Actual source code: xcolor.c

  1: #define PETSC_DLL

  3: /*
  4:     Code for managing color the X implementation of the PetscDraw routines.

  6:     Currently we default to using cmapping[0 to PETSC_DRAW_BASIC_COLORS-1] for the basic colors and 
  7:   cmapping[DRAW_BASIC_COLORS to 255] for a uniform hue of all the colors. But in the contour
  8:   plot we only use from PETSC_DRAW_BASIC_COLORS to 240 since the ones beyond that are too dark.

 10: */
 11:  #include ../src/sys/draw/impls/x/ximpl.h
 12: #include <X11/Xatom.h>

 14: static const char *(colornames[PETSC_DRAW_BASIC_COLORS]) = { "white",
 15:                                                  "black",
 16:                                                  "red",
 17:                                                  "green",
 18:                                                  "cyan",
 19:                                                  "blue",
 20:                                                  "magenta",
 21:                                                  "aquamarine",
 22:                                                  "forestgreen",
 23:                                                  "orange",
 24:                                                  "violet",
 25:                                                  "brown",
 26:                                                  "pink",
 27:                                                  "coral",
 28:                                                  "gray",
 29:                                                  "yellow",
 30:                                                  "gold",
 31:                                                  "lightpink",
 32:                                                  "mediumturquoise",
 33:                                                  "khaki",
 34:                                                  "dimgray",
 35:                                                  "yellowgreen",
 36:                                                  "skyblue",
 37:                                                  "darkgreen",
 38:                                                  "navyblue",
 39:                                                  "sandybrown",
 40:                                                  "cadetblue",
 41:                                                  "powderblue",
 42:                                                  "deeppink",
 43:                                                  "thistle",
 44:                                                  "limegreen",
 45:                                                  "lavenderblush",
 46:                                                  "plum"};

 48: EXTERN PetscErrorCode XiInitCmap(PetscDraw_X*);
 49: EXTERN PetscErrorCode XiGetVisualClass(PetscDraw_X *);

 51: /*
 52:    Sets up a color map for a display. This is shared by all the windows
 53:   opened on that display; this is to save time when windows are open so 
 54:   each one does not have to create its own color map which can take 15 to 20 seconds

 56:      This is new code written 2/26/1999 Barry Smith,I hope it can replace
 57:   some older,rather confusing code.

 59:      The calls to XAllocNamedColor() and XAllocColor() are very slow 
 60:      because we have to request from the X server for each
 61:      color. Could not figure out a way to request a large number at the
 62:      same time.

 64:    IMPORTANT: this code will fail if user opens windows on two different 
 65:   displays: should add error checking to detect this. This is because all windows
 66:   share the same gColormap and gCmapping.

 68: */
 69: static Colormap  gColormap  = 0;
 70: static PixVal    gCmapping[256];
 71:        int       gNumcolors = 0;

 75: PetscErrorCode PetscDrawSetUpColormap_Shared(Display *display,int screen,Visual *visual,Colormap colormap)
 76: {
 77:   XColor         colordef,ecolordef;
 78:   unsigned char *red,*green,*blue;
 79:   int            i,ncolors;
 81:   PetscTruth     fast = PETSC_FALSE;

 84:   if (colormap) {
 85:     gColormap = colormap;
 86:   } else {
 87:     gColormap   = DefaultColormap(display,screen);
 88:   }

 90:   /* set the basic colors into the color map */
 91:   for (i=0; i<PETSC_DRAW_BASIC_COLORS; i++) {
 92:     XAllocNamedColor(display,gColormap,colornames[i],&colordef,&ecolordef);
 93:     gCmapping[i] = colordef.pixel;
 94:   }

 96:   /* set the uniform hue colors into the color map */
 97:   ncolors = 256-PETSC_DRAW_BASIC_COLORS;
 98:   PetscMalloc3(ncolors,unsigned char,&red,ncolors,unsigned char,&green,ncolors,unsigned char,&blue);
 99:   PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
100:   PetscOptionsGetTruth(PETSC_NULL,"-draw_fast",&fast,PETSC_NULL);
101:   if (!fast) {
102:     for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
103:       colordef.red    = ((int)red[i-PETSC_DRAW_BASIC_COLORS]   * 65535) / 255;
104:       colordef.green  = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
105:       colordef.blue   = ((int)blue[i-PETSC_DRAW_BASIC_COLORS]  * 65535) / 255;
106:       colordef.flags  = DoRed | DoGreen | DoBlue;
107:       XAllocColor(display,gColormap,&colordef);
108:       gCmapping[i]   = colordef.pixel;
109:     }
110:   }
111:   PetscFree3(red,green,blue);
112:   PetscInfo(0,"Successfully allocated colors\n");
113:   return(0);
114: }

116: /*
117:     Keep a record of which pixel numbers in the cmap have been 
118:   used so far; this is to allow us to try to reuse as much of the current
119:   colormap as possible.
120: */
121: static PetscTruth cmap_pixvalues_used[256];
122: static int        cmap_base = 0;

126: PetscErrorCode PetscDrawSetUpColormap_Private(Display *display,int screen,Visual *visual,Colormap colormap)
127: {
128:   Colormap      defaultmap = DefaultColormap(display,screen);
130:   int           found,i,ncolors;
131:   XColor        colordef;
132:   unsigned char *red,*green,*blue;
133:   PetscTruth    fast = PETSC_FALSE;


137:   if (colormap) {
138:     gColormap = colormap;
139:   } else {
140:     gColormap = XCreateColormap(display,RootWindow(display,screen),visual,AllocAll);
141:   }

143:   cmap_base = 0;
144:   PetscMemzero(cmap_pixvalues_used,256*sizeof(PetscTruth));

146:   /* set the basic colors into the color map */
147:   for (i=0; i<PETSC_DRAW_BASIC_COLORS; i++) {
148:     XParseColor(display,gColormap,colornames[i],&colordef);
149:       /* try to allocate the color in the default-map */
150:     found = XAllocColor(display,defaultmap,&colordef);
151:     /* use it, if it it exists and is not already used in the new colormap */
152:     if (found && colordef.pixel < 256  && !cmap_pixvalues_used[colordef.pixel]) {
153:       cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
154:     /* otherwise search for the next available slot */
155:     } else {
156:       while (cmap_pixvalues_used[cmap_base]) cmap_base++;
157:       colordef.pixel                   = cmap_base;
158:       cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
159:     }
160:     XStoreColor(display,gColormap,&colordef);
161:     gCmapping[i] = colordef.pixel;
162:   }

164:   /* set the uniform hue colors into the color map */
165:   ncolors = 256-PETSC_DRAW_BASIC_COLORS;
166:   PetscMalloc3(ncolors,unsigned char,&red,ncolors,unsigned char,&green,ncolors,unsigned char,&blue);
167:   PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
168:   PetscOptionsGetTruth(PETSC_NULL,"-draw_fast",&fast,PETSC_NULL);
169:   if (!fast) {
170:     for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
171:       colordef.red    = ((int)red[i-PETSC_DRAW_BASIC_COLORS]   * 65535) / 255;
172:       colordef.green  = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
173:       colordef.blue   = ((int)blue[i-PETSC_DRAW_BASIC_COLORS]  * 65535) / 255;
174:       colordef.flags  = DoRed | DoGreen | DoBlue;
175:       /* try to allocate the color in the default-map */
176:       found = XAllocColor(display,defaultmap,&colordef);
177:       /* use it, if it it exists and is not already used in the new colormap */
178:       if (found && colordef.pixel < 256  && !cmap_pixvalues_used[colordef.pixel]) {
179:         cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
180:         /* otherwise search for the next available slot */
181:       } else {
182:         while (cmap_pixvalues_used[cmap_base]) cmap_base++;
183:         colordef.pixel                   = cmap_base;
184:         cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
185:       }
186:       XStoreColor(display,gColormap,&colordef);
187:       gCmapping[i]   = colordef.pixel;
188:     }
189:   }
190:   PetscFree3(red,green,blue);
191:   PetscInfo(0,"Successfully allocated colors\n");
192:   return(0);
193: }

197: PetscErrorCode PetscDrawSetUpColormap_X(Display *display,int screen,Visual *visual,Colormap colormap)
198: {
200:   PetscTruth     sharedcolormap = PETSC_FALSE;
201:   XVisualInfo    vinfo;


205:   /* 
206:      This is wrong; it needs to take the value from the visual 
207:   */
208:   gNumcolors = 1 << DefaultDepth(display,screen);

