[ViNT]

Сам не пользовался, вот описание:

public void drawRGB(int[] rgbData,
                    int offset,
                    int scanlength,
                    int x,
                    int y,
                    int width,
                    int height,
                    boolean processAlpha)
Renders a series of device-independent RGB+transparency values in a specified region. The values are stored in rgbData in a format with 24 bits of RGB and an eight-bit alpha value (0xAARRGGBB), with the first value stored at the specified offset. The scanlength specifies the relative offset within the array between the corresponding pixels of consecutive rows. Any value for scanlength is acceptable (even negative values) provided that all resulting references are within the bounds of the rgbData array. The ARGB data is rasterized horizontally from left to right within each row. The ARGB values are rendered in the region specified by x, y, width and height, and the operation is subject to the current clip region and translation for this Graphics object. 

Consider P(a,b) to be the value of the pixel located at column a and row b of the Image, where rows and columns are numbered downward from the top starting at zero, and columns are numbered rightward from the left starting at zero. This operation can then be defined as:


    P(a, b) = rgbData[offset + (a - x) + (b - y) * scanlength]       

for 


     x <= a < x + width
     y <= b < y + height    

This capability is provided in the Graphics class so that it can be used to render both to the screen and to offscreen Image objects. The ability to retrieve ARGB values is provided by the Image.getRGB(int[], int, int, int, int, int, int) method. 

If processAlpha is true, the high-order byte of the ARGB format specifies opacity; that is, 0x00RRGGBB specifies a fully transparent pixel and 0xFFRRGGBB specifies a fully opaque pixel. Intermediate alpha values specify semitransparency. If the implementation does not support alpha blending for image rendering operations, it must remove any semitransparency from the source data prior to performing any rendering. (See Alpha Processing for further discussion.) If processAlpha is false, the alpha values are ignored and all pixels must be treated as completely opaque.

The mapping from ARGB values to the device-dependent pixels is platform-specific and may require significant computation.
Parameters:
rgbData - an array of ARGB values in the format 0xAARRGGBB
offset - the array index of the first ARGB value
scanlength - the relative array offset between the corresponding pixels in consecutive rows in the rgbData array
x - the horizontal location of the region to be rendered
y - the vertical location of the region to be rendered
width - the width of the region to be rendered
height - the height of the region to be rendered
processAlpha - true if rgbData has an alpha channel, false if all pixels are fully opaque
===================================================================
public static Image createRGBImage(int[] rgb,
                                   int width,
                                   int height,
                                   boolean processAlpha)
Creates an immutable image from a sequence of ARGB values, specified as 0xAARRGGBB. The ARGB data within the rgb array is arranged horizontally from left to right within each row, row by row from top to bottom. If processAlpha is true, the high-order byte specifies opacity; that is, 0x00RRGGBB specifies a fully transparent pixel and 0xFFRRGGBB specifies a fully opaque pixel. Intermediate alpha values specify semitransparency. If the implementation does not support alpha blending for image rendering operations, it must replace any semitransparent pixels with fully transparent pixels. (See Alpha Processing for further discussion.) If processAlpha is false, the alpha values are ignored and all pixels must be treated as fully opaque. 

Consider P(a,b) to be the value of the pixel located at column a and row b of the Image, where rows and columns are numbered downward from the top starting at zero, and columns are numbered rightward from the left starting at zero. This operation can then be defined as:


    P(a, b) = rgb[a + b * width];    

for


     0 <= a < width
     0 <= b < height    

Parameters:
rgb - an array of ARGB values that composes the image
width - the width of the image
height - the height of the image
processAlpha - true if rgb has an alpha channel, false if all pixels are fully opaque
Returns:
the created image
======================================================================
public void getRGB(int[] rgbData,
                   int offset,
                   int scanlength,
                   int x,
                   int y,
                   int width,
                   int height)
Obtains ARGB pixel data from the specified region of this image and stores it in the provided array of integers. Each pixel value is stored in 0xAARRGGBB format, where the high-order byte contains the alpha channel and the remaining bytes contain color components for red, green and blue, respectively. The alpha channel specifies the opacity of the pixel, where a value of 0x00 represents a pixel that is fully transparent and a value of 0xFF represents a fully opaque pixel. 

The returned values are not guaranteed to be identical to values from the original source, such as from createRGBImage or from a PNG image. Color values may be resampled to reflect the display capabilities of the device (for example, red, green or blue pixels may all be represented by the same gray value on a grayscale device). On devices that do not support alpha blending, the alpha value will be 0xFF for opaque pixels and 0x00 for all other pixels (see Alpha Processing for further discussion.) On devices that support alpha blending, alpha channel values may be resampled to reflect the number of levels of semitransparency supported.

The scanlength specifies the relative offset within the array between the corresponding pixels of consecutive rows. In order to prevent rows of stored pixels from overlapping, the absolute value of scanlength must be greater than or equal to width. Negative values of scanlength are allowed. In all cases, this must result in every reference being within the bounds of the rgbData array.

Consider P(a,b) to be the value of the pixel located at column a and row b of the Image, where rows and columns are numbered downward from the top starting at zero, and columns are numbered rightward from the left starting at zero. This operation can then be defined as:


    rgbData[offset + (a - x) + (b - y) * scanlength] = P(a, b);

for


     x <= a < x + width
     y <= b < y + height    

The source rectangle is required to not exceed the bounds of the image. This means: 


   x >= 0
   y >= 0
   x + width <= image width
   y + height <= image height    

If any of these conditions is not met an IllegalArgumentException is thrown. Otherwise, in cases where width <= 0 or height <= 0, no exception is thrown, and no pixel data is copied to rgbData.
Parameters:
rgbData - an array of integers in which the ARGB pixel data is stored
offset - the index into the array where the first ARGB value is stored
scanlength - the relative offset in the array between corresponding pixels in consecutive rows of the region
x - the x-coordinate of the upper left corner of the region
y - the y-coordinate of the upper left corner of the region
width - the width of the region
height - the height of the region
========================================================================