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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 2006, 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 | + | |
| 26 | +/*- | |
| 27 | + * Reads GIF images from an InputStream and reports the | |
| 28 | + * image data to an InputStreamImageSource object. | |
| 29 | + * | |
| 30 | + * The algorithm is copyright of CompuServe. | |
| 31 | + */ | |
| 32 | +package sun.awt.image; | |
| 33 | + | |
| 34 | +import java.util.Vector; | |
| 35 | +import java.util.Hashtable; | |
| 36 | +import java.io.InputStream; | |
| 37 | +import java.io.IOException; | |
| 38 | +import java.awt.image.*; | |
| 39 | + | |
| 40 | +/** | |
| 41 | + * Gif Image converter | |
| 42 | + * | |
| 43 | + * @author Arthur van Hoff | |
| 44 | + * @author Jim Graham | |
| 45 | + */ | |
| 46 | +public class GifImageDecoder extends ImageDecoder { | |
| 47 | + private static final boolean verbose = false; | |
| 48 | + | |
| 49 | + private static final int IMAGESEP = 0x2c; | |
| 50 | + private static final int EXBLOCK = 0x21; | |
| 51 | + private static final int EX_GRAPHICS_CONTROL= 0xf9; | |
| 52 | + private static final int EX_COMMENT = 0xfe; | |
| 53 | + private static final int EX_APPLICATION = 0xff; | |
| 54 | + private static final int TERMINATOR = 0x3b; | |
| 55 | + private static final int TRANSPARENCYMASK = 0x01; | |
| 56 | + private static final int INTERLACEMASK = 0x40; | |
| 57 | + private static final int COLORMAPMASK = 0x80; | |
| 58 | + | |
| 59 | + int num_global_colors; | |
| 60 | + byte[] global_colormap; | |
| 61 | + int trans_pixel = -1; | |
| 62 | + IndexColorModel global_model; | |
| 63 | + | |
| 64 | + Hashtable props = new Hashtable(); | |
| 65 | + | |
| 66 | + byte[] saved_image; | |
| 67 | + IndexColorModel saved_model; | |
| 68 | + | |
| 69 | + int global_width; | |
| 70 | + int global_height; | |
| 71 | + int global_bgpixel; | |
| 72 | + | |
| 73 | + GifFrame curframe; | |
| 74 | + | |
| 75 | + public GifImageDecoder(InputStreamImageSource src, InputStream is) { | |
| 76 | + super(src, is); | |
| 77 | + } | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * An error has occurred. Throw an exception. | |
| 81 | + */ | |
| 82 | + private static void error(String s1) throws ImageFormatException { | |
| 83 | + throw new ImageFormatException(s1); | |
| 84 | + } | |
| 85 | + | |
| 86 | + /** | |
| 87 | + * Read a number of bytes into a buffer. | |
| 88 | + * @return number of bytes that were not read due to EOF or error | |
| 89 | + */ | |
| 90 | + private int readBytes(byte buf[], int off, int len) { | |
| 91 | + while (len > 0) { | |
| 92 | + try { | |
| 93 | + int n = input.read(buf, off, len); | |
| 94 | + if (n < 0) { | |
| 95 | + break; | |
| 96 | + } | |
| 97 | + off += n; | |
| 98 | + len -= n; | |
| 99 | + } catch (IOException e) { | |
| 100 | + break; | |
| 101 | + } | |
| 102 | + } | |
| 103 | + return len; | |
| 104 | + } | |
| 105 | + | |
| 106 | + private static final int ExtractByte(byte buf[], int off) { | |
| 107 | + return (buf[off] & 0xFF); | |
| 108 | + } | |
| 109 | + | |
| 110 | + private static final int ExtractWord(byte buf[], int off) { | |
| 111 | + return (buf[off] & 0xFF) | ((buf[off + 1] & 0xFF) << 8); | |
| 112 | + } | |
| 113 | + | |
| 114 | + /** | |
