From 52cb3758861117dbd30c63fd2e24fad5e9900742 Mon Sep 17 00:00:00 2001
From: fluxgen <fluxgen>
Date: Tue, 10 Aug 2004 11:22:10 +0000
Subject: utf-8 fix, a fixed patch from Sergey Kuleshov

---
 src/FbTk/Font.cc | 139 ++++++++++++++++++++++++++++++++++++++++++++++++-------
 src/FbTk/Font.hh |   6 ++-
 2 files changed, 128 insertions(+), 17 deletions(-)

diff --git a/src/FbTk/Font.cc b/src/FbTk/Font.cc
index 453a195..75d89f1 100644
--- a/src/FbTk/Font.cc
+++ b/src/FbTk/Font.cc
@@ -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; 
@@ -71,21 +117,53 @@ 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
 #ifdef USE_XFT
@@ -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;
 }
 
+
 };
+
diff --git a/src/FbTk/Font.hh b/src/FbTk/Font.hh
index 2502c1b..fded0c4 100644
--- a/src/FbTk/Font.hh
+++ b/src/FbTk/Font.hh
@@ -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
-- 
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