| 1 |
/* $Header$ */ |
| 2 |
|
| 3 |
/* |
| 4 |
* tkVisual.c -- |
| 5 |
* |
| 6 |
* This file contains library procedures for allocating and |
| 7 |
* freeing visuals and colormaps. This code is based on a |
| 8 |
* prototype implementation by Paul Mackerras. |
| 9 |
* |
| 10 |
* Copyright (c) 1994 The Regents of the University of California. |
| 11 |
* Copyright (c) 1994-1997 Sun Microsystems, Inc. |
| 12 |
* |
| 13 |
* See the file "license.terms" for information on usage and redistribution |
| 14 |
* of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
| 15 |
* |
| 16 |
* RCS: @(#) $Id: tkvisual.c,v 1.1.1.1 2001/06/13 05:11:40 dtashley Exp $ |
| 17 |
*/ |
| 18 |
|
| 19 |
#include "tkInt.h" |
| 20 |
#include "tkPort.h" |
| 21 |
|
| 22 |
/* |
| 23 |
* The table below maps from symbolic names for visual classes |
| 24 |
* to the associated X class symbols. |
| 25 |
*/ |
| 26 |
|
| 27 |
typedef struct VisualDictionary { |
| 28 |
char *name; /* Textual name of class. */ |
| 29 |
int minLength; /* Minimum # characters that must be |
| 30 |
* specified for an unambiguous match. */ |
| 31 |
int class; /* X symbol for class. */ |
| 32 |
} VisualDictionary; |
| 33 |
static VisualDictionary visualNames[] = { |
| 34 |
{"best", 1, 0}, |
| 35 |
{"directcolor", 2, DirectColor}, |
| 36 |
{"grayscale", 1, GrayScale}, |
| 37 |
{"greyscale", 1, GrayScale}, |
| 38 |
{"pseudocolor", 1, PseudoColor}, |
| 39 |
{"staticcolor", 7, StaticColor}, |
| 40 |
{"staticgray", 7, StaticGray}, |
| 41 |
{"staticgrey", 7, StaticGray}, |
| 42 |
{"truecolor", 1, TrueColor}, |
| 43 |
{NULL, 0, 0}, |
| 44 |
}; |
| 45 |
|
| 46 |
/* |
| 47 |
* One of the following structures exists for each distinct non-default |
| 48 |
* colormap allocated for a display by Tk_GetColormap. |
| 49 |
*/ |
| 50 |
|
| 51 |
struct TkColormap { |
| 52 |
Colormap colormap; /* X's identifier for the colormap. */ |
| 53 |
Visual *visual; /* Visual for which colormap was |
| 54 |
* allocated. */ |
| 55 |
int refCount; /* How many uses of the colormap are still |
| 56 |
* outstanding (calls to Tk_GetColormap |
| 57 |
* minus calls to Tk_FreeColormap). */ |
| 58 |
int shareable; /* 0 means this colormap was allocated by |
| 59 |
* a call to Tk_GetColormap with "new", |
| 60 |
* implying that the window wants it all |
| 61 |
* for itself. 1 means that the colormap |
| 62 |
* was allocated as a default for a particular |
| 63 |
* visual, so it can be shared. */ |
| 64 |
struct TkColormap *nextPtr; /* Next in list of colormaps for this display, |
| 65 |
* or NULL for end of list. */ |
| 66 |
}; |
| 67 |
|
| 68 |
/* |
| 69 |
*---------------------------------------------------------------------- |
| 70 |
* |
| 71 |
* Tk_GetVisual -- |
| 72 |
* |
| 73 |
* Given a string identifying a particular kind of visual, this |
| 74 |
* procedure returns a visual and depth that matches the specification. |
| 75 |
* |
| 76 |
* Results: |
| 77 |
* The return value is normally a pointer to a visual. If an |
| 78 |
* error occurred in looking up the visual, NULL is returned and |
| 79 |
* an error message is left in the interp's result. The depth of the |
| 80 |
* visual is returned to *depthPtr under normal returns. If |
| 81 |
* colormapPtr is non-NULL, then this procedure also finds a |
| 82 |
* suitable colormap for use with the visual in tkwin, and it |
| 83 |
* returns that colormap in *colormapPtr unless an error occurs. |
| 84 |
* |
| 85 |
* Side effects: |
| 86 |
* A new colormap may be allocated. |
| 87 |