| 115 | + * produce an image from the stream. | |
| 116 | + */ | |
| 117 | + public void produceImage() throws IOException, ImageFormatException { | |
| 118 | + try { | |
| 119 | + readHeader(); | |
| 120 | + | |
| 121 | + int totalframes = 0; | |
| 122 | + int frameno = 0; | |
| 123 | + int nloops = -1; | |
| 124 | + int disposal_method = 0; | |
| 125 | + int delay = -1; | |
| 126 | + boolean loopsRead = false; | |
| 127 | + boolean isAnimation = false; | |
| 128 | + | |
| 129 | + while (!aborted) { | |
| 130 | + int code; | |
| 131 | + | |
| 132 | + switch (code = input.read()) { | |
| 133 | + case EXBLOCK: | |
| 134 | + switch (code = input.read()) { | |
| 135 | + case EX_GRAPHICS_CONTROL: { | |
| 136 | + byte buf[] = new byte[6]; | |
| 137 | + if (readBytes(buf, 0, 6) != 0) { | |
| 138 | + return;//error("corrupt GIF file"); | |
| 139 | + } | |
| 140 | + if ((buf[0] != 4) || (buf[5] != 0)) { | |
| 141 | + return;//error("corrupt GIF file (GCE size)"); | |
| 142 | + } | |
| 143 | + // Get the index of the transparent color | |
| 144 | + delay = ExtractWord(buf, 2) * 10; | |
| 145 | + if (delay > 0 && !isAnimation) { | |
| 146 | + isAnimation = true; | |
| 147 | + ImageFetcher.startingAnimation(); | |
| 148 | + } | |
| 149 | + disposal_method = (buf[1] >> 2) & 7; | |
| 150 | + if ((buf[1] & TRANSPARENCYMASK) != 0) { | |
| 151 | + trans_pixel = ExtractByte(buf, 4); | |
| 152 | + } else { | |
| 153 | + trans_pixel = -1; | |
| 154 | + } | |
| 155 | + break; | |
| 156 | + } | |
| 157 | + | |
| 158 | + case EX_COMMENT: | |
| 159 | + case EX_APPLICATION: | |
| 160 | + default: | |
| 161 | + boolean loop_tag = false; | |
| 162 | + String comment = ""; | |
| 163 | + while (true) { | |
| 164 | + int n = input.read(); | |
| 165 | + if (n <= 0) { | |
| 166 | + break; | |
| 167 | + } | |
| 168 | + byte buf[] = new byte[n]; | |
| 169 | + if (readBytes(buf, 0, n) != 0) { | |
| 170 | + return;//error("corrupt GIF file"); | |
| 171 | + } | |
| 172 | + if (code == EX_COMMENT) { | |
| 173 | + comment += new String(buf, 0); | |
| 174 | + } else if (code == EX_APPLICATION) { | |
| 175 | + if (loop_tag) { | |
| 176 | + if (n == 3 && buf[0] == 1) { | |
| 177 | + if (loopsRead) { | |
| 178 | + ExtractWord(buf, 1); | |
| 179 | + } | |
| 180 | + else { | |
| 181 | + nloops = ExtractWord(buf, 1); | |
| 182 | + loopsRead = true; | |
| 183 | + } | |
| 184 | + } else { | |
| 185 | + loop_tag = false; | |
| 186 | + } | |
| 187 | + } | |
| 188 | + if ("NETSCAPE2.0".equals(new String(buf, 0))) { | |
| 189 | + loop_tag = true; | |
| 190 | + } | |
| 191 | + } | |
| 192 | + } | |
| 193 | + if (code == EX_COMMENT) { | |
| 194 | + props.put("comment", comment); | |
| 195 | + } | |
| 196 | + if (loop_tag && !isAnimation) { | |
| 197 | + isAnimation = true; | |
| 198 | + ImageFetcher.startingAnimation(); | |
| 199 | + } | |
| 200 | + break; | |
| 201 | + | |
| 202 | + case -1: | |
| 203 | + return; //error("corrupt GIF file"); | |
| 204 | + } | |
| 205 | + break; | |
| 206 | + | |
| 207 | + case IMAGESEP: | |
| 208 | + if (!isAnimation) { | |
| 209 | + input.mark(0); // we don't need the mark buffer | |
| 210 | + } | |
| 211 | + try { | |
| 212 | + if (!readImage(totalframes == 0, | |
| 213 | + disposal_method, | |
| 214 | + delay)) { | |
| 215 | + return; | |
| 216 | + } | |
