private static void Read24BitImage(BinaryReader aReader, BMPImage bmp)
{
int w = Mathf.Abs(bmp.info.width);
int h = Mathf.Abs(bmp.info.height);
int rowLength = ((24 * w + 31) / 32) * 4;
int count = rowLength * h;
int pad = rowLength - w * 3;
Color32[] data = bmp.imageData = new Color32[w * h];
if (aReader.BaseStream.Position + count > aReader.BaseStream.Length)
{
Debug.LogError("Unexpected end of file. (Have " + (aReader.BaseStream.Position + count) + " bytes, expected " + aReader.BaseStream.Length + " bytes)");
return;
}
int shiftR = GetShiftCount(bmp.rMask);
int shiftG = GetShiftCount(bmp.gMask);
int shiftB = GetShiftCount(bmp.bMask);
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
uint v = aReader.ReadByte() | ((uint)aReader.ReadByte() << 8) | ((uint)aReader.ReadByte() << 16);
byte r = (byte)((v & bmp.rMask) >> shiftR);
byte g = (byte)((v & bmp.gMask) >> shiftG);
byte b = (byte)((v & bmp.bMask) >> shiftB);
data[x + y * w] = new Color32(r, g, b, 255);
}
for (int i = 0; i < pad; i++)
{
aReader.ReadByte();
}
}
}
private static void Read32BitImage(BinaryReader aReader, BMPImage bmp)
{
int w = Mathf.Abs(bmp.info.width);
int h = Mathf.Abs(bmp.info.height);
Color32[] data = bmp.imageData = new Color32[w * h];
if (aReader.BaseStream.Position + w * h * 4 > aReader.BaseStream.Length)
{
Debug.LogError("Unexpected end of file.");
return;
}
int shiftR = GetShiftCount(bmp.rMask);
int shiftG = GetShiftCount(bmp.gMask);
int shiftB = GetShiftCount(bmp.bMask);
int shiftA = GetShiftCount(bmp.aMask);
byte a = 255;
for (int i = 0; i < data.Length; i++)
{
uint v = aReader.ReadUInt32();
byte r = (byte)((v & bmp.rMask) >> shiftR);
byte g = (byte)((v & bmp.gMask) >> shiftG);
byte b = (byte)((v & bmp.bMask) >> shiftB);
if (bmp.bMask != 0)
{
a = (byte)((v & bmp.aMask) >> shiftA);
}
data[i] = new Color32(r, g, b, a);
}
}
private static void ReadIndexedImageRLE8(BinaryReader aReader, BMPImage bmp)
{
int w = Mathf.Abs(bmp.info.width);
int h = Mathf.Abs(bmp.info.height);
Color32[] data = bmp.imageData = new Color32[w * h];
int x = 0;
int y = 0;
int yOffset = 0;
while (aReader.BaseStream.Position < aReader.BaseStream.Length - 1)
{
int count = (int)aReader.ReadByte();
byte d = aReader.ReadByte();
if (count > 0)
{
for (int i = count; i > 0; i--)
{
data[x++ + yOffset] = bmp.palette[d];
}
}
else
{
if (d == 0)
{
x = 0;
y += 1;
yOffset = y * w;
}
else if (d == 1)
{
break;
}
else if (d == 2)
{
x += aReader.ReadByte();
y += aReader.ReadByte();
yOffset = y * w;
}
else
{
for (int i = d; i > 0; i--)
{
data[x++ + yOffset] = bmp.palette[aReader.ReadByte()];
}
if ((d & 0x01) > 0)
{
aReader.ReadByte(); // padding (word alignment)
}
}
}
}
}
public static List <Color32> ReadPalette(BinaryReader aReader, BMPImage aBmp, bool aReadAlpha)
{
uint count = aBmp.info.nPaletteColors;
if (count == 0u)
{
count = 1u << aBmp.info.nBitsPerPixel;
}
var palette = new List <Color32>((int)count);
for (int i = 0; i < count; i++)
{
byte b = aReader.ReadByte();
byte g = aReader.ReadByte();
byte r = aReader.ReadByte();
byte a = aReader.ReadByte();
if (!aReadAlpha)
{
a = 255;
}
palette.Add(new Color32(r, g, b, a));
}
return(palette);
}
private static void ReadIndexedImage(BinaryReader aReader, BMPImage bmp)
{
int w = Mathf.Abs(bmp.info.width);
int h = Mathf.Abs(bmp.info.height);
int bitCount = bmp.info.nBitsPerPixel;
int rowLength = ((bitCount * w + 31) / 32) * 4;
