Torque2D/engine/source/graphics/gFont.cc

//-----------------------------------------------------------------------------
// Copyright (c) 2013 GarageGames, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------

#include "platform/platform.h"
#include "platform/platformFont.h"
#include "debug/profiler.h"
#include "platform/threads/mutex.h"
#include "console/console.h"
#include "io/stream.h"
#include "graphics/gBitmap.h"
#include "io/fileStream.h"
#include "string/findMatch.h"
#include "graphics/TextureManager.h"
#include "graphics/gFont.h"
#include "memory/safeDelete.h"
#include "memory/frameAllocator.h"
#include "string/unicode.h"
#include "zlib.h"
#include "ctype.h"  // Needed for isupper and tolower

#include "gFont_ScriptBinding.h"

S32 GFont::smSheetIdCount = 0;
const U32 GFont::csm_fileVersion = 3;

static PlatformFont* createSafePlatformFont(const char *name, U32 size, U32 charset = TGE_ANSI_CHARSET)
{
   PlatformFont *platFont = createPlatformFont(name, size, charset);
   
   if (platFont == NULL)
   {
      Con::errorf("Loading platform font failed, trying font fallbacks...");
      // Couldn't load the requested font.  This probably will be common
      // since many unix boxes don't have arial or lucida console installed.
      // Attempt to map the font name into a font we're pretty sure exist
      // Lucida Console is a common code & console font on windows, and
      // Monaco is the recommended code & console font on mac.

      // this is the name of the final fallback font.
      const char* fallback = "Helvetica";

      if(dStricmp(name, fallback) == 0)
      {
         Con::errorf("Font fallback utterly failed.");
         return NULL;
      }
      else if (dStricmp(name, "arial") == 0)
         fallback = "Helvetica";
      else if (dStricmp(name, "lucida console") == 0)
         fallback = "Monaco";
      else if (dStricmp(name, "monaco") == 0)
         fallback = "Courier";

      platFont = createSafePlatformFont(fallback, size, charset);
   }
   
   return platFont;
}

ResourceInstance* constructNewFont(Stream& stream)
{
   GFont *ret = new GFont;

   if(!ret->read(stream))
   {
      SAFE_DELETE(ret);
   }

   if(ret)
   {
      ret->mPlatformFont = createSafePlatformFont(ret->mFaceName, ret->mSize, ret->mCharSet);
   }
   
   return ret;
}

void GFont::getFontCacheFilename(const char *faceName, U32 size, U32 buffLen, char *outBuff)
{
   dSprintf(outBuff, buffLen, "%s/%s %d (%s).uft", Con::getVariable("$GUI::fontCacheDirectory"), faceName, size, getFontCharSetName(0));
}

Resource<GFont> GFont::create(const char *faceName, U32 size, const char *cacheDirectory, U32 charset /* = TGE_ANSI_CHARSET */)
{
   char buf[256];
   dSprintf(buf, sizeof(buf), "%s/%s %d (%s).uft", cacheDirectory, faceName, size, getFontCharSetName(charset));

   Resource<GFont> ret = ResourceManager->load(buf);
   if(bool(ret))
   {
      ret->mGFTFile = StringTable->insert(buf);
      return ret;
   }

   PlatformFont *platFont = createSafePlatformFont(faceName, size, charset);
   
   AssertFatal(platFont, "platFont is null");
    
   GFont *resFont = new GFont;
   resFont->mPlatformFont = platFont;
   resFont->addSheet();
   resFont->mGFTFile = StringTable->insert(buf);
   resFont->mFaceName = StringTable->insert(faceName);
   resFont->mSize = size;
   resFont->mCharSet = charset;

   resFont->mHeight   = platFont->getFontHeight();
   resFont->mBaseline = platFont->getFontBaseLine();
   resFont->mAscent   = platFont->getFontBaseLine();
   resFont->mDescent  = platFont->getFontHeight() - platFont->getFontBaseLine();

   ResourceManager->add(buf, resFont, false);
   return ResourceManager->load(buf);
}

//-------------------------------------------------------------------------

GFont::GFont()
{
   VECTOR_SET_ASSOCIATION(mCharInfoList);
   VECTOR_SET_ASSOCIATION(mTextureSheets);

   for (U32 i = 0; i < (sizeof(mRemapTable) / sizeof(S32)); i++)
      mRemapTable[i] = -1;

   mCurX = mCurY = mCurSheet = -1;

   mPlatformFont = NULL;
   mGFTFile = NULL;
   mFaceName = NULL;
   mSize = 0;
   mCharSet = 0;
   mNeedSave = false;
   
   mMutex = Mutex::createMutex();
}

GFont::~GFont()
{
   
   // Need to stop this for now!
   mNeedSave = false; 
   if(mNeedSave)
   {
      FileStream stream;
      if(ResourceManager->openFileForWrite(stream, mGFTFile)) 
      {
         write(stream);
         stream.close();
      }
   }
   
   S32 i;

   for(i = 0;i < mCharInfoList.size();i++)
   {
       SAFE_DELETE_ARRAY(mCharInfoList[i].bitmapData);
   }

   //Luma:	decrement reference of the texture handles too
   for(i=0;i<mTextureSheets.size();i++)
   {
       mTextureSheets[i] = 0;
   }
   
   SAFE_DELETE(mPlatformFont);
   
   Mutex::destroyMutex(mMutex);
}

void GFont::dumpInfo()
{
   // Number and extent of mapped characters?
   U32 mapCount = 0, mapBegin=0xFFFF, mapEnd=0;
   for(U32 i=0; i<0x10000; i++)
   {
      if(mRemapTable[i] != -1)
      {
         mapCount++;
         if(i<mapBegin) mapBegin = i;
         if(i>mapEnd)   mapEnd   = i;
      }
   }


   // Let's write out all the info we can on this font.
   Con::printf("   '%s' %dpt", mFaceName, mSize);
   Con::printf("      - %d texture sheets, %d mapped characters.", mTextureSheets.size(), mapCount);

   if(mapCount)
      Con::printf("      - Codepoints range from 0x%x to 0x%x.", mapBegin, mapEnd);
   else
      Con::printf("      - No mapped codepoints.", mapBegin, mapEnd);
   Con::printf("      - Platform font is %s.", (mPlatformFont ? "present" : "not present") );
}

//////////////////////////////////////////////////////////////////////////

bool GFont::loadCharInfo(const UTF16 ch)
{
    if(mRemapTable[ch] != -1)
        return true;    // Not really an error

    if(mPlatformFont && mPlatformFont->isValidChar(ch))
    {
        Mutex::lockMutex(mMutex); // the CharInfo returned by mPlatformFont is static data, must protect from changes.
        PlatformFont::CharInfo &ci = mPlatformFont->getCharInfo(ch);
        if(ci.bitmapData)
            addBitmap(ci);

        mCharInfoList.push_back(ci);
        mRemapTable[ch] = mCharInfoList.size() - 1;
//don't save UFTs on the iPhone or android device
#if !defined(TORQUE_OS_IOS) && !defined(TORQUE_OS_ANDROID) && !defined(TORQUE_OS_EMSCRIPTEN)
        mNeedSave = true;
#endif

        Mutex::unlockMutex(mMutex);
        return true;
    }

    return false;
}

void GFont::addBitmap(PlatformFont::CharInfo &charInfo)
{
   // If this is called inside a glBegin - glEnd block, the texture will not be
   // updated properly.

   U32 nextCurX = U32(mCurX + charInfo.width ); /*7) & ~0x3;*/
   U32 nextCurY = U32(mCurY + mPlatformFont->getFontHeight()); // + 7) & ~0x3;

   // These are here for postmortem debugging.
   bool routeA = false, routeB = false;

   if(mCurSheet == -1 || nextCurY >= TextureSheetSize)
   {
      routeA = true;
      addSheet();

      // Recalc our nexts.
      nextCurX = U32(mCurX + charInfo.width); // + 7) & ~0x3;
      nextCurY = U32(mCurY + mPlatformFont->getFontHeight()); // + 7) & ~0x3;
   }

   if( nextCurX >= TextureSheetSize)
   {
      routeB = true;
      mCurX = 0;
      mCurY = nextCurY;

      // Recalc our nexts.
      nextCurX = U32(mCurX + charInfo.width); // + 7) & ~0x3;
      nextCurY = U32(mCurY + mPlatformFont->getFontHeight()); // + 7) & ~0x3;
   }

   // Check the Y once more - sometimes we advance to a new row and run off
   // the end.
   if(nextCurY >= TextureSheetSize)
   {
      routeA = true;
      addSheet();

      // Recalc our nexts.
      nextCurX = U32(mCurX + charInfo.width); // + 7) & ~0x3;
      nextCurY = U32(mCurY + mPlatformFont->getFontHeight()); // + 7) & ~0x3;
   }

    charInfo.bitmapIndex = mCurSheet;
    charInfo.xOffset = mCurX;
    charInfo.yOffset = mCurY;

   mCurX = nextCurX;

   GBitmap *bmp = mTextureSheets[mCurSheet].getBitmap();

   AssertFatal(bmp, "GFont::addBitmap - null texture sheet bitmap!");
   AssertFatal(bmp->getFormat() == GBitmap::Alpha, "GFont::addBitmap - cannot added characters to non-greyscale textures!");
   
   // [neo, 5/7/2007 - #3050]
   // If we get large font sizes charInfo.height/width will be larger than TextureSheetSize
   // and as GBitmap::getAddress() does no range checking the following will overrun memory! 
   // Added checks against TextureSheetSize
   for( U32 y = 0; y < charInfo.height; y++ )
   {
      S32 dy = y + charInfo.yOffset;

      if( dy >= TextureSheetSize )
         break;

      for( U32 x = 0; x < charInfo.width; x++ )
      {
         S32 dx = x + charInfo.xOffset;
         
         if( dx >= TextureSheetSize )
            break;

         *bmp->getAddress( dx, dy ) = charInfo.bitmapData[ y * charInfo.width + x ];
      }
   }
   
   mTextureSheets[mCurSheet].refresh();
}

void GFont::addSheet()
{
    char buf[30];
    dSprintf(buf, sizeof(buf), "newfont_%d", smSheetIdCount++);

    GBitmap *bitmap = new GBitmap(TextureSheetSize, TextureSheetSize, false, GBitmap::Alpha);

    // Set everything to transparent.
    U8 *bits = bitmap->getWritableBits();
    dMemset(bits, 0, sizeof(U8) *TextureSheetSize*TextureSheetSize);

    TextureHandle handle = TextureHandle(buf, bitmap, TextureHandle::BitmapKeepTexture);
    handle.setFilter(GL_NEAREST);

    mTextureSheets.increment();
    constructInPlace(&mTextureSheets.last());
    mTextureSheets.last() = handle;

    mCurX = 0;
    mCurY = 0;
    mCurSheet = mTextureSheets.size() - 1;
}

//////////////////////////////////////////////////////////////////////////

const PlatformFont::CharInfo &GFont::getCharInfo(const UTF16 in_charIndex)
{
   PROFILE_START(NewFontGetCharInfo);

   AssertFatal(in_charIndex, "GFont::getCharInfo - can't get info for char 0!");

   if(mRemapTable[in_charIndex] == -1)
   {
      loadCharInfo(in_charIndex);
   }

   AssertFatal(mRemapTable[in_charIndex] != -1, "No remap info for this character");

   PROFILE_END();

   // if we still have no character info, return the default char info.
   if(mRemapTable[in_charIndex] == -1)
      return getDefaultCharInfo();
   else
      return mCharInfoList[mRemapTable[in_charIndex]];
}

const PlatformFont::CharInfo &GFont::getDefaultCharInfo()
{
   static PlatformFont::CharInfo c;
   // c is initialized by the CharInfo default constructor.
   return c;
}