210:   PetscOptionsGetTruth(PETSC_NULL,"-draw_x_shared_colormap",&sharedcolormap,PETSC_NULL);
211:   /*
212:         Need to determine if window supports allocating a private colormap,
213:     if not, set flag to 1
214:   */
215:   if (XMatchVisualInfo(display,screen,24,StaticColor,&vinfo) ||
216:       XMatchVisualInfo(display,screen,24,TrueColor,&vinfo)   ||
217:       XMatchVisualInfo(display,screen,16,StaticColor,&vinfo) ||
218:       XMatchVisualInfo(display,screen,16,TrueColor,&vinfo)   ||
219:       XMatchVisualInfo(display,screen,15,StaticColor,&vinfo) ||
220:       XMatchVisualInfo(display,screen,15,TrueColor,&vinfo)) {
221:     sharedcolormap = PETSC_TRUE;
222:   }

224:   /* generate the X color map object */
225:   if (sharedcolormap) {
226:     PetscDrawSetUpColormap_Shared(display,screen,visual,colormap);
227:   } else {
228:     PetscDrawSetUpColormap_Private(display,screen,visual,colormap);
229:   }
230: 
231:   return(0);
232: }

236: PetscErrorCode PetscDrawSetColormap_X(PetscDraw_X* XiWin,char *host,Colormap colormap)
237: {

241:   if (XiWin->depth < 8) {
242:     SETERRQ(PETSC_ERR_SUP_SYS,"PETSc Graphics require monitors with at least 8 bit color (256 colors)");
243:   }
244:   if (!gColormap){
245:     Display  *display;  /* Private display will exist forever contains colormap shared by all windows */
246:     int      screen;
247:     Visual*  vis;

249:     display = XOpenDisplay(host);
250:     screen  = DefaultScreen(display);
251:     vis     = DefaultVisual(display,screen);

253:     PetscDrawSetUpColormap_X(display,screen,vis,colormap);
254:   }
255:   XiWin->cmap = gColormap;
256:   PetscMemcpy(XiWin->cmapping,gCmapping,256*sizeof(PixVal));
257:   XiWin->background = XiWin->cmapping[PETSC_DRAW_WHITE];
258:   XiWin->foreground = XiWin->cmapping[PETSC_DRAW_BLACK];
259:   return(0);
260: }

262: /*
263:     Color in X is many-layered.  The first layer is the "visual",a
264:     immutable attribute of a window set when the window is
265:     created.

267:     The next layer is the colormap.  The installation of colormaps is
268:     the buisness of the window manager (in some distant later release).
269: */

271: /*
272:     This routine gets the visual class (PseudoColor, etc) and returns
273:     it.  It finds the default visual.  Possible returns are
274:         PseudoColor
275:         StaticColor
276:         DirectColor
277:         TrueColor
278:         GrayScale
279:         StaticGray
280:  */
283: PetscErrorCode XiSetVisualClass(PetscDraw_X* XiWin)
284: {
285:   XVisualInfo vinfo;

288:   if (XMatchVisualInfo(XiWin->disp,XiWin->screen,24,DirectColor,&vinfo)) {
289:     XiWin->vis    = vinfo.visual;
290:     return(0);
291:   }
292:   if (XMatchVisualInfo(XiWin->disp,XiWin->screen,8,PseudoColor,&vinfo)) {
293:     XiWin->vis    = vinfo.visual;
294:     return(0);
295:   }
296:   if (XMatchVisualInfo(XiWin->disp,XiWin->screen,
297:     DefaultDepth(XiWin->disp,XiWin->screen),PseudoColor,&vinfo)) {
298:     XiWin->vis    = vinfo.visual;
299:     return(0);
300:   }
301:   XiWin->vis    = DefaultVisual(XiWin->disp,XiWin->screen);
302:   return(0);
303: }

307: PetscErrorCode XiGetVisualClass(PetscDraw_X* XiWin)
308: {
310: #if defined(__cplusplus)
311:   PetscFunctionReturn(XiWin->vis->c_class);
312: #else
313:   PetscFunctionReturn(XiWin->vis->class);
314: #endif
315: }


320: PetscErrorCode XiSetColormap(PetscDraw_X* XiWin)
321: {
323:   XSetWindowColormap(XiWin->disp,XiWin->win,XiWin->cmap);
324:   return(0);
325: }

