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 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;
73: int PetscDrawSetUpColormap_Shared(Display *display,int screen,Visual *visual,Colormap colormap)
74: {
75: XColor colordef,ecolordef;
76: unsigned char *red,*green,*blue;
77: int i,ierr,ncolors;
78: PetscTruth fast;
81: if (colormap) {
82: gColormap = colormap;
83: } else {
84: gColormap = DefaultColormap(display,screen);
85: }
87: /* set the basic colors into the color map */
88: for (i=0; i<PETSC_DRAW_BASIC_COLORS; i++) {
89: XAllocNamedColor(display,gColormap,colornames[i],&colordef,&ecolordef);
90: gCmapping[i] = colordef.pixel;
91: }
93: /* set the uniform hue colors into the color map */
94: ncolors = 256-PETSC_DRAW_BASIC_COLORS;
95: ierr = PetscMalloc(3*ncolors*sizeof(unsigned char),&red);
96: green = red + ncolors;
97: blue = green + ncolors;
98: ierr = PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
99: ierr = PetscOptionsHasName(PETSC_NULL,"-draw_fast",&fast);
100: if (!fast) {
101: for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
102: colordef.red = ((int)red[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
103: colordef.green = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
104: colordef.blue = ((int)blue[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
105: colordef.flags = DoRed | DoGreen | DoBlue;
106: XAllocColor(display,gColormap,&colordef);
107: gCmapping[i] = colordef.pixel;
108: }
109: }
110: PetscFree(red);
111: PetscLogInfo(0,"PetscDrawSetUpColormap_Shared:Successfully allocated colorsn");
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;
124: int PetscDrawSetUpColormap_Private(Display *display,int screen,Visual *visual,Colormap colormap)
125: {
126: Colormap defaultmap = DefaultColormap(display,screen);
127: int ierr,found,i,ncolors;
128: XColor colordef;
129: unsigned char *red,*green,*blue;
130: PetscTruth fast;
134: if (colormap) {
135: gColormap = colormap;
136: } else {
137: gColormap = XCreateColormap(display,RootWindow(display,screen),visual,AllocAll);
138: }
140: cmap_base = 0;
141: PetscMemzero(cmap_pixvalues_used,256*sizeof(PetscTruth));
143: /* set the basic colors into the color map */
144: for (i=0; i<PETSC_DRAW_BASIC_COLORS; i++) {
145: XParseColor(display,gColormap,colornames[i],&colordef);
146: /* try to allocate the color in the default-map */
147: found = XAllocColor(display,defaultmap,&colordef);
148: /* use it, if it it exists and is not already used in the new colormap */
149: if (found && colordef.pixel < 256 && !cmap_pixvalues_used[colordef.pixel]) {
150: cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
151: /* otherwise search for the next available slot */
152: } else {
153: while (cmap_pixvalues_used[cmap_base]) cmap_base++;
154: colordef.pixel = cmap_base;
155: cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
156: }
157: XStoreColor(display,gColormap,&colordef);
158: gCmapping[i] = colordef.pixel;
159: }
161: /* set the uniform hue colors into the color map */
162: ncolors = 256-PETSC_DRAW_BASIC_COLORS;
163: ierr = PetscMalloc(3*ncolors*sizeof(unsigned char),&red);
164: green = red + ncolors;
165: blue = green + ncolors;
166: ierr = PetscDrawUtilitySetCmapHue(red,green,blue,ncolors);
167: ierr = PetscOptionsHasName(PETSC_NULL,"-draw_fast",&fast);
168: if (!fast) {
169: for (i=PETSC_DRAW_BASIC_COLORS; i<ncolors+PETSC_DRAW_BASIC_COLORS; i++) {
170: colordef.red = ((int)red[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
171: colordef.green = ((int)green[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
172: colordef.blue = ((int)blue[i-PETSC_DRAW_BASIC_COLORS] * 65535) / 255;
173: colordef.flags = DoRed | DoGreen | DoBlue;
174: /* try to allocate the color in the default-map */
175: found = XAllocColor(display,defaultmap,&colordef);
176: /* use it, if it it exists and is not already used in the new colormap */
177: if (found && colordef.pixel < 256 && !cmap_pixvalues_used[colordef.pixel]) {
178: cmap_pixvalues_used[colordef.pixel] = PETSC_TRUE;
179: /* otherwise search for the next available slot */
180: } else {
181: while (cmap_pixvalues_used[cmap_base]) cmap_base++;
182: colordef.pixel = cmap_base;
183: cmap_pixvalues_used[cmap_base++] = PETSC_TRUE;
184: }
185: XStoreColor(display,gColormap,&colordef);
186: gCmapping[i] = colordef.pixel;
187: }
188: }
189: PetscFree(red);
190: PetscLogInfo(0,"PetscDrawSetUpColormap_Private:Successfully allocated colorsn");
191: return(0);
192: }
194: int PetscDrawSetUpColormap_X(Display *display,int screen,Visual *visual,Colormap colormap)
195: {
196: int ierr;
197: PetscTruth sharedcolormap;
198: XVisualInfo vinfo;
202: /*
203: This is wrong; it needs to take the value from the visual
204: */
205: gNumcolors = 1 << DefaultDepth(display,screen);
207: PetscOptionsHasName(PETSC_NULL,"-draw_x_shared_colormap",&sharedcolormap);
208: /*
209: Need to determine if window supports allocating a private colormap,
210: if not, set flag to 1
211: */
212: if (XMatchVisualInfo(display,screen,24,StaticColor,&vinfo) ||
213: XMatchVisualInfo(display,screen,24,TrueColor,&vinfo) ||
214: XMatchVisualInfo(display,screen,16,StaticColor,&vinfo) ||
215: XMatchVisualInfo(display,screen,16,TrueColor,&vinfo)) {
216: sharedcolormap = PETSC_TRUE;
217: }
219: /* generate the X color map object */
220: if (sharedcolormap) {
221: PetscDrawSetUpColormap_Shared(display,screen,visual,colormap);
222: } else {
223: PetscDrawSetUpColormap_Private(display,screen,visual,colormap);
224: }
225:
226: return(0);
227: }
229: int PetscDrawSetColormap_X(PetscDraw_X* XiWin,char *host,Colormap colormap)
230: {
234: if (XiWin->depth < 8) {
235: SETERRQ(1,"PETSc Graphics require monitors with at least 8 bit color (256 colors)");
236: }
237: if (!gColormap){
238: Display *display; /* Private display will exist forever contains colormap shared by all windows */
239: int screen;
240: Visual* vis;
242: display = XOpenDisplay(host);
243: screen = DefaultScreen(display);
244: vis = DefaultVisual(display,screen);
246: PetscDrawSetUpColormap_X(display,screen,vis,colormap);
247: }
248: XiWin->cmap = gColormap;
249: PetscMemcpy(XiWin->cmapping,gCmapping,256*sizeof(PixVal));
250: XiWin->background = XiWin->cmapping[PETSC_DRAW_WHITE];
251: XiWin->foreground = XiWin->cmapping[PETSC_DRAW_BLACK];
252: return(0);
253: }
255: /*
256: Color in X is many-layered. The first layer is the "visual",a
257: immutable attribute of a window set when the window is
258: created.
260: The next layer is the colormap. The installation of colormaps is
261: the buisness of the window manager (in some distant later release).
262: */
264: /*
265: This routine gets the visual class (PseudoColor, etc) and returns
266: it. It finds the default visual. Possible returns are
267: PseudoColor
268: StaticColor
269: DirectColor
270: TrueColor
271: GrayScale
272: StaticGray
273: */
274: int XiSetVisualClass(PetscDraw_X* XiWin)
275: {
276: XVisualInfo vinfo;
279: if (XMatchVisualInfo(XiWin->disp,XiWin->screen,24,DirectColor,&vinfo)) {
280: XiWin->vis = vinfo.visual;
281: return(0);
282: }
283: if (XMatchVisualInfo(XiWin->disp,XiWin->screen,8,PseudoColor,&vinfo)) {
284: XiWin->vis = vinfo.visual;
285: return(0);
286: }
287: if (XMatchVisualInfo(XiWin->disp,XiWin->screen,
288: DefaultDepth(XiWin->disp,XiWin->screen),PseudoColor,&vinfo)) {
289: XiWin->vis = vinfo.visual;
290: return(0);
291: }
292: XiWin->vis = DefaultVisual(XiWin->disp,XiWin->screen);
293: return(0);
294: }
296: int XiGetVisualClass(PetscDraw_X* XiWin)
297: {
299: #if defined(__cplusplus)
300: PetscFunctionReturn(XiWin->vis->c_class);
301: #else
302: PetscFunctionReturn(XiWin->vis->class);
303: #endif
304: }
307: int XiSetColormap(PetscDraw_X* XiWin)
308: {
310: XSetWindowColormap(XiWin->disp,XiWin->win,XiWin->cmap);
311: return(0);
312: }
314: int XiGetBaseColor(PetscDraw_X* XiWin,PixVal* white_pix,PixVal* black_pix)
315: {
317: *white_pix = XiWin->cmapping[PETSC_DRAW_WHITE];
318: *black_pix = XiWin->cmapping[PETSC_DRAW_BLACK];
319: return(0);
320: }
324: /*
325: This routine returns the pixel value for the specified color
326: Returns 0 on failure,<>0 otherwise.
