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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-cbdt-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-cbdt-table.hh | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-cbdt-table.hh b/gfx/harfbuzz/src/hb-ot-cbdt-table.hh new file mode 100644 index 000000000..52897abd3 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-cbdt-table.hh @@ -0,0 +1,384 @@ +/* + * Copyright © 2016 Google, Inc. + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + * + * Google Author(s): Seigo Nonaka + */ + +#ifndef HB_OT_CBDT_TABLE_HH +#define HB_OT_CBDT_TABLE_HH + +#include "hb-open-type-private.hh" + +namespace OT { + +struct SmallGlyphMetrics +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + inline void get_extents (hb_glyph_extents_t *extents) const + { + extents->x_bearing = bearingX; + extents->y_bearing = bearingY; + extents->width = width; + extents->height = -height; + } + + BYTE height; + BYTE width; + CHAR bearingX; + CHAR bearingY; + BYTE advance; + + DEFINE_SIZE_STATIC(5); +}; + +struct BigGlyphMetrics : SmallGlyphMetrics +{ + CHAR vertBearingX; + CHAR vertBearingY; + BYTE vertAdvance; + + DEFINE_SIZE_STATIC(8); +}; + +struct SBitLineMetrics +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + CHAR ascender; + CHAR decender; + BYTE widthMax; + CHAR caretSlopeNumerator; + CHAR caretSlopeDenominator; + CHAR caretOffset; + CHAR minOriginSB; + CHAR minAdvanceSB; + CHAR maxBeforeBL; + CHAR minAfterBL; + CHAR padding1; + CHAR padding2; + + DEFINE_SIZE_STATIC(12); +}; + + +/* + * Index Subtables. + */ + +struct IndexSubtableHeader +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + USHORT indexFormat; + USHORT imageFormat; + ULONG imageDataOffset; + + DEFINE_SIZE_STATIC(8); +}; + +template <typename OffsetType> +struct IndexSubtableFormat1Or3 +{ + inline bool sanitize (hb_sanitize_context_t *c, unsigned int glyph_count) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + c->check_array (offsetArrayZ, offsetArrayZ[0].static_size, glyph_count + 1)); + } + + bool get_image_data (unsigned int idx, + unsigned int *offset, + unsigned int *length) const + { + if (unlikely (offsetArrayZ[idx + 1] <= offsetArrayZ[idx])) + return false; + + *offset = header.imageDataOffset + offsetArrayZ[idx]; + *length = offsetArrayZ[idx + 1] - offsetArrayZ[idx]; + return true; + } + + IndexSubtableHeader header; + Offset<OffsetType> offsetArrayZ[VAR]; + + DEFINE_SIZE_ARRAY(8, offsetArrayZ); +}; + +struct IndexSubtableFormat1 : IndexSubtableFormat1Or3<ULONG> {}; +struct IndexSubtableFormat3 : IndexSubtableFormat1Or3<USHORT> {}; + +struct IndexSubtable +{ + inline bool sanitize (hb_sanitize_context_t *c, unsigned int glyph_count) const + { + TRACE_SANITIZE (this); + if (!u.header.sanitize (c)) return_trace (false); + switch (u.header.indexFormat) { + case 1: return_trace (u.format1.sanitize (c, glyph_count)); + case 3: return_trace (u.format3.sanitize (c, glyph_count)); + default:return_trace (true); + } + } + + inline bool get_extents (hb_glyph_extents_t *extents) const + { + switch (u.header.indexFormat) { + case 2: case 5: /* TODO */ + case 1: case 3: case 4: /* Variable-metrics formats do not have metrics here. */ + default:return (false); + } + } + + bool get_image_data (unsigned int idx, + unsigned int *offset, + unsigned int *length, + unsigned int *format) const + { + *format = u.header.imageFormat; + switch (u.header.indexFormat) { + case 1: return u.format1.get_image_data (idx, offset, length); + case 3: return u.format3.get_image_data (idx, offset, length); + default: return false; + } + } + + protected: + union { + IndexSubtableHeader header; + IndexSubtableFormat1 format1; + IndexSubtableFormat3 format3; + /* TODO: Format 2, 4, 5. */ + } u; + public: + DEFINE_SIZE_UNION (8, header); +}; + +struct IndexSubtableRecord +{ + inline bool sanitize (hb_sanitize_context_t *c, const void *base) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + firstGlyphIndex <= lastGlyphIndex && + offsetToSubtable.sanitize (c, this, lastGlyphIndex - firstGlyphIndex + 1)); + } + + inline bool get_extents (hb_glyph_extents_t *extents) const + { + return (this+offsetToSubtable).get_extents (extents); + } + + bool get_image_data (unsigned int gid, + unsigned int *offset, + unsigned int *length, + unsigned int *format) const + { + if (gid < firstGlyphIndex || gid > lastGlyphIndex) + { + return false; + } + return (this+offsetToSubtable).get_image_data (gid - firstGlyphIndex, + offset, length, format); + } + + USHORT firstGlyphIndex; + USHORT lastGlyphIndex; + OffsetTo<IndexSubtable, ULONG> offsetToSubtable; + + DEFINE_SIZE_STATIC(8); +}; + +struct IndexSubtableArray +{ + inline bool sanitize (hb_sanitize_context_t *c, unsigned int count) const + { + TRACE_SANITIZE (this); + if (unlikely (!c->check_array (&indexSubtablesZ, indexSubtablesZ[0].static_size, count))) + return_trace (false); + for (unsigned int i = 0; i < count; i++) + if (unlikely (!indexSubtablesZ[i].sanitize (c, this))) + return_trace (false); + 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 NULL; + } + + protected: + IndexSubtableRecord indexSubtablesZ[VAR]; + + public: + DEFINE_SIZE_ARRAY(0, indexSubtablesZ); +}; + +struct BitmapSizeTable +{ + friend struct CBLC; + + inline 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) && + c->check_range (&(base+indexSubtableArrayOffset), indexTablesSize) && + horizontal.sanitize (c) && + vertical.sanitize (c)); + } + + const IndexSubtableRecord *find_table (hb_codepoint_t glyph, const void *base) const + { + return (base+indexSubtableArrayOffset).find_table (glyph, numberOfIndexSubtables); + } + + protected: + OffsetTo<IndexSubtableArray, ULONG> indexSubtableArrayOffset; + ULONG indexTablesSize; + ULONG numberOfIndexSubtables; + ULONG colorRef; + SBitLineMetrics horizontal; + SBitLineMetrics vertical; + USHORT startGlyphIndex; + USHORT endGlyphIndex; + BYTE ppemX; + BYTE ppemY; + BYTE bitDepth; + CHAR flags; + +public: + DEFINE_SIZE_STATIC(48); +}; + + +/* + * Glyph Bitmap Data Formats. + */ + +struct GlyphBitmapDataFormat17 +{ + SmallGlyphMetrics glyphMetrics; + ULONG dataLen; + BYTE dataZ[VAR]; + + DEFINE_SIZE_ARRAY(9, dataZ); +}; + + +/* + * CBLC -- Color Bitmap Location Table + */ + +#define HB_OT_TAG_CBLC HB_TAG('C','B','L','C') + +struct CBLC +{ + static const hb_tag_t tableTag = HB_OT_TAG_CBLC; + + inline 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)); + } + + public: + const IndexSubtableRecord *find_table (hb_codepoint_t glyph, + unsigned int *x_ppem, unsigned int *y_ppem) const + { + /* TODO: Make it possible to select strike. */ + + unsigned int count = sizeTables.len; + for (uint32_t i = 0; i < count; ++i) + { + unsigned int startGlyphIndex = sizeTables.array[i].startGlyphIndex; + unsigned int endGlyphIndex = sizeTables.array[i].endGlyphIndex; + if (startGlyphIndex <= glyph && glyph <= endGlyphIndex) + { + *x_ppem = sizeTables[i].ppemX; + *y_ppem = sizeTables[i].ppemY; + return sizeTables[i].find_table (glyph, this); + } + } + + return NULL; + } + + protected: + FixedVersion<>version; + ArrayOf<BitmapSizeTable, ULONG> sizeTables; + + public: + DEFINE_SIZE_ARRAY(8, sizeTables); +}; + +/* + * CBDT -- Color Bitmap Data Table + */ +#define HB_OT_TAG_CBDT HB_TAG('C','B','D','T') + +struct CBDT +{ + static const hb_tag_t tableTag = HB_OT_TAG_CBDT; + + inline 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; + BYTE dataZ[VAR]; + + public: + DEFINE_SIZE_ARRAY(4, dataZ); +}; + +} /* namespace OT */ + +#endif /* HB_OT_CBDT_TABLE_HH */ |