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/src/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;

 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:   PetscMalloc(3*ncolors*sizeof(unsigned char),&red);
 99:   green   = red   + ncolors;
100:   blue    = green + ncolors;
101:   PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
102:   PetscOptionsHasName(PETSC_NULL,"-draw_fast",&fast);
103:   if (!fast) {
104:     for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
105:       colordef.red    = ((int)red[i-PETSC_DRAW_BASIC_COLORS]   * 65535) / 255;
106:       colordef.green  = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
107:       colordef.blue   = ((int)blue[i-PETSC_DRAW_BASIC_COLORS]  * 65535) / 255;
108:       colordef.flags  = DoRed | DoGreen | DoBlue;
109:       XAllocColor(display,gColormap,&colordef);
110:       gCmapping[i]   = colordef.pixel;
111:     }
112:   }
113:   PetscFree(red);
114:   PetscLogInfo((0,"PetscDrawSetUpColormap_Shared:Successfully allocated colors\n"));

116:   return(0);
117: }

119: /*
120:     Keep a record of which pixel numbers in the cmap have been 
121:   used so far; this is to allow us to try to reuse as much of the current
122:   colormap as possible.
123: */
124: static PetscTruth cmap_pixvalues_used[256];
125: static int        cmap_base = 0;

129: PetscErrorCode PetscDrawSetUpColormap_Private(Display *display,int screen,Visual *visual,Colormap colormap)
130: {
131:   Colormap      defaultmap = DefaultColormap(display,screen);
133:   int           found,i,ncolors;
134:   XColor        colordef;
135:   unsigned char *red,*green,*blue;
136:   PetscTruth    fast;


140:   if (colormap) {
141:     gColormap = colormap;
142:   } else {
143:     gColormap = XCreateColormap(display,RootWindow(display,screen),visual,AllocAll);
144:   }

146:   cmap_base = 0;
147:   PetscMemzero(cmap_pixvalues_used,256*sizeof(PetscTruth));

149:   /* set the basic colors into the color map */
150:   for (i=0; i<PETSC_DRAW_BASIC_COLORS; i++) {
151:     XParseColor(display,gColormap,colornames[i],&colordef);
152:       /* try to allocate the color in the default-map */
153:     found = XAllocColor(display,defaultmap,&colordef);
154:     /* use it, if it it exists and is not already used in the new colormap */
155:     if (found && colordef.pixel < 256  && !cmap_pixvalues_used[colordef.pixel]) {
156:       cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
157:     /* otherwise search for the next available slot */
158:     } else {
159:       while (cmap_pixvalues_used[cmap_base]) cmap_base++;
160:       colordef.pixel                   = cmap_base;
161:       cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
162:     }
163:     XStoreColor(display,gColormap,&colordef);
164:     gCmapping[i] = colordef.pixel;
165:   }

167:   /* set the uniform hue colors into the color map */
168:   ncolors = 256-PETSC_DRAW_BASIC_COLORS;
169:   PetscMalloc(3*ncolors*sizeof(unsigned char),&red);
170:   green   = red   + ncolors;
171:   blue    = green + ncolors;
172:   PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
173:   PetscOptionsHasName(PETSC_NULL,"-draw_fast",&fast);
174:   if (!fast) {
175:     for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
176:       colordef.red    = ((int)red[i-PETSC_DRAW_BASIC_COLORS]   * 65535) / 255;
177:       colordef.green  = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
178:       colordef.blue   = ((int)blue[i-PETSC_DRAW_BASIC_COLORS]  * 65535) / 255;
179:       colordef.flags  = DoRed | DoGreen | DoBlue;
180:       /* try to allocate the color in the default-map */
181:       found = XAllocColor(display,defaultmap,&colordef);
182:       /* use it, if it it exists and is not already used in the new colormap */
183:       if (found && colordef.pixel < 256  && !cmap_pixvalues_used[colordef.pixel]) {
184:         cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
185:         /* otherwise search for the next available slot */
186:       } else {
187:         while (cmap_pixvalues_used[cmap_base]) cmap_base++;
188:         colordef.pixel                   = cmap_base;
189:         cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
190:       }
191:       XStoreColor(display,gColormap,&colordef);
192:       gCmapping[i]   = colordef.pixel;
193:     }
194:   }
195:   PetscFree(red);
196:   PetscLogInfo((0,"PetscDrawSetUpColormap_Private:Successfully allocated colors\n"));
197:   return(0);
198: }

202: PetscErrorCode PetscDrawSetUpColormap_X(Display *display,int screen,Visual *visual,Colormap colormap)
203: {
205:   PetscTruth  sharedcolormap;
206:   XVisualInfo vinfo;


210:   /* 
211:      This is wrong; it needs to take the value from the visual 
212:   */
213:   gNumcolors = 1 << DefaultDepth(display,screen);

215:   PetscOptionsHasName(PETSC_NULL,"-draw_x_shared_colormap",&sharedcolormap);
216:   /*
217:         Need to determine if window supports allocating a private colormap,
218:     if not, set flag to 1
219:   */
220:   if (XMatchVisualInfo(display,screen,24,StaticColor,&vinfo) ||
221:       XMatchVisualInfo(display,screen,24,TrueColor,&vinfo)   ||
222:       XMatchVisualInfo(display,screen,16,StaticColor,&vinfo) ||
223:       XMatchVisualInfo(display,screen,16,TrueColor,&vinfo)   ||
224:       XMatchVisualInfo(display,screen,15,StaticColor,&vinfo) ||
225:       XMatchVisualInfo(display,screen,15,TrueColor,&vinfo)) {
226:     sharedcolormap = PETSC_TRUE;
227:   }

229:   /* generate the X color map object */
230:   if (sharedcolormap) {
231:     PetscDrawSetUpColormap_Shared(display,screen,visual,colormap);
232:   } else {
233:     PetscDrawSetUpColormap_Private(display,screen,visual,colormap);
234:   }
235: 
236:   return(0);
237: }

241: PetscErrorCode PetscDrawSetColormap_X(PetscDraw_X* XiWin,char *host,Colormap colormap)
242: {

246:   if (XiWin->depth < 8) {
247:     SETERRQ(PETSC_ERR_SUP_SYS,"PETSc Graphics require monitors with at least 8 bit color (256 colors)");
248:   }
249:   if (!gColormap){
250:     Display  *display;  /* Private display will exist forever contains colormap shared by all windows */
251:     int      screen;
252:     Visual*  vis;

254:     display = XOpenDisplay(host);
255:     screen  = DefaultScreen(display);
256:     vis     = DefaultVisual(display,screen);

258:     PetscDrawSetUpColormap_X(display,screen,vis,colormap);
259:   }
260:   XiWin->cmap = gColormap;
261:   PetscMemcpy(XiWin->cmapping,gCmapping,256*sizeof(PixVal));
262:   XiWin->background = XiWin->cmapping[PETSC_DRAW_WHITE];
263:   XiWin->foreground = XiWin->cmapping[PETSC_DRAW_BLACK];
264:   return(0);
265: }

267: /*
268:     Color in X is many-layered.  The first layer is the "visual",a
269:     immutable attribute of a window set when the window is
270:     created.

272:     The next layer is the colormap.  The installation of colormaps is
273:     the buisness of the window manager (in some distant later release).
274: */

276: /*
277:     This routine gets the visual class (PseudoColor, etc) and returns
278:     it.  It finds the default visual.  Possible returns are
279:         PseudoColor
280:         StaticColor
281:         DirectColor
282:         TrueColor
283:         GrayScale
284:         StaticGray
285:  */
288: PetscErrorCode XiSetVisualClass(PetscDraw_X* XiWin)
289: {
290:   XVisualInfo vinfo;

293:   if (XMatchVisualInfo(XiWin->disp,XiWin->screen,24,DirectColor,&vinfo)) {
294:     XiWin->vis    = vinfo.visual;
295:     return(0);
296:   }
297:   if (XMatchVisualInfo(XiWin->disp,XiWin->screen,8,PseudoColor,&vinfo)) {
298:     XiWin->vis    = vinfo.visual;
299:     return(0);
300:   }
301:   if (XMatchVisualInfo(XiWin->disp,XiWin->screen,
302:     DefaultDepth(XiWin->disp,XiWin->screen),PseudoColor,&vinfo)) {
303:     XiWin->vis    = vinfo.visual;
304:     return(0);
305:   }
306:   XiWin->vis    = DefaultVisual(XiWin->disp,XiWin->screen);
307:   return(0);
308: }

312: PetscErrorCode XiGetVisualClass(PetscDraw_X* XiWin)
313: {
315: #if defined(__cplusplus)
316:   PetscFunctionReturn(XiWin->vis->c_class);
317: #else
318:   PetscFunctionReturn(XiWin->vis->class);
319: #endif
320: }


325: PetscErrorCode XiSetColormap(PetscDraw_X* XiWin)
326: {
328:   XSetWindowColormap(XiWin->disp,XiWin->win,XiWin->cmap);
329:   return(0);
330: }

