1/*--------------------------------------------------------------------------- 2 3 rpng2 - progressive-model PNG display program rpng2-win.c 4 5 This program decodes and displays PNG files progressively, as if it were 6 a web browser (though the front end is only set up to read from files). 7 It supports gamma correction, user-specified background colors, and user- 8 specified background patterns (for transparent images). This version is 9 for 32-bit Windows; it may compile under 16-bit Windows with a little 10 tweaking (or maybe not). Thanks to Adam Costello and Pieter S. van der 11 Meulen for the "diamond" and "radial waves" patterns, respectively. 12 13 to do (someday, maybe): 14 - handle quoted command-line args (especially filenames with spaces) 15 - finish resizable checkerboard-gradient (sizes 4-128?) 16 - use %.1023s to simplify truncation of title-bar string? 17 - have minimum window width: oh well 18 19 --------------------------------------------------------------------------- 20 21 Changelog: 22 - 1.01: initial public release 23 - 1.02: fixed cut-and-paste error in usage screen (oops...) 24 - 1.03: modified to allow abbreviated options 25 - 1.04: removed bogus extra argument from usage fprintf() [Glenn R-P?]; 26 fixed command-line parsing bug 27 - 1.10: enabled "message window"/console (thanks to David Geldreich) 28 - 1.20: added runtime MMX-enabling/disabling and new -mmx* options 29 - 1.21: made minor tweak to usage screen to fit within 25-line console 30 - 1.22: added AMD64/EM64T support (__x86_64__) 31 - 2.00: dual-licensed (added GNU GPL) 32 - 2.01: fixed 64-bit typo in readpng2.c 33 - 2.02: fixed improper display of usage screen on PNG error(s); fixed 34 unexpected-EOF and file-read-error cases 35 36 --------------------------------------------------------------------------- 37 38 Copyright (c) 1998-2008 Greg Roelofs. All rights reserved. 39 40 This software is provided "as is," without warranty of any kind, 41 express or implied. In no event shall the author or contributors 42 be held liable for any damages arising in any way from the use of 43 this software. 44 45 The contents of this file are DUAL-LICENSED. You may modify and/or 46 redistribute this software according to the terms of one of the 47 following two licenses (at your option): 48 49 50 LICENSE 1 ("BSD-like with advertising clause"): 51 52 Permission is granted to anyone to use this software for any purpose, 53 including commercial applications, and to alter it and redistribute 54 it freely, subject to the following restrictions: 55 56 1. Redistributions of source code must retain the above copyright 57 notice, disclaimer, and this list of conditions. 58 2. Redistributions in binary form must reproduce the above copyright 59 notice, disclaimer, and this list of conditions in the documenta- 60 tion and/or other materials provided with the distribution. 61 3. All advertising materials mentioning features or use of this 62 software must display the following acknowledgment: 63 64 This product includes software developed by Greg Roelofs 65 and contributors for the book, "PNG: The Definitive Guide," 66 published by O'Reilly and Associates. 67 68 69 LICENSE 2 (GNU GPL v2 or later): 70 71 This program is free software; you can redistribute it and/or modify 72 it under the terms of the GNU General Public License as published by 73 the Free Software Foundation; either version 2 of the License, or 74 (at your option) any later version. 75 76 This program is distributed in the hope that it will be useful, 77 but WITHOUT ANY WARRANTY; without even the implied warranty of 78 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 79 GNU General Public License for more details. 80 81 You should have received a copy of the GNU General Public License 82 along with this program; if not, write to the Free Software Foundation, 83 Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 84 85 ---------------------------------------------------------------------------*/ 86 87#define PROGNAME "rpng2-win" 88#define LONGNAME "Progressive PNG Viewer for Windows" 89#define VERSION "2.02 of 16 March 2008" 90 91#include <stdio.h> 92#include <stdlib.h> 93#include <string.h> 94#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */ 95#include <time.h> 96#include <math.h> /* only for PvdM background code */ 97#include <windows.h> 98#include <conio.h> /* only for _getch() */ 99 100/* all for PvdM background code: */ 101#ifndef PI 102# define PI 3.141592653589793238 103#endif 104#define PI_2 (PI*0.5) 105#define INV_PI_360 (360.0 / PI) 106#define MAX(a,b) (a>b?a:b) 107#define MIN(a,b) (a<b?a:b) 108#define CLIP(a,min,max) MAX(min,MIN((a),max)) 109#define ABS(a) ((a)<0?