internal static PVRTCTexHeader Read(BinaryReader br)
{
var h = new PVRTCTexHeader();
h.headerLength = br.ReadInt32();
h.height = br.ReadInt32();
h.width = br.ReadInt32();
h.numMipmaps = br.ReadInt32();
h.flags = br.ReadInt32();
h.dataLength = br.ReadInt32();
h.bpp = br.ReadInt32();
h.bitmaskRed = br.ReadInt32();
h.bitmaskGreen = br.ReadInt32();
h.bitmaskBlue = br.ReadInt32();
h.bitmaskAlpha = br.ReadInt32();
h.pvrTag = br.ReadInt32();
h.numSurfs = br.ReadInt32();
return(h);
}
internal static PVRTCTexHeader Read( BinaryReader br )
{
var h = new PVRTCTexHeader();
h.headerLength = br.ReadInt32();
h.height = br.ReadInt32();
h.width = br.ReadInt32();
h.numMipmaps = br.ReadInt32();
h.flags = br.ReadInt32();
h.dataLength = br.ReadInt32();
h.bpp = br.ReadInt32();
h.bitmaskRed = br.ReadInt32();
h.bitmaskGreen = br.ReadInt32();
h.bitmaskBlue = br.ReadInt32();
h.bitmaskAlpha = br.ReadInt32();
h.pvrTag = br.ReadInt32();
h.numSurfs = br.ReadInt32();
return h;
}
public override Codec.DecodeResult Decode(Stream input)
{
using (var br = new BinaryReader(input))
{
var numFaces = 1; // Assume one face until we know otherwise
var imgData = new ImageData();
// Read the PVRTC header
var header = PVRTCTexHeader.Read(br);
// Get the file type identifier
var pvrTag = header.pvrTag;
if (this.PVR_MAGIC != pvrTag)
{
throw new AxiomException("This is not a PVR file!");
}
// Get format flags
var flags = header.flags;
using (var wrap = BufferBase.Wrap(flags, 2))
{
_flipEndian(wrap, sizeof(int));
}
var formatFlags = flags & PVR_TEXTURE_FLAG_TYPE_MASK;
var bitmaskAlpha = header.bitmaskAlpha;
using (var wrap = BufferBase.Wrap(bitmaskAlpha, 2))
{
_flipEndian(wrap, sizeof(int));
}
if (formatFlags == kPVRTextureFlagTypePVRTC_4 || formatFlags == kPVRTextureFlagTypePVRTC_2)
{
if (formatFlags == kPVRTextureFlagTypePVRTC_4)
{
imgData.format = bitmaskAlpha != 0 ? PixelFormat.PVRTC_RGBA4 : PixelFormat.PVRTC_RGB4;
}
else if (formatFlags == kPVRTextureFlagTypePVRTC_2)
{
imgData.format = bitmaskAlpha != 0 ? PixelFormat.PVRTC_RGBA2 : PixelFormat.PVRTC_RGB2;
}
imgData.depth = 1;
imgData.width = header.width;
imgData.height = header.height;
imgData.numMipMaps = header.numMipmaps;
// PVRTC is a compressed format
imgData.flags |= ImageFlags.Compressed;
}
// Calculate total size from number of mipmaps, faces and size
imgData.size = Image.CalculateSize(imgData.numMipMaps, numFaces, imgData.width, imgData.height, imgData.depth,
imgData.format);
// Now deal with the data
var dest = br.ReadBytes(imgData.size);
return(new DecodeResult(new MemoryStream(dest), imgData));
}
}
