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Improved "speed" of the ApplyBlur by using "static final readonly" for the FieldInfo to get the private field and improved stability by using finally to cleanup. (as it should be)

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git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@2490 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4
This commit is contained in:
RKrom 2013-02-15 13:35:15 +00:00
parent 0408c755d6
commit 9f86db6828
1 changed files with 42 additions and 21 deletions
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63
GreenshotPlugin/UnmanagedHelpers/GDIplus.cs
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@ -51,6 +51,8 @@ namespace GreenshotPlugin.UnmanagedHelpers {
/// GDIplus Helpers
/// </summary>
public static class GDIplus {
private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(GDIplus));
[DllImport("gdiplus.dll", SetLastError = true, ExactSpelling = true, CharSet = CharSet.Unicode)]
private static extern int GdipBitmapApplyEffect(IntPtr bitmap, IntPtr effect, ref RECT rectOfInterest, bool useAuxData, IntPtr auxData, int auxDataSize);
[DllImport("gdiplus.dll", SetLastError = true, ExactSpelling = true, CharSet = CharSet.Unicode)]
@ -61,17 +63,16 @@ namespace GreenshotPlugin.UnmanagedHelpers {
private static extern int GdipDeleteEffect(IntPtr effect);
private static Guid BlurEffectGuid = new Guid("{633C80A4-1843-482B-9EF2-BE2834C5FDD4}");
internal static TResult GetPrivateField<TResult>(object obj, string fieldName) {
if (obj == null) {
return default(TResult);
}
Type ltType = obj.GetType();
FieldInfo lfiFieldInfo = ltType.GetField( fieldName,System.Reflection.BindingFlags.GetField |System.Reflection.BindingFlags.Instance |System.Reflection.BindingFlags.NonPublic);
if (lfiFieldInfo != null) {
return (TResult)lfiFieldInfo.GetValue(obj);
} else {
throw new InvalidOperationException(string.Format("Instance field '{0}' could not be located in object of type '{1}'.",fieldName, obj.GetType().FullName));
}
// Constant "FieldInfo" for getting the nativeImage from the image
private static readonly FieldInfo FIELD_INFO_NATIVE_IMAGE = typeof(Bitmap).GetField("nativeImage", BindingFlags.GetField | BindingFlags.Instance | BindingFlags.NonPublic);
/// <summary>
/// Get the nativeImage field from the bitmap
/// </summary>
/// <param name="bitmap"></param>
/// <returns></returns>
private static IntPtr GetNativeImage(Bitmap bitmap) {
return (IntPtr)FIELD_INFO_NATIVE_IMAGE.GetValue(bitmap);
}
/// <summary>
@ -85,29 +86,49 @@ namespace GreenshotPlugin.UnmanagedHelpers {
if (Environment.OSVersion.Version.Major < 6) {
return false;
}
IntPtr hBlurParams = IntPtr.Zero;
IntPtr hEffect = IntPtr.Zero;
try {
// Create a BlurParams struct and set the values
BlurParams blurParams = new BlurParams();
blurParams.Radius = radius;
blurParams.ExpandEdges = false;
IntPtr hBlurParams = Marshal.AllocHGlobal(Marshal.SizeOf(blurParams));
// Allocate space in unmanaged memory
hBlurParams = Marshal.AllocHGlobal(Marshal.SizeOf(blurParams));
// Copy the structure to the unmanaged memory
Marshal.StructureToPtr(blurParams, hBlurParams, true);
uint paramsSize = (uint)Marshal.SizeOf(blurParams);
IntPtr hEffect = IntPtr.Zero;
// Create the GDI+ BlurEffect, using the Guid
int status = GdipCreateEffect(BlurEffectGuid, out hEffect);
GdipSetEffectParameters(hEffect, hBlurParams, paramsSize);
//IntPtr hBitmap = destinationBitmap.GetHbitmap();
IntPtr hBitmap = GetPrivateField<IntPtr>(destinationBitmap, "nativeImage");
// Set the blurParams to the effect
GdipSetEffectParameters(hEffect, hBlurParams, (uint)Marshal.SizeOf(blurParams));
// Somewhere it said we can use destinationBitmap.GetHbitmap(), this doesn't work!!
// Get the private nativeImage property from the Bitmap
IntPtr hBitmap = GetNativeImage(destinationBitmap);
// Create a RECT from the Rectangle
RECT rec = new RECT(area);
// Apply the effect to the bitmap in the specified area
GdipBitmapApplyEffect(hBitmap, hEffect, ref rec, false, IntPtr.Zero, 0);
GdipDeleteEffect(hEffect);
Marshal.FreeHGlobal(hBlurParams);
// Everything worked, return true
return true;
} catch (Exception ex) {
LOG.Error("Problem using GdipBitmapApplyEffect: ", ex);
return false;
} finally {
if (hEffect != null) {
// Delete the effect
GdipDeleteEffect(hEffect);
}
if (hBlurParams != IntPtr.Zero) {
// Free the memory
Marshal.FreeHGlobal(hBlurParams);
}
}
}
}