File: SplashFontEngine.cc

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//========================================================================
//
// SplashFontEngine.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 Petr Gajdos <pgajdos@novell.com>
// Copyright (C) 2009 Kovid Goyal <kovid@kovidgoyal.net>
// Copyright (C) 2009 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2011 Andreas Hartmetz <ahartmetz@gmail.com>
// Copyright (C) 2013 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2015 Dmytro Morgun <lztoad@gmail.com>
// Copyright (C) 2017 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2018 Oliver Sander <oliver.sander@tu-dresden.de>
// 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 <cstdlib>
#include <cstdio>
#ifdef HAVE_UNISTD_H
#    include <unistd.h>
#endif
#include <algorithm>

#include "goo/gmem.h"
#include "goo/GooString.h"
#include "SplashMath.h"
#include "SplashFTFontEngine.h"
#include "SplashFontFile.h"
#include "SplashFontFileID.h"
#include "SplashFont.h"
#include "SplashFontEngine.h"

//------------------------------------------------------------------------
// SplashFontEngine
//------------------------------------------------------------------------

SplashFontEngine::SplashFontEngine(bool enableFreeType, bool enableFreeTypeHinting, bool enableSlightHinting, bool aa)
{
    std::fill(fontCache.begin(), fontCache.end(), nullptr);

    if (enableFreeType) {
        ftEngine = SplashFTFontEngine::init(aa, enableFreeTypeHinting, enableSlightHinting);
    } else {
        ftEngine = nullptr;
    }
}

SplashFontEngine::~SplashFontEngine()
{
    for (auto font : fontCache) {
        delete font;
    }

    if (ftEngine) {
        delete ftEngine;
    }
}

SplashFontFile *SplashFontEngine::getFontFile(SplashFontFileID *id)
{
    for (auto font : fontCache) {
        if (font) {
            SplashFontFile *fontFile = font->getFontFile();
            if (fontFile && fontFile->getID()->matches(id)) {
                return fontFile;
            }
        }
    }
    return nullptr;
}

SplashFontFile *SplashFontEngine::loadType1Font(SplashFontFileID *idA, SplashFontSrc *src, const char **enc)
{
    SplashFontFile *fontFile = nullptr;

    if (ftEngine) {
        fontFile = ftEngine->loadType1Font(idA, src, enc);
    }

    // delete the (temporary) font file -- with Unix hard link
    // semantics, this will remove the last link; otherwise it will
    // return an error, leaving the file to be deleted later (if
    // loadXYZFont failed, the file will always be deleted)
    if (src->isFile)
        src->unref();

    return fontFile;
}

SplashFontFile *SplashFontEngine::loadType1CFont(SplashFontFileID *idA, SplashFontSrc *src, const char **enc)
{
    SplashFontFile *fontFile = nullptr;

    if (ftEngine) {
        fontFile = ftEngine->loadType1CFont(idA, src, enc);
    }

    // delete the (temporary) font file -- with Unix hard link
    // semantics, this will remove the last link; otherwise it will
    // return an error, leaving the file to be deleted later (if
    // loadXYZFont failed, the file will always be deleted)
    if (src->isFile)
        src->unref();

    return fontFile;
}

SplashFontFile *SplashFontEngine::loadOpenTypeT1CFont(SplashFontFileID *idA, SplashFontSrc *src, const char **enc)
{
    SplashFontFile *fontFile = nullptr;

    if (ftEngine) {
        fontFile = ftEngine->loadOpenTypeT1CFont(idA, src, enc);
    }

    // delete the (temporary) font file -- with Unix hard link
    // semantics, this will remove the last link; otherwise it will
    // return an error, leaving the file to be deleted later (if
    // loadXYZFont failed, the file will always be deleted)
    if (src->isFile)
        src->unref();

    return fontFile;
}

SplashFontFile *SplashFontEngine::loadCIDFont(SplashFontFileID *idA, SplashFontSrc *src)
{
    SplashFontFile *fontFile = nullptr;

    if (ftEngine) {
        fontFile = ftEngine->loadCIDFont(idA, src);
    }

    // delete the (temporary) font file -- with Unix hard link
    // semantics, this will remove the last link; otherwise it will
    // return an error, leaving the file to be deleted later (if
    // loadXYZFont failed, the file will always be deleted)
    if (src->isFile)
        src->unref();

    return fontFile;
}

SplashFontFile *SplashFontEngine::loadOpenTypeCFFFont(SplashFontFileID *idA, SplashFontSrc *src, int *codeToGID, int codeToGIDLen)
{
    SplashFontFile *fontFile = nullptr;

    if (ftEngine) {
        fontFile = ftEngine->loadOpenTypeCFFFont(idA, src, codeToGID, codeToGIDLen);
    }

    // delete the (temporary) font file -- with Unix hard link
    // semantics, this will remove the last link; otherwise it will
    // return an error, leaving the file to be deleted later (if
    // loadXYZFont failed, the file will always be deleted)
    if (src->isFile)
        src->unref();

    return fontFile;
}

SplashFontFile *SplashFontEngine::loadTrueTypeFont(SplashFontFileID *idA, SplashFontSrc *src, int *codeToGID, int codeToGIDLen, int faceIndex)
{
    SplashFontFile *fontFile = nullptr;

    if (ftEngine) {
        fontFile = ftEngine->loadTrueTypeFont(idA, src, codeToGID, codeToGIDLen, faceIndex);
    }

    if (!fontFile) {
        gfree(codeToGID);
    }

    // delete the (temporary) font file -- with Unix hard link
    // semantics, this will remove the last link; otherwise it will
    // return an error, leaving the file to be deleted later (if
    // loadXYZFont failed, the file will always be deleted)
    if (src->isFile)
        src->unref();

    return fontFile;
}

bool SplashFontEngine::getAA()
{
    return (ftEngine == nullptr) ? false : ftEngine->getAA();
}

void SplashFontEngine::setAA(bool aa)
{
    if (ftEngine != nullptr) {
        ftEngine->setAA(aa);
    }
}

SplashFont *SplashFontEngine::getFont(SplashFontFile *fontFile, const SplashCoord *textMat, const SplashCoord *ctm)
{
    SplashCoord mat[4];

    mat[0] = textMat[0] * ctm[0] + textMat[1] * ctm[2];
    mat[1] = -(textMat[0] * ctm[1] + textMat[1] * ctm[3]);
    mat[2] = textMat[2] * ctm[0] + textMat[3] * ctm[2];
    mat[3] = -(textMat[2] * ctm[1] + textMat[3] * ctm[3]);
    if (!splashCheckDet(mat[0], mat[1], mat[2], mat[3], 0.01)) {
        // avoid a singular (or close-to-singular) matrix
        mat[0] = 0.01;
        mat[1] = 0;
        mat[2] = 0;
        mat[3] = 0.01;
    }

    // Try to find the font in the cache
    auto fontIt = std::find_if(fontCache.begin(), fontCache.end(), [&](const SplashFont *font) { return font && font->matches(fontFile, mat, textMat); });

    // The requested font has been found in the cache
    if (fontIt != fontCache.end()) {
        std::rotate(fontCache.begin(), fontIt, fontIt + 1);
        return fontCache[0];
    }

    // The requested font has not been found in the cache
    auto newFont = fontFile->makeFont(mat, textMat);
    if (fontCache.back()) {
        delete fontCache.back();
    }
    std::rotate(fontCache.begin(), fontCache.end() - 1, fontCache.end());

    fontCache[0] = newFont;
    return fontCache[0];
}