obrender/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) 2006        Mikael Magnusson
   5    Copyright (c) 2003-2007   Dana Jansens
   6    Copyright (c) 2003        Derek Foreman
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    See the COPYING file for a copy of the GNU General Public License.
  19 */
  20
  21 #include "render.h"
  22 #include "color.h"
  23 #include "instance.h"
  24
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <string.h>
  28
  29 void RrColorAllocateGC(RrColor *in)
  30 {
  31     XGCValues gcv;
  32
  33     gcv.foreground = in->pixel;
  34     gcv.cap_style = CapProjecting;
  35     in->gc = XCreateGC(RrDisplay(in->inst),
  36                        RrRootWindow(in->inst),
  37                        GCForeground | GCCapStyle, &gcv);
  38 }
  39
  40 RrColor *RrColorParse(const RrInstance *inst, gchar *colorname)
  41 {
  42     XColor xcol;
  43
  44     g_assert(colorname != NULL);
  45     /* get rgb values from colorname */
  46
  47     xcol.red = 0;
  48     xcol.green = 0;
  49     xcol.blue = 0;
  50     xcol.pixel = 0;
  51     if (!XParseColor(RrDisplay(inst), RrColormap(inst), colorname, &xcol)) {
  52         g_message("Unable to parse color '%s'", colorname);
  53         return NULL;
  54     }
  55     return RrColorNew(inst, xcol.red >> 8, xcol.green >> 8, xcol.blue >> 8);
  56 }
  57
  58 /*#define NO_COLOR_CACHE*/
  59 #ifdef DEBUG
  60 gint id;
  61 #endif
  62
  63 RrColor *RrColorNew(const RrInstance *inst, gint r, gint g, gint b)
  64 {
  65     /* this should be replaced with something far cooler */
  66     RrColor *out = NULL;
  67     XColor xcol;
  68     gint key;
  69
  70     g_assert(r >= 0 && r < 256);
  71     g_assert(g >= 0 && g < 256);
  72     g_assert(b >= 0 && b < 256);
  73
  74     key = (r << 24) + (g << 16) + (b << 8);
  75 #ifndef NO_COLOR_CACHE
  76     if ((out = g_hash_table_lookup(RrColorHash(inst), &key))) {
  77         out->refcount++;
  78     } else {
  79 #endif
  80         xcol.red = (r << 8) | r;
  81         xcol.green = (g << 8) | g;
  82         xcol.blue = (b << 8) | b;
  83         if (XAllocColor(RrDisplay(inst), RrColormap(inst), &xcol)) {
  84             out = g_slice_new(RrColor);
  85             out->inst = inst;
  86             out->r = xcol.red >> 8;
  87             out->g = xcol.green >> 8;
  88             out->b = xcol.blue >> 8;
  89             out->gc = None;
  90             out->pixel = xcol.pixel;
  91             out->key = key;
  92             out->refcount = 1;
  93 #ifdef DEBUG
  94             out->id = id++;
  95 #endif
  96 #ifndef NO_COLOR_CACHE
  97             g_hash_table_insert(RrColorHash(inst), &out->key, out);
  98         }
  99 #endif
 100     }
 101     return out;
 102 }
 103
 104 RrColor *RrColorCopy(RrColor* c)
 105 {
 106     return RrColorNew(c->inst, c->r, c->g, c->b);
 107 }
 108
 109 void RrColorFree(RrColor *c)
 110 {
 111     if (c) {
 112         if (--c->refcount < 1) {
 113 #ifndef NO_COLOR_CACHE
 114             g_assert(g_hash_table_lookup(RrColorHash(c->inst), &c->key));
 115             g_hash_table_remove(RrColorHash(c->inst), &c->key);
 116 #endif
 117             if (c->pixel) XFreeColors(RrDisplay(c->inst), RrColormap(c->inst),
 118                                       &c->pixel, 1, 0);
 119             if (c->gc) XFreeGC(RrDisplay(c->inst), c->gc);
 120             g_slice_free(RrColor, c);
 121         }
 122     }
 123 }
 124
 125 void RrReduceDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 126 {
 127     gint r, g, b;
 128     gint x,y;
 129     gint ro = RrRedOffset(inst);
 130     gint bo = RrBlueOffset(inst);
 131     gint go = RrGreenOffset(inst);
 132     gint rs = RrRedShift(inst);
 133     gint bs = RrBlueShift(inst);
 134     gint gs = RrGreenShift(inst);
 135     RrPixel32 *p32 = (RrPixel32 *) im->data;
 136     RrPixel16 *p16 = (RrPixel16 *) im->data;
 137     RrPixel8  *p8  = (RrPixel8 *)  im->data;
 138     switch (im->bits_per_pixel) {
 139     case 32:
 140         if ((ro != RrDefaultRedOffset) ||
 141             (bo != RrDefaultBlueOffset) ||
