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1: /* GraphicsConfiguration.java -- describes characteristics of graphics 2: Copyright (C) 2000, 2001, 2002 Free Software Foundation 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package java.awt; 40: 41: import java.awt.geom.AffineTransform; 42: import java.awt.image.BufferedImage; 43: import java.awt.image.ColorModel; 44: import java.awt.image.VolatileImage; 45: 46: /** 47: * This class describes the configuration of various graphics devices, such 48: * as a monitor or printer. Different configurations may exist for the same 49: * device, according to the different native modes supported. 50: * 51: * <p>Virtual devices are supported (for example, in a multiple screen 52: * environment, a virtual device covers all screens simultaneously); the 53: * configuration will have a non-zero relative coordinate system in such 54: * a case. 55: * 56: * @author Eric Blake (ebb9@email.byu.edu) 57: * @see Window 58: * @see Frame 59: * @see GraphicsEnvironment 60: * @see GraphicsDevice 61: * @since 1.0 62: * @status updated to 1.4 63: */ 64: public abstract class GraphicsConfiguration 65: { 66: 67: /** The cached image capabilities. */ 68: private ImageCapabilities imageCapabilities; 69: 70: /** The cached buffer capabilities. */ 71: private BufferCapabilities bufferCapabilities; 72: 73: /** 74: * The default constructor. 75: * 76: * @see GraphicsDevice#getConfigurations() 77: * @see GraphicsDevice#getDefaultConfiguration() 78: * @see GraphicsDevice#getBestConfiguration(GraphicsConfigTemplate) 79: * @see Graphics2D#getDeviceConfiguration() 80: */ 81: protected GraphicsConfiguration () 82: { 83: } 84: 85: /** 86: * Gets the associated device that this configuration describes. 87: * 88: * @return the device 89: */ 90: public abstract GraphicsDevice getDevice(); 91: 92: /** 93: * Returns a buffered image optimized to this device, so that blitting can 94: * be supported in the buffered image. 95: * 96: * @param w the width of the buffer 97: * @param h the height of the buffer 98: * @return the buffered image, or null if none is supported 99: */ 100: public abstract BufferedImage createCompatibleImage(int w, int h); 101: 102: /** 103: * Returns a buffered volatile image optimized to this device, so that 104: * blitting can be supported in the buffered image. Because the buffer is 105: * volatile, it can be optimized by native graphics accelerators. 106: * 107: * @param w the width of the buffer 108: * @param h the height of the buffer 109: * @return the buffered image, or null if none is supported 110: * @see Component#createVolatileImage(int, int) 111: * @since 1.4 112: */ 113: public abstract VolatileImage createCompatibleVolatileImage(int w, int h); 114: 115: /** 116: * Returns a buffered volatile image optimized to this device, and with the 117: * given capabilities, so that blitting can be supported in the buffered 118: * image. Because the buffer is volatile, it can be optimized by native 119: * graphics accelerators. 120: * 121: * @param w the width of the buffer 122: * @param h the height of the buffer 123: * @param caps the desired capabilities of the image buffer 124: * @return the buffered image, or null if none is supported 125: * @throws AWTException if the capabilities cannot be met 126: * @since 1.4 127: */ 128: public VolatileImage createCompatibleVolatileImage(int w, int h, 129: ImageCapabilities caps) 130: throws AWTException 131: { 132: // Must be overridden by implementations to check caps. 133: return createCompatibleVolatileImage(w, h); 134: } 135: 136: /** 137: * Returns a buffered volatile image optimized to this device, and 138: * with the given transparency. Because the buffer is volatile, it 139: * can be optimized by native graphics accelerators. 140: * 141: * @param width the width of the buffer 142: * @param height the height of the buffer 143: * @param transparency the transparency value for the buffer 144: * @return the buffered image, or null if none is supported 145: * @since 1.5 146: */ 147: public abstract VolatileImage createCompatibleVolatileImage(int width, 148: int height, 149: int transparency); 150: 151: /** 152: * Creates a volatile image with the specified capabilities and transparency. 153: * If the backend cannot meet the requested capabilities and transparency, 154: * an AWTException is thrown. 