/// <summary>
/// Measure the width and height of string <paramref name="str"/> when drawn on device context HDC
/// using the given font <paramref name="font"/>.<br/>
/// Restrict the width of the string and get the number of characters able to fit in the restriction and
/// the width those characters take.
/// </summary>
/// <param name="str">the string to measure</param>
/// <param name="font">the font to measure string with</param>
/// <param name="maxWidth">the max width to render the string in</param>
/// <param name="charFit">the number of characters that will fit under <see cref="maxWidth"/> restriction</param>
/// <param name="charFitWidth"></param>
/// <returns>the size of the string</returns>
public static Size MeasureString(char[] buff, int startAt, int len, RequestFont font, float maxWidth, out int charFit, out int charFitWidth)
{
//if (_useGdiPlusTextRendering)
//{
// ReleaseHdc();
// throw new NotSupportedException("Char fit string measuring is not supported for GDI+ text rendering");
//}
//else
//{
SetFont(font);
if (buff.Length == 0)
{
charFit = 0;
charFitWidth = 0;
return(Size.Empty);
}
var size = new Size();
unsafe
{
fixed(char *startAddr = &buff[0])
{
NativeTextWin32.UnsafeGetTextExtentExPoint(
win32MemDc.DC, startAddr + startAt, len,
(int)Math.Round(maxWidth), _charFit, _charFitWidth, ref size);
}
}
charFit = _charFit[0];
charFitWidth = charFit > 0 ? _charFitWidth[charFit - 1] : 0;
return(size);
//}
}
internal static void MeasureCharWidths(IntPtr hFont,
out int[] charWidths,
out NativeTextWin32.FontABC[] abcSizes)
{
//only in ascii range
//current version
charWidths = new int[MAX_CODEPOINT_NO + 1]; //
MyWin32.SelectObject(win32MemDc.DC, hFont);
unsafe
{
//see: https://msdn.microsoft.com/en-us/library/ms404377(v=vs.110).aspx
//A code page contains 256 code points and is zero-based.
//In most code pages, code points 0 through 127 represent the ASCII character set,
//and code points 128 through 255 differ significantly between code pages
abcSizes = new NativeTextWin32.FontABC[MAX_CODEPOINT_NO + 1];
fixed(NativeTextWin32.FontABC *abc = abcSizes)
{
NativeTextWin32.GetCharABCWidths(win32MemDc.DC, (uint)0, (uint)MAX_CODEPOINT_NO, abc);
}
for (int i = 0; i < (MAX_CODEPOINT_NO + 1); ++i)
{
charWidths[i] = abcSizes[i].Sum;
}
}
}
public static Size MeasureString(char[] buff, int startAt, int len, RequestFont font)
{
SetFont(font);
var size = new Size();
if (buff.Length > 0)
{
unsafe
{
fixed(char *startAddr = &buff[0])
{
NativeTextWin32.UnsafeGetTextExtentPoint32(win32MemDc.DC, startAddr + startAt, len, ref size);
}
}
}
return(size);
}
public void TextOut(char[] textBuffer, int x, int y)
{
NativeTextWin32.TextOut(this.memHdc, x, y, textBuffer, textBuffer.Length);
}
//
public void TextOut(char[] textBuffer)
{
NativeTextWin32.TextOut(this.memHdc, 0, 0, textBuffer, textBuffer.Length);
}
internal static void MeasureCharWidths(IntPtr hFont,
out int[] charWidths,
out NativeTextWin32.FontABC[] abcSizes)
{
//only in ascii range
//current version
charWidths = new int[MAX_CODEPOINT_NO + 1]; //
MyWin32.SelectObject(win32MemDc.DC, hFont);
unsafe
{
//see: https://msdn.microsoft.com/en-us/library/ms404377(v=vs.110).aspx
//A code page contains 256 code points and is zero-based.
//In most code pages, code points 0 through 127 represent the ASCII character set,
//and code points 128 through 255 differ significantly between code pages
abcSizes = new NativeTextWin32.FontABC[MAX_CODEPOINT_NO + 1];
fixed (NativeTextWin32.FontABC* abc = abcSizes)
{
NativeTextWin32.GetCharABCWidths(win32MemDc.DC, (uint)0, (uint)MAX_CODEPOINT_NO, abc);
}
for (int i = 0; i < (MAX_CODEPOINT_NO + 1); ++i)
{
charWidths[i] = abcSizes[i].Sum;
}
}
}
