1 /*---------------------------------------------------------------------------
3 rpng2 - progressive-model PNG display program rpng2-win.c
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.
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
19 ---------------------------------------------------------------------------
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 - 2.03: removed runtime MMX-enabling/disabling and obsolete -mmx* options
39 ---------------------------------------------------------------------------
41 Copyright (c) 1998-2008 Greg Roelofs. All rights reserved.
43 This software is provided "as is," without warranty of any kind,
44 express or implied. In no event shall the author or contributors
45 be held liable for any damages arising in any way from the use of
48 The contents of this file are DUAL-LICENSED. You may modify and/or
49 redistribute this software according to the terms of one of the
50 following two licenses (at your option):
53 LICENSE 1 ("BSD-like with advertising clause"):
55 Permission is granted to anyone to use this software for any purpose,
56 including commercial applications, and to alter it and redistribute
57 it freely, subject to the following restrictions:
59 1. Redistributions of source code must retain the above copyright
60 notice, disclaimer, and this list of conditions.
61 2. Redistributions in binary form must reproduce the above copyright
62 notice, disclaimer, and this list of conditions in the documenta-
63 tion and/or other materials provided with the distribution.
64 3. All advertising materials mentioning features or use of this
65 software must display the following acknowledgment:
67 This product includes software developed by Greg Roelofs
68 and contributors for the book, "PNG: The Definitive Guide,"
69 published by O'Reilly and Associates.
72 LICENSE 2 (GNU GPL v2 or later):
74 This program is free software; you can redistribute it and/or modify
75 it under the terms of the GNU General Public License as published by
76 the Free Software Foundation; either version 2 of the License, or
77 (at your option) any later version.
79 This program is distributed in the hope that it will be useful,
80 but WITHOUT ANY WARRANTY; without even the implied warranty of
81 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
82 GNU General Public License for more details.
84 You should have received a copy of the GNU General Public License
85 along with this program; if not, write to the Free Software Foundation,
86 Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
88 ---------------------------------------------------------------------------*/
90 #define PROGNAME "rpng2-win"
91 #define LONGNAME "Progressive PNG Viewer for Windows"
92 #define VERSION "2.02 of 16 March 2008"
97 #include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
99 #include <math.h> /* only for PvdM background code */
102 /* getch replacement. Turns out, we don't really need this,
103 * but leave it here if we ever enable any of the uses of
104 * _getch in the main code
108 #include <sys/ioctl.h>
109 int repl_getch( void )
112 int fd = fileno(stdin);
113 struct termio old_tty, new_tty;
115 ioctl(fd, TCGETA, &old_tty);
117 new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
118 ioctl(fd, TCSETA, &new_tty);
119 fread(&ch, 1, sizeof(ch), stdin);
120 ioctl(fd, TCSETA, &old_tty);
124 #define _getch repl_getch
126 #include <conio.h> /* only for _getch() */
129 /* all for PvdM background code: */
131 # define PI 3.141592653589793238
133 #define PI_2 (PI*0.5)
134 #define INV_PI_360 (360.0 / PI)
135 #define MAX(a,b) (a>b?a:b)
136 #define MIN(a,b) (a<b?a:b)
137 #define CLIP(a,min,max) MAX(min,MIN((a),max))
138 #define ABS(a) ((a)<0?-(a):(a))
139 #define CLIP8P(c) MAX(0,(MIN((c),255))) /* 8-bit pos. integer (uch) */
140 #define ROUNDF(f) ((int)(f + 0.5))
142 #define rgb1_max bg_freq
143 #define rgb1_min bg_gray
144 #define rgb2_max bg_bsat
145 #define rgb2_min bg_brot
147 /* #define DEBUG */ /* this enables the Trace() macros */
149 #include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
152 /* could just include png.h, but this macro is the only thing we need
153 * (name and typedefs changed to local versions); note that side effects
154 * only happen with alpha (which could easily be avoided with
155 * "ush acopy = (alpha);") */
157 #define alpha_composite(composite, fg, alpha, bg) { \
158 ush temp = ((ush)(fg)*(ush)(alpha) + \
