public IBitmap Apply(BitmapPixelData bmData)
{
int width = bmData.Width;
int height = bmData.Height;
PixelFormat dstPixelFormat = FormatTranslations[bmData.PixelFormat];
// create new image of required format
IBitmap dstImage = (dstPixelFormat == PixelFormat.Gray8) ?
Helper.CreateGrayscaleImage(width, height) :
GraphicsEngine.Current.Engine.CreateBitmap(width, height, dstPixelFormat);
// lock destination bitmap data
BitmapPixelData dstData = dstImage.LockBitmapPixelData(
BitmapLockMode.ReadWrite, dstPixelFormat);
try
{
ProcessFilter(bmData, dstData);
}
finally
{
// unlock destination images
dstImage.UnlockBitmapPixelData(dstData);
}
return(dstImage);
}
public bool IsEmptyBitmap(IBitmap bitmap, ArgbColor backgroundColor)
{
BitmapPixelData bmData = null;
try
{
bmData = bitmap.LockBitmapPixelData(BitmapLockMode.ReadOnly, PixelFormat.Rgba32);
int stride = bmData.Stride;
IntPtr Scan0 = bmData.Scan0;
int backgroundColorValue = ArgbColor.FromArgb(
backgroundColor.A,
backgroundColor.R,
backgroundColor.G,
backgroundColor.B).ToArgb();
unsafe
{
byte *p = (byte *)(void *)Scan0;
int nOffset = stride - bitmap.Width * 4;
for (int y = 0; y < bitmap.Height; ++y)
{
for (int x = 0; x < bitmap.Width; ++x)
{
byte blue = p[0];
byte green = p[1];
byte red = p[2];
byte alpha = p[3];
if (alpha != 0) // Not transparent
{
int pixelValue = ArgbColor.FromArgb(alpha, red, green, blue).ToArgb();
if (!pixelValue.Equals(backgroundColorValue))
{
return(false);
}
}
p += 4;
}
p += nOffset;
}
}
}
finally
{
if (bitmap != null && bmData != null)
{
bitmap.UnlockBitmapPixelData(bmData);
}
}
return(true);
}
public double GetStdDev(IBitmap bitmap)
{
double total = 0, totalVariance = 0;
int count = 0;
double stdDev = 0;
// First get all the bytes
BitmapPixelData bmData = null;
try
{
bmData = bitmap.LockBitmapPixelData(BitmapLockMode.ReadOnly, bitmap.PixelFormat);
int stride = bmData.Stride;
IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte *p = (byte *)(void *)Scan0;
int nOffset = stride - bitmap.Width * 3;
for (int y = 0; y < bitmap.Height; ++y)
{
for (int x = 0; x < bitmap.Width; ++x)
{
count++;
byte blue = p[0];
byte green = p[1];
byte red = p[2];
int pixelValue = ArgbColor.FromArgb(0, red, green, blue).ToArgb();
total += pixelValue;
double avg = total / count;
totalVariance += Math.Pow(pixelValue - avg, 2);
stdDev = Math.Sqrt(totalVariance / count);
p += 3;
}
p += nOffset;
}
}
}
finally
{
if (bmData != null)
{
bitmap.UnlockBitmapPixelData(bmData);
}
}
return(stdDev);
}
public IBitmap Apply(IBitmap bitmap)
{
var bmData = bitmap.LockBitmapPixelData(
BitmapLockMode.ReadWrite, bitmap.PixelFormat);
IBitmap dstImage = null;
try
{
dstImage = Apply(bmData);
if ((bitmap.DpiX > 0) && (bitmap.DpiY > 0))
{
dstImage.SetResolution(bitmap.DpiX, bitmap.DpiY);
}
}
finally
{
bitmap.UnlockBitmapPixelData(bmData);
}
return(dstImage);
}
static public Bitmap ToGdiBitmap(this IBitmap iBitmap)
{
if (iBitmap.EngineElement == null)
{
return(new Bitmap(1, 1));
}
if (iBitmap?.EngineElement is Bitmap)
{
return((Bitmap)iBitmap.EngineElement);
}
BitmapPixelData bmPixelData = null;
try
{
bmPixelData = iBitmap.LockBitmapPixelData(BitmapLockMode.Copy, PixelFormat.Rgba32);
var bm = new Bitmap(bmPixelData.Width,
bmPixelData.Height,
bmPixelData.Stride,
System.Drawing.Imaging.PixelFormat.Format32bppArgb,
bmPixelData.Scan0);
bmPixelData.Scan0 = IntPtr.Zero; // Don't give it back...
//bm.Save($"C:\\temp\\gr_{ Guid.NewGuid().ToString() }.png", System.Drawing.Imaging.ImageFormat.Png);
return(bm);
}
finally
{
if (bmPixelData != null)
{
iBitmap.UnlockBitmapPixelData(bmPixelData);
}
}
}
public void Encode(IBitmap bitmap, Stream stream, ImageFormat format, int quality = 0)
{
if (bitmap == null)
{
throw new ArgumentException("Bitmap is NULL");
}
if (bitmap.EngineElement is System.Drawing.Bitmap)
{
((System.Drawing.Bitmap)bitmap.EngineElement).Save(stream, format.ToImageFormat());
}
else
{
BitmapPixelData pixelData = null;
try
{
pixelData = bitmap.LockBitmapPixelData(BitmapLockMode.ReadWrite, bitmap.PixelFormat);
using (var bm = new System.Drawing.Bitmap(
pixelData.Width,
pixelData.Height,
pixelData.Stride,
pixelData.PixelFormat.ToGdiPixelFormat(),
pixelData.Scan0))
{
bm.Save(stream, format.ToImageFormat());
}
}
finally
{
if (pixelData != null)
{
bitmap.UnlockBitmapPixelData(pixelData);
}
}
}
}