 142             (go != RrDefaultGreenOffset)) {
 143             for (y = 0; y < im->height; y++) {
 144                 for (x = 0; x < im->width; x++) {
 145                     r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 146                     g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 147                     b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 148                     p32[x] = (r << ro) + (g << go) + (b << bo);
 149                 }
 150                 data += im->width;
 151                 p32 += im->width;
 152             }
 153         } else im->data = (gchar*) data;
 154         break;
 155     case 24:
 156     {
 157         /* reverse the ordering, shifting left 16bit should be the first byte
 158            out of three, etc */
 159         const guint roff = (16 - ro) / 8;
 160         const guint goff = (16 - go) / 8;
 161         const guint boff = (16 - bo) / 8;
 162         gint outx;
 163         for (y = 0; y < im->height; y++) {
 164             for (x = 0, outx = 0; x < im->width; x++, outx += 3) {
 165                 r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 166                 g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 167                 b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 168                 p8[outx+roff] = r;
 169                 p8[outx+goff] = g;
 170                 p8[outx+boff] = b;
 171             }
 172             data += im->width;
 173             p8 += im->bytes_per_line;
 174         }
 175         break;
 176     }
 177     case 16:
 178         for (y = 0; y < im->height; y++) {
 179             for (x = 0; x < im->width; x++) {
 180                 r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 181                 r = r >> rs;
 182                 g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 183                 g = g >> gs;
 184                 b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 185                 b = b >> bs;
 186                 p16[x] = (r << ro) + (g << go) + (b << bo);
 187             }
 188             data += im->width;
 189             p16 += im->bytes_per_line/2;
 190         }
 191         break;
 192     case 8:
 193         if (RrVisual(inst)->class == TrueColor) {
 194             for (y = 0; y < im->height; y++) {
 195                 for (x = 0; x < im->width; x++) {
 196                     r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 197                     r = r >> rs;
 198                     g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 199                     g = g >> gs;
 200                     b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 201                     b = b >> bs;
 202                     p8[x] = (r << ro) + (g << go) + (b << bo);
 203                 }
 204                 data += im->width;
 205                 p8 += im->bytes_per_line;
 206             }
 207         } else {
 208             for (y = 0; y < im->height; y++) {
 209                 for (x = 0; x < im->width; x++) {
 210                     p8[x] = RrPickColor(inst,
 211                                         data[x] >> RrDefaultRedOffset,
 212                                         data[x] >> RrDefaultGreenOffset,
 213                                         data[x] >> RrDefaultBlueOffset)->pixel;
 214                 }
 215                 data += im->width;
 216                 p8 += im->bytes_per_line;
 217             }
 218         }
 219         break;
 220     default:
 221         g_error("This image bit depth (%i) is currently unhandled", im->bits_per_pixel);
 222
 223     }
 224 }
 225
 226 XColor *RrPickColor(const RrInstance *inst, gint r, gint g, gint b)
 227 {
 228   r = (r & 0xff) >> (8-RrPseudoBPC(inst));
 229   g = (g & 0xff) >> (8-RrPseudoBPC(inst));
 230   b = (b & 0xff) >> (8-RrPseudoBPC(inst));
 231   return &RrPseudoColors(inst)[(r << (2*RrPseudoBPC(inst))) +
 232                                (g << (1*RrPseudoBPC(inst))) +
 233                                b];
 234 }
 235
 236 static void swap_byte_order(XImage *im)
 237 {
 238     gint x, y, di;
 239
