Dogcows Code - chaz/openbox/blob - render/instance.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    instance.c for the Openbox window manager
   4    Copyright (c) 2003        Ben Jansens
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    See the COPYING file for a copy of the GNU General Public License.
  17 */
  18
  19 #include "render.h"
  20 #include "instance.h"
  21
  22 static RrInstance *definst = NULL;
  23
  24 static void RrTrueColorSetup (RrInstance *inst);
  25 static void RrPseudoColorSetup (RrInstance *inst);
  26
  27 #ifdef DEBUG
  28 #include "color.h"
  29 #endif
  30 static void
  31 dest(gpointer data)
  32 {
  33 #ifdef DEBUG
  34     RrColor *c = data;
  35     if (c->refcount > 0)
  36         g_error("removing color from hash table with references");
  37 #endif
  38 }
  39
  40 RrInstance* RrInstanceNew (Display *display, gint screen)
  41 {
  42     definst = g_new (RrInstance, 1);
  43     definst->display = display;
  44     definst->screen = screen;
  45
  46     definst->depth = DefaultDepth(display, screen);
  47     definst->visual = DefaultVisual(display, screen);
  48     definst->colormap = DefaultColormap(display, screen);
  49
  50     definst->pseudo_colors = NULL;
  51
  52     definst->color_hash = g_hash_table_new_full(g_int_hash, g_int_equal,
  53                                                 NULL, dest);
  54
  55     switch (definst->visual->class) {
  56     case TrueColor:
  57         RrTrueColorSetup(definst);
  58         break;
  59     case PseudoColor:
  60     case StaticColor:
  61     case GrayScale:
  62     case StaticGray:
  63         RrPseudoColorSetup(definst);
  64         break;
  65     default:
  66         g_critical("Unsupported visual class");
  67         g_free (definst);
  68         return definst = NULL;
  69     }
  70     return definst;
  71 }
  72
  73 void RrTrueColorSetup (RrInstance *inst)
  74 {
  75   unsigned long red_mask, green_mask, blue_mask;
  76   XImage *timage = NULL;
  77
  78   timage = XCreateImage(inst->display, inst->visual, inst->depth,
  79                         ZPixmap, 0, NULL, 1, 1, 32, 0);
  80   g_assert(timage != NULL);
  81   /* find the offsets for each color in the visual's masks */
  82   inst->red_mask = red_mask = timage->red_mask;
  83   inst->green_mask = green_mask = timage->green_mask;
  84   inst->blue_mask = blue_mask = timage->blue_mask;
  85
  86   inst->red_offset = 0;
  87   inst->green_offset = 0;
  88   inst->blue_offset = 0;
  89
  90   while (! (red_mask & 1))   { inst->red_offset++;   red_mask   >>= 1; }
  91   while (! (green_mask & 1)) { inst->green_offset++; green_mask >>= 1; }
  92   while (! (blue_mask & 1))  { inst->blue_offset++;  blue_mask  >>= 1; }
  93
  94   inst->red_shift = inst->green_shift = inst->blue_shift = 8;
  95   while (red_mask)   { red_mask   >>= 1; inst->red_shift--;   }
  96   while (green_mask) { green_mask >>= 1; inst->green_shift--; }
  97   while (blue_mask)  { blue_mask  >>= 1; inst->blue_shift--;  }
  98   XFree(timage);
  99 }
 100
 101 #define RrPseudoNcolors(isnt) (1 << (inst->pseudo_bpc * 3))
 102
 103 void RrPseudoColorSetup (RrInstance *inst)
 104 {
 105     XColor icolors[256];
 106     int tr, tg, tb, n, r, g, b, i, incolors, ii;
 107     unsigned long dev;
 108     int cpc, _ncolors;
 109
 110     /* determine the number of colors and the bits-per-color */
 111     inst->pseudo_bpc = 2; /* XXX THIS SHOULD BE A USER OPTION */
 112     g_assert(inst->pseudo_bpc >= 1);
 113     _ncolors = RrPseudoNcolors(inst);
 114
 115     if (_ncolors > 1 << inst->depth) {
 116         g_warning("PseudoRenderControl: Invalid colormap size. Resizing.\n");
 117         inst->pseudo_bpc = 1 << (inst->depth/3) >> 3;
 118         _ncolors = 1 << (inst->pseudo_bpc * 3);
 119     }
 120
 121     /* build a color cube */
 122     inst->pseudo_colors = g_new(XColor, _ncolors);
 123     cpc = 1 << inst->pseudo_bpc; /* colors per channel */
 124
 125     for (n = 0, r = 0; r < cpc; r++)
 126         for (g = 0; g < cpc; g++)
 127             for (b = 0; b < cpc; b++, n++) {
 128                 tr = (int)(((float)(r)/(float)(cpc-1)) * 0xFF);
 129                 tg = (int)(((float)(g)/(float)(cpc-1)) * 0xFF);
 130                 tb = (int)(((float)(b)/(float)(cpc-1)) * 0xFF);
 131                 inst->pseudo_colors[n].red = tr | tr << 8;
 132                 inst->pseudo_colors[n].green = tg | tg << 8;
 133                 inst->pseudo_colors[n].blue = tb | tb << 8;
 134                 /* used to track allocation */
 135                 inst->pseudo_colors[n].flags = DoRed|DoGreen|DoBlue;
 136             }
 137
 138     /* allocate the colors */
 139     for (i = 0; i < _ncolors; i++)
 140         if (!XAllocColor(inst->display, inst->colormap,
 141                          &inst->pseudo_colors[i]))
 142             inst->pseudo_colors[i].flags = 0; /* mark it as unallocated */
 143
 144     /* try allocate any colors that failed allocation above */
 145
 146     /* get the allocated values from the X server
 147        (only the first 256 XXX why!?)
 148      */
 149     incolors = (((1 << inst->depth) > 256) ? 256 : (1 << inst->depth));
 150     for (i = 0; i < incolors; i++)
 151         icolors[i].pixel = i;
 152     XQueryColors(inst->display, inst->colormap, icolors, incolors);
 153
 154     /* try match unallocated ones */
 155     for (i = 0; i < _ncolors; i++) {
 156         if (!inst->pseudo_colors[i].flags) { /* if it wasn't allocated... */
 157             unsigned long closest = 0xffffffff, close = 0;
 158             for (ii = 0; ii < incolors; ii++) {
 159                 /* find deviations */
 160                 r = (inst->pseudo_colors[i].red - icolors[ii].red) & 0xff;
 161                 g = (inst->pseudo_colors[i].green - icolors[ii].green) & 0xff;
 162                 b = (inst->pseudo_colors[i].blue - icolors[ii].blue) & 0xff;
 163                 /* find a weighted absolute deviation */
 164                 dev = (r * r) + (g * g) + (b * b);
 165
 166                 if (dev < closest) {
 167                     closest = dev;
 168                     close = ii;
 169                 }
 170             }
 171
 172             inst->pseudo_colors[i].red = icolors[close].red;
 173             inst->pseudo_colors[i].green = icolors[close].green;
 174             inst->pseudo_colors[i].blue = icolors[close].blue;
 175             inst->pseudo_colors[i].pixel = icolors[close].pixel;
 176
 177             /* try alloc this closest color, it had better succeed! */
 178             if (XAllocColor(inst->display, inst->colormap,
 179                             &inst->pseudo_colors[i]))
 180                 /* mark as alloced */
 181                 inst->pseudo_colors[i].flags = DoRed|DoGreen|DoBlue;
 182             else
 183                 /* wtf has gone wrong, its already alloced for chissake! */
 184                 g_assert_not_reached();
 185         }
 186     }
 187 }
 188
 189 void RrInstanceFree (RrInstance *inst)
 190 {
 191     if (inst) {
 192         if (inst == definst) definst = NULL;
 193         g_free(inst->pseudo_colors);
 194         g_hash_table_destroy(inst->color_hash);
 195     }
 196 }
 197
 198 Display* RrDisplay (const RrInstance *inst)
 199 {
 200     return (inst ? inst : definst)->display;
 201 }
 202
 203 gint RrScreen (const RrInstance *inst)
 204 {
 205     return (inst ? inst : definst)->screen;
 206 }
 207
 208 Window RrRootWindow (const RrInstance *inst)
 209 {
 210     return RootWindow (RrDisplay (inst), RrScreen (inst));
 211 }
 212
 213 Visual *RrVisual (const RrInstance *inst)
 214 {
 215     return (inst ? inst : definst)->visual;
 216 }
 217
 218 gint RrDepth (const RrInstance *inst)
 219 {
 220     return (inst ? inst : definst)->depth;
 221 }
 222
 223 Colormap RrColormap (const RrInstance *inst)
 224 {
 225     return (inst ? inst : definst)->colormap;
 226 }
 227
 228 gint RrRedOffset (const RrInstance *inst)
 229 {
 230     return (inst ? inst : definst)->red_offset;
 231 }
 232
 233 gint RrGreenOffset (const RrInstance *inst)
 234 {
 235     return (inst ? inst : definst)->green_offset;
 236 }
 237
 238 gint RrBlueOffset (const RrInstance *inst)
 239 {
 240     return (inst ? inst : definst)->blue_offset;
 241 }
 242
 243 gint RrRedShift (const RrInstance *inst)
 244 {
 245     return (inst ? inst : definst)->red_shift;
 246 }
 247
 248 gint RrGreenShift (const RrInstance *inst)
 249 {
 250     return (inst ? inst : definst)->green_shift;
 251 }
 252
 253 gint RrBlueShift (const RrInstance *inst)
 254 {
 255     return (inst ? inst : definst)->blue_shift;
 256 }
 257
 258 gint RrRedMask (const RrInstance *inst)
 259 {
 260     return (inst ? inst : definst)->red_mask;
 261 }
 262
 263 gint RrGreenMask (const RrInstance *inst)
 264 {
 265     return (inst ? inst : definst)->green_mask;
 266 }
 267
 268 gint RrBlueMask (const RrInstance *inst)
 269 {
 270     return (inst ? inst : definst)->blue_mask;
 271 }
 272
 273 guint RrPseudoBPC (const RrInstance *inst)
 274 {
 275     return (inst ? inst : definst)->pseudo_bpc;
 276 }
 277
 278 XColor *RrPseudoColors (const RrInstance *inst)
 279 {
 280     return (inst ? inst : definst)->pseudo_colors;
 281 }
 282
 283 GHashTable* RrColorHash (const RrInstance *inst)
 284 {
 285     return (inst ? inst : definst)->color_hash;
 286 }