327: */
328: int XiFindColor(PetscDraw_X *XiWin,char *name,PixVal *pixval)
329: {
330: XColor colordef;
331: int st;
334: st = XParseColor(XiWin->disp,XiWin->cmap,name,&colordef);
335: if (st) {
336: st = XAllocColor(XiWin->disp,XiWin->cmap,&colordef);
337: if (st) *pixval = colordef.pixel;
338: }
339: PetscFunctionReturn(st);
340: }
342: /*
343: Another real need is to assign "colors" that make sense for
344: a monochrome display,without unduely penalizing color displays.
345: This routine takes a color name,a window, and a flag that
346: indicates whether this is "background" or "foreground".
347: In the monchrome case (or if the color is otherwise unavailable),
348: the "background" or "foreground" colors will be chosen
349: */
350: PixVal XiGetColor(PetscDraw_X* XiWin,char *name,int is_fore)
351: {
352: PixVal pixval;
355: if (XiWin->numcolors == 2 || !XiFindColor(XiWin,name,&pixval)) {
356: pixval = is_fore ? XiWin->cmapping[PETSC_DRAW_WHITE] : XiWin->cmapping[PETSC_DRAW_BLACK];
357: }
358: PetscFunctionReturn(pixval);
359: }
361: /*
362: This routine takes a named color and returns a color that is either
363: lighter or darker
364: */
365: PixVal XiSimColor(PetscDraw_X *XiWin,PixVal pixel,int intensity,int is_fore)
366: {
367: XColor colordef,colorsdef;
368: char RGBcolor[20];
369: PixVal red,green,blue;
372: colordef.pixel = pixel;
373: XQueryColor(XiWin->disp,XiWin->cmap,&colordef);
374: /* Adjust the color value up or down. Get the RGB values for the color */
375: red = colordef.red;
376: green = colordef.green;
377: blue = colordef.blue;
378: #define WHITE_AMOUNT 5000
379: if (intensity > 0) {
380: /* Add white to the color */
381: red = PetscMin(65535,red + WHITE_AMOUNT);
382: green = PetscMin(65535,green + WHITE_AMOUNT);
383: blue = PetscMin(65535,blue + WHITE_AMOUNT);
384: } else {
385: /* Subtract white from the color */
386: red = (red < WHITE_AMOUNT) ? 0 : red - WHITE_AMOUNT;
387: green = (green < WHITE_AMOUNT) ? 0 : green - WHITE_AMOUNT;
388: blue = (blue < WHITE_AMOUNT) ? 0 : blue - WHITE_AMOUNT;
389: }
390: sprintf(RGBcolor,"rgb:%4.4x/%4.4x/%4.4x",(unsigned int)red,
391: (unsigned int)green,(unsigned int)blue);
392: XLookupColor(XiWin->disp,XiWin->cmap,RGBcolor,&colordef,&colorsdef);
393: PetscFunctionReturn(colorsdef.pixel);
394: }
396: /*
397: XiSetCmapLight - Create rgb values from a single color by adding white
398:
399: The initial color is (red[0],green[0],blue[0]).
400: */
401: int XiSetCmapLight(unsigned char *red,unsigned char *green,unsigned char *blue,int mapsize)
402: {
403: int i ;
406: for (i=1; i<mapsize-1; i++) {
407: blue[i] = i*(255-(int)blue[0])/(mapsize-2)+blue[0] ;
408: green[i] = i*(255-(int)green[0])/(mapsize-2)+green[0] ;
409: red[i] = i*(255-(int)red[0])/(mapsize-2)+red[0] ;
410: }
411: red[mapsize-1] = green[mapsize-1] = blue[mapsize-1] = 255;
412: return(0);
413: }