| 217 | + } catch (Exception e) { | |
| 218 | + if (verbose) { | |
| 219 | + e.printStackTrace(); | |
| 220 | + } | |
| 221 | + return; | |
| 222 | + } | |
| 223 | + frameno++; | |
| 224 | + totalframes++; | |
| 225 | + break; | |
| 226 | + | |
| 227 | + default: | |
| 228 | + case -1: | |
| 229 | + if (verbose) { | |
| 230 | + if (code == -1) { | |
| 231 | + System.err.println("Premature EOF in GIF file," + | |
| 232 | + " frame " + frameno); | |
| 233 | + } else { | |
| 234 | + System.err.println("corrupt GIF file (parse) [" | |
| 235 | + + code + "]."); | |
| 236 | + } | |
| 237 | + } | |
| 238 | + if (frameno == 0) { | |
| 239 | + return; | |
| 240 | + } | |
| 241 | + // NOBREAK | |
| 242 | + | |
| 243 | + case TERMINATOR: | |
| 244 | + if (nloops == 0 || nloops-- >= 0) { | |
| 245 | + try { | |
| 246 | + if (curframe != null) { | |
| 247 | + curframe.dispose(); | |
| 248 | + curframe = null; | |
| 249 | + } | |
| 250 | + input.reset(); | |
| 251 | + saved_image = null; | |
| 252 | + saved_model = null; | |
| 253 | + frameno = 0; | |
| 254 | + break; | |
| 255 | + } catch (IOException e) { | |
| 256 | + return; // Unable to reset input buffer | |
| 257 | + } | |
| 258 | + } | |
| 259 | + if (verbose && frameno != 1) { | |
| 260 | + System.out.println("processing GIF terminator," | |
| 261 | + + " frames: " + frameno | |
| 262 | + + " total: " + totalframes); | |
| 263 | + } | |
| 264 | + imageComplete(ImageConsumer.STATICIMAGEDONE, true); | |
| 265 | + return; | |
| 266 | + } | |
| 267 | + } | |
| 268 | + } finally { | |
| 269 | + close(); | |
| 270 | + } | |
| 271 | + } | |
| 272 | + | |
| 273 | + /** | |
| 274 | + * Read Image header | |
| 275 | + */ | |
| 276 | + private void readHeader() throws IOException, ImageFormatException { | |
| 277 | + // Create a buffer | |
| 278 | + byte buf[] = new byte[13]; | |
| 279 | + | |
| 280 | + // Read the header | |
| 281 | + if (readBytes(buf, 0, 13) != 0) { | |
| 282 | + throw new IOException(); | |
| 283 | + } | |
| 284 | + | |
| 285 | + // Check header | |
| 286 | + if ((buf[0] != 'G') || (buf[1] != 'I') || (buf[2] != 'F')) { | |
| 287 | + error("not a GIF file."); | |
| 288 | + } | |
| 289 | + | |
| 290 | + // Global width&height | |
| 291 | + global_width = ExtractWord(buf, 6); | |
| 292 | + global_height = ExtractWord(buf, 8); | |
| 293 | + | |
| 294 | + // colormap info | |
| 295 | + int ch = ExtractByte(buf, 10); | |
| 296 | + if ((ch & COLORMAPMASK) == 0) { | |
| 297 | + // no global colormap so make up our own | |
| 298 | + // If there is a local colormap, it will override what we | |
| 299 | + // have here. If there is not a local colormap, the rules | |
| 300 | + // for GIF89 say that we can use whatever colormap we want. | |
| 301 | + // This means that we should probably put in a full 256 colormap | |
| 302 | + // at some point. REMIND! | |
| 303 | + num_global_colors = 2; | |
| 304 | + global_bgpixel = 0; | |
| 305 | + global_colormap = new byte[2*3]; | |
| 306 | + global_colormap[0] = global_colormap[1] = global_colormap[2] = (byte)0; | |
| 307 | + global_colormap[3] = global_colormap[4] = global_colormap[5] = (byte)255; | |
| 308 | + | |
| 309 | + } | |
| 310 | + else { | |
| 311 | + num_global_colors = 1 << ((ch & 0x7) + 1); | |
| 312 | + | |
| 313 | + global_bgpixel = ExtractByte(buf, 11); | |
| 314 | + | |
| 315 | + if (buf[12] != 0) { | |
| 316 | + props.put("aspectratio", ""+((ExtractByte(buf, 12) + 15) / 64.0)); | |
| 317 | + } | |
| 318 | + | |
| 319 | + // Read colors | |
| 320 | + global_colormap = new byte[num_global_colors * 3]; | |
| 321 | + if (readBytes(global_colormap, 0, num_global_colors * 3) != 0) { | |
| 322 | + throw new IOException(); | |
| 323 | + } | |
| 324 | + } | |
| 325 | + input.mark(Integer.MAX_VALUE); // set this mark in case this is an animated GIF | |
| 326 | + } | |
| 327 | + | |
| 328 | + /** | |
| 329 | + * The ImageConsumer hints flag for a non-interlaced GIF image. | |
| 330 | + */ | |
| 331 | + private static final int normalflags = | |
| 332 | + ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES | | |
| 333 | + ImageConsumer.SINGLEPASS | ImageConsumer.SINGLEFRAME; | |
| 334 | + | |
| 335 | + /** | |
| 336 | + * The ImageConsumer hints flag for an interlaced GIF image. | |
| 337 | + */ | |
| 338 | + private static final int interlaceflags = | |
| 339 | + ImageConsumer.RANDOMPIXELORDER | ImageConsumer.COMPLETESCANLINES | | |
| 340 | + ImageConsumer.SINGLEPASS | ImageConsumer.SINGLEFRAME; | |
| 341 | + | |
| 342 | + private short prefix[] = new short[4096]; | |
| 343 | + private byte suffix[] = new byte[4096]; | |
| 344 | + private byte outCode[] = new byte[4097]; | |
| 345 | + | |
| 346 | + private static native void initIDs(); | |
| 347 | + | |
| 348 | + static { | |
| 349 | + /* ensure that the necessary native libraries are loaded */ | |
| 350 | + NativeLibLoader.loadLibraries(); | |
| 351 | + initIDs(); | |
| 352 | + } | |
| 353 | + | |
| 354 | + private native boolean parseImage(int x, int y, int width, int height, | |
| 355 | + boolean interlace, int initCodeSize, | |
| 356 | + byte block[], byte rasline[], | |
| 357 | + IndexColorModel model); | |
| 358 | + | |
| 359 | + private int sendPixels(int x, int y, int width, int height, | |
| 360 | + byte rasline[], ColorModel model) { | |
| 361 | + int rasbeg, rasend, x2; | |
| 362 | + if (y < 0) { | |
| 363 | + height += y; | |
| 364 | + y = 0; | |
| 365 | + } | |
| 366 | + if (y + height > global_height) { | |
| 367 | + height = global_height - y; | |
| 368 | + } | |
| 369 | + if (height <= 0) { | |
| 370 | + return 1; | |
| 371 | + } | |
| 372 | + // rasline[0] == pixel at coordinate (x,y) | |
| 373 | + // rasline[width] == pixel at coordinate (x+width, y) | |
| 374 | + if (x < 0) { | |
| 375 | + rasbeg = -x; | |
| 376 | + width += x; // same as (width -= rasbeg) | |
| 377 | + x2 = 0; // same as (x2 = x + rasbeg) | |
| 378 | + } else { | |
| 379 | + rasbeg = 0; | |
| 380 | + // width -= 0; // same as (width -= rasbeg) | |
| 381 | + x2 = x; // same as (x2 = x + rasbeg) | |
| 382 | + } | |
| 383 | + // rasline[rasbeg] == pixel at coordinate (x2,y) | |
| 384 | + // rasline[width] == pixel at coordinate (x+width, y) | |
| 385 | + // rasline[rasbeg + width] == pixel at coordinate (x2+width, y) | |
| 386 | + if (x2 + width > global_width) { | |
| 387 | + width = global_width - x2; | |
| 388 | + } | |
| 389 | + if (width <= 0) { | |
| 390 | + return 1; | |
| 391 | + } | |
| 392 | + rasend = rasbeg + width; | |
| 393 | + // rasline[rasbeg] == pixel at coordinate (x2,y) | |
| 394 | + // rasline[rasend] == pixel at coordinate (x2+width, y) | |
