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: }