/// <summary>
/// Retrieve the DPI value for the supplied window handle
/// </summary>
/// <param name="hWnd">IntPtr</param>
/// <returns>dpi value</returns>
public static int GetDpi(IntPtr hWnd)
{
// Use the easiest method, but this only works for Windows 10
if (WindowsVersion.IsWindows10OrLater)
{
return(GetDpiForWindow(hWnd));
}
// Use the second easiest method, but this only works for Windows 8.1 or later
if (WindowsVersion.IsWindows81OrLater)
{
var hMonitor = User32Api.MonitorFromWindow(hWnd, MonitorFrom.DefaultToNearest);
uint dpiX;
uint dpiY;
if (GetDpiForMonitor(hMonitor, MonitorDpiType.EffectiveDpi, out dpiX, out dpiY))
{
return((int)dpiX);
}
}
// Fallback to the global DPI settings
using (var hdc = SafeDeviceContextHandle.FromHWnd(hWnd))
{
return(Gdi32Api.GetDeviceCaps(hdc, DeviceCaps.LOGPIXELSX));
}
}
/// <summary>
/// Retrieve the DPI value for the supplied window handle
/// </summary>
/// <param name="hWnd">IntPtr</param>
/// <returns>dpi value</returns>
public static uint GetDpi(IntPtr hWnd)
{
if (!User32Api.IsWindow(hWnd))
{
return(DpiHandler.DefaultScreenDpi);
}
// Use the easiest method, but this only works for Windows 10
if (WindowsVersion.IsWindows10OrLater)
{
return(GetDpiForWindow(hWnd));
}
// Use the second easiest method, but this only works for Windows 8.1 or later
if (WindowsVersion.IsWindows81OrLater)
{
var hMonitor = User32Api.MonitorFromWindow(hWnd, MonitorFrom.DefaultToNearest);
// ReSharper disable once UnusedVariable
if (GetDpiForMonitor(hMonitor, MonitorDpiType.EffectiveDpi, out var dpiX, out var dpiY))
{
return(dpiX);
}
}
// Fallback to the global DPI settings
using (var hdc = SafeDeviceContextHandle.FromHWnd(hWnd))
{
if (hdc == null)
{
return(DpiHandler.DefaultScreenDpi);
}
return((uint)Gdi32Api.GetDeviceCaps(hdc, DeviceCaps.LOGPIXELSX));
}
}
public void TestSafeDeviceContextHandle_IntPtrZero()
{
using (var safeDeviceContextHandle = SafeDeviceContextHandle.FromHWnd(IntPtr.Zero))
{
Assert.Null(safeDeviceContextHandle);
}
}
public static Bitmap getIconBits(IntPtr hIcon, int iconSize)
{
ICONINFO iconInfo;
if (GetIconInfo(hIcon, out iconInfo))
{
using (SafeDeviceContextHandle dc = SafeDeviceContextHandle.Get())
{
BITMAPINFO bmi = new BITMAPINFO();
bmi.biSize = 40;
bmi.biWidth = iconSize;
bmi.biHeight = -iconSize;
bmi.biPlanes = 1;
bmi.biBitCount = 32;
bmi.biCompression = 0;
int intArrSize = iconSize * iconSize;
int[] iconBits = new int[intArrSize];
GetDIBits(dc, iconInfo.hbmColor, 0, (uint)iconSize, iconBits, ref bmi, 0);
bool hasAlpha = false;
if (isXP)
{
for (int i = 0; i < iconBits.Length; i++)
{
if ((iconBits[i] & 0xFF000000) != 0)
{
hasAlpha = true;
break;
}
}
}
if (!hasAlpha)
{
int[] maskBits = new int[intArrSize];
GetDIBits(dc, iconInfo.hbmMask, 0, (uint)iconSize, maskBits, ref bmi, 0);
for (int i = 0; i < iconBits.Length; i++)
{
if (maskBits[i] == 0)
{
iconBits[i] = (int)((uint)iconBits[i] | 0xFF000000);
}
}
}
DeleteObject(iconInfo.hbmColor);
DeleteObject(iconInfo.hbmMask);
DeleteObject(hIcon);
Bitmap bitmap = new Bitmap(iconSize, iconSize, PixelFormat.Format32bppArgb);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, iconSize, iconSize), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
try {
Marshal.Copy(iconBits, 0, bitmapData.Scan0, iconBits.Length);
}
finally {
bitmap.UnlockBits(bitmapData);
}
return(bitmap);
}
}
return(null);
}
public static Bitmap getFileChooserBitmap()
{
if (hmodShell32 != IntPtr.Zero)
{
// Code copied from ShellFolder2.cpp Java_sun_awt_shell_Win32ShellFolder2_getFileChooserBitmapBits
// Get a handle to an icon.
SafeGdiObjectHandle hBitmap = null;
try
{
hBitmap = isVista ?
LoadImage(hmodShell32, "IDB_TB_SH_DEF_16", IMAGE_BITMAP, 0, 0, 0) :
LoadImage(hmodShell32, (IntPtr)216, IMAGE_BITMAP, 0, 0, 0);
if (hBitmap == null && hmodComctl32 != IntPtr.Zero)
{
hBitmap = LoadImage(hmodComctl32, (IntPtr)124, IMAGE_BITMAP, 0, 0, 0);
}
if (hBitmap != null)
{
BITMAPINFO bmi = new BITMAPINFO();
GetObject(hBitmap, Marshal.SizeOf(bmi), ref bmi);
int width = bmi.biWidth;
int height = bmi.biHeight;
bmi.biSize = 40;
bmi.biHeight = -bmi.biHeight;
bmi.biPlanes = 1;
bmi.biBitCount = 32;
bmi.biCompression = 0;
if (width == 0 || height == 0)
{
return(null);
}
using (SafeDeviceContextHandle dc = SafeDeviceContextHandle.Get())
{
int[] data = new int[width * height];
GetDIBits(dc, hBitmap, (uint)0, (uint)height, data, ref bmi, 0);
Bitmap bitmap = new Bitmap(data.Length / 16, 16, PixelFormat.Format32bppArgb);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
Marshal.Copy(data, 0, bitmapData.Scan0, data.Length);
bitmap.UnlockBits(bitmapData);
return(bitmap);
}
}
}
finally
{
if (hBitmap != null)
{
hBitmap.Close();
}
}
}
return(null);
}
private static int[] getIconBits(IntPtr hIcon, int iconSize)
{
ICONINFO iconInfo;
if (GetIconInfo(hIcon, out iconInfo))
{
using (SafeDeviceContextHandle dc = SafeDeviceContextHandle.Get())
{
BITMAPINFO bmi = new BITMAPINFO();
bmi.biSize = 40;
bmi.biWidth = iconSize;
bmi.biHeight = -iconSize;
bmi.biPlanes = 1;
bmi.biBitCount = 32;
bmi.biCompression = 0;
int intArrSize = iconSize * iconSize;
int[] iconBits = new int[intArrSize];
GetDIBits(dc, iconInfo.hbmColor, 0, (uint)iconSize, iconBits, ref bmi, 0);
bool hasAlpha = false;
if (isXP)
{
for (int i = 0; i < iconBits.Length; i++)
{
if ((iconBits[i] & 0xFF000000) != 0)
{
hasAlpha = true;
break;
}
}
}
if (!hasAlpha)
{
int[] maskBits = new int[intArrSize];
GetDIBits(dc, iconInfo.hbmMask, 0, (uint)iconSize, maskBits, ref bmi, 0);
for (int i = 0; i < iconBits.Length; i++)
{
if (maskBits[i] == 0)
{
iconBits[i] = (int)((uint)iconBits[i] | 0xFF000000);
}
}
}
DeleteObject(iconInfo.hbmColor);
DeleteObject(iconInfo.hbmMask);
return(iconBits);
}
}
return(null);
}
private static extern int GetDIBits(SafeDeviceContextHandle hdc, SafeGdiObjectHandle hbmp, uint uStartScan, uint cScanLines, int[] lpvBits, ref BITMAPINFO lpbmi, uint uUsage);
/// <summary>
/// Get a SafeHandle for the GetHdc, so one can use using to automatically cleanup the devicecontext
/// </summary>
/// <param name="graphics">Graphics</param>
/// <returns>SafeDeviceContextHandle</returns>
public static SafeDeviceContextHandle GetSafeDeviceContext(this Graphics graphics)
{
return(SafeDeviceContextHandle.FromGraphics(graphics));
}
private static extern int GetDIBits(SafeDeviceContextHandle hdc, SafeGdiObjectHandle hbmp, uint uStartScan, uint cScanLines, int[] lpvBits, ref BITMAPINFO lpbmi, uint uUsage);
