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

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    color.c for the Openbox window manager
   4    Copyright (c) 2003        Ben Jansens
   5    Copyright (c) 2003        Derek Foreman
   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 "color.h"
  22 #include "instance.h"
  23
  24 #include <X11/Xlib.h>
  25 #include <X11/Xutil.h>
  26 #include <string.h>
  27
  28 void RrColorAllocateGC(RrColor *in)
  29 {
  30     XGCValues gcv;
  31
  32     gcv.foreground = in->pixel;
  33     gcv.cap_style = CapProjecting;
  34     in->gc = XCreateGC(RrDisplay(in->inst),
  35                        RrRootWindow(in->inst),
  36                        GCForeground | GCCapStyle, &gcv);
  37 }
  38
  39 RrColor *RrColorParse(const RrInstance *inst, gchar *colorname)
  40 {
  41     XColor xcol;
  42
  43     g_assert(colorname != NULL);
  44     /* get rgb values from colorname */
  45
  46     xcol.red = 0;
  47     xcol.green = 0;
  48     xcol.blue = 0;
  49     xcol.pixel = 0;
  50     if (!XParseColor(RrDisplay(inst), RrColormap(inst), colorname, &xcol)) {
  51         g_warning("unable to parse color '%s'", colorname);
  52         return NULL;
  53     }
  54     return RrColorNew(inst, xcol.red >> 8, xcol.green >> 8, xcol.blue >> 8);
  55 }
  56
  57 /*#define NO_COLOR_CACHE*/
  58 #ifdef DEBUG
  59 gint id;
  60 #endif
  61
  62 RrColor *RrColorNew(const RrInstance *inst, gint r, gint g, gint b)
  63 {
  64     /* this should be replaced with something far cooler */
  65     RrColor *out = NULL;
  66     XColor xcol;
  67     gint key;
  68
  69     key = (r << 24) + (g << 16) + (b << 8);
  70 #ifndef NO_COLOR_CACHE
  71     if ((out = g_hash_table_lookup(RrColorHash(inst), &key))) {
  72         out->refcount++;
  73     } else {
  74 #endif
  75         xcol.red = (r << 8) | r;
  76         xcol.green = (g << 8) | g;
  77         xcol.blue = (b << 8) | b;
  78         if (XAllocColor(RrDisplay(inst), RrColormap(inst), &xcol)) {
  79             out = g_new(RrColor, 1);
  80             out->inst = inst;
  81             out->r = xcol.red >> 8;
  82             out->g = xcol.green >> 8;
  83             out->b = xcol.blue >> 8;
  84             out->gc = None;
  85             out->pixel = xcol.pixel;
  86             out->key = key;
  87             out->refcount = 1;
  88 #ifdef DEBUG
  89             out->id = id++;
  90 #endif
  91 #ifndef NO_COLOR_CACHE
  92             g_hash_table_insert(RrColorHash(inst), &out->key, out);
  93         }
  94 #endif
  95     }
  96     return out;
  97 }
  98
  99 void RrColorFree(RrColor *c)
 100 {
 101     if (c) {
 102         if (--c->refcount < 1) {
 103 #ifndef NO_COLOR_CACHE
 104             g_assert(g_hash_table_lookup(RrColorHash(c->inst), &c->key));
 105             g_hash_table_remove(RrColorHash(c->inst), &c->key);
 106 #endif
 107             if (c->pixel) XFreeColors(RrDisplay(c->inst), RrColormap(c->inst),
 108                                       &c->pixel, 1, 0);
 109             if (c->gc) XFreeGC(RrDisplay(c->inst), c->gc);
 110             g_free(c);
 111         }
 112     }
 113 }
 114
 115 void RrReduceDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 116 {
 117     gint r, g, b;
 118     gint x,y;
 119     RrPixel32 *p32 = (RrPixel32 *) im->data;
 120     RrPixel16 *p16 = (RrPixel16 *) im->data;
 121     guchar *p8 = (guchar *)im->data;
 122     switch (im->bits_per_pixel) {
 123     case 32:
 124         if ((RrRedOffset(inst) != RrDefaultRedOffset) ||
 125             (RrBlueOffset(inst) != RrDefaultBlueOffset) ||
 126             (RrGreenOffset(inst) != RrDefaultGreenOffset)) {
 127             for (y = 0; y < im->height; y++) {
 128                 for (x = 0; x < im->width; x++) {
 129                     r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 130                     g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 131                     b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 132                     p32[x] = (r << RrRedOffset(inst))
 133                            + (g << RrGreenOffset(inst))
 134                            + (b << RrBlueOffset(inst));
 135                 }
 136                 data += im->width;
 137                 p32 += im->width;
 138             }
 139         } else im->data = (gchar*) data;
 140         break;
 141     case 16:
 142         for (y = 0; y < im->height; y++) {
 143             for (x = 0; x < im->width; x++) {
 144                 r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 145                 r = r >> RrRedShift(inst);
 146                 g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 147                 g = g >> RrGreenShift(inst);
 148                 b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 149                 b = b >> RrBlueShift(inst);
 150                 p16[x] = (r << RrRedOffset(inst))
 151                        + (g << RrGreenOffset(inst))
 152                        + (b << RrBlueOffset(inst));
 153             }
 154             data += im->width;
 155             p16 += im->bytes_per_line/2;
 156         }
 157     break;