//////////////////////////////////////////////////////////////////////////

U32 GFont::getStrWidth(const UTF8* in_pString)
{
   AssertFatal(in_pString != NULL, "GFont::getStrWidth: String is NULL, width is undefined");
   // If we ain't running debug...
   if (in_pString == NULL || *in_pString == '\0')
      return 0;

   return getStrNWidth(in_pString, dStrlen(in_pString));
}

U32 GFont::getStrWidthPrecise(const UTF8* in_pString)
{
   AssertFatal(in_pString != NULL, "GFont::getStrWidth: String is NULL, height is undefined");
   // If we ain't running debug...
   if (in_pString == NULL)
      return 0;

   return getStrNWidthPrecise(in_pString, dStrlen(in_pString));
}

//////////////////////////////////////////////////////////////////////////
U32 GFont::getStrNWidth(const UTF8 *str, U32 n)
{
   // UTF8 conversion is expensive. Avoid converting in a tight loop.
   FrameTemp<UTF16> str16(n + 1);
   convertUTF8toUTF16(str, str16, n+1);
   return getStrNWidth(str16, dStrlen(str16));
}

U32 GFont::getStrNWidth(const UTF16 *str, U32 n)
{
   AssertFatal(str != NULL, "GFont::getStrNWidth: String is NULL");

   if (str == NULL || str[0] == '\0' || n == 0)   
      return 0;
      
   U32 totWidth = 0;
   UTF16 curChar;
   U32 charCount;
   
   for(charCount = 0; charCount < n; charCount++)
   {
      curChar = str[charCount];
      if(curChar == '\0')
         break;

      if(isValidChar(curChar))
      {
         const PlatformFont::CharInfo& rChar = getCharInfo(curChar);
         totWidth += rChar.xIncrement;
      }
      else if (curChar == dT('\t'))
      {
         const PlatformFont::CharInfo& rChar = getCharInfo(dT(' '));
         totWidth += rChar.xIncrement * TabWidthInSpaces;
      }
   }

   return(totWidth);
}

U32 GFont::getStrNWidthPrecise(const UTF8 *str, U32 n)
{
   FrameTemp<UTF16> str16(n + 1);
   convertUTF8toUTF16(str, str16, n);
   return getStrNWidthPrecise(str16, n);
}

U32 GFont::getStrNWidthPrecise(const UTF16 *str, U32 n)
{
   AssertFatal(str != NULL, "GFont::getStrNWidth: String is NULL");

   if (str == NULL || str[0] == '\0' || n == 0)   
      return(0);
      
   U32 totWidth = 0;
   UTF16 curChar;
   U32 charCount = 0;
   
   for(charCount = 0; charCount < n; charCount++)
   {
      curChar = str[charCount];
      if(curChar == '\0')
         break;
         
      if(isValidChar(curChar))
      {
         const PlatformFont::CharInfo& rChar = getCharInfo(curChar);
         totWidth += rChar.xIncrement;
      }
      else if (curChar == dT('\t'))
      {
         const PlatformFont::CharInfo& rChar = getCharInfo(dT(' '));
         totWidth += rChar.xIncrement * TabWidthInSpaces;
      }
   }

   UTF16 endChar = str[getMin(charCount,n-1)];

   if (isValidChar(endChar))
   {
      const PlatformFont::CharInfo& rChar = getCharInfo(endChar);
      if ((S32)rChar.width > rChar.xIncrement)
         totWidth += (rChar.width - rChar.xIncrement);
   }

   return(totWidth);
}

U32 GFont::getBreakPos(const UTF16 *str16, U32 slen, U32 width, bool breakOnWhitespace)
{
   // Some early out cases.
   if(slen==0)
      return 0;

   U32 ret = 0;
   U32 lastws = 0;
   UTF16 c;
   U32 charCount = 0;

   for( charCount=0; charCount < slen; charCount++)
   {
      c = str16[charCount];
      if(c == '\0')
         break;
         
      if(c == dT('\t'))
         c = dT(' ');
      if(!isValidChar(c))
      {
         ret++;
         continue;
      }
      if(c == dT(' '))
         lastws = ret+1;
      const PlatformFont::CharInfo& rChar = getCharInfo(c);
      if(rChar.width > width || rChar.xIncrement > (S32)width)
      {
         if(lastws && breakOnWhitespace)
            return lastws;
         return ret;
      }
      width -= rChar.xIncrement;
      
      ret++;
   }
   return ret;
}

void GFont::wrapString(const UTF8 *txt, U32 lineWidth, Vector<U32> &startLineOffset, Vector<U32> &lineLen)
{
   Con::errorf("GFont::wrapString(): Not yet converted to be UTF-8 safe");

   startLineOffset.clear();
   lineLen.clear();

   if (!txt || !txt[0] || lineWidth < getCharWidth('W')) //make sure the line width is greater then a single character
      return;

