//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);
}
//以指定格式保存图片
public void SaveToFile(string fn, ImageFormat format, RGBPalette rgb)
{
Bitmap bmp = DrawAllWithCrop(rgb);
bmp.Save(fn, format);
bmp.Dispose();
//对DrawAll生成的W*64-H*64进行真实尺寸Crop，貌似代价还是很高，最好用定义的Draw来实现
//Bitmap dest = bmp.Clone(new Rectangle(0, 0, width, height), PixelFormat.Format32bppArgb);
//bmp.Dispose();
//dest.Save(fn, format);
//dest.Dispose();
}
public Y64(string fn) //ok
{
fs = new FileStream(fn, FileMode.Open, FileAccess.Read);
br = new BinaryReader(fs);
//检测Y74的6字节文件标志46 43 44 45 00 00
int id = br.ReadInt32();
Debug.Assert(id == 0x45444346);
id = br.ReadInt16();
Debug.Assert(id == 0);
//版本标志：commandos 2 or commandos 3
version = br.ReadInt16();
Debug.Assert(version >= 2 && version <= 4);
if (version > 2)
{
version = 3;
}
//获得YCrCb色板和RGB色板
if (version == 2)
{
palette = new YCrCbPalette(br, 48);
}
else
{
palette = new YCrCbPalette(br, 113);
}
rgb = new RGBPalette(palette);
//获得视角数和每视角的图片数
num_view = br.ReadInt32();
num_pic_per_view = br.ReadInt32();
//获得每一图片的起始位置
ptr_pics = new long[num_view, num_pic_per_view];
for (int i = 0; i < num_view; i++)
{
for (int j = 0; j < num_pic_per_view; j++)
{
ptr_pics[i, j] = br.ReadInt32();
}
}
}