/// <summary>
/// Converts the .gf pixel data to raw bitmap data of a specified size
/// </summary>
/// <param name="gf">The GF file data</param>
/// <param name="width">The image width</param>
/// <param name="height">The image height</param>
/// <param name="offset">The offset in the pixel array</param>
/// <returns>The raw image data</returns>
public static RawBitmapData GetRawBitmapData(this GF gf, int width, int height, int offset = 0)
{
// Check if the size is scaled
bool isScaled = gf.Width != width || gf.Height != height;
// Get the scale factors
double widthScale = gf.Width / (double)width;
double heightScale = gf.Height / (double)height;
// Get the format
GF_Format format = gf.PixelFormat;
// Get the pixel format
PixelFormat pixelFormat = format.SupportsTransparency() ? PixelFormat.Format32bppArgb : PixelFormat.Format24bppRgb;
// Get the number of bitmap channels
int bmpChannels = Image.GetPixelFormatSize(pixelFormat) / 8;
// Create the pixel array
byte[] rawPixelData = new byte[width * height * bmpChannels];
// Enumerate each pixel
for (uint y = 0; y < height; y++)
{
for (uint x = 0; x < width; x++)
{
// Get the offsets for the pixel colors
var pixelOffset = isScaled
? (long)((gf.Width * Math.Floor((y * heightScale)) + Math.Floor((x * widthScale))) * gf.Channels + offset)
: (width * y + x) * gf.Channels + offset;
// NOTE: We reverse the Y-axis here since the .gf images are always flipped vertically
long rawOffset = (width * (height - y - 1) + x) * bmpChannels;
// Get the pixels
foreach (var b in gf.GetBGRAPixel(format, gf.PixelData, pixelOffset))
{
rawPixelData[rawOffset] = b;
rawOffset++;
}
}
}
// Return the raw bitmap data
return(new RawBitmapData(width, height, rawPixelData, pixelFormat));
}
