void CalculateCharWidthRange(IntPtr hDC, uint firstChar, uint numChars)
{
Win32FontSystem.ABCFLOAT[] values = new Win32FontSystem.ABCFLOAT[numChars];
Win32FontSystem.GetCharABCWidthsFloat(hDC, firstChar, firstChar + numChars - 1, values);
for (uint i = 0; i < numChars; i++)
{
Debug.Assert(!_charWidths.ContainsKey(i + firstChar));
_charWidths[i + firstChar] = values[i];
}
}
public float[] GetCharacterXPositions(Graphics g, string str)
{
#if true
// Make sure our _charWidths list has all the necessary characters.
using (GdiObjectSelector selector = new GdiObjectSelector(g, _font))
{
UpdateCharWidths(selector.HDC, str);
}
float[] xCoords = new float[str.Length];
float curXOffset = 0;
for (int i = 0; i < str.Length; i++)
{
xCoords[i] = curXOffset;
Win32FontSystem.ABCFLOAT abc = _charWidths[(uint)str[i]];
curXOffset += abc.abcfA + abc.abcfB + abc.abcfC;
}
return(xCoords);
#else
// This method gives us spacing between character cells, but it doesn't tell us what the cells are!
Win32FontSystem.GCP_RESULTS results = new Win32FontSystem.GCP_RESULTS();
results.StructSize = Marshal.SizeOf(typeof(Win32FontSystem.GCP_RESULTS));
// Setup the int array for them to write results into.
int[] dx = new int[str.Length];
GCHandle handle = GCHandle.Alloc(dx, GCHandleType.Pinned);
results.Dx = Marshal.UnsafeAddrOfPinnedArrayElement(dx, 0);
using (GdiObjectSelector selector = new GdiObjectSelector(g, _font))
{
// Call GetCharacterPlacement
Win32FontSystem.GetCharacterPlacementW(
selector.HDC,
str,
str.Length,
0, // max extent (ignored)
ref results,
(uint)Win32FontSystem.GCPFlags.GCP_USEKERNING);
}
// Unpin the array.
handle.Free();
// Convert to floats for output.
return(dx.Select(x => (float)x).ToArray());
#endif
}
void CalculateCharWidthRange( IntPtr hDC, uint firstChar, uint numChars )
{
Win32FontSystem.ABCFLOAT[] values = new Win32FontSystem.ABCFLOAT[numChars];
Win32FontSystem.GetCharABCWidthsFloat( hDC, firstChar, firstChar + numChars - 1, values );
for ( uint i=0; i < numChars; i++ )
{
Debug.Assert( !_charWidths.ContainsKey( i + firstChar ) );
_charWidths[i + firstChar] = values[i];
}
}
