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flightgear/src/GUI/FGFontCache.cxx
2020-06-12 11:26:20 +01:00

240 lines
5.9 KiB
C++
Executable file

//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
#include <config.h>
#include "FGFontCache.hxx"
// this is our one in 3rdparty
#include "fnt.h"
#include <plib/pu.h>
#include <simgear/props/props.hxx>
#include <simgear/misc/sg_dir.hxx>
#include <Main/globals.hxx>
////////////////////////////////////////////////////////////////////////
// FGFontCache class.
////////////////////////////////////////////////////////////////////////
static std::unique_ptr<FGFontCache> global_fontCacheInstance;
extern puFont FONT_HELVETICA_14;
extern puFont FONT_SANS_12B;
extern puFont FONT_HELVETICA_12;
namespace
{
struct GuiFont
{
const char* name;
puFont *font;
struct Predicate
: public std::unary_function<const GuiFont, bool>
{
Predicate(const std::string& name_) : name(name_) {}
bool operator() (const GuiFont& f1) const
{
return (name == f1.name);
}
const std::string name;
};
};
const GuiFont guifonts[] = {
{ "default", &PUFONT_HELVETICA_12 },
{ "FIXED_8x13", &PUFONT_8_BY_13 },
{ "FIXED_9x15", &PUFONT_9_BY_15 },
{ "TIMES_10", &PUFONT_TIMES_ROMAN_10 },
{ "TIMES_24", &PUFONT_TIMES_ROMAN_24 },
{ "HELVETICA_10", &PUFONT_HELVETICA_10 },
{ "HELVETICA_12", &FONT_HELVETICA_12 },
{ "HELVETICA_14", &FONT_HELVETICA_14 },
{ "HELVETICA_18", &PUFONT_HELVETICA_18 },
{ "SANS_12B", &FONT_SANS_12B },
{ 0 }
};
const GuiFont* guifontsEnd = &guifonts[sizeof(guifonts)/ sizeof(guifonts[0])-1];
}
FGFontCache* FGFontCache::instance()
{
if (!global_fontCacheInstance.get()) {
global_fontCacheInstance.reset(new FGFontCache);
}
return global_fontCacheInstance.get();
}
void FGFontCache::shutdown()
{
global_fontCacheInstance.reset();
}
FGFontCache::FGFontCache() :
_initialized(false)
{
}
FGFontCache::~FGFontCache()
{
for (auto puFontIt : _cache) {
delete puFontIt.second;
}
// these were created i initializeFonts
for (auto texFontIt : _texFonts) {
delete texFontIt.second;
}
}
inline bool FGFontCache::FntParamsLess::operator()(const FntParams& f1,
const FntParams& f2) const
{
int comp = f1.name.compare(f2.name);
if (comp < 0)
return true;
else if (comp > 0)
return false;
if (f1.size < f2.size)
return true;
else if (f1.size > f2.size)
return false;
return f1.slant < f2.slant;
}
FGFontCache::FontCacheEntry*
FGFontCache::getfnt(const std::string& fontName, float size, float slant)
{
FntParams fntParams(fontName, size, slant);
PuFontMap::iterator i = _cache.find(fntParams);
if (i != _cache.end())
return i->second;
// fntTexFont s are all preloaded into the _texFonts map
TexFontMap::iterator texi = _texFonts.find(fontName);
fntTexFont* texfont = 0;
puFont* pufont = 0;
if (texi != _texFonts.end()) {
texfont = texi->second;
} else {
const GuiFont* guifont = std::find_if(&guifonts[0], guifontsEnd,
GuiFont::Predicate(fontName));
if (guifont != guifontsEnd) {
pufont = guifont->font;
}
}
auto f = new FontCacheEntry;
if (pufont) {
f->pufont = pufont;
} else if (texfont) {
f->texfont = texfont;
f->ownsPUFont = true; // ensure it gets cleaned up
f->pufont = new puFont;
f->pufont->initialize(static_cast<fntFont *>(f->texfont), size, slant);
} else {
f->pufont = guifonts[0].font;
}
// insert into the cache
_cache[fntParams] = f;
return f;
}
puFont *
FGFontCache::get(const std::string& name, float size, float slant)
{
return getfnt(name, size, slant)->pufont;
}
fntTexFont *
FGFontCache::getTexFont(const std::string& name, float size, float slant)
{
init();
return getfnt(name, size, slant)->texfont;
}
puFont *
FGFontCache::get(SGPropertyNode *node)
{
if (!node)
return get("Helvetica.txf", 15.0, 0.0);
const char *name = node->getStringValue("name", "Helvetica.txf");
float size = node->getFloatValue("size", 15.0);
float slant = node->getFloatValue("slant", 0.0);
return get(name, size, slant);
}
void FGFontCache::init()
{
if (!_initialized) {
char *envp = ::getenv("FG_FONTS");
if (envp != NULL) {
_path = SGPath::fromEnv("FG_FONTS");
} else {
_path = globals->get_fg_root();
_path.append("Fonts");
}
_initialized = true;
}
}
SGPath
FGFontCache::getfntpath(const std::string& name)
{
init();
SGPath path(_path);
if (name != "") {
path.append(name);
if (path.exists())
return path;
}
path = SGPath(_path);
path.append("Helvetica.txf");
return path;
}
bool FGFontCache::initializeFonts()
{
static std::string fontext(".txf");
init();
auto dir = simgear::Dir(_path);
for (auto p : dir.children(simgear::Dir::TYPE_FILE, fontext)) {
fntTexFont* f = new fntTexFont;
if (f->load(p))
_texFonts[p.file()] = f;
else
delete f;
}
return true;
}
FGFontCache::FontCacheEntry::~FontCacheEntry()
{
if (ownsPUFont) {
delete pufont;
}
}