private Int32 DecodeBitFieldSigned(GlyphDecodeInfo DecodeInfo, byte NrOfBits)
{
Int32 v = DecodeBitFieldUnsigned(DecodeInfo, NrOfBits);
Int32 d = 1 << (NrOfBits - 1);
v -= d;
return(v);
}
private BDF_Glyph_Header ReadGlyphHeader(ref GlyphDecodeInfo DecodeInfo)
{
BDF_Glyph_Header GlyphHeader = new BDF_Glyph_Header();
GlyphHeader.BitmapWidth = DecodeBitFieldUnsigned(DecodeInfo, FontHeader.GlyphWidthSizeInBits);
GlyphHeader.BitmapHeight = DecodeBitFieldUnsigned(DecodeInfo, FontHeader.GlyphHeightSizeInBits);
GlyphHeader.BitmapOffsetX = DecodeBitFieldSigned(DecodeInfo, FontHeader.GlyphOffetXSizeInBits);
GlyphHeader.BitmapOffsetY = DecodeBitFieldSigned(DecodeInfo, FontHeader.GlyphOffetYSizeInBits);
GlyphHeader.BitmapPitch = DecodeBitFieldSigned(DecodeInfo, FontHeader.GlyphPitchSizeInBits);
return(GlyphHeader);
}
private void WritePixels(ref GlyphDecodeInfo DecodeInfo, Int32 NrOfPixels, bool Color)
{
for (int i = 0; i < NrOfPixels; i++)
{
if (DecodeInfo.IsBitmapReady())
{
return;
}
PutFontPixel(DecodeInfo.BitmapX + DecodeInfo.OffsetX, DecodeInfo.BitmapY + DecodeInfo.OffsetY, Color);
DecodeInfo.MoveOnePixel();
}
}
private void DrawGlyph(GlyphDecodeInfo DecodeInfo, BDF_Glyph_Header GlyphHeader)
{
while (!DecodeInfo.IsBitmapReady())
{
Int32 Pixels0 = DecodeBitFieldUnsigned(DecodeInfo, (byte)FontHeader.m0);
Int32 Pixels1 = DecodeBitFieldUnsigned(DecodeInfo, (byte)FontHeader.m1);
do
{
WritePixels(ref DecodeInfo, Pixels0, false);
WritePixels(ref DecodeInfo, Pixels1, true);
} while (DecodeBitFieldUnsigned(DecodeInfo, 1) == 1);
}
}
public Int32 GetPixelLength(String Text)
{
Int32 PixelWidth = 0;
for (int i = 0; i < Text.Length; i++)
{
Int32 GlyphPos = GetCharPos(Text[i]);
GlyphDecodeInfo DecodeInfo = new GlyphDecodeInfo(FontHeader, GlyphPos);
BDF_Glyph_Header GlyphHeader = ReadGlyphHeader(ref DecodeInfo);
PixelWidth += GlyphHeader.BitmapPitch;
}
return(PixelWidth);
}
private Int32 DecodeBitFieldUnsigned(GlyphDecodeInfo DecodeInfo, byte NrOfBits)
{
Int32 BytePos = DecodeInfo.GlyphPos + 2 + (DecodeInfo.BitOffset / 8);
Int32 AlreadyReadBitsOfByte = DecodeInfo.BitOffset % 8;
Int32 BitMask = (Int32) ~(0xFFFFFFFF << NrOfBits);
Int32 BytesValue = (Int32)(FontHeader.FontData[BytePos + 1] * 256) + FontHeader.FontData[BytePos];
BytesValue = BytesValue >> AlreadyReadBitsOfByte;
BytesValue = BytesValue & BitMask;
DecodeInfo.BitOffset += NrOfBits;
return(BytesValue);
}
private void DrawGlyph(Int32 GlyphPos, bool RightAlignment)
{
GlyphDecodeInfo DecodeInfo = new GlyphDecodeInfo(FontHeader, GlyphPos);
BDF_Glyph_Header GlyphHeader = ReadGlyphHeader(ref DecodeInfo);
DecodeInfo.SetGlyphInfo(GlyphHeader);
if (RightAlignment)
{
CursorX -= GlyphHeader.BitmapPitch;
}
DrawGlyph(DecodeInfo, GlyphHeader);
if (!ModeTransparent)
{
EraseRemainingBackground(GlyphHeader);
}
if (!RightAlignment)
{
CursorX += GlyphHeader.BitmapPitch;
}
}