtableRecord *subtable_record = this->cblc->find_table(glyph, &x_ppem, &y_ppem);
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if (!subtable_record || !x_ppem || !y_ppem)
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return false;
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if (subtable_record->get_extents (extents))
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return true;
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unsigned int image_offset = 0, image_length = 0, image_format = 0;
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if (!subtable_record->get_image_data (glyph, &image_offset, &image_length, &image_format))
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return false;
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{
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if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
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return false;
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switch (image_format)
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{
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case 17: {
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if (unlikely (image_length < GlyphBitmapDataFormat17::min_size))
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return false;
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const GlyphBitmapDataFormat17& glyphFormat17 =
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StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset);
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glyphFormat17.glyphMetrics.get_extents (extents);
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}
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break;
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default:
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// TODO: Support other image formats.
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return false;
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}
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}
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/* Convert to the font units. */
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extents->x_bearing *= upem / (float) x_ppem;
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extents->y_bearing *= upem / (float) y_ppem;
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extents->width *= upem / (float) x_ppem;
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extents->height *= upem / (float) y_ppem;
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return true;
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}
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private:
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hb_blob_t *cblc_blob;
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hb_blob_t *cbdt_blob;
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const CBLC *cblc;
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const CBDT *cbdt;
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unsigned int cbdt_len;
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unsigned int upem;
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};
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protected:
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FixedVersion<>version;
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BYTE dataZ[VAR];
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public:
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DEFINE_SIZE_ARRAY(4, dataZ);
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};
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} /* namespace OT */
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#endif /* HB_OT_CBDT_TABLE_HH */
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