1/* 2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package sun.java2d.opengl; 27 28import java.awt.AlphaComposite; 29import java.awt.Composite; 30import java.awt.GraphicsEnvironment; 31import java.awt.Rectangle; 32import java.awt.Transparency; 33import java.awt.image.ColorModel; 34import java.awt.image.Raster; 35import sun.awt.SunHints; 36import sun.awt.image.PixelConverter; 37import sun.java2d.pipe.hw.AccelSurface; 38import sun.java2d.SunGraphics2D; 39import sun.java2d.SurfaceData; 40import sun.java2d.SurfaceDataProxy; 41import sun.java2d.loops.CompositeType; 42import sun.java2d.loops.GraphicsPrimitive; 43import sun.java2d.loops.MaskFill; 44import sun.java2d.loops.SurfaceType; 45import sun.java2d.pipe.ParallelogramPipe; 46import sun.java2d.pipe.PixelToParallelogramConverter; 47import sun.java2d.pipe.RenderBuffer; 48import sun.java2d.pipe.TextPipe; 49import static sun.java2d.pipe.BufferedOpCodes.*; 50import static sun.java2d.opengl.OGLContext.OGLContextCaps.*; 51 52/** 53 * This class describes an OpenGL "surface", that is, a region of pixels 54 * managed via OpenGL. An OGLSurfaceData can be tagged with one of three 55 * different SurfaceType objects for the purpose of registering loops, etc. 56 * This diagram shows the hierarchy of OGL SurfaceTypes: 57 * 58 * Any 59 * / \ 60 * OpenGLSurface OpenGLTexture 61 * | 62 * OpenGLSurfaceRTT 63 * 64 * OpenGLSurface 65 * This kind of surface can be rendered to using OpenGL APIs. It is also 66 * possible to copy an OpenGLSurface to another OpenGLSurface (or to itself). 67 * This is typically accomplished by calling MakeContextCurrent(dstSD, srcSD) 68 * and then calling glCopyPixels() (although there are other techniques to 69 * achieve the same goal). 70 * 71 * OpenGLTexture 72 * This kind of surface cannot be rendered to using OpenGL (in the same sense 73 * as in OpenGLSurface). However, it is possible to upload a region of pixels 74 * to an OpenGLTexture object via glTexSubImage2D(). One can also copy a 75 * surface of type OpenGLTexture to an OpenGLSurface by binding the texture 76 * to a quad and then rendering it to the destination surface (this process 77 * is known as "texture mapping"). 78 * 79 * OpenGLSurfaceRTT 80 * This kind of surface can be thought of as a sort of hybrid between 81 * OpenGLSurface and OpenGLTexture, in that one can render to this kind of 82 * surface as if it were of type OpenGLSurface, but the process of copying 83 * this kind of surface to another is more like an OpenGLTexture. (Note that 84 * "RTT" stands for "render-to-texture".) 85 * 86 * In addition to these SurfaceType variants, we have also defined some 87 * constants that describe in more detail the type of underlying OpenGL 88 * surface. This table helps explain the relationships between those 89 * "type" constants and their corresponding SurfaceType: 90 * 91 * OGL Type Corresponding SurfaceType 92 * -------- ------------------------- 93 * WINDOW OpenGLSurface 94 * TEXTURE OpenGLTexture 95 * FLIP_BACKBUFFER OpenGLSurface 96 * FBOBJECT OpenGLSurfaceRTT 97 */ 98public abstract class OGLSurfaceData extends SurfaceData 99 implements AccelSurface { 100 101 /** 102 * OGL-specific surface types 103 * 104 * @see sun.java2d.pipe.hw.AccelSurface 105 */ 106 public static final int FBOBJECT = RT_TEXTURE; 107 108 /** 109 * Pixel formats 110 */ 111 public static final int PF_INT_ARGB = 0; 112 public static final int PF_INT_ARGB_PRE = 1; 113 public static final int PF_INT_RGB = 2; 114 public static final int PF_INT_RGBX = 3; 115 public static final int PF_INT_BGR = 4; 116 public static final int PF_INT_BGRX = 5; 117 public static final int PF_USHORT_565_RGB = 6; 118 public static final int PF_USHORT_555_RGB = 7; 119 public static final int PF_USHORT_555_RGBX = 8; 120 public static final int PF_BYTE_GRAY = 9; 121 public static final int PF_USHORT_GRAY = 10; 122 public static final int PF_3BYTE_BGR = 11; 123 124 /** 125 * SurfaceTypes 126 */ 127 private static final String DESC_OPENGL_SURFACE = "OpenGL Surface"; 128 private static final String DESC_OPENGL_SURFACE_RTT = 129 "OpenGL Surface (render-to-texture)"; 130 private static final String DESC_OPENGL_TEXTURE = "OpenGL Texture"; 131 132 static final SurfaceType OpenGLSurface = 133 SurfaceType.Any.deriveSubType(DESC_OPENGL_SURFACE, 134 PixelConverter.ArgbPre.instance); 135 static final SurfaceType OpenGLSurfaceRTT = 136 OpenGLSurface.deriveSubType(DESC_OPENGL_SURFACE_RTT); 137 static final SurfaceType OpenGLTexture = 138 SurfaceType.Any.deriveSubType(DESC_OPENGL_TEXTURE); 139 140 /** This will be true if the fbobject system property has been enabled. */ 141 private static boolean isFBObjectEnabled; 142 143 /** This will be true if the lcdshader system property has been enabled.*/ 144 private static boolean isLCDShaderEnabled; 145 146 /** This will be true if the biopshader system property has been enabled.*/ 147 private static boolean isBIOpShaderEnabled; 148 149 /** This will be true if the gradshader system property has been enabled.*/ 150 private static boolean isGradShaderEnabled; 151 152 private OGLGraphicsConfig graphicsConfig; 153 protected int type; 154 // these fields are set from the native code when the surface is 155 // initialized 156 private int nativeWidth, nativeHeight; 157 158 protected static OGLRenderer oglRenderPipe; 159 protected static PixelToParallelogramConverter oglTxRenderPipe; 160 protected static ParallelogramPipe oglAAPgramPipe; 161 protected static OGLTextRenderer oglTextPipe; 162 protected static OGLDrawImage oglImagePipe; 163 164 protected native boolean initTexture(long pData, 165 boolean isOpaque, boolean texNonPow2, 166 boolean texRect, 167 int width, int height); 168 protected native boolean initFBObject(long pData, 169 boolean isOpaque, boolean texNonPow2, 170 boolean texRect, 171 int width, int height); 172 protected native boolean initFlipBackbuffer(long pData); 173 174 private native int getTextureTarget(long pData); 175 private native int getTextureID(long pData); 176 177 static { 178 if (!GraphicsEnvironment.isHeadless()) { 179 // fbobject currently enabled by default; use "false" to disable 180 String fbo = java.security.AccessController.doPrivileged( 181 new sun.security.action.GetPropertyAction( 182 "sun.java2d.opengl.fbobject")); 183 isFBObjectEnabled = !"false".equals(fbo); 184 185 // lcdshader currently enabled by default; use "false" to disable 186 String lcd = java.security.AccessController.doPrivileged( 187 new sun.security.action.GetPropertyAction( 188 "sun.java2d.opengl.lcdshader")); 189 isLCDShaderEnabled = !"false".equals(lcd); 190 191 // biopshader currently enabled by default; use "false" to disable 192 String biop = java.security.AccessController.doPrivileged( 193 new sun.security.action.GetPropertyAction( 194 "sun.java2d.opengl.biopshader")); 195 isBIOpShaderEnabled = !"false".equals(biop); 196 197 // gradshader currently enabled by default; use "false" to disable 198 String grad = java.security.AccessController.doPrivileged( 199 new sun.security.action.GetPropertyAction( 200 "sun.java2d.opengl.gradshader")); 201 isGradShaderEnabled = !"false".equals(grad); 202 203 OGLRenderQueue rq = OGLRenderQueue.getInstance(); 204 oglImagePipe = new OGLDrawImage(); 205 oglTextPipe = new OGLTextRenderer(rq); 206 oglRenderPipe = new OGLRenderer(rq); 207 if (GraphicsPrimitive.tracingEnabled()) { 208 oglTextPipe = oglTextPipe.traceWrap(); 209 //The wrapped oglRenderPipe will wrap the AA pipe as well... 210 //oglAAPgramPipe = oglRenderPipe.traceWrap(); 211 } 212 oglAAPgramPipe = oglRenderPipe.getAAParallelogramPipe(); 213 oglTxRenderPipe = 214 new PixelToParallelogramConverter(oglRenderPipe, 215 oglRenderPipe, 216 1.0, 0.25, true); 217 218 OGLBlitLoops.register(); 219 OGLMaskFill.register(); 220 OGLMaskBlit.register(); 221 } 222 } 223 224 protected OGLSurfaceData(OGLGraphicsConfig gc, 225 ColorModel cm, int type) 226 { 227 super(getCustomSurfaceType(type), cm); 228 this.graphicsConfig = gc; 229 this.type = type; 230 setBlitProxyKey(gc.getProxyKey()); 231 } 232 233 @Override 234 public SurfaceDataProxy makeProxyFor(SurfaceData srcData) { 235 return OGLSurfaceDataProxy.createProxy(srcData, graphicsConfig); 236 } 237 238 /** 239 * Returns the appropriate SurfaceType corresponding to the given OpenGL 240 * surface type constant (e.g. TEXTURE -> OpenGLTexture). 241 */ 242 private static SurfaceType getCustomSurfaceType(int oglType) { 243 switch (oglType) { 244 case TEXTURE: 245 return OpenGLTexture; 246 case FBOBJECT: 247 return OpenGLSurfaceRTT; 248 default: 249 return OpenGLSurface; 250 } 251 } 252 253 /** 254 * Note: This should only be called from the QFT under the AWT lock. 255 * This method is kept separate from the initSurface() method below just 256 * to keep the code a bit cleaner. 257 */ 258 private void initSurfaceNow(int width, int height) { 259 boolean isOpaque = (getTransparency() == Transparency.OPAQUE); 260 boolean success = false; 261 262 switch (type) { 263 case TEXTURE: 264 success = initTexture(getNativeOps(), 265 isOpaque, isTexNonPow2Available(), 266 isTexRectAvailable(), 267 width, height); 268 break; 269 270 case FBOBJECT: 271 success = initFBObject(getNativeOps(), 272 isOpaque, isTexNonPow2Available(), 273 isTexRectAvailable(), 274 width, height); 275 break; 276 277 case FLIP_BACKBUFFER: 278 success = initFlipBackbuffer(getNativeOps()); 279 break; 280 281 default: 282 break; 283 } 284 285 if (!success) { 286 throw new OutOfMemoryError("can't create offscreen surface"); 287 } 288 } 289 290 /** 291 * Initializes the appropriate OpenGL offscreen surface based on the value 292 * of the type parameter. If the surface creation fails for any reason, 293 * an OutOfMemoryError will be thrown. 294 */ 295 protected void initSurface(final int width, final int height) { 296 OGLRenderQueue rq = OGLRenderQueue.getInstance(); 297 rq.lock(); 298 try { 299 switch (type) { 300 case TEXTURE: 301 case FBOBJECT: 302 // need to make sure the context is current before 303 // creating the texture or fbobject 304 OGLContext.setScratchSurface(graphicsConfig); 305 break; 306 default: 307 break; 308 } 309 rq.flushAndInvokeNow(new Runnable() { 310 public void run() { 311 initSurfaceNow(width, height); 312 } 313 }); 314 } finally { 315 rq.unlock(); 316 } 317 } 318 319 /** 320 * Returns the OGLContext for the GraphicsConfig associated with this 321 * surface. 