159 (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
160 (composite) = (uch)((temp + (temp >> 8)) >> 8); \
164 #define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
165 * block size corresponds roughly to a download
166 * speed 10% faster than theoretical 33.6K maximum
167 * (assuming 8 data bits, 1 stop bit and no other
170 /* local prototypes */
171 static void rpng2_win_init(void);
172 static int rpng2_win_create_window(void);
173 static int rpng2_win_load_bg_image(void);
174 static void rpng2_win_display_row(ulg row);
175 static void rpng2_win_finish_display(void);
176 static void rpng2_win_cleanup(void);
177 LRESULT CALLBACK rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
180 static char titlebar[1024];
181 static char *progname = PROGNAME;
182 static char *appname = LONGNAME;
183 static char *filename;
186 static mainprog_info rpng2_info;
188 static uch inbuf[INBUFSIZE];
191 static int pat = 6; /* must be less than num_bgpat */
192 static int bg_image = 0;
193 static int bgscale = 16;
194 static ulg bg_rowbytes;
197 static struct rgb_color {
200 { 0, 0, 0}, /* 0: black */
201 {255, 255, 255}, /* 1: white */
202 {173, 132, 57}, /* 2: tan */
203 { 64, 132, 0}, /* 3: medium green */
204 {189, 117, 1}, /* 4: gold */
205 {253, 249, 1}, /* 5: yellow */
206 { 0, 0, 255}, /* 6: blue */
207 { 0, 0, 120}, /* 7: medium blue */
208 {255, 0, 255}, /* 8: magenta */
209 { 64, 0, 64}, /* 9: dark magenta */
210 {255, 0, 0}, /* 10: red */
211 { 64, 0, 0}, /* 11: dark red */
212 {255, 127, 0}, /* 12: orange */
213 {192, 96, 0}, /* 13: darker orange */
214 { 24, 60, 0}, /* 14: dark green-yellow */
215 { 85, 125, 200} /* 15: ice blue */
217 /* not used for now, but should be for error-checking:
218 static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
222 This whole struct is a fairly cheesy way to keep the number of
223 command-line options to a minimum. The radial-waves background
224 type is a particularly poor fit to the integer elements of the
225 struct...but a few macros and a little fixed-point math will do
229 F E D C B A 9 8 7 6 5 4 3 2 1 0
231 | | +-+-+-- 0 = sharp-edged checkerboard
232 | | 1 = soft diamonds
235 | +-- gradient #2 inverted?
236 +-- alternating columns inverted?
238 static struct background_pattern {
240 int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */
241 int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/
243 {0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */
244 {0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */
245 {0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */
246 {0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */
247 {0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */
248 {0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */
249 {0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */
250 {1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */
251 {1, 12,0, 11,0}, /* diamonds: orange vs. dark red */
252 {1, 10,0, 7,0}, /* diamonds: red vs. medium blue */
253 {1, 4,0, 5,0}, /* diamonds: gold vs. yellow */
254 {1, 3,0, 0,0}, /* diamonds: medium green vs. black */
255 {2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */
256 {2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */
257 {2, 16, 256, 100, 250}, /* radial: very tight spiral */
258 {2, 10000, 256, 11, 0} /* radial: dipole-moire' (almost fractal) */
260 static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);
263 /* Windows-specific global variables (could go in struct, but messy...) */
264 static ulg wimage_rowbytes;
266 static uch *wimage_data;
267 static BITMAPINFOHEADER *bmih;
269 static HWND global_hwnd;
270 static HINSTANCE global_hInst;
271 static int global_showmode;
276 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
278 char *args[1024]; /* arbitrary limit, but should suffice */
280 char *p, *q, *bgstr = NULL;
286 double LUT_exponent; /* just the lookup table */
287 double CRT_exponent = 2.2; /* just the monitor */
288 double default_display_exponent; /* whole display system */
292 /* First initialize a few things, just to be sure--memset takes care of
293 * default background color (black), booleans (FALSE), pointers (NULL),
296 global_hInst = hInst;
297 global_showmode = showmode;
298 filename = (char *)NULL;
299 memset(&rpng2_info, 0, sizeof(mainprog_info));
302 /* Next reenable console output, which normally goes to the bit bucket
303 * for windowed apps. Closing the console window will terminate the
