components/x11/xcolor/src/XCrHsbCmap.c

   1 /*-
   2  * XCrHsbCmap.c - X11 library routine to create an HSB ramp colormaps.
   3  *
   4  * Copyright (c) 1991, 2011, Oracle and/or its affiliates. All rights reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  *
  25  * Author: Patrick J. Naughton
  26  * naughton@sun.com
  27  */
  28
  29 #include <X11/X.h>
  30 #include <X11/Xos.h>
  31 #include <X11/Xlib.h>
  32 #include "xcolor.h"
  33
  34 Status
  35 XCreateHSBColormap(
  36     Display    *dsp,
  37     int         screen,
  38     Colormap   *cmap,           /* colormap return value */
  39     int         count,          /* number of entries to use */
  40     double      h1,             /* starting hue */
  41     double      s1,             /* starting saturation */
  42     double      b1,             /* starting brightness */
  43     double      h2,             /* ending hue */
  44     double      s2,             /* ending saturation */
  45     double      b2,             /* ending brightness */
  46     int         bw,             /* Boolean: True = save black and white */
  47     Visual    **visual)
  48 {
  49     u_char      red[256];
  50     u_char      green[256];
  51     u_char      blue[256];
  52     unsigned long pixel;
  53     Status      status;
  54     XColor      xcolors[256];
  55
  56     if (count > 256)
  57         return BadValue;
  58
  59     HSBramp(h1, s1, b1, h2, s2, b2, 0, count - 1, red, green, blue);
  60
  61     if (bw) {
  62         pixel = WhitePixel(dsp, screen);
  63         if (pixel < 256)
  64             red[pixel] = green[pixel] = blue[pixel] = 0xff;
  65
  66         pixel = BlackPixel(dsp, screen);
  67         if (pixel < 256)
  68             red[pixel] = green[pixel] = blue[pixel] = 0;
  69     }
  70     status = XCreateDynamicColormap(dsp, screen, cmap, visual, xcolors,
  71                                     count, red, green, blue);
  72
  73     return status;
  74 }