322 */ 323 public final OGLContext getContext() { 324 return graphicsConfig.getContext(); 325 } 326 327 /** 328 * Returns the OGLGraphicsConfig associated with this surface. 329 */ 330 final OGLGraphicsConfig getOGLGraphicsConfig() { 331 return graphicsConfig; 332 } 333 334 /** 335 * Returns one of the surface type constants defined above. 336 */ 337 public final int getType() { 338 return type; 339 } 340 341 /** 342 * If this surface is backed by a texture object, returns the target 343 * for that texture (either GL_TEXTURE_2D or GL_TEXTURE_RECTANGLE_ARB). 344 * Otherwise, this method will return zero. 345 */ 346 public final int getTextureTarget() { 347 return getTextureTarget(getNativeOps()); 348 } 349 350 /** 351 * If this surface is backed by a texture object, returns the texture ID 352 * for that texture. 353 * Otherwise, this method will return zero. 354 */ 355 public final int getTextureID() { 356 return getTextureID(getNativeOps()); 357 } 358 359 /** 360 * Returns native resource of specified {@code resType} associated with 361 * this surface. 362 * 363 * Specifically, for {@code OGLSurfaceData} this method returns the 364 * the following: 365 * <pre> 366 * TEXTURE - texture id 367 * </pre> 368 * 369 * Note: the resource returned by this method is only valid on the rendering 370 * thread. 371 * 372 * @return native resource of specified type or 0L if 373 * such resource doesn't exist or can not be retrieved. 374 * @see sun.java2d.pipe.hw.AccelSurface#getNativeResource 375 */ 376 public long getNativeResource(int resType) { 377 if (resType == TEXTURE) { 378 return getTextureID(); 379 } 380 return 0L; 381 } 382 383 public Raster getRaster(int x, int y, int w, int h) { 384 throw new InternalError("not implemented yet"); 385 } 386 387 /** 388 * For now, we can only render LCD text if: 389 * - the fragment shader extension is available, and 390 * - the source color is opaque, and 391 * - blending is SrcOverNoEa or disabled 392 * - and the destination is opaque 393 * 394 * Eventually, we could enhance the native OGL text rendering code 395 * and remove the above restrictions, but that would require significantly 396 * more code just to support a few uncommon cases. 397 */ 398 public boolean canRenderLCDText(SunGraphics2D sg2d) { 399 return 400 graphicsConfig.isCapPresent(CAPS_EXT_LCD_SHADER) && 401 sg2d.surfaceData.getTransparency() == Transparency.OPAQUE && 402 sg2d.paintState <= SunGraphics2D.PAINT_OPAQUECOLOR && 403 (sg2d.compositeState <= SunGraphics2D.COMP_ISCOPY || 404 (sg2d.compositeState <= SunGraphics2D.COMP_ALPHA && canHandleComposite(sg2d.composite))); 405 } 406 407 private boolean canHandleComposite(Composite c) { 408 if (c instanceof AlphaComposite) { 409 AlphaComposite ac = (AlphaComposite)c; 410 411 return ac.getRule() == AlphaComposite.SRC_OVER && ac.getAlpha() >= 1f; 412 } 413 return false; 414 } 415 416 public void validatePipe(SunGraphics2D sg2d) { 417 TextPipe textpipe; 418 boolean validated = false; 419 420 // OGLTextRenderer handles both AA and non-AA text, but 421 // only works with the following modes: 422 // (Note: For LCD text we only enter this code path if 423 // canRenderLCDText() has already validated that the mode is 424 // CompositeType.SrcNoEa (opaque color), which will be subsumed 425 // by the CompositeType.SrcNoEa (any color) test below.) 