harfbuzz/src/graphite2/src/gr_face.cpp

// SPDX-License-Identifier: MIT
// Copyright 2010, SIL International, All rights reserved.

#include "graphite2/Font.h"
#include "inc/Face.h"
#include "inc/FileFace.h"
#include "inc/GlyphCache.h"
#include "inc/CmapCache.h"
#include "inc/Silf.h"
#include "inc/json.h"

using namespace graphite2;

#if !defined GRAPHITE2_NTRACING
extern json *global_log;
#endif

namespace
{
    bool load_face(Face & face, unsigned int options)
    {
#ifdef GRAPHITE2_TELEMETRY
        telemetry::category _misc_cat(face.tele.misc);
#endif
        Face::Table silf(face, Tag::Silf, 0x00050000);
        if (!silf)
            return false;

        if (!face.readGlyphs(options))
            return false;

        if (silf)
        {
            if (!face.readFeatures() || !face.readGraphite(silf))
            {
#if !defined GRAPHITE2_NTRACING
                if (global_log)
                {
                    *global_log << json::object
                        << "type" << "fontload"
                        << "failure" << face.error()
                        << "context" << face.error_context()
                    << json::close;
                }
#endif
                return false;
            }
            else
                return true;
        }
        else
            return false;
    }

    inline
    uint32_t zeropad(const uint32_t x)
    {
        if (x == 0x20202020)                    return 0;
        if ((x & 0x00FFFFFF) == 0x00202020)     return x & 0xFF000000;
        if ((x & 0x0000FFFF) == 0x00002020)     return x & 0xFFFF0000;
        if ((x & 0x000000FF) == 0x00000020)     return x & 0xFFFFFF00;
        return x;
    }
}

extern "C" {

gr_face* gr_make_face_with_ops(const void* appFaceHandle/*non-NULL*/, const gr_face_ops *ops, unsigned int faceOptions)
                  //the appFaceHandle must stay alive all the time when the gr_face is alive. When finished with the gr_face, call destroy_face
{
    if (ops == 0)   return 0;

    Face *res = new Face(appFaceHandle, *ops);
    if (res && load_face(*res, faceOptions))
        return static_cast<gr_face *>(res);

    delete res;
    return 0;
}

gr_face* gr_make_face(const void* appFaceHandle/*non-NULL*/, gr_get_table_fn tablefn, unsigned int faceOptions)
{
    const gr_face_ops ops = {sizeof(gr_face_ops), tablefn, NULL};
    return gr_make_face_with_ops(appFaceHandle, &ops, faceOptions);
}


gr_face* gr_make_face_with_seg_cache_and_ops(const void* appFaceHandle/*non-NULL*/, const gr_face_ops *ops, unsigned int , unsigned int faceOptions)
{
  return gr_make_face_with_ops(appFaceHandle, ops, faceOptions);
}

gr_face* gr_make_face_with_seg_cache(const void* appFaceHandle/*non-NULL*/, gr_get_table_fn tablefn, unsigned int, unsigned int faceOptions)
{
  const gr_face_ops ops = {sizeof(gr_face_ops), tablefn, NULL};
  return gr_make_face_with_ops(appFaceHandle, &ops, faceOptions);
}

uint32_t gr_str_to_tag(const char *str)
{
    uint32_t res = 0;
    switch(max(strlen(str),size_t(4)))
    {
        case 4: res |= str[3];       GR_FALLTHROUGH;
        case 3: res |= str[2] << 8;  GR_FALLTHROUGH;
        case 2: res |= str[1] << 16; GR_FALLTHROUGH;
        case 1: res |= str[0] << 24; GR_FALLTHROUGH;
        default:  break;
    }
    return res;
}

void gr_tag_to_str(uint32_t tag, char *str)
{
    if (!str) return;

    *str++ = char(tag >> 24);
    *str++ = char(tag >> 16);
    *str++ = char(tag >> 8);
    *str++ = char(tag);
    *str = '\0';
}

gr_feature_val* gr_face_featureval_for_lang(const gr_face* pFace, uint32_t langname/*0 means clone default*/) //clones the features. if none for language, clones the default
{
    assert(pFace);
    langname = zeropad(langname);
    return static_cast<gr_feature_val *>(pFace->theSill().cloneFeatures(langname));
}


const gr_feature_ref* gr_face_find_fref(const gr_face* pFace, uint32_t featId)  //When finished with the FeatureRef, call destroy_FeatureRef
{
    assert(pFace);
    featId = zeropad(featId);
    const FeatureRef* pRef = pFace->featureById(featId);
    return static_cast<const gr_feature_ref*>(pRef);
}

unsigned short gr_face_n_fref(const gr_face* pFace)
{
    assert(pFace);
    return pFace->numFeatures();
}

const gr_feature_ref* gr_face_fref(const gr_face* pFace, uint16_t i) //When finished with the FeatureRef, call destroy_FeatureRef
{
    assert(pFace);
    const FeatureRef* pRef = pFace->feature(i);
    return static_cast<const gr_feature_ref*>(pRef);
}

unsigned short gr_face_n_languages(const gr_face* pFace)
{
    assert(pFace);
    return pFace->theSill().numLanguages();
}

uint32_t gr_face_lang_by_index(const gr_face* pFace, uint16_t i)
{
    assert(pFace);
    return pFace->theSill().getLangName(i);
}


void gr_face_destroy(gr_face *face)
{
    delete static_cast<Face*>(face);
}


uint16_t gr_face_name_lang_for_locale(gr_face *face, const char * locale)
{
    if (face)
    {
        return face->languageForLocale(locale);
    }
    return 0;
}

unsigned short gr_face_n_glyphs(const gr_face* pFace)
{
    return pFace->glyphs().numGlyphs();
}

const gr_faceinfo *gr_face_info(const gr_face *pFace, uint32_t script)
{
    if (!pFace) return 0;
    const Silf *silf = pFace->chooseSilf(script);
    if (silf) return silf->silfInfo();
    return 0;
}

int gr_face_is_char_supported(const gr_face* pFace, uint32_t usv, uint32_t script)
{
    const Cmap & cmap = pFace->cmap();
    uint16_t gid = cmap[usv];
    if (!gid)
    {
        const Silf * silf = pFace->chooseSilf(script);
        gid = silf->findPseudo(usv);
    }
    return (gid != 0);
}

#ifndef GRAPHITE2_NFILEFACE
gr_face* gr_make_file_face(const char *filename, unsigned int faceOptions)
{
    FileFace* pFileFace = new FileFace(filename);
    if (*pFileFace)
    {
      gr_face* pRes = gr_make_face_with_ops(pFileFace, &FileFace::ops, faceOptions);
      if (pRes)
      {
        pRes->takeFileFace(pFileFace);        //takes ownership
        return pRes;
      }
    }

    //error when loading

    delete pFileFace;
    return NULL;
}

gr_face* gr_make_file_face_with_seg_cache(const char* filename, unsigned int, unsigned int faceOptions)   //returns NULL on failure. //TBD better error handling
                  //when finished with, call destroy_face
{
    return gr_make_file_face(filename, faceOptions);
}
#endif      //!GRAPHITE2_NFILEFACE

} // extern "C"