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Diffstat (limited to 'libjava/classpath/java/awt/image/PixelGrabber.java')
| -rw-r--r-- | libjava/classpath/java/awt/image/PixelGrabber.java | 631 |
1 files changed, 0 insertions, 631 deletions
diff --git a/libjava/classpath/java/awt/image/PixelGrabber.java b/libjava/classpath/java/awt/image/PixelGrabber.java deleted file mode 100644 index b83fab5..0000000 --- a/libjava/classpath/java/awt/image/PixelGrabber.java +++ /dev/null @@ -1,631 +0,0 @@ -/* PixelGrabber.java -- retrieve a subset of an image's data - Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath 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 for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - - -package java.awt.image; - -import java.awt.Image; -import java.util.Hashtable; - -/** - * PixelGrabber is an ImageConsumer that extracts a rectangular region - * of pixels from an Image. - */ -public class PixelGrabber implements ImageConsumer -{ - int x, y, offset; - int width = -1; - int height = -1; - int scansize = -1; - boolean forceRGB = true; - - ColorModel model = ColorModel.getRGBdefault(); - int hints; - Hashtable<?,?> props; - - int int_pixel_buffer[]; - boolean ints_delivered = false; - byte byte_pixel_buffer[]; - boolean bytes_delivered = false; - - ImageProducer ip; - int observerStatus; - int consumerStatus; - - private Thread grabberThread; - boolean grabbing = false; - - /** - * Construct a PixelGrabber that will retrieve RGB data from a given - * Image. - * - * The RGB data will be retrieved from a rectangular region - * <code>(x, y, w, h)</code> within the image. The data will be - * stored in the provided <code>pix</code> array, which must have - * been initialized to a size of at least <code>w * h</code>. The - * data for a pixel (m, n) in the grab rectangle will be stored at - * <code>pix[(n - y) * scansize + (m - x) + off]</code>. - * - * @param img the Image from which to grab pixels - * @param x the x coordinate, relative to <code>img</code>'s - * top-left corner, of the grab rectangle's top-left pixel - * @param y the y coordinate, relative to <code>img</code>'s - * top-left corner, of the grab rectangle's top-left pixel - * @param w the width of the grab rectangle, in pixels - * @param h the height of the grab rectangle, in pixels - * @param pix the array in which to store grabbed RGB pixel data - * @param off the offset into the <code>pix</code> array at which to - * start storing RGB data - * @param scansize a set of <code>scansize</code> consecutive - * elements in the <code>pix</code> array represents one row of - * pixels in the grab rectangle - */ - public PixelGrabber(Image img, int x, int y, int w, int h, - int pix[], int off, int scansize) - { - this (img.getSource(), x, y, w, h, pix, off, scansize); - } - - /** - * Construct a PixelGrabber that will retrieve RGB data from a given - * ImageProducer. - * - * The RGB data will be retrieved from a rectangular region - * <code>(x, y, w, h)</code> within the image produced by - * <code>ip</code>. The data will be stored in the provided - * <code>pix</code> array, which must have been initialized to a - * size of at least <code>w * h</code>. The data for a pixel (m, n) - * in the grab rectangle will be stored at - * <code>pix[(n - y) * scansize + (m - x) + off]</code>. - * - * @param ip the ImageProducer from which to grab pixels. This can - * be null. - * @param x the x coordinate of the grab rectangle's top-left pixel, - * specified relative to the top-left corner of the image produced - * by <code>ip</code> - * @param y the y coordinate of the grab rectangle's top-left pixel, - * specified relative to the top-left corner of the image produced - * by <code>ip</code> - * @param w the width of the grab rectangle, in pixels - * @param h the height of the grab rectangle, in pixels - * @param pix the array in which to store grabbed RGB pixel data - * @param off the offset into the <code>pix</code> array at which to - * start storing RGB data - * @param scansize a set of <code>scansize</code> consecutive - * elements in the <code>pix</code> array represents one row of - * pixels in the grab rectangle - */ - public PixelGrabber(ImageProducer ip, int x, int y, int w, int h, - int pix[], int off, int scansize) - { - this.ip = ip; - this.x = x; - this.y = y; - this.width = w; - this.height = h; - this.offset = off; - this.scansize = scansize; - - int_pixel_buffer = pix; - // Initialize the byte array in case ip sends us byte-formatted - // pixel data. - byte_pixel_buffer = new