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Diffstat (limited to 'vcl/source/fontsubset/ttcr.hxx')
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1 files changed, 220 insertions, 0 deletions
diff --git a/vcl/source/fontsubset/ttcr.hxx b/vcl/source/fontsubset/ttcr.hxx new file mode 100644 index 000000000..26298f78c --- /dev/null +++ b/vcl/source/fontsubset/ttcr.hxx @@ -0,0 +1,220 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +/** + * @file ttcr.hxx + * @brief TrueType font creator + */ + +#ifndef INCLUDED_VCL_SOURCE_FONTSUBSET_TTCR_HXX +#define INCLUDED_VCL_SOURCE_FONTSUBSET_TTCR_HXX + +#include <sft.hxx> + +namespace vcl +{ + struct TrueTypeCreator; + +/* TrueType data types */ + typedef struct { + sal_uInt16 aw; + sal_Int16 lsb; + } longHorMetrics; + +/* A generic base class for all TrueType tables */ + struct TrueTypeTable { + sal_uInt32 tag; /* table tag */ + sal_uInt8 *rawdata; /* raw data allocated by GetRawData_*() */ + void *data; /* table specific data */ + }; + +/** Error codes for most functions */ + enum TTCRErrCodes { + TTCR_OK, /**< no error */ + TTCR_ZEROGLYPHS, /**< At least one glyph should be defined */ + TTCR_UNKNOWN, /**< Unknown TrueType table */ + TTCR_NONAMES, /**< 'name' table does not contain any names */ + TTCR_NAMETOOLONG, /**< 'name' table is too long (string data > 64K) */ + TTCR_POSTFORMAT /**< unsupported format of a 'post' table */ + }; + +/** + * TrueTypeCreator constructor. + * Allocates all internal structures. + */ + void TrueTypeCreatorNewEmpty(sal_uInt32 tag, TrueTypeCreator **_this); + +/** + * Adds a TrueType table to the TrueType creator. + */ + void AddTable(TrueTypeCreator *_this, TrueTypeTable *table); + +/** + * Removes a TrueType table from the TrueType creator if it is stored there. + * It also calls a TrueTypeTable destructor. + * Note: all generic tables (with tag 0) will be removed if this function is + * called with the second argument of 0. + * @return value of SFErrCodes type + */ + void RemoveTable(TrueTypeCreator *_this, sal_uInt32 tag); + +/** + * Writes a TrueType font generated by the TrueTypeCreator to a segment of + * memory that this method allocates. When it is not needed anymore the caller + * is supposed to call free() on it. + * @return value of SFErrCodes type + */ + SFErrCodes StreamToMemory(TrueTypeCreator *_this, sal_uInt8 **ptr, sal_uInt32 *length); + +/** + * Writes a TrueType font generated by the TrueTypeCreator to a file + * @return value of SFErrCodes type + */ + SFErrCodes StreamToFile(TrueTypeCreator *_this, const char* fname); + +/** + * This function converts the data of a TrueType table to a raw array of bytes. + * It may allocates the memory for it and returns the size of the raw data in bytes. + * If memory is allocated it does not need to be freed by the caller of this function, + * since the pointer to it is stored in the TrueTypeTable and it is freed by the destructor + * @return TTCRErrCode + * + */ + + int GetRawData(TrueTypeTable *, sal_uInt8 **ptr, sal_uInt32 *len, sal_uInt32 *tag); + +/** + * + * Creates a new raw TrueType table. The difference between this constructor and + * TrueTypeTableNew_tag constructors is that the latter create structured tables + * while this constructor just copies memory pointed to by ptr to its buffer + * and stores its length. This constructor is suitable for data that is not + * supposed to be processed in any way, just written to the resulting TTF file. + */ + TrueTypeTable *TrueTypeTableNew(sal_uInt32 tag, + sal_uInt32 nbytes, + const sal_uInt8* ptr); + +/** + * Creates a new 'head' table for a TrueType font. + * Allocates memory for it. Since a lot of values in the 'head' table depend on the + * rest of the tables in the TrueType font this table should be the last one added + * to the font. + */ + TrueTypeTable *TrueTypeTableNew_head(sal_uInt32 fontRevision, + sal_uInt16 flags, + sal_uInt16 unitsPerEm, + const sal_uInt8 *created, + sal_uInt16 macStyle, + sal_uInt16 lowestRecPPEM, + sal_Int16 fontDirectionHint); + +/** + * Creates a new 'hhea' table for a TrueType font. + * Allocates memory for it and stores it in the hhea pointer. + */ + TrueTypeTable *TrueTypeTableNew_hhea(sal_Int16 ascender, + sal_Int16 descender, + sal_Int16 linegap, + sal_Int16 caretSlopeRise, + sal_Int16 caretSlopeRun); + +/** + * Creates a new empty 'loca' table for a TrueType font. + * + * INTERNAL: gets called only from ProcessTables(); + */ + TrueTypeTable *TrueTypeTableNew_loca(); + +/** + * Creates a new 'maxp' table based on an existing maxp table. + * If maxp is 0, a new empty maxp table is created + * size specifies the size of existing maxp table for + * error-checking purposes + */ + TrueTypeTable *TrueTypeTableNew_maxp( const sal_uInt8* maxp, int size); + +/** + * Creates a new empty 'glyf' table. + */ + TrueTypeTable *TrueTypeTableNew_glyf(); + +/** + * Creates a new empty 'cmap' table. + */ + TrueTypeTable *TrueTypeTableNew_cmap(); + +/** + * Creates a new 'name' table. If n != 0 the table gets populated by + * the Name Records stored in the nr array. This function allocates + * memory for its own copy of NameRecords, so nr array has to + * be explicitly deallocated when it is not needed. + */ + TrueTypeTable *TrueTypeTableNew_name(int n, NameRecord const *nr); + +/** + * Creates a new 'post' table of one of the supported formats + */ + TrueTypeTable *TrueTypeTableNew_post(sal_Int32 format, + sal_Int32 italicAngle, + sal_Int16 underlinePosition, + sal_Int16 underlineThickness, + sal_uInt32 isFixedPitch); + +// Table manipulation functions + +/** + * Add a character/glyph pair to a cmap table + */ + void cmapAdd(TrueTypeTable *, sal_uInt32 id, sal_uInt32 c, sal_uInt32 g); + +/** + * Add a glyph to a glyf table. + * + * @return glyphID of the glyph in the new font + * + * NOTE: This function does not duplicate GlyphData, so memory will be + * deallocated in the table destructor + */ + sal_uInt32 glyfAdd(TrueTypeTable *, GlyphData *glyphdata, TrueTypeFont *fnt); + +/** + * Query the number of glyphs currently stored in the 'glyf' table + * + */ + sal_uInt32 glyfCount(const TrueTypeTable *); + +} // namespace + +extern "C" +{ +/** + * Destructor for the TrueTypeTable object. + */ + void TrueTypeTableDispose(void *); + +/** + * TrueTypeCreator destructor. It calls destructors for all TrueTypeTables added to it. + */ + void TrueTypeCreatorDispose(vcl::TrueTypeCreator *_this); +} + +#endif // INCLUDED_VCL_SOURCE_FONTSUBSET_TTCR_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |