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 <vcl/dllapi.h>
  28
  29 #include "glyphid.hxx"
  30
  31 namespace vcl { class TrueTypeFont; } ///< SFT's idea of a TTF font
  32 class SvStream;
  33
  34 enum class FontType {
  35     NO_FONT     = 0,
  36     SFNT_TTF    = 1<<1,                     ///< SFNT container with TrueType glyphs
  37     SFNT_CFF    = 1<<2,                     ///< SFNT container with CFF-container
  38     TYPE1_PFA   = 1<<3,                     ///< PSType1 Postscript Font Ascii
  39     TYPE1_PFB   = 1<<4,                     ///< PSType1 Postscript Font Binary
  40     CFF_FONT    = 1<<5,                     ///< CFF-container with PSType2 glyphs
  41     TYPE3_FONT  = 1<<6,                     ///< PSType3 Postscript font
  42     TYPE42_FONT = 1<<7,                     ///< PSType42 wrapper for an SFNT_TTF
  43     ANY_SFNT    = SFNT_TTF | SFNT_CFF,
  44     ANY_TYPE1   = TYPE1_PFA | TYPE1_PFB
  45 };
  46 namespace o3tl {
  47     template<> struct typed_flags<FontType> : is_typed_flags<FontType, (1<<8)-1> {};
  48 }
  49
  50 class VCL_DLLPUBLIC FontSubsetInfo final
  51 {
  52 public:
  53     explicit    FontSubsetInfo();
  54                 ~FontSubsetInfo();
  55
  56     void        LoadFont( FontType eInFontType,
  57                     const unsigned char* pFontBytes, int nByteLength );
  58     void        LoadFont( vcl::TrueTypeFont* pSftTrueTypeFont );
  59
  60     bool        CreateFontSubset( FontType nOutFontTypeMask,
  61                     SvStream* pOutFile, const char* pOutFontName,
  62                     const sal_GlyphId* pGlyphIds, const sal_uInt8* pEncodedIds,
  63                     int nReqGlyphCount);
  64
  65 public: // TODO: make subsetter results private and provide accessor methods instead
  66         // subsetter-provided subset details needed by e.g. Postscript or PDF
  67     OUString                m_aPSName;
  68     int                     m_nAscent;          ///< all metrics in PS font units
  69     int                     m_nDescent;
  70     int                     m_nCapHeight;
  71     tools::Rectangle               m_aFontBBox;
  72     FontType                m_nFontType;        ///< font-type of subset result
  73     bool                    m_bFilled;
  74
  75 private:
  76     // input-font-specific details
  77     unsigned const char*    mpInFontBytes;
  78     int                     mnInByteLength;
  79     FontType                meInFontType;       ///< allowed mask of input font-types
  80     vcl::TrueTypeFont*      mpSftTTFont;
  81
  82     // subset-request details
  83     FontType                mnReqFontTypeMask;  ///< allowed subset-target font types
  84     SvStream*               mpOutFile;
  85     const char*             mpReqFontName;
  86     const sal_GlyphId*      mpReqGlyphIds;
  87     const sal_uInt8*        mpReqEncodedIds;
  88     int                     mnReqGlyphCount;
  89
  90     bool    CreateFontSubsetFromCff();
  91     bool    CreateFontSubsetFromSfnt();
  92 };
  93
  94 int VCL_DLLPUBLIC TestFontSubset(const void* data, sal_uInt32 size);
  95
  96 #endif // INCLUDED_VCL_INC_FONTSUBSET_HXX
  97
  98 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */