public void LoadPPMFile(string path)
{
FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[BUFFER_SIZE], chunk;
int bytesToRead = (int)stream.Length;
int bytesRead = 0;
int n;
LoadedPixelColor unfinishedColor = null;
cursorX = cursorY = 0;
n = stream.Read(buffer, 0, BUFFER_SIZE);
chunk = initializePPM(buffer);
try
{
if (fileFormat == Format.P3)
{
unfinishedColor = processP3Data(chunk, (P3PixelColor)unfinishedColor);
}
else
{
unfinishedColor = processP6Data(chunk, (P6PixelColor)unfinishedColor);
}
}
catch (FinishedException) { }
do
{
bytesRead += n;
bytesToRead -= n;
n = stream.Read(buffer, 0, BUFFER_SIZE);
if (n == 0)
{
break;
}
try
{
if (fileFormat == Format.P3)
{
unfinishedColor = processP3Data(buffer, (P3PixelColor)unfinishedColor);
}
else
{
unfinishedColor = processP6Data(buffer, (P6PixelColor)unfinishedColor);
}
}
catch (FinishedException) { break; }
} while (bytesToRead > 0);
stream.Close();
CreateImage();
}
public void DrawPixel(LoadedPixelColor color)
{
Int32Rect rectangle = new Int32Rect(cursorX, cursorY, 1, 1);
unsafe
{
int colorValue = color.CalculateColor();
IntPtr backBuffer = outBitmap.BackBuffer;
backBuffer += cursorY * outBitmap.BackBufferStride;
backBuffer += cursorX * 4;
*((int *)backBuffer) = colorValue;
}
outBitmap.AddDirtyRect(rectangle);
updateCursor();
}
