Module javafx.graphics

Package javafx.scene.image

Class PixelFormat<T extends Buffer>

java.lang.Object

javafx.scene.image.PixelFormat<T>

Direct Known Subclasses:

WritablePixelFormat

public abstract class PixelFormat<T extends Buffer>
extends Object

A PixelFormat object defines the layout of data for a pixel of a given format.

Since:

JavaFX 2.2

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PixelFormat.Type	An enum describing the in-array storage format of a single pixel managed by a PixelFormat.

Method Summary

Modifier and Type	Method	Description
static PixelFormat<ByteBuffer>	createByteIndexedInstance(int[] colors)	Creates a PixelFormat instance describing a pixel layout with the pixels stored as single bytes representing an index into the specified lookup table of non-premultiplied color values in the INT_ARGB format.
static PixelFormat<ByteBuffer>	createByteIndexedPremultipliedInstance(int[] colors)	Creates a PixelFormat instance describing a pixel layout with the pixels stored as single bytes representing an index into the specified lookup table of premultiplied color values in the INT_ARGB_PRE format.
abstract int	getArgb(T buf, int x, int y, int scanlineStride)	Reads pixel data from the buffer at the specified coordinates and converts it to a 32-bit integer representation of the color in the INT_ARGB format.
static WritablePixelFormat<ByteBuffer>	getByteBgraInstance()	Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in adjacent bytes with the non-premultiplied components stored in order of increasing index: blue, green, red, alpha.
static WritablePixelFormat<ByteBuffer>	getByteBgraPreInstance()	Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in adjacent bytes with the premultiplied components stored in order of increasing index: blue, green, red, alpha.
static PixelFormat<ByteBuffer>	getByteRgbInstance()	Returns a PixelFormat instance describing a pixel layout with the pixels stored in adjacent bytes with the color components stored in order of increasing index: red, green, blue.
static WritablePixelFormat<IntBuffer>	getIntArgbInstance()	Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in 32-bit integers with the non-premultiplied components stored in order, from MSb to LSb: alpha, red, green, blue.
static WritablePixelFormat<IntBuffer>	getIntArgbPreInstance()	Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in 32-bit integers with the premultiplied components stored in order, from MSb to LSb: alpha, red, green, blue.
PixelFormat.Type	getType()	Returns the enum representing the storage format of the pixels managed by this PixelFormat object.
abstract boolean	isPremultiplied()	Returns true iff the color components decoded (or encoded) by this format are pre-multiplied by the alpha component for more efficient blending calculations.
abstract boolean	isWritable()	Returns true iff this PixelFormat object can convert color information into a pixel representation.

Methods inherited from class java.lang.Object

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

Method Detail

getIntArgbInstance

public static WritablePixelFormat<IntBuffer> getIntArgbInstance()

Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in 32-bit integers with the non-premultiplied components stored in order, from MSb to LSb: alpha, red, green, blue.

Pixels in this format can be decoded using the following sample code:

     int pixel = array[rowstart + x];

     int alpha = ((pixel >> 24) & 0xff);
     int red   = ((pixel >> 16) & 0xff);
     int green = ((pixel >>  8) & 0xff);
     int blue  = ((pixel >>   ) & 0xff);
 

Returns:

a WritabelPixelFormat<IntBuffer> describing the indicated pixel format

getIntArgbPreInstance

public static WritablePixelFormat<IntBuffer> getIntArgbPreInstance()

Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in 32-bit integers with the premultiplied components stored in order, from MSb to LSb: alpha, red, green, blue.

Pixels in this format can be decoded using the following sample code:

     int pixel = array[rowstart + x];

     int alpha = ((pixel >> 24) & 0xff);
     int red   = ((pixel >> 16) & 0xff);
     int green = ((pixel >>  8) & 0xff);
     int blue  = ((pixel >>   ) & 0xff);
 

Returns:

a WritabelPixelFormat<IntBuffer> describing the indicated pixel format

getByteBgraInstance

public static WritablePixelFormat<ByteBuffer> getByteBgraInstance()

Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in adjacent bytes with the non-premultiplied components stored in order of increasing index: blue, green, red, alpha.

Pixels in this format can be decoded using the following sample code:

     int i = rowstart + x * 4;

     int blue  = (array[i+0] & 0xff);
     int green = (array[i+1] & 0xff);
     int red   = (array[i+2] & 0xff);
     int alpha = (array[i+3] & 0xff);
 

Returns:

a WritablePixelFormat<ByteBuffer> describing the indicated pixel format

getByteBgraPreInstance

public static WritablePixelFormat<ByteBuffer> getByteBgraPreInstance()

Returns a WritablePixelFormat instance describing a pixel layout with the pixels stored in adjacent bytes with the premultiplied components stored in order of increasing index: blue, green, red, alpha.

Pixels in this format can be decoded using the following sample code:

     int i = rowstart + x * 4;

     int blue  = (array[i+0] & 0xff);
     int green = (array[i+1] & 0xff);
     int red   = (array[i+2] & 0xff);
     int alpha = (array[i+3] & 0xff);
 

Returns:

a WritablePixelFormat<ByteBuffer> describing the indicated pixel format

getByteRgbInstance

public static PixelFormat<ByteBuffer> getByteRgbInstance()

Returns a PixelFormat instance describing a pixel layout with the pixels stored in adjacent bytes with the color components stored in order of increasing index: red, green, blue.

Pixels in this format can be decoded using the following sample code:

     int i = rowstart + x * 3;

     int red   = (array[i+0] & 0xff);
     int green = (array[i+1] & 0xff);
     int blue  = (array[i+2] & 0xff);
 

Returns:

a PixelFormat<ByteBuffer> describing the indicated pixel format

createByteIndexedPremultipliedInstance

public static PixelFormat<ByteBuffer> createByteIndexedPremultipliedInstance(int[] colors)

Creates a PixelFormat instance describing a pixel layout with the pixels stored as single bytes representing an index into the specified lookup table of premultiplied color values in the INT_ARGB_PRE format.

Pixels in this format can be decoded using the following sample code:

     int pixel = array[rowstart + x] & 0xff;
     int argb  = colors[pixel];

     int alpha = ((argb >> 24) & 0xff);
     int red   = ((argb >> 16) & 0xff);
     int green = ((argb >>  8) & 0xff);
     int blue  = ((argb      ) & 0xff);
 

Parameters:

colors - an int[] array of 32-bit color values in the INT_ARGB_PRE format

Returns:

a PixelFormat<ByteBuffer> describing the indicated pixel format with the specified list of premultiplied colors

createByteIndexedInstance

public static PixelFormat<ByteBuffer> createByteIndexedInstance(int[] colors)

Creates a PixelFormat instance describing a pixel layout with the pixels stored as single bytes representing an index into the specified lookup table of non-premultiplied color values in the INT_ARGB format.

Pixels in this format can be decoded using the following sample code:

     int pixel = array[rowstart + x] & 0xff;
     int argb  = colors[pixel];

     int alpha = ((argb >> 24) & 0xff);
     int red   = ((argb >> 16) & 0xff);
     int green = ((argb >>  8) & 0xff);
     int blue  = ((argb      ) & 0xff);
 

Parameters:

colors - an int[] array of 32-bit color values in the INT_ARGB format

Returns:

a PixelFormat<ByteBuffer> describing the indicated pixel format with the specified list of non-premultiplied colors

getType

public PixelFormat.Type getType()

Returns the enum representing the storage format of the pixels managed by this PixelFormat object.

Returns:

the Type enum of the pixels

isWritable

public abstract boolean isWritable()

Returns true iff this PixelFormat object can convert color information into a pixel representation.

Returns:

true iff this PixelFormat can convert colors to pixel data

isPremultiplied

public abstract boolean isPremultiplied()

Returns true iff the color components decoded (or encoded) by this format are pre-multiplied by the alpha component for more efficient blending calculations.

Returns:

true iff the managed color components are premultiplied by alpha

getArgb

public abstract int getArgb(T buf,
                            int x,
                            int y,
                            int scanlineStride)

Reads pixel data from the buffer at the specified coordinates and converts it to a 32-bit integer representation of the color in the INT_ARGB format. The 32-bit integer will contain the 4 color components in separate 8-bit fields in ARGB order from the most significant byte to the least significant byte. The buffer should be positioned to the start of the pixel data such that buf.get(0) would return the pixel information for the pixel at coordinates (0, 0). The scanlineStride parameter defines the distance from the pixel data at the start of one row to the pixel data at the start of the immediately following row at the next higher Y coordinate. Usually, scanlineStride is the same as the width of the image multiplied by the number of data elements per pixel (1 for the case of the integer and indexed formats, or 3 or 4 in the case of the byte formats), but some images may have further padding between rows for alignment or other purposes.

The color components can be extracted from the returned integer using the following sample code:

     int alpha = ((retval >> 24) & 0xff);
     int red   = ((retval >> 16) & 0xff);
     int green = ((retval >>  8) & 0xff);
     int blue  = ((retval      ) & 0xff);
 

Parameters:

buf - the buffer of pixel data

x - the X coordinate of the pixel to be read

y - the Y coordinate of the pixel to be read

scanlineStride - the number of buffer elements between the start of adjacent pixel rows in the buffer

Returns:

a 32-bit value with the color of the pixel in a format similar to the INT_ARGB pixel format