 158     case 8:
 159         g_assert(RrVisual(inst)->class != TrueColor);
 160         for (y = 0; y < im->height; y++) {
 161             for (x = 0; x < im->width; x++) {
 162                 p8[x] = RrPickColor(inst,
 163                                     data[x] >> RrDefaultRedOffset,
 164                                     data[x] >> RrDefaultGreenOffset,
 165                                     data[x] >> RrDefaultBlueOffset)->pixel;
 166         }
 167         data += im->width;
 168         p8 += im->bytes_per_line;
 169   }
 170
 171     break;
 172     default:
 173         g_warning("your bit depth is currently unhandled\n");
 174     }
 175 }
 176
 177 XColor *RrPickColor(const RrInstance *inst, gint r, gint g, gint b)
 178 {
 179   r = (r & 0xff) >> (8-RrPseudoBPC(inst));
 180   g = (g & 0xff) >> (8-RrPseudoBPC(inst));
 181   b = (b & 0xff) >> (8-RrPseudoBPC(inst));
 182   return &RrPseudoColors(inst)[(r << (2*RrPseudoBPC(inst))) +
 183                                (g << (1*RrPseudoBPC(inst))) +
 184                                b];
 185 }
 186
 187 static void swap_byte_order(XImage *im)
 188 {
 189     gint x, y, di;
 190
 191     di = 0;
 192     for (y = 0; y < im->height; ++y) {
 193         for (x = 0; x < im->height; ++x) {
 194             gchar *c = &im->data[di + x * im->bits_per_pixel / 8];
 195             gchar t;
 196
 197             switch (im->bits_per_pixel) {
 198             case 32:
 199                 t = c[2];
 200                 c[2] = c[3];
 201                 c[3] = t;
 202             case 16:
 203                 t = c[0];
 204                 c[0] = c[1];
 205                 c[1] = t;
 206             case 8:
 207                 break;
 208             default:
 209                 g_warning("your bit depth is currently unhandled");
 210             }
 211         }
 212         di += im->bytes_per_line;
 213     }
 214
 215     if (im->byte_order == LSBFirst)
 216         im->byte_order = MSBFirst;
 217     else
 218         im->byte_order = LSBFirst;
 219 }
 220
 221 void RrIncreaseDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 222 {
 223     gint r, g, b;
 224     gint x,y;
 225     RrPixel32 *p32 = (RrPixel32 *) im->data;
 226     RrPixel16 *p16 = (RrPixel16 *) im->data;
 227     guchar *p8 = (guchar *)im->data;
 228
 229     if (im->byte_order != LSBFirst)
 230         swap_byte_order(im);
 231
 232     switch (im->bits_per_pixel) {
 233     case 32:
 234         for (y = 0; y < im->height; y++) {
 235             for (x = 0; x < im->width; x++) {
 236                 r = (p32[x] >> RrRedOffset(inst)) & 0xff;
 237                 g = (p32[x] >> RrGreenOffset(inst)) & 0xff;
 238                 b = (p32[x] >> RrBlueOffset(inst)) & 0xff;
 239                 data[x] = (r << RrDefaultRedOffset)
 240                     + (g << RrDefaultGreenOffset)
 241                     + (b << RrDefaultBlueOffset)
 242                     + (0xff << RrDefaultAlphaOffset);
 243             }
 244             data += im->width;
 245             p32 += im->bytes_per_line/4;
 246         }
 247         break;
 248     case 16:
 249         for (y = 0; y < im->height; y++) {
 250             for (x = 0; x < im->width; x++) {
 251                 r = (p16[x] & RrRedMask(inst)) >>
 252                     RrRedOffset(inst) <<
 253                     RrRedShift(inst);
 254                 g = (p16[x] & RrGreenMask(inst)) >>
 255                     RrGreenOffset(inst) <<
 256                     RrGreenShift(inst);
 257                 b = (p16[x] & RrBlueMask(inst)) >>
 258                     RrBlueOffset(inst) <<
 259                     RrBlueShift(inst);
 260                 data[x] = (r << RrDefaultRedOffset)
 261                     + (g << RrDefaultGreenOffset)
 262                     + (b << RrDefaultBlueOffset)
 263                     + (0xff << RrDefaultAlphaOffset);
 264             }
 265             data += im->width;
 266             p16 += im->bytes_per_line/2;
 267         }
 268         break;
 269     case 8:
 270         g_warning("this image bit depth is currently unhandled");
 271         break;
 272     case 1:
 273         for (y = 0; y < im->height; y++) {
 274             for (x = 0; x < im->width; x++) {
 275                 if (!(((p8[x / 8]) >> (x % 8)) & 0x1))
 276                     data[x] = 0xff << RrDefaultAlphaOffset; /* black */
 277                 else
 278                     data[x] = 0xffffffff; /* white */
 279             }
 280             data += im->width;
 281             p8 += im->bytes_per_line;
 282         }
 283         break;
 284     default:
 285         g_warning("this image bit depth is currently unhandled");
 286     }
 287 }
 288
 289 gint RrColorRed(const RrColor *c)
 290 {
 291     return c->r;
 292 }
 293
 294 gint RrColorGreen(const RrColor *c)
 295 {
 296     return c->g;
 297 }
 298
 299 gint RrColorBlue(const RrColor *c)
 300 {
 301     return c->b;
 302 }
 303
 304 gulong RrColorPixel(const RrColor *c)
 305 {
 306     return c->pixel;
 307 }
 308
 309 GC RrColorGC(RrColor *c)
 310 {
 311     if (!c->gc)
 312         RrColorAllocateGC(c);
 313     return c->gc;
 314 }