KoFontLibraryResourceUtils.h

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/*
 *  SPDX-FileCopyrightText: 2022 Dmitry Kazakov <dimula73@gmail.com>
 *  SPDX-FileCopyrightText: 2022 L. E. Segovia <amy@amyspark.me>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
#ifndef KOFONTLIBRARYRESOURCEUTILS_H
#define KOFONTLIBRARYRESOURCEUTILS_H
 
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_MULTIPLE_MASTERS_H
#include <fontconfig/fontconfig.h>
 
#include <hb-ft.h>
#include <hb-ot.h>
#include <hb.h>
 
#include <QSharedPointer>
 
#include <kis_debug.h>
 
namespace detail {
 
template <typename T, int (*P)(T *)>
void checkCStyleResultWrapper(T *ptr)
{
    const int result = P(ptr);
    if (result != 0) {
        qWarning() << "WARNING: failed to release a library resource";
#ifdef __GNUC__
        qWarning() << "    source:" << __PRETTY_FUNCTION__;
#endif
    }
}
 
}
 
template<typename T, void (*P)(T *)>
struct KisLibraryResourcePointer : private QSharedPointer<T> {
public:
    KisLibraryResourcePointer()
        : QSharedPointer<T>(nullptr)
    {
    }
 
    KisLibraryResourcePointer(T *ptr)
        : QSharedPointer<T>(ptr, ptr ? P : &KisLibraryResourcePointer::noDestroy)
    {
    }
 
    using QSharedPointer<T>::operator->;
 
    void reset(T *ptr) {
        QSharedPointer<T>::reset(ptr, ptr ? P : &KisLibraryResourcePointer::noDestroy);
    }
 
    void reset() {
        QSharedPointer<T>::reset();
    }
 
    auto data() const
    {
        return this->get();
    }
 
private:
    static void noDestroy(T *ptr) {
        Q_UNUSED(ptr);
    }
};
 
template<typename T, int (*P)(T *)>
using KisLibraryResourcePointerWithSanityCheck = KisLibraryResourcePointer<T, detail::checkCStyleResultWrapper<T, P>>;
 
 
using FcConfigSP = KisLibraryResourcePointer<FcConfig, FcConfigDestroy>;
using FcCharSetSP = KisLibraryResourcePointer<FcCharSet, FcCharSetDestroy>;
using FcPatternSP = KisLibraryResourcePointer<FcPattern, FcPatternDestroy>;
using FcFontSetSP = KisLibraryResourcePointer<FcFontSet, FcFontSetDestroy>;
 
using FT_LibrarySP =
    KisLibraryResourcePointerWithSanityCheck<std::remove_pointer_t<FT_Library>,
                                             FT_Done_FreeType>;
using FT_FaceSP = KisLibraryResourcePointerWithSanityCheck<std::remove_pointer_t<FT_Face>,
                                                           FT_Done_Face>;
 
using hb_font_t_sp = KisLibraryResourcePointer<hb_font_t, hb_font_destroy>;
using hb_face_t_sp = KisLibraryResourcePointer<hb_face_t, hb_face_destroy>;
using hb_set_t_sp =KisLibraryResourcePointer<hb_set_t, hb_set_destroy>;
using hb_blob_t_sp = KisLibraryResourcePointer<hb_blob_t, hb_blob_destroy>;
 
#endif // KOFONTLIBRARYRESOURCEUTILS_H