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author | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
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committer | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
commit | 393b5cd1dc438872af89d334ef6e5fcc59f27d47 (patch) | |
tree | 6a14521219942a08a1b95cb2f5a923a9edd60f63 /libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c | |
parent | Add a note about rasters suggested start up code. (diff) | |
download | SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.zip SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.gz SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.bz2 SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.xz |
Added Irrlicht 1.8, but without all the Windows binaries.
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c | 904 |
1 files changed, 904 insertions, 0 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c new file mode 100644 index 0000000..fc8be88 --- /dev/null +++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c | |||
@@ -0,0 +1,904 @@ | |||
1 | /*--------------------------------------------------------------------------- | ||
2 | |||
3 | rpng - simple PNG display program rpng-x.c | ||
4 | |||
5 | This program decodes and displays PNG images, with gamma correction and | ||
6 | optionally with a user-specified background color (in case the image has | ||
7 | transparency). It is very nearly the most basic PNG viewer possible. | ||
8 | This version is for the X Window System (tested by author under Unix and | ||
9 | by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking). | ||
10 | |||
11 | to do: | ||
12 | - 8-bit (colormapped) X support | ||
13 | - use %.1023s to simplify truncation of title-bar string? | ||
14 | |||
15 | --------------------------------------------------------------------------- | ||
16 | |||
17 | Changelog: | ||
18 | - 1.01: initial public release | ||
19 | - 1.02: modified to allow abbreviated options; fixed long/ulong mis- | ||
20 | match; switched to png_jmpbuf() macro | ||
21 | - 1.10: added support for non-default visuals; fixed X pixel-conversion | ||
22 | - 1.11: added extra set of parentheses to png_jmpbuf() macro; fixed | ||
23 | command-line parsing bug | ||
24 | - 1.12: fixed some small X memory leaks (thanks to François Petitjean) | ||
25 | - 1.13: fixed XFreeGC() crash bug (thanks to Patrick Welche) | ||
26 | - 1.14: added support for X resources (thanks to Gerhard Niklasch) | ||
27 | - 2.00: dual-licensed (added GNU GPL) | ||
28 | - 2.01: fixed improper display of usage screen on PNG error(s) | ||
29 | |||
30 | --------------------------------------------------------------------------- | ||
31 | |||
32 | Copyright (c) 1998-2008 Greg Roelofs. All rights reserved. | ||
33 | |||
34 | This software is provided "as is," without warranty of any kind, | ||
35 | express or implied. In no event shall the author or contributors | ||
36 | be held liable for any damages arising in any way from the use of | ||
37 | this software. | ||
38 | |||
39 | The contents of this file are DUAL-LICENSED. You may modify and/or | ||
40 | redistribute this software according to the terms of one of the | ||
41 | following two licenses (at your option): | ||
42 | |||
43 | |||
44 | LICENSE 1 ("BSD-like with advertising clause"): | ||
45 | |||
46 | Permission is granted to anyone to use this software for any purpose, | ||
47 | including commercial applications, and to alter it and redistribute | ||
48 | it freely, subject to the following restrictions: | ||
49 | |||
50 | 1. Redistributions of source code must retain the above copyright | ||
51 | notice, disclaimer, and this list of conditions. | ||
52 | 2. Redistributions in binary form must reproduce the above copyright | ||
53 | notice, disclaimer, and this list of conditions in the documenta- | ||
54 | tion and/or other materials provided with the distribution. | ||
55 | 3. All advertising materials mentioning features or use of this | ||
56 | software must display the following acknowledgment: | ||
57 | |||
58 | This product includes software developed by Greg Roelofs | ||
59 | and contributors for the book, "PNG: The Definitive Guide," | ||
60 | published by O'Reilly and Associates. | ||
61 | |||
62 | |||
63 | LICENSE 2 (GNU GPL v2 or later): | ||
64 | |||