* |
| 88 |
*---------------------------------------------------------------------- |
| 89 |
*/ |
| 90 |
|
| 91 |
Visual * |
| 92 |
Tk_GetVisual(interp, tkwin, string, depthPtr, colormapPtr) |
| 93 |
Tcl_Interp *interp; /* Interpreter to use for error |
| 94 |
* reporting. */ |
| 95 |
Tk_Window tkwin; /* Window in which visual will be |
| 96 |
* used. */ |
| 97 |
char *string; /* String describing visual. See |
| 98 |
* manual entry for details. */ |
| 99 |
int *depthPtr; /* The depth of the returned visual |
| 100 |
* is stored here. */ |
| 101 |
Colormap *colormapPtr; /* If non-NULL, then a suitable |
| 102 |
* colormap for visual is placed here. |
| 103 |
* This colormap must eventually be |
| 104 |
* freed by calling Tk_FreeColormap. */ |
| 105 |
{ |
| 106 |
Tk_Window tkwin2; |
| 107 |
XVisualInfo template, *visInfoList, *bestPtr; |
| 108 |
long mask; |
| 109 |
Visual *visual; |
| 110 |
int length, c, numVisuals, prio, bestPrio, i; |
| 111 |
char *p; |
| 112 |
VisualDictionary *dictPtr; |
| 113 |
TkColormap *cmapPtr; |
| 114 |
TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr; |
| 115 |
|
| 116 |
/* |
| 117 |
* Parse string and set up a template for use in searching for |
| 118 |
* an appropriate visual. |
| 119 |
*/ |
| 120 |
|
| 121 |
c = string[0]; |
| 122 |
if (c == '.') { |
| 123 |
/* |
| 124 |
* The string must be a window name. If the window is on the |
| 125 |
* same screen as tkwin, then just use its visual. Otherwise |
| 126 |
* use the information about the visual as a template for the |
| 127 |
* search. |
| 128 |
*/ |
| 129 |
|
| 130 |
tkwin2 = Tk_NameToWindow(interp, string, tkwin); |
| 131 |
if (tkwin2 == NULL) { |
| 132 |
return NULL; |
| 133 |
} |
| 134 |
visual = Tk_Visual(tkwin2); |
| 135 |
if (Tk_Screen(tkwin) == Tk_Screen(tkwin2)) { |
| 136 |
*depthPtr = Tk_Depth(tkwin2); |
| 137 |
if (colormapPtr != NULL) { |
| 138 |
/* |
| 139 |
* Use the colormap from the other window too (but be sure |
| 140 |
* to increment its reference count if it's one of the ones |
| 141 |
* allocated here). |
| 142 |
*/ |
| 143 |
|
| 144 |
*colormapPtr = Tk_Colormap(tkwin2); |
| 145 |
for (cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL; |
| 146 |
cmapPtr = cmapPtr->nextPtr) { |
| 147 |
if (cmapPtr->colormap == *colormapPtr) { |
| 148 |
cmapPtr->refCount += 1; |
| 149 |
break; |
| 150 |
} |
| 151 |
} |
| 152 |
} |
| 153 |
return visual; |
| 154 |
} |
| 155 |
template.depth = Tk_Depth(tkwin2); |
| 156 |
template.class = visual->class; |
| 157 |
template.red_mask = visual->red_mask; |
| 158 |
template.green_mask = visual->green_mask; |
| 159 |
template.blue_mask = visual->blue_mask; |
| 160 |
template.colormap_size = visual->map_entries; |
| 161 |
template.bits_per_rgb = visual->bits_per_rgb; |
| 162 |
mask = VisualDepthMask|VisualClassMask|VisualRedMaskMask |
| 163 |
|VisualGreenMaskMask|VisualBlueMaskMask|VisualColormapSizeMask |
| 164 |
|VisualBitsPerRGBMask; |
| 165 |
} else if ((c == 0) || ((c == 'd') && (string[1] != 0) |
| 166 |
&& (strncmp(string, "default", strlen(string)) == 0))) { |
| 167 |
/* |
| 168 |
* Use the default visual for the window's screen. |
| 169 |
*/ |
| 170 |
|
| 171 |
if (colormapPtr != NULL) { |
| 172 |
*colormapPtr = DefaultColormapOfScreen(Tk_Screen(tkwin)); |
| 173 |
} |
| 174 |
*depthPtr = DefaultDepthOfScreen(Tk_Screen(tkwin)); |
| 175 |
return DefaultVisualOfScreen(Tk_Screen(tkwin)); |
| 176 |
} else if (isdigit(UCHAR(c))) { |
| 177 |
int visualId; |
| 178 |
|
| 179 |
/* |
| 180 |
