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 #include <tools/debug.hxx>
  21
  22 #include <osl/diagnose.h>
  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( FontSubsetInfo::NO_FONT)
  32     , mpInFontBytes( nullptr)
  33     , mnInByteLength( 0)
  34     , meInFontType( FontSubsetInfo::NO_FONT)
  35     , mpSftTTFont( nullptr)
  36     , mnReqFontTypeMask(0)
  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 bool FontSubsetInfo::LoadFont(
  51     FontSubsetInfo::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     return (mnInByteLength > 0);
  59 }
  60
  61 // prepare subsetting for fonts that are known to the SFT-parser
  62 bool FontSubsetInfo::LoadFont( vcl::TrueTypeFont* pSftTTFont )
  63 {
  64     SAL_WARN_IF( (mpInFontBytes != nullptr), "vcl", "Subset from SFT and from mapped font-file requested");
  65     mpSftTTFont = pSftTTFont;
  66     meInFontType = ANY_SFNT;
  67     return (mpSftTTFont == nullptr);
  68 }
  69
  70 bool FontSubsetInfo::CreateFontSubset(
  71     int nReqFontTypeMask,
  72     FILE* pOutFile, const char* pReqFontName,
  73     const sal_GlyphId* pReqGlyphIds, const sal_uInt8* pReqEncodedIds, int nReqGlyphCount,
  74     sal_Int32* pOutGlyphWidths)
  75 {
  76     // prepare request details needed by all underlying subsetters
  77     mnReqFontTypeMask = nReqFontTypeMask;
  78     mpOutFile       = pOutFile;
  79     mpReqFontName   = pReqFontName;
  80     mpReqGlyphIds   = pReqGlyphIds;
  81     mpReqEncodedIds = pReqEncodedIds;
  82     mnReqGlyphCount = nReqGlyphCount;
  83
  84     // TODO: move the glyphid/encid/notdef reshuffling from the callers to here
  85
  86     // dispatch to underlying subsetters
  87     bool bOK = false;
  88
  89     // TODO: better match available input-type to possible subset-types
  90     switch( meInFontType) {
  91     case SFNT_TTF:
  92     case SFNT_CFF:
  93     case ANY_SFNT:
  94         bOK = CreateFontSubsetFromSfnt( pOutGlyphWidths);
  95         break;
  96     case CFF_FONT:
  97         bOK = CreateFontSubsetFromCff( pOutGlyphWidths);
  98         break;
  99     case TYPE1_PFA:
 100     case TYPE1_PFB:
 101     case ANY_TYPE1:
 102         bOK = CreateFontSubsetFromType1( pOutGlyphWidths);
 103         break;
 104         // fall through
 105     case NO_FONT:
 106         // fall through
 107     default:
 108         OSL_FAIL( "unhandled type in CreateFontSubset()");
 109         break;
 110     }
 111
 112     return bOK;
 113 }
 114
 115 // TODO: move function to sft.cxx to replace dummy implementation
 116 bool FontSubsetInfo::CreateFontSubsetFromSfnt( sal_Int32* pOutGlyphWidths )
 117 {
 118     // handle SFNT_CFF fonts
 119     int nCffLength = 0;
 120     const sal_uInt8* pCffBytes = nullptr;
 121     if( GetSfntTable( mpSftTTFont, O_CFF, &pCffBytes, &nCffLength))
 122     {
 123         LoadFont( CFF_FONT, pCffBytes, nCffLength);
 124         const bool bOK = CreateFontSubsetFromCff( pOutGlyphWidths);
 125         return bOK;
 126     }
 127
 128     // handle SFNT_TTF fonts
 129     // by forwarding the subset request to AG's sft subsetter
 130 #if 1 // TODO: remove conversion tp 16bit glyphids when sft-subsetter has been updated
 131     sal_uInt16 aShortGlyphIds[256];
 132     for( int i = 0; i < mnReqGlyphCount; ++i)
 133         aShortGlyphIds[i] = (sal_uInt16)mpReqGlyphIds[i];
 134     // remove const_cast when sft-subsetter is const-correct
 135     sal_uInt8* pEncArray = const_cast<sal_uInt8*>( mpReqEncodedIds );
 136 #endif
 137     int nSFTErr = vcl::SF_BADARG;
 138     if( (mnReqFontTypeMask & TYPE42_FONT) != 0 )
 139     {
 140         nSFTErr = CreateT42FromTTGlyphs( mpSftTTFont, mpOutFile, mpReqFontName,
 141             aShortGlyphIds, pEncArray, mnReqGlyphCount );
 142     }
 143     else if( (mnReqFontTypeMask & TYPE3_FONT) != 0 )
 144     {
 145         nSFTErr = CreateT3FromTTGlyphs( mpSftTTFont, mpOutFile, mpReqFontName,
 146             aShortGlyphIds, pEncArray, mnReqGlyphCount,
 147                     0 /* 0 = horizontal, 1 = vertical */ );
 148     }
 149     else if( (mnReqFontTypeMask & SFNT_TTF) != 0 )
 150     {
 151         // TODO: use CreateTTFromTTGlyphs()
 152         // TODO: move functionality from callers here
 153     }
 154
 155     return (nSFTErr != vcl::SF_OK);
 156 }
 157
 158 // TODO: replace dummy implementation
 159 bool FontSubsetInfo::CreateFontSubsetFromType1( sal_Int32* pOutGlyphWidths)
 160 {
 161     (void)pOutGlyphWidths;
 162     fprintf(stderr,"CreateFontSubsetFromType1: replace dummy implementation\n");
 163     return false;
 164 }
 165
 166 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */