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) 2006        Mikael Magnusson
   5    Copyright (c) 2003-2007   Dana Jansens
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "render.h"
  21 #include "instance.h"
  22
  23 static RrInstance *definst = NULL;
  24
  25 static void RrTrueColorSetup (RrInstance *inst);
  26 static void RrPseudoColorSetup (RrInstance *inst);
  27
  28 #ifdef DEBUG
  29 #include "color.h"
  30 #endif
  31 static void
  32 dest(gpointer data)
  33 {
  34 #ifdef DEBUG
  35     RrColor *c = data;
  36     if (c->refcount > 0)
  37         g_error("color %d (%d,%d,%d) in hash table with %d "
  38                 "leftover references",
  39                 c->id, RrColorRed(c), RrColorGreen(c), RrColorBlue(c),
  40                 c->refcount);
  41 #endif
  42 }
  43
  44 #if 0
  45 static void f(gpointer key, gpointer value, gpointer n)
  46 {
  47     RrColor *c = value;
  48     if (c->id == *(gint*)n)
  49         g_message("color %d has %d references", c->id, c->refcount);
  50 }
  51
  52 void print_refs(gint id)
  53 {
  54     g_hash_table_foreach(RrColorHash(definst), f, &id);
  55 }
  56 #endif
  57
  58 RrInstance* RrInstanceNew (Display *display, gint screen)
  59 {
  60     g_type_init(); /* supposedly needed for pango but seems to work without */
  61
  62     definst = g_new (RrInstance, 1);
  63     definst->display = display;
  64     definst->screen = screen;
  65
  66     definst->depth = DefaultDepth(display, screen);
  67     definst->visual = DefaultVisual(display, screen);
  68     definst->colormap = DefaultColormap(display, screen);
  69     definst->pango = pango_xft_get_context(display, screen);
  70
  71     definst->pseudo_colors = NULL;
  72
  73     definst->color_hash = g_hash_table_new_full(g_int_hash, g_int_equal,
  74                                                 NULL, dest);
  75
  76     switch (definst->visual->class) {
  77     case TrueColor:
  78         RrTrueColorSetup(definst);
  79         break;
  80     case PseudoColor:
  81     case StaticColor:
  82     case GrayScale:
  83     case StaticGray:
  84         RrPseudoColorSetup(definst);
  85         break;
  86     default:
  87         g_critical("Unsupported visual class");
  88         g_free (definst);
  89         return definst = NULL;
  90     }
  91     return definst;
  92 }
  93
  94 static void RrTrueColorSetup (RrInstance *inst)
  95 {
  96   gulong red_mask, green_mask, blue_mask;
  97   XImage *timage = NULL;
  98
  99   timage = XCreateImage(inst->display, inst->visual, inst->depth,
 100                         ZPixmap, 0, NULL, 1, 1, 32, 0);
 101   g_assert(timage != NULL);
 102   /* find the offsets for each color in the visual's masks */
 103   inst->red_mask = red_mask = timage->red_mask;
 104   inst->green_mask = green_mask = timage->green_mask;
 105   inst->blue_mask = blue_mask = timage->blue_mask;
 106
 107   inst->red_offset = 0;
 108   inst->green_offset = 0;
 109   inst->blue_offset = 0;
 110
 111   while (! (red_mask & 1))   { inst->red_offset++;   red_mask   >>= 1; }
 112   while (! (green_mask & 1)) { inst->green_offset++; green_mask >>= 1; }
 113   while (! (blue_mask & 1))  { inst->blue_offset++;  blue_mask  >>= 1; }
 114
 115   inst->red_shift = inst->green_shift = inst->blue_shift = 8;
 116   while (red_mask)   { red_mask   >>= 1; inst->red_shift--;   }
 117   while (green_mask) { green_mask >>= 1; inst->green_shift--; }
 118   while (blue_mask)  { blue_mask  >>= 1; inst->blue_shift--;  }
 119   XFree(timage);
 120 }
 121
 122 #define RrPseudoNcolors(inst) (1 << (inst->pseudo_bpc * 3))
 123
 124 static void RrPseudoColorSetup (RrInstance *inst)
 125 {
 126     XColor icolors[256];
 127     gint tr, tg, tb, n, r, g, b, i, incolors, ii;
 128     gulong dev;
 129     gint cpc, _ncolors;
 130
 131     /* determine the number of colors and the bits-per-color */
 132     inst->pseudo_bpc = 2; /* XXX THIS SHOULD BE A USER OPTION */
 133     g_assert(inst->pseudo_bpc >= 1);
 134     _ncolors = RrPseudoNcolors(inst);
 135
 136     if (_ncolors > 1 << inst->depth) {
 137         g_message("Invalid colormap size. Resizing.");
 138         inst->pseudo_bpc = 1 << (inst->depth/3) >> 3;
 139         _ncolors = 1 << (inst->pseudo_bpc * 3);
 140     }
 141
 142     /* build a color cube */
 143     inst->pseudo_colors = g_new(XColor, _ncolors);
 144     cpc = 1 << inst->pseudo_bpc; /* colors per channel */
 145
 146     for (n = 0, r = 0; r < cpc; r++)
 147         for (g = 0; g < cpc; g++)
 148             for (b = 0; b < cpc; b++, n++) {
 149                 tr = (gint)(((gfloat)(r)/(gfloat)(cpc-1)) * 0xFF);
 150                 tg = (gint)(((gfloat)(g)/(gfloat)(cpc-1)) * 0xFF);
 151                 tb = (gint)(((gfloat)(b)/(gfloat)(cpc-1)) * 0xFF);
 152                 inst->pseudo_colors[n].red = tr | tr << 8;
 153                 inst->pseudo_colors[n].green = tg | tg << 8;
 154                 inst->pseudo_colors[n].blue = tb | tb << 8;
 155                 /* used to track allocation */
 156                 inst->pseudo_colors[n].flags = DoRed|DoGreen|DoBlue;
 157             }
 158
 159     /* allocate the colors */
 160     for (i = 0; i < _ncolors; i++)
 161         if (!XAllocColor(inst->display, inst->colormap,
 162                          &inst->pseudo_colors[i]))
 163             inst->pseudo_colors[i].flags = 0; /* mark it as unallocated */
 164
 165     /* try allocate any colors that failed allocation above */
 166
 167     /* get the allocated values from the X server
 168        (only the first 256 XXX why!?)
 169      */
 170     incolors = (((1 << inst->depth) > 256) ? 256 : (1 << inst->depth));
 171     for (i = 0; i < incolors; i++)
 172         icolors[i].pixel = i;
 173     XQueryColors(inst->display, inst->colormap, icolors, incolors);
 174
 175     /* try match unallocated ones */
 176     for (i = 0; i < _ncolors; i++) {
 177         if (!inst->pseudo_colors[i].flags) { /* if it wasn't allocated... */
 178             gulong closest = 0xffffffff, close = 0;
 179             for (ii = 0; ii < incolors; ii++) {
 180                 /* find deviations */
 181                 r = (inst->pseudo_colors[i].red - icolors[ii].red) & 0xff;
 182                 g = (inst->pseudo_colors[i].green - icolors[ii].green) & 0xff;
 183                 b = (inst->pseudo_colors[i].blue - icolors[ii].blue) & 0xff;
 184                 /* find a weighted absolute deviation */
 185                 dev = (r * r) + (g * g) + (b * b);
 186
 187                 if (dev < closest) {
 188                     closest = dev;
 189                     close = ii;
 190                 }
 191             }
 192
 193             inst->pseudo_colors[i].red = icolors[close].red;
 194             inst->pseudo_colors[i].green = icolors[close].green;
 195             inst->pseudo_colors[i].blue = icolors[close].blue;
 196             inst->pseudo_colors[i].pixel = icolors[close].pixel;
 197
 198             /* try alloc this closest color, it had better succeed! */
 199             if (XAllocColor(inst->display, inst->colormap,
 200                             &inst->pseudo_colors[i]))
 201                 /* mark as alloced */
 202                 inst->pseudo_colors[i].flags = DoRed|DoGreen|DoBlue;
 203             else
 204                 /* wtf has gone wrong, its already alloced for chissake! */
 205                 g_assert_not_reached();
 206         }
 207     }
 208 }
 209
 210 void RrInstanceFree (RrInstance *inst)
 211 {
 212     if (inst) {
 213         if (inst == definst) definst = NULL;
 214         g_free(inst->pseudo_colors);
 215         g_hash_table_destroy(inst->color_hash);
 216         g_object_unref(inst->pango);
 217         g_free(inst);
 218     }
 219 }
 220
 221 Display* RrDisplay (const RrInstance *inst)
 222 {
 223     return (inst ? inst : definst)->display;
 224 }
 225
 226 gint RrScreen (const RrInstance *inst)
 227 {
 228     return (inst ? inst : definst)->screen;
 229 }
 230
 231 Window RrRootWindow (const RrInstance *inst)
 232 {
 233     return RootWindow (RrDisplay (inst), RrScreen (inst));
 234 }
 235
 236 Visual *RrVisual (const RrInstance *inst)
 237 {
 238     return (inst ? inst : definst)->visual;
 239 }
 240
 241 gint RrDepth (const RrInstance *inst)
 242 {
 243     return (inst ? inst : definst)->depth;
 244 }
 245
 246 Colormap RrColormap (const RrInstance *inst)
 247 {
 248     return (inst ? inst : definst)->colormap;
 249 }
 250
 251 gint RrRedOffset (const RrInstance *inst)
 252 {
 253     return (inst ? inst : definst)->red_offset;
 254 }
 255
 256 gint RrGreenOffset (const RrInstance *inst)
 257 {
 258     return (inst ? inst : definst)->green_offset;
 259 }
 260
 261 gint RrBlueOffset (const RrInstance *inst)
 262 {
 263     return (inst ? inst : definst)->blue_offset;
 264 }
 265
 266 gint RrRedShift (const RrInstance *inst)
 267 {
 268     return (inst ? inst : definst)->red_shift;
 269 }
 270
 271 gint RrGreenShift (const RrInstance *inst)
 272 {
 273     return (inst ? inst : definst)->green_shift;
 274 }
 275
 276 gint RrBlueShift (const RrInstance *inst)
 277 {
 278     return (inst ? inst : definst)->blue_shift;
 279 }
 280
 281 gint RrRedMask (const RrInstance *inst)
 282 {
 283     return (inst ? inst : definst)->red_mask;
 284 }
 285
 286 gint RrGreenMask (const RrInstance *inst)
 287 {
 288     return (inst ? inst : definst)->green_mask;
 289 }
 290
 291 gint RrBlueMask (const RrInstance *inst)
 292 {
 293     return (inst ? inst : definst)->blue_mask;
 294 }
 295
 296 guint RrPseudoBPC (const RrInstance *inst)
 297 {
 298     return (inst ? inst : definst)->pseudo_bpc;
 299 }
 300
 301 XColor *RrPseudoColors (const RrInstance *inst)
 302 {
 303     return (inst ? inst : definst)->pseudo_colors;
 304 }
 305
 306 GHashTable* RrColorHash (const RrInstance *inst)
 307 {
 308     return (inst ? inst : definst)->color_hash;
 309 }