diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /modules/woff2/src/font.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'modules/woff2/src/font.h')
-rw-r--r-- | modules/woff2/src/font.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/modules/woff2/src/font.h b/modules/woff2/src/font.h new file mode 100644 index 0000000000..7b8ddddc5a --- /dev/null +++ b/modules/woff2/src/font.h @@ -0,0 +1,105 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Data model for a font file in sfnt format, reading and writing functions and + accessors for the glyph data. */ + +#ifndef WOFF2_FONT_H_ +#define WOFF2_FONT_H_ + +#include <stddef.h> +#include <inttypes.h> +#include <map> +#include <vector> + +namespace woff2 { + +// Represents an sfnt font file. Only the table directory is parsed, for the +// table data we only store a raw pointer, therefore a font object is valid only +// as long the data from which it was parsed is around. +struct Font { + uint32_t flavor; + uint16_t num_tables; + + struct Table { + uint32_t tag; + uint32_t checksum; + uint32_t offset; + uint32_t length; + const uint8_t* data; + + // Buffer used to mutate the data before writing out. + std::vector<uint8_t> buffer; + + // If we've seen this tag/offset before, pointer to the first time we saw it + // If this is the first time we've seen this table, NULL + // Intended use is to bypass re-processing tables + Font::Table* reuse_of; + + uint8_t flag_byte; + + // Is this table reused by a TTC + bool IsReused() const; + }; + std::map<uint32_t, Table> tables; + std::vector<uint32_t> OutputOrderedTags() const; + + Table* FindTable(uint32_t tag); + const Table* FindTable(uint32_t tag) const; +}; + +// Accomodates both singular (OTF, TTF) and collection (TTC) fonts +struct FontCollection { + uint32_t flavor; + uint32_t header_version; + // (offset, first use of table*) pairs + std::map<uint32_t, Font::Table*> tables; + std::vector<Font> fonts; +}; + +// Parses the font from the given data. Returns false on parsing failure or +// buffer overflow. The font is valid only so long the input data pointer is +// valid. Does NOT support collections. +bool ReadFont(const uint8_t* data, size_t len, Font* font); + +// Parses the font from the given data. Returns false on parsing failure or +// buffer overflow. The font is valid only so long the input data pointer is +// valid. Supports collections. +bool ReadFontCollection(const uint8_t* data, size_t len, FontCollection* fonts); + +// Returns the file size of the font. +size_t FontFileSize(const Font& font); +size_t FontCollectionFileSize(const FontCollection& font); + +// Writes the font into the specified dst buffer. The dst_size should be the +// same as returned by FontFileSize(). Returns false upon buffer overflow (which +// should not happen if dst_size was computed by FontFileSize()). +bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size); +// Write the font at a specific offset +bool WriteFont(const Font& font, size_t* offset, uint8_t* dst, size_t dst_size); + +bool WriteFontCollection(const FontCollection& font_collection, uint8_t* dst, + size_t dst_size); + +// Returns the number of glyphs in the font. +// NOTE: Currently this works only for TrueType-flavored fonts, will return +// zero for CFF-flavored fonts. +int NumGlyphs(const Font& font); + +// Returns the index format of the font +int IndexFormat(const Font& font); + +// Sets *glyph_data and *glyph_size to point to the location of the glyph data +// with the given index. Returns false if the glyph is not found. +bool GetGlyphData(const Font& font, int glyph_index, + const uint8_t** glyph_data, size_t* glyph_size); + +// Removes the digital signature (DSIG) table +bool RemoveDigitalSignature(Font* font); + +} // namespace woff2 + +#endif // WOFF2_FONT_H_ |