304 * app. Thanks to David.Geldreich@realviz.com for supplying the magical
308 freopen("CONOUT$", "a", stderr);
309 freopen("CONOUT$", "a", stdout);
312 /* Set the default value for our display-system exponent, i.e., the
313 * product of the CRT exponent and the exponent corresponding to
314 * the frame-buffer's lookup table (LUT), if any. This is not an
315 * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
316 * ones), but it should cover 99% of the current possibilities. And
317 * yes, these ifdefs are completely wasted in a Windows program... */
320 /* third-party utilities can modify the default LUT exponent */
321 LUT_exponent = 1.0 / 2.2;
323 if (some_next_function_that_returns_gamma(&next_gamma))
324 LUT_exponent = 1.0 / next_gamma;
327 LUT_exponent = 1.0 / 1.7;
328 /* there doesn't seem to be any documented function to
329 * get the "gamma" value, so we do it the hard way */
330 infile = fopen("/etc/config/system.glGammaVal", "r");
334 fgets(tmpline, 80, infile);
336 sgi_gamma = atof(tmpline);
338 LUT_exponent = 1.0 / sgi_gamma;
340 #elif defined(Macintosh)
341 LUT_exponent = 1.8 / 2.61;
343 if (some_mac_function_that_returns_gamma(&mac_gamma))
344 LUT_exponent = mac_gamma / 2.61;
347 LUT_exponent = 1.0; /* assume no LUT: most PCs */
350 /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
351 default_display_exponent = LUT_exponent * CRT_exponent;
354 /* If the user has set the SCREEN_GAMMA environment variable as suggested
355 * (somewhat imprecisely) in the libpng documentation, use that; otherwise
356 * use the default value we just calculated. Either way, the user may
357 * override this via a command-line option. */
359 if ((p = getenv("SCREEN_GAMMA")) != NULL)
360 rpng2_info.display_exponent = atof(p);
362 rpng2_info.display_exponent = default_display_exponent;
365 /* Windows really hates command lines, so we have to set up our own argv.
366 * Note that we do NOT bother with quoted arguments here, so don't use
367 * filenames with spaces in 'em! */
369 argv[argc++] = PROGNAME;
375 /* now p points at the first non-space after some spaces */
377 break; /* nothing after the spaces: done */
378 argv[argc++] = q = p;
379 while (*q && *q != ' ')
381 /* now q points at a space or the end of the string */
383 break; /* last argv already terminated; quit */
384 *q = '\0'; /* change space to terminator */
387 argv[argc] = NULL; /* terminate the argv array itself */
390 /* Now parse the command line for options and the PNG filename. */
392 while (*++argv && !error) {
393 if (!strncmp(*argv, "-gamma", 2)) {
397 rpng2_info.display_exponent = atof(*argv);
398 if (rpng2_info.display_exponent <= 0.0)
401 } else if (!strncmp(*argv, "-bgcolor", 4)) {
406 if (strlen(bgstr) != 7 || bgstr[0] != '#')
413 } else if (!strncmp(*argv, "-bgpat", 4)) {
417 pat = atoi(*argv) - 1;
418 if (pat < 0 || pat >= num_bgpat)
425 } else if (!strncmp(*argv, "-timing", 2)) {
430 if (argv[1]) /* shouldn't be any more args after filename */
433 ++error; /* not expecting any other options */
441 /* print usage screen if any errors up to this point */
448 fprintf(stderr, "\n%s %s: %s\n\n", PROGNAME, VERSION, appname);
449 readpng2_version_info();
451 "Usage: %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
453 " exp \ttransfer-function exponent (``gamma'') of the display\n"
454 "\t\t system in floating-point format (e.g., ``%.1f''); equal\n"
455 "\t\t to the product of the lookup-table exponent (varies)\n"
456 "\t\t and the CRT exponent (usually 2.2); must be positive\n"
457 " bg \tdesired background color in 7-character hex RGB format\n"
458 "\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n"
459 "\t\t used with transparent images; overrides -bgpat option\n"
460 " pat \tdesired background pattern number (1-%d); used with\n"
461 "\t\t transparent images; overrides -bgcolor option\n"
462 " -timing\tenables delay for every block read, to simulate modem\n"
463 "\t\t download of image (~36 Kbps)\n"
464 "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
466 "Press Q or Esc to quit this usage screen. ",
471 #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
472 !(defined(__CYGWIN__) || defined(__MINGW32__))
473 (int)strlen(PROGNAME), " ",
475 (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
480 while (ch != 'q' && ch != 'Q' && ch != 0x1B);
486 if (!(infile = fopen(filename, "rb"))) {
487 fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename);
490 incount = fread(inbuf, 1, INBUFSIZE, infile);
491 if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
492 fprintf(stderr, PROGNAME
493 ": [%s] is not a PNG file: incorrect signature\n",
496 } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
499 fprintf(stderr, PROGNAME
500 ": [%s] has bad IHDR (libpng longjmp)\n", filename);
503 fprintf(stderr, PROGNAME ": insufficient memory\n");
506 fprintf(stderr, PROGNAME
507 ": unknown readpng2_init() error\n");
522 fprintf(stderr, PROGNAME ": aborting.\n");
526 while (ch != 'q' && ch != 'Q' && ch != 0x1B);
530 fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname);
533 "\n [console window: closing this window will terminate %s]\n\n",
540 /* set the title-bar string, but make sure buffer doesn't overflow */
542 alen = strlen(appname);
543 flen = strlen(filename);
544 if (alen + flen + 3 > 1023)
545 sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023));
547 sprintf(titlebar, "%s: %s", appname, filename);
550 /* set some final rpng2_info variables before entering main data loop */
553 unsigned r, g, b; /* this approach quiets compiler warnings */
555 sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
556 rpng2_info.bg_red = (uch)r;
557 rpng2_info.bg_green = (uch)g;
558 rpng2_info.bg_blue = (uch)b;
560 rpng2_info.need_bgcolor = TRUE;
562 rpng2_info.state = kPreInit;
563 rpng2_info.mainprog_init = rpng2_win_init;
564 rpng2_info.mainprog_display_row = rpng2_win_display_row;
565 rpng2_info.mainprog_finish_display = rpng2_win_finish_display;
568 /* OK, this is the fun part: call readpng2_decode_data() at the start of
569 * the loop to deal with our first buffer of data (read in above to verify
570 * that the file is a PNG image), then loop through the file and continue
571 * calling the same routine to handle each chunk of data. It in turn
572 * passes the data to libpng, which will invoke one or more of our call-
573 * backs as decoded data become available. We optionally call Sleep() for
574 * one second per iteration to simulate downloading the image via an analog
578 Trace((stderr, "about to call readpng2_decode_data()\n"))
579 if (readpng2_decode_data(&rpng2_info, inbuf, incount))
581 Trace((stderr, "done with readpng2_decode_data()\n"))
583 if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {
584 if (rpng2_info.state == kDone) {
585 Trace((stderr, "done decoding PNG image\n"))
586 } else if (ferror(infile)) {
587 fprintf(stderr, PROGNAME
588 ": error while reading PNG image file\n");
590 } else if (feof(infile)) {
591 fprintf(stderr, PROGNAME ": end of file reached "
592 "(unexpectedly) while reading PNG image file\n");
594 } else /* if (error) */ {
595 /* will print error message below */
603 incount = fread(inbuf, 1, INBUFSIZE, infile);
607 /* clean up PNG stuff and report any decoding errors */
610 Trace((stderr, "about to call readpng2_cleanup()\n"))
611 readpng2_cleanup(&rpng2_info);
614 fprintf(stderr, PROGNAME ": libpng error while decoding PNG image\n");
619 /* wait for the user to tell us when to quit */
621 while (GetMessage(&msg, NULL, 0, 0)) {
622 TranslateMessage(&msg);
623 DispatchMessage(&msg);
627 /* we're done: clean up all image and Windows resources and go away */
629 Trace((stderr, "about to call rpng2_win_cleanup()\n"))
639 /* this function is called by readpng2_info_callback() in readpng2.c, which
640 * in turn is called by libpng after all of the pre-IDAT chunks have been
641 * read and processed--i.e., we now have enough info to finish initializing */
643 static void rpng2_win_init()
646 ulg rowbytes = rpng2_info.rowbytes;
648 Trace((stderr, "beginning rpng2_win_init()\n"))
649 Trace((stderr, " rowbytes = %d\n", rpng2_info.rowbytes))
650 Trace((stderr, " width = %ld\n", rpng2_info.width))
651 Trace((stderr, " height = %ld\n", rpng2_info.height))
653 rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height);
654 if (!rpng2_info.image_data) {
655 readpng2_cleanup(&rpng2_info);
659 rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *));
660 if (!rpng2_info.row_pointers) {
661 free(rpng2_info.image_data);
662 rpng2_info.image_data = NULL;
663 readpng2_cleanup(&rpng2_info);
667 for (i = 0; i < rpng2_info.height; ++i)
668 rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes;
670 /*---------------------------------------------------------------------------
671 Do the basic Windows initialization stuff, make the window, and fill it
672 with the user-specified, file-specified or default background color.
673 ---------------------------------------------------------------------------*/
675 if (rpng2_win_create_window()) {
676 readpng2_cleanup(&rpng2_info);
680 rpng2_info.state = kWindowInit;
687 static int rpng2_win_create_window()
689 uch bg_red = rpng2_info.bg_red;
690 uch bg_green = rpng2_info.bg_green;
691 uch bg_blue = rpng2_info.bg_blue;
693 int extra_width, extra_height;
699 /*---------------------------------------------------------------------------
700 Allocate memory for the display-specific version of the image (round up
701 to multiple of 4 for Windows DIB).
702 ---------------------------------------------------------------------------*/
704 wimage_rowbytes = ((3*rpng2_info.width + 3L) >> 2) << 2;
706 if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
707 wimage_rowbytes*rpng2_info.height)))
712 /*---------------------------------------------------------------------------
713 Initialize the DIB. Negative height means to use top-down BMP ordering
714 (must be uncompressed, but that's what we want). Bit count of 1, 4 or 8
715 implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values
716 directly => wimage_data begins immediately after BMP header.
717 ---------------------------------------------------------------------------*/
719 memset(dib, 0, sizeof(BITMAPINFOHEADER));
720 bmih = (BITMAPINFOHEADER *)dib;
721 bmih->biSize = sizeof(BITMAPINFOHEADER);
722 bmih->biWidth = rpng2_info.width;
723 bmih->biHeight = -((long)rpng2_info.height);
725 bmih->biBitCount = 24;
726 bmih->biCompression = 0;
727 wimage_data = dib + sizeof(BITMAPINFOHEADER);
729 /*---------------------------------------------------------------------------
730 Fill window with the specified background color (default is black), but
731 defer loading faked "background image" until window is displayed (may be
732 slow to compute). Data are in BGR order.
733 ---------------------------------------------------------------------------*/
735 if (bg_image) { /* just fill with black for now */
736 memset(wimage_data, 0, wimage_rowbytes*rpng2_info.height);
738 for (j = 0; j < rpng2_info.height; ++j) {
739 dest = wimage_data + j*wimage_rowbytes;
740 for (i = rpng2_info.width; i > 0; --i) {
748 /*---------------------------------------------------------------------------
749 Set the window parameters.
750 ---------------------------------------------------------------------------*/
752 memset(&wndclass, 0, sizeof(wndclass));
754 wndclass.cbSize = sizeof(wndclass);
755 wndclass.style = CS_HREDRAW | CS_VREDRAW;
756 wndclass.lpfnWndProc = rpng2_win_wndproc;
757 wndclass.hInstance = global_hInst;
758 wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
759 wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
760 wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
761 wndclass.lpszMenuName = NULL;
762 wndclass.lpszClassName = progname;
763 wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
765 RegisterClassEx(&wndclass);
767 /*---------------------------------------------------------------------------
768 Finally, create the window.
769 ---------------------------------------------------------------------------*/
771 extra_width = 2*(GetSystemMetrics(SM_CXBORDER) +
772 GetSystemMetrics(SM_CXDLGFRAME));
773 extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +
774 GetSystemMetrics(SM_CYDLGFRAME)) +
775 GetSystemMetrics(SM_CYCAPTION);
777 global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,
778 CW_USEDEFAULT, CW_USEDEFAULT, rpng2_info.width+extra_width,
779 rpng2_info.height+extra_height, NULL, NULL, global_hInst, NULL);
781 ShowWindow(global_hwnd, global_showmode);
782 UpdateWindow(global_hwnd);
784 /*---------------------------------------------------------------------------
785 Now compute the background image and display it. If it fails (memory
786 allocation), revert to a plain background color.
787 ---------------------------------------------------------------------------*/
790 static const char *msg = "Computing background image...";
791 int x, y, len = strlen(msg);
792 HDC hdc = GetDC(global_hwnd);
795 GetTextMetrics(hdc, &tm);
796 x = (rpng2_info.width - len*tm.tmAveCharWidth)/2;
797 y = (rpng2_info.height - tm.tmHeight)/2;
798 SetBkMode(hdc, TRANSPARENT);
799 SetTextColor(hdc, GetSysColor(COLOR_HIGHLIGHTTEXT));
800 /* this can still begin out of bounds even if x is positive (???): */
801 TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len);
802 ReleaseDC(global_hwnd, hdc);
804 rpng2_win_load_bg_image(); /* resets bg_image if fails */
808 for (j = 0; j < rpng2_info.height; ++j) {
809 dest = wimage_data + j*wimage_rowbytes;
810 for (i = rpng2_info.width; i > 0; --i) {
820 rect.right = (LONG)rpng2_info.width; /* possibly off by one? */
821 rect.bottom = (LONG)rpng2_info.height; /* possibly off by one? */
822 InvalidateRect(global_hwnd, &rect, FALSE);
823 UpdateWindow(global_hwnd); /* similar to XFlush() */
827 } /* end function rpng2_win_create_window() */
833 static int rpng2_win_load_bg_image()
836 uch r1, r2, g1, g2, b1, b2;
837 uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;
839 int xidx, yidx, yidx_max = (bgscale-1);
840 int even_odd_vert, even_odd_horiz, even_odd;
841 int invert_gradient2 = (bg[pat].type & 0x08);
845 /*---------------------------------------------------------------------------
846 Allocate buffer for fake background image to be used with transparent
847 images; if this fails, revert to plain background color.
848 ---------------------------------------------------------------------------*/
850 bg_rowbytes = 3 * rpng2_info.width;
851 bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height);
853 fprintf(stderr, PROGNAME
854 ": unable to allocate memory for background image\n");
859 /*---------------------------------------------------------------------------
860 Vertical gradients (ramps) in NxN squares, alternating direction and
861 colors (N == bgscale).
862 ---------------------------------------------------------------------------*/
864 if ((bg[pat].type & 0x07) == 0) {
865 uch r1_min = rgb[bg[pat].rgb1_min].r;
866 uch g1_min = rgb[bg[pat].rgb1_min].g;
867 uch b1_min = rgb[bg[pat].rgb1_min].b;
868 uch r2_min = rgb[bg[pat].rgb2_min].r;
869 uch g2_min = rgb[bg[pat].rgb2_min].g;
870 uch b2_min = rgb[bg[pat].rgb2_min].b;
871 int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;
872 int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;
873 int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;
874 int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;
875 int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;
876 int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;
878 for (row = 0; row < rpng2_info.height; ++row) {
879 yidx = row % bgscale;
880 even_odd_vert = (row / bgscale) & 1;
882 r1 = r1_min + (r1_diff * yidx) / yidx_max;
883 g1 = g1_min + (g1_diff * yidx) / yidx_max;
884 b1 = b1_min + (b1_diff * yidx) / yidx_max;
885 r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;
886 g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;
887 b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;
889 r2 = r2_min + (r2_diff * yidx) / yidx_max;
890 g2 = g2_min + (g2_diff * yidx) / yidx_max;
891 b2 = b2_min + (b2_diff * yidx) / yidx_max;
892 r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;
893 g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
894 b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;
896 dest = bg_data + row*bg_rowbytes;
897 for (i = 0; i < rpng2_info.width; ++i) {
898 even_odd_horiz = (i / bgscale) & 1;
899 even_odd = even_odd_vert ^ even_odd_horiz;
901 (even_odd_horiz && (bg[pat].type & 0x10));
902 if (even_odd == 0) { /* gradient #1 */
912 } else { /* gradient #2 */
913 if ((invert_column && invert_gradient2) ||
914 (!invert_column && !invert_gradient2))
916 *dest++ = r2; /* not inverted or */
917 *dest++ = g2; /* doubly inverted */
921 *dest++ = g2_inv; /* singly inverted */
928 /*---------------------------------------------------------------------------
929 Soft gradient-diamonds with scale = bgscale. Code contributed by Adam
931 ---------------------------------------------------------------------------*/
933 } else if ((bg[pat].type & 0x07) == 1) {
935 hmax = (bgscale-1)/2; /* half the max weight of a color */
936 max = 2*hmax; /* the max weight of a color */
938 r1 = rgb[bg[pat].rgb1_max].r;
939 g1 = rgb[bg[pat].rgb1_max].g;
940 b1 = rgb[bg[pat].rgb1_max].b;
941 r2 = rgb[bg[pat].rgb2_max].r;
942 g2 = rgb[bg[pat].rgb2_max].g;
943 b2 = rgb[bg[pat].rgb2_max].b;
945 for (row = 0; row < rpng2_info.height; ++row) {
946 yidx = row % bgscale;
948 yidx = bgscale-1 - yidx;
949 dest = bg_data + row*bg_rowbytes;
950 for (i = 0; i < rpng2_info.width; ++i) {
953 xidx = bgscale-1 - xidx;
955 *dest++ = (k*r1 + (max-k)*r2) / max;
956 *dest++ = (k*g1 + (max-k)*g2) / max;
957 *dest++ = (k*b1 + (max-k)*b2) / max;
961 /*---------------------------------------------------------------------------
962 Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-
963 soids will equal bgscale?]. This one is slow but very cool. Code con-
964 tributed by Pieter S. van der Meulen (originally in Smalltalk).
