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

   1 // -*- mode: C; indent-tabs-mode: nil; -*-
   2
   3 #include "../config.h"
   4 #include "color.h"
   5 #include "display.h"
   6 #include "screeninfo.h"
   7
   8 #ifdef HAVE_STDLIB_H
   9 # include <stdlib.h>
  10 #endif
  11
  12 static Bool cleancache = False;
  13 static PyObject *colorcache;
  14
  15 // global color allocator/deallocator
  16 typedef struct RGB {
  17   PyObject_HEAD
  18   int screen;
  19   int r, g, b;
  20 } RGB;
  21
  22 static void rgb_dealloc(PyObject* self)
  23 {
  24   PyObject_Del(self);
  25 }
  26
  27 static int rgb_compare(PyObject *py1, PyObject *py2)
  28 {
  29   long result;
  30   unsigned long p1, p2;
  31   RGB *r1, *r2;
  32
  33   r1 = (RGB*) r1;
  34   r2 = (RGB*) r2;
  35   p1 = (r1->screen << 24 | r1->r << 16 | r1->g << 8 | r1->b) & 0x00ffffff;
  36   p2 = (r2->screen << 24 | r2->r << 16 | r2->g << 8 | r2->b) & 0x00ffffff;
  37
  38   if (p1 < p2)
  39     result = -1;
  40   else if (p1 > p2)
  41     result = 1;
  42   else
  43     result = 0;
  44   return result;
  45 }
  46
  47 static PyTypeObject RGB_Type = {
  48   PyObject_HEAD_INIT(NULL)
  49   0,
  50   "RGB",
  51   sizeof(RGB),
  52   0,
  53   rgb_dealloc, /*tp_dealloc*/
  54   0,          /*tp_print*/
  55   0,          /*tp_getattr*/
  56   0,          /*tp_setattr*/
  57   rgb_compare,          /*tp_compare*/
  58   0,          /*tp_repr*/
  59   0,          /*tp_as_number*/
  60   0,          /*tp_as_sequence*/
  61   0,          /*tp_as_mapping*/
  62   0,          /*tp_hash */
  63 };
  64
  65 static PyObject *RGB_New(int screen, int r, int g, int b) {
  66   RGB *self = (RGB*) PyObject_New(RGB, &RGB_Type);
  67   self->screen = screen;
  68   self->r = r;
  69   self->g = g;
  70   self->b = b;
  71   return (PyObject*)self;
  72 }
  73
  74 typedef struct PixelRef {
  75   unsigned long p;
  76   unsigned int count;
  77 } PixelRef;
  78
  79 static PixelRef *PixelRef_New(unsigned long p) {
  80   PixelRef* self = malloc(sizeof(PixelRef));
  81   self->p = p;
  82   self->count = 1;
  83   return self;
  84 }
  85
  86 static void OtkColor_ParseColorName(OtkColor *self) {
  87   XColor xcol;
  88
  89   if (!self->colorname) {
  90     fprintf(stderr, "OtkColor: empty colorname, cannot parse (using black)\n");
  91     OtkColor_SetRGB(self, 0, 0, 0);
  92   }
  93
  94   // get rgb values from colorname
  95   xcol.red = 0;
  96   xcol.green = 0;
  97   xcol.blue = 0;
  98   xcol.pixel = 0;
  99
 100   if (!XParseColor(OBDisplay->display, self->colormap,
 101                    PyString_AsString(self->colorname), &xcol)) {
 102     fprintf(stderr, "BColor::allocate: color parse error: \"%s\"\n",
 103             PyString_AsString(self->colorname));
 104     OtkColor_SetRGB(self, 0, 0, 0);
 105     return;
 106   }
 107
 108   OtkColor_SetRGB(self, xcol.red >> 8, xcol.green >> 8, xcol.blue >> 8);
 109 }
 110
 111 static void OtkColor_DoCacheCleanup() {
 112   unsigned long *pixels;
 113   int i;
 114   unsigned int count;
 115   PyObject *rgb, *pixref;
 116   int ppos;
 117
 118   // ### TODO - support multiple displays!
 119   if (!PyDict_Size(colorcache)) {
 120     // nothing to do
 121     return;
 122   }
 123
 124   pixels = malloc(sizeof(unsigned long) * PyDict_Size(colorcache));
 125
 126   for (i = 0; i < ScreenCount(OBDisplay->display); i++) {
 127     count = 0;
 128     ppos = 0;
 129
 130     while (PyDict_Next(colorcache, &ppos, &rgb, &pixref)) {
 131       if (((PixelRef*)pixref)->count != 0 || ((RGB*)rgb)->screen != i)
 132         continue;
 133
 134       pixels[count++] = ((PixelRef*)pixref)->p;
 135       PyDict_DelItem(colorcache, rgb);
 136       free(pixref); // not really a PyObject, it just pretends
 137       --ppos; // back up one in the iteration
 138     }
 139
 140     if (count > 0)
 141       XFreeColors(OBDisplay->display,
 142                   OtkDisplay_ScreenInfo(OBDisplay, i)->colormap,
 143                   pixels, count, 0);
 144   }
 145
 146   free(pixels);
 147   cleancache = False;
 148 }
 149
 150 static void OtkColor_Allocate(OtkColor *self) {
 151   XColor xcol;
 152   PyObject *rgb, *pixref;
 153
 154   if (!OtkColor_IsValid(self)) {
 155     if (!self->colorname) {
 156       fprintf(stderr, "BColor: cannot allocate invalid color (using black)\n");
 157       OtkColor_SetRGB(self, 0, 0, 0);
 158     } else {
 159       OtkColor_ParseColorName(self);
 160     }
 161   }
 162
 163   // see if we have allocated this color before
 164   rgb = RGB_New(self->screen, self->red, self->green, self->blue);
 165   pixref = PyDict_GetItem((PyObject*)colorcache, rgb);
 166   if (pixref) {
 167     // found
 168     self->allocated = True;
 169     self->pixel = ((PixelRef*)pixref)->p;
 170     ((PixelRef*)pixref)->count++;
 171     return;
 172   }
 173
 174   // allocate color from rgb values
 175   xcol.red =   self->red   | self->red   << 8;
 176   xcol.green = self->green | self->green << 8;
 177   xcol.blue =  self->blue  | self->blue  << 8;
 178   xcol.pixel = 0;
 179
 180   if (!XAllocColor(OBDisplay->display, self->colormap, &xcol)) {
 181     fprintf(stderr, "BColor::allocate: color alloc error: rgb:%x/%x/%x\n",
 182             self->red, self->green, self->blue);
 183     xcol.pixel = 0;
 184   }
 185
 186   self->pixel = xcol.pixel;
 187   self->allocated = True;
 188
 189   PyDict_SetItem(colorcache, rgb, (PyObject*)PixelRef_New(self->pixel));
 190
 191   if (cleancache)
 192     OtkColor_DoCacheCleanup();
 193 }
 194
 195 static void OtkColor_Deallocate(OtkColor *self) {
 196   PyObject *rgb, *pixref;
 197
 198   if (!self->allocated)
 199     return;
 200
 201   rgb = RGB_New(self->screen, self->red, self->green, self->blue);
 202   pixref = PyDict_GetItem(colorcache, rgb);
 203   if (pixref) {
 204     if (((PixelRef*)pixref)->count >= 1)
 205       ((PixelRef*)pixref)->count--;
 206   }
 207
 208   if (cleancache)
 209     OtkColor_DoCacheCleanup();
 210
 211   self->allocated = False;
 212 }
 213
 214
 215 OtkColor *OtkColor_New(int screen)
 216 {
 217   OtkColor *self = malloc(sizeof(OtkColor));
 218
 219   self->allocated = False;
 220   self->red = -1;
 221   self->green = -1;
 222   self->blue = -1;
 223   self->pixel = 0;
 224   self->screen = screen;
 225   self->colorname = NULL;
 226   self->colormap = OtkDisplay_ScreenInfo(OBDisplay, self->screen)->colormap;
 227
 228   return self;
 229 }
 230
 231 OtkColor *OtkColor_FromRGB(int r, int g, int b, int screen)
 232 {
 233   OtkColor *self = malloc(sizeof(OtkColor));
 234
 235   self->allocated = False;
 236   self->red = r;
 237   self->green = g;
 238   self->blue = b;
 239   self->pixel = 0;
 240   self->screen = screen;
 241   self->colorname = NULL;
 242   self->colormap = OtkDisplay_ScreenInfo(OBDisplay, self->screen)->colormap;
 243
 244   return self;
 245 }
 246
 247 OtkColor *OtkColor_FromName(const char *name, int screen)
 248 {
 249   OtkColor *self = malloc(sizeof(OtkColor));
 250
 251   self->allocated = False;
 252   self->red = -1;
 253   self->green = -1;
 254   self->blue = -1;
 255   self->pixel = 0;
 256   self->screen = screen;
 257   self->colorname = PyString_FromString(name);
 258   self->colormap = OtkDisplay_ScreenInfo(OBDisplay, self->screen)->colormap;
 259
 260   return self;
 261 }
 262
 263 void OtkColor_Destroy(OtkColor *self)
 264 {
 265   if (self->colorname)
 266     Py_DECREF(self->colorname);
 267   free(self);
 268 }
 269
 270 void OtkColor_SetRGB(OtkColor *self, int r, int g, int b)
 271 {
 272   OtkColor_Deallocate(self);
 273   self->red = r;
 274   self->green = g;
 275   self->blue = b;
 276 }
 277
 278 void OtkColor_SetScreen(OtkColor *self, int screen)
 279 {
 280   if (screen == self->screen) {
 281     // nothing to do
 282     return;
 283   }
 284
 285   Otk_Deallocate(self);
 286
 287   self->colormap = OtkDisplay_ScreenInfo(OBDisplay, self->screen)->colormap;
 288
 289   self->screen = screen;
 290
 291   if (self->colorname)
 292     parseColorName();
 293 }
 294
 295 Bool OtkColor_IsValid(OtkColor *self)
 296 {
 297   return self->red != -1 && self->blue != -1 && self->green != -1;
 298 }
 299
 300 unsigned long OtkColor_Pixel(OtkColor *self)
 301 {
 302   if (!self->allocated)
 303     OtkColor_Allocate(self);
 304   return self->pixel;
 305 }
 306
 307 void OtkColor_InitializeCache()
 308 {
 309   colorcache = PyDict_New();
 310 }
 311
 312 void OtkColor_DestroyCache()
 313 {
 314   Py_DECREF(colorcache);
 315   colorcache = NULL;
 316 }
 317
 318 void OtkColor_CleanupColorCache()
 319 {
 320   cleancache = True;
 321 }