426 427 if (/* CompositeType.SrcNoEa (any color) */ 428 (sg2d.compositeState <= SunGraphics2D.COMP_ISCOPY && 429 sg2d.paintState <= SunGraphics2D.PAINT_ALPHACOLOR) || 430 431 /* CompositeType.SrcOver (any color) */ 432 (sg2d.compositeState == SunGraphics2D.COMP_ALPHA && 433 sg2d.paintState <= SunGraphics2D.PAINT_ALPHACOLOR && 434 (((AlphaComposite)sg2d.composite).getRule() == 435 AlphaComposite.SRC_OVER)) || 436 437 /* CompositeType.Xor (any color) */ 438 (sg2d.compositeState == SunGraphics2D.COMP_XOR && 439 sg2d.paintState <= SunGraphics2D.PAINT_ALPHACOLOR)) 440 { 441 textpipe = oglTextPipe; 442 } else { 443 // do this to initialize textpipe correctly; we will attempt 444 // to override the non-text pipes below 445 super.validatePipe(sg2d); 446 textpipe = sg2d.textpipe; 447 validated = true; 448 } 449 450 PixelToParallelogramConverter txPipe = null; 451 OGLRenderer nonTxPipe = null; 452 453 if (sg2d.antialiasHint != SunHints.INTVAL_ANTIALIAS_ON) { 454 if (sg2d.paintState <= SunGraphics2D.PAINT_ALPHACOLOR) { 455 if (sg2d.compositeState <= SunGraphics2D.COMP_XOR) { 456 txPipe = oglTxRenderPipe; 457 nonTxPipe = oglRenderPipe; 458 } 459 } else if (sg2d.compositeState <= SunGraphics2D.COMP_ALPHA) { 460 if (OGLPaints.isValid(sg2d)) { 461 txPipe = oglTxRenderPipe; 462 nonTxPipe = oglRenderPipe; 463 } 464 // custom paints handled by super.validatePipe() below 465 } 466 } else { 467 if (sg2d.paintState <= SunGraphics2D.PAINT_ALPHACOLOR) { 468 if (graphicsConfig.isCapPresent(CAPS_PS30) && 469 (sg2d.imageComp == CompositeType.SrcOverNoEa || 470 sg2d.imageComp == CompositeType.SrcOver)) 471 { 472 if (!validated) { 473 super.validatePipe(sg2d); 474 validated = true; 475 } 476 PixelToParallelogramConverter aaConverter = 477 new PixelToParallelogramConverter(sg2d.shapepipe, 478 oglAAPgramPipe, 479 1.0/8.0, 0.499, 480 false); 481 sg2d.drawpipe = aaConverter; 482 sg2d.fillpipe = aaConverter; 483 sg2d.shapepipe = aaConverter; 484 } else if (sg2d.compositeState == SunGraphics2D.COMP_XOR) { 485 // install the solid pipes when AA and XOR are both enabled 486 txPipe = oglTxRenderPipe; 487 nonTxPipe = oglRenderPipe; 488 } 489 } 490 // other cases handled by super.validatePipe() below 491 } 492 493 if (txPipe != null) { 494 if (sg2d.transformState >= SunGraphics2D.TRANSFORM_TRANSLATESCALE) { 495 sg2d.drawpipe = txPipe; 496 sg2d.fillpipe = txPipe; 497 } else if (sg2d.strokeState != SunGraphics2D.STROKE_THIN) { 498 sg2d.drawpipe = txPipe; 499 sg2d.fillpipe = nonTxPipe; 500 } else { 501 sg2d.drawpipe = nonTxPipe; 502 sg2d.fillpipe = nonTxPipe; 503 } 504 // Note that we use the transforming pipe here because it 505 // will examine the shape and possibly perform an optimized 506 // operation if it can be simplified. The simplifications 507 // will be valid for all STROKE and TRANSFORM types. 508 sg2d.shapepipe = txPipe; 509 } else { 510 if (!validated) { 511 super.validatePipe(sg2d); 512 } 513 } 514 515 // install the text pipe based on our earlier decision 516 sg2d.textpipe = textpipe; 517 518 // always override the image pipe with the specialized OGL pipe 519 sg2d.imagepipe = oglImagePipe; 520 } 521 522 @Override 523 protected MaskFill getMaskFill(SunGraphics2D sg2d) { 524 if (sg2d.paintState > SunGraphics2D.PAINT_ALPHACOLOR) { 525 /* 526 * We can only accelerate non-Color MaskFill operations if 527 * all of the following conditions hold true: 528 * - there is an implementation for the given paintState 529 * - the current Paint can be accelerated for this destination 530 * - multitexturing is available (since we need to modulate 531 * the alpha mask texture with the paint texture) 532 * 533 * In all other cases, we return null, in which case