/// <summary>
/// Imports a bitmap image into the file, keeping the structure based on the properties and generating mipmaps if needed. This will reset the mipmaps, requiring them to be generated again.
/// </summary>
/// <param name="gf">The GF file data</param>
/// <param name="settings">The serializer settings</param>
/// <param name="bmp">The bitmap data to import from</param>
/// <param name="generateMipmaps">Indicates if mipmaps should be generated for the image</param>
public static void ImportFromBitmap(this GF gf, OpenSpaceSettings settings, RawBitmapData bmp, bool generateMipmaps)
{
// Helper method for writing the pixel data
void WritePixelData(RawBitmapData bitmapData, long offset)
{
// Make sure the pixel format is supported
if (bitmapData.PixelFormat != PixelFormat.Format32bppArgb && bitmapData.PixelFormat != PixelFormat.Format24bppRgb)
{
throw new Exception($"The bitmap pixel format {bitmapData.PixelFormat} is not supported for importing");
}
// Get the number of bitmap channels
int bmpChannels = Image.GetPixelFormatSize(bitmapData.PixelFormat) / 8;
// Get the format
GF_Format format = gf.PixelFormat;
byte[] bmpColorData = new byte[4];
for (uint y = 0; y < bitmapData.Height; y++)
{
for (uint x = 0; x < bitmapData.Width; x++)
{
// Get the offsets for the pixel colors
var pixelOffset = (bitmapData.Width * y + x) * gf.Channels + offset;
// NOTE: We reverse the Y-axis here since the .gf images are always flipper vertically
var rawOffset = (bitmapData.Width * (bitmapData.Height - y - 1) + x) * bmpChannels;
// Get the bitmap color bytes for this pixel
bmpColorData[0] = bitmapData.PixelData[rawOffset + 0];
bmpColorData[1] = bitmapData.PixelData[rawOffset + 1];
bmpColorData[2] = bitmapData.PixelData[rawOffset + 2];
bmpColorData[3] = bmpChannels == 4 ? bitmapData.PixelData[rawOffset + 3] : (byte)255;
// Get the pixels
foreach (var b in gf.GetGfPixelBytes(format, bmpColorData))
{
gf.PixelData[pixelOffset] = b;
pixelOffset++;
}
}
}
}
// Set size
gf.Width = bmp.Width;
gf.Height = bmp.Height;
// Set the pixel count
gf.PixelCount = gf.Width * gf.Height;
// Update the mipmap count
if (generateMipmaps && gf.SupportsMipmaps(settings))
{
gf.MipmapsCount = gf.DeterminePreferredMipmapsCount();
}
else
{
gf.MipmapsCount = 0;
}
// Enumerate each mipmap size
foreach ((int Width, int Height)size in gf.GetExclusiveMipmapSizes())
{
// Get the mipmap pixel count
var count = size.Width * size.Height;
// Add to the total pixel count
gf.PixelCount += count;
}
// Create the data array
gf.PixelData = new byte[gf.Channels * gf.PixelCount];
// Set the main pixel data
WritePixelData(bmp, 0);
// Keep track of the offset
long mipmapOffset = gf.Width * gf.Height * gf.Channels;
// Generate mipmaps if available
if (gf.ExclusiveMipmapCount > 0)
{
// Get the bitmap
using Bitmap bitmap = bmp.GetBitmap();
// Generate every mipmap
foreach ((int Width, int Height)size in gf.GetExclusiveMipmapSizes())
{
// Resize the bitmap
using Bitmap resizedBmp = bitmap.ResizeImage(size.Width, size.Height, false);
// Write the mipmap
WritePixelData(new RawBitmapData(resizedBmp), mipmapOffset);
// Increase the index
mipmapOffset += size.Height * size.Width * gf.Channels;
}
}
// Update the repeat byte
gf.UpdateRepeatByte();
}