private void Encode_A8(byte[] bgrData)
{
if (bgrData.Length != 3 * Width * Height)
{
throw new ArgumentException("RGB Data size is invalid", nameof(bgrData));
}
var gscData = new byte[bgrData.Length];
Buffer.BlockCopy(bgrData, 0, gscData, 0, bgrData.Length);
GraphicUtils.BgrDataToGrayScale(gscData);
GraphicUtils.RotatebgrDataCounterClockwise(gscData, 3 * Width);
var p = GreatestCommonMultiple(Width, 8) / 8;
if (p == 0)
{
p = 1;
}
for (uint i = 0; i < Data.Length; i += 1)
{
uint x, y;
DecToCoord(i % 64, out x, out y);
uint tile = i / 64;
x += (uint)(tile % p) * 8;
y += (uint)(tile / p) * 8;
var idx = 3 * (y * Width + x);
var g = gscData[idx + 0];
Data[i] = g;
}
}
private byte[] Decode_A8()
{
var bgrData = new byte[Width * Height * 3];
var p = GreatestCommonMultiple(Width, 8) / 8;
if (p == 0)
{
p = 1;
}
for (uint i = 0; i < Data.Length; i += 1)
{
byte a = Data[i + 0]; // 8
uint x, y;
DecToCoord(i % 64, out x, out y);
uint tile = i / 64;
x += (uint)(tile % p) * 8;
y += (uint)(tile / p) * 8;
var idx = 3 * (y * Width + x);
bgrData[idx + 0] = a;
bgrData[idx + 1] = a;
bgrData[idx + 2] = a;
}
GraphicUtils.RotatebgrDataClockwise(bgrData, 3 * Width);
return(bgrData);
}