//--------------------------------------------------------------------//
// M e t h o d //
// w r i t e C h a r //
//--------------------------------------------------------------------//
// //
// Write PCL XL format character: //
// //
// ReadChar operator //
// Embedded Data header //
// character data //
// //
// Note that the function may be called recursively, if a glyph is //
// composite (i.e. made up of two or more components). //
// //
// Unbound fonts: write Class 0 characters; these rely on the GT //
// GT segment in the font header //
// containing the 'hhea' and 'htmx' //
// tables. //
// Bound fonts: write Class 1 characters, which include advance //
// width and LSB in each character //
// header. //
// //
//--------------------------------------------------------------------//
private void writeChar(Int32 charClass,
UInt16 charCode,
UInt16 codepoint,
UInt16 glyphId,
UInt16 depth,
UInt16 maxGlyphId)
{
UInt16 glyphWidth = 0,
glyphHeight = 0,
charDataSize = 0,
charSize,
hddrSize;
Int16 glyphLSB = 0,
glyphTSB = 0;
UInt32 glyphOffset = 0,
glyphLength = 0;
Boolean glyphComposite = false;
Byte checksumMod256 = 0;
Byte[] glyphData = null;
Byte[] charHddr;
if (charClass == 1)
{
hddrSize = cSizeCharHddrClass1;
}
else if (charClass == 2)
{
hddrSize = cSizeCharHddrClass2;
}
else
{
hddrSize = cSizeCharHddrClass0;
}
charHddr = new Byte[hddrSize];
//----------------------------------------------------------------//
// //
// Mark glyph as used. //
// These markers are checked for composite sub-glyphs. //
// //
//----------------------------------------------------------------//
_ttfHandler.glyphReferencedMark(glyphId);
//----------------------------------------------------------------//
// //
// Get glyph details: //
// advance width. //
// left-side bearing. //
// offset and length of the glyph data in the TTF file. //
// //
//----------------------------------------------------------------//
_ttfHandler.getGlyphData(glyphId,
ref glyphWidth,
ref glyphHeight, // not used
ref glyphLSB,
ref glyphTSB,
ref glyphOffset,
ref glyphLength,
ref glyphComposite);
//----------------------------------------------------------------//
// //
// Log character details. //
// //
//----------------------------------------------------------------//
ToolSoftFontGenLog.logCharDetails(_tableLog,
false,
glyphComposite,
charCode,
codepoint,
glyphId,
depth,
glyphWidth,
glyphHeight,
glyphLSB,
glyphTSB,
glyphOffset,
glyphLength);
//----------------------------------------------------------------//
// //
// Calculate total size of header. //
// //
// Write ReadChar operator and associated Attribute List. //
// Write Embedded Data Introduction sequence. //
// //
//----------------------------------------------------------------//
charDataSize = (UInt16)(hddrSize + glyphLength);
charSize = (UInt16)(charDataSize - 2);
PCLXLWriter.fontCharRead(_binWriter, false,
charCode, charDataSize);
PCLXLWriter.embedDataIntro(_binWriter,
false,
charDataSize);
if (charClass == 0)
{
//------------------------------------------------------------//
// //
// Write Format 1 Class 0 header. //
// //
//------------------------------------------------------------//
charHddr [0] = 1; // Format
charHddr [1] = 0; // Class
charHddr [2] = msByte(charSize); // CharSize MSB
charHddr [3] = lsByte(charSize); // CharSize LSB
charHddr [4] = msByte(glyphId); // Glyph Id MSB
charHddr [5] = lsByte(glyphId); // Glyph Id LSB
}
else if (charClass == 1)
{
//------------------------------------------------------------//
// //
// Write Format 1 Class 1 header. //
// //
//------------------------------------------------------------//
charHddr [0] = 1; // Format
charHddr [1] = 1; // Class