   U32 len = dStrlen(txt);

   U32 startLine; 

   for (U32 i = 0; i < len;)
   {
      startLine = i;
      startLineOffset.push_back(startLine);

      // loop until the string is too large
      bool needsNewLine = false;
      U32 lineStrWidth = 0;
      for (; i < len; i++)
      {
         if(isValidChar(txt[i]))
         {
            lineStrWidth += getCharInfo(txt[i]).xIncrement;
            if ( txt[i] == '\n' || lineStrWidth > lineWidth )
            {
               needsNewLine = true;
               break;      
            }
         }
      }

      if (!needsNewLine)
      {
         // we are done!
         lineLen.push_back(i - startLine);
         return;
      }

      // now determine where to put the newline
      // else we need to backtrack until we find a either space character 
      // or \\ character to break up the line. 
      S32 j;
      for (j = i - 1; j >= (S32)startLine; j--)
      {
         if (dIsspace(txt[j]))
            break;
      }

      if (j < (S32)startLine)
      {
         // the line consists of a single word!              
         // So, just break up the word
         j = i - 1;
      }
      lineLen.push_back(j - startLine);
      i = j;

      // now we need to increment through any space characters at the
      // beginning of the next line
      for (i++; i < len; i++)
      {
         if (!dIsspace(txt[i]) || txt[i] == '\n')
            break;
      }
   }
}

//////////////////////////////////////////////////////////////////////////

bool GFont::read(Stream& io_rStream)
{
    // Handle versioning
    U32 version;
    io_rStream.read(&version);
    if(version != csm_fileVersion)
        return false;

    char buf[256];
    io_rStream.readString(buf);
    mFaceName = StringTable->insert(buf);

    io_rStream.read(&mSize);
    io_rStream.read(&mCharSet);

    io_rStream.read(&mHeight);
    io_rStream.read(&mBaseline);
    io_rStream.read(&mAscent);
    io_rStream.read(&mDescent);

    U32 size = 0;
    io_rStream.read(&size);
    mCharInfoList.setSize(size);
    U32 i;
    for(i = 0; i < size; i++)
    {
        PlatformFont::CharInfo *ci = &mCharInfoList[i];
        io_rStream.read(&ci->bitmapIndex);
        io_rStream.read(&ci->xOffset);
        io_rStream.read(&ci->yOffset);
        io_rStream.read(&ci->width);
        io_rStream.read(&ci->height);
        io_rStream.read(&ci->xOrigin);
        io_rStream.read(&ci->yOrigin);
        io_rStream.read(&ci->xIncrement);
        ci->bitmapData = NULL;
   }

   U32 numSheets = 0;
   io_rStream.read(&numSheets);
   
   for(i = 0; i < numSheets; i++)
   {
       GBitmap *bmp = new GBitmap;
       if(!bmp->readPNG(io_rStream))
       {
           delete bmp;
           return false;
       }

       char buf[30];
       dSprintf(buf, sizeof(buf), "font_%d", smSheetIdCount++);

       mTextureSheets.increment();
       constructInPlace(&mTextureSheets.last());
       mTextureSheets.last() = TextureHandle(buf, bmp, TextureHandle::BitmapKeepTexture);
       mTextureSheets.last().setFilter(GL_NEAREST);;
   }
   
   // Read last position info
   io_rStream.read(&mCurX);
   io_rStream.read(&mCurY);
   io_rStream.read(&mCurSheet);

   // Read the remap table.
   U32 minGlyph, maxGlyph;
   io_rStream.read(&minGlyph);
   io_rStream.read(&maxGlyph);

   if(maxGlyph >= minGlyph)
   {
      // Length of buffer..
      U32 buffLen;
      io_rStream.read(&buffLen);