* This is a visual ID. |
| 181 |
*/ |
| 182 |
|
| 183 |
if (Tcl_GetInt(interp, string, &visualId) == TCL_ERROR) { |
| 184 |
Tcl_ResetResult(interp); |
| 185 |
Tcl_AppendResult(interp, "bad X identifier for visual: ", |
| 186 |
string, "\"", (char *) NULL); |
| 187 |
return NULL; |
| 188 |
} |
| 189 |
template.visualid = visualId; |
| 190 |
mask = VisualIDMask; |
| 191 |
} else { |
| 192 |
/* |
| 193 |
* Parse the string into a class name (or "best") optionally |
| 194 |
* followed by whitespace and a depth. |
| 195 |
*/ |
| 196 |
|
| 197 |
for (p = string; *p != 0; p++) { |
| 198 |
if (isspace(UCHAR(*p)) || isdigit(UCHAR(*p))) { |
| 199 |
break; |
| 200 |
} |
| 201 |
} |
| 202 |
length = p - string; |
| 203 |
template.class = -1; |
| 204 |
for (dictPtr = visualNames; dictPtr->name != NULL; dictPtr++) { |
| 205 |
if ((dictPtr->name[0] == c) && (length >= dictPtr->minLength) |
| 206 |
&& (strncmp(string, dictPtr->name, |
| 207 |
(size_t) length) == 0)) { |
| 208 |
template.class = dictPtr->class; |
| 209 |
break; |
| 210 |
} |
| 211 |
} |
| 212 |
if (template.class == -1) { |
| 213 |
Tcl_AppendResult(interp, "unknown or ambiguous visual name \"", |
| 214 |
string, "\": class must be ", (char *) NULL); |
| 215 |
for (dictPtr = visualNames; dictPtr->name != NULL; dictPtr++) { |
| 216 |
Tcl_AppendResult(interp, dictPtr->name, ", ", (char *) NULL); |
| 217 |
} |
| 218 |
Tcl_AppendResult(interp, "or default", (char *) NULL); |
| 219 |
return NULL; |
| 220 |
} |
| 221 |
while (isspace(UCHAR(*p))) { |
| 222 |
p++; |
| 223 |
} |
| 224 |
if (*p == 0) { |
| 225 |
template.depth = 10000; |
| 226 |
} else { |
| 227 |
if (Tcl_GetInt(interp, p, &template.depth) != TCL_OK) { |
| 228 |
return NULL; |
| 229 |
} |
| 230 |
} |
| 231 |
if (c == 'b') { |
| 232 |
mask = 0; |
| 233 |
} else { |
| 234 |
mask = VisualClassMask; |
| 235 |
} |
| 236 |
} |
| 237 |
|
| 238 |
/* |
| 239 |
* Find all visuals that match the template we've just created, |
| 240 |
* and return an error if there are none that match. |
| 241 |
*/ |
| 242 |
|
| 243 |
template.screen = Tk_ScreenNumber(tkwin); |
| 244 |
mask |= VisualScreenMask; |
| 245 |
visInfoList = XGetVisualInfo(Tk_Display(tkwin), mask, &template, |
| 246 |
&numVisuals); |
| 247 |
if (visInfoList == NULL) { |
| 248 |
Tcl_SetResult(interp, "couldn't find an appropriate visual", |
| 249 |
TCL_STATIC); |
| 250 |
return NULL; |
| 251 |
} |
| 252 |
|
| 253 |
/* |
| 254 |
* Search through the visuals that were returned to find the best |
| 255 |
* one. The choice is based on the following criteria, in decreasing |
| 256 |
* order of importance: |
| 257 |
* |
| 258 |
* 1. Depth: choose a visual with exactly the desired depth, |
| 259 |
* else one with more bits than requested but as few bits |
| 260 |
* as possible, else one with fewer bits but as many as |
| 261 |
* possible. |
| 262 |
* 2. Class: some visual classes are more desirable than others; |
| 263 |
* pick the visual with the most desirable class. |
| 264 |
* 3. Default: the default visual for the screen gets preference |
| 265 |
* over other visuals, all else being equal. |
| 266 |
*/ |
| 267 |
|
| 268 |
bestPrio = 0; |
| 269 |
bestPtr = NULL; |
| 270 |
for (i = 0; i < numVisuals; i++) { |
| 271 |
switch (visInfoList[i].class) { |
| 272 |
case DirectColor: prio = 5; break; |
| 273 |
case GrayScale: prio = 1; break; |
| 274 |
case PseudoColor: prio = 7; break; |
| 275 |
case StaticColor: prio = 3; break; |
| 276 |
case StaticGray: prio = 1; break; |
| 277 |
