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 RrColor *RrColorNew(const RrInstance *inst, gint r, gint g, gint b)
  58 {
  59     /* this should be replaced with something far cooler */
  60     RrColor *out = NULL;
  61     XColor xcol;
  62     gint key;
  63
  64     key = (r << 24) + (g << 16) + (b << 8);
  65     if ((out = g_hash_table_lookup(RrColorHash(inst), &key))) {
  66         out->refcount++;
  67     } else {
  68         xcol.red = (r << 8) | r;
  69         xcol.green = (g << 8) | g;
  70         xcol.blue = (b << 8) | b;
  71         if (XAllocColor(RrDisplay(inst), RrColormap(inst), &xcol)) {
  72             out = g_new(RrColor, 1);
  73             out->inst = inst;
  74             out->r = xcol.red >> 8;
  75             out->g = xcol.green >> 8;
  76             out->b = xcol.blue >> 8;
  77             out->gc = None;
  78             out->pixel = xcol.pixel;
  79             out->key = key;
  80             out->refcount = 1;
  81             g_hash_table_replace(RrColorHash(inst), &out->key, out);
  82         }
  83     }
  84     return out;
  85 }
  86
  87 void RrColorFree(RrColor *c)
  88 {
  89     if (c) {
  90         if (--c->refcount < 1) {
  91             g_hash_table_remove(RrColorHash(c->inst), &c->key);
  92             if (c->pixel) XFreeColors(RrDisplay(c->inst), RrColormap(c->inst),
  93                                       &c->pixel, 1, 0);
  94             if (c->gc) XFreeGC(RrDisplay(c->inst), c->gc);
  95             g_free(c);
  96         }
  97     }
  98 }
  99
 100 void RrReduceDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 101 {
 102     int r, g, b;
 103     int x,y;
 104     RrPixel32 *p32 = (RrPixel32 *) im->data;
 105     RrPixel16 *p16 = (RrPixel16 *) im->data;
 106     unsigned char *p8 = (unsigned char *)im->data;
 107     switch (im->bits_per_pixel) {
 108     case 32:
 109         if ((RrRedOffset(inst) != RrDefaultRedOffset) ||
 110             (RrBlueOffset(inst) != RrDefaultBlueOffset) ||
 111             (RrGreenOffset(inst) != RrDefaultGreenOffset)) {
 112             for (y = 0; y < im->height; y++) {
 113                 for (x = 0; x < im->width; x++) {
 114                     r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 115                     g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 116                     b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 117                     p32[x] = (r << RrRedOffset(inst))
 118                            + (g << RrGreenOffset(inst))
 119                            + (b << RrBlueOffset(inst));
 120                 }
 121                 data += im->width;
 122                 p32 += im->width;
 123             }
 124         } else im->data = (char*) data;
 125         break;
 126     case 16:
 127         for (y = 0; y < im->height; y++) {
 128             for (x = 0; x < im->width; x++) {
 129                 r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 130                 r = r >> RrRedShift(inst);
 131                 g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 132                 g = g >> RrGreenShift(inst);
 133                 b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 134                 b = b >> RrBlueShift(inst);
 135                 p16[x] = (r << RrRedOffset(inst))
 136                        + (g << RrGreenOffset(inst))
 137                        + (b << RrBlueOffset(inst));
 138             }
 139             data += im->width;
 140             p16 += im->bytes_per_line/2;
 141         }
 142     break;
 143     case 8:
 144         g_assert(RrVisual(inst)->class != TrueColor);
 145         for (y = 0; y < im->height; y++) {
 146             for (x = 0; x < im->width; x++) {
 147                 p8[x] = RrPickColor(inst,
 148                                     data[x] >> RrDefaultRedOffset,
 149                                     data[x] >> RrDefaultGreenOffset,
 150                                     data[x] >> RrDefaultBlueOffset)->pixel;
 151         }
 152         data += im->width;
 153         p8 += im->bytes_per_line;
 154   }
 155
 156     break;
 157     default:
 158         g_warning("your bit depth is currently unhandled\n");
 159     }
 160 }
 161
 162 XColor *RrPickColor(const RrInstance *inst, gint r, gint g, gint b)
 163 {
 164   r = (r & 0xff) >> (8-RrPseudoBPC(inst));
 165   g = (g & 0xff) >> (8-RrPseudoBPC(inst));
 166   b = (b & 0xff) >> (8-RrPseudoBPC(inst));
 167   return &RrPseudoColors(inst)[(r << (2*RrPseudoBPC(inst))) +
 168                                (g << (1*RrPseudoBPC(inst))) +
 169                                b];
 170 }
 171
 172 static void swap_byte_order(XImage *im)
 173 {
 174     int x, y, di;
 175
 176     di = 0;
 177     for (y = 0; y < im->height; ++y) {
 178         for (x = 0; x < im->height; ++x) {
 179             char *c = &im->data[di + x * im->bits_per_pixel / 8];
 180             char t;
 181
 182             switch (im->bits_per_pixel) {
 183             case 32:
 184                 t = c[2];
 185                 c[2] = c[3];
 186                 c[3] = t;
 187             case 16:
 188                 t = c[0];
 189                 c[0] = c[1];
 190                 c[1] = t;
 191             case 8:
 192                 break;
 193             default:
 194                 g_warning("your bit depth is currently unhandled");
 195             }
 196         }
 197         di += im->bytes_per_line;
 198     }
 199
 200     if (im->byte_order == LSBFirst)
 201         im->byte_order = MSBFirst;
 202     else
 203         im->byte_order = LSBFirst;
 204 }
 205
 206 void RrIncreaseDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 207 {
 208     int r, g, b;
 209     int x,y;
 210     RrPixel32 *p32 = (RrPixel32 *) im->data;
 211     RrPixel16 *p16 = (RrPixel16 *) im->data;
 212     unsigned char *p8 = (unsigned char *)im->data;
 213
 214     if (im->byte_order != LSBFirst)
 215         swap_byte_order(im);
 216
 217     switch (im->bits_per_pixel) {
 218     case 32:
 219         for (y = 0; y < im->height; y++) {
 220             for (x = 0; x < im->width; x++) {
 221                 r = (p32[x] >> RrRedOffset(inst)) & 0xff;
 222                 g = (p32[x] >> RrGreenOffset(inst)) & 0xff;
 223                 b = (p32[x] >> RrBlueOffset(inst)) & 0xff;
 224                 data[x] = (r << RrDefaultRedOffset)
 225                     + (g << RrDefaultGreenOffset)
 226                     + (b << RrDefaultBlueOffset)
 227                     + (0xff << RrDefaultAlphaOffset);
 228             }
 229             data += im->width;
 230             p32 += im->bytes_per_line/4;
 231         }
 232         break;
 233     case 16:
 234         for (y = 0; y < im->height; y++) {
 235             for (x = 0; x < im->width; x++) {
 236                 r = (p16[x] & RrRedMask(inst)) >>
 237                     RrRedOffset(inst) <<
 238                     RrRedShift(inst);
 239                 g = (p16[x] & RrGreenMask(inst)) >>
 240                     RrGreenOffset(inst) <<
 241                     RrGreenShift(inst);
 242                 b = (p16[x] & RrBlueMask(inst)) >>
 243                     RrBlueOffset(inst) <<
 244                     RrBlueShift(inst);
 245                 data[x] = (r << RrDefaultRedOffset)
 246                     + (g << RrDefaultGreenOffset)
 247                     + (b << RrDefaultBlueOffset)
 248                     + (0xff << RrDefaultAlphaOffset);
 249             }
 250             data += im->width;
 251             p16 += im->bytes_per_line/2;
 252         }
 253         break;
 254     case 8:
 255         g_warning("this image bit depth is currently unhandled");
 256         break;
 257     case 1:
 258         for (y = 0; y < im->height; y++) {
 259             for (x = 0; x < im->width; x++) {
 260                 if (!(((p8[x / 8]) >> (x % 8)) & 0x1))
 261                     data[x] = 0xff << RrDefaultAlphaOffset; /* black */
 262                 else
 263                     data[x] = 0xffffffff; /* white */
 264             }
 265             data += im->width;
 266             p8 += im->bytes_per_line;
 267         }
 268         break;
 269     default:
 270         g_warning("this image bit depth is currently unhandled");
 271     }
 272 }
 273
 274 int RrColorRed(const RrColor *c)
 275 {
 276     return c->r;
 277 }
 278
 279 int RrColorGreen(const RrColor *c)
 280 {
 281     return c->g;
 282 }
 283
 284 int RrColorBlue(const RrColor *c)
 285 {
 286     return c->b;
 287 }
 288
 289 gulong RrColorPixel(const RrColor *c)
 290 {
 291     return c->pixel;
 292 }
 293
 294 GC RrColorGC(RrColor *c)
 295 {
 296     if (!c->gc)
 297         RrColorAllocateGC(c);
 298     return c->gc;
 299 }