//----------------------------------------------------------------
/** \brief Given an instance (of a subclass) of ImageData, construct
* and return a clone of it.
*
* Note that this static function returns the appropriate subclass of
* ImageData depending upon the type of image data (color or gray).
*
* \param other is the object to clone
* \returns an instance of the ImageData class (actually the correct
* subclass of ImageData because ImageData is abstract)
*/
static public ImageData clone(ImageData other)
{
if (other is GrayImageData)
{
GrayImageData copy = new GrayImageData(other.mOriginalData, other.mW, other.mH);
copy.mIsAudio = other.mIsAudio;
copy.mRate = other.mRate;
return(copy);
}
if (other is ColorImageData)
{
ColorImageData copy = new ColorImageData(other.mOriginalData, other.mW, other.mH);
copy.mIsAudio = other.mIsAudio;
copy.mRate = other.mRate;
return(copy);
}
return(null);
}
//----------------------------------------------------------------
/** \brief Given the name of an input image file, this method
* determines the type of image and then invokes the appropriate
* constructor.
*
* Note that this static function returns the appropriate subclass of
* ImageData depending upon the type of image data (color or gray).
*
* \param fileName name of input image file
* \returns an instance of the ImageData class (actually the correct
* subclass of ImageData because ImageData is abstract)
*/
static public ImageData load(String fileName)
{
Timer t = new Timer();
ImageData id = null;
String up = fileName.ToUpper();
if (up.EndsWith(".PPM") || up.EndsWith(".PNM") || up.EndsWith(".PGM"))
{
//technique (trick? kludge?) to implement pass-by-reference
int w, h, spp, min, max;
int[] originalData = pnmHelper.read_pnm_file(fileName, out w, out h, out spp, out min, out max);
t.print();
if (max > 255)
{
MessageBox.Show("Warning:\n\nMax value of " + max + " exceeds limit of 255.");
}
if (min < 0)
{
MessageBox.Show("Warning:\n\nMin value of " + min + " is less than 0.");
}
if (spp == 3)
{
id = new ColorImageData(originalData, w, h);
id.mFname = fileName;
Console.WriteLine(id);
return(id);
}
if (spp == 1)
{
id = new GrayImageData(originalData, w, h);
id.mFname = fileName;
Console.WriteLine(id);
return(id);
}
MessageBox.Show("Error:\n\n Cannot read this file!");
return(null);
}
if (up.EndsWith(".WAV"))
{
//basically treat audio wave files like 2d gray files (which are probably wide but not very high)
int w, h, min, max, sampleRate;
int[] originalData = wavHelper.read(fileName, out w, out h, out min, out max, out sampleRate);
t.print();
if (max > 255)
{
MessageBox.Show("Warning:\n\nMax value of " + max + " exceeds limit of 255.");
}
if (min < 0)
{
MessageBox.Show("Warning:\n\nMin value of " + min + " is less than 0.");
}
id = new GrayImageData(originalData, w, h);
id.mFname = fileName;
id.mIsAudio = true;
id.mRate = sampleRate;
Console.WriteLine(id);
return(id);
}
//here for image file types such as gif, jpg, bmp, etc. (but not ppm, pnm, pgm, or wav).
//see http://www.bobpowell.net/lockingbits.htm for description of Bitmap pixel access.
Bitmap bm = (Bitmap)Bitmap.FromFile(fileName, false);
t.print();
switch (bm.PixelFormat)
{
case PixelFormat.Format1bppIndexed:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format1bppIndexed.");
break;
case PixelFormat.Format4bppIndexed:
case PixelFormat.Format8bppIndexed:
if (bm.PixelFormat == PixelFormat.Format4bppIndexed)
{
MessageBox.Show("Caution!\n\n This hasn't been tested on 4 bpp indexed images.");
}
//this is a bit tricky. each scalar value in the image is used as an index
// into a table (Palette). Palette entries are rgb but if r==g==b, then this is
// actually gray data. so let's first deteremine if this is color or gray.
bool isGray = true;
for (int i = 0; i < bm.Palette.Entries.Length; i++)
{
Color c = bm.Palette.Entries[i];
if (c.R == c.G && c.G == c.B)
{
continue;
}
isGray = false;
break;
}
int bpp = 0;
if (bm.PixelFormat == PixelFormat.Format8bppIndexed)
{
bpp = 8;
}
else if (bm.PixelFormat == PixelFormat.Format4bppIndexed)
{
bpp = 4;
}
if (isGray)
{
id = new GrayImageData(bm, bm.Palette.Entries, bpp);
}
else
{
id = new ColorImageData(bm, bm.Palette.Entries, bpp);
}
id.mFname = fileName;
Console.WriteLine(id);
return(id);
case PixelFormat.Format16bppGrayScale:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format16bppGrayScale.");
break;
case PixelFormat.Format16bppRgb555:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format16bppRgb555.");
break;
case PixelFormat.Format16bppRgb565:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format16bppRgb565.");
break;
case PixelFormat.Format24bppRgb:
case PixelFormat.Format32bppRgb:
id = new ColorImageData(bm);
id.mFname = fileName;
Console.WriteLine(id);
return(id);
case PixelFormat.Format48bppRgb:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format48bppRgb.");
break;
case PixelFormat.Format16bppArgb1555:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format16bppArgb1555.");
break;
case PixelFormat.Format32bppArgb:
id = new ColorImageData(bm);
id.mFname = fileName;
Console.WriteLine(id);
return(id);
case PixelFormat.Format64bppArgb:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format64bppArgb.");
break;
case PixelFormat.Format32bppPArgb:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format32bppPArgb.");
break;
case PixelFormat.Format64bppPArgb:
MessageBox.Show("Sorry!\n\n Unsupported PixelFormat - Format64bppPArgb.");
break;
}
MessageBox.Show("Error:\n\n Cannot read this file!");
return(null);
}