/// <summary>
/// Apply filter to an image
/// </summary>
///
/// <param name="imageData">Source image to apply filter to</param>
///
/// <returns>Returns filter's result obtained by applying the filter to
/// the source image</returns>
///
/// <remarks>The filter accepts birmap data as input and returns the result
/// of image processing filter as new image. The source image data are kept
/// unchanged.</remarks>
///
public Bitmap Apply(BitmapData imageData)
{
// get mask dimension
int width = mask.Width;
int height = mask.Height;
// check source image size
if ((width != imageData.Width) || (height != imageData.Height))
{
// sorry, but source image must have the same dimension as mask image
throw new ArgumentException("Source image has wrong dimension (does not equal to mask dimension");
}
// apply first filter
Bitmap dstImg1 = filter1.Apply(imageData);
// check dimension of the result image
if ((width != dstImg1.Width) || (height != dstImg1.Height))
{
dstImg1.Dispose( );
// we are not handling such situations yet
throw new ApplicationException("Filters should not change image dimension");
}
Bitmap dstImg2 = null;
// apply second filter, if it was specified
if (filter2 != null)
{
dstImg2 = filter2.Apply(imageData);
// check dimension of the result image
if ((width != dstImg2.Width) || (height != dstImg2.Height))
{
dstImg1.Dispose( );
dstImg2.Dispose( );
// we are not handling such situations yet
throw new ApplicationException("Filters should not change image dimension");
}
}
// lock second image or get source instead of it
BitmapData dstData2 = (dstImg2 == null) ? imageData :
dstImg2.LockBits(
new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly,
(dstImg2.PixelFormat == PixelFormat.Format8bppIndexed) ?
PixelFormat.Format8bppIndexed : PixelFormat.Format24bppRgb);
// check pixel formats
if (dstImg1.PixelFormat != dstData2.PixelFormat)
{
IFilter f = new GrayscaleToRGB( );
// convert 1st image to RGB format
if (dstImg1.PixelFormat == PixelFormat.Format8bppIndexed)
{
Bitmap t = f.Apply(dstImg1);
dstImg1.Dispose( );
dstImg1 = t;
}
// convert 2nd image to RGB format
if (dstData2.PixelFormat == PixelFormat.Format8bppIndexed)
{
Bitmap t = f.Apply(dstData2);
// dispose temporary image
if (dstImg2 != null)
{
dstImg2.UnlockBits(dstData2);
dstImg2.Dispose( );
}
dstImg2 = t;
// lock second image again
dstData2 = dstImg2.LockBits(
new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly,
PixelFormat.Format24bppRgb);
}
}
// lock 1st image - result image
BitmapData dstData1 = dstImg1.LockBits(
new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite, dstImg1.PixelFormat);
// lock mask bitmap data
BitmapData maskData = mask.LockBits(
new Rectangle(0, 0, width, height),
ImageLockMode.ReadOnly, mask.PixelFormat);
int pixelSize = (dstImg1.PixelFormat == PixelFormat.Format8bppIndexed) ? 1 : 3;
int offset = dstData1.Stride - width * pixelSize;
int maskInc = (mask.PixelFormat == PixelFormat.Format8bppIndexed) ? 1 : 3;
int maskOffset = maskData.Stride - width * maskInc;
// do the job
unsafe
{
byte *dst = (byte *)dstData1.Scan0.ToPointer( );
byte *src = (byte *)dstData2.Scan0.ToPointer( );
byte *m = (byte *)maskData.Scan0.ToPointer( );
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, m += maskInc)
{
if (*m != 0)
{
for (int i = 0; i < pixelSize; i++, src++, dst++)
{
*dst = *src;
}
}
else
{
src += pixelSize;
dst += pixelSize;
}
}
src += offset;
dst += offset;
m += maskOffset;
}
}
// unlock 1st image and mask
dstImg1.UnlockBits(dstData1);
mask.UnlockBits(maskData);
// dispose 2nd image
if (dstImg2 != null)
{
dstImg2.UnlockBits(dstData2);
dstImg2.Dispose( );
}
// return result image
return(dstImg1);
}
/// <summary>
/// Apply filter to an image
/// </summary>
///
/// <param name="imageData">Source image to apply filter to</param>
///
/// <returns>Returns filter's result obtained by applying the filter to
/// the source image</returns>
///
/// <remarks>The filter accepts birmap data as input and returns the result
/// of image processing filter as new image. The source image data are kept
/// unchanged.</remarks>
///
public Bitmap Apply(BitmapData imageData)
{
// get source image dimension
int width = imageData.Width;
int height = imageData.Height;
// if generator was specified, then generate a texture
// otherwise use provided texture
if (textureGenerator != null)
{
texture = textureGenerator.Generate(width, height);
}
else
{
// check existing texture
if ((texture.GetLength(0) != height) || (texture.GetLength(1) != width))
{
// sorry, but source image must have the same dimension as texture
throw new ArgumentException("Texture size does not match image size");
}
}
// apply first filter
Bitmap dstImg1 = filter1.Apply(imageData);
// check dimension of the result image
if ((width != dstImg1.Width) || (height != dstImg1.Height))
{
dstImg1.Dispose( );
// we are not handling such situations yet
throw new ApplicationException("Filters should not change image dimension");
}
Bitmap dstImg2 = null;
// apply second filter, if it was specified
if (filter2 != null)
{
dstImg2 = filter2.Apply(imageData);
// check dimension of the result image
if ((width != dstImg2.Width) || (height != dstImg2.Height))
{
dstImg1.Dispose( );
dstImg2.Dispose( );
// we are not handling such situations yet
throw new ApplicationException("Filters should not change image dimension");
}
}
// lock second image or get source instead of it
BitmapData dstData2 = (dstImg2 == null) ? imageData :
dstImg2.LockBits(
new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly,
(dstImg2.PixelFormat == PixelFormat.Format8bppIndexed) ?
PixelFormat.Format8bppIndexed : PixelFormat.Format24bppRgb);
// check pixel formats
if (dstImg1.PixelFormat != dstData2.PixelFormat)
{
IFilter f = new GrayscaleToRGB( );
// convert 1st image to RGB format
if (dstImg1.PixelFormat == PixelFormat.Format8bppIndexed)
{
Bitmap t = f.Apply(dstImg1);
dstImg1.Dispose( );
dstImg1 = t;
}
// convert 2nd image to RGB format
if (dstData2.PixelFormat == PixelFormat.Format8bppIndexed)
{
Bitmap t = f.Apply(dstData2);
// dispose temporary image
if (dstImg2 != null)
{
dstImg2.UnlockBits(dstData2);
dstImg2.Dispose( );
}
dstImg2 = t;
// lock second image again
dstData2 = dstImg2.LockBits(
new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly,
PixelFormat.Format24bppRgb);
}
}
// lock 1st image - result image
BitmapData dstData1 = dstImg1.LockBits(
new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite, dstImg1.PixelFormat);
int pixelSize = (dstData1.PixelFormat == PixelFormat.Format8bppIndexed) ? 1 : 3;
int offset = dstData1.Stride - width * pixelSize;
// do the job
unsafe
{
byte *dst = (byte *)dstData1.Scan0.ToPointer( );
byte *src = (byte *)dstData2.Scan0.ToPointer( );
if (preserveLevel != 0.0)
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++)
{
double t = texture[y, x];
for (int i = 0; i < pixelSize; i++, src++, dst++)
{
*dst = (byte)Math.Min(255.0f, (preserveLevel * *src) + (filterLevel * *dst) * t);
}
}
src += offset;
dst += offset;
}
}
else
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++)
{
double t1 = texture[y, x];
double t2 = 1 - t1;
for (int i = 0; i < pixelSize; i++, src++, dst++)
{
*dst = (byte)Math.Min(255.0f, t1 * *dst + t2 * *src);
}
}
src += offset;
dst += offset;
}
}
}
// unlock 1st image and mask
dstImg1.UnlockBits(dstData1);
// dispose 2nd image
if (dstImg2 != null)
{
dstImg2.UnlockBits(dstData2);
dstImg2.Dispose( );
}
// return result image
return(dstImg1);
}