case TrueColor: prio = 5; break; |
| 278 |
default: prio = 0; break; |
| 279 |
} |
| 280 |
if (visInfoList[i].visual |
| 281 |
== DefaultVisualOfScreen(Tk_Screen(tkwin))) { |
| 282 |
prio++; |
| 283 |
} |
| 284 |
if (bestPtr == NULL) { |
| 285 |
goto newBest; |
| 286 |
} |
| 287 |
if (visInfoList[i].depth < bestPtr->depth) { |
| 288 |
if (visInfoList[i].depth >= template.depth) { |
| 289 |
goto newBest; |
| 290 |
} |
| 291 |
} else if (visInfoList[i].depth > bestPtr->depth) { |
| 292 |
if (bestPtr->depth < template.depth) { |
| 293 |
goto newBest; |
| 294 |
} |
| 295 |
} else { |
| 296 |
if (prio > bestPrio) { |
| 297 |
goto newBest; |
| 298 |
} |
| 299 |
} |
| 300 |
continue; |
| 301 |
|
| 302 |
newBest: |
| 303 |
bestPtr = &visInfoList[i]; |
| 304 |
bestPrio = prio; |
| 305 |
} |
| 306 |
*depthPtr = bestPtr->depth; |
| 307 |
visual = bestPtr->visual; |
| 308 |
XFree((char *) visInfoList); |
| 309 |
|
| 310 |
/* |
| 311 |
* If we need to find a colormap for this visual, do it now. |
| 312 |
* If the visual is the default visual for the screen, then |
| 313 |
* use the default colormap. Otherwise search for an existing |
| 314 |
* colormap that's shareable. If all else fails, create a new |
| 315 |
* colormap. |
| 316 |
*/ |
| 317 |
|
| 318 |
if (colormapPtr != NULL) { |
| 319 |
if (visual == DefaultVisualOfScreen(Tk_Screen(tkwin))) { |
| 320 |
*colormapPtr = DefaultColormapOfScreen(Tk_Screen(tkwin)); |
| 321 |
} else { |
| 322 |
for (cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL; |
| 323 |
cmapPtr = cmapPtr->nextPtr) { |
| 324 |
if (cmapPtr->shareable && (cmapPtr->visual == visual)) { |
| 325 |
*colormapPtr = cmapPtr->colormap; |
| 326 |
cmapPtr->refCount += 1; |
| 327 |
goto done; |
| 328 |
} |
| 329 |
} |
| 330 |
cmapPtr = (TkColormap *) ckalloc(sizeof(TkColormap)); |
| 331 |
cmapPtr->colormap = XCreateColormap(Tk_Display(tkwin), |
| 332 |
RootWindowOfScreen(Tk_Screen(tkwin)), visual, |
| 333 |
AllocNone); |
| 334 |
cmapPtr->visual = visual; |
| 335 |
cmapPtr->refCount = 1; |
| 336 |
cmapPtr->shareable = 1; |
| 337 |
cmapPtr->nextPtr = dispPtr->cmapPtr; |
| 338 |
dispPtr->cmapPtr = cmapPtr; |
| 339 |
*colormapPtr = cmapPtr->colormap; |
| 340 |
} |
| 341 |
} |
| 342 |
|
| 343 |
done: |
| 344 |
return visual; |
| 345 |
} |
| 346 |
|
| 347 |
/* |
| 348 |
*---------------------------------------------------------------------- |
| 349 |
* |
| 350 |
* Tk_GetColormap -- |
| 351 |
* |
| 352 |
* Given a string identifying a colormap, this procedure finds |
| 353 |
* an appropriate colormap. |
| 354 |
* |
| 355 |
* Results: |
| 356 |
* The return value is normally the X resource identifier for the |
| 357 |
* colormap. If an error occurs, None is returned and an error |
| 358 |
* message is placed in the interp's result. |
| 359 |
* |
| 360 |
* Side effects: |
| 361 |
* A reference count is incremented for the colormap, so |
| 362 |
* Tk_FreeColormap must eventually be called exactly once for |
| 363 |
* each call to Tk_GetColormap. |
| 364 |
* |
| 365 |
*---------------------------------------------------------------------- |
| 366 |
*/ |
| 367 |
|
| 368 |
Colormap |
| 369 |
Tk_GetColormap(interp, tkwin, string) |
| 370 |
Tcl_Interp *interp; /* Interpreter to use for error |
| 371 |
* reporting. */ |
| 372 |
Tk_Window tkwin; /* Window where colormap will be |
| 373 |
* used. */ |
| 374 |
char *string; /* String that identifies colormap: |
| 375 |
* either "new" or the name of |
| 376 |
* another window. */ |
| 377 |
{ |
| 378 |