65 | This program is free software; you can redistribute it and/or modify | ||
66 | it under the terms of the GNU General Public License as published by | ||
67 | the Free Software Foundation; either version 2 of the License, or | ||
68 | (at your option) any later version. | ||
69 | |||
70 | This program is distributed in the hope that it will be useful, | ||
71 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
72 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
73 | GNU General Public License for more details. | ||
74 | |||
75 | You should have received a copy of the GNU General Public License | ||
76 | along with this program; if not, write to the Free Software Foundation, | ||
77 | Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
78 | |||
79 | ---------------------------------------------------------------------------*/ | ||
80 | |||
81 | #define PROGNAME "rpng-x" | ||
82 | #define LONGNAME "Simple PNG Viewer for X" | ||
83 | #define VERSION "2.01 of 16 March 2008" | ||
84 | #define RESNAME "rpng" /* our X resource application name */ | ||
85 | #define RESCLASS "Rpng" /* our X resource class name */ | ||
86 | |||
87 | #include <stdio.h> | ||
88 | #include <stdlib.h> | ||
89 | #include <string.h> | ||
90 | #include <time.h> | ||
91 | #include <X11/Xlib.h> | ||
92 | #include <X11/Xutil.h> | ||
93 | #include <X11/Xos.h> | ||
94 | #include <X11/keysym.h> | ||
95 | |||
96 | /* #define DEBUG : this enables the Trace() macros */ | ||
97 | |||
98 | #include "readpng.h" /* typedefs, common macros, readpng prototypes */ | ||
99 | |||
100 | |||
101 | /* could just include png.h, but this macro is the only thing we need | ||
102 | * (name and typedefs changed to local versions); note that side effects | ||
103 | * only happen with alpha (which could easily be avoided with | ||
104 | * "ush acopy = (alpha);") */ | ||
105 | |||
106 | #define alpha_composite(composite, fg, alpha, bg) { \ | ||
107 | ush temp = ((ush)(fg)*(ush)(alpha) + \ | ||
108 | (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \ | ||
109 | (composite) = (uch)((temp + (temp >> 8)) >> 8); \ | ||
110 | } | ||
111 | |||
112 | |||
113 | /* local prototypes */ | ||
114 | static int rpng_x_create_window(void); | ||
115 | static int rpng_x_display_image(void); | ||
116 | static void rpng_x_cleanup(void); | ||
117 | static int rpng_x_msb(ulg u32val); | ||
118 | |||
119 | |||
120 | static char titlebar[1024], *window_name = titlebar; | ||
121 | static char *appname = LONGNAME; | ||
122 | static char *icon_name = PROGNAME; | ||
123 | static char *res_name = RESNAME; | ||
124 | static char *res_class = RESCLASS; | ||
125 | static char *filename; | ||
126 | static FILE *infile; | ||
127 | |||
128 | static char *bgstr; | ||
129 | static uch bg_red=0, bg_green=0, bg_blue=0; | ||
130 | |||
131 | static double display_exponent; | ||
132 | |||
133 | static ulg image_width, image_height, image_rowbytes; | ||
134 | static int image_channels; | ||
135 | static uch *image_data; | ||
136 | |||
137 | /* X-specific variables */ | ||
138 | static char *displayname; | ||
139 | static XImage *ximage; | ||
140 | static Display *display; | ||
141 | static int depth; | ||
142 | static Visual *visual; | ||
143 | static XVisualInfo *visual_list; | ||
144 | static int RShift, GShift, BShift; | ||
145 | static ulg RMask, GMask, BMask; | ||
146 | static Window window; | ||
147 | static GC gc; | ||
148 | static Colormap colormap; | ||
149 | |||
150 | static int have_nondefault_visual = FALSE; | ||
151 | static int have_colormap = FALSE; | ||
152 | static int have_window = FALSE; | ||
153 | static int have_gc = FALSE; | ||
154 | /* | ||
155 | ulg numcolors=0, pixels[256]; | ||
156 | ush reds[256], greens[256], blues[256]; | ||
157 | */ | ||
158 | |||
159 | |||
160 | |||
161 | |||
162 | int main(int argc, char **argv) | ||
163 | { | ||
164 | #ifdef sgi | ||
165 | char tmpline[80]; | ||
166 | #endif | ||
167 | char *p; | ||
168 | int rc, alen, flen; | ||
169 | int error = 0; | ||
170 | int have_bg = FALSE; | ||
171 | double LUT_exponent; /* just the lookup table */ | ||
172 | double CRT_exponent = 2.2; /* just the monitor */ | ||
173 | double default_display_exponent; /* whole display system */ | ||
174 | XEvent e; | ||
175 | KeySym k; | ||
176 | |||
177 | |||
178 | displayname = (char *)NULL; | ||
179 | filename = (char *)NULL; | ||
180 | |||
181 | |||
182 | /* First set the default value for our display-system exponent, i.e., | ||
183 | * the product of the CRT exponent and the exponent corresponding to | ||
184 | * the frame-buffer's lookup table (LUT), if any. This is not an | ||
185 | * exhaustive list of LUT values (e.g., OpenStep has a lot of weird | ||
186 | * ones), but it should cover 99% of the current possibilities. */ | ||
187 | |||
188 | #if defined(NeXT) | ||
189 | LUT_exponent = 1.0 / 2.2; | ||
190 | /* | ||
191 | if (some_next_function_that_returns_gamma(&next_gamma)) | ||
192 | LUT_exponent = 1.0 / next_gamma; | ||
193 | */ | ||
194 | #elif defined(sgi) | ||
195 | LUT_exponent = 1.0 / 1.7; | ||
196 | /* there doesn't seem to be any documented function to get the | ||
197 | * "gamma" value, so we do it the hard way */ | ||
198 | infile = fopen("/etc/config/system.glGammaVal", "r"); | ||
199 | if (infile) { | ||
200 | double sgi_gamma; | ||
201 | |||
202 | fgets(tmpline, 80, infile); | ||
203 | fclose(infile); | ||
204 | sgi_gamma = atof(tmpline); | ||
205 | if (sgi_gamma > 0.0) | ||
206 | LUT_exponent = 1.0 / sgi_gamma; | ||
207 | } | ||
208 | #elif defined(Macintosh) | ||
209 | LUT_exponent = 1.8 / 2.61; | ||
210 | /* | ||
211 | if (some_mac_function_that_returns_gamma(&mac_gamma)) | ||
212 | LUT_exponent = mac_gamma / 2.61; | ||
213 | */ | ||
214 | #else | ||
215 | LUT_exponent = 1.0; /* assume no LUT: most PCs */ | ||
216 | #endif | ||
217 | |||
218 | /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */ | ||
219 | default_display_exponent = LUT_exponent * CRT_exponent; | ||
220 | |||
221 | |||
222 | /* If the user has set the SCREEN_GAMMA environment variable as suggested | ||
223 | * (somewhat imprecisely) in the libpng documentation, use that; otherwise | ||
224 | * use the default value we just calculated. Either way, the user may | ||
225 | * override this via a command-line option. */ | ||
226 | |||
227 | if ((p = getenv("SCREEN_GAMMA")) != NULL) | ||
228 | display_exponent = atof(p); | ||
229 | else | ||
230 | display_exponent = default_display_exponent; | ||
231 | |||
232 | |||
233 | /* Now parse the command line for options and the PNG filename. */ | ||
234 | |||
235 | while (*++argv && !error) { | ||
236 | if (!strncmp(*argv, "-display", 2)) { | ||
237 | if (!*++argv) | ||
238 | ++error; | ||
239 | else | ||
240 | displayname = *argv; | ||
241 | } else if (!strncmp(*argv, "-gamma", 2)) { | ||
242 | if (!*++argv) | ||
243 | ++error; | ||
244 | else { | ||
245 | display_exponent = atof(*argv); | ||
246 | if (display_exponent <= 0.0) | ||
247 | ++error; | ||
248 | } | ||
249 | } else if (!strncmp(*argv, "-bgcolor", 2)) { | ||
250 | if (!*++argv) | ||
251 | ++error; | ||
252 | else { | ||
253 | bgstr = *argv; | ||
254 | if (strlen(bgstr) != 7 || bgstr[0] != '#') | ||
255 | ++error; | ||
256 | else | ||
257 | have_bg = TRUE; | ||
258 | } | ||
259 | } else { | ||
260 | if (**argv != '-') { | ||
261 | filename = *argv; | ||
262 | if (argv[1]) /* shouldn't be any more args after filename */ | ||
263 | ++error; | ||
264 | } else | ||
265 | ++error; /* not expecting any other options */ | ||
266 | } | ||
267 | } | ||
268 | |||
269 | if (!filename) | ||
270 | ++error; | ||
271 | |||
272 | |||
273 | /* print usage screen if any errors up to this point */ | ||
274 | |||
275 | if (error) { | ||
276 | fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname); | ||
277 | readpng_version_info(); | ||
278 | fprintf(stderr, "\n" | ||
279 | "Usage: %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n" | ||
280 | " xdpy\tname of the target X display (e.g., ``hostname:0'')\n" | ||
281 | " exp \ttransfer-function exponent (``gamma'') of the display\n" | ||
282 | "\t\t system in floating-point format (e.g., ``%.1f''); equal\n" | ||
283 | "\t\t to the product of the lookup-table exponent (varies)\n" | ||
284 | "\t\t and the CRT exponent (usually 2.2); must be positive\n" | ||
285 | " bg \tdesired background color in 7-character hex RGB format\n" | ||
286 | "\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n" | ||
287 | "\t\t used with transparent images\n" | ||
288 | "\nPress Q, Esc or mouse button 1 (within image window, after image\n" | ||
289 | "is displayed) to quit.\n" | ||
290 | "\n", PROGNAME, default_display_exponent); | ||
291 | exit(1); | ||
292 | } | ||
293 | |||
294 | |||
295 | if (!(infile = fopen(filename, "rb"))) { | ||
296 | fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename); | ||
297 | ++error; | ||
298 | } else { | ||
299 | if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) { | ||
300 | switch (rc) { | ||
301 | case 1: | ||
302 | fprintf(stderr, PROGNAME | ||
303 | ": [%s] is not a PNG file: incorrect signature\n", | ||
304 | filename); | ||
305 | break; | ||
306 | case 2: | ||
307 | fprintf(stderr, PROGNAME | ||
308 | ": [%s] has bad IHDR (libpng longjmp)\n", filename); | ||
309 | break; | ||
310 | case 4: | ||
311 | fprintf(stderr, PROGNAME ": insufficient memory\n"); | ||
312 | break; | ||
313 | default: | ||
314 | fprintf(stderr, PROGNAME | ||
315 | ": unknown readpng_init() error\n"); | ||
316 | break; | ||
317 | } | ||
318 | ++error; | ||
319 | } else { | ||
320 | display = XOpenDisplay(displayname); | ||
321 | if (!display) { | ||
322 | readpng_cleanup(TRUE); | ||
323 | fprintf(stderr, PROGNAME ": can't open X display [%s]\n", | ||
324 | displayname? displayname : "default"); | ||
325 | ++error; | ||
326 | } | ||
327 | } | ||
328 | if (error) | ||
329 | fclose(infile); | ||
330 | } | ||
331 | |||
332 | |||
333 | if (error) { | ||
334 | fprintf(stderr, PROGNAME ": aborting.\n"); | ||
335 | exit(2); | ||
336 | } | ||
337 | |||
338 | |||
339 | /* set the title-bar string, but make sure buffer doesn't overflow */ | ||
340 | |||
341 | alen = strlen(appname); | ||
342 | flen = strlen(filename); | ||
343 | if (alen + flen + 3 > 1023) | ||
344 | sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023)); | ||
345 | else | ||
346 | sprintf(titlebar, "%s: %s", appname, filename); | ||
347 | |||
348 | |||
349 | /* if the user didn't specify a background color on the command line, | ||
350 | * check for one in the PNG file--if not, the initialized values of 0 | ||
351 | * (black) will be used */ | ||
352 | |||
353 | if (have_bg) { | ||
354 | unsigned r, g, b; /* this approach quiets compiler warnings */ | ||
355 | |||
356 | sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b); | ||
357 | bg_red = (uch)r; | ||
358 | bg_green = (uch)g; | ||
359 | bg_blue = (uch)b; | ||
360 | } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) { | ||
361 | readpng_cleanup(TRUE); | ||
362 | fprintf(stderr, PROGNAME | ||
363 | ": libpng error while checking for background color\n"); | ||
364 | exit(2); | ||
365 | } | ||
366 | |||
367 | |||
368 | /* do the basic X initialization stuff, make the window and fill it | ||
369 | * with the background color */ | ||
370 | |||
371 | if (rpng_x_create_window()) | ||
372 | exit(2); | ||
373 | |||
374 | |||
375 | /* decode the image, all at once */ | ||
376 | |||
377 | Trace((stderr, "calling readpng_get_image()\n")) | ||
378 | image_data = readpng_get_image(display_exponent, &image_channels, | ||
379 | &image_rowbytes); | ||
380 | Trace((stderr, "done with readpng_get_image()\n")) | ||
381 | |||
382 | |||
383 | /* done with PNG file, so clean up to minimize memory usage (but do NOT | ||
384 | * nuke image_data!) */ | ||
385 | |||
386 | readpng_cleanup(FALSE); | ||
387 | fclose(infile); | ||
388 | |||
389 | if (!image_data) { | ||
390 | fprintf(stderr, PROGNAME ": unable to decode PNG image\n"); | ||
391 | exit(3); | ||
392 | } | ||
393 | |||
394 | |||
395 | /* display image (composite with background if requested) */ | ||
396 | |||
397 | Trace((stderr, "calling rpng_x_display_image()\n")) | ||
398 | if (rpng_x_display_image()) { | ||
399 | free(image_data); | ||
400 | exit(4); | ||
401 | } | ||
402 | Trace((stderr, "done with rpng_x_display_image()\n")) | ||
403 | |||
404 | |||
405 | /* wait for the user to tell us when to quit */ | ||
406 | |||
407 | printf( | ||
408 | "Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"); | ||
409 | fflush(stdout); | ||
410 | |||
411 | do | ||
412 | XNextEvent(display, &e); | ||
413 | while (!(e.type == ButtonPress && e.xbutton.button == Button1) && | ||
414 | !(e.type == KeyPress && /* v--- or 1 for shifted keys */ | ||
415 | ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape) )); | ||
416 | |||
417 | |||
418 | /* OK, we're done: clean up all image and X resources and go away */ | ||
419 | |||
420 | rpng_x_cleanup(); | ||
421 | |||
422 | return 0; | ||
423 | } | ||
424 | |||
425 | |||
426 | |||
427 | |||
428 | |||
429 | static int rpng_x_create_window(void) | ||
430 | { | ||
431 | uch *xdata; | ||
432 | int need_colormap = FALSE; | ||
433 | int screen, pad; | ||
434 | ulg bg_pixel = 0L; | ||
435 | ulg attrmask; | ||
436 | Window root; | ||
437 | XEvent e; | ||
438 | XGCValues gcvalues; | ||
439 | XSetWindowAttributes attr; | ||
440 | XTextProperty windowName, *pWindowName = &windowName; | ||
441 | XTextProperty iconName, *pIconName = &iconName; | ||
442 | XVisualInfo visual_info; | ||
443 | XSizeHints *size_hints; | ||
444 | XWMHints *wm_hints; | ||
445 | XClassHint *class_hints; | ||
446 | |||
447 | |||
448 | screen = DefaultScreen(display); | ||
449 | depth = DisplayPlanes(display, screen); | ||
450 | root = RootWindow(display, screen); | ||
451 | |||
452 | #ifdef DEBUG | ||
453 | XSynchronize(display, True); | ||
454 | #endif | ||
455 | |||
456 | #if 0 | ||
457 | /* GRR: add 8-bit support */ | ||
458 | if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) { | ||
459 | fprintf(stderr, | ||
460 | "screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n", | ||
461 | depth); | ||
462 | return 2; | ||
463 | } | ||
464 | |||
465 | XMatchVisualInfo(display, screen, depth, | ||
466 | (depth == 8)? PseudoColor : TrueColor, &visual_info); | ||
467 | visual = visual_info.visual; | ||
468 | #else | ||
469 | if (depth != 16 && depth != 24 && depth != 32) { | ||
470 | int visuals_matched = 0; | ||
471 | |||
472 | Trace((stderr, "default depth is %d: checking other visuals\n", | ||
473 | depth)) | ||
474 | |||
475 | /* 24-bit first */ | ||
476 | visual_info.screen = screen; | ||
477 | visual_info.depth = 24; | ||
478 | visual_list = XGetVisualInfo(display, | ||
479 | VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched); | ||
480 | if (visuals_matched == 0) { | ||
481 | /* GRR: add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */ | ||
482 | fprintf(stderr, "default screen depth %d not supported, and no" | ||
483 | " 24-bit visuals found\n", depth); | ||
484 | return 2; | ||
485 | } | ||
486 | Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n", | ||
487 | visuals_matched)) | ||
488 | visual = visual_list[0].visual; | ||
489 | depth = visual_list[0].depth; | ||
490 | /* | ||
491 | colormap_size = visual_list[0].colormap_size; | ||
492 | visual_class = visual->class; | ||
493 | visualID = XVisualIDFromVisual(visual); | ||
494 | */ | ||
495 | have_nondefault_visual = TRUE; | ||
496 | need_colormap = TRUE; | ||
497 | } else { | ||
498 | XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info); | ||
499 | visual = visual_info.visual; | ||
500 | } | ||
501 | #endif | ||
502 | |||
503 | RMask = visual->red_mask; | ||
504 | GMask = visual->green_mask; | ||
505 | BMask = visual->blue_mask; | ||
506 | |||
507 | /* GRR: add/check 8-bit support */ | ||
508 | if (depth == 8 || need_colormap) { | ||
509 | colormap = XCreateColormap(display, root, visual, AllocNone); | ||
510 | if (!colormap) { | ||
511 | fprintf(stderr, "XCreateColormap() failed\n"); | ||
512 | return 2; | ||
513 | } | ||
514 | have_colormap = TRUE; | ||
515 | } | ||
516 | if (depth == 15 || depth == 16) { | ||
517 | RShift = 15 - rpng_x_msb(RMask); /* these are right-shifts */ | ||
518 | GShift = 15 - rpng_x_msb(GMask); | ||
519 | BShift = 15 - rpng_x_msb(BMask); | ||
520 | } else if (depth > 16) { | ||
521 | #define NO_24BIT_MASKS | ||
522 | #ifdef NO_24BIT_MASKS | ||
523 | RShift = rpng_x_msb(RMask) - 7; /* these are left-shifts */ | ||
524 | GShift = rpng_x_msb(GMask) - 7; | ||
525 | BShift = rpng_x_msb(BMask) - 7; | ||
526 | #else | ||
527 | RShift = 7 - rpng_x_msb(RMask); /* these are right-shifts, too */ | ||
528 | GShift = 7 - rpng_x_msb(GMask); | ||
529 | BShift = 7 - rpng_x_msb(BMask); | ||
530 | #endif | ||
531 | } | ||
532 | if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) { | ||
533 | fprintf(stderr, "rpng internal logic error: negative X shift(s)!\n"); | ||
534 | return 2; | ||
535 | } | ||
536 | |||
537 | /*--------------------------------------------------------------------------- | ||
538 | Finally, create the window. | ||
539 | ---------------------------------------------------------------------------*/ | ||
540 | |||
541 | attr.backing_store = Always; | ||
542 | attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask; | ||
543 | attrmask = CWBackingStore | CWEventMask; | ||
544 | if (have_nondefault_visual) { | ||