 240     di = 0;
 241     for (y = 0; y < im->height; ++y) {
 242         for (x = 0; x < im->width; ++x) {
 243             gchar *c = &im->data[di + x * im->bits_per_pixel / 8];
 244             gchar t;
 245
 246             switch (im->bits_per_pixel) {
 247             case 32:
 248                 t = c[2];
 249                 c[2] = c[3];
 250                 c[3] = t;
 251             case 16:
 252                 t = c[0];
 253                 c[0] = c[1];
 254                 c[1] = t;
 255             case 8:
 256             case 1:
 257                 break;
 258             default:
 259                 g_error("Your bit depth (%i) is currently unhandled",
 260                         im->bits_per_pixel);
 261             }
 262         }
 263         di += im->bytes_per_line;
 264     }
 265
 266     if (im->byte_order == LSBFirst)
 267         im->byte_order = MSBFirst;
 268     else
 269         im->byte_order = LSBFirst;
 270 }
 271
 272 void RrIncreaseDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 273 {
 274     gint r, g, b;
 275     gint x,y;
 276     RrPixel32 *p32 = (RrPixel32 *) im->data;
 277     RrPixel16 *p16 = (RrPixel16 *) im->data;
 278     guchar *p8 = (guchar *)im->data;
 279
 280     if (im->byte_order != LSBFirst)
 281         swap_byte_order(im);
 282
 283     switch (im->bits_per_pixel) {
 284     case 32:
 285         for (y = 0; y < im->height; y++) {
 286             for (x = 0; x < im->width; x++) {
 287                 r = (p32[x] >> RrRedOffset(inst)) & 0xff;
 288                 g = (p32[x] >> RrGreenOffset(inst)) & 0xff;
 289                 b = (p32[x] >> RrBlueOffset(inst)) & 0xff;
 290                 data[x] = (r << RrDefaultRedOffset)
 291                     + (g << RrDefaultGreenOffset)
 292                     + (b << RrDefaultBlueOffset)
 293                     + (0xff << RrDefaultAlphaOffset);
 294             }
 295             data += im->width;
 296             p32 += im->bytes_per_line/4;
 297         }
 298         break;
 299     case 16:
 300         for (y = 0; y < im->height; y++) {
 301             for (x = 0; x < im->width; x++) {
 302                 r = (p16[x] & RrRedMask(inst)) >>
 303                     RrRedOffset(inst) <<
 304                     RrRedShift(inst);
 305                 g = (p16[x] & RrGreenMask(inst)) >>
 306                     RrGreenOffset(inst) <<
 307                     RrGreenShift(inst);
 308                 b = (p16[x] & RrBlueMask(inst)) >>
 309                     RrBlueOffset(inst) <<
 310                     RrBlueShift(inst);
 311                 data[x] = (r << RrDefaultRedOffset)
 312                     + (g << RrDefaultGreenOffset)
 313                     + (b << RrDefaultBlueOffset)
 314                     + (0xff << RrDefaultAlphaOffset);
 315             }
 316             data += im->width;
 317             p16 += im->bytes_per_line/2;
 318         }
 319         break;
 320     case 8:
 321         g_error("This image bit depth (%i) is currently unhandled", 8);
 322         break;
 323     case 1:
 324         for (y = 0; y < im->height; y++) {
 325             for (x = 0; x < im->width; x++) {
 326                 if (!(((p8[x / 8]) >> (x % 8)) & 0x1))
 327                     data[x] = 0xff << RrDefaultAlphaOffset; /* black */
 328                 else
 329                     data[x] = 0xffffffff; /* white */
 330             }
 331             data += im->width;
 332             p8 += im->bytes_per_line;
 333         }
 334         break;
 335     default:
 336         g_error("This image bit depth (%i) is currently unhandled",
 337                 im->bits_per_pixel);
 338     }
 339 }
 340
 341 gint RrColorRed(const RrColor *c)
 342 {
 343     return c->r;
 344 }
 345
 346 gint RrColorGreen(const RrColor *c)
 347 {
 348     return c->g;
 349 }
 350
 351 gint RrColorBlue(const RrColor *c)
 352 {
 353     return c->b;
 354 }
 355
 356 gulong RrColorPixel(const RrColor *c)
 357 {
 358     return c->pixel;
 359 }
 360
 361 GC RrColorGC(RrColor *c)
 362 {
 363     if (!c->gc)
 364         RrColorAllocateGC(c);
 365     return c->gc;
 366 }