| 395 | + int off = y * global_width + x2; | |
| 396 | + boolean save = (curframe.disposal_method == GifFrame.DISPOSAL_SAVE); | |
| 397 | + if (trans_pixel >= 0 && !curframe.initialframe) { | |
| 398 | + if (saved_image != null && model.equals(saved_model)) { | |
| 399 | + for (int i = rasbeg; i < rasend; i++, off++) { | |
| 400 | + byte pixel = rasline[i]; | |
| 401 | + if ((pixel & 0xff) == trans_pixel) { | |
| 402 | + rasline[i] = saved_image[off]; | |
| 403 | + } else if (save) { | |
| 404 | + saved_image[off] = pixel; | |
| 405 | + } | |
| 406 | + } | |
| 407 | + } else { | |
| 408 | + // We have to do this the hard way - only transmit | |
| 409 | + // the non-transparent sections of the line... | |
| 410 | + // Fix for 6301050: the interlacing is ignored in this case | |
| 411 | + // in order to avoid artefacts in case of animated images. | |
| 412 | + int runstart = -1; | |
| 413 | + int count = 1; | |
| 414 | + for (int i = rasbeg; i < rasend; i++, off++) { | |
| 415 | + byte pixel = rasline[i]; | |
| 416 | + if ((pixel & 0xff) == trans_pixel) { | |
| 417 | + if (runstart >= 0) { | |
| 418 | + count = setPixels(x + runstart, y, | |
| 419 | + i - runstart, 1, | |
| 420 | + model, rasline, | |
| 421 | + runstart, 0); | |
| 422 | + if (count == 0) { | |
| 423 | + break; | |
| 424 | + } | |
| 425 | + } | |
| 426 | + runstart = -1; | |
| 427 | + } else { | |
| 428 | + if (runstart < 0) { | |
| 429 | + runstart = i; | |
| 430 | + } | |
| 431 | + if (save) { | |
| 432 | + saved_image[off] = pixel; | |
| 433 | + } | |
| 434 | + } | |
| 435 | + } | |
| 436 | + if (runstart >= 0) { | |
| 437 | + count = setPixels(x + runstart, y, | |
| 438 | + rasend - runstart, 1, | |
| 439 | + model, rasline, | |
| 440 | + runstart, 0); | |
| 441 | + } | |
| 442 | + return count; | |
| 443 | + } | |
| 444 | + } else if (save) { | |
| 445 | + System.arraycopy(rasline, rasbeg, saved_image, off, width); | |
| 446 | + } | |
| 447 | + int count = setPixels(x2, y, width, height, model, | |
| 448 | + rasline, rasbeg, 0); | |
| 449 | + return count; | |
| 450 | + } | |
| 451 | + | |
| 452 | + /** | |
| 453 | + * Read Image data | |
| 454 | + */ | |
| 455 | + private boolean readImage(boolean first, int disposal_method, int delay) | |
| 456 | + throws IOException | |
| 457 | + { | |
| 458 | + if (curframe != null && !curframe.dispose()) { | |
| 459 | + abort(); | |
| 460 | + return false; | |
| 461 | + } | |
| 462 | + | |
| 463 | + long tm = 0; | |
| 464 | + | |
| 465 | + if (verbose) { | |
| 466 | + tm = System.currentTimeMillis(); | |
| 467 | + } | |
| 468 | + | |
| 469 | + // Allocate the buffer | |
| 470 | + byte block[] = new byte[256 + 3]; | |
| 471 | + | |
| 472 | + // Read the image descriptor | |
| 473 | + if (readBytes(block, 0, 10) != 0) { | |
| 474 | + throw new IOException(); | |
| 475 | + } | |
| 476 | + int x = ExtractWord(block, 0); | |
| 477 | + int y = ExtractWord(block, 2); | |
| 478 | + int width = ExtractWord(block, 4); | |
| 479 | + int height = ExtractWord(block, 6); | |
| 480 | + | |
| 481 | + /* | |
| 482 | + * Majority of gif images have | |
| 483 | + * same logical screen and frame dimensions. | |
| 484 | + * Also, Photoshop and Mozilla seem to use the logical | |
| 485 | + * screen dimension (from the global stream header) | |
| 486 | + * if frame dimension is invalid. | |
| 487 | + * | |
| 488 | + * We use similar heuristic and trying to recover | |
| 489 | + * frame width from logical screen dimension and | |
| 490 | + * frame offset. | |
| 491 | + */ | |
| 492 | + if (width == 0 && global_width != 0) { | |
| 493 | + width = global_width - x; | |
| 494 | + } | |
| 495 | + if (height == 0 && global_height != 0) { | |
| 496 | + height = global_height - y; | |
| 497 | + } | |
| 498 | + | |
| 499 | + boolean interlace = (block[8] & INTERLACEMASK) != 0; | |
| 500 | + | |
| 501 | + IndexColorModel model = global_model; | |
| 502 | + | |
| 503 | + if ((block[8] & COLORMAPMASK) != 0) { | |
| 504 | + // We read one extra byte above so now when we must | |
| 505 | + // transfer that byte as the first colormap byte | |
| 506 | + // and manually read the code size when we are done | |
| 507 | + int num_local_colors = 1 << ((block[8] & 0x7) + 1); | |
| 508 | + | |
| 509 | + // Read local colors | |
| 510 | + byte[] local_colormap = new byte[num_local_colors * 3]; | |
| 511 | + local_colormap[0] = block[9]; | |
| 512 | + if (readBytes(local_colormap, 1, num_local_colors * 3 - 1) != 0) { | |
| 513 | + throw new IOException(); | |
| 514 | + } | |
| 515 | + | |
| 516 | + // Now read the "real" code size byte which follows | |
| 517 | + // the local color table | |
| 518 | + if (readBytes(block, 9, 1) != 0) { | |
| 519 | + throw new IOException(); | |
| 520 | + } | |
| 521 | + if (trans_pixel >= num_local_colors) { | |
| 522 | + // Fix for 4233748: extend colormap to contain transparent pixel | |
| 523 | + num_local_colors = trans_pixel + 1; | |
| 524 | + local_colormap = grow_colormap(local_colormap, num_local_colors); | |
| 525 | + } | |
| 526 | + model = new IndexColorModel(8, num_local_colors, local_colormap, | |
| 527 | + 0, false, trans_pixel); | |
| 528 | + } else if (model == null | |
| 529 | + || trans_pixel != model.getTransparentPixel()) { | |
| 530 | + if (trans_pixel >= num_global_colors) { | |
| 531 | + // Fix for 4233748: extend colormap to contain transparent pixel | |
| 532 | + num_global_colors = trans_pixel + 1; | |
| 533 | + global_colormap = grow_colormap(global_colormap, num_global_colors); | |
| 534 | + } | |
| 535 | + model = new IndexColorModel(8, num_global_colors, global_colormap, | |
| 536 | + 0, false, trans_pixel); | |
| 537 | + global_model = model; | |
| 538 | + } | |
| 539 | + | |
| 540 | + // Notify the consumers | |
| 541 | + if (first) { | |
| 542 | + if (global_width == 0) global_width = width; | |
| 543 | + if (global_height == 0) global_height = height; | |
| 544 | + | |
| 545 | + setDimensions(global_width, global_height); | |
| 546 | + setProperties(props); | |
| 547 | + setColorModel(model); | |
| 548 | + headerComplete(); | |
| 549 | + } | |
| 550 | + | |
| 551 | + if (disposal_method == GifFrame.DISPOSAL_SAVE && saved_image == null) { | |
| 552 | + saved_image = new byte[global_width * global_height]; | |
| 553 | + /* | |
| 554 | + * If height of current image is smaller than the global height, | |
| 555 | + * fill the gap with transparent pixels. | |
| 556 | + */ | |
| 557 | + if ((height < global_height) && (model != null)) { | |
| 558 | + byte tpix = (byte)model.getTransparentPixel(); | |
| 559 | + if (tpix >= 0) { | |
| 560 | + byte trans_rasline[] = new byte[global_width]; | |
| 561 | + for (int i=0; i<global_width;i++) { | |
| 562 | + trans_rasline[i] = tpix; | |
| 563 | + } | |
| 564 | + | |
| 565 | + setPixels(0, 0, global_width, y, | |
| 566 | + model, trans_rasline, 0, 0); | |
| 567 | + setPixels(0, y+height, global_width, | |
| 568 | + global_height-height-y, model, trans_rasline, | |
| 569 | + 0, 0); | |
| 570 | + } | |
| 571 | + } | |
| 572 | + } | |
| 573 | + | |
| 574 | + int hints = (interlace ? interlaceflags : normalflags); | |
| 575 | + setHints(hints); | |
| 576 | + | |
| 577 | + curframe = new GifFrame(this, disposal_method, delay, | |
| 578 | + (curframe == null), model, | |
| 579 | + x, y, width, height); | |
| 580 | + | |
| 581 | + // allocate the raster data | |
| 582 | + byte rasline[] = new byte[width]; | |
| 583 | + | |
| 584 | + if (verbose) { | |
| 585 | + System.out.print("Reading a " + width + " by " + height + " " + | |
| 586 | + (interlace ? "" : "non-") + "interlaced image..."); | |
| 587 | + } | |
| 588 | + int initCodeSize = ExtractByte(block, 9); | |
| 589 | + if (initCodeSize >= 12) { | |
| 590 | + if (verbose) { | |
| 591 | + System.out.println("Invalid initial code size: " + | |
| 592 | + initCodeSize); | |
| 593 | + } | |
| 594 | + return false; | |
| 595 | + } | |
| 596 | + boolean ret = parseImage(x, y, width, height, | |
| 597 | + interlace, initCodeSize, | |
| 598 | + block, rasline, model); | |
| 599 | + | |
| 600 | + if (!ret) { | |
| 601 | + abort(); | |
| 602 | + } | |
| 603 | + | |
| 604 | + if (verbose) { | |
| 605 | + System.out.println("done in " | |
| 606 | + + (System.currentTimeMillis() - tm) | |
| 607 | + + "ms"); | |
| 608 | + } | |
| 609 | + | |
| 610 | + return ret; | |
| 611 | + } | |
| 612 | + | |
| 613 | + public static byte[] grow_colormap(byte[] colormap, int newlen) { | |
| 614 | + byte[] newcm = new byte[newlen * 3]; | |
| 615 | + System.arraycopy(colormap, 0, newcm, 0, colormap.length); | |
| 616 | + return newcm; | |
| 617 | + } | |
| 618 | +} | |
| 619 | + | |
| 620 | +class GifFrame { | |
| 621 | + private static final boolean verbose = false; | |
| 622 | + private static IndexColorModel trans_model; | |
| 623 | + | |
| 624 | + static final int DISPOSAL_NONE = 0x00; | |
| 625 | + static final int DISPOSAL_SAVE = 0x01; | |
| 626 | + static final int DISPOSAL_BGCOLOR = 0x02; | |
| 627 | + static final int DISPOSAL_PREVIOUS = 0x03; | |
| 628 | + | |
| 629 | + GifImageDecoder decoder; | |
| 630 | + | |
| 631 | + int disposal_method; | |
| 632 | + int delay; | |
| 633 | + | |
| 634 | + IndexColorModel model; | |
| 635 | + | |
| 636 | + int x; | |
| 637 | + int y; | |
| 638 | + int width; | |
| 639 | + int height; | |
| 640 | + | |
| 641 | + boolean initialframe; | |
| 642 | + | |
| 643 | + public GifFrame(GifImageDecoder id, int dm, int dl, boolean init, | |
| 644 | + IndexColorModel cm, int x, int y, int w, int h) { | |
| 645 | + this.decoder = id; | |
| 646 | + this.disposal_method = dm; | |
| 647 | + this.delay = dl; | |
| 648 | + this.model = cm; | |
| 649 | + this.initialframe = init; | |
| 650 | + this.x = x; | |
| 651 | + this.y = y; | |
| 652 | + this.width = w; | |
| 653 | + this.height = h; | |
| 654 | + } | |
| 655 | + | |