      // Read the buffer.
      FrameTemp<S32> inBuff(buffLen);
      io_rStream.read(buffLen, inBuff);

      // Decompress.
      uLongf destLen = (maxGlyph-minGlyph+1)*sizeof(S32);
      uncompress((Bytef*)&mRemapTable[minGlyph], &destLen, (Bytef*)(S32*)inBuff, buffLen);

      AssertISV(destLen == (maxGlyph-minGlyph+1)*sizeof(S32), "GFont::read - invalid remap table data!");

      // Make sure we've got the right endianness.
      for(i = minGlyph; i <= maxGlyph; i++) {
         mRemapTable[i] = convertBEndianToHost(mRemapTable[i]);
         if( mRemapTable[i] == -1 ) {
             Con::errorf( "bogus mRemapTable[i] value in %s %i", mFaceName, mSize );
         }
      }
   }
   
   return (io_rStream.getStatus() == Stream::Ok);
}

bool GFont::write(Stream& stream)
{
    // Handle versioning
    stream.write(csm_fileVersion);

    // Write font info
    stream.writeString(mFaceName);
    stream.write(mSize);
    stream.write(mCharSet);
   
    stream.write(mHeight);
    stream.write(mBaseline);
    stream.write(mAscent);
    stream.write(mDescent);


   // Get the min/max we have values for, and only write that range out.
   S32 minGlyph = S32_MAX, maxGlyph = 0;
   S32 i;

   for(i = 0; i < 65536; i++)
   {
       if(mRemapTable[i] != -1)
       {
           if(i > maxGlyph) maxGlyph = i;
           if(i < minGlyph) minGlyph = i;
       }
   }

   //-Mat make sure all our character info is good before writing it
   for(i = minGlyph; i <= maxGlyph; i++) {
       if( mRemapTable[i] == -1 ) {
           //-Mat get info and try this again
           getCharInfo(i);
           if( mRemapTable[i] == -1 ) {
               Con::errorf( "GFont::write() couldn't get character info for char %i", i);
           }
       }
   }

    // Write char info list
    stream.write(U32(mCharInfoList.size()));
    for(i = 0; i < mCharInfoList.size(); i++)
    {
        const PlatformFont::CharInfo *ci = &mCharInfoList[i];
        stream.write(ci->bitmapIndex);
        stream.write(ci->xOffset);
        stream.write(ci->yOffset);
        stream.write(ci->width);
        stream.write(ci->height);
        stream.write(ci->xOrigin);
        stream.write(ci->yOrigin);
        stream.write(ci->xIncrement);
   }

   stream.write(mTextureSheets.size());
   for(i = 0; i < mTextureSheets.size(); i++) {
       mTextureSheets[i].getBitmap()->writePNG(stream);
   }

   stream.write(mCurX);
   stream.write(mCurY);
   stream.write(mCurSheet);


   stream.write(minGlyph);
   stream.write(maxGlyph);

   // Skip it if we don't have any glyphs to do...
   if(maxGlyph >= minGlyph)
   {
      // Put everything big endian, to be consistent. Do this inplace.
      for(i = minGlyph; i <= maxGlyph; i++)
         mRemapTable[i] = convertHostToBEndian(mRemapTable[i]);

      {
         // Compress.
         const U32 buffSize = 128 * 1024;
         FrameTemp<S32> outBuff(buffSize);
         uLongf destLen = buffSize * sizeof(S32);
         compress2((Bytef*)(S32*)outBuff, &destLen, (Bytef*)(S32*)&mRemapTable[minGlyph], (maxGlyph-minGlyph+1)*sizeof(S32), 9);

         // Write out.
         stream.write((U32)destLen);
         stream.write((U32)destLen, outBuff);
      }

