vcl/source/fontsubset/fontsubset.cxx

   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
  21 #include <osl/diagnose.h>
  22 #include <sal/log.hxx>
  23
  24 #include <fontsubset.hxx>
  25 #include <sft.hxx>
  26
  27 FontSubsetInfo::FontSubsetInfo()
  28     : m_nAscent( 0)
  29     , m_nDescent( 0)
  30     , m_nCapHeight( 0)
  31     , m_nFontType( FontType::NO_FONT)
  32     , mpInFontBytes( nullptr)
  33     , mnInByteLength( 0)
  34     , meInFontType( FontType::NO_FONT)
  35     , mpSftTTFont( nullptr)
  36     , mnReqFontTypeMask( FontType::NO_FONT )
  37     , mpOutFile(nullptr)
  38     , mpReqFontName(nullptr)
  39     , mpReqGlyphIds(nullptr)
  40     , mpReqEncodedIds(nullptr)
  41     , mnReqGlyphCount(0)
  42 {
  43 }
  44
  45 FontSubsetInfo::~FontSubsetInfo()
  46 {
  47 }
  48
  49 // prepare subsetting for fonts where the input font file is mapped
  50 void FontSubsetInfo::LoadFont(
  51     FontType eInFontType,
  52     const unsigned char* pInFontBytes, int nInByteLength)
  53 {
  54     SAL_WARN_IF( (mpSftTTFont != nullptr), "vcl", "Subset from SFT and from mapped font-file requested");
  55     meInFontType = eInFontType;
  56     mpInFontBytes = pInFontBytes;
  57     mnInByteLength = nInByteLength;
  58 }
  59
  60 // prepare subsetting for fonts that are known to the SFT-parser
  61 void FontSubsetInfo::LoadFont( vcl::TrueTypeFont* pSftTTFont )
  62 {
  63     SAL_WARN_IF( (mpInFontBytes != nullptr), "vcl", "Subset from SFT and from mapped font-file requested");
  64     mpSftTTFont = pSftTTFont;
  65     meInFontType = FontType::ANY_SFNT;
  66 }
  67
  68 bool FontSubsetInfo::CreateFontSubset(
  69     FontType nReqFontTypeMask,
  70     FILE* pOutFile, const char* pReqFontName,
  71     const sal_GlyphId* pReqGlyphIds, const sal_uInt8* pReqEncodedIds, int nReqGlyphCount,
  72     sal_Int32* pOutGlyphWidths)
  73 {
  74     // prepare request details needed by all underlying subsetters
  75     mnReqFontTypeMask = nReqFontTypeMask;
  76     mpOutFile       = pOutFile;
  77     mpReqFontName   = pReqFontName;
  78     mpReqGlyphIds   = pReqGlyphIds;
  79     mpReqEncodedIds = pReqEncodedIds;
  80     mnReqGlyphCount = nReqGlyphCount;
  81
  82     // TODO: move the glyphid/encid/notdef reshuffling from the callers to here
  83
  84     // dispatch to underlying subsetters
  85     bool bOK = false;
  86
  87     // TODO: better match available input-type to possible subset-types
  88     switch( meInFontType) {
  89     case FontType::SFNT_TTF:
  90     case FontType::SFNT_CFF:
  91     case FontType::ANY_SFNT:
  92         bOK = CreateFontSubsetFromSfnt( pOutGlyphWidths);
  93         break;
  94     case FontType::CFF_FONT:
  95         bOK = CreateFontSubsetFromCff( pOutGlyphWidths);
  96         break;
  97     case FontType::TYPE1_PFA:
  98     case FontType::TYPE1_PFB:
  99     case FontType::ANY_TYPE1:
 100         bOK = CreateFontSubsetFromType1( pOutGlyphWidths);
 101         break;
 102     case FontType::NO_FONT:
 103     default:
 104         OSL_FAIL( "unhandled type in CreateFontSubset()");
 105         break;
 106     }
 107
 108     return bOK;
 109 }
 110
 111 // TODO: move function to sft.cxx to replace dummy implementation
 112 bool FontSubsetInfo::CreateFontSubsetFromSfnt( sal_Int32* pOutGlyphWidths )
 113 {
 114     // handle SFNT_CFF fonts
 115     sal_uInt32 nCffLength = 0;
 116     const sal_uInt8* pCffBytes = mpSftTTFont->table(vcl::O_CFF, nCffLength);
 117     if (pCffBytes)
 118     {
 119         LoadFont( FontType::CFF_FONT, pCffBytes, nCffLength);
 120         const bool bOK = CreateFontSubsetFromCff( pOutGlyphWidths);
 121         return bOK;
 122     }
 123
 124     // handle SFNT_TTF fonts
 125     // by forwarding the subset request to AG's sft subsetter
 126 #if 1 // TODO: remove conversion tp 16bit glyphids when sft-subsetter has been updated
 127     std::vector<sal_uInt16> aShortGlyphIds;
 128     aShortGlyphIds.reserve(mnReqGlyphCount);
 129     for (int i = 0; i < mnReqGlyphCount; ++i)
 130         aShortGlyphIds.push_back(static_cast<sal_uInt16>(mpReqGlyphIds[i]));
 131     // remove const_cast when sft-subsetter is const-correct
 132     sal_uInt8* pEncArray = const_cast<sal_uInt8*>( mpReqEncodedIds );
 133 #endif
 134     vcl::SFErrCodes nSFTErr = vcl::SFErrCodes::BadArg;
 135     if( mnReqFontTypeMask & FontType::TYPE42_FONT )
 136     {
 137         nSFTErr = CreateT42FromTTGlyphs( mpSftTTFont, mpOutFile, mpReqFontName,
 138             aShortGlyphIds.data(), pEncArray, mnReqGlyphCount );
 139     }
 140     else if( mnReqFontTypeMask & FontType::TYPE3_FONT )
 141     {
 142         nSFTErr = CreateT3FromTTGlyphs( mpSftTTFont, mpOutFile, mpReqFontName,
 143             aShortGlyphIds.data(), pEncArray, mnReqGlyphCount,
 144                     0 /* 0 = horizontal, 1 = vertical */ );
 145     }
 146     else if( mnReqFontTypeMask & FontType::SFNT_TTF )
 147     {
 148         // TODO: use CreateTTFromTTGlyphs()
 149         // TODO: move functionality from callers here
 150     }
 151
 152     return (nSFTErr != vcl::SFErrCodes::Ok);
 153 }
 154
 155 // TODO: replace dummy implementation
 156 bool FontSubsetInfo::CreateFontSubsetFromType1( const sal_Int32* /*pOutGlyphWidths*/)
 157 {
 158     SAL_WARN("vcl.fonts",
 159             "CreateFontSubsetFromType1: replace dummy implementation.");
 160     return false;
 161 }
 162
 163 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */