File: SplashFTFontEngine.cc

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//========================================================================
//
// SplashFTFontEngine.cc
//
//========================================================================

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2006 Takashi Iwai <tiwai@suse.de>
// Copyright (C) 2009, 2011, 2012 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2009 Petr Gajdos <pgajdos@novell.com>
// Copyright (C) 2011 Andreas Hartmetz <ahartmetz@gmail.com>
// Copyright (C) 2017 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2019 Christian Persch <chpe@src.gnome.org>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================

#include <config.h>

#include <cstdio>
#ifdef HAVE_UNISTD_H
#    include <unistd.h>
#endif
#include "goo/gmem.h"
#include "goo/GooString.h"
#include "goo/gfile.h"
#include "fofi/FoFiTrueType.h"
#include "fofi/FoFiType1C.h"
#include "SplashFTFontFile.h"
#include "SplashFTFontEngine.h"

//------------------------------------------------------------------------
// SplashFTFontEngine
//------------------------------------------------------------------------

SplashFTFontEngine::SplashFTFontEngine(bool aaA, bool enableFreeTypeHintingA, bool enableSlightHintingA, FT_Library libA)
{
    FT_Int major, minor, patch;

    aa = aaA;
    enableFreeTypeHinting = enableFreeTypeHintingA;
    enableSlightHinting = enableSlightHintingA;
    lib = libA;

    // as of FT 2.1.8, CID fonts are indexed by CID instead of GID
    FT_Library_Version(lib, &major, &minor, &patch);
    useCIDs = major > 2 || (major == 2 && (minor > 1 || (minor == 1 && patch > 7)));
}

SplashFTFontEngine *SplashFTFontEngine::init(bool aaA, bool enableFreeTypeHintingA, bool enableSlightHintingA)
{
    FT_Library libA;

    if (FT_Init_FreeType(&libA)) {
        return nullptr;
    }
    return new SplashFTFontEngine(aaA, enableFreeTypeHintingA, enableSlightHintingA, libA);
}

SplashFTFontEngine::~SplashFTFontEngine()
{
    FT_Done_FreeType(lib);
}

SplashFontFile *SplashFTFontEngine::loadType1Font(SplashFontFileID *idA, SplashFontSrc *src, const char **enc)
{
    return SplashFTFontFile::loadType1Font(this, idA, src, enc);
}

SplashFontFile *SplashFTFontEngine::loadType1CFont(SplashFontFileID *idA, SplashFontSrc *src, const char **enc)
{
    return SplashFTFontFile::loadType1Font(this, idA, src, enc);
}

SplashFontFile *SplashFTFontEngine::loadOpenTypeT1CFont(SplashFontFileID *idA, SplashFontSrc *src, const char **enc)
{
    return SplashFTFontFile::loadType1Font(this, idA, src, enc);
}

SplashFontFile *SplashFTFontEngine::loadCIDFont(SplashFontFileID *idA, SplashFontSrc *src)
{
    FoFiType1C *ff;
    int *cidToGIDMap;
    int nCIDs;
    SplashFontFile *ret;

    // check for a CFF font
    if (useCIDs) {
        cidToGIDMap = nullptr;
        nCIDs = 0;
    } else {
        if (src->isFile) {
            ff = FoFiType1C::load(src->fileName->c_str());
        } else {
            ff = FoFiType1C::make(src->buf, src->bufLen);
        }
        if (ff) {
            cidToGIDMap = ff->getCIDToGIDMap(&nCIDs);
            delete ff;
        } else {
            cidToGIDMap = nullptr;
            nCIDs = 0;
        }
    }
    ret = SplashFTFontFile::loadCIDFont(this, idA, src, cidToGIDMap, nCIDs);
    if (!ret) {
        gfree(cidToGIDMap);
    }
    return ret;
}

SplashFontFile *SplashFTFontEngine::loadOpenTypeCFFFont(SplashFontFileID *idA, SplashFontSrc *src, int *codeToGID, int codeToGIDLen)
{
    FoFiTrueType *ff;
    int *cidToGIDMap;
    int nCIDs;
    SplashFontFile *ret;

    cidToGIDMap = nullptr;
    nCIDs = 0;
    if (!codeToGID) {
        if (!useCIDs) {
            if (src->isFile) {
                ff = FoFiTrueType::load(src->fileName->c_str());
            } else {
                ff = FoFiTrueType::make(src->buf, src->bufLen);
            }
            if (ff) {
                if (ff->isOpenTypeCFF()) {
                    cidToGIDMap = ff->getCIDToGIDMap(&nCIDs);
                }
                delete ff;
            }
        }
    }
    ret = SplashFTFontFile::loadCIDFont(this, idA, src, codeToGID ? codeToGID : cidToGIDMap, codeToGID ? codeToGIDLen : nCIDs);
    if (!ret) {
        gfree(cidToGIDMap);
    }
    return ret;
}

SplashFontFile *SplashFTFontEngine::loadTrueTypeFont(SplashFontFileID *idA, SplashFontSrc *src, int *codeToGID, int codeToGIDLen, int faceIndex)
{
    SplashFontFile *ret;
    ret = SplashFTFontFile::loadTrueTypeFont(this, idA, src, codeToGID, codeToGIDLen, faceIndex);
    return ret;
}