334: PetscErrorCode XiGetBaseColor(PetscDraw_X* XiWin,PixVal* white_pix,PixVal* black_pix)
335: {
337:   *white_pix  = XiWin->cmapping[PETSC_DRAW_WHITE];
338:   *black_pix  = XiWin->cmapping[PETSC_DRAW_BLACK];
339:   return(0);
340: }



344: /*
345:     This routine returns the pixel value for the specified color
346:     Returns 0 on failure,<>0 otherwise.
347:  */
350: PetscErrorCode XiFindColor(PetscDraw_X *XiWin,char *name,PixVal *pixval)
351: {
352:   XColor   colordef;
353:   int      st;

356:   st = XParseColor(XiWin->disp,XiWin->cmap,name,&colordef);
357:   if (st) {
358:     st  = XAllocColor(XiWin->disp,XiWin->cmap,&colordef);
359:     if (st)  *pixval = colordef.pixel;
360:   }
361:   PetscFunctionReturn(st);
362: }

364: /*
365:     Another real need is to assign "colors" that make sense for
366:     a monochrome display,without unduely penalizing color displays.
367:     This routine takes a color name,a window, and a flag that
368:     indicates whether this is "background" or "foreground".
369:     In the monchrome case (or if the color is otherwise unavailable),
370:     the "background" or "foreground" colors will be chosen
371:  */
374: PixVal XiGetColor(PetscDraw_X* XiWin,char *name,int is_fore)
375: {
376:   PixVal pixval;

379:   if (XiWin->numcolors == 2 || !XiFindColor(XiWin,name,&pixval)) {
380:     pixval  = is_fore ? XiWin->cmapping[PETSC_DRAW_WHITE] : XiWin->cmapping[PETSC_DRAW_BLACK];
381:   }
382:   PetscFunctionReturn(pixval);
383: }

385: /*
386:    This routine takes a named color and returns a color that is either
387:    lighter or darker
388:  */
391: PixVal XiSimColor(PetscDraw_X *XiWin,PixVal pixel,int intensity,int is_fore)
392: {
393:   XColor   colordef,colorsdef;
394:   char     RGBcolor[20];
395:   PixVal   red,green,blue;

398:   colordef.pixel = pixel;
399:   XQueryColor(XiWin->disp,XiWin->cmap,&colordef);
400:   /* Adjust the color value up or down.  Get the RGB values for the color */
401:   red   = colordef.red;
402:   green = colordef.green;
403:   blue  = colordef.blue;
404: #define WHITE_AMOUNT 5000
405:   if (intensity > 0) {
406:     /* Add white to the color */
407:     red   = PetscMin(65535,red + WHITE_AMOUNT);
408:     green = PetscMin(65535,green + WHITE_AMOUNT);
409:     blue  = PetscMin(65535,blue + WHITE_AMOUNT);
410:   } else {
411:     /* Subtract white from the color */
412:     red   = (red   < WHITE_AMOUNT) ? 0 : red - WHITE_AMOUNT;
413:     green = (green < WHITE_AMOUNT) ? 0 : green - WHITE_AMOUNT;
414:     blue  = (blue  < WHITE_AMOUNT) ? 0 : blue - WHITE_AMOUNT;
415:   }
416:   sprintf(RGBcolor,"rgb:%4.4x/%4.4x/%4.4x",(unsigned int)red,
417:                      (unsigned int)green,(unsigned int)blue);
418:   XLookupColor(XiWin->disp,XiWin->cmap,RGBcolor,&colordef,&colorsdef);
419:   PetscFunctionReturn(colorsdef.pixel);
420: }

422: /*
423:   XiSetCmapLight - Create rgb values from a single color by adding white
424:   
425:   The initial color is (red[0],green[0],blue[0]).
426: */
429: PetscErrorCode XiSetCmapLight(unsigned char *red,unsigned char *green,unsigned char *blue,int mapsize)
430: {
431:   int     i ;

434:   for (i=1; i<mapsize-1; i++) {
435:       blue[i]  = i*(255-(int)blue[0])/(mapsize-2)+blue[0] ;
436:       green[i] = i*(255-(int)green[0])/(mapsize-2)+green[0] ;
437:       red[i]   = i*(255-(int)red[0])/(mapsize-2)+red[0] ;
438:   }
439:   red[mapsize-1] = green[mapsize-1] = blue[mapsize-1] = 255;
440:   return(0);
441: }