protected Header readHeaderFromBuffer(ByteBuffer buffer) throws WWRuntimeException {
// Read file code - first byte
int fileCode = buffer.get();
if (fileCode > 5) {
String message = Logging.getMessage("SHP.NotADBaseFile", file.getPath());
Logging.logger().log(java.util.logging.Level.SEVERE, message);
throw new WWRuntimeException(message);
}
// Last update date
int yy = 0xFF & buffer.get(); // unsigned
int mm = buffer.get();
int dd = buffer.get();
// Number of records
int numRecords = buffer.getInt();
// Header struct length
int headerLength = buffer.getShort();
// Record length
int recordLength = buffer.getShort();
// Assemble header
Header header = new Header();
header.fileCode = fileCode;
Calendar cal = Calendar.getInstance();
cal.set(1900 + yy, mm - 1, dd);
header.lastModificationDate = cal.getTime();
header.numberOfRecords = numRecords;
header.headerLength = headerLength;
header.recordLength = recordLength;
return header;
}
protected Header readHeaderFromStream(InputStream is) throws IOException {
ReadableByteChannel channel = Channels.newChannel(is);
// Read header fixed portion
ByteBuffer headerBuffer = ShapefileUtils.readByteChannelToBuffer(channel, FIXED_HEADER_LENGTH);
Header header = this.readHeaderFromBuffer(headerBuffer);
// Read fields description header
int fieldsHeaderLength = header.headerLength - FIXED_HEADER_LENGTH;
header.fieldsHeaderBuffer = ShapefileUtils.readByteChannelToBuffer(channel, fieldsHeaderLength);
return header;
}
// Microsoft doesn't follow their own specifications and the
// simplest conversion using the DxTex tool to e.g. a DXT3 texture
// results in an illegal .dds file without either DDSD_PITCH or
// DDSD_LINEARSIZE set in the header's flags. This code, adapted
// from the DevIL library, fixes up the header in these situations.
private void fixupHeader() {
if (isCompressed() && !isSurfaceDescFlagSet(DDSD_LINEARSIZE)) {
// Figure out how big the linear size should be
int depth = header.backBufferCountOrDepth;
if (depth == 0) {
depth = 1;
}
header.pitchOrLinearSize =
computeCompressedBlockSize(getWidth(), getHeight(), depth, getCompressionFormat());
header.flags |= DDSD_LINEARSIZE;
}
}
public void write(FileOutputStream fos) throws IOException {
FileChannel chan = fos.getChannel();
// Create ByteBuffer for header in case the start of our
// ByteBuffer isn't actually memory-mapped
ByteBuffer hdr = ByteBuffer.allocate(Header.writtenSize());
hdr.order(ByteOrder.LITTLE_ENDIAN);
header.write(hdr);
hdr.rewind();
chan.write(hdr);
buf.position(Header.writtenSize());
chan.write(buf);
chan.force(true);
chan.close();
}
private void readFromBuffer(ByteBuffer buf) throws IOException {
this.buf = buf;
buf.order(ByteOrder.LITTLE_ENDIAN);
header = new Header();
header.read(buf);
fixupHeader();
}
/**
* Gets the <i>i</i>th mipmap data (0..getNumMipMaps() - 1)
*
* @param side Cubemap side or 0 for 2D texture
* @param map Mipmap index
* @return Image object
*/
public ImageInfo getMipMap(int side, int map) {
if (!isCubemap() && (side != 0)) {
throw new RuntimeException("Illegal side for 2D texture: " + side);
}
if (isCubemap() && !isCubemapSidePresent(side)) {
throw new RuntimeException("Illegal side, side not present: " + side);
}
if (getNumMipMaps() > 0 && ((map < 0) || (map >= getNumMipMaps()))) {
throw new RuntimeException(
"Illegal mipmap number " + map + " (0.." + (getNumMipMaps() - 1) + ")");
}
// Figure out how far to seek
int seek = Header.writtenSize();
if (isCubemap()) {
seek += sideShiftInBytes(side);
