michael@0: /*  GRAPHITE2 LICENSING
michael@0: 
michael@0:     Copyright 2010, SIL International
michael@0:     All rights reserved.
michael@0: 
michael@0:     This library is free software; you can redistribute it and/or modify
michael@0:     it under the terms of the GNU Lesser General Public License as published
michael@0:     by the Free Software Foundation; either version 2.1 of License, or
michael@0:     (at your option) any later version.
michael@0: 
michael@0:     This program is distributed in the hope that it will be useful,
michael@0:     but WITHOUT ANY WARRANTY; without even the implied warranty of
michael@0:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
michael@0:     Lesser General Public License for more details.
michael@0: 
michael@0:     You should also have received a copy of the GNU Lesser General Public
michael@0:     License along with this library in the file named "LICENSE".
michael@0:     If not, write to the Free Software Foundation, 51 Franklin Street, 
michael@0:     Suite 500, Boston, MA 02110-1335, USA or visit their web page on the 
michael@0:     internet at http://www.fsf.org/licenses/lgpl.html.
michael@0: 
michael@0: Alternatively, the contents of this file may be used under the terms of the
michael@0: Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
michael@0: License, as published by the Free Software Foundation, either version 2
michael@0: of the License or (at your option) any later version.
michael@0: */
michael@0: #include "graphite2/Font.h"
michael@0: #include "inc/Face.h"
michael@0: #include "inc/FileFace.h"
michael@0: #include "inc/GlyphCache.h"
michael@0: #include "inc/CachedFace.h"
michael@0: #include "inc/CmapCache.h"
michael@0: #include "inc/Silf.h"
michael@0: #include "inc/json.h"
michael@0: 
michael@0: using namespace graphite2;
michael@0: 
michael@0: #if !defined GRAPHITE2_NTRACING
michael@0: extern json *global_log;
michael@0: #endif
michael@0: 
michael@0: namespace
michael@0: {
michael@0:     bool load_face(Face & face, unsigned int options)
michael@0:     {
michael@0: #ifdef GRAPHITE2_TELEMETRY
michael@0:         telemetry::category _misc_cat(face.tele.misc);
michael@0: #endif
michael@0:         Face::Table silf(face, Tag::Silf);
michael@0:         if (silf)   options &= ~gr_face_dumbRendering;
michael@0:         else if (!(options &  gr_face_dumbRendering))
michael@0:             return false;
michael@0: 
michael@0:         if (!face.readGlyphs(options))
michael@0:             return false;
michael@0: 
michael@0:         if (silf)
michael@0:         {
michael@0:             if (!face.readFeatures() || !face.readGraphite(silf))
michael@0:             {
michael@0: #if !defined GRAPHITE2_NTRACING
michael@0:                 if (global_log)
michael@0:                 {
michael@0:                     *global_log << json::object
michael@0:                         << "type" << "fontload"
michael@0:                         << "failure" << face.error()
michael@0:                         << "context" << face.error_context()
michael@0:                     << json::close;
michael@0:                 }
michael@0: #endif
michael@0:                 return false;
michael@0:             }
michael@0:             else
michael@0:                 return true;
michael@0:         }
michael@0:         else
michael@0:             return options & gr_face_dumbRendering;
michael@0:     }
michael@0: }
michael@0: 
michael@0: extern "C" {
michael@0: 
michael@0: gr_face* gr_make_face_with_ops(const void* appFaceHandle/*non-NULL*/, const gr_face_ops *ops, unsigned int faceOptions)
michael@0:                   //the appFaceHandle must stay alive all the time when the gr_face is alive. When finished with the gr_face, call destroy_face    