      // Put us back to normal.
      for(i = minGlyph; i <= maxGlyph; i++) {
         mRemapTable[i] = convertBEndianToHost(mRemapTable[i]);

         if( mRemapTable[i] == -1 ) {
             Con::errorf( "bogus mRemapTable[i] value in %s %i", mFaceName, mSize );
         }
      }
   }
   
   return (stream.getStatus() == Stream::Ok);
}

void GFont::exportStrip(const char *fileName, U32 padding, U32 kerning)
{
   // Figure dimensions of our strip by iterating over all the char infos.
   U32 totalHeight = 0;
   U32 totalWidth = 0;

   S32 heightMin=0, heightMax=0;

   for(S32 i=0; i<mCharInfoList.size(); i++)
   {
      totalWidth += mCharInfoList[i].width + kerning + 2*padding;
      heightMin = getMin((S32)heightMin, (S32)getBaseline() - (S32)mCharInfoList[i].yOrigin);
      heightMax = getMax((S32)heightMax, (S32)getBaseline() - (S32)mCharInfoList[i].yOrigin + (S32)mCharInfoList[i].height);
   }

   totalHeight = heightMax - heightMin + 2*padding;

   // Make the bitmap.
   GBitmap gb(totalWidth, totalHeight, false, mTextureSheets[0].getBitmap()->getFormat());

   dMemset(gb.getWritableBits(), 0, sizeof(U8) * totalHeight * totalWidth );

   // Ok, copy some rects, taking into account padding, kerning, offset.
   U32 curWidth = kerning + padding;

   for(S32 i=0; i<mCharInfoList.size(); i++)
   {
      // Skip invalid stuff.
      if(mCharInfoList[i].bitmapIndex == -1 || mCharInfoList[i].height == 0 || mCharInfoList[i].width == 0)
         continue;

      // Copy the rect.
      U32 bitmap = mCharInfoList[i].bitmapIndex;

      RectI ri(mCharInfoList[i].xOffset, mCharInfoList[i].yOffset, mCharInfoList[i].width, mCharInfoList[i].height );
      Point2I outRi(curWidth, padding + getBaseline() - mCharInfoList[i].yOrigin);
      gb.copyRect(mTextureSheets[bitmap].getBitmap(), ri, outRi); 

      // Advance.
      curWidth +=  mCharInfoList[i].width + kerning + 2*padding;
   }

   // Write the image!
   FileStream fs;
   
   if(!ResourceManager->openFileForWrite(fs, fileName))
   {
      Con::errorf("GFont::exportStrip - failed to open '%s' for writing.", fileName);
      return;
   }
 
   // Done!
   gb.writePNG(fs, false);
}

/// Used for repacking in GFont::importStrip.
struct GlyphMap
{
   U32 charId;
   GBitmap *bitmap;
};

static S32 QSORT_CALLBACK GlyphMapCompare(const void *a, const void *b)
{
   S32 ha = ((GlyphMap *) a)->bitmap->height;
   S32 hb = ((GlyphMap *) b)->bitmap->height;

   return hb - ha;
}


void GFont::importStrip(const char *fileName, U32 padding, U32 kerning)
{
   // Wipe our texture sheets, and reload bitmap data from the specified file.
   // Also deal with kerning.
   // Also, we may have to load RGBA instead of RGB.

   // Wipe our texture sheets.
   mCurSheet = mCurX = mCurY = 0;
   mTextureSheets.clear();

   //  Now, load the font strip.
   GBitmap *strip = GBitmap::load(fileName);

   if(!strip)
   {
      Con::errorf("GFont::importStrip - could not load file '%s'!", fileName);
      return;
   }

   // And get parsing and copying - load up all the characters as separate
   // GBitmaps, sort, then pack. Not terribly efficient but this is basically
   // on offline task anyway.

