import android.opengl.ETC1; //導入方法依賴的package包/類

/**

* Create a new ETC1Texture from an input stream containing a PKM formatted compressed texture.

* @param input an input stream containing a PKM formatted compressed texture.

* @return an ETC1Texture read from the input stream.

* @throws IOException

*/

public static ETC1Texture createTexture(InputStream input) throws IOException {

int width = 0;

int height = 0;

byte[] ioBuffer = new byte[4096];

{

if (input.read(ioBuffer, 0, ETC1.ETC_PKM_HEADER_SIZE) != ETC1.ETC_PKM_HEADER_SIZE) {

throw new IOException("Unable to read PKM file header.");

}

ByteBuffer headerBuffer = ByteBuffer.allocateDirect(ETC1.ETC_PKM_HEADER_SIZE)

.order(ByteOrder.nativeOrder());

headerBuffer.put(ioBuffer, 0, ETC1.ETC_PKM_HEADER_SIZE).position(0);

if (!ETC1.isValid(headerBuffer)) {

throw new IOException("Not a PKM file.");

}

width = ETC1.getWidth(headerBuffer);

height = ETC1.getHeight(headerBuffer);

}

int encodedSize = ETC1.getEncodedDataSize(width, height);

ByteBuffer dataBuffer = ByteBuffer.allocateDirect(encodedSize).order(ByteOrder.nativeOrder());

for (int i = 0; i < encodedSize; ) {

int chunkSize = Math.min(ioBuffer.length, encodedSize - i);

if (input.read(ioBuffer, 0, chunkSize) != chunkSize) {

throw new IOException("Unable to read PKM file data.");

}

dataBuffer.put(ioBuffer, 0, chunkSize);

i += chunkSize;

}

dataBuffer.position(0);

return new ETC1Texture(width, height, dataBuffer);

}

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