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utf-8 fix, a fixed patch from Sergey Kuleshov

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This commit is contained in:
fluxgen 2004-08-10 11:22:10 +00:00
parent 249a37333e
commit 52cb375886
2 changed files with 128 additions and 17 deletions
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139
src/FbTk/Font.cc
View file

@ -1,5 +1,5 @@
// Font.cc
// Copyright (c) 2002 Henrik Kinnunen (fluxgen@linuxmail.org)
// Copyright (c) 2002-2004 Henrik Kinnunen (fluxgen@linuxmail.org)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
@ -19,7 +19,7 @@
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//$Id: Font.cc,v 1.7 2004/06/07 11:46:05 rathnor Exp $
//$Id: Font.cc,v 1.8 2004/08/10 11:21:50 fluxgen Exp $
#include "Font.hh"
@ -44,7 +44,6 @@
#include "XFontImp.hh"
#include "GContext.hh"
//use gnu extensions
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
@ -58,12 +57,59 @@
#include <cstring>
#include <cstdlib>
#include <typeinfo>
#include <cstdlib>
using namespace std;
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif //HAVE_SETLOCALE
/**
Recodes the text from one encoding to another
assuming cd is correct
@param cd the iconv type
@param msg text to be converted
@param len number of chars to convert
@return the recoded string, or 0 on failure
*/
static char* recode(iconv_t cd,
const char *msg, size_t size) {
// If empty message, yes this can happen, return
if(strlen(msg) == 0)
return 0;
size_t inbytesleft = strlen(msg);
size_t outbytesleft = 4*inbytesleft;
char *new_msg = new char[outbytesleft];
char *new_msg_ptr = new_msg;
char *msg_ptr = strdup(msg);
if (iconv(cd, &msg_ptr, &inbytesleft, &new_msg, &outbytesleft) == -1) {
// iconv can fail for three reasons
// 1) Invalid multibyte sequence is encountered in the input
// 2) An incomplete multibyte sequence
// 3) The output buffer has no more room for the next converted character.
// So we the delete new message and return original message
delete new_msg;
free(msg_ptr);
return 0;
}
free(msg_ptr);
*new_msg_ptr = '\0';
if(inbytesleft != 0) {
delete new_msg;
return 0;
}
return new_msg;
}
namespace FbTk {
bool Font::m_multibyte = false;
@ -71,20 +117,52 @@ bool Font::m_utf8mode = false;
Font::Font(const char *name, bool antialias):
m_fontimp(0),
m_antialias(false), m_rotated(false), m_shadow(false) {
m_antialias(false), m_rotated(false), m_shadow(false),
m_iconv((iconv_t)-1) {
// MB_CUR_MAX returns the size of a char in the current locale
if (MB_CUR_MAX > 1) // more than one byte, then we're multibyte
m_multibyte = true;
char *s; // temporary string for enviroment variable
char *envstr; // temporary string for enviroment variable
// check for utf-8 mode
if (((s = getenv("LC_ALL")) && *s) ||
((s = getenv("LC_CTYPE")) && *s) ||
((s = getenv("LANG")) && *s)) {
if (strstr(s, "UTF-8"))
if (((envstr = getenv("LC_ALL")) && *envstr) ||
((envstr = getenv("LC_CTYPE")) && *envstr) ||
((envstr = getenv("LANG")) && *envstr)) {
if (strstr(envstr, "UTF-8"))
m_utf8mode = true;
m_locale = envstr;
int index = m_locale.find(".");
if (index != 0)
m_locale = m_locale.substr(index + 1);
else
m_locale = "UTF-8";
}
// if locale isn't UTF-8 we try to
// create a iconv pointer so we can
// convert non utf-8 strings to utf-8
if (m_locale != "UTF-8") {
#ifdef DEBUG
cerr<<"FbTk::Font: m_locale = "<<m_locale<<endl;
#endif // DEBUG
m_iconv = iconv_open(m_locale.c_str(), "UTF-8");
if(m_iconv == (iconv_t)(-1)) {
