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 #pragma once
  21
  22 #include <rtl/ustring.hxx>
  23 #include <tools/gen.hxx>
  24 #include <o3tl/typed_flags_set.hxx>
  25
  26 #include <vcl/dllapi.h>
  27
  28 #include "glyphid.hxx"
  29
  30 namespace vcl { class TrueTypeFont; } ///< SFT's idea of a TTF font
  31 class SvStream;
  32
  33 enum class FontType {
  34     NO_FONT     = 0,
  35     SFNT_TTF    = 1<<1,                     ///< SFNT container with TrueType glyphs
  36     SFNT_CFF    = 1<<2,                     ///< SFNT container with CFF-container
  37     TYPE1_PFA   = 1<<3,                     ///< PSType1 Postscript Font Ascii
  38     TYPE1_PFB   = 1<<4,                     ///< PSType1 Postscript Font Binary
  39     CFF_FONT    = 1<<5,                     ///< CFF-container with PSType2 glyphs
  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 VCL_DLLPUBLIC FontSubsetInfo final
  48 {
  49 public:
  50     SAL_DLLPRIVATE explicit FontSubsetInfo();
  51     SAL_DLLPRIVATE ~FontSubsetInfo();
  52
  53     SAL_DLLPRIVATE void LoadFont( FontType eInFontType,
  54                     const unsigned char* pFontBytes, int nByteLength );
  55
  56     SAL_DLLPRIVATE bool CreateFontSubset( FontType nOutFontTypeMask,
  57                     SvStream* pOutFile,
  58                     const sal_GlyphId* pGlyphIds, const sal_uInt8* pEncodedIds,
  59                     int nReqGlyphCount);
  60
  61 public: // TODO: make subsetter results private and provide accessor methods instead
  62         // subsetter-provided subset details needed by e.g. Postscript or PDF
  63     OUString                m_aPSName;
  64     int                     m_nAscent;          ///< all metrics in PS font units
  65     int                     m_nDescent;
  66     int                     m_nCapHeight;
  67     tools::Rectangle               m_aFontBBox;
  68     FontType                m_nFontType;        ///< font-type of subset result
  69     bool                    m_bFilled;
  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
  77     // subset-request details
  78     FontType                mnReqFontTypeMask;  ///< allowed subset-target font types
  79     SvStream*               mpOutFile;
  80     OString                 maReqFontName;
  81     const sal_GlyphId*      mpReqGlyphIds;
  82     const sal_uInt8*        mpReqEncodedIds;
  83     int                     mnReqGlyphCount;
  84
  85     SAL_DLLPRIVATE bool CreateFontSubsetFromCff();
  86 };
  87
  88 int VCL_DLLPUBLIC TestFontSubset(const void* data, sal_uInt32 size);
  89
  90 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */