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Summary: 

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Method

Detail: 

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Method

org.libjpegturbo.turbojpeg

Class TJ

java.lang.Object

org.libjpegturbo.turbojpeg.TJ

public final class TJ

extends java.lang.Object

TurboJPEG utility class (cannot be instantiated)

Field Summary

Fields 

Modifier and Type

Field and Description

static int

CS_CMYK

CMYK colorspace.

static int

CS_GRAY

Grayscale colorspace.

static int

CS_RGB

RGB colorspace.

static int

CS_YCbCr

YCbCr colorspace.

static int

CS_YCCK

YCCK colorspace.

static int

ERR_FATAL

The error was fatal and non-recoverable.

static int

ERR_WARNING

The error was non-fatal and recoverable, but the image may still be

 corrupt.

static int

FLAG_ACCURATEDCT

Use the most accurate DCT/IDCT algorithm available in the underlying

 codec.

static int

FLAG_BOTTOMUP

The uncompressed source/destination image is stored in bottom-up (Windows,

 OpenGL) order, not top-down (X11) order.

static int

FLAG_FASTDCT

Use the fastest DCT/IDCT algorithm available in the underlying codec.

static int

FLAG_FASTUPSAMPLE

When decompressing an image that was compressed using chrominance

 subsampling, use the fastest chrominance upsampling algorithm available in

 the underlying codec.

static int

FLAG_FORCEMMX

Deprecated. 

static int

FLAG_FORCESSE

Deprecated. 

static int

FLAG_FORCESSE2

Deprecated. 

static int

FLAG_FORCESSE3

Deprecated. 

static int

FLAG_PROGRESSIVE

Use progressive entropy coding in JPEG images generated by compression and

 transform operations.

static int

FLAG_STOPONWARNING

Immediately discontinue the current compression/decompression/transform

 operation if the underlying codec throws a warning (non-fatal error).

static int

NUMCS

The number of JPEG colorspaces

static int

NUMERR

The number of error codes

static int

NUMPF

The number of pixel formats

static int

NUMSAMP

The number of chrominance subsampling options

static int

PF_ABGR

ABGR pixel format.

static int

PF_ARGB

ARGB pixel format.

static int

PF_BGR

BGR pixel format.

static int

PF_BGRA

BGRA pixel format.

static int

PF_BGRX

BGRX pixel format.

static int

PF_CMYK

CMYK pixel format.

static int

PF_GRAY

Grayscale pixel format.

static int

PF_RGB

RGB pixel format.

static int

PF_RGBA

RGBA pixel format.

static int

PF_RGBX

RGBX pixel format.

static int

PF_XBGR

XBGR pixel format.

static int

PF_XRGB

XRGB pixel format.

static int

SAMP_411

4:1:1 chrominance subsampling.

static int

SAMP_420

4:2:0 chrominance subsampling.

static int

SAMP_422

4:2:2 chrominance subsampling.

static int

SAMP_440

4:4:0 chrominance subsampling.

static int

SAMP_444

4:4:4 chrominance subsampling (no chrominance subsampling).

static int

SAMP_GRAY

Grayscale.

Method Summary

Methods 

Modifier and Type

Method and Description

static int

bufSize(int width,

       int height,

       int jpegSubsamp)

Returns the maximum size of the buffer (in bytes) required to hold a JPEG

 image with the given width, height, and level of chrominance subsampling.

static int

bufSizeYUV(int width,

          int height,

          int subsamp)

Deprecated. 

Use bufSizeYUV(int, int, int, int) instead.

static int

bufSizeYUV(int width,

          int pad,

          int height,

          int subsamp)

Returns the size of the buffer (in bytes) required to hold a YUV planar

 image with the given width, height, and level of chrominance subsampling.

static int

getAlphaOffset(int pixelFormat)

For the given pixel format, returns the number of bytes that the alpha

 component is offset from the start of the pixel.

static int

getBlueOffset(int pixelFormat)

For the given pixel format, returns the number of bytes that the blue

 component is offset from the start of the pixel.

static int

getGreenOffset(int pixelFormat)

For the given pixel format, returns the number of bytes that the green

 component is offset from the start of the pixel.

static int

getMCUHeight(int subsamp)

Returns the MCU block height for the given level of chrominance

 subsampling.

static int

getMCUWidth(int subsamp)

Returns the MCU block width for the given level of chrominance

 subsampling.

static int

getPixelSize(int pixelFormat)

Returns the pixel size (in bytes) for the given pixel format.

static int

getRedOffset(int pixelFormat)

For the given pixel format, returns the number of bytes that the red

 component is offset from the start of the pixel.

static TJScalingFactor[]

getScalingFactors()

Returns a list of fractional scaling factors that the JPEG decompressor in

 this implementation of TurboJPEG supports.

static int

planeHeight(int componentID,

           int height,

           int subsamp)

Returns the plane height of a YUV image plane with the given parameters.

static int

planeSizeYUV(int componentID,

            int width,

            int stride,

            int height,

            int subsamp)

Returns the size of the buffer (in bytes) required to hold a YUV image

 plane with the given parameters.

static int

planeWidth(int componentID,

          int width,

          int subsamp)

Returns the plane width of a YUV image plane with the given parameters.

Methods inherited from class java.lang.Object

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

Field Detail

NUMSAMP

public static final int NUMSAMP

The number of chrominance subsampling options

See Also:
Constant Field Values

SAMP_444

public static final int SAMP_444

4:4:4 chrominance subsampling (no chrominance subsampling).  The JPEG

 or YUV image will contain one chrominance component for every pixel in the

 source image.

See Also:
Constant Field Values

SAMP_422

public static final int SAMP_422

4:2:2 chrominance subsampling.  The JPEG or YUV image will contain one

 chrominance component for every 2x1 block of pixels in the source image.

See Also:
Constant Field Values

SAMP_420

public static final int SAMP_420

4:2:0 chrominance subsampling.  The JPEG or YUV image will contain one

 chrominance component for every 2x2 block of pixels in the source image.

See Also:
Constant Field Values

SAMP_GRAY

public static final int SAMP_GRAY

Grayscale.  The JPEG or YUV image will contain no chrominance components.

See Also:
Constant Field Values

SAMP_440

public static final int SAMP_440

4:4:0 chrominance subsampling.  The JPEG or YUV image will contain one

 chrominance component for every 1x2 block of pixels in the source image.

 Note that 4:4:0 subsampling is not fully accelerated in libjpeg-turbo.

See Also:
Constant Field Values

SAMP_411

public static final int SAMP_411

4:1:1 chrominance subsampling.  The JPEG or YUV image will contain one

 chrominance component for every 4x1 block of pixels in the source image.

 JPEG images compressed with 4:1:1 subsampling will be almost exactly the

 same size as those compressed with 4:2:0 subsampling, and in the

 aggregate, both subsampling methods produce approximately the same

 perceptual quality.  However, 4:1:1 is better able to reproduce sharp

 horizontal features.  Note that 4:1:1 subsampling is not fully accelerated

 in libjpeg-turbo.

See Also:
Constant Field Values

NUMPF

public static final int NUMPF

The number of pixel formats

See Also:
Constant Field Values

PF_RGB

public static final int PF_RGB

RGB pixel format.  The red, green, and blue components in the image are

 stored in 3-byte pixels in the order R, G, B from lowest to highest byte

 address within each pixel.

See Also:
Constant Field Values

PF_BGR

public static final int PF_BGR

BGR pixel format.  The red, green, and blue components in the image are

 stored in 3-byte pixels in the order B, G, R from lowest to highest byte

 address within each pixel.

See Also:
Constant Field Values

PF_RGBX

public static final int PF_RGBX

RGBX pixel format.  The red, green, and blue components in the image are

 stored in 4-byte pixels in the order R, G, B from lowest to highest byte

 address within each pixel.  The X component is ignored when compressing

 and undefined when decompressing.

See Also:
Constant Field Values

PF_BGRX

public static final int PF_BGRX

BGRX pixel format.  The red, green, and blue components in the image are

 stored in 4-byte pixels in the order B, G, R from lowest to highest byte

 address within each pixel.  The X component is ignored when compressing

 and undefined when decompressing.

See Also:
Constant Field Values

PF_XBGR

public static final int PF_XBGR

XBGR pixel format.  The red, green, and blue components in the image are

 stored in 4-byte pixels in the order R, G, B from highest to lowest byte

 address within each pixel.  The X component is ignored when compressing

 and undefined when decompressing.

See Also:
Constant Field Values

PF_XRGB

public static final int PF_XRGB

XRGB pixel format.  The red, green, and blue components in the image are

 stored in 4-byte pixels in the order B, G, R from highest to lowest byte

 address within each pixel.  The X component is ignored when compressing

 and undefined when decompressing.

See Also:
Constant Field Values

PF_GRAY

public static final int PF_GRAY

Grayscale pixel format.  Each 1-byte pixel represents a luminance

 (brightness) level from 0 to 255.

See Also:
Constant Field Values

PF_RGBA

public static final int PF_RGBA

RGBA pixel format.  This is the same as PF_RGBX, except that when

 decompressing, the X byte is guaranteed to be 0xFF, which can be

 interpreted as an opaque alpha channel.

See Also:
Constant Field Values

PF_BGRA

public static final int PF_BGRA

BGRA pixel format.  This is the same as PF_BGRX, except that when

 decompressing, the X byte is guaranteed to be 0xFF, which can be

 interpreted as an opaque alpha channel.

See Also:
Constant Field Values

PF_ABGR

public static final int PF_ABGR

ABGR pixel format.  This is the same as PF_XBGR, except that when

 decompressing, the X byte is guaranteed to be 0xFF, which can be

 interpreted as an opaque alpha channel.

See Also:
Constant Field Values

PF_ARGB

public static final int PF_ARGB

ARGB pixel format.  This is the same as PF_XRGB, except that when

 decompressing, the X byte is guaranteed to be 0xFF, which can be

 interpreted as an opaque alpha channel.

See Also:
Constant Field Values

PF_CMYK

public static final int PF_CMYK

CMYK pixel format.  Unlike RGB, which is an additive color model used

 primarily for display, CMYK (Cyan/Magenta/Yellow/Key) is a subtractive

 color model used primarily for printing.  In the CMYK color model, the

 value of each color component typically corresponds to an amount of cyan,

 magenta, yellow, or black ink that is applied to a white background.  In

 order to convert between CMYK and RGB, it is necessary to use a color

 management system (CMS.)  A CMS will attempt to map colors within the

 printer's gamut to perceptually similar colors in the display's gamut and

 vice versa, but the mapping is typically not 1:1 or reversible, nor can it

 be defined with a simple formula.  Thus, such a conversion is out of scope

 for a codec library.  However, the TurboJPEG API allows for compressing

 CMYK pixels into a YCCK JPEG image (see CS_YCCK) and

 decompressing YCCK JPEG images into CMYK pixels.

See Also:
Constant Field Values

NUMCS

public static final int NUMCS

The number of JPEG colorspaces

See Also:
Constant Field Values

CS_RGB

public static final int CS_RGB

RGB colorspace.  When compressing the JPEG image, the R, G, and B

 components in the source image are reordered into image planes, but no

 colorspace conversion or subsampling is performed.  RGB JPEG images can be

 decompressed to any of the extended RGB pixel formats or grayscale, but

 they cannot be decompressed to YUV images.

See Also:
Constant Field Values