82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
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// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Data model for a font file in sfnt format, reading and writing functions and
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// accessors for the glyph data.
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#ifndef BROTLI_WOFF2_FONT_H_
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#define BROTLI_WOFF2_FONT_H_
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#include <stddef.h>
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#include <inttypes.h>
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#include <map>
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#include <vector>
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namespace woff2 {
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// Tags of popular tables.
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static const uint32_t kGlyfTableTag = 0x676c7966;
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static const uint32_t kHeadTableTag = 0x68656164;
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static const uint32_t kLocaTableTag = 0x6c6f6361;
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// Represents an sfnt font file. Only the table directory is parsed, for the
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// table data we only store a raw pointer, therefore a font object is valid only
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// as long the data from which it was parsed is around.
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struct Font {
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uint32_t flavor;
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uint16_t num_tables;
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struct Table {
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uint32_t tag;
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uint32_t checksum;
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uint32_t offset;
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uint32_t length;
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const uint8_t* data;
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// Buffer used to mutate the data before writing out.
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std::vector<uint8_t> buffer;
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};
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std::map<uint32_t, Table> tables;
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Table* FindTable(uint32_t tag);
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const Table* FindTable(uint32_t tag) const;
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};
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// Parses the font from the given data. Returns false on parsing failure or
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// buffer overflow. The font is valid only so long the input data pointer is
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// valid.
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bool ReadFont(const uint8_t* data, size_t len, Font* font);
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// Returns the file size of the font.
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size_t FontFileSize(const Font& font);
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// Writes the font into the specified dst buffer. The dst_size should be the
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// same as returned by FontFileSize(). Returns false upon buffer overflow (which
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// should not happen if dst_size was computed by FontFileSize()).
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bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size);
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// Returns the number of glyphs in the font.
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// NOTE: Currently this works only for TrueType-flavored fonts, will return
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// zero for CFF-flavored fonts.
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int NumGlyphs(const Font& font);
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// Sets *glyph_data and *glyph_size to point to the location of the glyph data
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// with the given index. Returns false if the glyph is not found.
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bool GetGlyphData(const Font& font, int glyph_index,
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const uint8_t** glyph_data, size_t* glyph_size);
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} // namespace woff2
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#endif // BROTLI_WOFF2_FONT_H_
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