| 656 | + private void setPixels(int x, int y, int w, int h, | |
| 657 | + ColorModel cm, byte[] pix, int off, int scan) { | |
| 658 | + decoder.setPixels(x, y, w, h, cm, pix, off, scan); | |
| 659 | + } | |
| 660 | + | |
| 661 | + public boolean dispose() { | |
| 662 | + if (decoder.imageComplete(ImageConsumer.SINGLEFRAMEDONE, false) == 0) { | |
| 663 | + return false; | |
| 664 | + } else { | |
| 665 | + if (delay > 0) { | |
| 666 | + try { | |
| 667 | + if (verbose) { | |
| 668 | + System.out.println("sleeping: "+delay); | |
| 669 | + } | |
| 670 | + Thread.sleep(delay); | |
| 671 | + } catch (InterruptedException e) { | |
| 672 | + return false; | |
| 673 | + } | |
| 674 | + } else { | |
| 675 | + Thread.yield(); | |
| 676 | + } | |
| 677 | + | |
| 678 | + if (verbose && disposal_method != 0) { | |
| 679 | + System.out.println("disposal method: "+disposal_method); | |
| 680 | + } | |
| 681 | + | |
| 682 | + int global_width = decoder.global_width; | |
| 683 | + int global_height = decoder.global_height; | |
| 684 | + | |
| 685 | + if (x < 0) { | |
| 686 | + width += x; | |
| 687 | + x = 0; | |
| 688 | + } | |
| 689 | + if (x + width > global_width) { | |
| 690 | + width = global_width - x; | |
| 691 | + } | |
| 692 | + if (width <= 0) { | |
| 693 | + disposal_method = DISPOSAL_NONE; | |
| 694 | + } else { | |
| 695 | + if (y < 0) { | |
| 696 | + height += y; | |
| 697 | + y = 0; | |
| 698 | + } | |
| 699 | + if (y + height > global_height) { | |
| 700 | + height = global_height - y; | |
| 701 | + } | |
| 702 | + if (height <= 0) { | |
| 703 | + disposal_method = DISPOSAL_NONE; | |
| 704 | + } | |
| 705 | + } | |
| 706 | + | |
| 707 | + switch (disposal_method) { | |
| 708 | + case DISPOSAL_PREVIOUS: | |
| 709 | + byte[] saved_image = decoder.saved_image; | |
| 710 | + IndexColorModel saved_model = decoder.saved_model; | |
| 711 | + if (saved_image != null) { | |
| 712 | + setPixels(x, y, width, height, | |
| 713 | + saved_model, saved_image, | |
| 714 | + y * global_width + x, global_width); | |
| 715 | + } | |
| 716 | + break; | |
| 717 | + case DISPOSAL_BGCOLOR: | |
| 718 | + byte tpix; | |
| 719 | + if (model.getTransparentPixel() < 0) { | |
| 720 | + model = trans_model; | |
| 721 | + if (model == null) { | |
| 722 | + model = new IndexColorModel(8, 1, | |
| 723 | + new byte[4], 0, true); | |
| 724 | + trans_model = model; | |
| 725 | + } | |
| 726 | + tpix = 0; | |
| 727 | + } else { | |
| 728 | + tpix = (byte) model.getTransparentPixel(); | |
| 729 | + } | |
| 730 | + byte[] rasline = new byte[width]; | |
| 731 | + if (tpix != 0) { | |
| 732 | + for (int i = 0; i < width; i++) { | |
| 733 | + rasline[i] = tpix; | |
| 734 | + } | |
| 735 | + } | |
| 736 | + | |
| 737 | + // clear saved_image using transparent pixels | |
| 738 | + // this will be used as the background in the next display | |
| 739 | + if( decoder.saved_image != null ) { | |
| 740 | + for( int i = 0; i < global_width * global_height; i ++ ) | |
| 741 | + decoder.saved_image[i] = tpix; | |
| 742 | + } | |
| 743 | + | |
| 744 | + setPixels(x, y, width, height, model, rasline, 0, 0); | |
| 745 | + break; | |
| 746 | + case DISPOSAL_SAVE: | |
| 747 | + decoder.saved_model = model; | |
| 748 | + break; | |
| 749 | + } | |
| 750 | + } | |
| 751 | + return true; | |
| 752 | + } | |
| 753 | +} | |