// Mixes two colors based on their alpha value, placing this over the other color.
// Note: does not mix alpha values, simply sets the alpha to 1.0
public RGBA Mix(RGBA other)
{
this.R = this.R * this.A + other.R * other.A * (1.0 - this.A);
this.G = this.G * this.A + other.G * other.A * (1.0 - this.A);
this.B = this.B * this.A + other.B * other.A * (1.0 - this.A);
this.A = 1.0;
return this;
}
// this is color from image, color is color to replace with alpha
public RGBA ColorToAlpha(RGBA color)
{
RGBA x = new RGBA(
ChannelToAlpha(this.R, color.R),
ChannelToAlpha(this.G, color.G),
ChannelToAlpha(this.B, color.B),
this.A
);
if (x.R > x.G) this.A = (x.R > x.B) ? x.R : x.B;
else this.A = (x.G > x.B) ? x.G : x.B;
if (this.A >= 0.0001)
{
this.R = (this.R - color.R) / this.A + color.R;
this.G = (this.G - color.G) / this.A + color.G;
this.B = (this.B - color.B) / this.A + color.B;
this.A *= x.A;
}
return this;
}
static int Main(string[] args)
{
if (args.Length != 3)
{
Console.WriteLine("You need to include the background image (PNG, GIF, JPEG, EXIG, or TIFF) file, a source directory (containing all the FirstUXRes animation files), and a destination directory on the command line.");
return 1;
}
// Color to replace
RGBA black = new RGBA(0.0, 0.0, 0.0, 1.0);
// Open the background image
Bitmap bkgrnd = null;
try
{
bkgrnd = new Bitmap(args[0]);
}
catch (Exception ex)
{
Console.Error.WriteLine("There was a problem opening the background image '"+args[0]+"': "+ex.Message);
return 1;
}
// Target height and width
int width = bkgrnd.Width, height = bkgrnd.Height;
// Open the directory
DirectoryInfo dir = null;
try
{
dir = new DirectoryInfo(args[1]);
}
catch (Exception ex)
{
Console.Error.WriteLine("There was a problem opening the directory '"+args[1]+"': "+ex.Message);
return 1;
}
// Create/open destination directory
String dest = args[2];
if (File.Exists(dest))
{
Console.Error.WriteLine("The path '"+dest+"' is not a directory");
return 1;
}
else if (!Directory.Exists(dest))
{
try
{
Directory.CreateDirectory(dest);
}
catch (Exception ex)
{
Console.Error.WriteLine("There was a problem creating the directory '"+dest+"': "+ex.Message);
return 1;
}
}
// Go through each file
foreach (FileInfo fi in dir.GetFiles("*.bmp"))
{
String name = fi.FullName;
String file = Path.GetFileName(name);
try {
// Open it
Bitmap img = new Bitmap(name);
if (img.Width != width || img.Height != height) {
Console.WriteLine("Skipping '"+name+"' because it was the wrong size.");
continue;
}
// Go through each pixel
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
// Get the foreground and background colors
RGBA f = (RGBA)img.GetPixel(x, y);
RGBA b = (RGBA)bkgrnd.GetPixel(x, y);
// Convert to alpha, mix, and replace pixel
img.SetPixel(x, y, (Color)f.ColorToAlpha(black).Mix(b));
}
}
img.Save(dest+"\\"+file, System.Drawing.Imaging.ImageFormat.Bmp);
} catch (Exception ex) {
Console.Error.WriteLine("There was a problem editing the image '"+file+"': "+ex.Message);
}
}
return 0;
}