965 ---------------------------------------------------------------------------*/
967 } else if ((bg[pat].type & 0x07) == 2) {
969 int ii, x, y, hw, hh, grayspot;
970 double freq, rotate, saturate, gray, intensity;
971 double angle=0.0, aoffset=0.0, maxDist, dist;
972 double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;
974 fprintf(stderr, "%s: computing radial background...",
978 hh = rpng2_info.height / 2;
979 hw = rpng2_info.width / 2;
981 /* variables for radial waves:
982 * aoffset: number of degrees to rotate hue [CURRENTLY NOT USED]
983 * freq: number of color beams originating from the center
984 * grayspot: size of the graying center area (anti-alias)
985 * rotate: rotation of the beams as a function of radius
986 * saturate: saturation of beams' shape azimuthally
988 angle = CLIP(angle, 0.0, 360.0);
989 grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));
990 freq = MAX((double)bg[pat].bg_freq, 0.0);
991 saturate = (double)bg[pat].bg_bsat * 0.1;
992 rotate = (double)bg[pat].bg_brot * 0.1;
995 maxDist = (double)((hw*hw) + (hh*hh));
997 for (row = 0; row < rpng2_info.height; ++row) {
999 dest = bg_data + row*bg_rowbytes;
1000 for (i = 0; i < rpng2_info.width; ++i) {
1002 angle = (x == 0)? PI_2 : atan((double)y / (double)x);
1003 gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
1004 gray = MIN(1.0, gray);
1005 dist = (double)((x*x) + (y*y)) / maxDist;
1006 intensity = cos((angle+(rotate*dist*PI)) * freq) *
1008 intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;
1009 hue = (angle + PI) * INV_PI_360 + aoffset;
1010 s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));
1011 s = MIN(MAX(s,0.0), 1.0);
1012 v = MIN(MAX(intensity,0.0), 1.0);
1015 ch = (uch)(v * 255.0);
1020 if ((hue < 0.0) || (hue >= 360.0))
1021 hue -= (((int)(hue / 360.0)) * 360.0);
1024 f = hue - (double)ii;
1026 q = (1.0 - (s * f)) * v;
1027 t = (1.0 - (s * (1.0 - f))) * v;
1028 if (ii == 0) { red = v; green = t; blue = p; }
1029 else if (ii == 1) { red = q; green = v; blue = p; }
1030 else if (ii == 2) { red = p; green = v; blue = t; }
1031 else if (ii == 3) { red = p; green = q; blue = v; }
1032 else if (ii == 4) { red = t; green = p; blue = v; }
1033 else if (ii == 5) { red = v; green = p; blue = q; }
1034 *dest++ = (uch)(red * 255.0);
1035 *dest++ = (uch)(green * 255.0);
1036 *dest++ = (uch)(blue * 255.0);
1040 fprintf(stderr, "done.\n");
1044 /*---------------------------------------------------------------------------
1045 Blast background image to display buffer before beginning PNG decode;
1046 calling function will handle invalidation and UpdateWindow() call.
