IT. Expert System.

public class ETC1
extends Object

See Also:

ETC1Util

• Field Summary

  Fields

  Modifier and Type	Field and Description
  static int	DECODED_BLOCK_SIZE Size in bytes of a decoded block.
  static int	ENCODED_BLOCK_SIZE Size in bytes of an encoded block.
  static int	ETC_PKM_HEADER_SIZE Size of a PKM file header, in bytes.
  static int	ETC1_RGB8_OES Accepted by the internalformat parameter of glCompressedTexImage2D.

• Constructor Summary

  Constructors

  Constructor and Description
  ETC1()

• Method Summary

  Methods

  Modifier and Type	Method and Description
  static void	decodeBlock(Buffer in, Buffer out) Decode a block of pixels.
  static void	decodeImage(Buffer in, Buffer out, int width, int height, int pixelSize, int stride) Decode an entire image.
  static void	encodeBlock(Buffer in, int validPixelMask, Buffer out) Encode a block of pixels.
  static void	encodeImage(Buffer in, int width, int height, int pixelSize, int stride, Buffer out) Encode an entire image.
  static void	formatHeader(Buffer header, int width, int height) Format a PKM header
  static int	getEncodedDataSize(int width, int height) Return the size of the encoded image data (does not include size of PKM header).
  static int	getHeight(Buffer header) Read the image height from a PKM header
  static int	getWidth(Buffer header) Read the image width from a PKM header
  static boolean	isValid(Buffer header) Check if a PKM header is correctly formatted.

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Field Detail

  • ENCODED_BLOCK_SIZE

    public static final int ENCODED_BLOCK_SIZE

    Size in bytes of an encoded block.

    See Also:

    Constant Field Values

  • DECODED_BLOCK_SIZE

    public static final int DECODED_BLOCK_SIZE

    Size in bytes of a decoded block.

    See Also:

    Constant Field Values

  • ETC_PKM_HEADER_SIZE

    public static final int ETC_PKM_HEADER_SIZE

    Size of a PKM file header, in bytes.

    See Also:

    Constant Field Values

  • ETC1_RGB8_OES

    public static final int ETC1_RGB8_OES

    Accepted by the internalformat parameter of glCompressedTexImage2D.

    See Also:

    Constant Field Values

• Constructor Detail

  • ETC1

    public ETC1()

• Method Detail

  • encodeBlock

    public static void encodeBlock(Buffer in,
                   int validPixelMask,
                   Buffer out)

    Encode a block of pixels.

    Parameters:

    in - a native order direct buffer of size DECODED_BLOCK_SIZE that represent a 4 x 4 square of 3-byte pixels in form R, G, B. Byte (3 * (x + 4 * y) is the R value of pixel (x, y).

    validPixelMask - is a 16-bit mask where bit (1 << (x + y * 4)) indicates whether the corresponding (x,y) pixel is valid. invalid pixel color values are ignored when compressing.

    out - a native order direct buffer of size ENCODED_BLOCK_SIZE that receives the ETC1 compressed version of the data.

  • decodeBlock

    public static void decodeBlock(Buffer in,
                   Buffer out)

    Decode a block of pixels.

    Parameters:

    in - a native order direct buffer of size ENCODED_BLOCK_SIZE that contains the ETC1 compressed version of the data.

    out - a native order direct buffer of size DECODED_BLOCK_SIZE that will receive the decoded data. The data represents a 4 x 4 square of 3-byte pixels in form R, G, B. Byte (3 * (x + 4 * y) is the R value of pixel (x, y).

  • getEncodedDataSize

    public static int getEncodedDataSize(int width,
                         int height)

    Return the size of the encoded image data (does not include size of PKM header).

  • encodeImage

    public static void encodeImage(Buffer in,
                   int width,
                   int height,
                   int pixelSize,
                   int stride,
                   Buffer out)

    Encode an entire image.

    Parameters:

    in - a native order direct buffer of the image data. Formatted such that pixel (x,y) is at pIn + pixelSize * x + stride * y;

    out - a native order direct buffer of the encoded data. Must be large enough to store entire encoded image.

    pixelSize - must be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image.

  • decodeImage

    public static void decodeImage(Buffer in,
                   Buffer out,
                   int width,
                   int height,
                   int pixelSize,
                   int stride)

    Decode an entire image.

    Parameters:

    in - native order direct buffer of the encoded data.

    out - native order direct buffer of the image data. Will be written such that pixel (x,y) is at pIn + pixelSize * x + stride * y. Must be large enough to store entire image.

    pixelSize - must be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image.

  • formatHeader

    public static void formatHeader(Buffer header,
                    int width,
                    int height)

    Format a PKM header

    Parameters:

    header - native order direct buffer of the header.

    width - the width of the image in pixels.

    height - the height of the image in pixels.

  • isValid

    public static boolean isValid(Buffer header)

    Check if a PKM header is correctly formatted.

    Parameters:

    header - native order direct buffer of the header.

  • getWidth

    public static int getWidth(Buffer header)

    Read the image width from a PKM header

    Parameters:

    header - native order direct buffer of the header.

  • getHeight

    public static int getHeight(Buffer header)

    Read the image height from a PKM header

    Parameters:

    header - native order direct buffer of the header.