michael@0: {
michael@0:     if (ops == 0)   return 0;
michael@0: 
michael@0:     Face *res = new Face(appFaceHandle, *ops);
michael@0:     if (res && load_face(*res, faceOptions))
michael@0:         return static_cast<gr_face *>(res);
michael@0: 
michael@0:     delete res;
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: gr_face* gr_make_face(const void* appFaceHandle/*non-NULL*/, gr_get_table_fn tablefn, unsigned int faceOptions)
michael@0: {
michael@0:     const gr_face_ops ops = {sizeof(gr_face_ops), tablefn, NULL};
michael@0:     return gr_make_face_with_ops(appFaceHandle, &ops, faceOptions);
michael@0: }
michael@0: 
michael@0: #ifndef GRAPHITE2_NSEGCACHE
michael@0: gr_face* gr_make_face_with_seg_cache_and_ops(const void* appFaceHandle/*non-NULL*/, const gr_face_ops *ops, unsigned int cacheSize, unsigned int faceOptions)
michael@0:                   //the appFaceHandle must stay alive all the time when the GrFace is alive. When finished with the GrFace, call destroy_face
michael@0: {
michael@0:     if (ops == 0)   return 0;
michael@0: 
michael@0:     CachedFace *res = new CachedFace(appFaceHandle, *ops);
michael@0:     if (res && load_face(*res, faceOptions)
michael@0:             && res->setupCache(cacheSize))
michael@0:         return static_cast<gr_face *>(static_cast<Face *>(res));
michael@0: 
michael@0:     delete res;
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: gr_face* gr_make_face_with_seg_cache(const void* appFaceHandle/*non-NULL*/, gr_get_table_fn getTable, unsigned int cacheSize, unsigned int faceOptions)
michael@0: {
michael@0:     const gr_face_ops ops = {sizeof(gr_face_ops), getTable, NULL};
michael@0:     return gr_make_face_with_seg_cache_and_ops(appFaceHandle, &ops, cacheSize, faceOptions);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: gr_uint32 gr_str_to_tag(const char *str)
michael@0: {
michael@0:     uint32 res = 0;
michael@0:     int i = strlen(str);
michael@0:     if (i > 4) i = 4;
michael@0:     while (--i >= 0)
michael@0:         res = (res >> 8) + (str[i] << 24);
michael@0:     return res;
michael@0: }
michael@0: 
michael@0: void gr_tag_to_str(gr_uint32 tag, char *str)
michael@0: {
michael@0:     int i = 4;
michael@0:     while (--i >= 0)
michael@0:     {
michael@0:         str[i] = tag & 0xFF;
michael@0:         tag >>= 8;
michael@0:     }
michael@0: }
michael@0: 
michael@0: inline
michael@0: uint32 zeropad(const uint32 x)
michael@0: {
michael@0:     if (x == 0x20202020)                    return 0;
michael@0:     if ((x & 0x00FFFFFF) == 0x00202020)     return x & 0xFF000000;
michael@0:     if ((x & 0x0000FFFF) == 0x00002020)     return x & 0xFFFF0000;
michael@0:     if ((x & 0x000000FF) == 0x00000020)     return x & 0xFFFFFF00;
michael@0:     return x;
michael@0: }
michael@0: 
michael@0: gr_feature_val* gr_face_featureval_for_lang(const gr_face* pFace, gr_uint32 langname/*0 means clone default*/) //clones the features. if none for language, clones the default
michael@0: {
michael@0:     assert(pFace);
michael@0:     langname = zeropad(langname);
michael@0:     return static_cast<gr_feature_val *>(pFace->theSill().cloneFeatures(langname));
michael@0: }
michael@0: 
michael@0: 
michael@0: const gr_feature_ref* gr_face_find_fref(const gr_face* pFace, gr_uint32 featId)  //When finished with the FeatureRef, call destroy_FeatureRef
michael@0: {
michael@0:     assert(pFace);
michael@0:     featId = zeropad(featId);
michael@0:     const FeatureRef* pRef = pFace->featureById(featId);
michael@0:     return static_cast<const gr_feature_ref*>(pRef);
michael@0: }
michael@0: 
michael@0: unsigned short gr_face_n_fref(const gr_face* pFace)
michael@0: {
michael@0:     assert(pFace);
michael@0:     return pFace->numFeatures();
