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Optimize TextCodec initialization

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QTextCodec initialization is very slow due to it's broken caching in Qt when
ICU is enabled. Make TetCodec initialize fast anyway as it may be used very
often in IMG maps (every LBL subfile has it's own codec!).
This commit is contained in:
Martin Tůma 2023-12-21 01:31:44 +01:00
parent e05c2e0383
commit 829d85a70a
5 changed files with 48 additions and 53 deletions
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82
src/common/textcodec.cpp
View File

@ -1,56 +1,48 @@
#include <QTextCodec>
#include "textcodec.h"
TextCodec::TextCodec()
/* When Qt is compiled with ICU support, QTextCodec::codecForName() is very
slow due to broken codec name caching (the function does dozens of
comparisons and only then asks the cache...), so we use our own map. */
static QMap<int, QTextCodec *> initCodecs()
{
_codec = QTextCodec::codecForName("Windows-1252");
QMap<int, QTextCodec *> map;
map.insert(65001, 0);
map.insert(874, QTextCodec::codecForName("Windows-874"));
map.insert(932, QTextCodec::codecForName("Shift-JIS"));
map.insert(936, QTextCodec::codecForName("GB18030"));
map.insert(949, QTextCodec::codecForName("EUC-KR"));
map.insert(950, QTextCodec::codecForName("Big5"));
map.insert(1250, QTextCodec::codecForName("Windows-1250"));
map.insert(1251, QTextCodec::codecForName("Windows-1251"));
map.insert(1252, QTextCodec::codecForName("Windows-1252"));
map.insert(1253, QTextCodec::codecForName("Windows-1253"));
map.insert(1254, QTextCodec::codecForName("Windows-1254"));
map.insert(1255, QTextCodec::codecForName("Windows-1255"));
map.insert(1256, QTextCodec::codecForName("Windows-1256"));
map.insert(1257, QTextCodec::codecForName("Windows-1257"));
map.insert(1258, QTextCodec::codecForName("Windows-1258"));
return map;
}
const QMap<int, QTextCodec *> &TextCodec::codecs()
{
static QMap<int, QTextCodec *> map = initCodecs();
return map;
}
TextCodec::TextCodec(int codepage)
{
switch (codepage) {
case 65001:
_codec = 0;
break;
case 932:
_codec = QTextCodec::codecForName("Shift-JIS");
break;
case 936:
_codec = QTextCodec::codecForName("GB18030");
break;
case 949:
_codec = QTextCodec::codecForName("EUC-KR");
break;
case 950:
_codec = QTextCodec::codecForName("Big5");
break;
case 1250:
_codec = QTextCodec::codecForName("Windows-1250");
break;
case 1251:
_codec = QTextCodec::codecForName("Windows-1251");
break;
case 1253:
_codec = QTextCodec::codecForName("Windows-1253");
break;
case 1254:
_codec = QTextCodec::codecForName("Windows-1254");
break;
case 1255:
_codec = QTextCodec::codecForName("Windows-1255");
break;
case 1256:
_codec = QTextCodec::codecForName("Windows-1256");
break;
case 1257:
_codec = QTextCodec::codecForName("Windows-1257");
break;
case 1258:
_codec = QTextCodec::codecForName("Windows-1258");
break;
default:
_codec = QTextCodec::codecForName("Windows-1252");
}
const QMap<int, QTextCodec *> &map = codecs();
QMap<int, QTextCodec *>::const_iterator it(map.find(codepage));
if (it == map.cend()) {
qWarning("%d: Unsupported codepage, using UTF-8", codepage);
_codec = 0;
} else
_codec = *it;
}
QString TextCodec::toString(const QByteArray &ba) const

5
src/common/textcodec.h
View File

@ -2,19 +2,22 @@
#define TEXTCODEC_H
#include <QString>
#include <QMap>
class QTextCodec;
class TextCodec
{
public:
TextCodec();
TextCodec() : _codec(0) {}
TextCodec(int codepage);
QString toString(const QByteArray &ba) const;
private:
QTextCodec *_codec;
static const QMap<int, QTextCodec *> &codecs();
};
#endif // TEXTCODEC_H

2
src/data/gpiparser.cpp
View File

@ -128,7 +128,7 @@ qint64 CryptDevice::readData(char *data, qint64 maxSize)
class DataStream : public QDataStream
{
public:
DataStream(QIODevice *d) : QDataStream(d) {}
DataStream(QIODevice *d) : QDataStream(d), _codec(1252) {}
void setCodepage(quint16 codepage) {_codec = TextCodec(codepage);}

2
src/data/twonavparser.cpp
View File

@ -75,7 +75,7 @@ bool TwoNavParser::parse(QFile *file, QList<TrackData> &tracks,
QVector<Waypoint> &waypoints)
{
Q_UNUSED(polygons);
TextCodec codec;
TextCodec codec(1252);
GCS gcs;
bool ok, route = false, track = false, waypoint = false;

10
src/map/IMG/lblfile.h
View File

@ -16,14 +16,14 @@ class LBLFile : public SubFile
{
public:
LBLFile(const IMGData *img)
: SubFile(img), _huffmanText(0), _table(0), _rasters(0), _imgIdSize(0),
_poiShift(0), _shift(0), _encoding(0) {}
: SubFile(img), _huffmanText(0), _table(0), _rasters(0), _codec(1252),
_imgIdSize(0), _poiShift(0), _shift(0), _encoding(0) {}
LBLFile(const QString *path)
: SubFile(path), _huffmanText(0), _table(0), _rasters(0), _imgIdSize(0),
_poiShift(0), _shift(0), _encoding(0) {}
: SubFile(path), _huffmanText(0), _table(0), _rasters(0), _codec(1252),
_imgIdSize(0), _poiShift(0), _shift(0), _encoding(0) {}
LBLFile(const SubFile *gmp, quint32 offset)
: SubFile(gmp, offset), _huffmanText(0), _table(0), _rasters(0),
_imgIdSize(0), _poiShift(0), _shift(0), _encoding(0) {}
_codec(1252), _imgIdSize(0), _poiShift(0), _shift(0), _encoding(0) {}
~LBLFile();
bool load(Handle &hdl, const RGNFile *rgn, Handle &rgnHdl);