the 534 * validation code will choose a more general software-based loop. 535 */ 536 if (!OGLPaints.isValid(sg2d) || 537 !graphicsConfig.isCapPresent(CAPS_MULTITEXTURE)) 538 { 539 return null; 540 } 541 } 542 return super.getMaskFill(sg2d); 543 } 544 545 @Override 546 public boolean copyArea(SunGraphics2D sg2d, int x, int y, int w, int h, 547 int dx, int dy) { 548 if (sg2d.compositeState >= SunGraphics2D.COMP_XOR) { 549 return false; 550 } 551 oglRenderPipe.copyArea(sg2d, x, y, w, h, dx, dy); 552 return true; 553 } 554 555 public void flush() { 556 invalidate(); 557 OGLRenderQueue rq = OGLRenderQueue.getInstance(); 558 rq.lock(); 559 try { 560 // make sure we have a current context before 561 // disposing the native resources (e.g. texture object) 562 OGLContext.setScratchSurface(graphicsConfig); 563 564 RenderBuffer buf = rq.getBuffer(); 565 rq.ensureCapacityAndAlignment(12, 4); 566 buf.putInt(FLUSH_SURFACE); 567 buf.putLong(getNativeOps()); 568 569 // this call is expected to complete synchronously, so flush now 570 rq.flushNow(); 571 } finally { 572 rq.unlock(); 573 } 574 } 575 576 /** 577 * Disposes the native resources associated with the given OGLSurfaceData 578 * (referenced by the pData parameter). This method is invoked from 579 * the native Dispose() method from the Disposer thread when the 580 * Java-level OGLSurfaceData object is about to go away. Note that we 581 * also pass a reference to the native GLX/WGLGraphicsConfigInfo 582 * (pConfigInfo) for the purposes of making a context current. 583 */ 584 static void dispose(long pData, long pConfigInfo) { 585 OGLRenderQueue rq = OGLRenderQueue.getInstance(); 586 rq.lock(); 587 try { 588 // make sure we have a current context before 589 // disposing the native resources (e.g. texture object) 590 OGLContext.setScratchSurface(pConfigInfo); 591 592 RenderBuffer buf = rq.getBuffer(); 593 rq.ensureCapacityAndAlignment(12, 4); 594 buf.putInt(DISPOSE_SURFACE); 595 buf.putLong(pData); 596 597 // this call is expected to complete synchronously, so flush now 598 rq.flushNow(); 599 } finally { 600 rq.unlock(); 601 } 602 } 603 604 static void swapBuffers(long window) { 605 OGLRenderQueue rq = OGLRenderQueue.getInstance(); 606 rq.lock(); 607 try { 608 RenderBuffer buf = rq.getBuffer(); 609 rq.ensureCapacityAndAlignment(12, 4); 610 buf.putInt(SWAP_BUFFERS); 611 buf.putLong(window); 612 rq.flushNow(); 613 } finally { 614 rq.unlock(); 615 } 616 } 617 618 /** 619 * Returns true if OpenGL textures can have non-power-of-two dimensions 620 * when using the basic GL_TEXTURE_2D target. 621 */ 622 boolean isTexNonPow2Available() { 623 return graphicsConfig.isCapPresent(CAPS_TEXNONPOW2); 624 } 625 626 /** 627 * Returns true if OpenGL textures can have non-power-of-two dimensions 628 * when using the GL_TEXTURE_RECTANGLE_ARB target (only available when the 629 * GL_ARB_texture_rectangle extension is present). 630 */ 631 boolean isTexRectAvailable() { 632 return graphicsConfig.isCapPresent(CAPS_EXT_TEXRECT); 633 } 634 635 public Rectangle getNativeBounds() { 636 OGLRenderQueue rq = OGLRenderQueue.getInstance(); 637 rq.lock(); 638 try { 639 return new Rectangle(nativeWidth, nativeHeight); 640 } finally { 641 rq.unlock(); 642 } 643 } 644 645 /** 646 * Returns true if the surface is an on-screen window surface or 647 * a FBO texture attached to an on-screen CALayer. 648 * 649 * Needed by Mac OS X port. 650 */ 651 boolean isOnScreen() { 652 return getType() == WINDOW; 653 } 654} 655