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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [gnu/] [gcj/] [xlib/] [XImage.java] - Rev 781
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/* Copyright (C) 2000 Free Software Foundation This file is part of libgcj. This software is copyrighted work licensed under the terms of the Libgcj License. Please consult the file "LIBGCJ_LICENSE" for details. */ package gnu.gcj.xlib; import gnu.gcj.RawData; /** * Structure containing image data that resides on the client side. * The format, depth and offset attributes of an XImage determines how * bitfields are encoded in a raster image. However, it does not * determine how a color is encoded into a bitfield. I.e. the XImage * pixel values in a specific structure, but does not determine what * colors that will be used to represent these pixel values on the * screen. * * @author Rolf W. Rasmussen <rolfwr@ii.uib.no> */ public class XImage { /** This object reference points to the data, hindering garbage collection of the data. */ Object dataRef; // Must match definitions in X.h: public static final int XYBITMAP_FORMAT = 0, XYPIXMAP_FORMAT = 1, ZPIXMAP_FORMAT = 2; // Must match definitions in X.h: public static final int LEAST_SIGNIFICANT_B_FIRST_ORDER = 0, MOST_SIGNIFICANT_B_FIRST_ORDER = 1; public XImage(Visual visual, int depth, int format, int xoffset, int width, int height, int bitmapPad, int bytesPerLine) { this(visual, depth, format, xoffset, width, height, bitmapPad, bytesPerLine, 0 // bitsPerPixel ); } public XImage(Visual visual, int depth, int format, int xoffset, int width, int height, int bitmapPad, int bytesPerLine, int bitsPerPixel) { if (visual == null) throw new NullPointerException("a visual must be specified"); init(visual, depth, format, xoffset, width, height, bitmapPad, bytesPerLine, bitsPerPixel); } public native void init(Visual visual, int depth, int format, int xoffset, int width, int height, int bitmapPad, int bytesPerLine, int bitsPerPixel); private native void init(Visual visual, int width, int height); public XImage(Visual visual, int width, int height) { this(visual, width, height, true // Automatically allocate memory ); } /** * Create a new XImage. * * @param allocate specifies whether to automatically allocate * memory for the image. It is possible to create the data array * elsewhere, so that we can for instance use a DataBufferUShort as * data. Ie. not limit ourself to byte arrays. This is done by * passing false and calling a setData() method manually after * creation. */ public XImage(Visual visual, int width, int height, boolean allocate) { if (visual == null) throw new NullPointerException("a visual must be specified"); init(visual, width, height); if (allocate) { /* Now that Xlib has figured out the appropriate bytes per line, we can allocate memory for the image. */ // FIXME: What about formats with several layers/bands? byte[] data = new byte[getBytesPerLine()*height]; setData(data, 0); } } /** * Attach image data to this XImage. * * @param offset the index of the first actual data element in the array. */ public void setData(byte[] data, int offset) { dataRef = data; internalSetData(data, offset); } /** * Attach image data to this XImage. * * @param offset the index of the first actual data element in the * array. Note: this is short offset, not a byte offset. */ public void setData(short[] data, int offset) { dataRef = data; internalSetData(data, offset); } /** * Attach image data to this XImage * * @param offset the index of the first actual data element in the array. * Note: this is not a byte offset. */ public void setData(int[] data, int offset) { dataRef = data; internalSetData(data, offset); } private native void internalSetData(byte[] data, int offset); private native void internalSetData(short[] data, int offset); private native void internalSetData(int[] data, int offset); protected native void finalize(); boolean ownsData = false; RawData structure = null; public final native int getWidth(); public final native int getHeight(); public final native int getDepth(); public final native int getFormat(); public final boolean isZPixmapFormat() { return getFormat() == ZPIXMAP_FORMAT; } /** * Get the xoffset. The xoffset avoids the need of shifting the * scanlines into place. */ public final native int getXOffset(); public native final int getBytesPerLine(); public native final int getBitsPerPixel(); public native final int getImageByteOrder(); public native final int getBitmapBitOrder(); public native final int getBitmapUnit(); public native final int getBitmapPad(); // True/Direct Color specific: public native int getRedMask(); public native int getGreenMask(); public native int getBlueMask(); /** * Set a pixel value at a given position in the image. This method * is slow. Don't use it, except as a fall-back. */ public native final void setPixel(int x, int y, int pixel); public String toString() { String format; switch(getFormat()) { case ZPIXMAP_FORMAT: format = "ZPixmapFormat"; break; default: format = "unknown"; } String imageByteOrder; switch(getImageByteOrder()) { case LEAST_SIGNIFICANT_B_FIRST_ORDER: imageByteOrder = "leastSignificantByteFirst"; break; case MOST_SIGNIFICANT_B_FIRST_ORDER: imageByteOrder = "mostSignificantByteFirst"; break; default: imageByteOrder = "unknwon"; } String bitmapBitOrder; switch(getBitmapBitOrder()) { case LEAST_SIGNIFICANT_B_FIRST_ORDER: bitmapBitOrder = "leastSignificantBitFirst"; break; case MOST_SIGNIFICANT_B_FIRST_ORDER: bitmapBitOrder = "mostSignificantBitFirst"; break; default: bitmapBitOrder = "unknown"; } return getClass().getName() + "[" + format + ", width=" + getWidth() + ", height=" + getHeight() + ", bytesPerLine=" + getBytesPerLine() + ", xoffset=" + getXOffset() + ", depth=" + getDepth() + ", bitsPerPixel=" + getBitsPerPixel() + ", bitmapUnit=" + getBitmapUnit() + ", bitmapPad=" + getBitmapPad() + ", byteOrder=" + imageByteOrder + ", bitOrder=" + bitmapBitOrder + "]"; } }
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