Colormap colormap; |
| 379 |
TkColormap *cmapPtr; |
| 380 |
TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr; |
| 381 |
Tk_Window other; |
| 382 |
|
| 383 |
/* |
| 384 |
* Allocate a new colormap, if that's what is wanted. |
| 385 |
*/ |
| 386 |
|
| 387 |
if (strcmp(string, "new") == 0) { |
| 388 |
cmapPtr = (TkColormap *) ckalloc(sizeof(TkColormap)); |
| 389 |
cmapPtr->colormap = XCreateColormap(Tk_Display(tkwin), |
| 390 |
RootWindowOfScreen(Tk_Screen(tkwin)), Tk_Visual(tkwin), |
| 391 |
AllocNone); |
| 392 |
cmapPtr->visual = Tk_Visual(tkwin); |
| 393 |
cmapPtr->refCount = 1; |
| 394 |
cmapPtr->shareable = 0; |
| 395 |
cmapPtr->nextPtr = dispPtr->cmapPtr; |
| 396 |
dispPtr->cmapPtr = cmapPtr; |
| 397 |
return cmapPtr->colormap; |
| 398 |
} |
| 399 |
|
| 400 |
/* |
| 401 |
* Use a colormap from an existing window. It must have the same |
| 402 |
* visual as tkwin (which means, among other things, that the |
| 403 |
* other window must be on the same screen). |
| 404 |
*/ |
| 405 |
|
| 406 |
other = Tk_NameToWindow(interp, string, tkwin); |
| 407 |
if (other == NULL) { |
| 408 |
return None; |
| 409 |
} |
| 410 |
if (Tk_Screen(other) != Tk_Screen(tkwin)) { |
| 411 |
Tcl_AppendResult(interp, "can't use colormap for ", string, |
| 412 |
": not on same screen", (char *) NULL); |
| 413 |
return None; |
| 414 |
} |
| 415 |
if (Tk_Visual(other) != Tk_Visual(tkwin)) { |
| 416 |
Tcl_AppendResult(interp, "can't use colormap for ", string, |
| 417 |
": incompatible visuals", (char *) NULL); |
| 418 |
return None; |
| 419 |
} |
| 420 |
colormap = Tk_Colormap(other); |
| 421 |
|
| 422 |
/* |
| 423 |
* If the colormap was a special one allocated by code in this file, |
| 424 |
* increment its reference count. |
| 425 |
*/ |
| 426 |
|
| 427 |
for (cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL; |
| 428 |
cmapPtr = cmapPtr->nextPtr) { |
| 429 |
if (cmapPtr->colormap == colormap) { |
| 430 |
cmapPtr->refCount += 1; |
| 431 |
} |
| 432 |
} |
| 433 |
return colormap; |
| 434 |
} |
| 435 |
|
| 436 |
/* |
| 437 |
*---------------------------------------------------------------------- |
| 438 |
* |
| 439 |
* Tk_FreeColormap -- |
| 440 |
* |
| 441 |
* This procedure is called to release a colormap that was |
| 442 |
* previously allocated by Tk_GetColormap. |
| 443 |
* |
| 444 |
* Results: |
| 445 |
* None. |
| 446 |
* |
| 447 |
* Side effects: |
| 448 |
* The colormap's reference count is decremented. If this was the |
| 449 |
* last reference to the colormap, then the colormap is freed. |
| 450 |
* |
| 451 |
*---------------------------------------------------------------------- |
| 452 |
*/ |
| 453 |
|
| 454 |
void |
| 455 |
Tk_FreeColormap(display, colormap) |
| 456 |
Display *display; /* Display for which colormap was |
| 457 |
* allocated. */ |
| 458 |
Colormap colormap; /* Colormap that is no longer needed. |
| 459 |
* Must have been returned by previous |
| 460 |
* call to Tk_GetColormap, or |
| 461 |
* preserved by a previous call to |
| 462 |
* Tk_PreserveColormap. */ |
| 463 |
{ |
| 464 |
TkDisplay *dispPtr; |
| 465 |
TkColormap *cmapPtr, *prevPtr; |
| 466 |
|
| 467 |
/* |
| 468 |
* Find Tk's information about the display, then see if this |
| 469 |
* colormap is a non-default one (if it's a default one, there |
| 470 |
* won't be an entry for it in the display's list). |
| 471 |
*/ |
| 472 |
|
| 473 |
dispPtr = TkGetDisplay(display); |
| 474 |
if (dispPtr == NULL) { |
| 475 |
panic("unknown display passed to Tk_FreeColormap"); |
