private ColorChannel ReduceChannel(ColorChannel channel, int factor)
{
int reducedHeight = channel.GetHeight() / factor;
int reducedWidth = channel.GetWidth() / factor;
ColorChannel result = new ColorChannel(reducedWidth, reducedHeight);
for (int y = 0; y < reducedHeight; y++)
{
for (int x = 0; x < reducedWidth; x++)
{
int sum = 0;
for (int blockY = y * factor; blockY < y * factor + factor; blockY++)
{
for (int blockX = x * factor; blockX < x * factor + factor; blockX++)
{
sum += (int)channel.GetPixel(blockX, blockY);
}
}
result.SetPixel(x, y, (int)Math.Round(sum / (double)(factor * factor)));
}
}
return(result);
}
private void FillPicture()
{
for (int y = 0; y < _picture.GetHeight(); y++)
{
for (int x = 0; x < _picture.GetWidth(); x++)
{
int value;
value = (x + y * 8) % 256;
_picture.SetPixel(x, y, value);
}
}
}
private RGBImageBuilder(ColorChannel red)
{
_imageWidth = red.GetWidth();
_imageHeight = red.GetHeight();
_red = new ColorChannel(GetRealWidth(), GetRealHeight());
_green = new ColorChannel(GetRealWidth(), GetRealHeight());
_blue = new ColorChannel(GetRealWidth(), GetRealHeight());
for (int i = 0; i < red.GetHeight(); i++)
{
for (int j = 0; j < red.GetWidth(); j++)
{
_red.SetPixel(j, i, red.GetPixel(j, i));
_green.SetPixel(j, i, red.GetPixel(j, i));
_blue.SetPixel(j, i, red.GetPixel(j, i));
}
}
}
private RGBImageBuilder(Stream inputStream)
{
Stopwatch stopwatch = Stopwatch.StartNew();
BinaryReader binReader = new BinaryReader(inputStream);
try
{
ExtractMetaInformation(binReader);
InitPicture();
int x = 0;
int y = 0;
Console.WriteLine("Finished reading PPM-Header in "
+ (stopwatch.ElapsedMilliseconds / 1000d
+ " seconds"));
stopwatch.Restart();
while (binReader.PeekChar() >= 0)
{
_red.SetPixel(x, y, ReadValue(binReader));
_green.SetPixel(x, y, ReadValue(binReader));
_blue.SetPixel(x, y, ReadValue(binReader));
x++;
if (x % _imageWidth != 0)
{
continue;
}
x = 0;
y++;
}
}
catch (IOException e)
{
Console.WriteLine(e);
}
Console.WriteLine("Finished reading PPM-Body in "
+ (stopwatch.ElapsedMilliseconds / 1000d
+ " seconds"));
stopwatch.Stop();
}