Actual source code: xcolor.c
1: /*$Id: xcolor.c,v 1.72 2001/03/23 23:20:15 balay Exp $*/
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 int XiInitCmap(PetscDraw_X*);
49: EXTERN int 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: int PetscDrawSetUpColormap_Shared(Display *display,int screen,Visual *visual,Colormap colormap)
76: {
77: XColor colordef,ecolordef;
78: unsigned char *red,*green,*blue;
79: int i,ierr,ncolors;
80: PetscTruth fast;
83: if (colormap) {
84: gColormap = colormap;
85: } else {
86: gColormap = DefaultColormap(display,screen);
87: }
89: /* set the basic colors into the color map */
90: for (i=0; i<PETSC_DRAW_BASIC_COLORS; i++) {
91: XAllocNamedColor(display,gColormap,colornames[i],&colordef,&ecolordef);
92: gCmapping[i] = colordef.pixel;
93: }
95: /* set the uniform hue colors into the color map */
96: ncolors = 256-PETSC_DRAW_BASIC_COLORS;
97: PetscMalloc(3*ncolors*sizeof(unsigned char),&red);
98: green = red + ncolors;
99: blue = green + ncolors;
100: PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
101: PetscOptionsHasName(PETSC_NULL,"-draw_fast",&fast);
102: if (!fast) {
103: for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
104: colordef.red = ((int)red[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
105: colordef.green = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
106: colordef.blue = ((int)blue[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
107: colordef.flags = DoRed | DoGreen | DoBlue;
108: XAllocColor(display,gColormap,&colordef);
109: gCmapping[i] = colordef.pixel;
110: }
111: }
112: PetscFree(red);
113: PetscLogInfo(0,"PetscDrawSetUpColormap_Shared:Successfully allocated colors\n");
115: return(0);
116: }
118: /*
119: Keep a record of which pixel numbers in the cmap have been
120: used so far; this is to allow us to try to reuse as much of the current
121: colormap as possible.
122: */
123: static PetscTruth cmap_pixvalues_used[256];
124: static int cmap_base = 0;
128: int PetscDrawSetUpColormap_Private(Display *display,int screen,Visual *visual,Colormap colormap)
129: {
130: Colormap defaultmap = DefaultColormap(display,screen);
131: int ierr,found,i,ncolors;
132: XColor colordef;
133: unsigned char *red,*green,*blue;
134: PetscTruth fast;
138: if (colormap) {
139: gColormap = colormap;
140: } else {
141: gColormap = XCreateColormap(display,RootWindow(display,screen),visual,AllocAll);
142: }
144: cmap_base = 0;
145: PetscMemzero(cmap_pixvalues_used,256*sizeof(PetscTruth));
147: /* set the basic colors into the color map */
148: for (i=0; i<PETSC_DRAW_BASIC_COLORS; i++) {
149: XParseColor(display,gColormap,colornames[i],&colordef);
150: /* try to allocate the color in the default-map */
151: found = XAllocColor(display,defaultmap,&colordef);
152: /* use it, if it it exists and is not already used in the new colormap */
153: if (found && colordef.pixel < 256 && !cmap_pixvalues_used[colordef.pixel]) {
154: cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
155: /* otherwise search for the next available slot */
156: } else {
157: while (cmap_pixvalues_used[cmap_base]) cmap_base++;
158: colordef.pixel = cmap_base;
159: cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
160: }
161: XStoreColor(display,gColormap,&colordef);
162: gCmapping[i] = colordef.pixel;
163: }
165: /* set the uniform hue colors into the color map */
166: ncolors = 256-PETSC_DRAW_BASIC_COLORS;
167: PetscMalloc(3*ncolors*sizeof(unsigned char),&red);
168: green = red + ncolors;
169: blue = green + ncolors;
170: PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
171: PetscOptionsHasName(PETSC_NULL,"-draw_fast",&fast);
172: if (!fast) {
173: for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
174: colordef.red = ((int)red[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
175: colordef.green = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
176: colordef.blue = ((int)blue[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
177: colordef.flags = DoRed | DoGreen | DoBlue;
178: /* try to allocate the color in the default-map */
179: found = XAllocColor(display,defaultmap,&colordef);
180: /* use it, if it it exists and is not already used in the new colormap */
181: if (found && colordef.pixel < 256 && !cmap_pixvalues_used[colordef.pixel]) {
182: cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
183: /* otherwise search for the next available slot */
184: } else {
185: while (cmap_pixvalues_used[cmap_base]) cmap_base++;
186: colordef.pixel = cmap_base;
187: cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
188: }
189: XStoreColor(display,gColormap,&colordef);
190: gCmapping[i] = colordef.pixel;
191: }
192: }
193: PetscFree(red);
194: PetscLogInfo(0,"PetscDrawSetUpColormap_Private:Successfully allocated colors\n");
195: return(0);
196: }
200: int PetscDrawSetUpColormap_X(Display *display,int screen,Visual *visual,Colormap colormap)
201: {
202: int ierr;
203: PetscTruth sharedcolormap;
204: XVisualInfo vinfo;
208: /*
209: This is wrong; it needs to take the value from the visual
210: */
211: gNumcolors = 1 << DefaultDepth(display,screen);
213: PetscOptionsHasName(PETSC_NULL,"-draw_x_shared_colormap",&sharedcolormap);
214: /*
215: Need to determine if window supports allocating a private colormap,
216: if not, set flag to 1
217: */
218: if (XMatchVisualInfo(display,screen,24,StaticColor,&vinfo) ||
219: XMatchVisualInfo(display,screen,24,TrueColor,&vinfo) ||
220: XMatchVisualInfo(display,screen,16,StaticColor,&vinfo) ||
221: XMatchVisualInfo(display,screen,16,TrueColor,&vinfo) ||
222: XMatchVisualInfo(display,screen,15,StaticColor,&vinfo) ||
223: XMatchVisualInfo(display,screen,15,TrueColor,&vinfo)) {
224: sharedcolormap = PETSC_TRUE;
225: }
227: /* generate the X color map object */
228: if (sharedcolormap) {
229: PetscDrawSetUpColormap_Shared(display,screen,visual,colormap);
230: } else {
231: PetscDrawSetUpColormap_Private(display,screen,visual,colormap);
232: }
233:
234: return(0);
235: }
239: int PetscDrawSetColormap_X(PetscDraw_X* XiWin,char *host,Colormap colormap)
240: {
244: if (XiWin->depth < 8) {
245: SETERRQ(1,"PETSc Graphics require monitors with at least 8 bit color (256 colors)");
246: }
247: if (!gColormap){
248: Display *display; /* Private display will exist forever contains colormap shared by all windows */
249: int screen;
250: Visual* vis;
252: display = XOpenDisplay(host);
253: screen = DefaultScreen(display);
254: vis = DefaultVisual(display,screen);
256: PetscDrawSetUpColormap_X(display,screen,vis,colormap);
257: }
258: XiWin->cmap = gColormap;
259: PetscMemcpy(XiWin->cmapping,gCmapping,256*sizeof(PixVal));
260: XiWin->background = XiWin->cmapping[PETSC_DRAW_WHITE];
261: XiWin->foreground = XiWin->cmapping[PETSC_DRAW_BLACK];
262: return(0);
263: }
265: /*
266: Color in X is many-layered. The first layer is the "visual",a
267: immutable attribute of a window set when the window is
268: created.
270: The next layer is the colormap. The installation of colormaps is
271: the buisness of the window manager (in some distant later release).
272: */
274: /*
275: This routine gets the visual class (PseudoColor, etc) and returns
276: it. It finds the default visual. Possible returns are
277: PseudoColor
278: StaticColor
279: DirectColor
280: TrueColor
281: GrayScale
282: StaticGray
283: */
286: int XiSetVisualClass(PetscDraw_X* XiWin)
287: {
288: XVisualInfo vinfo;
291: if (XMatchVisualInfo(XiWin->disp,XiWin->screen,24,DirectColor,&vinfo)) {
292: XiWin->vis = vinfo.visual;
293: return(0);
294: }
295: if (XMatchVisualInfo(XiWin->disp,XiWin->screen,8,PseudoColor,&vinfo)) {
296: XiWin->vis = vinfo.visual;
297: return(0);
298: }
299: if (XMatchVisualInfo(XiWin->disp,XiWin->screen,
300: DefaultDepth(XiWin->disp,XiWin->screen),PseudoColor,&vinfo)) {
301: XiWin->vis = vinfo.visual;
302: return(0);
303: }
304: XiWin->vis = DefaultVisual(XiWin->disp,XiWin->screen);
305: return(0);
306: }
310: int XiGetVisualClass(PetscDraw_X* XiWin)
311: {
313: #if defined(__cplusplus)
314: PetscFunctionReturn(XiWin->vis->c_class);
315: #else
316: PetscFunctionReturn(XiWin->vis->class);
317: #endif
318: }
323: int XiSetColormap(PetscDraw_X* XiWin)
324: {
326: XSetWindowColormap(XiWin->disp,XiWin->win,XiWin->cmap);
327: return(0);
328: }
332: int XiGetBaseColor(PetscDraw_X* XiWin,PixVal* white_pix,PixVal* black_pix)
333: {
335: *white_pix = XiWin->cmapping[PETSC_DRAW_WHITE];
336: *black_pix = XiWin->cmapping[PETSC_DRAW_BLACK];
337: return(0);
338: }
342: /*
343: This routine returns the pixel value for the specified color
344: Returns 0 on failure,<>0 otherwise.
345: */
348: int XiFindColor(PetscDraw_X *XiWin,char *name,PixVal *pixval)
349: {
350: XColor colordef;
351: int st;
354: st = XParseColor(XiWin->disp,XiWin->cmap,name,&colordef);
355: if (st) {
356: st = XAllocColor(XiWin->disp,XiWin->cmap,&colordef);
357: if (st) *pixval = colordef.pixel;
358: }
359: PetscFunctionReturn(st);
360: }
362: /*
363: Another real need is to assign "colors" that make sense for
364: a monochrome display,without unduely penalizing color displays.
365: This routine takes a color name,a window, and a flag that
366: indicates whether this is "background" or "foreground".
367: In the monchrome case (or if the color is otherwise unavailable),
368: the "background" or "foreground" colors will be chosen
369: */
372: PixVal XiGetColor(PetscDraw_X* XiWin,char *name,int is_fore)
373: {
374: PixVal pixval;
377: if (XiWin->numcolors == 2 || !XiFindColor(XiWin,name,&pixval)) {
378: pixval = is_fore ? XiWin->cmapping[PETSC_DRAW_WHITE] : XiWin->cmapping[PETSC_DRAW_BLACK];
379: }
380: PetscFunctionReturn(pixval);
381: }
383: /*
384: This routine takes a named color and returns a color that is either
385: lighter or darker
386: */
389: PixVal XiSimColor(PetscDraw_X *XiWin,PixVal pixel,int intensity,int is_fore)
390: {
391: XColor colordef,colorsdef;
392: char RGBcolor[20];
393: PixVal red,green,blue;
396: colordef.pixel = pixel;
397: XQueryColor(XiWin->disp,XiWin->cmap,&colordef);
398: /* Adjust the color value up or down. Get the RGB values for the color */
399: red = colordef.red;
400: green = colordef.green;
401: blue = colordef.blue;
402: #define WHITE_AMOUNT 5000
403: if (intensity > 0) {
404: /* Add white to the color */
405: red = PetscMin(65535,red + WHITE_AMOUNT);
406: green = PetscMin(65535,green + WHITE_AMOUNT);
407: blue = PetscMin(65535,blue + WHITE_AMOUNT);
408: } else {
409: /* Subtract white from the color */
410: red = (red < WHITE_AMOUNT) ? 0 : red - WHITE_AMOUNT;
411: green = (green < WHITE_AMOUNT) ? 0 : green - WHITE_AMOUNT;
412: blue = (blue < WHITE_AMOUNT) ? 0 : blue - WHITE_AMOUNT;
413: }
414: sprintf(RGBcolor,"rgb:%4.4x/%4.4x/%4.4x",(unsigned int)red,
415: (unsigned int)green,(unsigned int)blue);
416: XLookupColor(XiWin->disp,XiWin->cmap,RGBcolor,&colordef,&colorsdef);
417: PetscFunctionReturn(colorsdef.pixel);
418: }
420: /*
421: XiSetCmapLight - Create rgb values from a single color by adding white
422:
423: The initial color is (red[0],green[0],blue[0]).
424: */
427: int XiSetCmapLight(unsigned char *red,unsigned char *green,unsigned char *blue,int mapsize)
428: {
429: int i ;
432: for (i=1; i<mapsize-1; i++) {
433: blue[i] = i*(255-(int)blue[0])/(mapsize-2)+blue[0] ;
434: green[i] = i*(255-(int)green[0])/(mapsize-2)+green[0] ;
435: red[i] = i*(255-(int)red[0])/(mapsize-2)+red[0] ;
436: }
437: red[mapsize-1] = green[mapsize-1] = blue[mapsize-1] = 255;
438: return(0);
439: }