}
for (int i = 0; i < map; i++) {
seek += mipMapSizeInBytes(i);
}
buf.limit(seek + mipMapSizeInBytes(map));
buf.position(seek);
ByteBuffer next = buf.slice();
buf.position(0);
buf.limit(buf.capacity());
return new ImageInfo(
next, mipMapWidth(map), mipMapHeight(map), isCompressed(), getCompressionFormat());
}
private void initFromData(int d3dFormat, int width, int height, ByteBuffer[] mipmapData)
throws IllegalArgumentException {
// Check size of mipmap data compared against format, width and
// height
int topmostMipmapSize = width * height;
int pitchOrLinearSize = width;
boolean isCompressed = false;
switch (d3dFormat) {
case D3DFMT_R8G8B8:
topmostMipmapSize *= 3;
pitchOrLinearSize *= 3;
break;
case D3DFMT_A8R8G8B8:
topmostMipmapSize *= 4;
pitchOrLinearSize *= 4;
break;
case D3DFMT_X8R8G8B8:
topmostMipmapSize *= 4;
pitchOrLinearSize *= 4;
break;
case D3DFMT_DXT1:
case D3DFMT_DXT2:
case D3DFMT_DXT3:
case D3DFMT_DXT4:
case D3DFMT_DXT5:
topmostMipmapSize = computeCompressedBlockSize(width, height, 1, d3dFormat);
pitchOrLinearSize = topmostMipmapSize;
isCompressed = true;
break;
default:
throw new IllegalArgumentException("d3dFormat must be one of the known formats");
}
// Now check the mipmaps against this size
int curSize = topmostMipmapSize;
int mipmapWidth = width;
int mipmapHeight = height;
int totalSize = 0;
for (int i = 0; i < mipmapData.length; i++) {
if (mipmapData[i].remaining() != curSize) {
throw new IllegalArgumentException(
"Mipmap level "
+ i
+ " didn't match expected data size (expected "
+ curSize
+ ", got "
+ mipmapData[i].remaining()
+ ")");
}
/* Change Daniel Senff
* I got the problem, that MipMaps below the dimension of 8x8 blocks with DXT5
* where assume smaller than they are created.
* Assumed: < 16byte where 16byte where used by the compression. */
if (isCompressed) {
// size calculation for compressed mipmaps
if (mipmapWidth > 1) mipmapWidth /= 2;
if (mipmapHeight > 1) mipmapHeight /= 2;
curSize = computeCompressedBlockSize(mipmapWidth, mipmapHeight, 1, d3dFormat);
} else {
curSize /= 4;
}
totalSize += mipmapData[i].remaining();
}
// OK, create one large ByteBuffer to hold all of the mipmap data
totalSize += Header.writtenSize();
ByteBuffer buf = ByteBuffer.allocate(totalSize);
buf.position(Header.writtenSize());
for (int i = 0; i < mipmapData.length; i++) {
buf.put(mipmapData[i]);
}
this.buf = buf;
// Allocate and initialize a Header
header = new Header();
header.size = Header.size();
header.flags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT;
if (mipmapData.length > 1) {
header.flags |= DDSD_MIPMAPCOUNT;
header.mipMapCountOrAux = mipmapData.length;
}
header.width = width;
header.height = height;
if (isCompressed) {
header.flags |= DDSD_LINEARSIZE;
header.pfFlags |= DDPF_FOURCC;
header.pfFourCC = d3dFormat;
} else {
header.flags |= DDSD_PITCH;
// Figure out the various settings from the pixel format
header.pfFlags |= DDPF_RGB;
switch (d3dFormat) {
case D3DFMT_R8G8B8:
header.pfRGBBitCount = 24;
break;
case D3DFMT_A8R8G8B8:
header.pfRGBBitCount = 32;
header.pfFlags |= DDPF_ALPHAPIXELS;
break;
case D3DFMT_X8R8G8B8:
header.pfRGBBitCount = 32;
break;
}
header.pfRBitMask = 0x00FF0000;
header.pfGBitMask = 0x0000FF00;
header.pfBBitMask = 0x000000FF;
if (d3dFormat == D3DFMT_A8R8G8B8) {
header.pfABitMask = 0xFF000000;
}
}
header.pitchOrLinearSize = pitchOrLinearSize;
header.pfSize = Header.pfSize();
// Not sure whether we can get away with leaving the rest of the
// header blank
}