cerr<<"FbTk::Font: code error: from "<<m_locale<<" to: UTF-8"<<endl;
// if we failed with iconv then we can't convert
// the strings to utf-8, so we disable utf8 mode
m_utf8mode = false;
} else {
// success, we can now enable utf8mode
// and if antialias is on later we can recode
// the non utf-8 string to utf-8 and use utf-8
// drawing functions
m_utf8mode = true;
}
}
#ifdef DEBUG
cerr<<"FbTk::Font m_iconv = "<<(int)m_iconv<<endl;
#endif // DEBUG
// create the right font implementation
// antialias is prio 1
@ -103,7 +181,7 @@ Font::Font(const char *name, bool antialias):
#endif // USE_XMB
m_fontimp.reset(new XFontImp());
}
if (name != 0) {
load(name);
}
@ -111,7 +189,8 @@ Font::Font(const char *name, bool antialias):
}
Font::~Font() {
if (m_iconv != (iconv_t)(-1))
iconv_close(m_iconv);
}
void Font::setAntialias(bool flag) {
@ -186,6 +265,16 @@ bool Font::load(const std::string &name) {
}
unsigned int Font::textWidth(const char * const text, unsigned int size) const {
if (isAntialias() && m_iconv != (iconv_t)(-1)) {
char* rtext = recode(m_iconv, text, size);
if (rtext != 0)
size = strlen(rtext);
unsigned int r = m_fontimp->textWidth(rtext ? rtext : text, size);
if (rtext != 0)
delete rtext;
return r;
}
return m_fontimp->textWidth(text, size);
}
@ -200,21 +289,35 @@ int Font::ascent() const {
int Font::descent() const {
return m_fontimp->descent();
}
void Font::drawText(Drawable w, int screen, GC gc,
const char *text, size_t len, int x, int y,
bool rotate) const {
if (text == 0 || len == 0)
return;
char* rtext = 0;
// so we don't end up in a loop with m_shadow
static bool first_run = true;
if (isAntialias() && m_iconv != (iconv_t)(-1) && first_run) {
rtext = recode(m_iconv, text, len);
if (rtext != 0) {
len = strlen(rtext);
// ok, we can't use utf8 mode since the string is invalid
}
}
const char *real_text = rtext ? rtext : text;
// draw shadow first
if (first_run && m_shadow) {
FbTk::GContext shadow_gc(w);
shadow_gc.setForeground(FbTk::Color("black", screen));
first_run = false; // so we don't end up in a loop
drawText(w, screen, shadow_gc.gc(), text, len, x + 1, y + 1);
drawText(w, screen, shadow_gc.gc(), real_text, len, x + 1, y + 1);
first_run = true;
}
@ -228,16 +331,18 @@ void Font::drawText(Drawable w, int screen, GC gc,
XFontImp *font = dynamic_cast<XFontImp *>(m_fontimp.get());
font->setRotate(false); // disable rotation temporarly
font->drawText(w, screen, gc, text, len, x, y);
font->drawText(w, screen, gc, real_text, len, x, y);
font->setRotate(true); // enable rotation
} catch (std::bad_cast &bc) {
// draw normal...
m_fontimp->drawText(w, screen, gc, text, len, x, y);
m_fontimp->drawText(w, screen, gc, real_text, len, x, y);
}
} else
m_fontimp->drawText(w, screen, gc, text, len, x, y);
m_fontimp->drawText(w, screen, gc, real_text, len, x, y);
if (rtext != 0)
delete rtext;
}
@ -263,4 +368,6 @@ void Font::rotate(float angle) {
m_angle = angle;
}
};

6
src/FbTk/Font.hh
View file

@ -19,7 +19,7 @@
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//$Id: Font.hh,v 1.7 2003/12/19 17:07:53 fluxgen Exp $
//$Id: Font.hh,v 1.8 2004/08/10 11:22:10 fluxgen Exp $
#ifndef FBTK_FONT_HH
#define FBTK_FONT_HH
@ -30,6 +30,8 @@
#include <string>
#include <memory>
#include <iconv.h>
namespace FbTk {
class FontImp;
@ -100,6 +102,8 @@ private:
bool m_rotated; ///< wheter we're rotated or not
float m_angle; ///< rotation angle
bool m_shadow; ///< shadow text
std::string m_locale; ///< system encoding
iconv_t m_iconv;
};
} //end namespace FbTk