/// <summary>
/// Draw the image on the graphics with GDI+ blur effect
/// </summary>
/// <returns>false if there is no GDI+ available or an exception occured</returns>
public static bool DrawWithBlur(Graphics graphics, Bitmap image, Rectangle source, Matrix transform, ImageAttributes imageAttributes, int radius, bool expandEdges)
{
if (!isBlurPossible(radius))
{
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.Padding = radius;
blurParams.ExpandEdges = false;
// Allocate space in unmanaged memory
hBlurParams = Marshal.AllocHGlobal(Marshal.SizeOf(blurParams));
// Copy the structure to the unmanaged memory
Marshal.StructureToPtr(blurParams, hBlurParams, true);
// Create the GDI+ BlurEffect, using the Guid
int status = GdipCreateEffect(BlurEffectGuid, out hEffect);
// 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(image);
IntPtr hGraphics = GetNativeGraphics(graphics);
IntPtr hMatrix = GetNativeMatrix(transform);
IntPtr hAttributes = GetNativeImageAttributes(imageAttributes);
// Create a RECT from the Rectangle
RECTF sourceRECF = new RECTF(source);
// Apply the effect to the bitmap in the specified area
GdipDrawImageFX(hGraphics, hBitmap, ref sourceRECF, hMatrix, hEffect, hAttributes, GpUnit.UnitPixel);
// Everything worked, return true
return(true);
} catch (Exception ex) {
LOG.Error("Problem using GdipDrawImageFX: ", ex);
return(false);
} finally {
if (hEffect != null)
{
// Delete the effect
GdipDeleteEffect(hEffect);
}
if (hBlurParams != IntPtr.Zero)
{
// Free the memory
Marshal.FreeHGlobal(hBlurParams);
}
}
}
/// <summary>
/// Returns a RectangleF for a GDI Plus rectangle.
/// </summary>
/// <param name="rect">The GDI Plus rectangle to get the RectangleF for.</param>
/// <returns>A System.Drawing.RectangleF structure.</returns>
public static RectangleF ToRectangle(RECTF rect)
{
return(rect.ToRectangle());
}
private static extern int GdipDrawImageFX(IntPtr graphics, IntPtr bitmap, ref RECTF source, IntPtr matrix, IntPtr effect, IntPtr imageAttributes, GpUnit srcUnit);
/// <summary>
/// Returns a RectangleF for a GDI Plus rectangle.
/// </summary>
/// <param name="rect">The GDI Plus rectangle to get the RectangleF for.</param>
/// <returns>A System.Drawing.RectangleF structure.</returns>
public static RectangleF ToRectangle(RECTF rect)
{
return rect.ToRectangle();
}
/// <summary>
/// Draw the image on the graphics with GDI+ blur effect
/// </summary>
/// <returns>false if there is no GDI+ available or an exception occured</returns>
public static bool DrawWithBlur(Graphics graphics, Bitmap image, Rectangle source, Matrix transform, ImageAttributes imageAttributes, int radius, bool expandEdges)
{
if (!IsBlurPossible(radius))
{
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.Padding = radius;
blurParams.ExpandEdges = false;
// Allocate space in unmanaged memory
hBlurParams = Marshal.AllocHGlobal(Marshal.SizeOf(blurParams));
// Copy the structure to the unmanaged memory
Marshal.StructureToPtr(blurParams, hBlurParams, true);
// Create the GDI+ BlurEffect, using the Guid
int status = GdipCreateEffect(BlurEffectGuid, out hEffect);
// 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(image);
IntPtr hGraphics = GetNativeGraphics(graphics);
IntPtr hMatrix = GetNativeMatrix(transform);
IntPtr hAttributes = GetNativeImageAttributes(imageAttributes);
// Create a RECT from the Rectangle
RECTF sourceRECF = new RECTF(source);
// Apply the effect to the bitmap in the specified area
GdipDrawImageFX(hGraphics, hBitmap, ref sourceRECF, hMatrix, hEffect, hAttributes, GpUnit.UnitPixel);
// Everything worked, return true
return true;
}
catch (Exception ex)
{
isBlurEnabled = false;
LOG.Error("Problem using GdipDrawImageFX: ", ex);
return false;
}
finally
{
try
{
if (hEffect != IntPtr.Zero)
{
// Delete the effect
GdipDeleteEffect(hEffect);
}
if (hBlurParams != IntPtr.Zero)
{
// Free the memory
Marshal.FreeHGlobal(hBlurParams);
}
}
catch (Exception ex)
{
isBlurEnabled = false;
LOG.Error("Problem cleaning up DrawWithBlur: ", ex);
}
}
}
private static extern int GdipDrawImageFX(IntPtr graphics, IntPtr bitmap, ref RECTF source, IntPtr matrix, IntPtr effect, IntPtr imageAttributes, GpUnit srcUnit);