|
private SelectObject ( |
||
| hDc | ||
| obj | ||
| return | ||
static WinGdiFont SetFont(RequestFont font)
{
WinGdiFont winFont = WinGdiFontSystem.GetWinGdiFont(font);
MyWin32.SelectObject(win32MemDc.DC, winFont.CachedHFont());
return(winFont);
}
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 void SetClipRect(int x, int y, int w, int h)
{
if (hRgn == IntPtr.Zero)
{
//create
hRgn = MyWin32.CreateRectRgn(0, 0, w, h);
}
MyWin32.SetRectRgn(hRgn,
x,
y,
x + w,
y + h);
MyWin32.SelectObject(memHdc, hRgn);
}
/// <summary>
/// Create a compatible memory HDC from the given HDC.<br/>
/// The memory HDC can be rendered into without effecting the original HDC.<br/>
/// The returned memory HDC and <paramref name="dib"/> must be released using <see cref="ReleaseMemoryHdc"/>.
/// </summary>
/// <param name="hdc">the HDC to create memory HDC from</param>
/// <param name="width">the width of the memory HDC to create</param>
/// <param name="height">the height of the memory HDC to create</param>
/// <param name="dib">returns used bitmap memory section that must be released when done with memory HDC</param>
/// <returns>memory HDC</returns>
public static IntPtr CreateMemoryHdc(IntPtr hdc, int width, int height, out IntPtr dib, out IntPtr ppvBits)
{
// Create a memory DC so we can work off-screen
IntPtr memoryHdc = MyWin32.CreateCompatibleDC(hdc);
MyWin32.SetBkMode(memoryHdc, 1);
// Create a device-independent bitmap and select it into our DC
var info = new Win32.BitMapInfo();
info.biSize = Marshal.SizeOf(info);
info.biWidth = width;
info.biHeight = -height;
info.biPlanes = 1;
info.biBitCount = 32;
info.biCompression = 0; // BI_RGB
dib = MyWin32.CreateDIBSection(hdc, ref info, 0, out ppvBits, IntPtr.Zero, 0);
MyWin32.SelectObject(memoryHdc, dib);
return(memoryHdc);
}
public IntPtr SetFont(IntPtr hFont)
{
return(MyWin32.SelectObject(memHdc, hFont));
}
