vcl/inc/fontsubset.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_VCL_INC_FONTSUBSET_HXX
  21 #define INCLUDED_VCL_INC_FONTSUBSET_HXX
  22
  23 #include <rtl/ustring.hxx>
  24 #include <tools/gen.hxx>
  25 #include <o3tl/typed_flags_set.hxx>
  26
  27 #include "sallayout.hxx"
  28
  29 namespace vcl { struct TrueTypeFont; }         ///< SFT's idea of a TTF font
  30
  31 enum class FontType {
  32     NO_FONT     = 0,
  33     SFNT_TTF    = 1<<1,                     ///< SFNT container with TrueType glyphs
  34     SFNT_CFF    = 1<<2,                     ///< SFNT container with CFF-container
  35     TYPE1_PFA   = 1<<3,                     ///< PSType1 Postscript Font Ascii
  36     TYPE1_PFB   = 1<<4,                     ///< PSType1 Postscript Font Binary
  37     CFF_FONT    = 1<<5,                     ///< CFF-container with PSType2 glyphs
  38     TYPE3_FONT  = 1<<6,                     ///< PSType3 Postscript font
  39     TYPE42_FONT = 1<<7,                     ///< PSType42 wrapper for an SFNT_TTF
  40     ANY_SFNT    = SFNT_TTF | SFNT_CFF,
  41     ANY_TYPE1   = TYPE1_PFA | TYPE1_PFB
  42 };
  43 namespace o3tl {
  44     template<> struct typed_flags<FontType> : is_typed_flags<FontType, (1<<8)-1> {};
  45 }
  46
  47 class FontSubsetInfo final
  48 {
  49 public:
  50     explicit    FontSubsetInfo();
  51                 ~FontSubsetInfo();
  52
  53     void        LoadFont( FontType eInFontType,
  54                     const unsigned char* pFontBytes, int nByteLength );
  55     void        LoadFont( vcl::TrueTypeFont* pSftTrueTypeFont );
  56
  57     bool        CreateFontSubset( FontType nOutFontTypeMask,
  58                     FILE* pOutFile, const char* pOutFontName,
  59                     const sal_GlyphId* pGlyphIds, const sal_uInt8* pEncodedIds,
  60                     int nReqGlyphCount, sal_Int32* pOutGlyphWidths = nullptr );
  61
  62 public: // TODO: make subsetter results private and provide accessor methods instead
  63         // subsetter-provided subset details needed by e.g. Postscript or PDF
  64     OUString                m_aPSName;
  65     int                     m_nAscent;          ///< all metrics in PS font units
  66     int                     m_nDescent;
  67     int                     m_nCapHeight;
  68     tools::Rectangle               m_aFontBBox;
  69     FontType                m_nFontType;        ///< font-type of subset result
  70
  71 private:
  72     // input-font-specific details
  73     unsigned const char*    mpInFontBytes;
  74     int                     mnInByteLength;
  75     FontType                meInFontType;       ///< allowed mask of input font-types
  76     vcl::TrueTypeFont*      mpSftTTFont;
  77
  78     // subset-request details
  79     FontType                mnReqFontTypeMask;  ///< allowed subset-target font types
  80     FILE*                   mpOutFile;
  81     const char*             mpReqFontName;
  82     const sal_GlyphId*      mpReqGlyphIds;
  83     const sal_uInt8*        mpReqEncodedIds;
  84     int                     mnReqGlyphCount;
  85
  86     bool    CreateFontSubsetFromCff( sal_Int32* pOutGlyphWidths );
  87     bool    CreateFontSubsetFromSfnt( sal_Int32* pOutGlyphWidths );
  88     static bool CreateFontSubsetFromType1( const sal_Int32* pOutGlyphWidths );
  89 };
  90
  91 #endif // INCLUDED_VCL_INC_FONTSUBSET_HXX
  92
  93 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */