public static void VerifyIndexedPaletteSizeDoesNotExceedBitCount(ushort bitCount, int paletteSize)
{
if (paletteSize > ImageHeader.CalcMaxIndexedPaletteSize(bitCount))
{
throw new System.Exception("Too many colors listed on the indexed palette");
}
}
/// <summary>
/// Create default indexed bitmap with palette.
/// </summary>
public BitmapFile(ushort bitCount, uint width, int height, Color[] palette) : this(bitCount, width, height)
{
if (palette.Length > 1 << bitCount)
{
throw new System.Exception("Unable to create bitmap. Provided palette length is greater than provided bit count.");
}
// Expand palette, if needed
int maxSize = ImageHeader.CalcMaxIndexedPaletteSize(bitCount);
if (palette.Length != maxSize)
{
Color[] newPalette = new Color[maxSize];
System.Array.Copy(palette, newPalette, palette.Length < newPalette.Length ? palette.Length : newPalette.Length);
palette = newPalette;
}
// Create headers
int pixelOffset = BmpHeader.SizeInBytes + ImageHeader.SizeInBytes + palette.Length * Color.SizeInBytes;
int fileSize = pixelOffset + ImageHeader.CalculatePitch(bitCount, (int)width) * System.Math.Abs(height);
bmpHeader = BmpHeader.Create((uint)fileSize, (uint)pixelOffset);
imageHeader = ImageHeader.Create((int)width, height, bitCount);
// Store data
this.palette = palette;
}
private void WriteIndexed(BinaryWriter seekableWriter, ushort bitCount, int width, int height, Color[] palette, byte[] indexedPixels)
{
VerifyIndexedImageForSerialization(bitCount);
VerifyIndexedPaletteSizeDoesNotExceedBitCount(bitCount, palette.Length);
VerifyPixelSizeMatchesImageDimensionsWithPitch(bitCount, width, height, indexedPixels.Length);
int maxSize = ImageHeader.CalcMaxIndexedPaletteSize(bitCount);
if (palette.Length != maxSize)
{
Color[] newPalette = new Color[maxSize];
System.Array.Copy(palette, newPalette, palette.Length < newPalette.Length ? palette.Length : newPalette.Length);
palette = newPalette;
}
WriteHeaders(seekableWriter, bitCount, width, height, palette);
for (int i = 0; i < palette.Length; ++i)
{
palette[i].Serialize(seekableWriter);
}
WritePixels(seekableWriter, indexedPixels, width, height, bitCount);
}
/// <summary>
/// Create default indexed bitmap.
/// </summary>
public BitmapFile(ushort bitCount, uint width, int height)
{
VerifyIndexedImageForSerialization(bitCount);
// Create headers and default palette
imageHeader = ImageHeader.Create((int)width, (int)height, bitCount);
palette = new Color[imageHeader.CalcMaxIndexedPaletteSize()];
pixels = new byte[imageHeader.CalculatePitch() * System.Math.Abs(height)];
int pixelOffset = BmpHeader.SizeInBytes + ImageHeader.SizeInBytes + palette.Length * Color.SizeInBytes;
int bitmapFileSize = pixelOffset + pixels.Length * sizeof(byte);
//if (bitmapFileSize > uint.MaxValue) {
// throw new System.Exception("Maximum size of a bitmap file has been exceeded");
//}
bmpHeader = BmpHeader.Create((uint)bitmapFileSize, (uint)pixelOffset);
}