155: * 156: * @param width the width of the image 157: * @param height the height of the image 158: * @param caps the requested capabilities 159: * @param transparency the required transparency 160: * 161: * @return a volatile image with the specified capabilites and transparency 162: * 163: * @throws AWTException if the required capabilities and transparency cannot 164: * be met 165: * 166: * @since 1.5 167: */ 168: public VolatileImage createCompatibleVolatileImage(int width, int height, 169: ImageCapabilities caps, 170: int transparency) 171: throws AWTException 172: { 173: // Must be overridden by implementations to check caps. 174: return createCompatibleVolatileImage(width, height, transparency); 175: } 176: 177: /** 178: * Returns a buffered image optimized to this device, and with the specified 179: * transparency, so that blitting can be supported in the buffered image. 180: * 181: * @param w the width of the buffer 182: * @param h the height of the buffer 183: * @param transparency the transparency of the buffer 184: * @return the buffered image, or null if none is supported 185: * @see Transparency#OPAQUE 186: * @see Transparency#BITMASK 187: * @see Transparency#TRANSLUCENT 188: */ 189: public abstract BufferedImage createCompatibleImage(int w, int h, 190: int transparency); 191: 192: /** 193: * Gets the color model of the corresponding device. 194: * 195: * @return the color model 196: */ 197: public abstract ColorModel getColorModel(); 198: 199: /** 200: * Gets a color model for the corresponding device which supports the desired 201: * transparency level. 202: * 203: * @param transparency the transparency of the model 204: * @return the color model, with transparency 205: * @see Transparency#OPAQUE 206: * @see Transparency#BITMASK 207: * @see Transparency#TRANSLUCENT 208: */ 209: public abstract ColorModel getColorModel(int transparency); 210: 211: /** 212: * Returns a transform that maps user coordinates to device coordinates. The 213: * preferred mapping is about 72 user units to 1 inch (2.54 cm) of physical 214: * space. This is often the identity transform. The device coordinates have 215: * the origin at the upper left, with increasing x to the right, and 216: * increasing y to the bottom. 217: * 218: * @return the transformation from user space to device space 219: * @see #getNormalizingTransform() 220: */ 221: public abstract AffineTransform getDefaultTransform(); 222: 223: /** 224: * Returns a transform that maps user coordinates to device coordinates. The 225: * exact mapping is 72 user units to 1 inch (2.54 cm) of physical space. 226: * This is often the identity transform. The device coordinates have the 227: * origin at the upper left, with increasing x to the right, and increasing 228: * y to the bottom. Note that this is more accurate (and thus, sometimes more 229: * costly) than the default transform. 230: * 231: * @return the normalized transformation from user space to device space 232: * @see #getDefaultTransform() 233: */ 234: public abstract AffineTransform getNormalizingTransform(); 235: 236: /** 237: * Returns the bounds of the configuration, in device coordinates. If this 238: * is a virtual device (for example, encompassing several screens), the 239: * bounds may have a non-zero origin. 240: * 241: * @return the device bounds 242: * @since 1.3 243: */ 244: public abstract Rectangle getBounds(); 245: 246: /** 247: * Returns the buffering capabilities of this configuration. 248: * 249: * @return the buffer capabilities 250: * @since 1.4 251: */ 252: public BufferCapabilities getBufferCapabilities() 253: { 254: if (imageCapabilities == null) 255: getImageCapabilities(); 256: 257: if (bufferCapabilities == null) 258: bufferCapabilities = new BufferCapabilities(imageCapabilities, 259: imageCapabilities, null); 260: return bufferCapabilities; 261: } 262: 263: /** 264: * Returns the imaging capabilities of this configuration. 265: * 266: * @return the image capabilities 267: * @since 1.4 268: */ 269: public ImageCapabilities getImageCapabilities() 270: { 271: if (imageCapabilities == null) 272: imageCapabilities = new ImageCapabilities(false); 273: return imageCapabilities; 274: } 275: } // class GraphicsConfiguration
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