545 | attr.colormap = colormap; | ||
546 | attr.background_pixel = 0; | ||
547 | attr.border_pixel = 1; | ||
548 | attrmask |= CWColormap | CWBackPixel | CWBorderPixel; | ||
549 | } | ||
550 | |||
551 | window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0, | ||
552 | depth, InputOutput, visual, attrmask, &attr); | ||
553 | |||
554 | if (window == None) { | ||
555 | fprintf(stderr, "XCreateWindow() failed\n"); | ||
556 | return 2; | ||
557 | } else | ||
558 | have_window = TRUE; | ||
559 | |||
560 | if (depth == 8) | ||
561 | XSetWindowColormap(display, window, colormap); | ||
562 | |||
563 | if (!XStringListToTextProperty(&window_name, 1, pWindowName)) | ||
564 | pWindowName = NULL; | ||
565 | if (!XStringListToTextProperty(&icon_name, 1, pIconName)) | ||
566 | pIconName = NULL; | ||
567 | |||
568 | /* OK if any hints allocation fails; XSetWMProperties() allows NULLs */ | ||
569 | |||
570 | if ((size_hints = XAllocSizeHints()) != NULL) { | ||
571 | /* window will not be resizable */ | ||
572 | size_hints->flags = PMinSize | PMaxSize; | ||
573 | size_hints->min_width = size_hints->max_width = (int)image_width; | ||
574 | size_hints->min_height = size_hints->max_height = (int)image_height; | ||
575 | } | ||
576 | |||
577 | if ((wm_hints = XAllocWMHints()) != NULL) { | ||
578 | wm_hints->initial_state = NormalState; | ||
579 | wm_hints->input = True; | ||
580 | /* wm_hints->icon_pixmap = icon_pixmap; */ | ||
581 | wm_hints->flags = StateHint | InputHint /* | IconPixmapHint */ ; | ||
582 | } | ||
583 | |||
584 | if ((class_hints = XAllocClassHint()) != NULL) { | ||
585 | class_hints->res_name = res_name; | ||
586 | class_hints->res_class = res_class; | ||
587 | } | ||
588 | |||
589 | XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0, | ||
590 | size_hints, wm_hints, class_hints); | ||
591 | |||
592 | /* various properties and hints no longer needed; free memory */ | ||
593 | if (pWindowName) | ||
594 | XFree(pWindowName->value); | ||
595 | if (pIconName) | ||
596 | XFree(pIconName->value); | ||
597 | if (size_hints) | ||
598 | XFree(size_hints); | ||
599 | if (wm_hints) | ||
600 | XFree(wm_hints); | ||
601 | if (class_hints) | ||
602 | XFree(class_hints); | ||
603 | |||
604 | XMapWindow(display, window); | ||
605 | |||
606 | gc = XCreateGC(display, window, 0, &gcvalues); | ||
607 | have_gc = TRUE; | ||
608 | |||
609 | /*--------------------------------------------------------------------------- | ||
610 | Fill window with the specified background color. | ||
611 | ---------------------------------------------------------------------------*/ | ||
612 | |||
613 | if (depth == 24 || depth == 32) { | ||
614 | bg_pixel = ((ulg)bg_red << RShift) | | ||
615 | ((ulg)bg_green << GShift) | | ||
616 | ((ulg)bg_blue << BShift); | ||
617 | } else if (depth == 16) { | ||
618 | bg_pixel = ((((ulg)bg_red << 8) >> RShift) & RMask) | | ||
619 | ((((ulg)bg_green << 8) >> GShift) & GMask) | | ||
620 | ((((ulg)bg_blue << 8) >> BShift) & BMask); | ||
621 | } else /* depth == 8 */ { | ||
622 | |||
623 | /* GRR: add 8-bit support */ | ||
624 | |||
625 | } | ||
626 | |||
627 | XSetForeground(display, gc, bg_pixel); | ||
628 | XFillRectangle(display, window, gc, 0, 0, image_width, image_height); | ||
629 | |||
630 | /*--------------------------------------------------------------------------- | ||
631 | Wait for first Expose event to do any drawing, then flush. | ||
632 | ---------------------------------------------------------------------------*/ | ||
633 | |||
634 | do | ||
635 | XNextEvent(display, &e); | ||
636 | while (e.type != Expose || e.xexpose.count); | ||
637 | |||
638 | XFlush(display); | ||
639 | |||
640 | /*--------------------------------------------------------------------------- | ||
641 | Allocate memory for the X- and display-specific version of the image. | ||
642 | ---------------------------------------------------------------------------*/ | ||
643 | |||
644 | if (depth == 24 || depth == 32) { | ||
645 | xdata = (uch *)malloc(4*image_width*image_height); | ||
646 | pad = 32; | ||
647 | } else if (depth == 16) { | ||
648 | xdata = (uch *)malloc(2*image_width*image_height); | ||
649 | pad = 16; | ||
650 | } else /* depth == 8 */ { | ||
651 | xdata = (uch *)malloc(image_width*image_height); | ||
652 | pad = 8; | ||
653 | } | ||
654 | |||
655 | if (!xdata) { | ||
656 | fprintf(stderr, PROGNAME ": unable to allocate image memory\n"); | ||
657 | return 4; | ||
658 | } | ||
659 | |||
660 | ximage = XCreateImage(display, visual, depth, ZPixmap, 0, | ||
661 | (char *)xdata, image_width, image_height, pad, 0); | ||
662 | |||
663 | if (!ximage) { | ||
664 | fprintf(stderr, PROGNAME ": XCreateImage() failed\n"); | ||
665 | free(xdata); | ||
666 | return 3; | ||
667 | } | ||
668 | |||
669 | /* to avoid testing the byte order every pixel (or doubling the size of | ||
670 | * the drawing routine with a giant if-test), we arbitrarily set the byte | ||
671 | * order to MSBFirst and let Xlib worry about inverting things on little- | ||
672 | * endian machines (like Linux/x86, old VAXen, etc.)--this is not the most | ||
673 | * efficient approach (the giant if-test would be better), but in the | ||
674 | * interest of clarity, we take the easy way out... */ | ||
675 | |||
676 | ximage->byte_order = MSBFirst; | ||
677 | |||
678 | return 0; | ||
679 | |||
680 | } /* end function rpng_x_create_window() */ | ||
681 | |||
682 | |||
683 | |||
684 | |||
685 | |||
686 | static int rpng_x_display_image(void) | ||
687 | { | ||
688 | uch *src; | ||
689 | char *dest; | ||
690 | uch r, g, b, a; | ||
691 | ulg i, row, lastrow = 0; | ||
692 | ulg pixel; | ||
693 | int ximage_rowbytes = ximage->bytes_per_line; | ||
694 | /* int bpp = ximage->bits_per_pixel; */ | ||
695 | |||
696 | |||
697 | Trace((stderr, "beginning display loop (image_channels == %d)\n", | ||
698 | image_channels)) | ||
699 | Trace((stderr, " (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n", | ||
700 | image_width, image_rowbytes, ximage_rowbytes)) | ||
701 | Trace((stderr, " (bpp = %d)\n", ximage->bits_per_pixel)) | ||
702 | Trace((stderr, " (byte_order = %s)\n", ximage->byte_order == MSBFirst? | ||
703 | "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown"))) | ||
704 | |||
705 | if (depth == 24 || depth == 32) { | ||
706 | ulg red, green, blue; | ||
707 | |||
708 | for (lastrow = row = 0; row < image_height; ++row) { | ||
709 | src = image_data + row*image_rowbytes; | ||
710 | dest = ximage->data + row*ximage_rowbytes; | ||
711 | if (image_channels == 3) { | ||
712 | for (i = image_width; i > 0; --i) { | ||
713 | red = *src++; | ||
714 | green = *src++; | ||
715 | blue = *src++; | ||
716 | #ifdef NO_24BIT_MASKS | ||
717 | pixel = (red << RShift) | | ||
718 | (green << GShift) | | ||
719 | (blue << BShift); | ||
720 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
721 | /* GRR BUG: this assumes bpp == 32, but may be 24: */ | ||
722 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
723 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
724 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
725 | *dest++ = (char)( pixel & 0xff); | ||
726 | #else | ||
727 | red = (RShift < 0)? red << (-RShift) : red >> RShift; | ||
728 | green = (GShift < 0)? green << (-GShift) : green >> GShift; | ||
729 | blue = (BShift < 0)? blue << (-BShift) : blue >> BShift; | ||
730 | pixel = (red & RMask) | (green & GMask) | (blue & BMask); | ||
731 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
732 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
733 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
734 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
735 | *dest++ = (char)( pixel & 0xff); | ||
736 | #endif | ||
737 | } | ||
738 | } else /* if (image_channels == 4) */ { | ||
739 | for (i = image_width; i > 0; --i) { | ||
740 | r = *src++; | ||
741 | g = *src++; | ||
742 | b = *src++; | ||
743 | a = *src++; | ||
744 | if (a == 255) { | ||
745 | red = r; | ||
746 | green = g; | ||
747 | blue = b; | ||
748 | } else if (a == 0) { | ||
749 | red = bg_red; | ||
750 | green = bg_green; | ||
751 | blue = bg_blue; | ||
752 | } else { | ||
753 | /* this macro (from png.h) composites the foreground | ||
754 | * and background values and puts the result into the | ||
755 | * first argument */ | ||
756 | alpha_composite(red, r, a, bg_red); | ||
757 | alpha_composite(green, g, a, bg_green); | ||
758 | alpha_composite(blue, b, a, bg_blue); | ||
759 | } | ||
760 | pixel = (red << RShift) | | ||
761 | (green << GShift) | | ||
762 | (blue << BShift); | ||
763 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
764 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
765 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
766 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
767 | *dest++ = (char)( pixel & 0xff); | ||
768 | } | ||
769 | } | ||
770 | /* display after every 16 lines */ | ||
771 | if (((row+1) & 0xf) == 0) { | ||
772 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, | ||
773 | (int)lastrow, image_width, 16); | ||
774 | XFlush(display); | ||
775 | lastrow = row + 1; | ||
776 | } | ||
777 | } | ||
778 | |||
779 | } else if (depth == 16) { | ||
780 | ush red, green, blue; | ||
781 | |||
782 | for (lastrow = row = 0; row < image_height; ++row) { | ||
783 | src = image_data + row*image_rowbytes; | ||
784 | dest = ximage->data + row*ximage_rowbytes; | ||
785 | if (image_channels == 3) { | ||
786 | for (i = image_width; i > 0; --i) { | ||
787 | red = ((ush)(*src) << 8); | ||
788 | ++src; | ||
789 | green = ((ush)(*src) << 8); | ||
790 | ++src; | ||
791 | blue = ((ush)(*src) << 8); | ||
792 | ++src; | ||
793 | pixel = ((red >> RShift) & RMask) | | ||
794 | ((green >> GShift) & GMask) | | ||
795 | ((blue >> BShift) & BMask); | ||
796 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
797 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
798 | *dest++ = (char)( pixel & 0xff); | ||
799 | } | ||
800 | } else /* if (image_channels == 4) */ { | ||
801 | for (i = image_width; i > 0; --i) { | ||
802 | r = *src++; | ||
803 | g = *src++; | ||
804 | b = *src++; | ||
805 | a = *src++; | ||
806 | if (a == 255) { | ||
807 | red = ((ush)r << 8); | ||
808 | green = ((ush)g << 8); | ||
809 | blue = ((ush)b << 8); | ||
810 | } else if (a == 0) { | ||
811 | red = ((ush)bg_red << 8); | ||
812 | green = ((ush)bg_green << 8); | ||
813 | blue = ((ush)bg_blue << 8); | ||
814 | } else { | ||
815 | /* this macro (from png.h) composites the foreground | ||
816 | * and background values and puts the result back into | ||
817 | * the first argument (== fg byte here: safe) */ | ||
818 | alpha_composite(r, r, a, bg_red); | ||
819 | alpha_composite(g, g, a, bg_green); | ||
820 | alpha_composite(b, b, a, bg_blue); | ||
821 | red = ((ush)r << 8); | ||
822 | green = ((ush)g << 8); | ||
823 | blue = ((ush)b << 8); | ||
824 | } | ||
825 | pixel = ((red >> RShift) & RMask) | | ||
826 | ((green >> GShift) & GMask) | | ||
827 | ((blue >> BShift) & BMask); | ||
828 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
829 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
830 | *dest++ = (char)( pixel & 0xff); | ||
831 | } | ||
832 | } | ||
833 | /* display after every 16 lines */ | ||
834 | if (((row+1) & 0xf) == 0) { | ||
835 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, | ||
836 | (int)lastrow, image_width, 16); | ||
837 | XFlush(display); | ||
838 | lastrow = row + 1; | ||
839 | } | ||
840 | } | ||
841 | |||
842 | } else /* depth == 8 */ { | ||
843 | |||
844 | /* GRR: add 8-bit support */ | ||
845 | |||
846 | } | ||
847 | |||
848 | Trace((stderr, "calling final XPutImage()\n")) | ||
849 | if (lastrow < image_height) { | ||
850 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, | ||
851 | (int)lastrow, image_width, image_height-lastrow); | ||
852 | XFlush(display); | ||
853 | } | ||
854 | |||
855 | return 0; | ||
856 | } | ||
857 | |||
858 | |||
859 | |||
860 | |||
861 | static void rpng_x_cleanup(void) | ||
862 | { | ||
863 | if (image_data) { | ||
864 | free(image_data); | ||
865 | image_data = NULL; | ||
866 | } | ||
867 | |||
868 | if (ximage) { | ||
869 | if (ximage->data) { | ||
870 | free(ximage->data); /* we allocated it, so we free it */ | ||
871 | ximage->data = (char *)NULL; /* instead of XDestroyImage() */ | ||
872 | } | ||
873 | XDestroyImage(ximage); | ||
874 | ximage = NULL; | ||
875 | } | ||
876 | |||
877 | if (have_gc) | ||
878 | XFreeGC(display, gc); | ||
879 | |||
880 | if (have_window) | ||
881 | XDestroyWindow(display, window); | ||
882 | |||
883 | if (have_colormap) | ||
884 | XFreeColormap(display, colormap); | ||
885 | |||
886 | if (have_nondefault_visual) | ||
887 | XFree(visual_list); | ||
888 | } | ||
889 | |||
890 | |||
891 | |||
892 | |||
893 | |||
894 | static int rpng_x_msb(ulg u32val) | ||
895 | { | ||
896 | int i; | ||
897 | |||
898 | for (i = 31; i >= 0; --i) { | ||
899 | if (u32val & 0x80000000L) | ||
900 | break; | ||
901 | u32val <<= 1; | ||
902 | } | ||
903 | return i; | ||
904 | } | ||