michael@0: }
michael@0: 
michael@0: const gr_feature_ref* gr_face_fref(const gr_face* pFace, gr_uint16 i) //When finished with the FeatureRef, call destroy_FeatureRef
michael@0: {
michael@0:     assert(pFace);
michael@0:     const FeatureRef* pRef = pFace->feature(i);
michael@0:     return static_cast<const gr_feature_ref*>(pRef);
michael@0: }
michael@0: 
michael@0: unsigned short gr_face_n_languages(const gr_face* pFace)
michael@0: {
michael@0:     assert(pFace);
michael@0:     return pFace->theSill().numLanguages();
michael@0: }
michael@0: 
michael@0: gr_uint32 gr_face_lang_by_index(const gr_face* pFace, gr_uint16 i)
michael@0: {
michael@0:     assert(pFace);
michael@0:     return pFace->theSill().getLangName(i);
michael@0: }
michael@0: 
michael@0: 
michael@0: void gr_face_destroy(gr_face *face)
michael@0: {
michael@0:     delete face;
michael@0: }
michael@0: 
michael@0: 
michael@0: gr_uint16 gr_face_name_lang_for_locale(gr_face *face, const char * locale)
michael@0: {
michael@0:     if (face)
michael@0:     {
michael@0:         return face->languageForLocale(locale);
michael@0:     }
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: unsigned short gr_face_n_glyphs(const gr_face* pFace)
michael@0: {
michael@0:     return pFace->glyphs().numGlyphs();
michael@0: }
michael@0: 
michael@0: const gr_faceinfo *gr_face_info(const gr_face *pFace, gr_uint32 script)
michael@0: {
michael@0:     if (!pFace) return 0;
michael@0:     const Silf *silf = pFace->chooseSilf(script);
michael@0:     if (silf) return silf->silfInfo();
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: int gr_face_is_char_supported(const gr_face* pFace, gr_uint32 usv, gr_uint32 script)
michael@0: {
michael@0:     const Cmap & cmap = pFace->cmap();
michael@0:     gr_uint16 gid = cmap[usv];
michael@0:     if (!gid)
michael@0:     {
michael@0:         const Silf * silf = pFace->chooseSilf(script);
michael@0:         gid = silf->findPseudo(usv);
michael@0:     }
michael@0:     return (gid != 0);
michael@0: }
michael@0: 
michael@0: #ifndef GRAPHITE2_NFILEFACE
michael@0: gr_face* gr_make_file_face(const char *filename, unsigned int faceOptions)
michael@0: {
michael@0:     FileFace* pFileFace = new FileFace(filename);
michael@0:     if (*pFileFace)
michael@0:     {
michael@0:       gr_face* pRes = gr_make_face_with_ops(pFileFace, &FileFace::ops, faceOptions);
michael@0:       if (pRes)
michael@0:       {
michael@0:         pRes->takeFileFace(pFileFace);        //takes ownership
michael@0:         return pRes;
michael@0:       }
michael@0:     }
michael@0:     
michael@0:     //error when loading
michael@0: 
michael@0:     delete pFileFace;
michael@0:     return NULL;
michael@0: }
michael@0: 
michael@0: #ifndef GRAPHITE2_NSEGCACHE
michael@0: gr_face* gr_make_file_face_with_seg_cache(const char* filename, unsigned int segCacheMaxSize, unsigned int faceOptions)   //returns NULL on failure. //TBD better error handling
michael@0:                   //when finished with, call destroy_face
michael@0: {
michael@0:     FileFace* pFileFace = new FileFace(filename);
michael@0:     if (*pFileFace)
michael@0:     {
michael@0:       gr_face * pRes = gr_make_face_with_seg_cache_and_ops(pFileFace, &FileFace::ops, segCacheMaxSize, faceOptions);
michael@0:       if (pRes)
michael@0:       {
michael@0:         pRes->takeFileFace(pFileFace);        //takes ownership
michael@0:         return pRes;
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     //error when loading
michael@0: 
michael@0:     delete pFileFace;
michael@0:     return NULL;
michael@0: }
michael@0: #endif
michael@0: #endif      //!GRAPHITE2_NFILEFACE
michael@0: 
michael@0: 
michael@0: } // extern "C"
michael@0: 
michael@0: