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-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c | 2107 |
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diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c new file mode 100644 index 0000000..6c687db --- /dev/null +++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c | |||
@@ -0,0 +1,2107 @@ | |||
1 | /*--------------------------------------------------------------------------- | ||
2 | |||
3 | rpng2 - progressive-model PNG display program rpng2-x.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 the X Window System (tested by the author under Unix and by Martin | ||
10 | Zinser under OpenVMS; may work under OS/2 with a little tweaking). | ||
11 | |||
12 | Thanks to Adam Costello and Pieter S. van der Meulen for the "diamond" | ||
13 | and "radial waves" patterns, respectively. | ||
14 | |||
15 | to do (someday, maybe): | ||
16 | - fix expose/redraw code: don't draw entire row if only part exposed | ||
17 | - 8-bit (colormapped) X support | ||
18 | - finish resizable checkerboard-gradient (sizes 4-128?) | ||
19 | - use %.1023s to simplify truncation of title-bar string? | ||
20 | |||
21 | --------------------------------------------------------------------------- | ||
22 | |||
23 | Changelog: | ||
24 | - 1.01: initial public release | ||
25 | - 1.02: modified to allow abbreviated options; fixed char/uchar mismatch | ||
26 | - 1.10: added support for non-default visuals; fixed X pixel-conversion | ||
27 | - 1.11: added -usleep option for demos; fixed command-line parsing bug | ||
28 | - 1.12: added -pause option for demos and testing | ||
29 | - 1.20: added runtime MMX-enabling/disabling and new -mmx* options | ||
30 | - 1.21: fixed some small X memory leaks (thanks to François Petitjean) | ||
31 | - 1.22: fixed XFreeGC() crash bug (thanks to Patrick Welche) | ||
32 | - 1.23: added -bgpat 0 mode (std white/gray checkerboard, 8x8 squares) | ||
33 | - 1.30: added -loop option for -bgpat (ifdef FEATURE_LOOP); fixed bpp = | ||
34 | 24; added support for X resources (thanks to Gerhard Niklasch) | ||
35 | - 1.31: added code to skip unused chunks (thanks to Glenn Randers-Pehrson) | ||
36 | - 1.32: added AMD64/EM64T support (__x86_64__); added basic expose/redraw | ||
37 | handling | ||
38 | - 2.00: dual-licensed (added GNU GPL) | ||
39 | - 2.01: fixed 64-bit typo in readpng2.c; fixed -pause usage description | ||
40 | - 2.02: fixed improper display of usage screen on PNG error(s); fixed | ||
41 | unexpected-EOF and file-read-error cases; fixed Trace() cut-and- | ||
42 | paste bugs | ||
43 | - 2.03: deleted runtime MMX-enabling/disabling and obsolete -mmx* options | ||
44 | |||
45 | --------------------------------------------------------------------------- | ||
46 | |||
47 | Copyright (c) 1998-2008 Greg Roelofs. All rights reserved. | ||
48 | |||
49 | This software is provided "as is," without warranty of any kind, | ||
50 | express or implied. In no event shall the author or contributors | ||
51 | be held liable for any damages arising in any way from the use of | ||
52 | this software. | ||
53 | |||
54 | The contents of this file are DUAL-LICENSED. You may modify and/or | ||
55 | redistribute this software according to the terms of one of the | ||
56 | following two licenses (at your option): | ||
57 | |||
58 | |||
59 | LICENSE 1 ("BSD-like with advertising clause"): | ||
60 | |||
61 | Permission is granted to anyone to use this software for any purpose, | ||
62 | including commercial applications, and to alter it and redistribute | ||
63 | it freely, subject to the following restrictions: | ||
64 | |||
65 | 1. Redistributions of source code must retain the above copyright | ||
66 | notice, disclaimer, and this list of conditions. | ||
67 | 2. Redistributions in binary form must reproduce the above copyright | ||
68 | notice, disclaimer, and this list of conditions in the documenta- | ||
69 | tion and/or other materials provided with the distribution. | ||
70 | 3. All advertising materials mentioning features or use of this | ||
71 | software must display the following acknowledgment: | ||
72 | |||
73 | This product includes software developed by Greg Roelofs | ||
74 | and contributors for the book, "PNG: The Definitive Guide," | ||
75 | published by O'Reilly and Associates. | ||
76 | |||
77 | |||
78 | LICENSE 2 (GNU GPL v2 or later): | ||
79 | |||
80 | This program is free software; you can redistribute it and/or modify | ||
81 | it under the terms of the GNU General Public License as published by | ||
82 | the Free Software Foundation; either version 2 of the License, or | ||
83 | (at your option) any later version. | ||
84 | |||
85 | This program is distributed in the hope that it will be useful, | ||
86 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
87 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
88 | GNU General Public License for more details. | ||
89 | |||
90 | You should have received a copy of the GNU General Public License | ||
91 | along with this program; if not, write to the Free Software Foundation, | ||
92 | Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
93 | |||
94 | ---------------------------------------------------------------------------*/ | ||
95 | |||
96 | #define PROGNAME "rpng2-x" | ||
97 | #define LONGNAME "Progressive PNG Viewer for X" | ||
98 | #define VERSION "2.03 of 25 February 2010" | ||
99 | #define RESNAME "rpng2" /* our X resource application name */ | ||
100 | #define RESCLASS "Rpng" /* our X resource class name */ | ||
101 | |||
102 | #include <stdio.h> | ||
103 | #include <stdlib.h> | ||
104 | #include <ctype.h> | ||
105 | #include <string.h> | ||
106 | #include <setjmp.h> /* for jmpbuf declaration in readpng2.h */ | ||
107 | #include <time.h> | ||
108 | #include <math.h> /* only for PvdM background code */ | ||
109 | #include <X11/Xlib.h> | ||
110 | #include <X11/Xutil.h> | ||
111 | #include <X11/Xos.h> | ||
112 | #include <X11/keysym.h> /* defines XK_* macros */ | ||
113 | |||
114 | #ifdef VMS | ||
115 | # include <unistd.h> | ||
116 | #endif | ||
117 | |||
118 | /* all for PvdM background code: */ | ||
119 | #ifndef PI | ||
120 | # define PI 3.141592653589793238 | ||
121 | #endif | ||
122 | #define PI_2 (PI*0.5) | ||
123 | #define INV_PI_360 (360.0 / PI) | ||
124 | #define MAX(a,b) (a>b?a:b) | ||
125 | #define MIN(a,b) (a<b?a:b) | ||
126 | #define CLIP(a,min,max) MAX(min,MIN((a),max)) | ||
127 | #define ABS(a) ((a)<0?-(a):(a)) | ||
128 | #define CLIP8P(c) MAX(0,(MIN((c),255))) /* 8-bit pos. integer (uch) */ | ||
129 | #define ROUNDF(f) ((int)(f + 0.5)) | ||
130 | |||
131 | #define QUIT(e,k) ((e.type == ButtonPress && e.xbutton.button == Button1) || \ | ||
132 | (e.type == KeyPress && /* v--- or 1 for shifted keys */ \ | ||
133 | ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape))) | ||
134 | |||
135 | #define NO_24BIT_MASKS /* undef case not fully written--only for redisplay() */ | ||
136 | |||
137 | #define rgb1_max bg_freq | ||
138 | #define rgb1_min bg_gray | ||
139 | #define rgb2_max bg_bsat | ||
140 | #define rgb2_min bg_brot | ||
141 | |||
142 | /* #define DEBUG */ /* this enables the Trace() macros */ | ||
143 | |||
144 | #include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */ | ||
145 | |||
146 | |||
147 | /* could just include png.h, but this macro is the only thing we need | ||
148 | * (name and typedefs changed to local versions); note that side effects | ||
149 | * only happen with alpha (which could easily be avoided with | ||
150 | * "ush acopy = (alpha);") */ | ||
151 | |||
152 | #define alpha_composite(composite, fg, alpha, bg) { \ | ||
153 | ush temp = ((ush)(fg)*(ush)(alpha) + \ | ||
154 | (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \ | ||
155 | (composite) = (uch)((temp + (temp >> 8)) >> 8); \ | ||
156 | } | ||
157 | |||
158 | |||
159 | #define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this | ||
160 | * block size corresponds roughly to a download | ||
161 | * speed 10% faster than theoretical 33.6K maximum | ||
162 | * (assuming 8 data bits, 1 stop bit and no other | ||
163 | * overhead) */ | ||
164 | |||
165 | /* local prototypes */ | ||
166 | static void rpng2_x_init (void); | ||
167 | static int rpng2_x_create_window (void); | ||
168 | static int rpng2_x_load_bg_image (void); | ||
169 | static void rpng2_x_display_row (ulg row); | ||
170 | static void rpng2_x_finish_display (void); | ||
171 | static void rpng2_x_redisplay_image (ulg startcol, ulg startrow, | ||
172 | ulg width, ulg height); | ||
173 | #ifdef FEATURE_LOOP | ||
174 | static void rpng2_x_reload_bg_image (void); | ||
175 | static int is_number (char *p); | ||
176 | #endif | ||
177 | static void rpng2_x_cleanup (void); | ||
178 | static int rpng2_x_msb (ulg u32val); | ||
179 | |||
180 | |||
181 | static char titlebar[1024], *window_name = titlebar; | ||
182 | static char *appname = LONGNAME; | ||
183 | static char *icon_name = PROGNAME; | ||
184 | static char *res_name = RESNAME; | ||
185 | static char *res_class = RESCLASS; | ||
186 | static char *filename; | ||
187 | static FILE *infile; | ||
188 | |||
189 | static mainprog_info rpng2_info; | ||
190 | |||
191 | static uch inbuf[INBUFSIZE]; | ||
192 | static int incount; | ||
193 | |||
194 | static int pat = 6; /* must be less than num_bgpat */ | ||
195 | static int bg_image = 0; | ||
196 | static int bgscale, bgscale_default = 16; | ||
197 | static ulg bg_rowbytes; | ||
198 | static uch *bg_data; | ||
199 | |||
200 | int pause_after_pass = FALSE; | ||
201 | int demo_timing = FALSE; | ||
202 | ulg usleep_duration = 0L; | ||
203 | |||
204 | static struct rgb_color { | ||
205 | uch r, g, b; | ||
206 | } rgb[] = { | ||
207 | { 0, 0, 0}, /* 0: black */ | ||
208 | {255, 255, 255}, /* 1: white */ | ||
209 | {173, 132, 57}, /* 2: tan */ | ||
210 | { 64, 132, 0}, /* 3: medium green */ | ||
211 | {189, 117, 1}, /* 4: gold */ | ||
212 | {253, 249, 1}, /* 5: yellow */ | ||
213 | { 0, 0, 255}, /* 6: blue */ | ||
214 | { 0, 0, 120}, /* 7: medium blue */ | ||
215 | {255, 0, 255}, /* 8: magenta */ | ||
216 | { 64, 0, 64}, /* 9: dark magenta */ | ||
217 | {255, 0, 0}, /* 10: red */ | ||
218 | { 64, 0, 0}, /* 11: dark red */ | ||
219 | {255, 127, 0}, /* 12: orange */ | ||
220 | {192, 96, 0}, /* 13: darker orange */ | ||
221 | { 24, 60, 0}, /* 14: dark green-yellow */ | ||
222 | { 85, 125, 200}, /* 15: ice blue */ | ||
223 | {192, 192, 192} /* 16: Netscape/Mosaic gray */ | ||
224 | }; | ||
225 | /* not used for now, but should be for error-checking: | ||
226 | static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color); | ||
227 | */ | ||
228 | |||
229 | /* | ||
230 | This whole struct is a fairly cheesy way to keep the number of | ||
231 | command-line options to a minimum. The radial-waves background | ||
232 | type is a particularly poor fit to the integer elements of the | ||
233 | struct...but a few macros and a little fixed-point math will do | ||
234 | wonders for ya. | ||
235 | |||
236 | type bits: | ||
237 | F E D C B A 9 8 7 6 5 4 3 2 1 0 | ||
238 | | | | | | | ||
239 | | | +-+-+-- 0 = sharp-edged checkerboard | ||
240 | | | 1 = soft diamonds | ||
241 | | | 2 = radial waves | ||
242 | | | 3-7 = undefined | ||
243 | | +-- gradient #2 inverted? | ||
244 | +-- alternating columns inverted? | ||
245 | */ | ||
246 | static struct background_pattern { | ||
247 | ush type; | ||
248 | int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */ | ||
249 | int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/ | ||
250 | } bg[] = { | ||
251 | {0, 1,1, 16,16}, /* checkered: white vs. light gray (basic) */ | ||
252 | {0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */ | ||
253 | {0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */ | ||
254 | {0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */ | ||
255 | {0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */ | ||
256 | {0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */ | ||
257 | {0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */ | ||
258 | {0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */ | ||
259 | {1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */ | ||
260 | {1, 12,0, 11,0}, /* diamonds: orange vs. dark red */ | ||
261 | {1, 10,0, 7,0}, /* diamonds: red vs. medium blue */ | ||
262 | {1, 4,0, 5,0}, /* diamonds: gold vs. yellow */ | ||
263 | {1, 3,0, 0,0}, /* diamonds: medium green vs. black */ | ||
264 | {2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */ | ||
265 | {2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */ | ||
266 | {2, 16, 256, 100, 250}, /* radial: very tight spiral */ | ||
267 | {2, 10000, 256, 11, 0} /* radial: dipole-moire' (almost fractal) */ | ||
268 | }; | ||
269 | static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern); | ||
270 | |||
271 | |||
272 | /* X-specific variables */ | ||
273 | static char *displayname; | ||
274 | static XImage *ximage; | ||
275 | static Display *display; | ||
276 | static int depth; | ||
277 | static Visual *visual; | ||
278 | static XVisualInfo *visual_list; | ||
279 | static int RShift, GShift, BShift; | ||
280 | static ulg RMask, GMask, BMask; | ||
281 | static Window window; | ||
282 | static GC gc; | ||
283 | static Colormap colormap; | ||
284 | |||
285 | static int have_nondefault_visual = FALSE; | ||
286 | static int have_colormap = FALSE; | ||
287 | static int have_window = FALSE; | ||
288 | static int have_gc = FALSE; | ||
289 | |||
290 | |||
291 | |||
292 | |||
293 | int main(int argc, char **argv) | ||
294 | { | ||
295 | #ifdef sgi | ||
296 | char tmpline[80]; | ||
297 | #endif | ||
298 | char *p, *bgstr = NULL; | ||
299 | int rc, alen, flen; | ||
300 | int error = 0; | ||
301 | int timing = FALSE; | ||
302 | int have_bg = FALSE; | ||
303 | #ifdef FEATURE_LOOP | ||
304 | int loop = FALSE; | ||
305 | long loop_interval = -1; /* seconds (100,000 max) */ | ||
306 | #endif | ||
307 | double LUT_exponent; /* just the lookup table */ | ||
308 | double CRT_exponent = 2.2; /* just the monitor */ | ||
309 | double default_display_exponent; /* whole display system */ | ||
310 | XEvent e; | ||
311 | KeySym k; | ||
312 | |||
313 | |||
314 | /* First initialize a few things, just to be sure--memset takes care of | ||
315 | * default background color (black), booleans (FALSE), pointers (NULL), | ||
316 | * etc. */ | ||
317 | |||
318 | displayname = (char *)NULL; | ||
319 | filename = (char *)NULL; | ||
320 | memset(&rpng2_info, 0, sizeof(mainprog_info)); | ||
321 | |||
322 | |||
323 | /* Set the default value for our display-system exponent, i.e., the | ||
324 | * product of the CRT exponent and the exponent corresponding to | ||
325 | * the frame-buffer's lookup table (LUT), if any. This is not an | ||
326 | * exhaustive list of LUT values (e.g., OpenStep has a lot of weird | ||
327 | * ones), but it should cover 99% of the current possibilities. */ | ||
328 | |||
329 | #if defined(NeXT) | ||
330 | /* third-party utilities can modify the default LUT exponent */ | ||
331 | LUT_exponent = 1.0 / 2.2; | ||
332 | /* | ||
333 | if (some_next_function_that_returns_gamma(&next_gamma)) | ||
334 | LUT_exponent = 1.0 / next_gamma; | ||
335 | */ | ||
336 | #elif defined(sgi) | ||
337 | LUT_exponent = 1.0 / 1.7; | ||
338 | /* there doesn't seem to be any documented function to | ||
339 | * get the "gamma" value, so we do it the hard way */ | ||
340 | infile = fopen("/etc/config/system.glGammaVal", "r"); | ||
341 | if (infile) { | ||
342 | double sgi_gamma; | ||
343 | |||
344 | fgets(tmpline, 80, infile); | ||
345 | fclose(infile); | ||
346 | sgi_gamma = atof(tmpline); | ||
347 | if (sgi_gamma > 0.0) | ||
348 | LUT_exponent = 1.0 / sgi_gamma; | ||
349 | } | ||
350 | #elif defined(Macintosh) | ||
351 | LUT_exponent = 1.8 / 2.61; | ||
352 | /* | ||
353 | if (some_mac_function_that_returns_gamma(&mac_gamma)) | ||
354 | LUT_exponent = mac_gamma / 2.61; | ||
355 | */ | ||
356 | #else | ||
357 | LUT_exponent = 1.0; /* assume no LUT: most PCs */ | ||
358 | #endif | ||
359 | |||
360 | /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */ | ||
361 | default_display_exponent = LUT_exponent * CRT_exponent; | ||
362 | |||
363 | |||
364 | /* If the user has set the SCREEN_GAMMA environment variable as suggested | ||
365 | * (somewhat imprecisely) in the libpng documentation, use that; otherwise | ||
366 | * use the default value we just calculated. Either way, the user may | ||
367 | * override this via a command-line option. */ | ||
368 | |||
369 | if ((p = getenv("SCREEN_GAMMA")) != NULL) | ||
370 | rpng2_info.display_exponent = atof(p); | ||
371 | else | ||
372 | rpng2_info.display_exponent = default_display_exponent; | ||
373 | |||
374 | |||
375 | /* Now parse the command line for options and the PNG filename. */ | ||
376 | |||
377 | while (*++argv && !error) { | ||
378 | if (!strncmp(*argv, "-display", 2)) { | ||
379 | if (!*++argv) | ||
380 | ++error; | ||
381 | else | ||
382 | displayname = *argv; | ||
383 | } else if (!strncmp(*argv, "-gamma", 2)) { | ||
384 | if (!*++argv) | ||
385 | ++error; | ||
386 | else { | ||
387 | rpng2_info.display_exponent = atof(*argv); | ||
388 | if (rpng2_info.display_exponent <= 0.0) | ||
389 | ++error; | ||
390 | } | ||
391 | } else if (!strncmp(*argv, "-bgcolor", 4)) { | ||
392 | if (!*++argv) | ||
393 | ++error; | ||
394 | else { | ||
395 | bgstr = *argv; | ||
396 | if (strlen(bgstr) != 7 || bgstr[0] != '#') | ||
397 | ++error; | ||
398 | else { | ||
399 | have_bg = TRUE; | ||
400 | bg_image = FALSE; | ||
401 | } | ||
402 | } | ||
403 | } else if (!strncmp(*argv, "-bgpat", 4)) { | ||
404 | if (!*++argv) | ||
405 | ++error; | ||
406 | else { | ||
407 | pat = atoi(*argv); | ||
408 | if (pat >= 0 && pat < num_bgpat) { | ||
409 | bg_image = TRUE; | ||
410 | have_bg = FALSE; | ||
411 | } else | ||
412 | ++error; | ||
413 | } | ||
414 | } else if (!strncmp(*argv, "-usleep", 2)) { | ||
415 | if (!*++argv) | ||
416 | ++error; | ||
417 | else { | ||
418 | usleep_duration = (ulg)atol(*argv); | ||
419 | demo_timing = TRUE; | ||
420 | } | ||
421 | } else if (!strncmp(*argv, "-pause", 2)) { | ||
422 | pause_after_pass = TRUE; | ||
423 | } else if (!strncmp(*argv, "-timing", 2)) { | ||
424 | timing = TRUE; | ||
425 | #ifdef FEATURE_LOOP | ||
426 | } else if (!strncmp(*argv, "-loop", 2)) { | ||
427 | loop = TRUE; | ||
428 | if (!argv[1] || !is_number(argv[1])) | ||
429 | loop_interval = 2; | ||
430 | else { | ||
431 | ++argv; | ||
432 | loop_interval = atol(*argv); | ||
433 | if (loop_interval < 0) | ||
434 | loop_interval = 2; | ||
435 | else if (loop_interval > 100000) /* bit more than one day */ | ||
436 | loop_interval = 100000; | ||
437 | } | ||
438 | #endif | ||
439 | } else { | ||
440 | if (**argv != '-') { | ||
441 | filename = *argv; | ||
442 | if (argv[1]) /* shouldn't be any more args after filename */ | ||
443 | ++error; | ||
444 | } else | ||
445 | ++error; /* not expecting any other options */ | ||
446 | } | ||
447 | } | ||
448 | |||
449 | if (!filename) | ||
450 | ++error; | ||
451 | |||
452 | |||
453 | /* print usage screen if any errors up to this point */ | ||
454 | |||
455 | if (error) { | ||
456 | fprintf(stderr, "\n%s %s: %s\n\n", PROGNAME, VERSION, appname); | ||
457 | readpng2_version_info(); | ||
458 | fprintf(stderr, "\n" | ||
459 | "Usage: %s [-display xdpy] [-gamma exp] [-bgcolor bg | -bgpat pat]\n" | ||
460 | #ifdef FEATURE_LOOP | ||
461 | " %*s [-usleep dur | -timing] [-pause] [-loop [sec]] file.png\n\n" | ||
462 | #else | ||
463 | " %*s [-usleep dur | -timing] [-pause] file.png\n\n" | ||
464 | #endif | ||
465 | " xdpy\tname of the target X display (e.g., ``hostname:0'')\n" | ||
466 | " exp \ttransfer-function exponent (``gamma'') of the display\n" | ||
467 | "\t\t system in floating-point format (e.g., ``%.1f''); equal\n" | ||
468 | "\t\t to the product of the lookup-table exponent (varies)\n" | ||
469 | "\t\t and the CRT exponent (usually 2.2); must be positive\n" | ||
470 | " bg \tdesired background color in 7-character hex RGB format\n" | ||
471 | "\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n" | ||
472 | "\t\t used with transparent images; overrides -bgpat\n" | ||
473 | " pat \tdesired background pattern number (0-%d); used with\n" | ||
474 | "\t\t transparent images; overrides -bgcolor\n" | ||
475 | #ifdef FEATURE_LOOP | ||
476 | " -loop\tloops through background images after initial display\n" | ||
477 | "\t\t is complete (depends on -bgpat)\n" | ||
478 | " sec \tseconds to display each background image (default = 2)\n" | ||
479 | #endif | ||
480 | " dur \tduration in microseconds to wait after displaying each\n" | ||
481 | "\t\t row (for demo purposes)\n" | ||
482 | " -timing\tenables delay for every block read, to simulate modem\n" | ||
483 | "\t\t download of image (~36 Kbps)\n" | ||
484 | " -pause\tpauses after displaying each pass until mouse clicked\n" | ||
485 | "\nPress Q, Esc or mouse button 1 (within image window, after image\n" | ||
486 | "is displayed) to quit.\n" | ||
487 | "\n", PROGNAME, | ||
488 | (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat-1); | ||
489 | exit(1); | ||
490 | } | ||
491 | |||
492 | |||
493 | if (!(infile = fopen(filename, "rb"))) { | ||
494 | fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename); | ||
495 | ++error; | ||
496 | } else { | ||
497 | incount = fread(inbuf, 1, INBUFSIZE, infile); | ||
498 | if (incount < 8 || !readpng2_check_sig(inbuf, 8)) { | ||
499 | fprintf(stderr, PROGNAME | ||
500 | ": [%s] is not a PNG file: incorrect signature\n", | ||
501 | filename); | ||
502 | ++error; | ||
503 | } else if ((rc = readpng2_init(&rpng2_info)) != 0) { | ||
504 | switch (rc) { | ||
505 | case 2: | ||
506 | fprintf(stderr, PROGNAME | ||
507 | ": [%s] has bad IHDR (libpng longjmp)\n", filename); | ||
508 | break; | ||
509 | case 4: | ||
510 | fprintf(stderr, PROGNAME ": insufficient memory\n"); | ||
511 | break; | ||
512 | default: | ||
513 | fprintf(stderr, PROGNAME | ||
514 | ": unknown readpng2_init() error\n"); | ||
515 | break; | ||
516 | } | ||
517 | ++error; | ||
518 | } else { | ||
519 | Trace((stderr, "about to call XOpenDisplay()\n")) | ||
520 | display = XOpenDisplay(displayname); | ||
521 | if (!display) { | ||
522 | readpng2_cleanup(&rpng2_info); | ||
523 | fprintf(stderr, PROGNAME ": can't open X display [%s]\n", | ||
524 | displayname? displayname : "default"); | ||
525 | ++error; | ||
526 | } | ||
527 | } | ||
528 | if (error) | ||
529 | fclose(infile); | ||
530 | } | ||
531 | |||
532 | |||
533 | if (error) { | ||
534 | fprintf(stderr, PROGNAME ": aborting.\n"); | ||
535 | exit(2); | ||
536 | } | ||
537 | |||
538 | |||
539 | /* set the title-bar string, but make sure buffer doesn't overflow */ | ||
540 | |||
541 | alen = strlen(appname); | ||
542 | flen = strlen(filename); | ||
543 | if (alen + flen + 3 > 1023) | ||
544 | sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023)); | ||
545 | else | ||
546 | sprintf(titlebar, "%s: %s", appname, filename); | ||
547 | |||
548 | |||
549 | /* set some final rpng2_info variables before entering main data loop */ | ||
550 | |||
551 | if (have_bg) { | ||
552 | unsigned r, g, b; /* this approach quiets compiler warnings */ | ||
553 | |||
554 | sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b); | ||
555 | rpng2_info.bg_red = (uch)r; | ||
556 | rpng2_info.bg_green = (uch)g; | ||
557 | rpng2_info.bg_blue = (uch)b; | ||
558 | } else | ||
559 | rpng2_info.need_bgcolor = TRUE; | ||
560 | |||
561 | rpng2_info.state = kPreInit; | ||
562 | rpng2_info.mainprog_init = rpng2_x_init; | ||
563 | rpng2_info.mainprog_display_row = rpng2_x_display_row; | ||
564 | rpng2_info.mainprog_finish_display = rpng2_x_finish_display; | ||
565 | |||
566 | |||
567 | /* OK, this is the fun part: call readpng2_decode_data() at the start of | ||
568 | * the loop to deal with our first buffer of data (read in above to verify | ||
569 | * that the file is a PNG image), then loop through the file and continue | ||
570 | * calling the same routine to handle each chunk of data. It in turn | ||
571 | * passes the data to libpng, which will invoke one or more of our call- | ||
572 | * backs as decoded data become available. We optionally call sleep() for | ||
573 | * one second per iteration to simulate downloading the image via an analog | ||
574 | * modem. */ | ||
575 | |||
576 | for (;;) { | ||
577 | Trace((stderr, "about to call readpng2_decode_data()\n")) | ||
578 | if (readpng2_decode_data(&rpng2_info, inbuf, incount)) | ||
579 | ++error; | ||
580 | Trace((stderr, "done with readpng2_decode_data()\n")) | ||
581 | |||
582 | if (error || incount != INBUFSIZE || rpng2_info.state == kDone) { | ||
583 | if (rpng2_info.state == kDone) { | ||
584 | Trace((stderr, "done decoding PNG image\n")) | ||
585 | } else if (ferror(infile)) { | ||
586 | fprintf(stderr, PROGNAME | ||
587 | ": error while reading PNG image file\n"); | ||
588 | exit(3); | ||
589 | } else if (feof(infile)) { | ||
590 | fprintf(stderr, PROGNAME ": end of file reached " | ||
591 | "(unexpectedly) while reading PNG image file\n"); | ||
592 | exit(3); | ||
593 | } else /* if (error) */ { | ||
594 | /* will print error message below */ | ||
595 | } | ||
596 | break; | ||
597 | } | ||
598 | |||
599 | if (timing) | ||
600 | sleep(1); | ||
601 | |||
602 | incount = fread(inbuf, 1, INBUFSIZE, infile); | ||
603 | } | ||
604 | |||
605 | |||
606 | /* clean up PNG stuff and report any decoding errors */ | ||
607 | |||
608 | fclose(infile); | ||
609 | Trace((stderr, "about to call readpng2_cleanup()\n")) | ||
610 | readpng2_cleanup(&rpng2_info); | ||
611 | |||
612 | if (error) { | ||
613 | fprintf(stderr, PROGNAME ": libpng error while decoding PNG image\n"); | ||
614 | exit(3); | ||
615 | } | ||
616 | |||
617 | |||
618 | #ifdef FEATURE_LOOP | ||
619 | |||
620 | if (loop && bg_image) { | ||
621 | Trace((stderr, "entering -loop loop (FEATURE_LOOP)\n")) | ||
622 | for (;;) { | ||
623 | int i, use_sleep; | ||
624 | struct timeval now, then; | ||
625 | |||
626 | /* get current time and add loop_interval to get target time */ | ||
627 | if (gettimeofday(&then, NULL) == 0) { | ||
628 | then.tv_sec += loop_interval; | ||
629 | use_sleep = FALSE; | ||
630 | } else | ||
631 | use_sleep = TRUE; | ||
632 | |||
633 | /* do quick check for a quit event but don't wait for it */ | ||
634 | /* GRR BUG: should also check for Expose events and redraw... */ | ||
635 | if (XCheckMaskEvent(display, KeyPressMask | ButtonPressMask, &e)) | ||
636 | if (QUIT(e,k)) | ||
637 | break; | ||
638 | |||
639 | /* generate next background image */ | ||
640 | if (++pat >= num_bgpat) | ||
641 | pat = 0; | ||
642 | rpng2_x_reload_bg_image(); | ||
643 | |||
644 | /* wait for timeout, using whatever means are available */ | ||
645 | if (use_sleep || gettimeofday(&now, NULL) != 0) { | ||
646 | for (i = loop_interval; i > 0; --i) { | ||
647 | sleep(1); | ||
648 | /* GRR BUG: also need to check for Expose (and redraw!) */ | ||
649 | if (XCheckMaskEvent(display, KeyPressMask | ButtonPressMask, | ||
650 | &e) && QUIT(e,k)) | ||
651 | break; | ||
652 | } | ||
653 | } else { | ||
654 | /* Y2038 BUG! */ | ||
655 | if (now.tv_sec < then.tv_sec || | ||
656 | (now.tv_sec == then.tv_sec && now.tv_usec < then.tv_usec)) | ||
657 | { | ||
658 | int quit = FALSE; | ||
659 | long seconds_to_go = then.tv_sec - now.tv_sec; | ||
660 | long usleep_usec; | ||
661 | |||
662 | /* basically chew up most of remaining loop-interval with | ||
663 | * calls to sleep(1) interleaved with checks for quit | ||
664 | * events, but also recalc time-to-go periodically; when | ||
665 | * done, clean up any remaining time with usleep() call | ||
666 | * (could also use SIGALRM, but signals are a pain...) */ | ||
667 | while (seconds_to_go-- > 1) { | ||
668 | int seconds_done = 0; | ||
669 | |||
670 | for (i = seconds_to_go; i > 0 && !quit; --i) { | ||
671 | sleep(1); | ||
672 | /* GRR BUG: need to check for Expose and redraw */ | ||
673 | if (XCheckMaskEvent(display, KeyPressMask | | ||
674 | ButtonPressMask, &e) && QUIT(e,k)) | ||
675 | quit = TRUE; | ||
676 | if (++seconds_done > 1000) | ||
677 | break; /* time to redo seconds_to_go meas. */ | ||
678 | } | ||
679 | if (quit) | ||
680 | break; | ||
681 | |||
682 | /* OK, more than 1000 seconds since last check: | ||
683 | * correct the time-to-go measurement for drift */ | ||
684 | if (gettimeofday(&now, NULL) == 0) { | ||
685 | if (now.tv_sec >= then.tv_sec) | ||
686 | break; | ||
687 | seconds_to_go = then.tv_sec - now.tv_sec; | ||
688 | } else | ||
689 | ++seconds_to_go; /* restore what we subtracted */ | ||
690 | } | ||
691 | if (quit) | ||
692 | break; /* breaks outer do-loop, skips redisplay */ | ||
693 | |||
694 | /* since difference between "now" and "then" is already | ||
695 | * eaten up to within a couple of seconds, don't need to | ||
696 | * worry about overflow--but might have overshot (neg.) */ | ||
697 | if (gettimeofday(&now, NULL) == 0) { | ||
698 | usleep_usec = 1000000L*(then.tv_sec - now.tv_sec) + | ||
699 | then.tv_usec - now.tv_usec; | ||
700 | if (usleep_usec > 0) | ||
701 | usleep((ulg)usleep_usec); | ||
702 | } | ||
703 | } | ||
704 | } | ||
705 | |||
706 | /* composite image against new background and display (note that | ||
707 | * we do not take into account the time spent doing this...) */ | ||
708 | rpng2_x_redisplay_image (0, 0, rpng2_info.width, rpng2_info.height); | ||
709 | } | ||
710 | |||
711 | } else /* FALL THROUGH and do the normal thing */ | ||
712 | |||
713 | #endif /* FEATURE_LOOP */ | ||
714 | |||
715 | /* wait for the user to tell us when to quit */ | ||
716 | |||
717 | if (rpng2_info.state >= kWindowInit) { | ||
718 | Trace((stderr, "entering final wait-for-quit-event loop\n")) | ||
719 | do { | ||
720 | XNextEvent(display, &e); | ||
721 | if (e.type == Expose) { | ||
722 | XExposeEvent *ex = (XExposeEvent *)&e; | ||
723 | rpng2_x_redisplay_image (ex->x, ex->y, ex->width, ex->height); | ||
724 | } | ||
725 | } while (!QUIT(e,k)); | ||
726 | } else { | ||
727 | fprintf(stderr, PROGNAME ": init callback never called: probable " | ||
728 | "libpng error while decoding PNG metadata\n"); | ||
729 | exit(4); | ||
730 | } | ||
731 | |||
732 | |||
733 | /* we're done: clean up all image and X resources and go away */ | ||
734 | |||
735 | Trace((stderr, "about to call rpng2_x_cleanup()\n")) | ||
736 | rpng2_x_cleanup(); | ||
737 | |||
738 | return 0; | ||
739 | } | ||
740 | |||
741 | |||
742 | |||
743 | |||
744 | |||
745 | /* this function is called by readpng2_info_callback() in readpng2.c, which | ||
746 | * in turn is called by libpng after all of the pre-IDAT chunks have been | ||
747 | * read and processed--i.e., we now have enough info to finish initializing */ | ||
748 | |||
749 | static void rpng2_x_init(void) | ||
750 | { | ||
751 | ulg i; | ||
752 | ulg rowbytes = rpng2_info.rowbytes; | ||
753 | |||
754 | Trace((stderr, "beginning rpng2_x_init()\n")) | ||
755 | Trace((stderr, " rowbytes = %d\n", rpng2_info.rowbytes)) | ||
756 | Trace((stderr, " width = %ld\n", rpng2_info.width)) | ||
757 | Trace((stderr, " height = %ld\n", rpng2_info.height)) | ||
758 | |||
759 | rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height); | ||
760 | if (!rpng2_info.image_data) { | ||
761 | readpng2_cleanup(&rpng2_info); | ||
762 | return; | ||
763 | } | ||
764 | |||
765 | rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *)); | ||
766 | if (!rpng2_info.row_pointers) { | ||
767 | free(rpng2_info.image_data); | ||
768 | rpng2_info.image_data = NULL; | ||
769 | readpng2_cleanup(&rpng2_info); | ||
770 | return; | ||
771 | } | ||
772 | |||
773 | for (i = 0; i < rpng2_info.height; ++i) | ||
774 | rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes; | ||
775 | |||
776 | |||
777 | /* do the basic X initialization stuff, make the window, and fill it with | ||
778 | * the user-specified, file-specified or default background color or | ||
779 | * pattern */ | ||
780 | |||
781 | if (rpng2_x_create_window()) { | ||
782 | |||
783 | /* GRR TEMPORARY HACK: this is fundamentally no different from cases | ||
784 | * above; libpng should call our error handler to longjmp() back to us | ||
785 | * when png_ptr goes away. If we/it segfault instead, seems like a | ||
786 | * libpng bug... */ | ||
787 | |||
788 | /* we're here via libpng callback, so if window fails, clean and bail */ | ||
789 | readpng2_cleanup(&rpng2_info); | ||
790 | rpng2_x_cleanup(); | ||
791 | exit(2); | ||
792 | } | ||
793 | |||
794 | rpng2_info.state = kWindowInit; | ||
795 | } | ||
796 | |||
797 | |||
798 | |||
799 | |||
800 | |||
801 | static int rpng2_x_create_window(void) | ||
802 | { | ||
803 | ulg bg_red = rpng2_info.bg_red; | ||
804 | ulg bg_green = rpng2_info.bg_green; | ||
805 | ulg bg_blue = rpng2_info.bg_blue; | ||
806 | ulg bg_pixel = 0L; | ||
807 | ulg attrmask; | ||
808 | int need_colormap = FALSE; | ||
809 | int screen, pad; | ||
810 | uch *xdata; | ||
811 | Window root; | ||
812 | XEvent e; | ||
813 | XGCValues gcvalues; | ||
814 | XSetWindowAttributes attr; | ||
815 | XTextProperty windowName, *pWindowName = &windowName; | ||
816 | XTextProperty iconName, *pIconName = &iconName; | ||
817 | XVisualInfo visual_info; | ||
818 | XSizeHints *size_hints; | ||
819 | XWMHints *wm_hints; | ||
820 | XClassHint *class_hints; | ||
821 | |||
822 | |||
823 | Trace((stderr, "beginning rpng2_x_create_window()\n")) | ||
824 | |||
825 | screen = DefaultScreen(display); | ||
826 | depth = DisplayPlanes(display, screen); | ||
827 | root = RootWindow(display, screen); | ||
828 | |||
829 | #ifdef DEBUG | ||
830 | XSynchronize(display, True); | ||
831 | #endif | ||
832 | |||
833 | if (depth != 16 && depth != 24 && depth != 32) { | ||
834 | int visuals_matched = 0; | ||
835 | |||
836 | Trace((stderr, "default depth is %d: checking other visuals\n", | ||
837 | depth)) | ||
838 | |||
839 | /* 24-bit first */ | ||
840 | visual_info.screen = screen; | ||
841 | visual_info.depth = 24; | ||
842 | visual_list = XGetVisualInfo(display, | ||
843 | VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched); | ||
844 | if (visuals_matched == 0) { | ||
845 | /* GRR: add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */ | ||
846 | fprintf(stderr, "default screen depth %d not supported, and no" | ||
847 | " 24-bit visuals found\n", depth); | ||
848 | return 2; | ||
849 | } | ||
850 | Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n", | ||
851 | visuals_matched)) | ||
852 | visual = visual_list[0].visual; | ||
853 | depth = visual_list[0].depth; | ||
854 | /* | ||
855 | colormap_size = visual_list[0].colormap_size; | ||
856 | visual_class = visual->class; | ||
857 | visualID = XVisualIDFromVisual(visual); | ||
858 | */ | ||
859 | have_nondefault_visual = TRUE; | ||
860 | need_colormap = TRUE; | ||
861 | } else { | ||
862 | XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info); | ||
863 | visual = visual_info.visual; | ||
864 | } | ||
865 | |||
866 | RMask = visual->red_mask; | ||
867 | GMask = visual->green_mask; | ||
868 | BMask = visual->blue_mask; | ||
869 | |||
870 | /* GRR: add/check 8-bit support */ | ||
871 | if (depth == 8 || need_colormap) { | ||
872 | colormap = XCreateColormap(display, root, visual, AllocNone); | ||
873 | if (!colormap) { | ||
874 | fprintf(stderr, "XCreateColormap() failed\n"); | ||
875 | return 2; | ||
876 | } | ||
877 | have_colormap = TRUE; | ||
878 | if (depth == 8) | ||
879 | bg_image = FALSE; /* gradient just wastes palette entries */ | ||
880 | } | ||
881 | if (depth == 15 || depth == 16) { | ||
882 | RShift = 15 - rpng2_x_msb(RMask); /* these are right-shifts */ | ||
883 | GShift = 15 - rpng2_x_msb(GMask); | ||
884 | BShift = 15 - rpng2_x_msb(BMask); | ||
885 | } else if (depth > 16) { | ||
886 | RShift = rpng2_x_msb(RMask) - 7; /* these are left-shifts */ | ||
887 | GShift = rpng2_x_msb(GMask) - 7; | ||
888 | BShift = rpng2_x_msb(BMask) - 7; | ||
889 | } | ||
890 | if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) { | ||
891 | fprintf(stderr, "rpng2 internal logic error: negative X shift(s)!\n"); | ||
892 | return 2; | ||
893 | } | ||
894 | |||
895 | /*--------------------------------------------------------------------------- | ||
896 | Finally, create the window. | ||
897 | ---------------------------------------------------------------------------*/ | ||
898 | |||
899 | attr.backing_store = Always; | ||
900 | attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask; | ||
901 | attrmask = CWBackingStore | CWEventMask; | ||
902 | if (have_nondefault_visual) { | ||
903 | attr.colormap = colormap; | ||
904 | attr.background_pixel = 0; | ||
905 | attr.border_pixel = 1; | ||
906 | attrmask |= CWColormap | CWBackPixel | CWBorderPixel; | ||
907 | } | ||
908 | |||
909 | window = XCreateWindow(display, root, 0, 0, rpng2_info.width, | ||
910 | rpng2_info.height, 0, depth, InputOutput, visual, attrmask, &attr); | ||
911 | |||
912 | if (window == None) { | ||
913 | fprintf(stderr, "XCreateWindow() failed\n"); | ||
914 | return 2; | ||
915 | } else | ||
916 | have_window = TRUE; | ||
917 | |||
918 | if (depth == 8) | ||
919 | XSetWindowColormap(display, window, colormap); | ||
920 | |||
921 | if (!XStringListToTextProperty(&window_name, 1, pWindowName)) | ||
922 | pWindowName = NULL; | ||
923 | if (!XStringListToTextProperty(&icon_name, 1, pIconName)) | ||
924 | pIconName = NULL; | ||
925 | |||
926 | /* OK if either hints allocation fails; XSetWMProperties() allows NULLs */ | ||
927 | |||
928 | if ((size_hints = XAllocSizeHints()) != NULL) { | ||
929 | /* window will not be resizable */ | ||
930 | size_hints->flags = PMinSize | PMaxSize; | ||
931 | size_hints->min_width = size_hints->max_width = (int)rpng2_info.width; | ||
932 | size_hints->min_height = size_hints->max_height = | ||
933 | (int)rpng2_info.height; | ||
934 | } | ||
935 | |||
936 | if ((wm_hints = XAllocWMHints()) != NULL) { | ||
937 | wm_hints->initial_state = NormalState; | ||
938 | wm_hints->input = True; | ||
939 | /* wm_hints->icon_pixmap = icon_pixmap; */ | ||
940 | wm_hints->flags = StateHint | InputHint /* | IconPixmapHint */ ; | ||
941 | } | ||
942 | |||
943 | if ((class_hints = XAllocClassHint()) != NULL) { | ||
944 | class_hints->res_name = res_name; | ||
945 | class_hints->res_class = res_class; | ||
946 | } | ||
947 | |||
948 | XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0, | ||
949 | size_hints, wm_hints, class_hints); | ||
950 | |||
951 | /* various properties and hints no longer needed; free memory */ | ||
952 | if (pWindowName) | ||
953 | XFree(pWindowName->value); | ||
954 | if (pIconName) | ||
955 | XFree(pIconName->value); | ||
956 | if (size_hints) | ||
957 | XFree(size_hints); | ||
958 | if (wm_hints) | ||
959 | XFree(wm_hints); | ||
960 | if (class_hints) | ||
961 | XFree(class_hints); | ||
962 | |||
963 | XMapWindow(display, window); | ||
964 | |||
965 | gc = XCreateGC(display, window, 0, &gcvalues); | ||
966 | have_gc = TRUE; | ||
967 | |||
968 | /*--------------------------------------------------------------------------- | ||
969 | Allocate memory for the X- and display-specific version of the image. | ||
970 | ---------------------------------------------------------------------------*/ | ||
971 | |||
972 | if (depth == 24 || depth == 32) { | ||
973 | xdata = (uch *)malloc(4*rpng2_info.width*rpng2_info.height); | ||
974 | pad = 32; | ||
975 | } else if (depth == 16) { | ||
976 | xdata = (uch *)malloc(2*rpng2_info.width*rpng2_info.height); | ||
977 | pad = 16; | ||
978 | } else /* depth == 8 */ { | ||
979 | xdata = (uch *)malloc(rpng2_info.width*rpng2_info.height); | ||
980 | pad = 8; | ||
981 | } | ||
982 | |||
983 | if (!xdata) { | ||
984 | fprintf(stderr, PROGNAME ": unable to allocate image memory\n"); | ||
985 | return 4; | ||
986 | } | ||
987 | |||
988 | ximage = XCreateImage(display, visual, depth, ZPixmap, 0, | ||
989 | (char *)xdata, rpng2_info.width, rpng2_info.height, pad, 0); | ||
990 | |||
991 | if (!ximage) { | ||
992 | fprintf(stderr, PROGNAME ": XCreateImage() failed\n"); | ||
993 | free(xdata); | ||
994 | return 3; | ||
995 | } | ||
996 | |||
997 | /* to avoid testing the byte order every pixel (or doubling the size of | ||
998 | * the drawing routine with a giant if-test), we arbitrarily set the byte | ||
999 | * order to MSBFirst and let Xlib worry about inverting things on little- | ||
1000 | * endian machines (e.g., Linux/x86, old VAXen, etc.)--this is not the | ||
1001 | * most efficient approach (the giant if-test would be better), but in | ||
1002 | * the interest of clarity, we'll take the easy way out... */ | ||
1003 | |||
1004 | ximage->byte_order = MSBFirst; | ||
1005 | |||
1006 | /*--------------------------------------------------------------------------- | ||
1007 | Fill window with the specified background color (default is black) or | ||
1008 | faked "background image" (but latter is disabled if 8-bit; gradients | ||
1009 | just waste palette entries). | ||
1010 | ---------------------------------------------------------------------------*/ | ||
1011 | |||
1012 | if (bg_image) | ||
1013 | rpng2_x_load_bg_image(); /* resets bg_image if fails */ | ||
1014 | |||
1015 | if (!bg_image) { | ||
1016 | if (depth == 24 || depth == 32) { | ||
1017 | bg_pixel = (bg_red << RShift) | | ||
1018 | (bg_green << GShift) | | ||
1019 | (bg_blue << BShift); | ||
1020 | } else if (depth == 16) { | ||
1021 | bg_pixel = (((bg_red << 8) >> RShift) & RMask) | | ||
1022 | (((bg_green << 8) >> GShift) & GMask) | | ||
1023 | (((bg_blue << 8) >> BShift) & BMask); | ||
1024 | } else /* depth == 8 */ { | ||
1025 | |||
1026 | /* GRR: add 8-bit support */ | ||
1027 | |||
1028 | } | ||
1029 | XSetForeground(display, gc, bg_pixel); | ||
1030 | XFillRectangle(display, window, gc, 0, 0, rpng2_info.width, | ||
1031 | rpng2_info.height); | ||
1032 | } | ||
1033 | |||
1034 | /*--------------------------------------------------------------------------- | ||
1035 | Wait for first Expose event to do any drawing, then flush and return. | ||
1036 | ---------------------------------------------------------------------------*/ | ||
1037 | |||
1038 | do | ||
1039 | XNextEvent(display, &e); | ||
1040 | while (e.type != Expose || e.xexpose.count); | ||
1041 | |||
1042 | XFlush(display); | ||
1043 | |||
1044 | return 0; | ||
1045 | |||
1046 | } /* end function rpng2_x_create_window() */ | ||
1047 | |||
1048 | |||
1049 | |||
1050 | |||
1051 | |||
1052 | static int rpng2_x_load_bg_image(void) | ||
1053 | { | ||
1054 | uch *src; | ||
1055 | char *dest; | ||
1056 | uch r1, r2, g1, g2, b1, b2; | ||
1057 | uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv; | ||
1058 | int k, hmax, max; | ||
1059 | int xidx, yidx, yidx_max; | ||
1060 | int even_odd_vert, even_odd_horiz, even_odd; | ||
1061 | int invert_gradient2 = (bg[pat].type & 0x08); | ||
1062 | int invert_column; | ||
1063 | int ximage_rowbytes = ximage->bytes_per_line; | ||
1064 | ulg i, row; | ||
1065 | ulg pixel; | ||
1066 | |||
1067 | /*--------------------------------------------------------------------------- | ||
1068 | Allocate buffer for fake background image to be used with transparent | ||
1069 | images; if this fails, revert to plain background color. | ||
1070 | ---------------------------------------------------------------------------*/ | ||
1071 | |||
1072 | bg_rowbytes = 3 * rpng2_info.width; | ||
1073 | bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height); | ||
1074 | if (!bg_data) { | ||
1075 | fprintf(stderr, PROGNAME | ||
1076 | ": unable to allocate memory for background image\n"); | ||
1077 | bg_image = 0; | ||
1078 | return 1; | ||
1079 | } | ||
1080 | |||
1081 | bgscale = (pat == 0)? 8 : bgscale_default; | ||
1082 | yidx_max = bgscale - 1; | ||
1083 | |||
1084 | /*--------------------------------------------------------------------------- | ||
1085 | Vertical gradients (ramps) in NxN squares, alternating direction and | ||
1086 | colors (N == bgscale). | ||
1087 | ---------------------------------------------------------------------------*/ | ||
1088 | |||
1089 | if ((bg[pat].type & 0x07) == 0) { | ||
1090 | uch r1_min = rgb[bg[pat].rgb1_min].r; | ||
1091 | uch g1_min = rgb[bg[pat].rgb1_min].g; | ||
1092 | uch b1_min = rgb[bg[pat].rgb1_min].b; | ||
1093 | uch r2_min = rgb[bg[pat].rgb2_min].r; | ||
1094 | uch g2_min = rgb[bg[pat].rgb2_min].g; | ||
1095 | uch b2_min = rgb[bg[pat].rgb2_min].b; | ||
1096 | int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min; | ||
1097 | int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min; | ||
1098 | int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min; | ||
1099 | int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min; | ||
1100 | int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min; | ||
1101 | int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min; | ||
1102 | |||
1103 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1104 | yidx = (int)(row % bgscale); | ||
1105 | even_odd_vert = (int)((row / bgscale) & 1); | ||
1106 | |||
1107 | r1 = r1_min + (r1_diff * yidx) / yidx_max; | ||
1108 | g1 = g1_min + (g1_diff * yidx) / yidx_max; | ||
1109 | b1 = b1_min + (b1_diff * yidx) / yidx_max; | ||
1110 | r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max; | ||
1111 | g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max; | ||
1112 | b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max; | ||
1113 | |||
1114 | r2 = r2_min + (r2_diff * yidx) / yidx_max; | ||
1115 | g2 = g2_min + (g2_diff * yidx) / yidx_max; | ||
1116 | b2 = b2_min + (b2_diff * yidx) / yidx_max; | ||
1117 | r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max; | ||
1118 | g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max; | ||
1119 | b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max; | ||
1120 | |||
1121 | dest = (char *)bg_data + row*bg_rowbytes; | ||
1122 | for (i = 0; i < rpng2_info.width; ++i) { | ||
1123 | even_odd_horiz = (int)((i / bgscale) & 1); | ||
1124 | even_odd = even_odd_vert ^ even_odd_horiz; | ||
1125 | invert_column = | ||
1126 | (even_odd_horiz && (bg[pat].type & 0x10)); | ||
1127 | if (even_odd == 0) { /* gradient #1 */ | ||
1128 | if (invert_column) { | ||
1129 | *dest++ = r1_inv; | ||
1130 | *dest++ = g1_inv; | ||
1131 | *dest++ = b1_inv; | ||
1132 | } else { | ||
1133 | *dest++ = r1; | ||
1134 | *dest++ = g1; | ||
1135 | *dest++ = b1; | ||
1136 | } | ||
1137 | } else { /* gradient #2 */ | ||
1138 | if ((invert_column && invert_gradient2) || | ||
1139 | (!invert_column && !invert_gradient2)) | ||
1140 | { | ||
1141 | *dest++ = r2; /* not inverted or */ | ||
1142 | *dest++ = g2; /* doubly inverted */ | ||
1143 | *dest++ = b2; | ||
1144 | } else { | ||
1145 | *dest++ = r2_inv; | ||
1146 | *dest++ = g2_inv; /* singly inverted */ | ||
1147 | *dest++ = b2_inv; | ||
1148 | } | ||
1149 | } | ||
1150 | } | ||
1151 | } | ||
1152 | |||
1153 | /*--------------------------------------------------------------------------- | ||
1154 | Soft gradient-diamonds with scale = bgscale. Code contributed by Adam | ||
1155 | M. Costello. | ||
1156 | ---------------------------------------------------------------------------*/ | ||
1157 | |||
1158 | } else if ((bg[pat].type & 0x07) == 1) { | ||
1159 | |||
1160 | hmax = (bgscale-1)/2; /* half the max weight of a color */ | ||
1161 | max = 2*hmax; /* the max weight of a color */ | ||
1162 | |||
1163 | r1 = rgb[bg[pat].rgb1_max].r; | ||
1164 | g1 = rgb[bg[pat].rgb1_max].g; | ||
1165 | b1 = rgb[bg[pat].rgb1_max].b; | ||
1166 | r2 = rgb[bg[pat].rgb2_max].r; | ||
1167 | g2 = rgb[bg[pat].rgb2_max].g; | ||
1168 | b2 = rgb[bg[pat].rgb2_max].b; | ||
1169 | |||
1170 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1171 | yidx = (int)(row % bgscale); | ||
1172 | if (yidx > hmax) | ||
1173 | yidx = bgscale-1 - yidx; | ||
1174 | dest = (char *)bg_data + row*bg_rowbytes; | ||
1175 | for (i = 0; i < rpng2_info.width; ++i) { | ||
1176 | xidx = (int)(i % bgscale); | ||
1177 | if (xidx > hmax) | ||
1178 | xidx = bgscale-1 - xidx; | ||
1179 | k = xidx + yidx; | ||
1180 | *dest++ = (k*r1 + (max-k)*r2) / max; | ||
1181 | *dest++ = (k*g1 + (max-k)*g2) / max; | ||
1182 | *dest++ = (k*b1 + (max-k)*b2) / max; | ||
1183 | } | ||
1184 | } | ||
1185 | |||
1186 | /*--------------------------------------------------------------------------- | ||
1187 | Radial "starburst" with azimuthal sinusoids; [eventually number of sinu- | ||
1188 | soids will equal bgscale?]. This one is slow but very cool. Code con- | ||
1189 | tributed by Pieter S. van der Meulen (originally in Smalltalk). | ||
1190 | ---------------------------------------------------------------------------*/ | ||
1191 | |||
1192 | } else if ((bg[pat].type & 0x07) == 2) { | ||
1193 | uch ch; | ||
1194 | int ii, x, y, hw, hh, grayspot; | ||
1195 | double freq, rotate, saturate, gray, intensity; | ||
1196 | double angle=0.0, aoffset=0.0, maxDist, dist; | ||
1197 | double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t; | ||
1198 | |||
1199 | fprintf(stderr, "%s: computing radial background...", | ||
1200 | PROGNAME); | ||
1201 | fflush(stderr); | ||
1202 | |||
1203 | hh = (int)(rpng2_info.height / 2); | ||
1204 | hw = (int)(rpng2_info.width / 2); | ||
1205 | |||
1206 | /* variables for radial waves: | ||
1207 | * aoffset: number of degrees to rotate hue [CURRENTLY NOT USED] | ||
1208 | * freq: number of color beams originating from the center | ||
1209 | * grayspot: size of the graying center area (anti-alias) | ||
1210 | * rotate: rotation of the beams as a function of radius | ||
1211 | * saturate: saturation of beams' shape azimuthally | ||
1212 | */ | ||
1213 | angle = CLIP(angle, 0.0, 360.0); | ||
1214 | grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw)); | ||
1215 | freq = MAX((double)bg[pat].bg_freq, 0.0); | ||
1216 | saturate = (double)bg[pat].bg_bsat * 0.1; | ||
1217 | rotate = (double)bg[pat].bg_brot * 0.1; | ||
1218 | gray = 0.0; | ||
1219 | intensity = 0.0; | ||
1220 | maxDist = (double)((hw*hw) + (hh*hh)); | ||
1221 | |||
1222 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1223 | y = (int)(row - hh); | ||
1224 | dest = (char *)bg_data + row*bg_rowbytes; | ||
1225 | for (i = 0; i < rpng2_info.width; ++i) { | ||
1226 | x = (int)(i - hw); | ||
1227 | angle = (x == 0)? PI_2 : atan((double)y / (double)x); | ||
1228 | gray = (double)MAX(ABS(y), ABS(x)) / grayspot; | ||
1229 | gray = MIN(1.0, gray); | ||
1230 | dist = (double)((x*x) + (y*y)) / maxDist; | ||
1231 | intensity = cos((angle+(rotate*dist*PI)) * freq) * | ||
1232 | gray * saturate; | ||
1233 | intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5; | ||
1234 | hue = (angle + PI) * INV_PI_360 + aoffset; | ||
1235 | s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh)); | ||
1236 | s = MIN(MAX(s,0.0), 1.0); | ||
1237 | v = MIN(MAX(intensity,0.0), 1.0); | ||
1238 | |||
1239 | if (s == 0.0) { | ||
1240 | ch = (uch)(v * 255.0); | ||
1241 | *dest++ = ch; | ||
1242 | *dest++ = ch; | ||
1243 | *dest++ = ch; | ||
1244 | } else { | ||
1245 | if ((hue < 0.0) || (hue >= 360.0)) | ||
1246 | hue -= (((int)(hue / 360.0)) * 360.0); | ||
1247 | hue /= 60.0; | ||
1248 | ii = (int)hue; | ||
1249 | f = hue - (double)ii; | ||
1250 | p = (1.0 - s) * v; | ||
1251 | q = (1.0 - (s * f)) * v; | ||
1252 | t = (1.0 - (s * (1.0 - f))) * v; | ||
1253 | if (ii == 0) { red = v; green = t; blue = p; } | ||
1254 | else if (ii == 1) { red = q; green = v; blue = p; } | ||
1255 | else if (ii == 2) { red = p; green = v; blue = t; } | ||
1256 | else if (ii == 3) { red = p; green = q; blue = v; } | ||
1257 | else if (ii == 4) { red = t; green = p; blue = v; } | ||
1258 | else if (ii == 5) { red = v; green = p; blue = q; } | ||
1259 | *dest++ = (uch)(red * 255.0); | ||
1260 | *dest++ = (uch)(green * 255.0); | ||
1261 | *dest++ = (uch)(blue * 255.0); | ||
1262 | } | ||
1263 | } | ||
1264 | } | ||
1265 | fprintf(stderr, "done.\n"); | ||
1266 | fflush(stderr); | ||
1267 | } | ||
1268 | |||
1269 | /*--------------------------------------------------------------------------- | ||
1270 | Blast background image to display buffer before beginning PNG decode. | ||
1271 | ---------------------------------------------------------------------------*/ | ||
1272 | |||
1273 | if (depth == 24 || depth == 32) { | ||
1274 | ulg red, green, blue; | ||
1275 | int bpp = ximage->bits_per_pixel; | ||
1276 | |||
1277 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1278 | src = bg_data + row*bg_rowbytes; | ||
1279 | dest = ximage->data + row*ximage_rowbytes; | ||
1280 | if (bpp == 32) { /* slightly optimized version */ | ||
1281 | for (i = rpng2_info.width; i > 0; --i) { | ||
1282 | red = *src++; | ||
1283 | green = *src++; | ||
1284 | blue = *src++; | ||
1285 | pixel = (red << RShift) | | ||
1286 | (green << GShift) | | ||
1287 | (blue << BShift); | ||
1288 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1289 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
1290 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1291 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1292 | *dest++ = (char)( pixel & 0xff); | ||
1293 | } | ||
1294 | } else { | ||
1295 | for (i = rpng2_info.width; i > 0; --i) { | ||
1296 | red = *src++; | ||
1297 | green = *src++; | ||
1298 | blue = *src++; | ||
1299 | pixel = (red << RShift) | | ||
1300 | (green << GShift) | | ||
1301 | (blue << BShift); | ||
1302 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1303 | /* GRR BUG? this assumes bpp == 24 & bits are packed low */ | ||
1304 | /* (probably need to use RShift, RMask, etc.) */ | ||
1305 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1306 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1307 | *dest++ = (char)( pixel & 0xff); | ||
1308 | } | ||
1309 | } | ||
1310 | } | ||
1311 | |||
1312 | } else if (depth == 16) { | ||
1313 | ush red, green, blue; | ||
1314 | |||
1315 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1316 | src = bg_data + row*bg_rowbytes; | ||
1317 | dest = ximage->data + row*ximage_rowbytes; | ||
1318 | for (i = rpng2_info.width; i > 0; --i) { | ||
1319 | red = ((ush)(*src) << 8); ++src; | ||
1320 | green = ((ush)(*src) << 8); ++src; | ||
1321 | blue = ((ush)(*src) << 8); ++src; | ||
1322 | pixel = ((red >> RShift) & RMask) | | ||
1323 | ((green >> GShift) & GMask) | | ||
1324 | ((blue >> BShift) & BMask); | ||
1325 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1326 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1327 | *dest++ = (char)( pixel & 0xff); | ||
1328 | } | ||
1329 | } | ||
1330 | |||
1331 | } else /* depth == 8 */ { | ||
1332 | |||
1333 | /* GRR: add 8-bit support */ | ||
1334 | |||
1335 | } | ||
1336 | |||
1337 | XPutImage(display, window, gc, ximage, 0, 0, 0, 0, rpng2_info.width, | ||
1338 | rpng2_info.height); | ||
1339 | |||
1340 | return 0; | ||
1341 | |||
1342 | } /* end function rpng2_x_load_bg_image() */ | ||
1343 | |||
1344 | |||
1345 | |||
1346 | |||
1347 | |||
1348 | static void rpng2_x_display_row(ulg row) | ||
1349 | { | ||
1350 | uch bg_red = rpng2_info.bg_red; | ||
1351 | uch bg_green = rpng2_info.bg_green; | ||
1352 | uch bg_blue = rpng2_info.bg_blue; | ||
1353 | uch *src, *src2=NULL; | ||
1354 | char *dest; | ||
1355 | uch r, g, b, a; | ||
1356 | int ximage_rowbytes = ximage->bytes_per_line; | ||
1357 | ulg i, pixel; | ||
1358 | static int rows=0, prevpass=(-1); | ||
1359 | static ulg firstrow; | ||
1360 | |||
1361 | /*--------------------------------------------------------------------------- | ||
1362 | rows and firstrow simply track how many rows (and which ones) have not | ||
1363 | yet been displayed; alternatively, we could call XPutImage() for every | ||
1364 | row and not bother with the records-keeping. | ||
1365 | ---------------------------------------------------------------------------*/ | ||
1366 | |||
1367 | Trace((stderr, "beginning rpng2_x_display_row()\n")) | ||
1368 | |||
1369 | if (rpng2_info.pass != prevpass) { | ||
1370 | if (pause_after_pass && rpng2_info.pass > 0) { | ||
1371 | XEvent e; | ||
1372 | KeySym k; | ||
1373 | |||
1374 | fprintf(stderr, | ||
1375 | "%s: end of pass %d of 7; click in image window to continue\n", | ||
1376 | PROGNAME, prevpass + 1); | ||
1377 | do | ||
1378 | XNextEvent(display, &e); | ||
1379 | while (!QUIT(e,k)); | ||
1380 | } | ||
1381 | fprintf(stderr, "%s: pass %d of 7\r", PROGNAME, rpng2_info.pass + 1); | ||
1382 | fflush(stderr); | ||
1383 | prevpass = rpng2_info.pass; | ||
1384 | } | ||
1385 | |||
1386 | if (rows == 0) | ||
1387 | firstrow = row; /* first row that is not yet displayed */ | ||
1388 | |||
1389 | ++rows; /* count of rows received but not yet displayed */ | ||
1390 | |||
1391 | /*--------------------------------------------------------------------------- | ||
1392 | Aside from the use of the rpng2_info struct, the lack of an outer loop | ||
1393 | (over rows) and moving the XPutImage() call outside the "if (depth)" | ||
1394 | tests, this routine is identical to rpng_x_display_image() in the non- | ||
1395 | progressive version of the program. | ||
1396 | ---------------------------------------------------------------------------*/ | ||
1397 | |||
1398 | if (depth == 24 || depth == 32) { | ||
1399 | ulg red, green, blue; | ||
1400 | int bpp = ximage->bits_per_pixel; | ||
1401 | |||
1402 | src = rpng2_info.image_data + row*rpng2_info.rowbytes; | ||
1403 | if (bg_image) | ||
1404 | src2 = bg_data + row*bg_rowbytes; | ||
1405 | dest = ximage->data + row*ximage_rowbytes; | ||
1406 | if (rpng2_info.channels == 3) { | ||
1407 | for (i = rpng2_info.width; i > 0; --i) { | ||
1408 | red = *src++; | ||
1409 | green = *src++; | ||
1410 | blue = *src++; | ||
1411 | pixel = (red << RShift) | | ||
1412 | (green << GShift) | | ||
1413 | (blue << BShift); | ||
1414 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1415 | if (bpp == 32) { | ||
1416 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
1417 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1418 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1419 | *dest++ = (char)( pixel & 0xff); | ||
1420 | } else { | ||
1421 | /* GRR BUG? this assumes bpp == 24 & bits are packed low */ | ||
1422 | /* (probably need to use RShift, RMask, etc.) */ | ||
1423 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1424 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1425 | *dest++ = (char)( pixel & 0xff); | ||
1426 | } | ||
1427 | } | ||
1428 | } else /* if (rpng2_info.channels == 4) */ { | ||
1429 | for (i = rpng2_info.width; i > 0; --i) { | ||
1430 | r = *src++; | ||
1431 | g = *src++; | ||
1432 | b = *src++; | ||
1433 | a = *src++; | ||
1434 | if (bg_image) { | ||
1435 | bg_red = *src2++; | ||
1436 | bg_green = *src2++; | ||
1437 | bg_blue = *src2++; | ||
1438 | } | ||
1439 | if (a == 255) { | ||
1440 | red = r; | ||
1441 | green = g; | ||
1442 | blue = b; | ||
1443 | } else if (a == 0) { | ||
1444 | red = bg_red; | ||
1445 | green = bg_green; | ||
1446 | blue = bg_blue; | ||
1447 | } else { | ||
1448 | /* this macro (from png.h) composites the foreground | ||
1449 | * and background values and puts the result into the | ||
1450 | * first argument */ | ||
1451 | alpha_composite(red, r, a, bg_red); | ||
1452 | alpha_composite(green, g, a, bg_green); | ||
1453 | alpha_composite(blue, b, a, bg_blue); | ||
1454 | } | ||
1455 | pixel = (red << RShift) | | ||
1456 | (green << GShift) | | ||
1457 | (blue << BShift); | ||
1458 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1459 | if (bpp == 32) { | ||
1460 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
1461 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1462 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1463 | *dest++ = (char)( pixel & 0xff); | ||
1464 | } else { | ||
1465 | /* GRR BUG? this assumes bpp == 24 & bits are packed low */ | ||
1466 | /* (probably need to use RShift, RMask, etc.) */ | ||
1467 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1468 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1469 | *dest++ = (char)( pixel & 0xff); | ||
1470 | } | ||
1471 | } | ||
1472 | } | ||
1473 | |||
1474 | } else if (depth == 16) { | ||
1475 | ush red, green, blue; | ||
1476 | |||
1477 | src = rpng2_info.row_pointers[row]; | ||
1478 | if (bg_image) | ||
1479 | src2 = bg_data + row*bg_rowbytes; | ||
1480 | dest = ximage->data + row*ximage_rowbytes; | ||
1481 | if (rpng2_info.channels == 3) { | ||
1482 | for (i = rpng2_info.width; i > 0; --i) { | ||
1483 | red = ((ush)(*src) << 8); | ||
1484 | ++src; | ||
1485 | green = ((ush)(*src) << 8); | ||
1486 | ++src; | ||
1487 | blue = ((ush)(*src) << 8); | ||
1488 | ++src; | ||
1489 | pixel = ((red >> RShift) & RMask) | | ||
1490 | ((green >> GShift) & GMask) | | ||
1491 | ((blue >> BShift) & BMask); | ||
1492 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1493 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1494 | *dest++ = (char)( pixel & 0xff); | ||
1495 | } | ||
1496 | } else /* if (rpng2_info.channels == 4) */ { | ||
1497 | for (i = rpng2_info.width; i > 0; --i) { | ||
1498 | r = *src++; | ||
1499 | g = *src++; | ||
1500 | b = *src++; | ||
1501 | a = *src++; | ||
1502 | if (bg_image) { | ||
1503 | bg_red = *src2++; | ||
1504 | bg_green = *src2++; | ||
1505 | bg_blue = *src2++; | ||
1506 | } | ||
1507 | if (a == 255) { | ||
1508 | red = ((ush)r << 8); | ||
1509 | green = ((ush)g << 8); | ||
1510 | blue = ((ush)b << 8); | ||
1511 | } else if (a == 0) { | ||
1512 | red = ((ush)bg_red << 8); | ||
1513 | green = ((ush)bg_green << 8); | ||
1514 | blue = ((ush)bg_blue << 8); | ||
1515 | } else { | ||
1516 | /* this macro (from png.h) composites the foreground | ||
1517 | * and background values and puts the result back into | ||
1518 | * the first argument (== fg byte here: safe) */ | ||
1519 | alpha_composite(r, r, a, bg_red); | ||
1520 | alpha_composite(g, g, a, bg_green); | ||
1521 | alpha_composite(b, b, a, bg_blue); | ||
1522 | red = ((ush)r << 8); | ||
1523 | green = ((ush)g << 8); | ||
1524 | blue = ((ush)b << 8); | ||
1525 | } | ||
1526 | pixel = ((red >> RShift) & RMask) | | ||
1527 | ((green >> GShift) & GMask) | | ||
1528 | ((blue >> BShift) & BMask); | ||
1529 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1530 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1531 | *dest++ = (char)( pixel & 0xff); | ||
1532 | } | ||
1533 | } | ||
1534 | |||
1535 | } else /* depth == 8 */ { | ||
1536 | |||
1537 | /* GRR: add 8-bit support */ | ||
1538 | |||
1539 | } | ||
1540 | |||
1541 | |||
1542 | /*--------------------------------------------------------------------------- | ||
1543 | Display after every 16 rows or when on one of last two rows. (Region | ||
1544 | may include previously displayed lines due to interlacing--i.e., not | ||
1545 | contiguous. Also, second-to-last row is final one in interlaced images | ||
1546 | with odd number of rows.) For demos, flush (and delay) after every 16th | ||
1547 | row so "sparse" passes don't go twice as fast. | ||
1548 | ---------------------------------------------------------------------------*/ | ||
1549 | |||
1550 | if (demo_timing && (row - firstrow >= 16 || row >= rpng2_info.height-2)) { | ||
1551 | XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0, | ||
1552 | (int)firstrow, rpng2_info.width, row - firstrow + 1); | ||
1553 | XFlush(display); | ||
1554 | rows = 0; | ||
1555 | usleep(usleep_duration); | ||
1556 | } else | ||
1557 | if (!demo_timing && ((rows & 0xf) == 0 || row >= rpng2_info.height-2)) { | ||
1558 | XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0, | ||
1559 | (int)firstrow, rpng2_info.width, row - firstrow + 1); | ||
1560 | XFlush(display); | ||
1561 | rows = 0; | ||
1562 | } | ||
1563 | |||
1564 | } | ||
1565 | |||
1566 | |||
1567 | |||
1568 | |||
1569 | |||
1570 | static void rpng2_x_finish_display(void) | ||
1571 | { | ||
1572 | Trace((stderr, "beginning rpng2_x_finish_display()\n")) | ||
1573 | |||
1574 | /* last row has already been displayed by rpng2_x_display_row(), so we | ||
1575 | * have nothing to do here except set a flag and let the user know that | ||
1576 | * the image is done */ | ||
1577 | |||
1578 | rpng2_info.state = kDone; | ||
1579 | printf( | ||
1580 | "Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"); | ||
1581 | fflush(stdout); | ||
1582 | } | ||
1583 | |||
1584 | |||
1585 | |||
1586 | |||
1587 | |||
1588 | static void rpng2_x_redisplay_image(ulg startcol, ulg startrow, | ||
1589 | ulg width, ulg height) | ||
1590 | { | ||
1591 | uch bg_red = rpng2_info.bg_red; | ||
1592 | uch bg_green = rpng2_info.bg_green; | ||
1593 | uch bg_blue = rpng2_info.bg_blue; | ||
1594 | uch *src, *src2=NULL; | ||
1595 | char *dest; | ||
1596 | uch r, g, b, a; | ||
1597 | ulg i, row, lastrow = 0; | ||
1598 | ulg pixel; | ||
1599 | int ximage_rowbytes = ximage->bytes_per_line; | ||
1600 | |||
1601 | |||
1602 | Trace((stderr, "beginning display loop (image_channels == %d)\n", | ||
1603 | rpng2_info.channels)) | ||
1604 | Trace((stderr, " (width = %ld, rowbytes = %d, ximage_rowbytes = %d)\n", | ||
1605 | rpng2_info.width, rpng2_info.rowbytes, ximage_rowbytes)) | ||
1606 | Trace((stderr, " (bpp = %d)\n", ximage->bits_per_pixel)) | ||
1607 | Trace((stderr, " (byte_order = %s)\n", ximage->byte_order == MSBFirst? | ||
1608 | "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown"))) | ||
1609 | |||
1610 | /*--------------------------------------------------------------------------- | ||
1611 | Aside from the use of the rpng2_info struct and of src2 (for background | ||
1612 | image), this routine is identical to rpng_x_display_image() in the non- | ||
1613 | progressive version of the program--for the simple reason that redisplay | ||
1614 | of the image against a new background happens after the image is fully | ||
1615 | decoded and therefore is, by definition, non-progressive. | ||
1616 | ---------------------------------------------------------------------------*/ | ||
1617 | |||
1618 | if (depth == 24 || depth == 32) { | ||
1619 | ulg red, green, blue; | ||
1620 | int bpp = ximage->bits_per_pixel; | ||
1621 | |||
1622 | for (lastrow = row = startrow; row < startrow+height; ++row) { | ||
1623 | src = rpng2_info.image_data + row*rpng2_info.rowbytes; | ||
1624 | if (bg_image) | ||
1625 | src2 = bg_data + row*bg_rowbytes; | ||
1626 | dest = ximage->data + row*ximage_rowbytes; | ||
1627 | if (rpng2_info.channels == 3) { | ||
1628 | for (i = rpng2_info.width; i > 0; --i) { | ||
1629 | red = *src++; | ||
1630 | green = *src++; | ||
1631 | blue = *src++; | ||
1632 | #ifdef NO_24BIT_MASKS | ||
1633 | pixel = (red << RShift) | | ||
1634 | (green << GShift) | | ||
1635 | (blue << BShift); | ||
1636 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1637 | if (bpp == 32) { | ||
1638 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
1639 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1640 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1641 | *dest++ = (char)( pixel & 0xff); | ||
1642 | } else { | ||
1643 | /* this assumes bpp == 24 & bits are packed low */ | ||
1644 | /* (probably need to use RShift, RMask, etc.) */ | ||
1645 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1646 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1647 | *dest++ = (char)( pixel & 0xff); | ||
1648 | } | ||
1649 | #else | ||
1650 | red = (RShift < 0)? red << (-RShift) : red >> RShift; | ||
1651 | green = (GShift < 0)? green << (-GShift) : green >> GShift; | ||
1652 | blue = (BShift < 0)? blue << (-BShift) : blue >> BShift; | ||
1653 | pixel = (red & RMask) | (green & GMask) | (blue & BMask); | ||
1654 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1655 | if (bpp == 32) { | ||
1656 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
1657 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1658 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1659 | *dest++ = (char)( pixel & 0xff); | ||
1660 | } else { | ||
1661 | /* GRR BUG */ | ||
1662 | /* this assumes bpp == 24 & bits are packed low */ | ||
1663 | /* (probably need to use RShift/RMask/etc. here, too) */ | ||
1664 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1665 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1666 | *dest++ = (char)( pixel & 0xff); | ||
1667 | } | ||
1668 | #endif | ||
1669 | } | ||
1670 | |||
1671 | } else /* if (rpng2_info.channels == 4) */ { | ||
1672 | for (i = rpng2_info.width; i > 0; --i) { | ||
1673 | r = *src++; | ||
1674 | g = *src++; | ||
1675 | b = *src++; | ||
1676 | a = *src++; | ||
1677 | if (bg_image) { | ||
1678 | bg_red = *src2++; | ||
1679 | bg_green = *src2++; | ||
1680 | bg_blue = *src2++; | ||
1681 | } | ||
1682 | if (a == 255) { | ||
1683 | red = r; | ||
1684 | green = g; | ||
1685 | blue = b; | ||
1686 | } else if (a == 0) { | ||
1687 | red = bg_red; | ||
1688 | green = bg_green; | ||
1689 | blue = bg_blue; | ||
1690 | } else { | ||
1691 | /* this macro (from png.h) composites the foreground | ||
1692 | * and background values and puts the result into the | ||
1693 | * first argument */ | ||
1694 | alpha_composite(red, r, a, bg_red); | ||
1695 | alpha_composite(green, g, a, bg_green); | ||
1696 | alpha_composite(blue, b, a, bg_blue); | ||
1697 | } | ||
1698 | #ifdef NO_24BIT_MASKS | ||
1699 | pixel = (red << RShift) | | ||
1700 | (green << GShift) | | ||
1701 | (blue << BShift); | ||
1702 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1703 | if (bpp == 32) { | ||
1704 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
1705 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1706 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1707 | *dest++ = (char)( pixel & 0xff); | ||
1708 | } else { | ||
1709 | /* this assumes bpp == 24 & bits are packed low */ | ||
1710 | /* (probably need to use RShift, RMask, etc.) */ | ||
1711 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1712 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1713 | *dest++ = (char)( pixel & 0xff); | ||
1714 | } | ||
1715 | #else | ||
1716 | red = (RShift < 0)? red << (-RShift) : red >> RShift; | ||
1717 | green = (GShift < 0)? green << (-GShift) : green >> GShift; | ||
1718 | blue = (BShift < 0)? blue << (-BShift) : blue >> BShift; | ||
1719 | pixel = (red & RMask) | (green & GMask) | (blue & BMask); | ||
1720 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1721 | if (bpp == 32) { | ||
1722 | *dest++ = (char)((pixel >> 24) & 0xff); | ||
1723 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1724 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1725 | *dest++ = (char)( pixel & 0xff); | ||
1726 | } else { | ||
1727 | /* GRR BUG */ | ||
1728 | /* this assumes bpp == 24 & bits are packed low */ | ||
1729 | /* (probably need to use RShift/RMask/etc. here, too) */ | ||
1730 | *dest++ = (char)((pixel >> 16) & 0xff); | ||
1731 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1732 | *dest++ = (char)( pixel & 0xff); | ||
1733 | } | ||
1734 | #endif | ||
1735 | } | ||
1736 | } | ||
1737 | /* display after every 16 lines */ | ||
1738 | if (((row+1) & 0xf) == 0) { | ||
1739 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, | ||
1740 | (int)lastrow, rpng2_info.width, 16); | ||
1741 | XFlush(display); | ||
1742 | lastrow = row + 1; | ||
1743 | } | ||
1744 | } | ||
1745 | |||
1746 | } else if (depth == 16) { | ||
1747 | ush red, green, blue; | ||
1748 | |||
1749 | for (lastrow = row = startrow; row < startrow+height; ++row) { | ||
1750 | src = rpng2_info.row_pointers[row]; | ||
1751 | if (bg_image) | ||
1752 | src2 = bg_data + row*bg_rowbytes; | ||
1753 | dest = ximage->data + row*ximage_rowbytes; | ||
1754 | if (rpng2_info.channels == 3) { | ||
1755 | for (i = rpng2_info.width; i > 0; --i) { | ||
1756 | red = ((ush)(*src) << 8); | ||
1757 | ++src; | ||
1758 | green = ((ush)(*src) << 8); | ||
1759 | ++src; | ||
1760 | blue = ((ush)(*src) << 8); | ||
1761 | ++src; | ||
1762 | pixel = ((red >> RShift) & RMask) | | ||
1763 | ((green >> GShift) & GMask) | | ||
1764 | ((blue >> BShift) & BMask); | ||
1765 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1766 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1767 | *dest++ = (char)( pixel & 0xff); | ||
1768 | } | ||
1769 | } else /* if (rpng2_info.channels == 4) */ { | ||
1770 | for (i = rpng2_info.width; i > 0; --i) { | ||
1771 | r = *src++; | ||
1772 | g = *src++; | ||
1773 | b = *src++; | ||
1774 | a = *src++; | ||
1775 | if (bg_image) { | ||
1776 | bg_red = *src2++; | ||
1777 | bg_green = *src2++; | ||
1778 | bg_blue = *src2++; | ||
1779 | } | ||
1780 | if (a == 255) { | ||
1781 | red = ((ush)r << 8); | ||
1782 | green = ((ush)g << 8); | ||
1783 | blue = ((ush)b << 8); | ||
1784 | } else if (a == 0) { | ||
1785 | red = ((ush)bg_red << 8); | ||
1786 | green = ((ush)bg_green << 8); | ||
1787 | blue = ((ush)bg_blue << 8); | ||
1788 | } else { | ||
1789 | /* this macro (from png.h) composites the foreground | ||
1790 | * and background values and puts the result back into | ||
1791 | * the first argument (== fg byte here: safe) */ | ||
1792 | alpha_composite(r, r, a, bg_red); | ||
1793 | alpha_composite(g, g, a, bg_green); | ||
1794 | alpha_composite(b, b, a, bg_blue); | ||
1795 | red = ((ush)r << 8); | ||
1796 | green = ((ush)g << 8); | ||
1797 | blue = ((ush)b << 8); | ||
1798 | } | ||
1799 | pixel = ((red >> RShift) & RMask) | | ||
1800 | ((green >> GShift) & GMask) | | ||
1801 | ((blue >> BShift) & BMask); | ||
1802 | /* recall that we set ximage->byte_order = MSBFirst above */ | ||
1803 | *dest++ = (char)((pixel >> 8) & 0xff); | ||
1804 | *dest++ = (char)( pixel & 0xff); | ||
1805 | } | ||
1806 | } | ||
1807 | /* display after every 16 lines */ | ||
1808 | if (((row+1) & 0xf) == 0) { | ||
1809 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, | ||
1810 | (int)lastrow, rpng2_info.width, 16); | ||
1811 | XFlush(display); | ||
1812 | lastrow = row + 1; | ||
1813 | } | ||
1814 | } | ||
1815 | |||
1816 | } else /* depth == 8 */ { | ||
1817 | |||
1818 | /* GRR: add 8-bit support */ | ||
1819 | |||
1820 | } | ||
1821 | |||
1822 | Trace((stderr, "calling final XPutImage()\n")) | ||
1823 | if (lastrow < startrow+height) { | ||
1824 | XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0, | ||
1825 | (int)lastrow, rpng2_info.width, rpng2_info.height-lastrow); | ||
1826 | XFlush(display); | ||
