Java tutorial
/* * Copyright (c) 1995, 2018, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.awt.image; import java.util.Hashtable; /** * The interface for objects expressing interest in image data through * the ImageProducer interfaces. When a consumer is added to an image * producer, the producer delivers all of the data about the image * using the method calls defined in this interface. * * @see ImageProducer * * @author Jim Graham */ public interface ImageConsumer { /** * The dimensions of the source image are reported using the * setDimensions method call. * @param width the width of the source image * @param height the height of the source image */ void setDimensions(int width, int height); /** * Sets the extensible list of properties associated with this image. * @param props the list of properties to be associated with this * image */ void setProperties(Hashtable<?, ?> props); /** * Sets the ColorModel object used for the majority of * the pixels reported using the setPixels method * calls. Note that each set of pixels delivered using setPixels * contains its own ColorModel object, so no assumption should * be made that this model will be the only one used in delivering * pixel values. A notable case where multiple ColorModel objects * may be seen is a filtered image when for each set of pixels * that it filters, the filter * determines whether the * pixels can be sent on untouched, using the original ColorModel, * or whether the pixels should be modified (filtered) and passed * on using a ColorModel more convenient for the filtering process. * @param model the specified {@code ColorModel} * @see ColorModel */ void setColorModel(ColorModel model); /** * Sets the hints that the ImageConsumer uses to process the * pixels delivered by the ImageProducer. * The ImageProducer can deliver the pixels in any order, but * the ImageConsumer may be able to scale or convert the pixels * to the destination ColorModel more efficiently or with higher * quality if it knows some information about how the pixels will * be delivered up front. The setHints method should be called * before any calls to any of the setPixels methods with a bit mask * of hints about the manner in which the pixels will be delivered. * If the ImageProducer does not follow the guidelines for the * indicated hint, the results are undefined. * @param hintflags a set of hints that the ImageConsumer uses to * process the pixels */ void setHints(int hintflags); /** * The pixels will be delivered in a random order. This tells the * ImageConsumer not to use any optimizations that depend on the * order of pixel delivery, which should be the default assumption * in the absence of any call to the setHints method. * @see #setHints */ int RANDOMPIXELORDER = 1; /** * The pixels will be delivered in top-down, left-to-right order. * @see #setHints */ int TOPDOWNLEFTRIGHT = 2; /** * The pixels will be delivered in (multiples of) complete scanlines * at a time. * @see #setHints */ int COMPLETESCANLINES = 4; /** * The pixels will be delivered in a single pass. Each pixel will * appear in only one call to any of the setPixels methods. An * example of an image format which does not meet this criterion * is a progressive JPEG image which defines pixels in multiple * passes, each more refined than the previous. * @see #setHints */ int SINGLEPASS = 8; /** * The image contain a single static image. The pixels will be defined * in calls to the setPixels methods and then the imageComplete method * will be called with the STATICIMAGEDONE flag after which no more * image data will be delivered. An example of an image type which * would not meet these criteria would be the output of a video feed, * or the representation of a 3D rendering being manipulated * by the user. The end of each frame in those types of images will * be indicated by calling imageComplete with the SINGLEFRAMEDONE flag. * @see #setHints * @see #imageComplete */ int SINGLEFRAME = 16; /** * Delivers the pixels of the image with one or more calls * to this method. Each call specifies the location and * size of the rectangle of source pixels that are contained in * the array of pixels. The specified ColorModel object should * be used to convert the pixels into their corresponding color * and alpha components. Pixel (m,n) is stored in the pixels array * at index (n * scansize + m + off). The pixels delivered using * this method are all stored as bytes. * @param x the X coordinate of the upper-left corner of the * area of pixels to be set * @param y the Y coordinate of the upper-left corner of the * area of pixels to be set * @param w the width of the area of pixels * @param h the height of the area of pixels * @param model the specified {@code ColorModel} * @param pixels the array of pixels * @param off the offset into the {@code pixels} array * @param scansize the distance from one row of pixels to the next in * the {@code pixels} array * @see ColorModel */ void setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize); /** * The pixels of the image are delivered using one or more calls * to the setPixels method. Each call specifies the location and * size of the rectangle of source pixels that are contained in * the array of pixels. The specified ColorModel object should * be used to convert the pixels into their corresponding color * and alpha components. Pixel (m,n) is stored in the pixels array * at index (n * scansize + m + off). The pixels delivered using * this method are all stored as ints. * this method are all stored as ints. * @param x the X coordinate of the upper-left corner of the * area of pixels to be set * @param y the Y coordinate of the upper-left corner of the * area of pixels to be set * @param w the width of the area of pixels * @param h the height of the area of pixels * @param model the specified {@code ColorModel} * @param pixels the array of pixels * @param off the offset into the {@code pixels} array * @param scansize the distance from one row of pixels to the next in * the {@code pixels} array * @see ColorModel */ void setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize); /** * The imageComplete method is called when the ImageProducer is * finished delivering all of the pixels that the source image * contains, or when a single frame of a multi-frame animation has * been completed, or when an error in loading or producing the * image has occurred. The ImageConsumer should remove itself from the * list of consumers registered with the ImageProducer at this time, * unless it is interested in successive frames. * @param status the status of image loading * @see ImageProducer#removeConsumer */ void imageComplete(int status); /** * An error was encountered while producing the image. * @see #imageComplete */ int IMAGEERROR = 1; /** * One frame of the image is complete but there are more frames * to be delivered. * @see #imageComplete */ int SINGLEFRAMEDONE = 2; /** * The image is complete and there are no more pixels or frames * to be delivered. * @see #imageComplete */ int STATICIMAGEDONE = 3; /** * The image creation process was deliberately aborted. * @see #imageComplete */ int IMAGEABORTED = 4; }