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) 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_new(RrColor, 1);
  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 void RrColorFree(RrColor *c)
 105 {
 106     if (c) {
 107         if (--c->refcount < 1) {
 108 #ifndef NO_COLOR_CACHE
 109             g_assert(g_hash_table_lookup(RrColorHash(c->inst), &c->key));
 110             g_hash_table_remove(RrColorHash(c->inst), &c->key);
 111 #endif
 112             if (c->pixel) XFreeColors(RrDisplay(c->inst), RrColormap(c->inst),
 113                                       &c->pixel, 1, 0);
 114             if (c->gc) XFreeGC(RrDisplay(c->inst), c->gc);
 115             g_free(c);
 116         }
 117     }
 118 }
 119
 120 void RrReduceDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 121 {
 122     gint r, g, b;
 123     gint x,y;
 124     RrPixel32 *p32 = (RrPixel32 *) im->data;
 125     RrPixel16 *p16 = (RrPixel16 *) im->data;
 126     RrPixel8  *p8  = (RrPixel8 *)  im->data;
 127     switch (im->bits_per_pixel) {
 128     case 32:
 129         if ((RrRedOffset(inst) != RrDefaultRedOffset) ||
 130             (RrBlueOffset(inst) != RrDefaultBlueOffset) ||
 131             (RrGreenOffset(inst) != RrDefaultGreenOffset)) {
 132             for (y = 0; y < im->height; y++) {
 133                 for (x = 0; x < im->width; x++) {
 134                     r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 135                     g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 136                     b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 137                     p32[x] = (r << RrRedOffset(inst))
 138                            + (g << RrGreenOffset(inst))
 139                            + (b << RrBlueOffset(inst));
 140                 }
 141                 data += im->width;
 142                 p32 += im->width;
 143             }
 144         } else im->data = (gchar*) data;
 145         break;
 146     case 24:
 147     {
 148         /* reverse the ordering, shifting left 16bit should be the first byte
 149            out of three, etc */
 150         const guint roff = (16 - RrRedOffset(inst)) / 8;
 151         const guint goff = (16 - RrGreenOffset(inst)) / 8;
 152         const guint boff = (16 - RrBlueOffset(inst)) / 8;
 153         gint outx;
 154         for (y = 0; y < im->height; y++) {
 155             for (x = 0, outx = 0; x < im->width; x++, outx += 3) {
 156                 r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 157                 g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 158                 b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 159                 p8[outx+roff] = r;
 160                 p8[outx+goff] = g;
 161                 p8[outx+boff] = b;
 162             }
 163             data += im->width;
 164             p8 += im->bytes_per_line;
 165         }
 166         break;
 167     }
 168     case 16:
 169         for (y = 0; y < im->height; y++) {
 170             for (x = 0; x < im->width; x++) {
 171                 r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 172                 r = r >> RrRedShift(inst);
 173                 g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 174                 g = g >> RrGreenShift(inst);
 175                 b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 176                 b = b >> RrBlueShift(inst);
 177                 p16[x] = (r << RrRedOffset(inst))
 178                        + (g << RrGreenOffset(inst))
 179                        + (b << RrBlueOffset(inst));
 180             }
 181             data += im->width;
 182             p16 += im->bytes_per_line/2;
 183         }
 184         break;
 185     case 8:
 186         if (RrVisual(inst)->class == TrueColor) {
 187             for (y = 0; y < im->height; y++) {
 188                 for (x = 0; x < im->width; x++) {
 189                     r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 190                     r = r >> RrRedShift(inst);
 191                     g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 192                     g = g >> RrGreenShift(inst);
 193                     b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 194                     b = b >> RrBlueShift(inst);
 195                     p8[x] = (r << RrRedOffset(inst))
 196                         + (g << RrGreenOffset(inst))
 197                         + (b << RrBlueOffset(inst));
 198                 }
 199                 data += im->width;
 200                 p8 += im->bytes_per_line;
 201             }
 202         } else {
 203             for (y = 0; y < im->height; y++) {
 204                 for (x = 0; x < im->width; x++) {
 205                     p8[x] = RrPickColor(inst,
 206                                         data[x] >> RrDefaultRedOffset,
 207                                         data[x] >> RrDefaultGreenOffset,
 208                                         data[x] >> RrDefaultBlueOffset)->pixel;
 209                 }
 210                 data += im->width;
 211                 p8 += im->bytes_per_line;
 212             }
 213         }
 214         break;
 215     default:
 216         g_error("This image bit depth (%i) is currently unhandled", im->bits_per_pixel);
 217
 218     }
 219 }
 220
 221 XColor *RrPickColor(const RrInstance *inst, gint r, gint g, gint b)
 222 {
 223   r = (r & 0xff) >> (8-RrPseudoBPC(inst));
 224   g = (g & 0xff) >> (8-RrPseudoBPC(inst));
 225   b = (b & 0xff) >> (8-RrPseudoBPC(inst));
 226   return &RrPseudoColors(inst)[(r << (2*RrPseudoBPC(inst))) +
 227                                (g << (1*RrPseudoBPC(inst))) +
 228                                b];
 229 }
 230
 231 static void swap_byte_order(XImage *im)
 232 {
 233     gint x, y, di;
 234
 235     di = 0;
 236     for (y = 0; y < im->height; ++y) {
 237         for (x = 0; x < im->height; ++x) {
 238             gchar *c = &im->data[di + x * im->bits_per_pixel / 8];
 239             gchar t;
 240
 241             switch (im->bits_per_pixel) {
 242             case 32:
 243                 t = c[2];
 244                 c[2] = c[3];
 245                 c[3] = t;
 246             case 16:
 247                 t = c[0];
 248                 c[0] = c[1];
 249                 c[1] = t;
 250             case 8:
 251             case 1:
 252                 break;
 253             default:
 254                 g_error("Your bit depth (%i) is currently unhandled",
 255                         im->bits_per_pixel);
 256             }
 257         }
 258         di += im->bytes_per_line;
 259     }
 260
 261     if (im->byte_order == LSBFirst)
 262         im->byte_order = MSBFirst;
 263     else
 264         im->byte_order = LSBFirst;
 265 }
 266
 267 void RrIncreaseDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 268 {
 269     gint r, g, b;
 270     gint x,y;
 271     RrPixel32 *p32 = (RrPixel32 *) im->data;
 272     RrPixel16 *p16 = (RrPixel16 *) im->data;
 273     guchar *p8 = (guchar *)im->data;
 274
 275     if (im->byte_order != LSBFirst)
 276         swap_byte_order(im);
 277
 278     switch (im->bits_per_pixel) {
 279     case 32:
 280         for (y = 0; y < im->height; y++) {
 281             for (x = 0; x < im->width; x++) {
 282                 r = (p32[x] >> RrRedOffset(inst)) & 0xff;
 283                 g = (p32[x] >> RrGreenOffset(inst)) & 0xff;
 284                 b = (p32[x] >> RrBlueOffset(inst)) & 0xff;
 285                 data[x] = (r << RrDefaultRedOffset)
 286                     + (g << RrDefaultGreenOffset)
 287                     + (b << RrDefaultBlueOffset)
 288                     + (0xff << RrDefaultAlphaOffset);
 289             }
 290             data += im->width;
 291             p32 += im->bytes_per_line/4;
 292         }
 293         break;
 294     case 16:
 295         for (y = 0; y < im->height; y++) {
 296             for (x = 0; x < im->width; x++) {
 297                 r = (p16[x] & RrRedMask(inst)) >>
 298                     RrRedOffset(inst) <<
 299                     RrRedShift(inst);
 300                 g = (p16[x] & RrGreenMask(inst)) >>
 301                     RrGreenOffset(inst) <<
 302                     RrGreenShift(inst);
 303                 b = (p16[x] & RrBlueMask(inst)) >>
 304                     RrBlueOffset(inst) <<
 305                     RrBlueShift(inst);
 306                 data[x] = (r << RrDefaultRedOffset)
 307                     + (g << RrDefaultGreenOffset)
 308                     + (b << RrDefaultBlueOffset)
 309                     + (0xff << RrDefaultAlphaOffset);
 310             }
 311             data += im->width;
 312             p16 += im->bytes_per_line/2;
 313         }
 314         break;
 315     case 8:
 316         g_error("This image bit depth (%i) is currently unhandled", 8);
 317         break;
 318     case 1:
 319         for (y = 0; y < im->height; y++) {
 320             for (x = 0; x < im->width; x++) {
 321                 if (!(((p8[x / 8]) >> (x % 8)) & 0x1))
 322                     data[x] = 0xff << RrDefaultAlphaOffset; /* black */
 323                 else
 324                     data[x] = 0xffffffff; /* white */
 325             }
 326             data += im->width;
 327             p8 += im->bytes_per_line;
 328         }
 329         break;
 330     default:
 331         g_error("This image bit depth (%i) is currently unhandled",
 332                 im->bits_per_pixel);
 333     }
 334 }
 335
 336 gint RrColorRed(const RrColor *c)
 337 {
 338     return c->r;
 339 }
 340
 341 gint RrColorGreen(const RrColor *c)
 342 {
 343     return c->g;
 344 }
 345
 346 gint RrColorBlue(const RrColor *c)
 347 {
 348     return c->b;
 349 }
 350
 351 gulong RrColorPixel(const RrColor *c)
 352 {
 353     return c->pixel;
 354 }
 355
 356 GC RrColorGC(RrColor *c)
 357 {
 358     if (!c->gc)
 359         RrColorAllocateGC(c);
 360     return c->gc;
 361 }