329: PetscErrorCode XiGetBaseColor(PetscDraw_X* XiWin,PixVal* white_pix,PixVal* black_pix)
330: {
332:   *white_pix  = XiWin->cmapping[PETSC_DRAW_WHITE];
333:   *black_pix  = XiWin->cmapping[PETSC_DRAW_BLACK];
334:   return(0);
335: }



339: /*
340:     This routine returns the pixel value for the specified color
341:     Returns 0 on failure,<>0 otherwise.
342:  */
345: PetscErrorCode XiFindColor(PetscDraw_X *XiWin,char *name,PixVal *pixval)
346: {
347:   XColor   colordef;
348:   int      st;

351:   st = XParseColor(XiWin->disp,XiWin->cmap,name,&colordef);
352:   if (st) {
353:     st  = XAllocColor(XiWin->disp,XiWin->cmap,&colordef);
354:     if (st)  *pixval = colordef.pixel;
355:   }
356:   PetscFunctionReturn(st);
357: }

359: /*
360:     Another real need is to assign "colors" that make sense for
361:     a monochrome display,without unduely penalizing color displays.
362:     This routine takes a color name,a window, and a flag that
363:     indicates whether this is "background" or "foreground".
364:     In the monchrome case (or if the color is otherwise unavailable),
365:     the "background" or "foreground" colors will be chosen
366:  */
369: PixVal XiGetColor(PetscDraw_X* XiWin,char *name,int is_fore)
370: {
371:   PixVal pixval;

374:   if (XiWin->numcolors == 2 || !XiFindColor(XiWin,name,&pixval)) {
375:     pixval  = is_fore ? XiWin->cmapping[PETSC_DRAW_WHITE] : XiWin->cmapping[PETSC_DRAW_BLACK];
376:   }
377:   PetscFunctionReturn(pixval);
378: }

380: /*
381:    This routine takes a named color and returns a color that is either
382:    lighter or darker
383:  */
386: PixVal XiSimColor(PetscDraw_X *XiWin,PixVal pixel,int intensity,int is_fore)
387: {
388:   XColor   colordef,colorsdef;
389:   char     RGBcolor[20];
390:   PixVal   red,green,blue;

393:   colordef.pixel = pixel;
394:   XQueryColor(XiWin->disp,XiWin->cmap,&colordef);
395:   /* Adjust the color value up or down.  Get the RGB values for the color */
396:   red   = colordef.red;
397:   green = colordef.green;
398:   blue  = colordef.blue;
399: #define WHITE_AMOUNT 5000
400:   if (intensity > 0) {
401:     /* Add white to the color */
402:     red   = PetscMin(65535,red + WHITE_AMOUNT);
403:     green = PetscMin(65535,green + WHITE_AMOUNT);
404:     blue  = PetscMin(65535,blue + WHITE_AMOUNT);
405:   } else {
406:     /* Subtract white from the color */
407:     red   = (red   < WHITE_AMOUNT) ? 0 : red - WHITE_AMOUNT;
408:     green = (green < WHITE_AMOUNT) ? 0 : green - WHITE_AMOUNT;
409:     blue  = (blue  < WHITE_AMOUNT) ? 0 : blue - WHITE_AMOUNT;
410:   }
411:   sprintf(RGBcolor,"rgb:%4.4x/%4.4x/%4.4x",(unsigned int)red,
412:                      (unsigned int)green,(unsigned int)blue);
413:   XLookupColor(XiWin->disp,XiWin->cmap,RGBcolor,&colordef,&colorsdef);
414:   PetscFunctionReturn(colorsdef.pixel);
415: }

417: /*
418:   XiSetCmapLight - Create rgb values from a single color by adding white
419:   
420:   The initial color is (red[0],green[0],blue[0]).
421: */
424: PetscErrorCode XiSetCmapLight(unsigned char *red,unsigned char *green,unsigned char *blue,int mapsize)
425: {
426:   int     i ;

429:   for (i=1; i<mapsize-1; i++) {
430:       blue[i]  = i*(255-(int)blue[0])/(mapsize-2)+blue[0] ;
431:       green[i] = i*(255-(int)green[0])/(mapsize-2)+green[0] ;
432:       red[i]   = i*(255-(int)red[0])/(mapsize-2)+red[0] ;
433:   }
434:   red[mapsize-1] = green[mapsize-1] = blue[mapsize-1] = 255;
435:   return(0);
436: }