-(a):(a)) 110#define CLIP8P(c) MAX(0,(MIN((c),255))) /* 8-bit pos. integer (uch) */ 111#define ROUNDF(f) ((int)(f + 0.5)) 112 113#define rgb1_max bg_freq 114#define rgb1_min bg_gray 115#define rgb2_max bg_bsat 116#define rgb2_min bg_brot 117 118/* #define DEBUG */ /* this enables the Trace() macros */ 119 120#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */ 121 122 123/* could just include png.h, but this macro is the only thing we need 124 * (name and typedefs changed to local versions); note that side effects 125 * only happen with alpha (which could easily be avoided with 126 * "ush acopy = (alpha);") */ 127 128#define alpha_composite(composite, fg, alpha, bg) { \ 129 ush temp = ((ush)(fg)*(ush)(alpha) + \ 130 (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \ 131 (composite) = (uch)((temp + (temp >> 8)) >> 8); \ 132} 133 134 135#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this 136 * block size corresponds roughly to a download 137 * speed 10% faster than theoretical 33.6K maximum 138 * (assuming 8 data bits, 1 stop bit and no other 139 * overhead) */ 140 141/* local prototypes */ 142static void rpng2_win_init(void); 143static int rpng2_win_create_window(void); 144static int rpng2_win_load_bg_image(void); 145static void rpng2_win_display_row(ulg row); 146static void rpng2_win_finish_display(void); 147static void rpng2_win_cleanup(void); 148LRESULT CALLBACK rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM); 149 150 151static char titlebar[1024]; 152static char *progname = PROGNAME; 153static char *appname = LONGNAME; 154static char *filename; 155static FILE *infile; 156 157static mainprog_info rpng2_info; 158 159static uch inbuf[INBUFSIZE]; 160static int incount; 161 162static int pat = 6; /* must be less than num_bgpat */ 163static int bg_image = 0; 164static int bgscale = 16; 165static ulg bg_rowbytes; 166static uch *bg_data; 167 168static struct rgb_color { 169 uch r, g, b; 170} rgb[] = { 171 { 0, 0, 0}, /* 0: black */ 172 {255, 255, 255}, /* 1: white */ 173 {173, 132, 57}, /* 2: tan */ 174 { 64, 132, 0}, /* 3: medium green */ 175 {189, 117, 1}, /* 4: gold */ 176 {253, 249, 1}, /* 5: yellow */ 177 { 0, 0, 255}, /* 6: blue */ 178 { 0, 0, 120}, /* 7: medium blue */ 179 {255, 0, 255}, /* 8: magenta */ 180 { 64, 0, 64}, /* 9: dark magenta */ 181 {255, 0, 0}, /* 10: red */ 182 { 64, 0, 0}, /* 11: dark red */ 183 {255, 127, 0}, /* 12: orange */ 184 {192, 96, 0}, /* 13: darker orange */ 185 { 24, 60, 0}, /* 14: dark green-yellow */ 186 { 85, 125, 200} /* 15: ice blue */ 187}; 188/* not used for now, but should be for error-checking: 189static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color); 190 */ 191 192/* 193 This whole struct is a fairly cheesy way to keep the number of 194 command-line options to a minimum. The radial-waves background 195 type is a particularly poor fit to the integer elements of the 196 struct...but a few macros and a little fixed-point math will do 197 wonders for ya. 198 199 type bits: 200 F E D C B A 9 8 7 6 5 4 3 2 1 0 201 | | | | | 202 | | +-+-+-- 0 = sharp-edged checkerboard 203 | | 1 = soft diamonds 204 | | 2 = radial waves 205 | | 3-7 = undefined 206 | +-- gradient #2 inverted? 207 +-- alternating columns inverted? 208 */ 209static struct background_pattern { 210 ush type; 211 int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */ 212 int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/ 213} bg[] = { 214 {0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */ 215 {0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */ 216 {0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */ 217 {0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */ 218 {0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */ 219 {0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */ 220 {0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */ 221 {1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */ 222 {1, 12,0, 11,0}, /* diamonds: orange vs. dark red */ 223 {1, 10,0, 7,0}, /* diamonds: red vs. medium blue */ 224 {1, 4,0, 5,0}, /* diamonds: gold vs. yellow */ 225 {1, 3,0, 0,0}, /* diamonds: medium green vs. black */ 226 {2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */ 227 {2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */ 228 {2, 16, 256, 100, 250}, /* radial: very tight spiral */ 229 {2, 10000, 256, 11, 0} /* radial: dipole-moire' (almost fractal) */ 230}; 231static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern); 232 233 234/* Windows-specific global variables (could go in struct, but messy...) */ 235static ulg wimage_rowbytes; 236static uch *dib; 237static uch *wimage_data; 238static BITMAPINFOHEADER *bmih; 239 240static HWND global_hwnd; 241static HINSTANCE global_hInst; 242static int global_showmode; 243 244 245 246 247int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode) 248{ 249 char *args[1024]; /* arbitrary limit, but should suffice */ 250 char **argv = args; 251 char *p, *q, *bgstr = NULL; 252 int argc = 0; 253 int rc, alen, flen; 254 int error = 0; 255 int timing = FALSE; 256 int have_bg = FALSE; 257 double LUT_exponent; /* just the lookup table */ 258 double CRT_exponent = 2.2; /* just the monitor */ 259 double default_display_exponent; /* whole display system */ 260 MSG msg; 261 262 263 /* First initialize a few things, just to be sure--memset takes care of 264 * default background color (black), booleans (FALSE), pointers (NULL), 265 * etc. */ 266 267 global_hInst = hInst; 268 global_showmode = showmode; 269 filename = (char *)NULL; 270 memset(&rpng2_info, 0, sizeof(mainprog_info)); 271 272 273 /* Next reenable console output, which normally goes to the bit bucket 274 * for windowed apps. Closing the console window will terminate the 275 * app. Thanks to David.Geldreich@realviz.com for supplying the magical 276 * incantation. */ 277 278 AllocConsole(); 279 freopen("CONOUT$", "a", stderr); 280 freopen("CONOUT$", "a", stdout); 281 282 283 /* Set the default value for our display-system exponent, i.e., the 284 * product of the CRT exponent and the exponent corresponding to 285 * the frame-buffer's lookup table (LUT), if any. This is not an 286 * exhaustive list of LUT values (e.g., OpenStep has a lot of weird 287 * ones), but it should cover 99% of the current possibilities. And 288 * yes, these ifdefs are completely wasted in a Windows program... */ 289 290#if defined(NeXT) 291 /* third-party utilities can modify the default LUT exponent */ 292 LUT_exponent = 1.0 / 2.2; 293 /* 294 if (some_next_function_that_returns_gamma(&next_gamma)) 295 LUT_exponent = 1.0 / next_gamma; 296 */ 297#elif defined(sgi) 298 LUT_exponent = 1.0 / 1.7; 299 /* there doesn't seem to be any documented function to 300 * get the "gamma" value, so we do it the hard way */ 301 infile = fopen("/etc/config/system.glGammaVal", "r"); 302 if (infile) { 303 double sgi_gamma; 304 305 fgets(tmpline, 80, infile); 306 fclose(infile); 307 sgi_gamma = atof(tmpline); 308 if (sgi_gamma > 0.0) 309 LUT_exponent = 1.0 / sgi_gamma; 310 } 311#elif defined(Macintosh) 312 LUT_exponent = 1.8 / 2.61; 313 /* 314 if (some_mac_function_that_returns_gamma(&mac_gamma)) 315 LUT_exponent = mac_gamma / 2.61; 316 */ 317#else 318 LUT_exponent = 1.0; /* assume no LUT: most PCs */ 319#endif 320 321 /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */ 322 default_display_exponent = LUT_exponent * CRT_exponent; 323 324 325 /* If the user has set the SCREEN_GAMMA environment variable as suggested 326 * (somewhat imprecisely) in the libpng documentation, use that; otherwise 327 * use the default value we just calculated. Either way, the user may 328 * override this via a command-line option. */ 329 330 if ((p = getenv("SCREEN_GAMMA")) != NULL) 331 rpng2_info.display_exponent = atof(p); 332 else 333 rpng2_info.display_exponent = default_display_exponent; 334 335 336 /* Windows really hates command lines, so we have to set up our own argv. 337 * Note that we do NOT bother with quoted arguments here, so don't use 338 * filenames with spaces in 'em! */ 339 340 argv[argc++] = PROGNAME; 341 p = cmd; 342 for (;;) { 343 if (*p == ' ') 344 while (*++p == ' ') 345 ; 346 /* now p points at the first non-space after some spaces */ 347 if (*p == '\0') 348 break; /* nothing after the spaces: done */ 349 argv[argc++] = q = p; 350 while (*q && *q != ' ') 351 ++q; 352 /* now q points at a space or the end of the string */ 353 if (*q == '\0') 354 break; /* last argv already terminated; quit */ 355 *q = '\0'; /* change space to terminator */ 356 p = q + 1; 357 } 358 argv[argc] = NULL; /* terminate the argv array itself */ 359 360 361 /* Now parse the command line for options and the PNG filename. */ 362 363 while (*++argv && !error) { 364 if (!strncmp(*argv, "-gamma", 2)) { 365 if (!*++argv) 366 ++error; 367 else { 368 rpng2_info.display_exponent = atof(*argv); 369 if (rpng2_info.display_exponent <= 0.0) 370 ++error; 371 } 372 } else if (!strncmp(*argv, "-bgcolor", 4)) { 373 if (!*++argv) 374 ++error; 375 else { 376 bgstr = *argv; 377 if (strlen(bgstr) != 7 || bgstr[0] != '#') 378 ++error; 379 else { 380 have_bg = TRUE; 381 bg_image = FALSE; 382 } 383 } 384 } else if (!strncmp(*argv, "-bgpat", 4)) { 385 if (!*++argv) 386 ++error; 387 else { 388 pat = atoi(*argv) - 1; 389 if (pat < 0 || pat >= num_bgpat) 390 ++error; 391 else { 392 bg_image = TRUE; 393 have_bg = FALSE; 394 } 395 } 396 } else if (!strncmp(*argv, "-timing", 2)) { 397 timing = TRUE; 398#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) 399 } else if (!strncmp(*argv, "-nommxfilters", 7)) { 400 rpng2_info.nommxfilters = TRUE; 401 } else if (!strncmp(*argv, "-nommxcombine", 7)) { 402 rpng2_info.nommxcombine = TRUE; 403 } else if (!strncmp(*argv, "-nommxinterlace", 7)) { 404 rpng2_info.nommxinterlace = TRUE; 405 } else if (!strcmp(*argv, "-nommx")) { 406 rpng2_info.nommxfilters = TRUE; 407 rpng2_info.nommxcombine = TRUE; 408 rpng2_info.nommxinterlace = TRUE; 409#endif 410 } else { 411 if (**argv != '-') { 412 filename = *argv; 413 if (argv[1]) /* shouldn't be any more args after filename */ 414 ++error; 415 } else 416 ++error; /* not expecting any other options */ 417 } 418 } 419 420 if (!filename) 421 ++error; 422 423 424 /* print usage screen if any errors up to this point */ 425 426 if (error) { 427 int ch; 428 429 fprintf(stderr, "\n%s %s: %s\n\n", PROGNAME, VERSION, appname); 430 readpng2_version_info(); 431 fprintf(stderr, "\n" 432 "Usage: %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n" 433#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) 434 " %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n" 435#endif 436 " %*s file.png\n\n" 437 " exp \ttransfer-function exponent (``gamma'') of the display\n" 438 "\t\t system in floating-point format (e.g., ``%.1f''); equal\n" 439 "\t\t to the product of the lookup-table exponent (varies)\n" 440 "\t\t and the CRT exponent (usually 2.2); must be positive\n" 441 " bg \tdesired background color in 7-character hex RGB format\n" 442 "\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n" 443 "\t\t used with transparent images; overrides -bgpat option\n" 444 " pat \tdesired background pattern number (1-%d); used with\n" 445 "\t\t transparent images; overrides -bgcolor option\n" 446 " -timing\tenables delay for every block read, to simulate modem\n" 447 "\t\t download of image (~36 Kbps)\n" 448#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) 449 " -nommx*\tdisable optimized MMX routines for decoding row filters,\n" 450 "\t\t combining rows, and expanding interlacing, respectively\n" 451#endif 452 "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n" 453 "Press Q or Esc to quit this usage screen. ", 454 PROGNAME, 455#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) 456 (int)strlen(PROGNAME), " ", 457#endif 458 (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat); 459 fflush(stderr); 460 do 461 ch = _getch(); 462 while (ch != 'q' && ch != 'Q' && ch != 0x1B); 463 exit(1); 464 } 465 466 467 if (!(infile = fopen(filename, "rb"))) { 468 fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename); 469 ++error; 470 } else { 471 incount = fread(inbuf, 1, INBUFSIZE, infile); 472 if (incount < 8 || !readpng2_check_sig(inbuf, 8)) { 473 fprintf(stderr, PROGNAME 474 ": [%s] is not a PNG file: incorrect signature\n", 475 filename); 476 ++error; 477 } else if ((rc = readpng2_init(&rpng2_info)) != 0) { 478 switch (rc) { 479 case 2: 480 fprintf(stderr, PROGNAME 481 ": [%s] has bad IHDR (libpng longjmp)\n", filename); 482 break; 483 case 4: 484 fprintf(stderr, PROGNAME ": insufficient memory\n"); 485 break; 486 default: 487 fprintf(stderr, PROGNAME 488 ": unknown readpng2_init() error\n"); 489 break; 490 } 491 ++error; 492 } 493 if (error) 494 fclose(infile); 495 } 496 497 498 if (error) { 499 int ch; 500 501 fprintf(stderr, PROGNAME ": aborting.\n"); 502 do 503 ch = _getch(); 504 while (ch != 'q' && ch != 'Q' && ch != 0x1B); 505 exit(2); 506 } else { 507 fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname); 508 fprintf(stderr, 509 "\n [console window: closing this window will terminate %s]\n\n", 510 PROGNAME); 511 fflush(stderr); 512 } 513 514 515 /* set the title-bar string, but make sure buffer doesn't overflow */ 516 517 alen = strlen(appname); 518 flen = strlen(filename); 519 if (alen + flen + 3 > 1023) 520 sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023)); 521 else 522 sprintf(titlebar, "%s: %s", appname, filename); 523 524 525 /* set some final rpng2_info variables before entering main data loop */ 526 527 if (have_bg) { 528 unsigned r, g, b; /* this approach quiets compiler warnings */ 529 530 sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b); 531 rpng2_info.bg_red = (uch)r; 532 rpng2_info.bg_green = (uch)g; 533 rpng2_info.bg_blue = (uch)b; 534 } else 535 rpng2_info.need_bgcolor = TRUE; 536 537 rpng2_info.state = kPreInit; 538 rpng2_info.mainprog_init = rpng2_win_init; 539 rpng2_info.mainprog_display_row = rpng2_win_display_row; 540 rpng2_info.mainprog_finish_display = rpng2_win_finish_display; 541 542 543 /* OK, this is the fun part: call readpng2_decode_data() at the start of 544 * the loop to deal with our first buffer of data (read in above to verify 545 * that the file is a PNG image), then loop through the file and continue 546 * calling the same routine to handle each chunk of data. It in turn 547 * passes the data to libpng, which will invoke one or more of our call- 548 * backs as decoded data become available. We optionally call Sleep() for 549 * one second per iteration to simulate downloading the image via an analog 550 * modem. */ 551 552 for (;;) { 553 Trace((stderr, "about to call readpng2_decode_data()\n")) 554 if (readpng2_decode_data(&rpng2_info, inbuf, incount)) 555 ++error; 556 Trace((stderr, "done with readpng2_decode_data()\n")) 557 558 if (error || incount != INBUFSIZE || rpng2_info.state == kDone) { 559 if (rpng2_info.state == kDone) { 560 Trace((stderr, "done decoding PNG image\n")) 561 } else if (ferror(infile)) { 562 fprintf(stderr, PROGNAME 563 ": error while reading PNG image file\n"); 564 exit(3); 565 } else if (feof(infile)) { 566 fprintf(stderr, PROGNAME ": end of file reached " 567 "(unexpectedly) while reading PNG image file\n"); 568 exit(3); 569 } else /* if (error) */ { 570 // will print error message below 571 } 572 break; 573 } 574 575 if (timing) 576 Sleep(1000L); 577 578 incount = fread(inbuf, 1, INBUFSIZE, infile); 579 } 580 581 582 /* clean up PNG stuff and report any decoding errors */ 583 584 fclose(infile); 585 Trace((stderr, "about to call readpng2_cleanup()\n")) 586 readpng2_cleanup(&rpng2_info); 587 588 if (error) { 589 fprintf(stderr, PROGNAME ": libpng error while decoding PNG image\n"); 590 exit(3); 591 } 592 593 594 /* wait for the user to tell us when to quit */ 595 596 while (GetMessage(&msg, NULL, 0, 0)) { 597 TranslateMessage(&msg); 598 DispatchMessage(&msg); 599 } 600 601 602 /* we're done: clean up all image and Windows resources and go away */ 603 604 Trace((stderr, "about to call rpng2_win_cleanup()\n")) 605 rpng2_win_cleanup(); 606 607 return msg.wParam; 608} 609 610 611 612 613 614/* this function is called by readpng2_info_callback() in readpng2.c, which 615 * in turn is called by libpng after all of the pre-IDAT chunks have been 616 * read and processed--i.e., we now have enough info to finish initializing */ 617 618static void rpng2_win_init() 619{ 620 ulg i; 621 ulg rowbytes = rpng2_info.rowbytes; 622 623 Trace((stderr, "beginning rpng2_win_init()\n")) 624 Trace((stderr, " rowbytes = %d\n", rpng2_info.rowbytes)) 625 Trace((stderr, " width = %ld\n", rpng2_info.width)) 626 Trace((stderr, " height = %ld\n", rpng2_info.height)) 627 628 rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height); 629 if (!rpng2_info.image_data) { 630 readpng2_cleanup(&rpng2_info); 631 return; 632 } 633 634 rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *)); 635 if (!rpng2_info.row_pointers) { 636 free(rpng2_info.image_data); 637 rpng2_info.image_data = NULL; 638 readpng2_cleanup(&rpng2_info); 639 return; 640 } 641 642 for (i = 0; i < rpng2_info.height; ++i) 643 rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes; 644 645/*--------------------------------------------------------------------------- 646 Do the basic Windows initialization stuff, make the window, and fill it 647 with the user-specified, file-specified or default background color. 648 ---------------------------------------------------------------------------*/ 649 650 if (rpng2_win_create_window()) { 651 readpng2_cleanup(&rpng2_info); 652 return; 653 } 654 655 rpng2_info.state = kWindowInit; 656} 657 658 659 660 661 662static int rpng2_win_create_window() 663{ 664 uch bg_red = rpng2_info.bg_red; 665 uch bg_green = rpng2_info.bg_green; 666 uch bg_blue = rpng2_info.bg_blue; 667 uch *dest; 668 int extra_width, extra_height; 669 ulg i, j; 670 WNDCLASSEX wndclass; 671 RECT rect; 672 673 674/*--------------------------------------------------------------------------- 675 Allocate memory for the display-specific version of the image (round up 676 to multiple of 4 for Windows DIB). 677 ---------------------------------------------------------------------------*/ 678 679 wimage_rowbytes = ((3*rpng2_info.width + 3L) >> 2) << 2; 680 681 if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) + 682 wimage_rowbytes*rpng2_info.height))) 683 { 684 return 4; /* fail */ 685 } 686 687/*--------------------------------------------------------------------------- 688 Initialize the DIB. Negative height means to use top-down BMP ordering 689 (must be uncompressed, but that's what we want). Bit count of 1, 4 or 8 690 implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values 691 directly => wimage_data begins immediately after BMP header. 692 ---------------------------------------------------------------------------*/ 693 694 memset(dib, 0, sizeof(BITMAPINFOHEADER)); 695 bmih = (BITMAPINFOHEADER *)dib; 696 bmih->biSize = sizeof(BITMAPINFOHEADER); 697 bmih->biWidth = rpng2_info.width; 698 bmih->biHeight = -((long)rpng2_info.height); 699 bmih->biPlanes = 1; 700 bmih->biBitCount = 24; 701 bmih->biCompression = 0; 702 wimage_data = dib + sizeof(BITMAPINFOHEADER); 703 704/*--------------------------------------------------------------------------- 705 Fill window with the specified background color (default is black), but 706 defer loading faked "background image" until window is displayed (may be 707 slow to compute). Data are in BGR order. 708 ---------------------------------------------------------------------------*/ 709 710 if (bg_image) { /* just fill with black for now */ 711 memset(wimage_data, 0, wimage_rowbytes*rpng2_info.height); 712 } else { 713 for (j = 0; j < rpng2_info.height; ++j) { 714 dest = wimage_data + j*wimage_rowbytes; 715 for (i = rpng2_info.width; i > 0; --i) { 716 *dest++ = bg_blue; 717 *dest++ = bg_green; 718 *dest++ = bg_red; 719 } 720 } 721 } 722 723/*--------------------------------------------------------------------------- 724 Set the window parameters. 725 ---------------------------------------------------------------------------*/ 726 727 memset(&wndclass, 0, sizeof(wndclass)); 728 729 wndclass.cbSize = sizeof(wndclass); 730 wndclass.style = CS_HREDRAW | CS_VREDRAW; 731 wndclass.lpfnWndProc = rpng2_win_wndproc; 732 wndclass.hInstance = global_hInst; 733 wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); 734 wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); 735 wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH); 736 wndclass.lpszMenuName = NULL; 737 wndclass.lpszClassName = progname; 738 wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION); 739 740 RegisterClassEx(&wndclass); 741 742/*--------------------------------------------------------------------------- 743 Finally, create the window. 744 ---------------------------------------------------------------------------*/ 745 746 extra_width = 2*(GetSystemMetrics(SM_CXBORDER) + 747 GetSystemMetrics(SM_CXDLGFRAME)); 748 extra_height = 2*(GetSystemMetrics(SM_CYBORDER) + 749 GetSystemMetrics(SM_CYDLGFRAME)) + 750 GetSystemMetrics(SM_CYCAPTION); 751 752 global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW, 753 CW_USEDEFAULT, CW_USEDEFAULT, rpng2_info.width+extra_width, 754 rpng2_info.height+extra_height, NULL, NULL, global_hInst, NULL); 755 756 ShowWindow(global_hwnd, global_showmode); 757 UpdateWindow(global_hwnd); 758 759/*--------------------------------------------------------------------------- 760 Now compute the background image and display it. If it fails (memory 761 allocation), revert to a plain background color. 762 ---------------------------------------------------------------------------*/ 763 764 if (bg_image) { 765 static const char *msg = "Computing background image..."; 766 int x, y, len = strlen(msg); 767 HDC hdc = GetDC(global_hwnd); 768 TEXTMETRIC tm; 769 770 GetTextMetrics(hdc, &tm); 771 x = (rpng2_info.width - len*tm.tmAveCharWidth)/2; 772 y = (rpng2_info.height - tm.tmHeight)/2; 773 SetBkMode(hdc, TRANSPARENT); 774 SetTextColor(hdc, GetSysColor(COLOR_HIGHLIGHTTEXT)); 775 /* this can still begin out of bounds even if x is positive (???): */ 776 TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len); 777 ReleaseDC(global_hwnd, hdc); 778 779 rpng2_win_load_bg_image(); /* resets bg_image if fails */ 780 } 781 782 if (!bg_image) { 783 for (j = 0; j < rpng2_info.height; ++j) { 784 dest = wimage_data + j*wimage_rowbytes; 785 for (i = rpng2_info.width; i > 0; --i) { 786 *dest++ = bg_blue; 787 *dest++ = bg_green; 788 *dest++ = bg_red; 789 } 790 } 791 } 792 793 rect.left = 0L; 794 rect.top = 0L; 795 rect.right = (LONG)rpng2_info.width; /* possibly off by one? */ 796 rect.bottom = (LONG)rpng2_info.height; /* possibly off by one? */ 797 InvalidateRect(global_hwnd, &rect, FALSE); 798 UpdateWindow(global_hwnd); /* similar to XFlush() */ 799 800 return 0; 801 802} /* end function rpng2_win_create_window() */ 803 804 805 806 807 808static int rpng2_win_load_bg_image() 809{ 810 uch *src, *dest; 811 uch r1, r2, g1, g2, b1, b2; 812 uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv; 813 int k, hmax, max; 814 int xidx, yidx, yidx_max = (bgscale-1); 815 int even_odd_vert, even_odd_horiz, even_odd; 816 int invert_gradient2 = (bg[pat].type & 0x08); 817 int invert_column; 818 ulg i, row; 819 820/*--------------------------------------------------------------------------- 821 Allocate buffer for fake background image to be used with transparent 822 images; if this fails, revert to plain background color. 823 ---------------------------------------------------------------------------*/ 824 825 bg_rowbytes = 3 * rpng2_info.width; 826 bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height); 827 if (!bg_data) { 828 fprintf(stderr, PROGNAME 829 ": unable to allocate memory for background image\n"); 830 bg_image = 0; 831 return 1; 832 } 833 834/*--------------------------------------------------------------------------- 835 Vertical gradients (ramps) in NxN squares, alternating direction and 836 colors (N == bgscale). 837 ---------------------------------------------------------------------------*/ 838 839 if ((bg[pat].type & 0x07) == 0) { 840 uch r1_min = rgb[bg[pat].rgb1_min].r; 841 uch g1_min = rgb[bg[pat].rgb1_min].g; 842 uch b1_min = rgb[bg[pat].rgb1_min].b; 843 uch r2_min = rgb[bg[pat].rgb2_min].r; 844 uch g2_min = rgb[bg[pat].rgb2_min].g; 845 uch b2_min = rgb[bg[pat].rgb2_min].b; 846 int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min; 847 int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min; 848 int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min; 849 int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min; 850 int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min; 851 int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min; 852 853 for (row = 0; row < rpng2_info.height; ++row) { 854 yidx = row % bgscale; 855 even_odd_vert = (row / bgscale) & 1; 856 857 r1 = r1_min + (r1_diff * yidx) / yidx_max; 858 g1 = g1_min + (g1_diff * yidx) / yidx_max; 859 b1 = b1_min + (b1_diff * yidx) / yidx_max; 860 r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max; 861 g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max; 862 b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max; 863 864 r2 = r2_min + (r2_diff * yidx) / yidx_max; 865 g2 = g2_min + (g2_diff * yidx) / yidx_max; 866 b2 = b2_min + (b2_diff * yidx) / yidx_max; 867 r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max; 868 g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max; 869 b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max; 870 871 dest = bg_data + row*bg_rowbytes; 872 for (i = 0; i < rpng2_info.width; ++i) { 873 even_odd_horiz = (i / bgscale) & 1; 874 even_odd = even_odd_vert ^ even_odd_horiz; 875 invert_column = 876 (even_odd_horiz && (bg[pat].type & 0x10)); 877 if (even_odd == 0) { /* gradient #1 */ 878 if (invert_column) { 879 *dest++ = r1_inv; 880 *dest++ = g1_inv; 881 *dest++ = b1_inv; 882 } else { 883 *dest++ = r1; 884 *dest++ = g1; 885 *dest++ = b1; 886 } 887 } else { /* gradient #2 */ 888 if ((invert_column && invert_gradient2) || 889 (!invert_column && !invert_gradient2)) 890 { 891 *dest++ = r2; /* not inverted or */ 892 *dest++ = g2; /* doubly inverted */ 893 *dest++ = b2; 894 } else { 895 *dest++ = r2_inv; 896 *dest++ = g2_inv; /* singly inverted */ 897 *dest++ = b2_inv; 898 } 899 } 900 } 901 } 902 903/*--------------------------------------------------------------------------- 904 Soft gradient-diamonds with scale = bgscale. Code contributed by Adam 905 M. Costello. 906 ---------------------------------------------------------------------------*/ 907 908 } else if ((bg[pat].type & 0x07) == 1) { 909 910 hmax = (bgscale-1)/2; /* half the max weight of a color */ 911 max = 2*hmax; /* the max weight of a color */ 912 913 r1 = rgb[bg[pat].rgb1_max].r; 914 g1 = rgb[bg[pat].rgb1_max].g; 915 b1 = rgb[bg[pat].rgb1_max].b; 916 r2 = rgb[bg[pat].rgb2_max].r; 917 g2 = rgb[bg[pat].rgb2_max].g; 918 b2 = rgb[bg[pat].rgb2_max].b; 919 920 for (row = 0; row < rpng2_info.height; ++row) { 921 yidx = row % bgscale; 922 if (yidx > hmax) 923 yidx = bgscale-1 - yidx; 924 dest = bg_data + row*bg_rowbytes; 925 for (i = 0; i < rpng2_info.width; ++i) { 926 xidx = i % bgscale; 927 if (xidx > hmax) 928 xidx = bgscale-1 - xidx; 929 k = xidx + yidx; 930 *dest++ = (k*r1 + (max-k)*r2) / max; 931 *dest++ = (k*g1 + (max-k)*g2) / max; 932 *dest++ = (k*b1 + (max-k)*b2) / max; 933 } 934 } 935 936/*--------------------------------------------------------------------------- 937 Radial "starburst" with azimuthal sinusoids; [eventually number of sinu- 938 soids will equal bgscale?]. This one is slow but very cool. Code con- 939 tributed by Pieter S. van der Meulen (originally in Smalltalk). 940 ---------------------------------------------------------------------------*/ 941 942 } else if ((bg[pat].type & 0x07) == 2) { 943 uch ch; 944 int ii, x, y, hw, hh, grayspot; 945 double freq, rotate, saturate, gray, intensity; 946 double angle=0.0, aoffset=0.0, maxDist, dist; 947 double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t; 948 949 fprintf(stderr, "%s: computing radial background...", 950 PROGNAME); 951 fflush(stderr); 952 953 hh = rpng2_info.height / 2; 954 hw = rpng2_info.width / 2; 955 956 /* variables for radial waves: 957 * aoffset: number of degrees to rotate hue [CURRENTLY NOT USED] 958 * freq: number of color beams originating from the center 959 * grayspot: size of the graying center area (anti-alias) 960 * rotate: rotation of the beams as a function of radius 961 * saturate: saturation of beams' shape azimuthally 962 */ 963 angle = CLIP(angle, 0.0, 360.0); 964 grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw)); 965 freq = MAX((double)bg[pat].bg_freq, 0.0); 966 saturate = (double)bg[pat].bg_bsat * 0.1; 967 rotate = (double)bg[pat].bg_brot * 0.1; 968 gray = 0.0; 969 intensity = 0.0; 970 maxDist = (double)((hw*hw) + (hh*hh)); 971 972 for (row = 0; row < rpng2_info.height; ++row) { 973 y = row - hh; 974 dest = bg_data + row*bg_rowbytes; 975 for (i = 0; i < rpng2_info.width; ++i) { 976 x = i - hw; 977 angle = (x == 0)? PI_2 : atan((double)y / (double)x); 978 gray = (double)MAX(ABS(y), ABS(x)) / grayspot; 979 gray = MIN(1.0, gray); 980 dist = (double)((x*x) + (y*y)) / maxDist; 981 intensity = cos((angle+(rotate*dist*PI)) * freq) * 982 gray * saturate; 983 intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5; 984 hue = (angle + PI) * INV_PI_360 + aoffset; 985 s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh)); 986 s = MIN(MAX(s,0.0), 1.0); 987 v = MIN(MAX(intensity,0.0), 1.0); 988 989 if (s == 0.0) { 990 ch = (uch)(v * 255.0); 991 *dest++ = ch; 992 *dest++ = ch; 993 *dest++ = ch; 994 } else { 995 if ((hue < 0.0) || (hue >= 360.0)) 996 hue -= (((int)(hue / 360.0)) * 360.0); 997 hue /= 60.0; 998 ii = (int)hue; 999 f = hue - (double)ii; 1000 p = (1.0 - s) * v; 1001 q = (1.0 - (s * f)) * v; 1002 t = (1.0 - (s * (1.0 - f))) * v; 1003 if (ii == 0) { red = v; green = t; blue = p; } 1004 else if (ii == 1) { red = q; green = v; blue = p; } 1005 else if (ii == 2) { red = p; green = v; blue = t; } 1006 else if (ii == 3) { red = p; green = q; blue = v; } 1007 else if (ii == 4) { red = t; green = p; blue = v; } 1008 else if (ii == 5) { red = v; green = p; blue = q; } 1009 *dest++ = (uch)(red * 255.0); 1010 *dest++ = (uch)(green * 255.0); 1011 *dest++ = (uch)(blue * 255.0); 1012 } 1013 } 1014 } 1015 fprintf(stderr, "done.\n"); 1016 fflush(stderr); 1017 } 1018 1019/*--------------------------------------------------------------------------- 1020 Blast background image to display buffer before beginning PNG decode; 1021 calling function will handle invalidation and UpdateWindow() call. 1022 ---------------------------------------------------------------------------*/ 1023 1024 for (row = 0; row < rpng2_info.height; ++row) { 1025 src = bg_data + row*bg_rowbytes; 1026 dest = wimage_data + row*wimage_rowbytes; 1027 for (i = rpng2_info.width; i > 0; --i) { 1028 r1 = *src++; 1029 g1 = *src++; 1030 b1 = *src++; 1031 *dest++ = b1; 1032 *dest++ = g1; /* note reverse order */ 1033 *dest++ = r1; 1034 } 1035 } 1036 1037 return 0; 1038 1039} /* end function rpng2_win_load_bg_image() */ 1040 1041 1042 1043 1044 1045static void rpng2_win_display_row(ulg row) 1046{ 1047 uch bg_red = rpng2_info.bg_red; 1048 uch bg_green = rpng2_info.bg_green; 1049 uch bg_blue = rpng2_info.bg_blue; 1050 uch *src, *src2=NULL, *dest; 1051 uch r, g, b, a; 1052 ulg i; 1053 static int rows=0; 1054 static ulg firstrow; 1055 1056/*--------------------------------------------------------------------------- 1057 rows and firstrow simply track how many rows (and which ones) have not 1058 yet been displayed; alternatively, we could call InvalidateRect() for 1059 every row and not bother with the records-keeping. 1060 ---------------------------------------------------------------------------*/ 1061 1062 Trace((stderr, "beginning rpng2_win_display_row()\n")) 1063 1064 if (rows == 0) 1065 firstrow = row; /* first row not yet displayed */ 1066 1067 ++rows; /* count of rows received but not yet displayed */ 1068 1069/*--------------------------------------------------------------------------- 1070 Aside from the use of the rpng2_info struct and the lack of an outer 1071 loop (over rows), this routine is identical to rpng_win_display_image() 1072 in the non-progressive version of the program. 1073 ---------------------------------------------------------------------------*/ 1074 1075 src = rpng2_info.image_data + row*rpng2_info.rowbytes; 1076 if (bg_image) 1077 src2 = bg_data + row*bg_rowbytes; 1078 dest = wimage_data + row*wimage_rowbytes; 1079 1080 if (rpng2_info.channels == 3) { 1081 for (i = rpng2_info.width; i > 0; --i) { 1082 r = *src++; 1083 g = *src++; 1084 b = *src++; 1085 *dest++ = b; 1086 *dest++ = g; /* note reverse order */ 1087 *dest++ = r; 1088 } 1089 } else /* if (rpng2_info.channels == 4) */ { 1090 for (i = rpng2_info.width; i > 0; --i) { 1091 r = *src++; 1092 g = *src++; 1093 b = *src++; 1094 a = *src++; 1095 if (bg_image) { 1096 bg_red = *src2++; 1097 bg_green = *src2++; 1098 bg_blue = *src2++; 1099 } 1100 if (a == 255) { 1101 *dest++ = b; 1102 *dest++ = g; 1103 *dest++ = r; 1104 } else if (a == 0) { 1105 *dest++ = bg_blue; 1106 *dest++ = bg_green; 1107 *dest++ = bg_red; 1108 } else { 1109 /* this macro (copied from png.h) composites the 1110 * foreground and background values and puts the 1111 * result into the first argument; there are no 1112 * side effects with the first argument */ 1113 alpha_composite(*dest++, b, a, bg_blue); 1114 alpha_composite(*dest++, g, a, bg_green); 1115 alpha_composite(*dest++, r, a, bg_red); 1116 } 1117 } 1118 } 1119 1120/*--------------------------------------------------------------------------- 1121 Display after every 16 rows or when on last row. (Region may include 1122 previously displayed lines due to interlacing--i.e., not contiguous.) 1123 ---------------------------------------------------------------------------*/ 1124 1125 if ((rows & 0xf) == 0 || row == rpng2_info.height-1) { 1126 RECT rect; 1127 1128 rect.left = 0L; 1129 rect.top = (LONG)firstrow; 1130 rect.right = (LONG)rpng2_info.width; /* possibly off by one? */ 1131 rect.bottom = (LONG)row + 1L; /* possibly off by one? */ 1132 InvalidateRect(global_hwnd, &rect, FALSE); 1133 UpdateWindow(global_hwnd); /* similar to XFlush() */ 1134 rows = 0; 1135 } 1136 1137} /* end function rpng2_win_display_row() */ 1138 1139 1140 1141 1142 1143static void rpng2_win_finish_display() 1144{ 1145 Trace((stderr, "beginning rpng2_win_finish_display()\n")) 1146 1147 /* last row has already been displayed by rpng2_win_display_row(), so 1148 * we have nothing to do here except set a flag and let the user know 1149 * that the image is done */ 1150 1151 rpng2_info.state = kDone; 1152 printf( 1153 "Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"); 1154 fflush(stdout); 1155} 1156 1157 1158 1159 1160 1161static void rpng2_win_cleanup() 1162{ 1163 if (bg_image && bg_data) { 1164 free(bg_data); 1165 bg_data = NULL; 1166 } 1167 1168 if (rpng2_info.image_data) { 1169 free(rpng2_info.image_data); 1170 rpng2_info.image_data = NULL; 1171 } 1172 1173 if (rpng2_info.row_pointers) { 1174 free(rpng2_info.row_pointers); 1175 rpng2_info.row_pointers = NULL; 1176 } 1177 1178 if (dib) { 1179 free(dib); 1180 dib = NULL; 1181 } 1182} 1183 1184 1185 1186 1187 1188LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP) 1189{ 1190 HDC hdc; 1191 PAINTSTRUCT ps; 1192 int rc; 1193 1194 switch (iMsg) { 1195 case WM_CREATE: 1196 /* one-time processing here, if any */ 1197 return 0; 1198 1199 case WM_PAINT: 1200 hdc = BeginPaint(hwnd, &ps); 1201 rc = StretchDIBits(hdc, 0, 0, rpng2_info.width, rpng2_info.height, 1202 0, 0, rpng2_info.width, rpng2_info.height, 1203 wimage_data, (BITMAPINFO *)bmih, 1204 0, SRCCOPY); 1205 EndPaint(hwnd, &ps); 1206 return 0; 1207 1208 /* wait for the user to tell us when to quit */ 1209 case WM_CHAR: 1210 switch (wP) { /* only need one, so ignore repeat count */ 1211 case 'q': 1212 case 'Q': 1213 case 0x1B: /* Esc key */ 1214 PostQuitMessage(0); 1215 } 1216 return 0; 1217 1218 case WM_LBUTTONDOWN: /* another way of quitting */ 1219 case WM_DESTROY: 1220 PostQuitMessage(0); 1221 return 0; 1222 } 1223 1224 return DefWindowProc(hwnd, iMsg, wP, lP); 1225} 1226