int count = rowLength * h;
int pad = rowLength - (w * bitCount + 7) / 8;
Color32[] data = bmp.imageData = new Color32[w * h];
if (aReader.BaseStream.Position + count > aReader.BaseStream.Length)
{
Debug.LogError("Unexpected end of file. (Have " + (aReader.BaseStream.Position + count) + " bytes, expected " + aReader.BaseStream.Length + " bytes)");
return;
}
BitStreamReader bitReader = new BitStreamReader(aReader);
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
int v = (int)bitReader.ReadBits(bitCount);
if (v >= bmp.palette.Count)
{
Debug.LogError("Indexed bitmap has indices greater than it's color palette");
return;
}
data[x + y * w] = bmp.palette[v];
}
bitReader.Flush();
for (int i = 0; i < pad; i++)
{
aReader.ReadByte();
}
}
}
public BMPImage LoadBMP(BinaryReader aReader)
{
BMPImage bmp = new BMPImage();
if (!ReadFileHeader(aReader, ref bmp.header))
{
Debug.LogError("Not a BMP file");
return(null);
}
if (!ReadInfoHeader(aReader, ref bmp.info))
{
Debug.LogError("Unsupported header format");
return(null);
}
if (bmp.info.compressionMethod != BMPComressionMode.BI_RGB &&
bmp.info.compressionMethod != BMPComressionMode.BI_BITFIELDS &&
bmp.info.compressionMethod != BMPComressionMode.BI_ALPHABITFIELDS &&
bmp.info.compressionMethod != BMPComressionMode.BI_RLE4 &&
bmp.info.compressionMethod != BMPComressionMode.BI_RLE8
)
{
Debug.LogError("Unsupported image format: " + bmp.info.compressionMethod);
return(null);
}
long offset = 14 + bmp.info.size;
aReader.BaseStream.Seek(offset, SeekOrigin.Begin);
if (bmp.info.nBitsPerPixel < 24)
{
bmp.rMask = 0x00007C00;
bmp.gMask = 0x000003E0;
bmp.bMask = 0x0000001F;
}
if (bmp.info.compressionMethod == BMPComressionMode.BI_BITFIELDS || bmp.info.compressionMethod == BMPComressionMode.BI_ALPHABITFIELDS)
{
bmp.rMask = aReader.ReadUInt32();
bmp.gMask = aReader.ReadUInt32();
bmp.bMask = aReader.ReadUInt32();
}
if (ForceAlphaReadWhenPossible)
{
bmp.aMask = GetMask(bmp.info.nBitsPerPixel) ^ (bmp.rMask | bmp.gMask | bmp.bMask);
}
if (bmp.info.compressionMethod == BMPComressionMode.BI_ALPHABITFIELDS)
{
bmp.aMask = aReader.ReadUInt32();
}
if (bmp.info.nPaletteColors > 0 || bmp.info.nBitsPerPixel <= 8)
{
bmp.palette = ReadPalette(aReader, bmp, ReadPaletteAlpha || ForceAlphaReadWhenPossible);
}
aReader.BaseStream.Seek(bmp.header.offset, SeekOrigin.Begin);
bool uncompressed = bmp.info.compressionMethod == BMPComressionMode.BI_RGB ||
bmp.info.compressionMethod == BMPComressionMode.BI_BITFIELDS ||
bmp.info.compressionMethod == BMPComressionMode.BI_ALPHABITFIELDS;
if (bmp.info.nBitsPerPixel == 32 && uncompressed)
{
Read32BitImage(aReader, bmp);
}
else if (bmp.info.nBitsPerPixel == 24 && uncompressed)
{
Read24BitImage(aReader, bmp);
}
else if (bmp.info.nBitsPerPixel == 16 && uncompressed)
{
Read16BitImage(aReader, bmp);
}
else if (bmp.info.compressionMethod == BMPComressionMode.BI_RLE4 && bmp.info.nBitsPerPixel == 4 && bmp.palette != null)
{
ReadIndexedImageRLE4(aReader, bmp);
}
else if (bmp.info.compressionMethod == BMPComressionMode.BI_RLE8 && bmp.info.nBitsPerPixel == 8 && bmp.palette != null)
{
ReadIndexedImageRLE8(aReader, bmp);
}
else if (uncompressed && bmp.info.nBitsPerPixel <= 8 && bmp.palette != null)
{
ReadIndexedImage(aReader, bmp);
}
else
{
Debug.LogError("Unsupported file format: " + bmp.info.compressionMethod + " BPP: " + bmp.info.nBitsPerPixel);
return(null);
}
return(bmp);
}