public static unsafe byte[] FromBitmap(Bitmap Picture, ImageFormat Format, bool ExactSize = false)
{
if (ExactSize && ((Picture.Width % 8) != 0 || (Picture.Height % 8) != 0))
{
return(null);
}
int physicalwidth = Picture.Width;
int physicalheight = Picture.Height;
int ConvWidth = Picture.Width;
int ConvHeight = Picture.Height;
if (!ExactSize)
{
ConvWidth = 1 << (int)Math.Ceiling(Math.Log(Picture.Width, 2));
ConvHeight = 1 << (int)Math.Ceiling(Math.Log(Picture.Height, 2));
}
BitmapData d = Picture.LockBits(new Rectangle(0, 0, Picture.Width, Picture.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
uint * res = (uint *)d.Scan0;
byte[] result = new byte[ConvWidth * ConvHeight * GetBpp(Format) / 8];
int offs = 0;
switch (Format)
{
case ImageFormat.RGB8:
for (int y = 0; y < ConvHeight; y += 8)
{
for (int x = 0; x < ConvWidth; x += 8)
{
for (int i = 0; i < 64; i++)
{
int x2 = i % 8;
if (x + x2 >= physicalwidth)
{
continue;
}
int y2 = i / 8;
if (y + y2 >= physicalheight)
{
continue;
}
int pos = TileOrder[x2 % 4 + y2 % 4 * 4] + 16 * (x2 / 4) + 32 * (y2 / 4);
Color c = Color.FromArgb((int)res[(y + y2) * d.Stride / 4 + x + x2]);
result[offs + pos * 3 + 0] = c.B;
result[offs + pos * 3 + 1] = c.G;
result[offs + pos * 3 + 2] = c.R;
}
offs += 64 * 3;
}
}
break;
case ImageFormat.RGB565:
for (int y = 0; y < ConvHeight; y += 8)
{
for (int x = 0; x < ConvWidth; x += 8)
{
for (int i = 0; i < 64; i++)
{
int x2 = i % 8;
if (x + x2 >= physicalwidth)
{
continue;
}
int y2 = i / 8;
if (y + y2 >= physicalheight)
{
continue;
}
int pos = TileOrder[x2 % 4 + y2 % 4 * 4] + 16 * (x2 / 4) + 32 * (y2 / 4);
IOUtil.WriteU16LE(result, offs + pos * 2, GFXUtil.ArgbToRGB565(res[(y + y2) * d.Stride / 4 + x + x2]));
}
offs += 64 * 2;
}
}
break;
case ImageFormat.ETC1:
case ImageFormat.ETC1A4:
for (int y = 0; y < ConvHeight; y += 8)
{
for (int x = 0; x < ConvWidth; x += 8)
{
for (int i = 0; i < 8; i += 4)
{
for (int j = 0; j < 8; j += 4)
{
if (Format == ImageFormat.ETC1A4)
{
ulong alpha = 0;
int iiii = 0;
for (int xx = 0; xx < 4; xx++)
{
for (int yy = 0; yy < 4; yy++)
{
uint color = res[((y + i + yy) * (d.Stride / 4)) + x + j + xx];
uint a = color >> 24;
a >>= 4;
alpha |= (ulong)a << (iiii * 4);
iiii++;
}
}
IOUtil.WriteU64LE(result, offs, alpha);
offs += 8;
}
Color[] pixels = new Color[4 * 4];
for (int yy = 0; yy < 4; yy++)
{
for (int xx = 0; xx < 4; xx++)
{
pixels[yy * 4 + xx] = Color.FromArgb((int)res[((y + i + yy) * (d.Stride / 4)) + x + j + xx]);
}
}
IOUtil.WriteU64LE(result, offs, ETC1.GenETC1(pixels));
offs += 8;
}
}
}
}
break;
default:
throw new NotImplementedException("This format is not implemented yet.");
}
return(result);
}