https://openjdk.java.net/ 
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package java.awt;

import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.ColorModel;
import java.awt.image.Raster;


The PaintContext interface defines the encapsulated and optimized environment to generate color patterns in device space for fill or stroke operations on a Graphics2D. The PaintContext provides the necessary colors for Graphics2D operations in the form of a Raster associated with a ColorModel. The PaintContext maintains state for a particular paint operation. In a multi-threaded environment, several contexts can exist simultaneously for a single Paint object. 
See Also:
/**
 * The {@code PaintContext} interface defines the encapsulated
 * and optimized environment to generate color patterns in device
 * space for fill or stroke operations on a
 * {@link Graphics2D}.  The {@code PaintContext} provides
 * the necessary colors for {@code Graphics2D} operations in the
 * form of a {@link Raster} associated with a {@link ColorModel}.
 * The {@code PaintContext} maintains state for a particular paint
 * operation.  In a multi-threaded environment, several
 * contexts can exist simultaneously for a single {@link Paint} object.
 * @see Paint
 */

public interface PaintContext {
    
Releases the resources allocated for the operation.

/**
     * Releases the resources allocated for the operation.
     */
    public void dispose();

    
Returns the ColorModel of the output. Note that this ColorModel might be different from the hint specified in the createContext method of Paint. Not all PaintContext objects are capable of generating color patterns in an arbitrary ColorModel. 
Returns:the ColorModel of the output.
/**
     * Returns the {@code ColorModel} of the output.  Note that
     * this {@code ColorModel} might be different from the hint
     * specified in the
     * {@link Paint#createContext(ColorModel, Rectangle, Rectangle2D,
AffineTransform, RenderingHints) createContext} method of
     * {@code Paint}.  Not all {@code PaintContext} objects are
     * capable of generating color patterns in an arbitrary
     * {@code ColorModel}.
     * @return the {@code ColorModel} of the output.
     */
    ColorModel getColorModel();

    
Returns a Raster containing the colors generated for the graphics operation. 
Params:
  • x – the x coordinate of the area in device space
for which colors are generated.
  • y – the y coordinate of the area in device space
for which colors are generated.
  • w – the width of the area in device space
  • h – the height of the area in device space
Returns:a Raster representing the specified rectangular area and containing the colors generated for the graphics operation.
/**
     * Returns a {@code Raster} containing the colors generated for
     * the graphics operation.
     * @param x the x coordinate of the area in device space
     * for which colors are generated.
     * @param y the y coordinate of the area in device space
     * for which colors are generated.
     * @param w the width of the area in device space
     * @param h the height of the area in device space
     * @return a {@code Raster} representing the specified
     * rectangular area and containing the colors generated for
     * the graphics operation.
     */
    Raster getRaster(int x,
                     int y,
                     int w,
                     int h);

}