| 476 |
} |
| 477 |
for (prevPtr = NULL, cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL; |
| 478 |
prevPtr = cmapPtr, cmapPtr = cmapPtr->nextPtr) { |
| 479 |
if (cmapPtr->colormap == colormap) { |
| 480 |
cmapPtr->refCount -= 1; |
| 481 |
if (cmapPtr->refCount == 0) { |
| 482 |
XFreeColormap(display, colormap); |
| 483 |
if (prevPtr == NULL) { |
| 484 |
dispPtr->cmapPtr = cmapPtr->nextPtr; |
| 485 |
} else { |
| 486 |
prevPtr->nextPtr = cmapPtr->nextPtr; |
| 487 |
} |
| 488 |
ckfree((char *) cmapPtr); |
| 489 |
} |
| 490 |
return; |
| 491 |
} |
| 492 |
} |
| 493 |
} |
| 494 |
|
| 495 |
/* |
| 496 |
*---------------------------------------------------------------------- |
| 497 |
* |
| 498 |
* Tk_PreserveColormap -- |
| 499 |
* |
| 500 |
* This procedure is called to indicate to Tk that the specified |
| 501 |
* colormap is being referenced from another location and should |
| 502 |
* not be freed until all extra references are eliminated. The |
| 503 |
* colormap must have been returned by Tk_GetColormap. |
| 504 |
* |
| 505 |
* Results: |
| 506 |
* None. |
| 507 |
* |
| 508 |
* Side effects: |
| 509 |
* The colormap's reference count is incremented, so |
| 510 |
* Tk_FreeColormap must eventually be called exactly once for |
| 511 |
* each call to Tk_PreserveColormap. |
| 512 |
* |
| 513 |
*---------------------------------------------------------------------- |
| 514 |
*/ |
| 515 |
|
| 516 |
void |
| 517 |
Tk_PreserveColormap(display, colormap) |
| 518 |
Display *display; /* Display for which colormap was |
| 519 |
* allocated. */ |
| 520 |
Colormap colormap; /* Colormap that should be |
| 521 |
* preserved. */ |
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{ |
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TkDisplay *dispPtr; |
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TkColormap *cmapPtr; |
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|
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/* |
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* Find Tk's information about the display, then see if this |
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* colormap is a non-default one (if it's a default one, there |
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* won't be an entry for it in the display's list). |
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*/ |
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|
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dispPtr = TkGetDisplay(display); |
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if (dispPtr == NULL) { |
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panic("unknown display passed to Tk_PreserveColormap"); |
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} |
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for (cmapPtr = dispPtr->cmapPtr; cmapPtr != NULL; |
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cmapPtr = cmapPtr->nextPtr) { |
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if (cmapPtr->colormap == colormap) { |
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cmapPtr->refCount += 1; |
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return; |
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} |
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} |
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} |
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|
| 545 |
/* End of tkvisual.c */ |
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