1047 ---------------------------------------------------------------------------*/
1049 for (row = 0; row < rpng2_info.height; ++row) {
1050 src = bg_data + row*bg_rowbytes;
1051 dest = wimage_data + row*wimage_rowbytes;
1052 for (i = rpng2_info.width; i > 0; --i) {
1057 *dest++ = g1; /* note reverse order */
1064 } /* end function rpng2_win_load_bg_image() */
1070 static void rpng2_win_display_row(ulg row)
1072 uch bg_red = rpng2_info.bg_red;
1073 uch bg_green = rpng2_info.bg_green;
1074 uch bg_blue = rpng2_info.bg_blue;
1075 uch *src, *src2=NULL, *dest;
1079 static ulg firstrow;
1081 /*---------------------------------------------------------------------------
1082 rows and firstrow simply track how many rows (and which ones) have not
1083 yet been displayed; alternatively, we could call InvalidateRect() for
1084 every row and not bother with the records-keeping.
1085 ---------------------------------------------------------------------------*/
1087 Trace((stderr, "beginning rpng2_win_display_row()\n"))
1090 firstrow = row; /* first row not yet displayed */
1092 ++rows; /* count of rows received but not yet displayed */
1094 /*---------------------------------------------------------------------------
1095 Aside from the use of the rpng2_info struct and the lack of an outer
1096 loop (over rows), this routine is identical to rpng_win_display_image()
1097 in the non-progressive version of the program.
1098 ---------------------------------------------------------------------------*/
1100 src = rpng2_info.image_data + row*rpng2_info.rowbytes;
1102 src2 = bg_data + row*bg_rowbytes;
1103 dest = wimage_data + row*wimage_rowbytes;
1105 if (rpng2_info.channels == 3) {
1106 for (i = rpng2_info.width; i > 0; --i) {
1111 *dest++ = g; /* note reverse order */
1114 } else /* if (rpng2_info.channels == 4) */ {
1115 for (i = rpng2_info.width; i > 0; --i) {
1129 } else if (a == 0) {
1134 /* this macro (copied from png.h) composites the
1135 * foreground and background values and puts the
1136 * result into the first argument; there are no
1137 * side effects with the first argument */
1138 alpha_composite(*dest++, b, a, bg_blue);
1139 alpha_composite(*dest++, g, a, bg_green);
1140 alpha_composite(*dest++, r, a, bg_red);
1145 /*---------------------------------------------------------------------------
1146 Display after every 16 rows or when on last row. (Region may include
1147 previously displayed lines due to interlacing--i.e., not contiguous.)
1148 ---------------------------------------------------------------------------*/
1150 if ((rows & 0xf) == 0 || row == rpng2_info.height-1) {
1154 rect.top = (LONG)firstrow;
1155 rect.right = (LONG)rpng2_info.width; /* possibly off by one? */
1156 rect.bottom = (LONG)row + 1L; /* possibly off by one? */
1157 InvalidateRect(global_hwnd, &rect, FALSE);
1158 UpdateWindow(global_hwnd); /* similar to XFlush() */
1162 } /* end function rpng2_win_display_row() */
1168 static void rpng2_win_finish_display()
1170 Trace((stderr, "beginning rpng2_win_finish_display()\n"))
1172 /* last row has already been displayed by rpng2_win_display_row(), so
1173 * we have nothing to do here except set a flag and let the user know
1174 * that the image is done */
1176 rpng2_info.state = kDone;
1179 "Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"
1181 "Done. Press mouse button 1 (within image window) to quit.\n"
1191 static void rpng2_win_cleanup()
1193 if (bg_image && bg_data) {
1198 if (rpng2_info.image_data) {
1199 free(rpng2_info.image_data);
1200 rpng2_info.image_data = NULL;
1203 if (rpng2_info.row_pointers) {
1204 free(rpng2_info.row_pointers);
1205 rpng2_info.row_pointers = NULL;
1218 LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
1226 /* one-time processing here, if any */
1230 hdc = BeginPaint(hwnd, &ps);
1231 rc = StretchDIBits(hdc, 0, 0, rpng2_info.width, rpng2_info.height,
1232 0, 0, rpng2_info.width, rpng2_info.height,
1233 wimage_data, (BITMAPINFO *)bmih,
1235 EndPaint(hwnd, &ps);
1238 /* wait for the user to tell us when to quit */
1240 switch (wP) { /* only need one, so ignore repeat count */
1243 case 0x1B: /* Esc key */
1248 case WM_LBUTTONDOWN: /* another way of quitting */
1254 return DefWindowProc(hwnd, iMsg, wP, lP);