1827 | } | ||
1828 | |||
1829 | } /* end function rpng2_x_redisplay_image() */ | ||
1830 | |||
1831 | |||
1832 | |||
1833 | |||
1834 | |||
1835 | #ifdef FEATURE_LOOP | ||
1836 | |||
1837 | static void rpng2_x_reload_bg_image(void) | ||
1838 | { | ||
1839 | char *dest; | ||
1840 | uch r1, r2, g1, g2, b1, b2; | ||
1841 | uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv; | ||
1842 | int k, hmax, max; | ||
1843 | int xidx, yidx, yidx_max; | ||
1844 | int even_odd_vert, even_odd_horiz, even_odd; | ||
1845 | int invert_gradient2 = (bg[pat].type & 0x08); | ||
1846 | int invert_column; | ||
1847 | ulg i, row; | ||
1848 | |||
1849 | |||
1850 | bgscale = (pat == 0)? 8 : bgscale_default; | ||
1851 | yidx_max = bgscale - 1; | ||
1852 | |||
1853 | /*--------------------------------------------------------------------------- | ||
1854 | Vertical gradients (ramps) in NxN squares, alternating direction and | ||
1855 | colors (N == bgscale). | ||
1856 | ---------------------------------------------------------------------------*/ | ||
1857 | |||
1858 | if ((bg[pat].type & 0x07) == 0) { | ||
1859 | uch r1_min = rgb[bg[pat].rgb1_min].r; | ||
1860 | uch g1_min = rgb[bg[pat].rgb1_min].g; | ||
1861 | uch b1_min = rgb[bg[pat].rgb1_min].b; | ||
1862 | uch r2_min = rgb[bg[pat].rgb2_min].r; | ||
1863 | uch g2_min = rgb[bg[pat].rgb2_min].g; | ||
1864 | uch b2_min = rgb[bg[pat].rgb2_min].b; | ||
1865 | int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min; | ||
1866 | int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min; | ||
1867 | int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min; | ||
1868 | int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min; | ||
1869 | int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min; | ||
1870 | int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min; | ||
1871 | |||
1872 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1873 | yidx = (int)(row % bgscale); | ||
1874 | even_odd_vert = (int)((row / bgscale) & 1); | ||
1875 | |||
1876 | r1 = r1_min + (r1_diff * yidx) / yidx_max; | ||
1877 | g1 = g1_min + (g1_diff * yidx) / yidx_max; | ||
1878 | b1 = b1_min + (b1_diff * yidx) / yidx_max; | ||
1879 | r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max; | ||
1880 | g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max; | ||
1881 | b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max; | ||
1882 | |||
1883 | r2 = r2_min + (r2_diff * yidx) / yidx_max; | ||
1884 | g2 = g2_min + (g2_diff * yidx) / yidx_max; | ||
1885 | b2 = b2_min + (b2_diff * yidx) / yidx_max; | ||
1886 | r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max; | ||
1887 | g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max; | ||
1888 | b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max; | ||
1889 | |||
1890 | dest = (char *)bg_data + row*bg_rowbytes; | ||
1891 | for (i = 0; i < rpng2_info.width; ++i) { | ||
1892 | even_odd_horiz = (int)((i / bgscale) & 1); | ||
1893 | even_odd = even_odd_vert ^ even_odd_horiz; | ||
1894 | invert_column = | ||
1895 | (even_odd_horiz && (bg[pat].type & 0x10)); | ||
1896 | if (even_odd == 0) { /* gradient #1 */ | ||
1897 | if (invert_column) { | ||
1898 | *dest++ = r1_inv; | ||
1899 | *dest++ = g1_inv; | ||
1900 | *dest++ = b1_inv; | ||
1901 | } else { | ||
1902 | *dest++ = r1; | ||
1903 | *dest++ = g1; | ||
1904 | *dest++ = b1; | ||
1905 | } | ||
1906 | } else { /* gradient #2 */ | ||
1907 | if ((invert_column && invert_gradient2) || | ||
1908 | (!invert_column && !invert_gradient2)) | ||
1909 | { | ||
1910 | *dest++ = r2; /* not inverted or */ | ||
1911 | *dest++ = g2; /* doubly inverted */ | ||
1912 | *dest++ = b2; | ||
1913 | } else { | ||
1914 | *dest++ = r2_inv; | ||
1915 | *dest++ = g2_inv; /* singly inverted */ | ||
1916 | *dest++ = b2_inv; | ||
1917 | } | ||
1918 | } | ||
1919 | } | ||
1920 | } | ||
1921 | |||
1922 | /*--------------------------------------------------------------------------- | ||
1923 | Soft gradient-diamonds with scale = bgscale. Code contributed by Adam | ||
1924 | M. Costello. | ||
1925 | ---------------------------------------------------------------------------*/ | ||
1926 | |||
1927 | } else if ((bg[pat].type & 0x07) == 1) { | ||
1928 | |||
1929 | hmax = (bgscale-1)/2; /* half the max weight of a color */ | ||
1930 | max = 2*hmax; /* the max weight of a color */ | ||
1931 | |||
1932 | r1 = rgb[bg[pat].rgb1_max].r; | ||
1933 | g1 = rgb[bg[pat].rgb1_max].g; | ||
1934 | b1 = rgb[bg[pat].rgb1_max].b; | ||
1935 | r2 = rgb[bg[pat].rgb2_max].r; | ||
1936 | g2 = rgb[bg[pat].rgb2_max].g; | ||
1937 | b2 = rgb[bg[pat].rgb2_max].b; | ||
1938 | |||
1939 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1940 | yidx = (int)(row % bgscale); | ||
1941 | if (yidx > hmax) | ||
1942 | yidx = bgscale-1 - yidx; | ||
1943 | dest = (char *)bg_data + row*bg_rowbytes; | ||
1944 | for (i = 0; i < rpng2_info.width; ++i) { | ||
1945 | xidx = (int)(i % bgscale); | ||
1946 | if (xidx > hmax) | ||
1947 | xidx = bgscale-1 - xidx; | ||
1948 | k = xidx + yidx; | ||
1949 | *dest++ = (k*r1 + (max-k)*r2) / max; | ||
1950 | *dest++ = (k*g1 + (max-k)*g2) / max; | ||
1951 | *dest++ = (k*b1 + (max-k)*b2) / max; | ||
1952 | } | ||
1953 | } | ||
1954 | |||
1955 | /*--------------------------------------------------------------------------- | ||
1956 | Radial "starburst" with azimuthal sinusoids; [eventually number of sinu- | ||
1957 | soids will equal bgscale?]. This one is slow but very cool. Code con- | ||
1958 | tributed by Pieter S. van der Meulen (originally in Smalltalk). | ||
1959 | ---------------------------------------------------------------------------*/ | ||
1960 | |||
1961 | } else if ((bg[pat].type & 0x07) == 2) { | ||
1962 | uch ch; | ||
1963 | int ii, x, y, hw, hh, grayspot; | ||
1964 | double freq, rotate, saturate, gray, intensity; | ||
1965 | double angle=0.0, aoffset=0.0, maxDist, dist; | ||
1966 | double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t; | ||
1967 | |||
1968 | hh = (int)(rpng2_info.height / 2); | ||
1969 | hw = (int)(rpng2_info.width / 2); | ||
1970 | |||
1971 | /* variables for radial waves: | ||
1972 | * aoffset: number of degrees to rotate hue [CURRENTLY NOT USED] | ||
1973 | * freq: number of color beams originating from the center | ||
1974 | * grayspot: size of the graying center area (anti-alias) | ||
1975 | * rotate: rotation of the beams as a function of radius | ||
1976 | * saturate: saturation of beams' shape azimuthally | ||
1977 | */ | ||
1978 | angle = CLIP(angle, 0.0, 360.0); | ||
1979 | grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw)); | ||
1980 | freq = MAX((double)bg[pat].bg_freq, 0.0); | ||
1981 | saturate = (double)bg[pat].bg_bsat * 0.1; | ||
1982 | rotate = (double)bg[pat].bg_brot * 0.1; | ||
1983 | gray = 0.0; | ||
1984 | intensity = 0.0; | ||
1985 | maxDist = (double)((hw*hw) + (hh*hh)); | ||
1986 | |||
1987 | for (row = 0; row < rpng2_info.height; ++row) { | ||
1988 | y = (int)(row - hh); | ||
1989 | dest = (char *)bg_data + row*bg_rowbytes; | ||
1990 | for (i = 0; i < rpng2_info.width; ++i) { | ||
1991 | x = (int)(i - hw); | ||
1992 | angle = (x == 0)? PI_2 : atan((double)y / (double)x); | ||
1993 | gray = (double)MAX(ABS(y), ABS(x)) / grayspot; | ||
1994 | gray = MIN(1.0, gray); | ||
1995 | dist = (double)((x*x) + (y*y)) / maxDist; | ||
1996 | intensity = cos((angle+(rotate*dist*PI)) * freq) * | ||
1997 | gray * saturate; | ||
1998 | intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5; | ||
1999 | hue = (angle + PI) * INV_PI_360 + aoffset; | ||
2000 | s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh)); | ||
2001 | s = MIN(MAX(s,0.0), 1.0); | ||
2002 | v = MIN(MAX(intensity,0.0), 1.0); | ||
2003 | |||
2004 | if (s == 0.0) { | ||
2005 | ch = (uch)(v * 255.0); | ||
2006 | *dest++ = ch; | ||
2007 | *dest++ = ch; | ||
2008 | *dest++ = ch; | ||
2009 | } else { | ||
2010 | if ((hue < 0.0) || (hue >= 360.0)) | ||
2011 | hue -= (((int)(hue / 360.0)) * 360.0); | ||
2012 | hue /= 60.0; | ||
2013 | ii = (int)hue; | ||
2014 | f = hue - (double)ii; | ||
2015 | p = (1.0 - s) * v; | ||
2016 | q = (1.0 - (s * f)) * v; | ||
2017 | t = (1.0 - (s * (1.0 - f))) * v; | ||
2018 | if (ii == 0) { red = v; green = t; blue = p; } | ||
2019 | else if (ii == 1) { red = q; green = v; blue = p; } | ||
2020 | else if (ii == 2) { red = p; green = v; blue = t; } | ||
2021 | else if (ii == 3) { red = p; green = q; blue = v; } | ||
2022 | else if (ii == 4) { red = t; green = p; blue = v; } | ||
2023 | else if (ii == 5) { red = v; green = p; blue = q; } | ||
2024 | *dest++ = (uch)(red * 255.0); | ||
2025 | *dest++ = (uch)(green * 255.0); | ||
2026 | *dest++ = (uch)(blue * 255.0); | ||
2027 | } | ||
2028 | } | ||
2029 | } | ||
2030 | } | ||
2031 | |||
2032 | } /* end function rpng2_x_reload_bg_image() */ | ||
2033 | |||
2034 | |||
2035 | |||
2036 | |||
2037 | |||
2038 | static int is_number(char *p) | ||
2039 | { | ||
2040 | while (*p) { | ||
2041 | if (!isdigit(*p)) | ||
2042 | return FALSE; | ||
2043 | ++p; | ||
2044 | } | ||
2045 | return TRUE; | ||
2046 | } | ||
2047 | |||
2048 | #endif /* FEATURE_LOOP */ | ||
2049 | |||
2050 | |||
2051 | |||
2052 | |||
2053 | |||
2054 | static void rpng2_x_cleanup(void) | ||
2055 | { | ||
2056 | if (bg_image && bg_data) { | ||
2057 | free(bg_data); | ||
2058 | bg_data = NULL; | ||
2059 | } | ||
2060 | |||
2061 | if (rpng2_info.image_data) { | ||
2062 | free(rpng2_info.image_data); | ||
2063 | rpng2_info.image_data = NULL; | ||
2064 | } | ||
2065 | |||
2066 | if (rpng2_info.row_pointers) { | ||
2067 | free(rpng2_info.row_pointers); | ||
2068 | rpng2_info.row_pointers = NULL; | ||
2069 | } | ||
2070 | |||
2071 | if (ximage) { | ||
2072 | if (ximage->data) { | ||
2073 | free(ximage->data); /* we allocated it, so we free it */ | ||
2074 | ximage->data = (char *)NULL; /* instead of XDestroyImage() */ | ||
2075 | } | ||
2076 | XDestroyImage(ximage); | ||
2077 | ximage = NULL; | ||
2078 | } | ||
2079 | |||
2080 | if (have_gc) | ||
2081 | XFreeGC(display, gc); | ||
2082 | |||
2083 | if (have_window) | ||
2084 | XDestroyWindow(display, window); | ||
2085 | |||
2086 | if (have_colormap) | ||
2087 | XFreeColormap(display, colormap); | ||
2088 | |||
2089 | if (have_nondefault_visual) | ||
2090 | XFree(visual_list); | ||
2091 | } | ||
2092 | |||
2093 | |||
2094 | |||
2095 | |||
2096 | |||
2097 | static int rpng2_x_msb(ulg u32val) | ||
2098 | { | ||
2099 | int i; | ||
2100 | |||
2101 | for (i = 31; i >= 0; --i) { | ||
2102 | if (u32val & 0x80000000L) | ||
2103 | break; | ||
2104 | u32val <<= 1; | ||
2105 | } | ||
2106 | return i; | ||
2107 | } | ||