public static extern int GetCodepointKernAdvance(
FontInfo info,
int ch1,
int ch2);
private static extern void GetFontVMetrics(
ref FontInfo info,
ref int ascent,
ref int descent,
ref int lineGap);
/// <summary>
///
/// </summary>
/// <param name="info"></param>
/// <param name="scale_x"></param>
/// <param name="scale_y"></param>
/// <param name="codepoint"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="xoff"></param>
/// <param name="yoff"></param>
/// <returns></returns>
/// <remarks>
/// allocates a large-enough single-channel 8bpp bitmap and renders the
/// specified character/glyph at the specified scale into it, with
/// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
/// *width & *height are filled out with the width & height of the bitmap,
/// which is stored left-to-right, top-to-bottom.
///
/// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
///</remarks>
public static byte[] GetCodepointBitmap(
FontInfo info,
float scale_x,
float scale_y,
int codepoint,
ref int width,
ref int height,
int?xoff,
int?yoff)
{
//TODO: What if width and height can be null? There will be 6 combinations!
byte[] result;
if (xoff.HasValue && yoff.HasValue)
{
int xoffTmp = 0, yoffTmp = 0;
var ptr = GetCodepointBitmap(ref info, scale_x, scale_y, codepoint,
ref width, ref height,
ref xoffTmp,
ref yoffTmp);
if (ptr == IntPtr.Zero)
{
throw new Exception("GetCodepointBitmap Failed");
}
else
{
result = new byte[width * height];
Marshal.Copy(ptr, result, 0, result.Length);
}
xoff = xoffTmp;
yoff = xoffTmp;
}
else if (xoff.HasValue)
{
int xoffTmp = 0;
var ptr = GetCodepointBitmap(ref info, scale_x, scale_y, codepoint,
ref width, ref height,
ref xoffTmp,
IntPtr.Zero);
if (ptr == IntPtr.Zero)
{
throw new Exception("GetCodepointBitmap Failed");
}
else
{
result = new byte[width * height];
Marshal.Copy(ptr, result, 0, result.Length);
}
xoff = xoffTmp;
}
else if (yoff.HasValue)
{
int yoffTmp = 0;
var ptr = GetCodepointBitmap(ref info, scale_x, scale_y, codepoint,
ref width, ref height,
IntPtr.Zero,
ref yoffTmp);
if (ptr == IntPtr.Zero)
{
throw new Exception("GetCodepointBitmap Failed");
}
else
{
result = new byte[width * height];
Marshal.Copy(ptr, result, 0, result.Length);
}
yoff = yoffTmp;
}
else
{
var ptr = GetCodepointBitmap(ref info, scale_x, scale_y, codepoint,
ref width, ref height,
IntPtr.Zero,
IntPtr.Zero);
if (ptr == IntPtr.Zero)
{
throw new Exception("GetCodepointBitmap Failed");
}
else
{
result = new byte[width * height];
Marshal.Copy(ptr, result, 0, result.Length);
}
}
return(result);
}
public static extern void GetCodepointHMetrics(
FontInfo info,
int codepoint,
ref int advanceWidth,
ref int leftSideBearing);
public static extern int InitFont(
ref FontInfo info,
IntPtr data,
int offset);