   // Ok, snag some glyphs.
   Vector<GlyphMap> glyphList;
   glyphList.reserve(mCharInfoList.size());

   U32 curWidth = 0;
   for(S32 i=0; i<mCharInfoList.size(); i++)
   {
      // Skip invalid stuff.
      if(mCharInfoList[i].bitmapIndex == -1 || mCharInfoList[i].height == 0 || mCharInfoList[i].width == 0)
         continue;

      // Allocate a new bitmap for this glyph, taking into account kerning and padding.
      glyphList.increment();
      glyphList.last().bitmap = new GBitmap(mCharInfoList[i].width + kerning + 2*padding, mCharInfoList[i].height + 2*padding, false, strip->getFormat());
      glyphList.last().charId = i;

      // Copy the rect.
      RectI ri(curWidth, getBaseline() - mCharInfoList[i].yOrigin, glyphList.last().bitmap->width, glyphList.last().bitmap->height);
      Point2I outRi(0,0);
      glyphList.last().bitmap->copyRect(strip, ri, outRi); 

      // Update glyph attributes.
      mCharInfoList[i].width = glyphList.last().bitmap->width;
      mCharInfoList[i].height = glyphList.last().bitmap->height;
      mCharInfoList[i].xOffset -= kerning + padding;
      mCharInfoList[i].xIncrement += kerning;
      mCharInfoList[i].yOffset -= padding;

      // Advance.
      curWidth += ri.extent.x;
   }

   // Ok, we have a big list of glyphmaps now. So let's sort them, then pack them.
   dQsort(glyphList.address(), glyphList.size(), sizeof(GlyphMap), GlyphMapCompare);

   // They're sorted by height, so now we can do some sort of awesome packing.
   Point2I curSheetSize(256, 256);
   Vector<U32> sheetSizes;

   S32 curY = 0;
   S32 curX = 0;
   S32 curLnHeight = 0;
   S32 maxHeight = 0;
   for(U32 i = 0; i < (U32)glyphList.size(); i++)
   {
      PlatformFont::CharInfo *ci = &mCharInfoList[glyphList[i].charId];
      
      if(ci->height > (U32)maxHeight)
         maxHeight = ci->height;

      if(curX + ci->width > (U32)curSheetSize.x)
      {
         curY += curLnHeight;
         curX = 0;
         curLnHeight = 0;
      }

      if(curY + ci->height > (U32)curSheetSize.y)
      {
         sheetSizes.push_back(curSheetSize.y);
         curX = 0;
         curY = 0;
         curLnHeight = 0;
      }

      if(ci->height > (U32)curLnHeight)
         curLnHeight = ci->height;
      
      ci->bitmapIndex = sheetSizes.size();
      ci->xOffset = curX;
      ci->yOffset = curY;
      curX += ci->width;
   }

   // Terminate the packing loop calculations.
   curY += curLnHeight;

   if(curY < 64)
      curSheetSize.y = 64;
   else if(curY < 128)
      curSheetSize.y = 128;

   sheetSizes.push_back(curSheetSize.y);

   if(getHeight() + padding * 2 > (U32)maxHeight)
      maxHeight = getHeight() + padding * 2;

   // Allocate texture pages.
   for(S32 i=0; i<sheetSizes.size(); i++)
   {
      char buf[30];
      dSprintf(buf, sizeof(buf), "newfont_%d", smSheetIdCount++);

      GBitmap *bitmap = new GBitmap(TextureSheetSize, TextureSheetSize, false, strip->getFormat());

      // Set everything to transparent.
      U8 *bits = bitmap->getWritableBits();
      dMemset(bits, 0, sizeof(U8) *TextureSheetSize*TextureSheetSize * strip->bytesPerPixel);

      TextureHandle handle = TextureHandle( buf, bitmap, TextureHandle::BitmapKeepTexture );
      mTextureSheets.increment();
      constructInPlace(&mTextureSheets.last());
      mTextureSheets.last() = handle;
   }


   // Alright, we're ready to copy bits!
   for(S32 i=0; i<glyphList.size(); i++)
   {
      // Copy each glyph into the appropriate place.
      PlatformFont::CharInfo *ci = &mCharInfoList[glyphList[i].charId];
      U32 bi = ci->bitmapIndex;
      mTextureSheets[bi].getBitmap()->copyRect(glyphList[i].bitmap, RectI(0,0, glyphList[i].bitmap->width,glyphList[i].bitmap->height), Point2I(ci->xOffset, ci->yOffset));
   }

   // Ok, all done! Just refresh some textures and we're set.
   for(S32 i=0; i<sheetSizes.size(); i++)
      mTextureSheets[i].refresh();
}