charHddr [2] = msByte(charSize); // CharSize MSB
charHddr [3] = lsByte(charSize); // CharSize LSB
charHddr [4] = msByte((UInt16)glyphLSB); // Glyph Left Side Bearing
charHddr [5] = lsByte((UInt16)glyphLSB); // Glyph Left Side Bearing
charHddr [6] = msByte(glyphWidth); // Glyph Width MSB
charHddr [7] = lsByte(glyphWidth); // Glyph Width LSB
charHddr [8] = msByte(glyphId); // Glyph Id MSB
charHddr [9] = lsByte(glyphId); // Glyph Id LSB
}
else // charClass == 2
{
//------------------------------------------------------------//
// //
// Write Format 1 Class 2 header. //
// //
//------------------------------------------------------------//
charHddr [0] = 1; // Format
charHddr [1] = 2; // Class
charHddr [2] = msByte(charSize); // CharSize MSB
charHddr [3] = lsByte(charSize); // CharSize LSB
charHddr [4] = msByte((UInt16)glyphLSB); // Glyph Left Side Bearing
charHddr [5] = lsByte((UInt16)glyphLSB); // Glyph Left Side Bearing
charHddr [6] = msByte(glyphWidth); // Glyph Width MSB
charHddr [7] = lsByte(glyphWidth); // Glyph Width LSB
charHddr [8] = msByte((UInt16)glyphTSB); // Glyph Top Side Bearing
charHddr [9] = lsByte((UInt16)glyphTSB); // Glyph Top Side Bearing
charHddr [10] = msByte(glyphId); // Glyph Id MSB
charHddr [11] = lsByte(glyphId); // Glyph Id LSB
}
_baseHandler.writeBuffer(hddrSize, charHddr);
//----------------------------------------------------------------//
// //
// Write TrueType glyph data (copied from TrueType font file). //
// The data is read into a dynamically allocated buffer because: //
// - This avoids the complication of having a fixed-length //
// buffer and a loop to read the data in chunks. //
// - Not having a static buffer allows the function to be //
// called recursively. //
// //
//----------------------------------------------------------------//
if (glyphLength > 0)
{
Boolean flagOK = true;
glyphData = new Byte[glyphLength];
flagOK = _ttfHandler.readByteArray((Int32)glyphOffset,
(Int32)glyphLength,
ref glyphData);
// TODO: what if flagOK = true (i.e. read fails?
_baseHandler.writeCharFragment((Int32)glyphLength,
glyphData,
ref checksumMod256);
}
//----------------------------------------------------------------//
// //
// Handler composite glyphs. //
// //
//----------------------------------------------------------------//
if (glyphComposite)
{
// if we move this to TTFHandler, do the maxGlyphId check there instead
Int32 indBuf;
UInt16 glyphCompFlags,
glyphCompId;
indBuf = 10; // point to first set of component data //
do
{
glyphCompFlags = (UInt16)((glyphData[indBuf] << 8) +
glyphData[indBuf + 1]);
glyphCompId = (UInt16)((glyphData[indBuf + 2] << 8) +
glyphData[indBuf + 3]);
if (glyphCompId > maxGlyphId)
{
// flagOK = false;
ToolSoftFontGenLog.logError(
_tableLog, MessageBoxImage.Error,
"Composite glyph identifier " + glyphCompId +
" > maximum of " + maxGlyphId);
}
else
{
if (_ttfHandler.glyphReferencedCheck(glyphCompId))
{
ToolSoftFontGenLog.logCharDetails(
_tableLog,
true,
_ttfHandler.glyphCompositeCheck(glyphCompId),
0,
0,
glyphCompId,
depth,
0,
0,
0,
0,
0,
0);
}
else
{
// flagOK =
writeChar(charClass, 0xffff, 0, glyphCompId,
(UInt16)(depth + 1), maxGlyphId);
}
}
// if flagOK
{
indBuf += 4;
if ((glyphCompFlags &
ToolSoftFontGenTTF.mask_glyf_compFlag_ARG_1_AND_2_ARE_WORDS) != 0)
{
indBuf += 4;
}
else
{
indBuf += 2;
}
if ((glyphCompFlags &
ToolSoftFontGenTTF.mask_glyf_compFlag_WE_HAVE_A_TWO_BY_TWO) != 0)
{
indBuf += 8;
}
else if ((glyphCompFlags &
ToolSoftFontGenTTF.mask_glyf_compFlag_WE_HAVE_AN_X_AND_Y_SCALE) != 0)
{
indBuf += 4;
}
else if ((glyphCompFlags &
ToolSoftFontGenTTF.mask_glyf_compFlag_WE_HAVE_A_SCALE) != 0)
{
indBuf += 2;
}
}
} while ((glyphCompFlags &
ToolSoftFontGenTTF.mask_glyf_compFlag_MORE_COMPONENTS) != 0);
}
}