//private static Size GetTextExtent(
// IntPtr hdc, string text, int textLen, int maxWidth, out int fitLength, out int[] extents
//) {
// Int32 bOk;
// SIZE size;
// extents = new int[text.Length];
// unsafe {
// fixed (int* pExtents = extents)
// fixed (int* pFitLength = &fitLength)
// bOk = Gdi32PI.GetTextExtentExPointW(hdc, text, textLen, maxWidth, pFitLength, pExtents, &size);
// //Debug.Assert(bOk != 0, "failed to calculate text width");
// return new Size(size.cx, size.cy);
// }
//}
private static Size GetTextExtent(
IntPtr hdc, string text, int textLen, int maxWidth, out int fitLength, out int[] extents
)
{
SIZE size;
extents = new int[text.Length];
var result = Gdi32PI.GetTextExtentExPointW(hdc, text, textLen, maxWidth, out fitLength, extents, out size);
return(new Size(size.cx, size.cy));
}
// ========================================
// constructor
// ========================================
public Gdi32NullGraphics()
{
_hdc = Gdi32PI.CreateCompatibleDC(IntPtr.Zero);
if (_hdc == IntPtr.Zero)
{
ExceptionUtil.ThrowOnWin32Error("CreateCompatibleDC returned NULL");
}
_graphics = Graphics.FromHdc(_hdc);
}
public static void CopyGraphics(Graphics tgtGra, Rectangle tgtRect, Graphics srcGra, Point srcLoc)
{
var srcHdc = srcGra.GetHdc();
var tgtHdc = tgtGra.GetHdc();
try {
Gdi32PI.BitBlt(
tgtHdc, tgtRect.X, tgtRect.Y, tgtRect.Width, tgtRect.Height, srcHdc, srcLoc.X, srcLoc.Y, TernaryRasterOperations.SRCCOPY
);
} finally {
srcGra.ReleaseHdc(srcHdc);
tgtGra.ReleaseHdc(tgtHdc);
}
}
protected virtual void Dispose(bool disposing)
{
if (_hOldFont != IntPtr.Zero)
{
Gdi32PI.SelectObject(_hdc, _hOldFont);
}
if (_hfont != IntPtr.Zero)
{
Gdi32PI.DeleteObject(_hfont);
}
TextAlignMode = _oldAlignMode;
_graphics.ReleaseHdc(_hdc);
_graphics = null;
}
private void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
_graphics.Dispose();
_graphics = null;
}
Gdi32PI.DeleteDC(_hdc);
_disposed = true;
}
}
// ========================================
// method
// ========================================
// todo: tab文字を自前で描画
public void DrawText(string text, Rectangle rect)
{
var r = new RECT()
{
left = rect.Left,
top = rect.Top,
right = rect.Right,
bottom = rect.Bottom,
};
if (
!Gdi32PI.ExtTextOutW(
_hdc,
rect.Left,
rect.Top,
ExtTextOutFormatOptions.ETO_NONE,
ref r,
text,
text.Length,
null
)
)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
//var flags =
// DRAWTEXTFORMATS.DT_LEFT | DRAWTEXTFORMATS.DT_TOP | DRAWTEXTFORMATS.DT_TABSTOP | //DRAWTEXTFORMATS.DT_NOCLIP |
// DRAWTEXTFORMATS.DT_NOPREFIX | DRAWTEXTFORMATS.DT_SINGLELINE;
//var paras = new DRAWTEXTPARAMS();
//paras.CalcCbSize();
//paras.iTabLength = 4;
//paras.iLeftMargin = paras.iRightMargin = 0;
//User32PI.DrawTextExW(
// _hdc,
// text,
// text.Length,
// ref r,
// flags,
// ref paras
//);
}
// ========================================
// constructor
// ========================================
public Gdi32TextRenderer(Graphics g)
{
_graphics = g;
_hdc = _graphics.GetHdc();
_oldAlignMode = Gdi32PI.GetTextAlign(_hdc);
}