private void ParseBitmap(ByteStream stream, CreateArgs createArgs)
{
if ((stream.ReadString(3) != "BM ") || (stream.ReadByte() != 0x1e)){
throw new InvalidDataException("Not a BM file.");
}
Header header = ReadHeader(stream, EHeaderType.FileHeader);
DebugCheck.Assert(stream.Position == 32);
if ((header.W == 1) && (header.H != 1)) {
// multiple bitmaps in this file.
_fps = stream.ReadByte();
stream.Skip(1);
long baseOfs = stream.Position;
int[] offsets = new int[header.IY];
for (int i = 0; i < offsets.Length; ++i) {
offsets[i] = stream.ReadLittleInt32();
}
for (int i = 0; i < offsets.Length; ++i) {
stream.SeekSet(offsets[i] + baseOfs);
Header subHeader = ReadHeader(stream, EHeaderType.SubHeader);
Frame frame = ReadColumns(stream, subHeader, null, createArgs);
_frames.Add(frame);
}
} else {
int[] columnOffsets = null;
if (header.Compressed != 0) {
// read column offsets.
stream.SeekSet(header.DataSize);
columnOffsets = new int[header.W];
for (int i = 0; i < columnOffsets.Length; ++i) {
columnOffsets[i] = stream.ReadLittleInt32() + 32;
}
}
Frame frame = ReadColumns(stream, header, columnOffsets, createArgs);
_frames.Add(frame);
}
}
public static Frame ReadColumns(ByteStream stream, Header header, int[] columnOffsets, CreateArgs createArgs)
{
try {
Texture2D texture = new Texture2D(header.W, header.H, createArgs.TextureFormat, createArgs.bMipmap, false);
texture.anisoLevel = createArgs.AnisoLevel;
texture.filterMode = createArgs.FilterMode;
texture.wrapMode = createArgs.WrapMode;
Color32[] pixels = new Color32[header.W*header.H];
byte[] column = new byte[header.H];
bool bIsTransparent = (header.Transparent & 0x8) != 0;
for (int x = 0; x < header.W; ++x) {
if (columnOffsets != null) {
stream.SeekSet(columnOffsets[x]);
}
DecodeColumn(stream, column, header.Compressed);
if (createArgs.TextureFormat == TextureFormat.Alpha8) {
int pixelOfs = x;
for (int y = 0; y < header.H; ++y, pixelOfs += header.W) {
byte color = column[y];
pixels[pixelOfs] = new Color32(color, color, color, color);
}
} else {
int pixelOfs = x;
for (int y = 0; y < header.H; ++y, pixelOfs += header.W) {
byte color = column[y];
if (bIsTransparent && (color == 0)) {
pixels[pixelOfs] = PAL.Transparent;
} else {
pixels[pixelOfs] = createArgs.Pal.Colors[color];
}
}
}
}
texture.SetPixels32(pixels);
texture.Apply();
return new Frame(texture, bIsTransparent);
} catch (UnityException e) {
throw e;
}
}
string GetChunkType(ByteStream stream)
{
long pos = stream.Position;
string type = stream.ReadString(4);
stream.SeekSet(pos);
return type;
}