byte[pix.length * 4]; - } - - /** - * Construct a PixelGrabber that will retrieve data from a given - * Image. - * - * The RGB data will be retrieved from a rectangular region - * <code>(x, y, w, h)</code> within the image. The data will be - * stored in an internal array which can be accessed by calling - * <code>getPixels</code>. The data for a pixel (m, n) in the grab - * rectangle will be stored in the returned array at index - * <code>(n - y) * scansize + (m - x) + off</code>. - * If forceRGB is false, then the returned data will be not be - * converted to RGB from its format in <code>img</code>. - * - * If <code>w</code> is negative, the width of the grab region will - * be from x to the right edge of the image. Likewise, if - * <code>h</code> is negative, the height of the grab region will be - * from y to the bottom edge of the image. - * - * @param img the Image from which to grab pixels - * @param x the x coordinate, relative to <code>img</code>'s - * top-left corner, of the grab rectangle's top-left pixel - * @param y the y coordinate, relative to <code>img</code>'s - * top-left corner, of the grab rectangle's top-left pixel - * @param w the width of the grab rectangle, in pixels - * @param h the height of the grab rectangle, in pixels - * @param forceRGB true to force conversion of the rectangular - * region's pixel data to RGB - */ - public PixelGrabber(Image img, - int x, int y, - int w, int h, - boolean forceRGB) - { - this.ip = img.getSource(); - - if (this.ip == null) - throw new NullPointerException("The ImageProducer must not be null."); - - this.x = x; - this.y = y; - width = w; - height = h; - // If width or height is negative, postpone pixel buffer - // initialization until setDimensions is called back by ip. - if (width >= 0 && height >= 0) - { - int_pixel_buffer = new int[width * height]; - byte_pixel_buffer = new byte[width * height]; - } - this.forceRGB = forceRGB; - } - - /** - * Start grabbing pixels. - * - * Spawns an image production thread that calls back to this - * PixelGrabber's ImageConsumer methods. - */ - public synchronized void startGrabbing() - { - // Make sure we're not already grabbing. - if (grabbing == false) - { - grabbing = true; - grabberThread = new Thread () - { - public void run () - { - try - { - ip.startProduction (PixelGrabber.this); - } - catch (Exception ex) - { - imageComplete(ImageConsumer.IMAGEABORTED); - } - } - }; - grabberThread.start (); - } - } - - /** - * Abort pixel grabbing. - */ - public synchronized void abortGrabbing() - { - if (grabbing) - { - // Interrupt the grabbing thread. - Thread moribund = grabberThread; - grabberThread = null; - moribund.interrupt(); - - imageComplete (ImageConsumer.IMAGEABORTED); - } - } - - /** - * Have our Image or ImageProducer start sending us pixels via our - * ImageConsumer methods and wait for all pixels in the grab - * rectangle to be delivered. - * - * @return true if successful, false on abort or error - * - * @throws InterruptedException if interrupted by another thread. - */ - public synchronized boolean grabPixels() throws InterruptedException - { - return grabPixels(0); - } - - /** - * grabPixels's behavior depends on the value of <code>ms</code>. - * - * If ms < 0, return true if all pixels from the source image have - * been delivered, false otherwise. Do not wait. - * - * If ms >= 0 then we request that our Image or ImageProducer start - * delivering pixels to us via our ImageConsumer methods. - * - * If ms > 0, wait at most <code>ms</code> milliseconds for - * delivery of all pixels within the grab rectangle. - * - * If ms == 0, wait until all pixels have been delivered. - * - * @return true if all pixels from the source image have been - * delivered, false otherwise - * - * @throws InterruptedException if this thread is interrupted while - * we are waiting for pixels to be delivered - */ - public synchronized boolean grabPixels(long ms) throws InterruptedException - { - if (ms < 0) - return ((observerStatus & (ImageObserver.FRAMEBITS - | ImageObserver.ALLBITS)) != 0); - - // Spawn a new ImageProducer thread to send us the image data via - // our ImageConsumer methods. - startGrabbing(); - - if (ms > 0) - { - long stop_time = System.currentTimeMillis() + ms; - long time_remaining; - while (grabbing) - { - time_remaining = stop_time - System.currentTimeMillis(); - if (time_remaining <= 0) - break; - wait (time_remaining); - } - abortGrabbing (); - } - else - wait (); - - // If consumerStatus is non-zero then the image is done loading or - // an error has occurred. - if (consumerStatus != 0) - return setObserverStatus (); - - return ((observerStatus & (ImageObserver.FRAMEBITS - | ImageObserver.ALLBITS)) != 0); - } - - // Set observer status flags based on the current consumer status - // flags. Return true if the consumer flags indicate that the - // image was loaded successfully, or false otherwise. - private synchronized boolean setObserverStatus () - { - boolean retval = false; - - if ((consumerStatus & IMAGEERROR) != 0) - observerStatus |= ImageObserver.ERROR; - - if ((consumerStatus & IMAGEABORTED) != 0) - observerStatus |= ImageObserver.ABORT; - - if ((consumerStatus & STATICIMAGEDONE) != 0) - { - observerStatus |= ImageObserver.ALLBITS; - retval = true; - } - - if ((consumerStatus & SINGLEFRAMEDONE) != 0) - { - observerStatus |= ImageObserver.FRAMEBITS; - retval = true; - } - - return retval; - } - - /** - * @return the status of the pixel grabbing thread, represented by a - * bitwise OR of ImageObserver flags - */ - public synchronized int getStatus() - { - return observerStatus; - } - - /** - * @return the width of the grab rectangle in pixels, or a negative - * number if the ImageProducer has not yet called our setDimensions - * method - */ - public synchronized int getWidth() - { - return width; - } - - /** - * @return the height of the grab rectangle in pixels, or a negative - * number if the ImageProducer has not yet called our setDimensions - * method - */ - public synchronized int getHeight() - { - return height; - } - - /** - * @return a byte array of pixel data if ImageProducer delivered - * pixel data using the byte[] variant of setPixels, or an int array - * otherwise - */ - public synchronized Object getPixels() - { - if (ints_delivered) - return int_pixel_buffer; - else if (bytes_delivered) - return byte_pixel_buffer; - else - return null; - } - - /** - * @return the ColorModel currently being used for the majority of - * pixel data conversions - */ - public synchronized ColorModel getColorModel() - { - return model; - } - - /** - * Our <code>ImageProducer</code> calls this method to indicate the - * size of the image being produced. - * - * setDimensions is an ImageConsumer method. None of PixelGrabber's - * ImageConsumer methods should be called by code that instantiates - * a PixelGrabber. They are only made public so they can be called - * by the PixelGrabber's ImageProducer. - * - * @param width the width of the image - * @param height the height of the image - */ - public synchronized void setDimensions(int width, int height) - { - // Our width wasn't set when we were constructed. Set our width - // so that the grab region includes all pixels from x to the right - // edge of the source image. - if (this.width < 0) - this.width = width - x; - - // Our height wasn't set when we were constructed. Set our height - // so that the grab region includes all pixels from y to the - // bottom edge of the source image. - if (this.height < 0) - this.height = height - y; - - if (scansize < 0) - scansize = this.width; - - if (int_pixel_buffer == null) - int_pixel_buffer = new int[this.width * this.height]; - - if (byte_pixel_buffer == null) - byte_pixel_buffer = new byte[this.width * this.height]; - } - - /** - * Our <code>ImageProducer</code> may call this method to send us a - * list of its image's properties. - * - * setProperties is an ImageConsumer method. None of PixelGrabber's - * ImageConsumer methods should be called by code that instantiates - * a PixelGrabber. They are only made public so they can be called - * by the PixelGrabber's ImageProducer. - * - * @param props a list of properties associated with the image being - * produced - */ - public synchronized void setProperties(Hashtable<?,?> props) - { - this.props = props; - } - - /** - * Our ImageProducer will call <code>setColorModel</code> to - * indicate the model used by the majority of calls to - * <code>setPixels</code>. Each call to <code>setPixels</code> - * could however indicate a different <code>ColorModel</code>. - * - * setColorModel is an ImageConsumer method. None of PixelGrabber's - * ImageConsumer methods should be called by code that instantiates - * a PixelGrabber. They are only made public so they can be called - * by the PixelGrabber's ImageProducer. - * - * @param model the color model to be used most often by setPixels - * - * @see ColorModel - */ - public synchronized void setColorModel(ColorModel model) - { - this.model = model; - } - - /** - * Our <code>ImageProducer</code> may call this method with a - * bit mask of hints from any of <code>RANDOMPIXELORDER</code>, - * <code>TOPDOWNLEFTRIGHT</code>, <code>COMPLETESCANLINES</code>, - * <code>SINGLEPASS</code>, <code>SINGLEFRAME</code>. - * - * setHints is an ImageConsumer method. None of PixelGrabber's - * ImageConsumer methods should be called by code that instantiates - * a PixelGrabber. They are only made public so they can be called - * by the PixelGrabber's ImageProducer. - * - * @param flags a bit mask of hints - */ - public synchronized void setHints(int flags) - { - hints = flags; - } - - /** - * Our ImageProducer calls setPixels to deliver a subset of its - * pixels. - * - * Each element of the pixels array represents one pixel. The - * pixel data is formatted according to the color model model. - * The x and y parameters are the coordinates of the rectangular - * region of pixels being delivered to this ImageConsumer, - * specified relative to the top left corner of the image being - * produced. Likewise, w and h are the pixel region's dimensions. - * - * @param x x coordinate of pixel block - * @param y y coordinate of pixel block - * @param w width of pixel block - * @param h height of pixel block - * @param model color model used to interpret pixel data - * @param pixels pixel block data - * @param offset offset into pixels array - * @param scansize width of one row in the pixel block - */ - public synchronized void setPixels(int x, int y, int w, int h, - ColorModel model, byte[] pixels, - int offset, int scansize) - { - ColorModel currentModel; - if (model != null) - currentModel = model; - else - currentModel = this.model; - - for(int yp = y; yp < (y + h); yp++) - { - for(int xp = x; xp < (x + w); xp++) - { - // Check if the coordinates (xp, yp) are within the - // pixel block that we are grabbing. - if(xp >= this.x - && yp >= this.y - && xp < (this.x + this.width) - && yp < (this.y + this.height)) - { - int i = (yp - this.y) * this.scansize + (xp - this.x) + this.offset; - int p = (yp - y) * scansize + (xp - x) + offset; - if (forceRGB) - { - ints_delivered = true; - - int_pixel_buffer[i] = currentModel.getRGB (pixels[p] & 0xFF); - } - else - { - bytes_delivered = true; - - byte_pixel_buffer[i] = pixels[p]; - } - } - } - } - } - - /** - * Our ImageProducer calls setPixels to deliver a subset of its - * pixels. - * - * Each element of the pixels array represents one pixel. The - * pixel data is formatted according to the color model model. - * The x and y parameters are the coordinates of the rectangular - * region of pixels being delivered to this ImageConsumer, - * specified relative to the top left corner of the image being - * produced. Likewise, w and h are the pixel region's dimensions. - * - * @param x x coordinate of pixel block - * @param y y coordinate of pixel block - * @param w width of pixel block - * @param h height of pixel block - * @param model color model used to interpret pixel data - * @param pixels pixel block data - * @param offset offset into pixels array - * @param scansize width of one row in the pixel block - */ - public synchronized void setPixels(int x, int y, int w, int h, - ColorModel model, int[] pixels, - int offset, int scansize) - { - ColorModel currentModel; - if (model != null) - currentModel = model; - else - currentModel = this.model; - - ints_delivered = true; - - for(int yp = y; yp < (y + h); yp++) - { - for(int xp = x; xp < (x + w); xp++) - { - // Check if the coordinates (xp, yp) are within the - // pixel block that we are grabbing. - if(xp >= this.x - && yp >= this.y - && xp < (this.x + this.width) - && yp < (this.y + this.height)) - { - int i = (yp - this.y) * this.scansize + (xp - this.x) + this.offset; - int p = (yp - y) * scansize + (xp - x) + offset; - if (forceRGB) - int_pixel_buffer[i] = currentModel.getRGB (pixels[p]); - else - int_pixel_buffer[i] = pixels[p]; - } - } - } - } - - /** - * Our <code>ImageProducer</code> calls this method to inform us - * that a single frame or the entire image is complete. The method - * is also used to inform us of an error in loading or producing the - * image. - * - * @param status the status of image production, represented by a - * bitwise OR of ImageConsumer flags - */ - public synchronized void imageComplete(int status) - { - consumerStatus = status; - setObserverStatus (); - grabbing = false; - if (ip != null) - ip.removeConsumer (this); - - notifyAll (); - } - - /** - * @return the return value of getStatus - * - * @specnote The newer getStatus should be used in place of status. - */ - public synchronized int status() - { - return getStatus(); - } -} |