//高速绘制Bitmap，不进行裁剪，图片宽、高分别是W、H的整数倍
public unsafe Bitmap DrawAllWithoutCrop(RGBPalette rgb)
{
//width、height不一定能被64整除
int W = (width >> 6) + ((width & 63) != 0 ? 1 : 0);
int H = (height >> 6) + ((height & 63) != 0 ? 1 : 0);
Bitmap bmp = new Bitmap(W * 64, H * 64, PixelFormat.Format32bppArgb);
BitmapData bmpdata = bmp.LockBits(new Rectangle(0, 0, W * 64, H * 64), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
IntPtr ptr = bmpdata.Scan0; //Bitmap象素指针
int pitch = bmpdata.Stride / 4; //一行多少个象素,而不是一行多少字节!
//依次绘制每一个64*64图块
for (int h = 0; h < H; h++)
{
for (int w = 0; w < W; w++)
{
int *line = (int *)ptr + h * 64 * pitch + w * 64; //定位block
Block b = blocks[h, w];
if (b == null) //用粉红色绘制所有的null block
{
int pink = Color.Fuchsia.ToArgb();
for (int y = 0; y < 64; y++, line += pitch)
{
for (int x = 0; x < 64; x++)
{
line[x] = pink; //粉色填充
}
}
}
else
{
//依次绘制每一个8*8子图块
for (int sh = 0; sh < 8; sh++)
{
for (int sw = 0; sw < 8; sw++)
{
SubBlock sb = b.subs[sh, sw];
int * p = line + sh * 8 * pitch + sw * 8; //定位subblock
//依次绘制8*8子图块中的每一个象素
for (int y = 0; y < 8; y++, p += pitch)
{
for (int x = 0; x < 8; x++)
{
p[x] = (int)rgb.RGB32[sb.pixels[y, x]];
}
}
}
}
}
}
}
bmp.UnlockBits(bmpdata);
return(bmp);
}
long address; //64*64图块在Y64文件中的起始位置
public Block(BinaryReader br, long address)
{
this.address = address;
br.BaseStream.Seek(address, SeekOrigin.Begin);
//跳过Seperator，它不一定是0xffffffffffffffff!
br.BaseStream.Seek(8, SeekOrigin.Current);
subs = new SubBlock[8, 8];
for (int h = 0; h < 8; h++)
{
for (int w = 0; w < 8; w++)
{
//依次计算各8*8子图块的起始位置，并生成各子图块
long off = address + 8 + 56 * (h * 8 + w); //每个subblock长56字节
subs[h, w] = new SubBlock(br, off);
}
}
}